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I added functionality to get the RSSI, BER, and Cell Neighbor for reporting connection issues to M2X

mbedtls/source/rsa.c@12:0071cb144c7a, 2016-11-01 (annotated)

Committer:: JMF
Date:: Tue Nov 01 14:22:56 2016 +0000
Revision:: 12:0071cb144c7a

Adding mbedtls files

Who changed what in which revision?

User	Revision	Line number	New contents of line
JMF	12:0071cb144c7a	1	/*
JMF	12:0071cb144c7a	2	* The RSA public-key cryptosystem
JMF	12:0071cb144c7a	3	*
JMF	12:0071cb144c7a	4	* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
JMF	12:0071cb144c7a	5	* SPDX-License-Identifier: Apache-2.0
JMF	12:0071cb144c7a	6	*
JMF	12:0071cb144c7a	7	* Licensed under the Apache License, Version 2.0 (the "License"); you may
JMF	12:0071cb144c7a	8	* not use this file except in compliance with the License.
JMF	12:0071cb144c7a	9	* You may obtain a copy of the License at
JMF	12:0071cb144c7a	10	*
JMF	12:0071cb144c7a	11	* http://www.apache.org/licenses/LICENSE-2.0
JMF	12:0071cb144c7a	12	*
JMF	12:0071cb144c7a	13	* Unless required by applicable law or agreed to in writing, software
JMF	12:0071cb144c7a	14	* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
JMF	12:0071cb144c7a	15	* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
JMF	12:0071cb144c7a	16	* See the License for the specific language governing permissions and
JMF	12:0071cb144c7a	17	* limitations under the License.
JMF	12:0071cb144c7a	18	*
JMF	12:0071cb144c7a	19	* This file is part of mbed TLS (https://tls.mbed.org)
JMF	12:0071cb144c7a	20	*/
JMF	12:0071cb144c7a	21	/*
JMF	12:0071cb144c7a	22	* The following sources were referenced in the design of this implementation
JMF	12:0071cb144c7a	23	* of the RSA algorithm:
JMF	12:0071cb144c7a	24	*
JMF	12:0071cb144c7a	25	* [1] A method for obtaining digital signatures and public-key cryptosystems
JMF	12:0071cb144c7a	26	* R Rivest, A Shamir, and L Adleman
JMF	12:0071cb144c7a	27	* http://people.csail.mit.edu/rivest/pubs.html#RSA78
JMF	12:0071cb144c7a	28	*
JMF	12:0071cb144c7a	29	* [2] Handbook of Applied Cryptography - 1997, Chapter 8
JMF	12:0071cb144c7a	30	* Menezes, van Oorschot and Vanstone
JMF	12:0071cb144c7a	31	*
JMF	12:0071cb144c7a	32	*/
JMF	12:0071cb144c7a	33
JMF	12:0071cb144c7a	34	#if !defined(MBEDTLS_CONFIG_FILE)
JMF	12:0071cb144c7a	35	#include "mbedtls/config.h"
JMF	12:0071cb144c7a	36	#else
JMF	12:0071cb144c7a	37	#include MBEDTLS_CONFIG_FILE
JMF	12:0071cb144c7a	38	#endif
JMF	12:0071cb144c7a	39
JMF	12:0071cb144c7a	40	#if defined(MBEDTLS_RSA_C)
JMF	12:0071cb144c7a	41
JMF	12:0071cb144c7a	42	#include "mbedtls/rsa.h"
JMF	12:0071cb144c7a	43	#include "mbedtls/oid.h"
JMF	12:0071cb144c7a	44
JMF	12:0071cb144c7a	45	#include <string.h>
JMF	12:0071cb144c7a	46
JMF	12:0071cb144c7a	47	#if defined(MBEDTLS_PKCS1_V21)
JMF	12:0071cb144c7a	48	#include "mbedtls/md.h"
JMF	12:0071cb144c7a	49	#endif
JMF	12:0071cb144c7a	50
JMF	12:0071cb144c7a	51	#if defined(MBEDTLS_PKCS1_V15) && !defined(__OpenBSD__)
JMF	12:0071cb144c7a	52	#include <stdlib.h>
JMF	12:0071cb144c7a	53	#endif
JMF	12:0071cb144c7a	54
JMF	12:0071cb144c7a	55	#if defined(MBEDTLS_PLATFORM_C)
JMF	12:0071cb144c7a	56	#include "mbedtls/platform.h"
JMF	12:0071cb144c7a	57	#else
JMF	12:0071cb144c7a	58	#include <stdio.h>
JMF	12:0071cb144c7a	59	#define mbedtls_printf printf
JMF	12:0071cb144c7a	60	#define mbedtls_calloc calloc
JMF	12:0071cb144c7a	61	#define mbedtls_free free
JMF	12:0071cb144c7a	62	#endif
JMF	12:0071cb144c7a	63
JMF	12:0071cb144c7a	64	/*
JMF	12:0071cb144c7a	65	* Initialize an RSA context
JMF	12:0071cb144c7a	66	*/
JMF	12:0071cb144c7a	67	void mbedtls_rsa_init( mbedtls_rsa_context *ctx,
JMF	12:0071cb144c7a	68	int padding,
JMF	12:0071cb144c7a	69	int hash_id )
JMF	12:0071cb144c7a	70	{
JMF	12:0071cb144c7a	71	memset( ctx, 0, sizeof( mbedtls_rsa_context ) );
JMF	12:0071cb144c7a	72
JMF	12:0071cb144c7a	73	mbedtls_rsa_set_padding( ctx, padding, hash_id );
JMF	12:0071cb144c7a	74
JMF	12:0071cb144c7a	75	#if defined(MBEDTLS_THREADING_C)
JMF	12:0071cb144c7a	76	mbedtls_mutex_init( &ctx->mutex );
JMF	12:0071cb144c7a	77	#endif
JMF	12:0071cb144c7a	78	}
JMF	12:0071cb144c7a	79
JMF	12:0071cb144c7a	80	/*
JMF	12:0071cb144c7a	81	* Set padding for an existing RSA context
JMF	12:0071cb144c7a	82	*/
JMF	12:0071cb144c7a	83	void mbedtls_rsa_set_padding( mbedtls_rsa_context *ctx, int padding, int hash_id )
JMF	12:0071cb144c7a	84	{
JMF	12:0071cb144c7a	85	ctx->padding = padding;
JMF	12:0071cb144c7a	86	ctx->hash_id = hash_id;
JMF	12:0071cb144c7a	87	}
JMF	12:0071cb144c7a	88
JMF	12:0071cb144c7a	89	#if defined(MBEDTLS_GENPRIME)
JMF	12:0071cb144c7a	90
JMF	12:0071cb144c7a	91	/*
JMF	12:0071cb144c7a	92	* Generate an RSA keypair
JMF	12:0071cb144c7a	93	*/
JMF	12:0071cb144c7a	94	int mbedtls_rsa_gen_key( mbedtls_rsa_context *ctx,
JMF	12:0071cb144c7a	95	int (f_rng)(void , unsigned char *, size_t),
JMF	12:0071cb144c7a	96	void *p_rng,
JMF	12:0071cb144c7a	97	unsigned int nbits, int exponent )
JMF	12:0071cb144c7a	98	{
JMF	12:0071cb144c7a	99	int ret;
JMF	12:0071cb144c7a	100	mbedtls_mpi P1, Q1, H, G;
JMF	12:0071cb144c7a	101
JMF	12:0071cb144c7a	102	if( f_rng == NULL \|\| nbits < 128 \|\| exponent < 3 )
JMF	12:0071cb144c7a	103	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
JMF	12:0071cb144c7a	104
JMF	12:0071cb144c7a	105	mbedtls_mpi_init( &P1 ); mbedtls_mpi_init( &Q1 );
JMF	12:0071cb144c7a	106	mbedtls_mpi_init( &H ); mbedtls_mpi_init( &G );
JMF	12:0071cb144c7a	107
JMF	12:0071cb144c7a	108	/*
JMF	12:0071cb144c7a	109	* find primes P and Q with Q < P so that:
JMF	12:0071cb144c7a	110	* GCD( E, (P-1)*(Q-1) ) == 1
JMF	12:0071cb144c7a	111	*/
JMF	12:0071cb144c7a	112	MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &ctx->E, exponent ) );
JMF	12:0071cb144c7a	113
JMF	12:0071cb144c7a	114	do
JMF	12:0071cb144c7a	115	{
JMF	12:0071cb144c7a	116	MBEDTLS_MPI_CHK( mbedtls_mpi_gen_prime( &ctx->P, nbits >> 1, 0,
JMF	12:0071cb144c7a	117	f_rng, p_rng ) );
JMF	12:0071cb144c7a	118
JMF	12:0071cb144c7a	119	if( nbits % 2 )
JMF	12:0071cb144c7a	120	{
JMF	12:0071cb144c7a	121	MBEDTLS_MPI_CHK( mbedtls_mpi_gen_prime( &ctx->Q, ( nbits >> 1 ) + 1, 0,
JMF	12:0071cb144c7a	122	f_rng, p_rng ) );
JMF	12:0071cb144c7a	123	}
JMF	12:0071cb144c7a	124	else
JMF	12:0071cb144c7a	125	{
JMF	12:0071cb144c7a	126	MBEDTLS_MPI_CHK( mbedtls_mpi_gen_prime( &ctx->Q, nbits >> 1, 0,
JMF	12:0071cb144c7a	127	f_rng, p_rng ) );
JMF	12:0071cb144c7a	128	}
JMF	12:0071cb144c7a	129
JMF	12:0071cb144c7a	130	if( mbedtls_mpi_cmp_mpi( &ctx->P, &ctx->Q ) == 0 )
JMF	12:0071cb144c7a	131	continue;
JMF	12:0071cb144c7a	132
JMF	12:0071cb144c7a	133	MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &ctx->N, &ctx->P, &ctx->Q ) );
JMF	12:0071cb144c7a	134	if( mbedtls_mpi_bitlen( &ctx->N ) != nbits )
JMF	12:0071cb144c7a	135	continue;
JMF	12:0071cb144c7a	136
JMF	12:0071cb144c7a	137	MBEDTLS_MPI_CHK( mbedtls_mpi_sub_int( &P1, &ctx->P, 1 ) );
JMF	12:0071cb144c7a	138	MBEDTLS_MPI_CHK( mbedtls_mpi_sub_int( &Q1, &ctx->Q, 1 ) );
JMF	12:0071cb144c7a	139	MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &H, &P1, &Q1 ) );
JMF	12:0071cb144c7a	140	MBEDTLS_MPI_CHK( mbedtls_mpi_gcd( &G, &ctx->E, &H ) );
JMF	12:0071cb144c7a	141	}
JMF	12:0071cb144c7a	142	while( mbedtls_mpi_cmp_int( &G, 1 ) != 0 );
JMF	12:0071cb144c7a	143
JMF	12:0071cb144c7a	144	/*
JMF	12:0071cb144c7a	145	* D = E^-1 mod ((P-1)*(Q-1))
JMF	12:0071cb144c7a	146	* DP = D mod (P - 1)
JMF	12:0071cb144c7a	147	* DQ = D mod (Q - 1)
JMF	12:0071cb144c7a	148	* QP = Q^-1 mod P
JMF	12:0071cb144c7a	149	*/
JMF	12:0071cb144c7a	150	MBEDTLS_MPI_CHK( mbedtls_mpi_inv_mod( &ctx->D , &ctx->E, &H ) );
JMF	12:0071cb144c7a	151	MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &ctx->DP, &ctx->D, &P1 ) );
JMF	12:0071cb144c7a	152	MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &ctx->DQ, &ctx->D, &Q1 ) );
JMF	12:0071cb144c7a	153	MBEDTLS_MPI_CHK( mbedtls_mpi_inv_mod( &ctx->QP, &ctx->Q, &ctx->P ) );
JMF	12:0071cb144c7a	154
JMF	12:0071cb144c7a	155	ctx->len = ( mbedtls_mpi_bitlen( &ctx->N ) + 7 ) >> 3;
JMF	12:0071cb144c7a	156
JMF	12:0071cb144c7a	157	cleanup:
JMF	12:0071cb144c7a	158
JMF	12:0071cb144c7a	159	mbedtls_mpi_free( &P1 ); mbedtls_mpi_free( &Q1 ); mbedtls_mpi_free( &H ); mbedtls_mpi_free( &G );
JMF	12:0071cb144c7a	160
JMF	12:0071cb144c7a	161	if( ret != 0 )
JMF	12:0071cb144c7a	162	{
JMF	12:0071cb144c7a	163	mbedtls_rsa_free( ctx );
JMF	12:0071cb144c7a	164	return( MBEDTLS_ERR_RSA_KEY_GEN_FAILED + ret );
JMF	12:0071cb144c7a	165	}
JMF	12:0071cb144c7a	166
JMF	12:0071cb144c7a	167	return( 0 );
JMF	12:0071cb144c7a	168	}
JMF	12:0071cb144c7a	169
JMF	12:0071cb144c7a	170	#endif /* MBEDTLS_GENPRIME */
JMF	12:0071cb144c7a	171
JMF	12:0071cb144c7a	172	/*
JMF	12:0071cb144c7a	173	* Check a public RSA key
JMF	12:0071cb144c7a	174	*/
JMF	12:0071cb144c7a	175	int mbedtls_rsa_check_pubkey( const mbedtls_rsa_context *ctx )
JMF	12:0071cb144c7a	176	{
JMF	12:0071cb144c7a	177	if( !ctx->N.p \|\| !ctx->E.p )
JMF	12:0071cb144c7a	178	return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED );
JMF	12:0071cb144c7a	179
JMF	12:0071cb144c7a	180	if( ( ctx->N.p[0] & 1 ) == 0 \|\|
JMF	12:0071cb144c7a	181	( ctx->E.p[0] & 1 ) == 0 )
JMF	12:0071cb144c7a	182	return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED );
JMF	12:0071cb144c7a	183
JMF	12:0071cb144c7a	184	if( mbedtls_mpi_bitlen( &ctx->N ) < 128 \|\|
JMF	12:0071cb144c7a	185	mbedtls_mpi_bitlen( &ctx->N ) > MBEDTLS_MPI_MAX_BITS )
JMF	12:0071cb144c7a	186	return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED );
JMF	12:0071cb144c7a	187
JMF	12:0071cb144c7a	188	if( mbedtls_mpi_bitlen( &ctx->E ) < 2 \|\|
JMF	12:0071cb144c7a	189	mbedtls_mpi_cmp_mpi( &ctx->E, &ctx->N ) >= 0 )
JMF	12:0071cb144c7a	190	return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED );
JMF	12:0071cb144c7a	191
JMF	12:0071cb144c7a	192	return( 0 );
JMF	12:0071cb144c7a	193	}
JMF	12:0071cb144c7a	194
JMF	12:0071cb144c7a	195	/*
JMF	12:0071cb144c7a	196	* Check a private RSA key
JMF	12:0071cb144c7a	197	*/
JMF	12:0071cb144c7a	198	int mbedtls_rsa_check_privkey( const mbedtls_rsa_context *ctx )
JMF	12:0071cb144c7a	199	{
JMF	12:0071cb144c7a	200	int ret;
JMF	12:0071cb144c7a	201	mbedtls_mpi PQ, DE, P1, Q1, H, I, G, G2, L1, L2, DP, DQ, QP;
JMF	12:0071cb144c7a	202
JMF	12:0071cb144c7a	203	if( ( ret = mbedtls_rsa_check_pubkey( ctx ) ) != 0 )
JMF	12:0071cb144c7a	204	return( ret );
JMF	12:0071cb144c7a	205
JMF	12:0071cb144c7a	206	if( !ctx->P.p \|\| !ctx->Q.p \|\| !ctx->D.p )
JMF	12:0071cb144c7a	207	return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED );
JMF	12:0071cb144c7a	208
JMF	12:0071cb144c7a	209	mbedtls_mpi_init( &PQ ); mbedtls_mpi_init( &DE ); mbedtls_mpi_init( &P1 ); mbedtls_mpi_init( &Q1 );
JMF	12:0071cb144c7a	210	mbedtls_mpi_init( &H ); mbedtls_mpi_init( &I ); mbedtls_mpi_init( &G ); mbedtls_mpi_init( &G2 );
JMF	12:0071cb144c7a	211	mbedtls_mpi_init( &L1 ); mbedtls_mpi_init( &L2 ); mbedtls_mpi_init( &DP ); mbedtls_mpi_init( &DQ );
JMF	12:0071cb144c7a	212	mbedtls_mpi_init( &QP );
JMF	12:0071cb144c7a	213
JMF	12:0071cb144c7a	214	MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &PQ, &ctx->P, &ctx->Q ) );
JMF	12:0071cb144c7a	215	MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &DE, &ctx->D, &ctx->E ) );
JMF	12:0071cb144c7a	216	MBEDTLS_MPI_CHK( mbedtls_mpi_sub_int( &P1, &ctx->P, 1 ) );
JMF	12:0071cb144c7a	217	MBEDTLS_MPI_CHK( mbedtls_mpi_sub_int( &Q1, &ctx->Q, 1 ) );
JMF	12:0071cb144c7a	218	MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &H, &P1, &Q1 ) );
JMF	12:0071cb144c7a	219	MBEDTLS_MPI_CHK( mbedtls_mpi_gcd( &G, &ctx->E, &H ) );
JMF	12:0071cb144c7a	220
JMF	12:0071cb144c7a	221	MBEDTLS_MPI_CHK( mbedtls_mpi_gcd( &G2, &P1, &Q1 ) );
JMF	12:0071cb144c7a	222	MBEDTLS_MPI_CHK( mbedtls_mpi_div_mpi( &L1, &L2, &H, &G2 ) );
JMF	12:0071cb144c7a	223	MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &I, &DE, &L1 ) );
JMF	12:0071cb144c7a	224
JMF	12:0071cb144c7a	225	MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &DP, &ctx->D, &P1 ) );
JMF	12:0071cb144c7a	226	MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &DQ, &ctx->D, &Q1 ) );
JMF	12:0071cb144c7a	227	MBEDTLS_MPI_CHK( mbedtls_mpi_inv_mod( &QP, &ctx->Q, &ctx->P ) );
JMF	12:0071cb144c7a	228	/*
JMF	12:0071cb144c7a	229	* Check for a valid PKCS1v2 private key
JMF	12:0071cb144c7a	230	*/
JMF	12:0071cb144c7a	231	if( mbedtls_mpi_cmp_mpi( &PQ, &ctx->N ) != 0 \|\|
JMF	12:0071cb144c7a	232	mbedtls_mpi_cmp_mpi( &DP, &ctx->DP ) != 0 \|\|
JMF	12:0071cb144c7a	233	mbedtls_mpi_cmp_mpi( &DQ, &ctx->DQ ) != 0 \|\|
JMF	12:0071cb144c7a	234	mbedtls_mpi_cmp_mpi( &QP, &ctx->QP ) != 0 \|\|
JMF	12:0071cb144c7a	235	mbedtls_mpi_cmp_int( &L2, 0 ) != 0 \|\|
JMF	12:0071cb144c7a	236	mbedtls_mpi_cmp_int( &I, 1 ) != 0 \|\|
JMF	12:0071cb144c7a	237	mbedtls_mpi_cmp_int( &G, 1 ) != 0 )
JMF	12:0071cb144c7a	238	{
JMF	12:0071cb144c7a	239	ret = MBEDTLS_ERR_RSA_KEY_CHECK_FAILED;
JMF	12:0071cb144c7a	240	}
JMF	12:0071cb144c7a	241
JMF	12:0071cb144c7a	242	cleanup:
JMF	12:0071cb144c7a	243	mbedtls_mpi_free( &PQ ); mbedtls_mpi_free( &DE ); mbedtls_mpi_free( &P1 ); mbedtls_mpi_free( &Q1 );
JMF	12:0071cb144c7a	244	mbedtls_mpi_free( &H ); mbedtls_mpi_free( &I ); mbedtls_mpi_free( &G ); mbedtls_mpi_free( &G2 );
JMF	12:0071cb144c7a	245	mbedtls_mpi_free( &L1 ); mbedtls_mpi_free( &L2 ); mbedtls_mpi_free( &DP ); mbedtls_mpi_free( &DQ );
JMF	12:0071cb144c7a	246	mbedtls_mpi_free( &QP );
JMF	12:0071cb144c7a	247
JMF	12:0071cb144c7a	248	if( ret == MBEDTLS_ERR_RSA_KEY_CHECK_FAILED )
JMF	12:0071cb144c7a	249	return( ret );
JMF	12:0071cb144c7a	250
JMF	12:0071cb144c7a	251	if( ret != 0 )
JMF	12:0071cb144c7a	252	return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED + ret );
JMF	12:0071cb144c7a	253
JMF	12:0071cb144c7a	254	return( 0 );
JMF	12:0071cb144c7a	255	}
JMF	12:0071cb144c7a	256
JMF	12:0071cb144c7a	257	/*
JMF	12:0071cb144c7a	258	* Check if contexts holding a public and private key match
JMF	12:0071cb144c7a	259	*/
JMF	12:0071cb144c7a	260	int mbedtls_rsa_check_pub_priv( const mbedtls_rsa_context pub, const mbedtls_rsa_context prv )
JMF	12:0071cb144c7a	261	{
JMF	12:0071cb144c7a	262	if( mbedtls_rsa_check_pubkey( pub ) != 0 \|\|
JMF	12:0071cb144c7a	263	mbedtls_rsa_check_privkey( prv ) != 0 )
JMF	12:0071cb144c7a	264	{
JMF	12:0071cb144c7a	265	return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED );
JMF	12:0071cb144c7a	266	}
JMF	12:0071cb144c7a	267
JMF	12:0071cb144c7a	268	if( mbedtls_mpi_cmp_mpi( &pub->N, &prv->N ) != 0 \|\|
JMF	12:0071cb144c7a	269	mbedtls_mpi_cmp_mpi( &pub->E, &prv->E ) != 0 )
JMF	12:0071cb144c7a	270	{
JMF	12:0071cb144c7a	271	return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED );
JMF	12:0071cb144c7a	272	}
JMF	12:0071cb144c7a	273
JMF	12:0071cb144c7a	274	return( 0 );
JMF	12:0071cb144c7a	275	}
JMF	12:0071cb144c7a	276
JMF	12:0071cb144c7a	277	/*
JMF	12:0071cb144c7a	278	* Do an RSA public key operation
JMF	12:0071cb144c7a	279	*/
JMF	12:0071cb144c7a	280	int mbedtls_rsa_public( mbedtls_rsa_context *ctx,
JMF	12:0071cb144c7a	281	const unsigned char *input,
JMF	12:0071cb144c7a	282	unsigned char *output )
JMF	12:0071cb144c7a	283	{
JMF	12:0071cb144c7a	284	int ret;
JMF	12:0071cb144c7a	285	size_t olen;
JMF	12:0071cb144c7a	286	mbedtls_mpi T;
JMF	12:0071cb144c7a	287
JMF	12:0071cb144c7a	288	mbedtls_mpi_init( &T );
JMF	12:0071cb144c7a	289	#if defined(MBEDTLS_THREADING_C)
JMF	12:0071cb144c7a	290	if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
JMF	12:0071cb144c7a	291	return( ret );
JMF	12:0071cb144c7a	292	#endif
JMF	12:0071cb144c7a	293
JMF	12:0071cb144c7a	294	MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &T, input, ctx->len ) );
JMF	12:0071cb144c7a	295
JMF	12:0071cb144c7a	296	if( mbedtls_mpi_cmp_mpi( &T, &ctx->N ) >= 0 )
JMF	12:0071cb144c7a	297	{
JMF	12:0071cb144c7a	298	ret = MBEDTLS_ERR_MPI_BAD_INPUT_DATA;
JMF	12:0071cb144c7a	299	goto cleanup;
JMF	12:0071cb144c7a	300	}
JMF	12:0071cb144c7a	301
JMF	12:0071cb144c7a	302	olen = ctx->len;
JMF	12:0071cb144c7a	303	MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &T, &T, &ctx->E, &ctx->N, &ctx->RN ) );
JMF	12:0071cb144c7a	304	MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &T, output, olen ) );
JMF	12:0071cb144c7a	305
JMF	12:0071cb144c7a	306	cleanup:
JMF	12:0071cb144c7a	307	#if defined(MBEDTLS_THREADING_C)
JMF	12:0071cb144c7a	308	if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
JMF	12:0071cb144c7a	309	return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
JMF	12:0071cb144c7a	310	#endif
JMF	12:0071cb144c7a	311
JMF	12:0071cb144c7a	312	mbedtls_mpi_free( &T );
JMF	12:0071cb144c7a	313
JMF	12:0071cb144c7a	314	if( ret != 0 )
JMF	12:0071cb144c7a	315	return( MBEDTLS_ERR_RSA_PUBLIC_FAILED + ret );
JMF	12:0071cb144c7a	316
JMF	12:0071cb144c7a	317	return( 0 );
JMF	12:0071cb144c7a	318	}
JMF	12:0071cb144c7a	319
JMF	12:0071cb144c7a	320	/*
JMF	12:0071cb144c7a	321	* Generate or update blinding values, see section 10 of:
JMF	12:0071cb144c7a	322	* KOCHER, Paul C. Timing attacks on implementations of Diffie-Hellman, RSA,
JMF	12:0071cb144c7a	323	* DSS, and other systems. In : Advances in Cryptology-CRYPTO'96. Springer
JMF	12:0071cb144c7a	324	* Berlin Heidelberg, 1996. p. 104-113.
JMF	12:0071cb144c7a	325	*/
JMF	12:0071cb144c7a	326	static int rsa_prepare_blinding( mbedtls_rsa_context *ctx,
JMF	12:0071cb144c7a	327	int (f_rng)(void , unsigned char , size_t), void p_rng )
JMF	12:0071cb144c7a	328	{
JMF	12:0071cb144c7a	329	int ret, count = 0;
JMF	12:0071cb144c7a	330
JMF	12:0071cb144c7a	331	if( ctx->Vf.p != NULL )
JMF	12:0071cb144c7a	332	{
JMF	12:0071cb144c7a	333	/* We already have blinding values, just update them by squaring */
JMF	12:0071cb144c7a	334	MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &ctx->Vi, &ctx->Vi, &ctx->Vi ) );
JMF	12:0071cb144c7a	335	MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &ctx->Vi, &ctx->Vi, &ctx->N ) );
JMF	12:0071cb144c7a	336	MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &ctx->Vf, &ctx->Vf, &ctx->Vf ) );
JMF	12:0071cb144c7a	337	MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &ctx->Vf, &ctx->Vf, &ctx->N ) );
JMF	12:0071cb144c7a	338
JMF	12:0071cb144c7a	339	goto cleanup;
JMF	12:0071cb144c7a	340	}
JMF	12:0071cb144c7a	341
JMF	12:0071cb144c7a	342	/* Unblinding value: Vf = random number, invertible mod N */
JMF	12:0071cb144c7a	343	do {
JMF	12:0071cb144c7a	344	if( count++ > 10 )
JMF	12:0071cb144c7a	345	return( MBEDTLS_ERR_RSA_RNG_FAILED );
JMF	12:0071cb144c7a	346
JMF	12:0071cb144c7a	347	MBEDTLS_MPI_CHK( mbedtls_mpi_fill_random( &ctx->Vf, ctx->len - 1, f_rng, p_rng ) );
JMF	12:0071cb144c7a	348	MBEDTLS_MPI_CHK( mbedtls_mpi_gcd( &ctx->Vi, &ctx->Vf, &ctx->N ) );
JMF	12:0071cb144c7a	349	} while( mbedtls_mpi_cmp_int( &ctx->Vi, 1 ) != 0 );
JMF	12:0071cb144c7a	350
JMF	12:0071cb144c7a	351	/* Blinding value: Vi = Vf^(-e) mod N */
JMF	12:0071cb144c7a	352	MBEDTLS_MPI_CHK( mbedtls_mpi_inv_mod( &ctx->Vi, &ctx->Vf, &ctx->N ) );
JMF	12:0071cb144c7a	353	MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &ctx->Vi, &ctx->Vi, &ctx->E, &ctx->N, &ctx->RN ) );
JMF	12:0071cb144c7a	354
JMF	12:0071cb144c7a	355
JMF	12:0071cb144c7a	356	cleanup:
JMF	12:0071cb144c7a	357	return( ret );
JMF	12:0071cb144c7a	358	}
JMF	12:0071cb144c7a	359
JMF	12:0071cb144c7a	360	/*
JMF	12:0071cb144c7a	361	* Do an RSA private key operation
JMF	12:0071cb144c7a	362	*/
JMF	12:0071cb144c7a	363	int mbedtls_rsa_private( mbedtls_rsa_context *ctx,
JMF	12:0071cb144c7a	364	int (f_rng)(void , unsigned char *, size_t),
JMF	12:0071cb144c7a	365	void *p_rng,
JMF	12:0071cb144c7a	366	const unsigned char *input,
JMF	12:0071cb144c7a	367	unsigned char *output )
JMF	12:0071cb144c7a	368	{
JMF	12:0071cb144c7a	369	int ret;
JMF	12:0071cb144c7a	370	size_t olen;
JMF	12:0071cb144c7a	371	mbedtls_mpi T, T1, T2;
JMF	12:0071cb144c7a	372	/* Make sure we have private key info, prevent possible misuse */
JMF	12:0071cb144c7a	373	if( ctx->P.p == NULL \|\| ctx->Q.p == NULL \|\| ctx->D.p == NULL )
JMF	12:0071cb144c7a	374	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
JMF	12:0071cb144c7a	375	mbedtls_mpi_init( &T ); mbedtls_mpi_init( &T1 ); mbedtls_mpi_init( &T2 );
JMF	12:0071cb144c7a	376	#if defined(MBEDTLS_THREADING_C)
JMF	12:0071cb144c7a	377	if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
JMF	12:0071cb144c7a	378	return( ret );
JMF	12:0071cb144c7a	379	#endif
JMF	12:0071cb144c7a	380	MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &T, input, ctx->len ) );
JMF	12:0071cb144c7a	381	if( mbedtls_mpi_cmp_mpi( &T, &ctx->N ) >= 0 )
JMF	12:0071cb144c7a	382	{
JMF	12:0071cb144c7a	383	ret = MBEDTLS_ERR_MPI_BAD_INPUT_DATA;
JMF	12:0071cb144c7a	384	goto cleanup;
JMF	12:0071cb144c7a	385	}
JMF	12:0071cb144c7a	386	if( f_rng != NULL )
JMF	12:0071cb144c7a	387	{
JMF	12:0071cb144c7a	388	/*
JMF	12:0071cb144c7a	389	* Blinding
JMF	12:0071cb144c7a	390	* T = T * Vi mod N
JMF	12:0071cb144c7a	391	*/
JMF	12:0071cb144c7a	392	MBEDTLS_MPI_CHK( rsa_prepare_blinding( ctx, f_rng, p_rng ) );
JMF	12:0071cb144c7a	393
JMF	12:0071cb144c7a	394	MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &T, &T, &ctx->Vi ) );
JMF	12:0071cb144c7a	395	MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &T, &T, &ctx->N ) );
JMF	12:0071cb144c7a	396	}
JMF	12:0071cb144c7a	397	#if defined(MBEDTLS_RSA_NO_CRT)
JMF	12:0071cb144c7a	398	MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &T, &T, &ctx->D, &ctx->N, &ctx->RN ) );
JMF	12:0071cb144c7a	399	#else
JMF	12:0071cb144c7a	400	/*
JMF	12:0071cb144c7a	401	* faster decryption using the CRT
JMF	12:0071cb144c7a	402	*
JMF	12:0071cb144c7a	403	* T1 = input ^ dP mod P
JMF	12:0071cb144c7a	404	* T2 = input ^ dQ mod Q
JMF	12:0071cb144c7a	405	*/
JMF	12:0071cb144c7a	406	MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &T1, &T, &ctx->DP, &ctx->P, &ctx->RP ) );
JMF	12:0071cb144c7a	407	MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &T2, &T, &ctx->DQ, &ctx->Q, &ctx->RQ ) );
JMF	12:0071cb144c7a	408	/*
JMF	12:0071cb144c7a	409	* T = (T1 - T2) * (Q^-1 mod P) mod P
JMF	12:0071cb144c7a	410	*/
JMF	12:0071cb144c7a	411	MBEDTLS_MPI_CHK( mbedtls_mpi_sub_mpi( &T, &T1, &T2 ) );
JMF	12:0071cb144c7a	412	MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &T1, &T, &ctx->QP ) );
JMF	12:0071cb144c7a	413	MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &T, &T1, &ctx->P ) );
JMF	12:0071cb144c7a	414
JMF	12:0071cb144c7a	415	/*
JMF	12:0071cb144c7a	416	* T = T2 + T * Q
JMF	12:0071cb144c7a	417	*/
JMF	12:0071cb144c7a	418	MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &T1, &T, &ctx->Q ) );
JMF	12:0071cb144c7a	419	MBEDTLS_MPI_CHK( mbedtls_mpi_add_mpi( &T, &T2, &T1 ) );
JMF	12:0071cb144c7a	420	#endif /* MBEDTLS_RSA_NO_CRT */
JMF	12:0071cb144c7a	421	if( f_rng != NULL )
JMF	12:0071cb144c7a	422	{
JMF	12:0071cb144c7a	423	/*
JMF	12:0071cb144c7a	424	* Unblind
JMF	12:0071cb144c7a	425	* T = T * Vf mod N
JMF	12:0071cb144c7a	426	*/
JMF	12:0071cb144c7a	427	MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &T, &T, &ctx->Vf ) );
JMF	12:0071cb144c7a	428	MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &T, &T, &ctx->N ) );
JMF	12:0071cb144c7a	429	}
JMF	12:0071cb144c7a	430	olen = ctx->len;
JMF	12:0071cb144c7a	431	MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &T, output, olen ) );
JMF	12:0071cb144c7a	432
JMF	12:0071cb144c7a	433	cleanup:
JMF	12:0071cb144c7a	434	#if defined(MBEDTLS_THREADING_C)
JMF	12:0071cb144c7a	435	if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
JMF	12:0071cb144c7a	436	return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
JMF	12:0071cb144c7a	437	#endif
JMF	12:0071cb144c7a	438	mbedtls_mpi_free( &T ); mbedtls_mpi_free( &T1 ); mbedtls_mpi_free( &T2 );
JMF	12:0071cb144c7a	439
JMF	12:0071cb144c7a	440	if( ret != 0 )
JMF	12:0071cb144c7a	441	return( MBEDTLS_ERR_RSA_PRIVATE_FAILED + ret );
JMF	12:0071cb144c7a	442
JMF	12:0071cb144c7a	443	return( 0 );
JMF	12:0071cb144c7a	444	}
JMF	12:0071cb144c7a	445
JMF	12:0071cb144c7a	446	#if defined(MBEDTLS_PKCS1_V21)
JMF	12:0071cb144c7a	447	/**
JMF	12:0071cb144c7a	448	* Generate and apply the MGF1 operation (from PKCS#1 v2.1) to a buffer.
JMF	12:0071cb144c7a	449	*
JMF	12:0071cb144c7a	450	* \param dst buffer to mask
JMF	12:0071cb144c7a	451	* \param dlen length of destination buffer
JMF	12:0071cb144c7a	452	* \param src source of the mask generation
JMF	12:0071cb144c7a	453	* \param slen length of the source buffer
JMF	12:0071cb144c7a	454	* \param md_ctx message digest context to use
JMF	12:0071cb144c7a	455	*/
JMF	12:0071cb144c7a	456	static void mgf_mask( unsigned char dst, size_t dlen, unsigned char src,
JMF	12:0071cb144c7a	457	size_t slen, mbedtls_md_context_t *md_ctx )
JMF	12:0071cb144c7a	458	{
JMF	12:0071cb144c7a	459	unsigned char mask[MBEDTLS_MD_MAX_SIZE];
JMF	12:0071cb144c7a	460	unsigned char counter[4];
JMF	12:0071cb144c7a	461	unsigned char *p;
JMF	12:0071cb144c7a	462	unsigned int hlen;
JMF	12:0071cb144c7a	463	size_t i, use_len;
JMF	12:0071cb144c7a	464
JMF	12:0071cb144c7a	465	memset( mask, 0, MBEDTLS_MD_MAX_SIZE );
JMF	12:0071cb144c7a	466	memset( counter, 0, 4 );
JMF	12:0071cb144c7a	467
JMF	12:0071cb144c7a	468	hlen = mbedtls_md_get_size( md_ctx->md_info );
JMF	12:0071cb144c7a	469
JMF	12:0071cb144c7a	470	/* Generate and apply dbMask */
JMF	12:0071cb144c7a	471	p = dst;
JMF	12:0071cb144c7a	472
JMF	12:0071cb144c7a	473	while( dlen > 0 )
JMF	12:0071cb144c7a	474	{
JMF	12:0071cb144c7a	475	use_len = hlen;
JMF	12:0071cb144c7a	476	if( dlen < hlen )
JMF	12:0071cb144c7a	477	use_len = dlen;
JMF	12:0071cb144c7a	478
JMF	12:0071cb144c7a	479	mbedtls_md_starts( md_ctx );
JMF	12:0071cb144c7a	480	mbedtls_md_update( md_ctx, src, slen );
JMF	12:0071cb144c7a	481	mbedtls_md_update( md_ctx, counter, 4 );
JMF	12:0071cb144c7a	482	mbedtls_md_finish( md_ctx, mask );
JMF	12:0071cb144c7a	483
JMF	12:0071cb144c7a	484	for( i = 0; i < use_len; ++i )
JMF	12:0071cb144c7a	485	*p++ ^= mask[i];
JMF	12:0071cb144c7a	486
JMF	12:0071cb144c7a	487	counter[3]++;
JMF	12:0071cb144c7a	488
JMF	12:0071cb144c7a	489	dlen -= use_len;
JMF	12:0071cb144c7a	490	}
JMF	12:0071cb144c7a	491	}
JMF	12:0071cb144c7a	492	#endif /* MBEDTLS_PKCS1_V21 */
JMF	12:0071cb144c7a	493
JMF	12:0071cb144c7a	494	#if defined(MBEDTLS_PKCS1_V21)
JMF	12:0071cb144c7a	495	/*
JMF	12:0071cb144c7a	496	* Implementation of the PKCS#1 v2.1 RSAES-OAEP-ENCRYPT function
JMF	12:0071cb144c7a	497	*/
JMF	12:0071cb144c7a	498	int mbedtls_rsa_rsaes_oaep_encrypt( mbedtls_rsa_context *ctx,
JMF	12:0071cb144c7a	499	int (f_rng)(void , unsigned char *, size_t),
JMF	12:0071cb144c7a	500	void *p_rng,
JMF	12:0071cb144c7a	501	int mode,
JMF	12:0071cb144c7a	502	const unsigned char *label, size_t label_len,
JMF	12:0071cb144c7a	503	size_t ilen,
JMF	12:0071cb144c7a	504	const unsigned char *input,
JMF	12:0071cb144c7a	505	unsigned char *output )
JMF	12:0071cb144c7a	506	{
JMF	12:0071cb144c7a	507	size_t olen;
JMF	12:0071cb144c7a	508	int ret;
JMF	12:0071cb144c7a	509	unsigned char *p = output;
JMF	12:0071cb144c7a	510	unsigned int hlen;
JMF	12:0071cb144c7a	511	const mbedtls_md_info_t *md_info;
JMF	12:0071cb144c7a	512	mbedtls_md_context_t md_ctx;
JMF	12:0071cb144c7a	513
JMF	12:0071cb144c7a	514	if( mode == MBEDTLS_RSA_PRIVATE && ctx->padding != MBEDTLS_RSA_PKCS_V21 )
JMF	12:0071cb144c7a	515	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
JMF	12:0071cb144c7a	516
JMF	12:0071cb144c7a	517	if( f_rng == NULL )
JMF	12:0071cb144c7a	518	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
JMF	12:0071cb144c7a	519
JMF	12:0071cb144c7a	520	md_info = mbedtls_md_info_from_type( (mbedtls_md_type_t) ctx->hash_id );
JMF	12:0071cb144c7a	521	if( md_info == NULL )
JMF	12:0071cb144c7a	522	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
JMF	12:0071cb144c7a	523
JMF	12:0071cb144c7a	524	olen = ctx->len;
JMF	12:0071cb144c7a	525	hlen = mbedtls_md_get_size( md_info );
JMF	12:0071cb144c7a	526
JMF	12:0071cb144c7a	527	/* first comparison checks for overflow */
JMF	12:0071cb144c7a	528	if( ilen + 2 * hlen + 2 < ilen \|\| olen < ilen + 2 * hlen + 2 )
JMF	12:0071cb144c7a	529	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
JMF	12:0071cb144c7a	530
JMF	12:0071cb144c7a	531	memset( output, 0, olen );
JMF	12:0071cb144c7a	532
JMF	12:0071cb144c7a	533	*p++ = 0;
JMF	12:0071cb144c7a	534
JMF	12:0071cb144c7a	535	/* Generate a random octet string seed */
JMF	12:0071cb144c7a	536	if( ( ret = f_rng( p_rng, p, hlen ) ) != 0 )
JMF	12:0071cb144c7a	537	return( MBEDTLS_ERR_RSA_RNG_FAILED + ret );
JMF	12:0071cb144c7a	538
JMF	12:0071cb144c7a	539	p += hlen;
JMF	12:0071cb144c7a	540
JMF	12:0071cb144c7a	541	/* Construct DB */
JMF	12:0071cb144c7a	542	mbedtls_md( md_info, label, label_len, p );
JMF	12:0071cb144c7a	543	p += hlen;
JMF	12:0071cb144c7a	544	p += olen - 2 * hlen - 2 - ilen;
JMF	12:0071cb144c7a	545	*p++ = 1;
JMF	12:0071cb144c7a	546	memcpy( p, input, ilen );
JMF	12:0071cb144c7a	547
JMF	12:0071cb144c7a	548	mbedtls_md_init( &md_ctx );
JMF	12:0071cb144c7a	549	if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 0 ) ) != 0 )
JMF	12:0071cb144c7a	550	{
JMF	12:0071cb144c7a	551	mbedtls_md_free( &md_ctx );
JMF	12:0071cb144c7a	552	return( ret );
JMF	12:0071cb144c7a	553	}
JMF	12:0071cb144c7a	554
JMF	12:0071cb144c7a	555	/* maskedDB: Apply dbMask to DB */
JMF	12:0071cb144c7a	556	mgf_mask( output + hlen + 1, olen - hlen - 1, output + 1, hlen,
JMF	12:0071cb144c7a	557	&md_ctx );
JMF	12:0071cb144c7a	558
JMF	12:0071cb144c7a	559	/* maskedSeed: Apply seedMask to seed */
JMF	12:0071cb144c7a	560	mgf_mask( output + 1, hlen, output + hlen + 1, olen - hlen - 1,
JMF	12:0071cb144c7a	561	&md_ctx );
JMF	12:0071cb144c7a	562
JMF	12:0071cb144c7a	563	mbedtls_md_free( &md_ctx );
JMF	12:0071cb144c7a	564
JMF	12:0071cb144c7a	565	return( ( mode == MBEDTLS_RSA_PUBLIC )
JMF	12:0071cb144c7a	566	? mbedtls_rsa_public( ctx, output, output )
JMF	12:0071cb144c7a	567	: mbedtls_rsa_private( ctx, f_rng, p_rng, output, output ) );
JMF	12:0071cb144c7a	568	}
JMF	12:0071cb144c7a	569	#endif /* MBEDTLS_PKCS1_V21 */
JMF	12:0071cb144c7a	570
JMF	12:0071cb144c7a	571	#if defined(MBEDTLS_PKCS1_V15)
JMF	12:0071cb144c7a	572	/*
JMF	12:0071cb144c7a	573	* Implementation of the PKCS#1 v2.1 RSAES-PKCS1-V1_5-ENCRYPT function
JMF	12:0071cb144c7a	574	*/
JMF	12:0071cb144c7a	575	int mbedtls_rsa_rsaes_pkcs1_v15_encrypt( mbedtls_rsa_context *ctx,
JMF	12:0071cb144c7a	576	int (f_rng)(void , unsigned char *, size_t),
JMF	12:0071cb144c7a	577	void *p_rng,
JMF	12:0071cb144c7a	578	int mode, size_t ilen,
JMF	12:0071cb144c7a	579	const unsigned char *input,
JMF	12:0071cb144c7a	580	unsigned char *output )
JMF	12:0071cb144c7a	581	{
JMF	12:0071cb144c7a	582	size_t nb_pad, olen;
JMF	12:0071cb144c7a	583	int ret;
JMF	12:0071cb144c7a	584	unsigned char *p = output;
JMF	12:0071cb144c7a	585
JMF	12:0071cb144c7a	586	if( mode == MBEDTLS_RSA_PRIVATE && ctx->padding != MBEDTLS_RSA_PKCS_V15 )
JMF	12:0071cb144c7a	587	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
JMF	12:0071cb144c7a	588
JMF	12:0071cb144c7a	589	// We don't check p_rng because it won't be dereferenced here
JMF	12:0071cb144c7a	590	if( f_rng == NULL \|\| input == NULL \|\| output == NULL )
JMF	12:0071cb144c7a	591	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
JMF	12:0071cb144c7a	592
JMF	12:0071cb144c7a	593	olen = ctx->len;
JMF	12:0071cb144c7a	594
JMF	12:0071cb144c7a	595	/* first comparison checks for overflow */
JMF	12:0071cb144c7a	596	if( ilen + 11 < ilen \|\| olen < ilen + 11 )
JMF	12:0071cb144c7a	597	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
JMF	12:0071cb144c7a	598
JMF	12:0071cb144c7a	599	nb_pad = olen - 3 - ilen;
JMF	12:0071cb144c7a	600
JMF	12:0071cb144c7a	601	*p++ = 0;
JMF	12:0071cb144c7a	602	if( mode == MBEDTLS_RSA_PUBLIC )
JMF	12:0071cb144c7a	603	{
JMF	12:0071cb144c7a	604	*p++ = MBEDTLS_RSA_CRYPT;
JMF	12:0071cb144c7a	605
JMF	12:0071cb144c7a	606	while( nb_pad-- > 0 )
JMF	12:0071cb144c7a	607	{
JMF	12:0071cb144c7a	608	int rng_dl = 100;
JMF	12:0071cb144c7a	609
JMF	12:0071cb144c7a	610	do {
JMF	12:0071cb144c7a	611	ret = f_rng( p_rng, p, 1 );
JMF	12:0071cb144c7a	612	} while( *p == 0 && --rng_dl && ret == 0 );
JMF	12:0071cb144c7a	613
JMF	12:0071cb144c7a	614	/* Check if RNG failed to generate data */
JMF	12:0071cb144c7a	615	if( rng_dl == 0 \|\| ret != 0 )
JMF	12:0071cb144c7a	616	return( MBEDTLS_ERR_RSA_RNG_FAILED + ret );
JMF	12:0071cb144c7a	617
JMF	12:0071cb144c7a	618	p++;
JMF	12:0071cb144c7a	619	}
JMF	12:0071cb144c7a	620	}
JMF	12:0071cb144c7a	621	else
JMF	12:0071cb144c7a	622	{
JMF	12:0071cb144c7a	623	*p++ = MBEDTLS_RSA_SIGN;
JMF	12:0071cb144c7a	624
JMF	12:0071cb144c7a	625	while( nb_pad-- > 0 )
JMF	12:0071cb144c7a	626	*p++ = 0xFF;
JMF	12:0071cb144c7a	627	}
JMF	12:0071cb144c7a	628
JMF	12:0071cb144c7a	629	*p++ = 0;
JMF	12:0071cb144c7a	630	memcpy( p, input, ilen );
JMF	12:0071cb144c7a	631
JMF	12:0071cb144c7a	632	return( ( mode == MBEDTLS_RSA_PUBLIC )
JMF	12:0071cb144c7a	633	? mbedtls_rsa_public( ctx, output, output )
JMF	12:0071cb144c7a	634	: mbedtls_rsa_private( ctx, f_rng, p_rng, output, output ) );
JMF	12:0071cb144c7a	635	}
JMF	12:0071cb144c7a	636	#endif /* MBEDTLS_PKCS1_V15 */
JMF	12:0071cb144c7a	637
JMF	12:0071cb144c7a	638	/*
JMF	12:0071cb144c7a	639	* Add the message padding, then do an RSA operation
JMF	12:0071cb144c7a	640	*/
JMF	12:0071cb144c7a	641	int mbedtls_rsa_pkcs1_encrypt( mbedtls_rsa_context *ctx,
JMF	12:0071cb144c7a	642	int (f_rng)(void , unsigned char *, size_t),
JMF	12:0071cb144c7a	643	void *p_rng,
JMF	12:0071cb144c7a	644	int mode, size_t ilen,
JMF	12:0071cb144c7a	645	const unsigned char *input,
JMF	12:0071cb144c7a	646	unsigned char *output )
JMF	12:0071cb144c7a	647	{
JMF	12:0071cb144c7a	648	switch( ctx->padding )
JMF	12:0071cb144c7a	649	{
JMF	12:0071cb144c7a	650	#if defined(MBEDTLS_PKCS1_V15)
JMF	12:0071cb144c7a	651	case MBEDTLS_RSA_PKCS_V15:
JMF	12:0071cb144c7a	652	return mbedtls_rsa_rsaes_pkcs1_v15_encrypt( ctx, f_rng, p_rng, mode, ilen,
JMF	12:0071cb144c7a	653	input, output );
JMF	12:0071cb144c7a	654	#endif
JMF	12:0071cb144c7a	655
JMF	12:0071cb144c7a	656	#if defined(MBEDTLS_PKCS1_V21)
JMF	12:0071cb144c7a	657	case MBEDTLS_RSA_PKCS_V21:
JMF	12:0071cb144c7a	658	return mbedtls_rsa_rsaes_oaep_encrypt( ctx, f_rng, p_rng, mode, NULL, 0,
JMF	12:0071cb144c7a	659	ilen, input, output );
JMF	12:0071cb144c7a	660	#endif
JMF	12:0071cb144c7a	661
JMF	12:0071cb144c7a	662	default:
JMF	12:0071cb144c7a	663	return( MBEDTLS_ERR_RSA_INVALID_PADDING );
JMF	12:0071cb144c7a	664	}
JMF	12:0071cb144c7a	665	}
JMF	12:0071cb144c7a	666
JMF	12:0071cb144c7a	667	#if defined(MBEDTLS_PKCS1_V21)
JMF	12:0071cb144c7a	668	/*
JMF	12:0071cb144c7a	669	* Implementation of the PKCS#1 v2.1 RSAES-OAEP-DECRYPT function
JMF	12:0071cb144c7a	670	*/
JMF	12:0071cb144c7a	671	int mbedtls_rsa_rsaes_oaep_decrypt( mbedtls_rsa_context *ctx,
JMF	12:0071cb144c7a	672	int (f_rng)(void , unsigned char *, size_t),
JMF	12:0071cb144c7a	673	void *p_rng,
JMF	12:0071cb144c7a	674	int mode,
JMF	12:0071cb144c7a	675	const unsigned char *label, size_t label_len,
JMF	12:0071cb144c7a	676	size_t *olen,
JMF	12:0071cb144c7a	677	const unsigned char *input,
JMF	12:0071cb144c7a	678	unsigned char *output,
JMF	12:0071cb144c7a	679	size_t output_max_len )
JMF	12:0071cb144c7a	680	{
JMF	12:0071cb144c7a	681	int ret;
JMF	12:0071cb144c7a	682	size_t ilen, i, pad_len;
JMF	12:0071cb144c7a	683	unsigned char *p, bad, pad_done;
JMF	12:0071cb144c7a	684	unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
JMF	12:0071cb144c7a	685	unsigned char lhash[MBEDTLS_MD_MAX_SIZE];
JMF	12:0071cb144c7a	686	unsigned int hlen;
JMF	12:0071cb144c7a	687	const mbedtls_md_info_t *md_info;
JMF	12:0071cb144c7a	688	mbedtls_md_context_t md_ctx;
JMF	12:0071cb144c7a	689
JMF	12:0071cb144c7a	690	/*
JMF	12:0071cb144c7a	691	* Parameters sanity checks
JMF	12:0071cb144c7a	692	*/
JMF	12:0071cb144c7a	693	if( mode == MBEDTLS_RSA_PRIVATE && ctx->padding != MBEDTLS_RSA_PKCS_V21 )
JMF	12:0071cb144c7a	694	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
JMF	12:0071cb144c7a	695
JMF	12:0071cb144c7a	696	ilen = ctx->len;
JMF	12:0071cb144c7a	697
JMF	12:0071cb144c7a	698	if( ilen < 16 \|\| ilen > sizeof( buf ) )
JMF	12:0071cb144c7a	699	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
JMF	12:0071cb144c7a	700
JMF	12:0071cb144c7a	701	md_info = mbedtls_md_info_from_type( (mbedtls_md_type_t) ctx->hash_id );
JMF	12:0071cb144c7a	702	if( md_info == NULL )
JMF	12:0071cb144c7a	703	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
JMF	12:0071cb144c7a	704
JMF	12:0071cb144c7a	705	hlen = mbedtls_md_get_size( md_info );
JMF	12:0071cb144c7a	706
JMF	12:0071cb144c7a	707	// checking for integer underflow
JMF	12:0071cb144c7a	708	if( 2 * hlen + 2 > ilen )
JMF	12:0071cb144c7a	709	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
JMF	12:0071cb144c7a	710
JMF	12:0071cb144c7a	711	/*
JMF	12:0071cb144c7a	712	* RSA operation
JMF	12:0071cb144c7a	713	*/
JMF	12:0071cb144c7a	714	ret = ( mode == MBEDTLS_RSA_PUBLIC )
JMF	12:0071cb144c7a	715	? mbedtls_rsa_public( ctx, input, buf )
JMF	12:0071cb144c7a	716	: mbedtls_rsa_private( ctx, f_rng, p_rng, input, buf );
JMF	12:0071cb144c7a	717
JMF	12:0071cb144c7a	718	if( ret != 0 )
JMF	12:0071cb144c7a	719	return( ret );
JMF	12:0071cb144c7a	720
JMF	12:0071cb144c7a	721	/*
JMF	12:0071cb144c7a	722	* Unmask data and generate lHash
JMF	12:0071cb144c7a	723	*/
JMF	12:0071cb144c7a	724	mbedtls_md_init( &md_ctx );
JMF	12:0071cb144c7a	725	if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 0 ) ) != 0 )
JMF	12:0071cb144c7a	726	{
JMF	12:0071cb144c7a	727	mbedtls_md_free( &md_ctx );
JMF	12:0071cb144c7a	728	return( ret );
JMF	12:0071cb144c7a	729	}
JMF	12:0071cb144c7a	730
JMF	12:0071cb144c7a	731
JMF	12:0071cb144c7a	732	/* Generate lHash */
JMF	12:0071cb144c7a	733	mbedtls_md( md_info, label, label_len, lhash );
JMF	12:0071cb144c7a	734
JMF	12:0071cb144c7a	735	/* seed: Apply seedMask to maskedSeed */
JMF	12:0071cb144c7a	736	mgf_mask( buf + 1, hlen, buf + hlen + 1, ilen - hlen - 1,
JMF	12:0071cb144c7a	737	&md_ctx );
JMF	12:0071cb144c7a	738
JMF	12:0071cb144c7a	739	/* DB: Apply dbMask to maskedDB */
JMF	12:0071cb144c7a	740	mgf_mask( buf + hlen + 1, ilen - hlen - 1, buf + 1, hlen,
JMF	12:0071cb144c7a	741	&md_ctx );
JMF	12:0071cb144c7a	742
JMF	12:0071cb144c7a	743	mbedtls_md_free( &md_ctx );
JMF	12:0071cb144c7a	744
JMF	12:0071cb144c7a	745	/*
JMF	12:0071cb144c7a	746	* Check contents, in "constant-time"
JMF	12:0071cb144c7a	747	*/
JMF	12:0071cb144c7a	748	p = buf;
JMF	12:0071cb144c7a	749	bad = 0;
JMF	12:0071cb144c7a	750
JMF	12:0071cb144c7a	751	bad \|= p++; / First byte must be 0 */
JMF	12:0071cb144c7a	752
JMF	12:0071cb144c7a	753	p += hlen; /* Skip seed */
JMF	12:0071cb144c7a	754
JMF	12:0071cb144c7a	755	/* Check lHash */
JMF	12:0071cb144c7a	756	for( i = 0; i < hlen; i++ )
JMF	12:0071cb144c7a	757	bad \|= lhash[i] ^ *p++;
JMF	12:0071cb144c7a	758
JMF	12:0071cb144c7a	759	/* Get zero-padding len, but always read till end of buffer
JMF	12:0071cb144c7a	760	* (minus one, for the 01 byte) */
JMF	12:0071cb144c7a	761	pad_len = 0;
JMF	12:0071cb144c7a	762	pad_done = 0;
JMF	12:0071cb144c7a	763	for( i = 0; i < ilen - 2 * hlen - 2; i++ )
JMF	12:0071cb144c7a	764	{
JMF	12:0071cb144c7a	765	pad_done \|= p[i];
JMF	12:0071cb144c7a	766	pad_len += ((pad_done \| (unsigned char)-pad_done) >> 7) ^ 1;
JMF	12:0071cb144c7a	767	}
JMF	12:0071cb144c7a	768
JMF	12:0071cb144c7a	769	p += pad_len;
JMF	12:0071cb144c7a	770	bad \|= *p++ ^ 0x01;
JMF	12:0071cb144c7a	771
JMF	12:0071cb144c7a	772	/*
JMF	12:0071cb144c7a	773	* The only information "leaked" is whether the padding was correct or not
JMF	12:0071cb144c7a	774	* (eg, no data is copied if it was not correct). This meets the
JMF	12:0071cb144c7a	775	* recommendations in PKCS#1 v2.2: an opponent cannot distinguish between
JMF	12:0071cb144c7a	776	* the different error conditions.
JMF	12:0071cb144c7a	777	*/
JMF	12:0071cb144c7a	778	if( bad != 0 )
JMF	12:0071cb144c7a	779	return( MBEDTLS_ERR_RSA_INVALID_PADDING );
JMF	12:0071cb144c7a	780
JMF	12:0071cb144c7a	781	if( ilen - ( p - buf ) > output_max_len )
JMF	12:0071cb144c7a	782	return( MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE );
JMF	12:0071cb144c7a	783
JMF	12:0071cb144c7a	784	*olen = ilen - (p - buf);
JMF	12:0071cb144c7a	785	memcpy( output, p, *olen );
JMF	12:0071cb144c7a	786
JMF	12:0071cb144c7a	787	return( 0 );
JMF	12:0071cb144c7a	788	}
JMF	12:0071cb144c7a	789	#endif /* MBEDTLS_PKCS1_V21 */
JMF	12:0071cb144c7a	790
JMF	12:0071cb144c7a	791	#if defined(MBEDTLS_PKCS1_V15)
JMF	12:0071cb144c7a	792	/*
JMF	12:0071cb144c7a	793	* Implementation of the PKCS#1 v2.1 RSAES-PKCS1-V1_5-DECRYPT function
JMF	12:0071cb144c7a	794	*/
JMF	12:0071cb144c7a	795	int mbedtls_rsa_rsaes_pkcs1_v15_decrypt( mbedtls_rsa_context *ctx,
JMF	12:0071cb144c7a	796	int (f_rng)(void , unsigned char *, size_t),
JMF	12:0071cb144c7a	797	void *p_rng,
JMF	12:0071cb144c7a	798	int mode, size_t *olen,
JMF	12:0071cb144c7a	799	const unsigned char *input,
JMF	12:0071cb144c7a	800	unsigned char *output,
JMF	12:0071cb144c7a	801	size_t output_max_len)
JMF	12:0071cb144c7a	802	{
JMF	12:0071cb144c7a	803	int ret;
JMF	12:0071cb144c7a	804	size_t ilen, pad_count = 0, i;
JMF	12:0071cb144c7a	805	unsigned char *p, bad, pad_done = 0;
JMF	12:0071cb144c7a	806	unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
JMF	12:0071cb144c7a	807	if( mode == MBEDTLS_RSA_PRIVATE && ctx->padding != MBEDTLS_RSA_PKCS_V15 )
JMF	12:0071cb144c7a	808	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
JMF	12:0071cb144c7a	809	ilen = ctx->len;
JMF	12:0071cb144c7a	810
JMF	12:0071cb144c7a	811	if( ilen < 16 \|\| ilen > sizeof( buf ) )
JMF	12:0071cb144c7a	812	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
JMF	12:0071cb144c7a	813	ret = ( mode == MBEDTLS_RSA_PUBLIC )
JMF	12:0071cb144c7a	814	? mbedtls_rsa_public( ctx, input, buf )
JMF	12:0071cb144c7a	815	: mbedtls_rsa_private( ctx, f_rng, p_rng, input, buf );
JMF	12:0071cb144c7a	816	if( ret != 0 )
JMF	12:0071cb144c7a	817	return( ret );
JMF	12:0071cb144c7a	818	p = buf;
JMF	12:0071cb144c7a	819	bad = 0;
JMF	12:0071cb144c7a	820
JMF	12:0071cb144c7a	821	/*
JMF	12:0071cb144c7a	822	* Check and get padding len in "constant-time"
JMF	12:0071cb144c7a	823	*/
JMF	12:0071cb144c7a	824	bad \|= p++; / First byte must be 0 */
JMF	12:0071cb144c7a	825	/* This test does not depend on secret data */
JMF	12:0071cb144c7a	826	if( mode == MBEDTLS_RSA_PRIVATE )
JMF	12:0071cb144c7a	827	{
JMF	12:0071cb144c7a	828	bad \|= *p++ ^ MBEDTLS_RSA_CRYPT;
JMF	12:0071cb144c7a	829
JMF	12:0071cb144c7a	830	/* Get padding len, but always read till end of buffer
JMF	12:0071cb144c7a	831	* (minus one, for the 00 byte) */
JMF	12:0071cb144c7a	832	for( i = 0; i < ilen - 3; i++ )
JMF	12:0071cb144c7a	833	{
JMF	12:0071cb144c7a	834	pad_done \|= ((p[i] \| (unsigned char)-p[i]) >> 7) ^ 1;
JMF	12:0071cb144c7a	835	pad_count += ((pad_done \| (unsigned char)-pad_done) >> 7) ^ 1;
JMF	12:0071cb144c7a	836	}
JMF	12:0071cb144c7a	837
JMF	12:0071cb144c7a	838	p += pad_count;
JMF	12:0071cb144c7a	839	bad \|= p++; / Must be zero */
JMF	12:0071cb144c7a	840	}
JMF	12:0071cb144c7a	841	else
JMF	12:0071cb144c7a	842	{
JMF	12:0071cb144c7a	843	bad \|= *p++ ^ MBEDTLS_RSA_SIGN;
JMF	12:0071cb144c7a	844
JMF	12:0071cb144c7a	845	/* Get padding len, but always read till end of buffer
JMF	12:0071cb144c7a	846	* (minus one, for the 00 byte) */
JMF	12:0071cb144c7a	847	for( i = 0; i < ilen - 3; i++ )
JMF	12:0071cb144c7a	848	{
JMF	12:0071cb144c7a	849	pad_done \|= ( p[i] != 0xFF );
JMF	12:0071cb144c7a	850	pad_count += ( pad_done == 0 );
JMF	12:0071cb144c7a	851	}
JMF	12:0071cb144c7a	852
JMF	12:0071cb144c7a	853	p += pad_count;
JMF	12:0071cb144c7a	854	bad \|= p++; / Must be zero */
JMF	12:0071cb144c7a	855	}
JMF	12:0071cb144c7a	856
JMF	12:0071cb144c7a	857	bad \|= ( pad_count < 8 );
JMF	12:0071cb144c7a	858	if( bad )
JMF	12:0071cb144c7a	859	return( MBEDTLS_ERR_RSA_INVALID_PADDING );
JMF	12:0071cb144c7a	860	if( ilen - ( p - buf ) > output_max_len )
JMF	12:0071cb144c7a	861	return( MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE );
JMF	12:0071cb144c7a	862	*olen = ilen - (p - buf);
JMF	12:0071cb144c7a	863	memcpy( output, p, *olen );
JMF	12:0071cb144c7a	864
JMF	12:0071cb144c7a	865	return( 0 );
JMF	12:0071cb144c7a	866	}
JMF	12:0071cb144c7a	867	#endif /* MBEDTLS_PKCS1_V15 */
JMF	12:0071cb144c7a	868
JMF	12:0071cb144c7a	869	/*
JMF	12:0071cb144c7a	870	* Do an RSA operation, then remove the message padding
JMF	12:0071cb144c7a	871	*/
JMF	12:0071cb144c7a	872	int mbedtls_rsa_pkcs1_decrypt( mbedtls_rsa_context *ctx,
JMF	12:0071cb144c7a	873	int (f_rng)(void , unsigned char *, size_t),
JMF	12:0071cb144c7a	874	void *p_rng,
JMF	12:0071cb144c7a	875	int mode, size_t *olen,
JMF	12:0071cb144c7a	876	const unsigned char *input,
JMF	12:0071cb144c7a	877	unsigned char *output,
JMF	12:0071cb144c7a	878	size_t output_max_len)
JMF	12:0071cb144c7a	879	{
JMF	12:0071cb144c7a	880	switch( ctx->padding )
JMF	12:0071cb144c7a	881	{
JMF	12:0071cb144c7a	882	#if defined(MBEDTLS_PKCS1_V15)
JMF	12:0071cb144c7a	883	case MBEDTLS_RSA_PKCS_V15:
JMF	12:0071cb144c7a	884	return mbedtls_rsa_rsaes_pkcs1_v15_decrypt( ctx, f_rng, p_rng, mode, olen,
JMF	12:0071cb144c7a	885	input, output, output_max_len );
JMF	12:0071cb144c7a	886	#endif
JMF	12:0071cb144c7a	887
JMF	12:0071cb144c7a	888	#if defined(MBEDTLS_PKCS1_V21)
JMF	12:0071cb144c7a	889	case MBEDTLS_RSA_PKCS_V21:
JMF	12:0071cb144c7a	890	return mbedtls_rsa_rsaes_oaep_decrypt( ctx, f_rng, p_rng, mode, NULL, 0,
JMF	12:0071cb144c7a	891	olen, input, output,
JMF	12:0071cb144c7a	892	output_max_len );
JMF	12:0071cb144c7a	893	#endif
JMF	12:0071cb144c7a	894
JMF	12:0071cb144c7a	895	default:
JMF	12:0071cb144c7a	896	return( MBEDTLS_ERR_RSA_INVALID_PADDING );
JMF	12:0071cb144c7a	897	}
JMF	12:0071cb144c7a	898	}
JMF	12:0071cb144c7a	899
JMF	12:0071cb144c7a	900	#if defined(MBEDTLS_PKCS1_V21)
JMF	12:0071cb144c7a	901	/*
JMF	12:0071cb144c7a	902	* Implementation of the PKCS#1 v2.1 RSASSA-PSS-SIGN function
JMF	12:0071cb144c7a	903	*/
JMF	12:0071cb144c7a	904	int mbedtls_rsa_rsassa_pss_sign( mbedtls_rsa_context *ctx,
JMF	12:0071cb144c7a	905	int (f_rng)(void , unsigned char *, size_t),
JMF	12:0071cb144c7a	906	void *p_rng,
JMF	12:0071cb144c7a	907	int mode,
JMF	12:0071cb144c7a	908	mbedtls_md_type_t md_alg,
JMF	12:0071cb144c7a	909	unsigned int hashlen,
JMF	12:0071cb144c7a	910	const unsigned char *hash,
JMF	12:0071cb144c7a	911	unsigned char *sig )
JMF	12:0071cb144c7a	912	{
JMF	12:0071cb144c7a	913	size_t olen;
JMF	12:0071cb144c7a	914	unsigned char *p = sig;
JMF	12:0071cb144c7a	915	unsigned char salt[MBEDTLS_MD_MAX_SIZE];
JMF	12:0071cb144c7a	916	unsigned int slen, hlen, offset = 0;
JMF	12:0071cb144c7a	917	int ret;
JMF	12:0071cb144c7a	918	size_t msb;
JMF	12:0071cb144c7a	919	const mbedtls_md_info_t *md_info;
JMF	12:0071cb144c7a	920	mbedtls_md_context_t md_ctx;
JMF	12:0071cb144c7a	921
JMF	12:0071cb144c7a	922	if( mode == MBEDTLS_RSA_PRIVATE && ctx->padding != MBEDTLS_RSA_PKCS_V21 )
JMF	12:0071cb144c7a	923	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
JMF	12:0071cb144c7a	924
JMF	12:0071cb144c7a	925	if( f_rng == NULL )
JMF	12:0071cb144c7a	926	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
JMF	12:0071cb144c7a	927
JMF	12:0071cb144c7a	928	olen = ctx->len;
JMF	12:0071cb144c7a	929
JMF	12:0071cb144c7a	930	if( md_alg != MBEDTLS_MD_NONE )
JMF	12:0071cb144c7a	931	{
JMF	12:0071cb144c7a	932	/* Gather length of hash to sign */
JMF	12:0071cb144c7a	933	md_info = mbedtls_md_info_from_type( md_alg );
JMF	12:0071cb144c7a	934	if( md_info == NULL )
JMF	12:0071cb144c7a	935	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
JMF	12:0071cb144c7a	936
JMF	12:0071cb144c7a	937	hashlen = mbedtls_md_get_size( md_info );
JMF	12:0071cb144c7a	938	}
JMF	12:0071cb144c7a	939
JMF	12:0071cb144c7a	940	md_info = mbedtls_md_info_from_type( (mbedtls_md_type_t) ctx->hash_id );
JMF	12:0071cb144c7a	941	if( md_info == NULL )
JMF	12:0071cb144c7a	942	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
JMF	12:0071cb144c7a	943
JMF	12:0071cb144c7a	944	hlen = mbedtls_md_get_size( md_info );
JMF	12:0071cb144c7a	945	slen = hlen;
JMF	12:0071cb144c7a	946
JMF	12:0071cb144c7a	947	if( olen < hlen + slen + 2 )
JMF	12:0071cb144c7a	948	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
JMF	12:0071cb144c7a	949
JMF	12:0071cb144c7a	950	memset( sig, 0, olen );
JMF	12:0071cb144c7a	951
JMF	12:0071cb144c7a	952	/* Generate salt of length slen */
JMF	12:0071cb144c7a	953	if( ( ret = f_rng( p_rng, salt, slen ) ) != 0 )
JMF	12:0071cb144c7a	954	return( MBEDTLS_ERR_RSA_RNG_FAILED + ret );
JMF	12:0071cb144c7a	955
JMF	12:0071cb144c7a	956	/* Note: EMSA-PSS encoding is over the length of N - 1 bits */
JMF	12:0071cb144c7a	957	msb = mbedtls_mpi_bitlen( &ctx->N ) - 1;
JMF	12:0071cb144c7a	958	p += olen - hlen * 2 - 2;
JMF	12:0071cb144c7a	959	*p++ = 0x01;
JMF	12:0071cb144c7a	960	memcpy( p, salt, slen );
JMF	12:0071cb144c7a	961	p += slen;
JMF	12:0071cb144c7a	962
JMF	12:0071cb144c7a	963	mbedtls_md_init( &md_ctx );
JMF	12:0071cb144c7a	964	if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 0 ) ) != 0 )
JMF	12:0071cb144c7a	965	{
JMF	12:0071cb144c7a	966	mbedtls_md_free( &md_ctx );
JMF	12:0071cb144c7a	967	return( ret );
JMF	12:0071cb144c7a	968	}
JMF	12:0071cb144c7a	969
JMF	12:0071cb144c7a	970	/* Generate H = Hash( M' ) */
JMF	12:0071cb144c7a	971	mbedtls_md_starts( &md_ctx );
JMF	12:0071cb144c7a	972	mbedtls_md_update( &md_ctx, p, 8 );
JMF	12:0071cb144c7a	973	mbedtls_md_update( &md_ctx, hash, hashlen );
JMF	12:0071cb144c7a	974	mbedtls_md_update( &md_ctx, salt, slen );
JMF	12:0071cb144c7a	975	mbedtls_md_finish( &md_ctx, p );
JMF	12:0071cb144c7a	976
JMF	12:0071cb144c7a	977	/* Compensate for boundary condition when applying mask */
JMF	12:0071cb144c7a	978	if( msb % 8 == 0 )
JMF	12:0071cb144c7a	979	offset = 1;
JMF	12:0071cb144c7a	980
JMF	12:0071cb144c7a	981	/* maskedDB: Apply dbMask to DB */
JMF	12:0071cb144c7a	982	mgf_mask( sig + offset, olen - hlen - 1 - offset, p, hlen, &md_ctx );
JMF	12:0071cb144c7a	983
JMF	12:0071cb144c7a	984	mbedtls_md_free( &md_ctx );
JMF	12:0071cb144c7a	985
JMF	12:0071cb144c7a	986	msb = mbedtls_mpi_bitlen( &ctx->N ) - 1;
JMF	12:0071cb144c7a	987	sig[0] &= 0xFF >> ( olen * 8 - msb );
JMF	12:0071cb144c7a	988
JMF	12:0071cb144c7a	989	p += hlen;
JMF	12:0071cb144c7a	990	*p++ = 0xBC;
JMF	12:0071cb144c7a	991
JMF	12:0071cb144c7a	992	return( ( mode == MBEDTLS_RSA_PUBLIC )
JMF	12:0071cb144c7a	993	? mbedtls_rsa_public( ctx, sig, sig )
JMF	12:0071cb144c7a	994	: mbedtls_rsa_private( ctx, f_rng, p_rng, sig, sig ) );
JMF	12:0071cb144c7a	995	}
JMF	12:0071cb144c7a	996	#endif /* MBEDTLS_PKCS1_V21 */
JMF	12:0071cb144c7a	997
JMF	12:0071cb144c7a	998	#if defined(MBEDTLS_PKCS1_V15)
JMF	12:0071cb144c7a	999	/*
JMF	12:0071cb144c7a	1000	* Implementation of the PKCS#1 v2.1 RSASSA-PKCS1-V1_5-SIGN function
JMF	12:0071cb144c7a	1001	*/
JMF	12:0071cb144c7a	1002	/*
JMF	12:0071cb144c7a	1003	* Do an RSA operation to sign the message digest
JMF	12:0071cb144c7a	1004	*/
JMF	12:0071cb144c7a	1005	int mbedtls_rsa_rsassa_pkcs1_v15_sign( mbedtls_rsa_context *ctx,
JMF	12:0071cb144c7a	1006	int (f_rng)(void , unsigned char *, size_t),
JMF	12:0071cb144c7a	1007	void *p_rng,
JMF	12:0071cb144c7a	1008	int mode,
JMF	12:0071cb144c7a	1009	mbedtls_md_type_t md_alg,
JMF	12:0071cb144c7a	1010	unsigned int hashlen,
JMF	12:0071cb144c7a	1011	const unsigned char *hash,
JMF	12:0071cb144c7a	1012	unsigned char *sig )
JMF	12:0071cb144c7a	1013	{
JMF	12:0071cb144c7a	1014	size_t nb_pad, olen, oid_size = 0;
JMF	12:0071cb144c7a	1015	unsigned char *p = sig;
JMF	12:0071cb144c7a	1016	const char *oid = NULL;
JMF	12:0071cb144c7a	1017	unsigned char sig_try = NULL, verif = NULL;
JMF	12:0071cb144c7a	1018	size_t i;
JMF	12:0071cb144c7a	1019	unsigned char diff;
JMF	12:0071cb144c7a	1020	volatile unsigned char diff_no_optimize;
JMF	12:0071cb144c7a	1021	int ret;
JMF	12:0071cb144c7a	1022
JMF	12:0071cb144c7a	1023	if( mode == MBEDTLS_RSA_PRIVATE && ctx->padding != MBEDTLS_RSA_PKCS_V15 )
JMF	12:0071cb144c7a	1024	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
JMF	12:0071cb144c7a	1025
JMF	12:0071cb144c7a	1026	olen = ctx->len;
JMF	12:0071cb144c7a	1027	nb_pad = olen - 3;
JMF	12:0071cb144c7a	1028
JMF	12:0071cb144c7a	1029	if( md_alg != MBEDTLS_MD_NONE )
JMF	12:0071cb144c7a	1030	{
JMF	12:0071cb144c7a	1031	const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type( md_alg );
JMF	12:0071cb144c7a	1032	if( md_info == NULL )
JMF	12:0071cb144c7a	1033	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
JMF	12:0071cb144c7a	1034
JMF	12:0071cb144c7a	1035	if( mbedtls_oid_get_oid_by_md( md_alg, &oid, &oid_size ) != 0 )
JMF	12:0071cb144c7a	1036	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
JMF	12:0071cb144c7a	1037
JMF	12:0071cb144c7a	1038	nb_pad -= 10 + oid_size;
JMF	12:0071cb144c7a	1039
JMF	12:0071cb144c7a	1040	hashlen = mbedtls_md_get_size( md_info );
JMF	12:0071cb144c7a	1041	}
JMF	12:0071cb144c7a	1042
JMF	12:0071cb144c7a	1043	nb_pad -= hashlen;
JMF	12:0071cb144c7a	1044
JMF	12:0071cb144c7a	1045	if( ( nb_pad < 8 ) \|\| ( nb_pad > olen ) )
JMF	12:0071cb144c7a	1046	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
JMF	12:0071cb144c7a	1047
JMF	12:0071cb144c7a	1048	*p++ = 0;
JMF	12:0071cb144c7a	1049	*p++ = MBEDTLS_RSA_SIGN;
JMF	12:0071cb144c7a	1050	memset( p, 0xFF, nb_pad );
JMF	12:0071cb144c7a	1051	p += nb_pad;
JMF	12:0071cb144c7a	1052	*p++ = 0;
JMF	12:0071cb144c7a	1053
JMF	12:0071cb144c7a	1054	if( md_alg == MBEDTLS_MD_NONE )
JMF	12:0071cb144c7a	1055	{
JMF	12:0071cb144c7a	1056	memcpy( p, hash, hashlen );
JMF	12:0071cb144c7a	1057	}
JMF	12:0071cb144c7a	1058	else
JMF	12:0071cb144c7a	1059	{
JMF	12:0071cb144c7a	1060	/*
JMF	12:0071cb144c7a	1061	* DigestInfo ::= SEQUENCE {
JMF	12:0071cb144c7a	1062	* digestAlgorithm DigestAlgorithmIdentifier,
JMF	12:0071cb144c7a	1063	* digest Digest }
JMF	12:0071cb144c7a	1064	*
JMF	12:0071cb144c7a	1065	* DigestAlgorithmIdentifier ::= AlgorithmIdentifier
JMF	12:0071cb144c7a	1066	*
JMF	12:0071cb144c7a	1067	* Digest ::= OCTET STRING
JMF	12:0071cb144c7a	1068	*/
JMF	12:0071cb144c7a	1069	*p++ = MBEDTLS_ASN1_SEQUENCE \| MBEDTLS_ASN1_CONSTRUCTED;
JMF	12:0071cb144c7a	1070	*p++ = (unsigned char) ( 0x08 + oid_size + hashlen );
JMF	12:0071cb144c7a	1071	*p++ = MBEDTLS_ASN1_SEQUENCE \| MBEDTLS_ASN1_CONSTRUCTED;
JMF	12:0071cb144c7a	1072	*p++ = (unsigned char) ( 0x04 + oid_size );
JMF	12:0071cb144c7a	1073	*p++ = MBEDTLS_ASN1_OID;
JMF	12:0071cb144c7a	1074	*p++ = oid_size & 0xFF;
JMF	12:0071cb144c7a	1075	memcpy( p, oid, oid_size );
JMF	12:0071cb144c7a	1076	p += oid_size;
JMF	12:0071cb144c7a	1077	*p++ = MBEDTLS_ASN1_NULL;
JMF	12:0071cb144c7a	1078	*p++ = 0x00;
JMF	12:0071cb144c7a	1079	*p++ = MBEDTLS_ASN1_OCTET_STRING;
JMF	12:0071cb144c7a	1080	*p++ = hashlen;
JMF	12:0071cb144c7a	1081	memcpy( p, hash, hashlen );
JMF	12:0071cb144c7a	1082	}
JMF	12:0071cb144c7a	1083
JMF	12:0071cb144c7a	1084	if( mode == MBEDTLS_RSA_PUBLIC )
JMF	12:0071cb144c7a	1085	return( mbedtls_rsa_public( ctx, sig, sig ) );
JMF	12:0071cb144c7a	1086
JMF	12:0071cb144c7a	1087	/*
JMF	12:0071cb144c7a	1088	* In order to prevent Lenstra's attack, make the signature in a
JMF	12:0071cb144c7a	1089	* temporary buffer and check it before returning it.
JMF	12:0071cb144c7a	1090	*/
JMF	12:0071cb144c7a	1091	sig_try = mbedtls_calloc( 1, ctx->len );
JMF	12:0071cb144c7a	1092	if( sig_try == NULL )
JMF	12:0071cb144c7a	1093	return( MBEDTLS_ERR_MPI_ALLOC_FAILED );
JMF	12:0071cb144c7a	1094
JMF	12:0071cb144c7a	1095	verif = mbedtls_calloc( 1, ctx->len );
JMF	12:0071cb144c7a	1096	if( verif == NULL )
JMF	12:0071cb144c7a	1097	{
JMF	12:0071cb144c7a	1098	mbedtls_free( sig_try );
JMF	12:0071cb144c7a	1099	return( MBEDTLS_ERR_MPI_ALLOC_FAILED );
JMF	12:0071cb144c7a	1100	}
JMF	12:0071cb144c7a	1101
JMF	12:0071cb144c7a	1102	MBEDTLS_MPI_CHK( mbedtls_rsa_private( ctx, f_rng, p_rng, sig, sig_try ) );
JMF	12:0071cb144c7a	1103	MBEDTLS_MPI_CHK( mbedtls_rsa_public( ctx, sig_try, verif ) );
JMF	12:0071cb144c7a	1104
JMF	12:0071cb144c7a	1105	/* Compare in constant time just in case */
JMF	12:0071cb144c7a	1106	for( diff = 0, i = 0; i < ctx->len; i++ )
JMF	12:0071cb144c7a	1107	diff \|= verif[i] ^ sig[i];
JMF	12:0071cb144c7a	1108	diff_no_optimize = diff;
JMF	12:0071cb144c7a	1109
JMF	12:0071cb144c7a	1110	if( diff_no_optimize != 0 )
JMF	12:0071cb144c7a	1111	{
JMF	12:0071cb144c7a	1112	ret = MBEDTLS_ERR_RSA_PRIVATE_FAILED;
JMF	12:0071cb144c7a	1113	goto cleanup;
JMF	12:0071cb144c7a	1114	}
JMF	12:0071cb144c7a	1115
JMF	12:0071cb144c7a	1116	memcpy( sig, sig_try, ctx->len );
JMF	12:0071cb144c7a	1117
JMF	12:0071cb144c7a	1118	cleanup:
JMF	12:0071cb144c7a	1119	mbedtls_free( sig_try );
JMF	12:0071cb144c7a	1120	mbedtls_free( verif );
JMF	12:0071cb144c7a	1121
JMF	12:0071cb144c7a	1122	return( ret );
JMF	12:0071cb144c7a	1123	}
JMF	12:0071cb144c7a	1124	#endif /* MBEDTLS_PKCS1_V15 */
JMF	12:0071cb144c7a	1125
JMF	12:0071cb144c7a	1126	/*
JMF	12:0071cb144c7a	1127	* Do an RSA operation to sign the message digest
JMF	12:0071cb144c7a	1128	*/
JMF	12:0071cb144c7a	1129	int mbedtls_rsa_pkcs1_sign( mbedtls_rsa_context *ctx,
JMF	12:0071cb144c7a	1130	int (f_rng)(void , unsigned char *, size_t),
JMF	12:0071cb144c7a	1131	void *p_rng,
JMF	12:0071cb144c7a	1132	int mode,
JMF	12:0071cb144c7a	1133	mbedtls_md_type_t md_alg,
JMF	12:0071cb144c7a	1134	unsigned int hashlen,
JMF	12:0071cb144c7a	1135	const unsigned char *hash,
JMF	12:0071cb144c7a	1136	unsigned char *sig )
JMF	12:0071cb144c7a	1137	{
JMF	12:0071cb144c7a	1138	switch( ctx->padding )
JMF	12:0071cb144c7a	1139	{
JMF	12:0071cb144c7a	1140	#if defined(MBEDTLS_PKCS1_V15)
JMF	12:0071cb144c7a	1141	case MBEDTLS_RSA_PKCS_V15:
JMF	12:0071cb144c7a	1142	return mbedtls_rsa_rsassa_pkcs1_v15_sign( ctx, f_rng, p_rng, mode, md_alg,
JMF	12:0071cb144c7a	1143	hashlen, hash, sig );
JMF	12:0071cb144c7a	1144	#endif
JMF	12:0071cb144c7a	1145
JMF	12:0071cb144c7a	1146	#if defined(MBEDTLS_PKCS1_V21)
JMF	12:0071cb144c7a	1147	case MBEDTLS_RSA_PKCS_V21:
JMF	12:0071cb144c7a	1148	return mbedtls_rsa_rsassa_pss_sign( ctx, f_rng, p_rng, mode, md_alg,
JMF	12:0071cb144c7a	1149	hashlen, hash, sig );
JMF	12:0071cb144c7a	1150	#endif
JMF	12:0071cb144c7a	1151
JMF	12:0071cb144c7a	1152	default:
JMF	12:0071cb144c7a	1153	return( MBEDTLS_ERR_RSA_INVALID_PADDING );
JMF	12:0071cb144c7a	1154	}
JMF	12:0071cb144c7a	1155	}
JMF	12:0071cb144c7a	1156
JMF	12:0071cb144c7a	1157	#if defined(MBEDTLS_PKCS1_V21)
JMF	12:0071cb144c7a	1158	/*
JMF	12:0071cb144c7a	1159	* Implementation of the PKCS#1 v2.1 RSASSA-PSS-VERIFY function
JMF	12:0071cb144c7a	1160	*/
JMF	12:0071cb144c7a	1161	int mbedtls_rsa_rsassa_pss_verify_ext( mbedtls_rsa_context *ctx,
JMF	12:0071cb144c7a	1162	int (f_rng)(void , unsigned char *, size_t),
JMF	12:0071cb144c7a	1163	void *p_rng,
JMF	12:0071cb144c7a	1164	int mode,
JMF	12:0071cb144c7a	1165	mbedtls_md_type_t md_alg,
JMF	12:0071cb144c7a	1166	unsigned int hashlen,
JMF	12:0071cb144c7a	1167	const unsigned char *hash,
JMF	12:0071cb144c7a	1168	mbedtls_md_type_t mgf1_hash_id,
JMF	12:0071cb144c7a	1169	int expected_salt_len,
JMF	12:0071cb144c7a	1170	const unsigned char *sig )
JMF	12:0071cb144c7a	1171	{
JMF	12:0071cb144c7a	1172	int ret;
JMF	12:0071cb144c7a	1173	size_t siglen;
JMF	12:0071cb144c7a	1174	unsigned char *p;
JMF	12:0071cb144c7a	1175	unsigned char result[MBEDTLS_MD_MAX_SIZE];
JMF	12:0071cb144c7a	1176	unsigned char zeros[8];
JMF	12:0071cb144c7a	1177	unsigned int hlen;
JMF	12:0071cb144c7a	1178	size_t slen, msb;
JMF	12:0071cb144c7a	1179	const mbedtls_md_info_t *md_info;
JMF	12:0071cb144c7a	1180	mbedtls_md_context_t md_ctx;
JMF	12:0071cb144c7a	1181	unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
JMF	12:0071cb144c7a	1182
JMF	12:0071cb144c7a	1183	if( mode == MBEDTLS_RSA_PRIVATE && ctx->padding != MBEDTLS_RSA_PKCS_V21 )
JMF	12:0071cb144c7a	1184	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
JMF	12:0071cb144c7a	1185
JMF	12:0071cb144c7a	1186	siglen = ctx->len;
JMF	12:0071cb144c7a	1187
JMF	12:0071cb144c7a	1188	if( siglen < 16 \|\| siglen > sizeof( buf ) )
JMF	12:0071cb144c7a	1189	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
JMF	12:0071cb144c7a	1190
JMF	12:0071cb144c7a	1191	ret = ( mode == MBEDTLS_RSA_PUBLIC )
JMF	12:0071cb144c7a	1192	? mbedtls_rsa_public( ctx, sig, buf )
JMF	12:0071cb144c7a	1193	: mbedtls_rsa_private( ctx, f_rng, p_rng, sig, buf );
JMF	12:0071cb144c7a	1194
JMF	12:0071cb144c7a	1195	if( ret != 0 )
JMF	12:0071cb144c7a	1196	return( ret );
JMF	12:0071cb144c7a	1197
JMF	12:0071cb144c7a	1198	p = buf;
JMF	12:0071cb144c7a	1199
JMF	12:0071cb144c7a	1200	if( buf[siglen - 1] != 0xBC )
JMF	12:0071cb144c7a	1201	return( MBEDTLS_ERR_RSA_INVALID_PADDING );
JMF	12:0071cb144c7a	1202
JMF	12:0071cb144c7a	1203	if( md_alg != MBEDTLS_MD_NONE )
JMF	12:0071cb144c7a	1204	{
JMF	12:0071cb144c7a	1205	/* Gather length of hash to sign */
JMF	12:0071cb144c7a	1206	md_info = mbedtls_md_info_from_type( md_alg );
JMF	12:0071cb144c7a	1207	if( md_info == NULL )
JMF	12:0071cb144c7a	1208	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
JMF	12:0071cb144c7a	1209
JMF	12:0071cb144c7a	1210	hashlen = mbedtls_md_get_size( md_info );
JMF	12:0071cb144c7a	1211	}
JMF	12:0071cb144c7a	1212
JMF	12:0071cb144c7a	1213	md_info = mbedtls_md_info_from_type( mgf1_hash_id );
JMF	12:0071cb144c7a	1214	if( md_info == NULL )
JMF	12:0071cb144c7a	1215	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
JMF	12:0071cb144c7a	1216
JMF	12:0071cb144c7a	1217	hlen = mbedtls_md_get_size( md_info );
JMF	12:0071cb144c7a	1218	slen = siglen - hlen - 1; /* Currently length of salt + padding */
JMF	12:0071cb144c7a	1219
JMF	12:0071cb144c7a	1220	memset( zeros, 0, 8 );
JMF	12:0071cb144c7a	1221
JMF	12:0071cb144c7a	1222	/*
JMF	12:0071cb144c7a	1223	* Note: EMSA-PSS verification is over the length of N - 1 bits
JMF	12:0071cb144c7a	1224	*/
JMF	12:0071cb144c7a	1225	msb = mbedtls_mpi_bitlen( &ctx->N ) - 1;
JMF	12:0071cb144c7a	1226
JMF	12:0071cb144c7a	1227	/* Compensate for boundary condition when applying mask */
JMF	12:0071cb144c7a	1228	if( msb % 8 == 0 )
JMF	12:0071cb144c7a	1229	{
JMF	12:0071cb144c7a	1230	p++;
JMF	12:0071cb144c7a	1231	siglen -= 1;
JMF	12:0071cb144c7a	1232	}
JMF	12:0071cb144c7a	1233	if( buf[0] >> ( 8 - siglen * 8 + msb ) )
JMF	12:0071cb144c7a	1234	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
JMF	12:0071cb144c7a	1235
JMF	12:0071cb144c7a	1236	mbedtls_md_init( &md_ctx );
JMF	12:0071cb144c7a	1237	if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 0 ) ) != 0 )
JMF	12:0071cb144c7a	1238	{
JMF	12:0071cb144c7a	1239	mbedtls_md_free( &md_ctx );
JMF	12:0071cb144c7a	1240	return( ret );
JMF	12:0071cb144c7a	1241	}
JMF	12:0071cb144c7a	1242
JMF	12:0071cb144c7a	1243	mgf_mask( p, siglen - hlen - 1, p + siglen - hlen - 1, hlen, &md_ctx );
JMF	12:0071cb144c7a	1244
JMF	12:0071cb144c7a	1245	buf[0] &= 0xFF >> ( siglen * 8 - msb );
JMF	12:0071cb144c7a	1246
JMF	12:0071cb144c7a	1247	while( p < buf + siglen && *p == 0 )
JMF	12:0071cb144c7a	1248	p++;
JMF	12:0071cb144c7a	1249
JMF	12:0071cb144c7a	1250	if( p == buf + siglen \|\|
JMF	12:0071cb144c7a	1251	*p++ != 0x01 )
JMF	12:0071cb144c7a	1252	{
JMF	12:0071cb144c7a	1253	mbedtls_md_free( &md_ctx );
JMF	12:0071cb144c7a	1254	return( MBEDTLS_ERR_RSA_INVALID_PADDING );
JMF	12:0071cb144c7a	1255	}
JMF	12:0071cb144c7a	1256
JMF	12:0071cb144c7a	1257	/* Actual salt len */
JMF	12:0071cb144c7a	1258	slen -= p - buf;
JMF	12:0071cb144c7a	1259
JMF	12:0071cb144c7a	1260	if( expected_salt_len != MBEDTLS_RSA_SALT_LEN_ANY &&
JMF	12:0071cb144c7a	1261	slen != (size_t) expected_salt_len )
JMF	12:0071cb144c7a	1262	{
JMF	12:0071cb144c7a	1263	mbedtls_md_free( &md_ctx );
JMF	12:0071cb144c7a	1264	return( MBEDTLS_ERR_RSA_INVALID_PADDING );
JMF	12:0071cb144c7a	1265	}
JMF	12:0071cb144c7a	1266
JMF	12:0071cb144c7a	1267	/*
JMF	12:0071cb144c7a	1268	* Generate H = Hash( M' )
JMF	12:0071cb144c7a	1269	*/
JMF	12:0071cb144c7a	1270	mbedtls_md_starts( &md_ctx );
JMF	12:0071cb144c7a	1271	mbedtls_md_update( &md_ctx, zeros, 8 );
JMF	12:0071cb144c7a	1272	mbedtls_md_update( &md_ctx, hash, hashlen );
JMF	12:0071cb144c7a	1273	mbedtls_md_update( &md_ctx, p, slen );
JMF	12:0071cb144c7a	1274	mbedtls_md_finish( &md_ctx, result );
JMF	12:0071cb144c7a	1275
JMF	12:0071cb144c7a	1276	mbedtls_md_free( &md_ctx );
JMF	12:0071cb144c7a	1277
JMF	12:0071cb144c7a	1278	if( memcmp( p + slen, result, hlen ) == 0 )
JMF	12:0071cb144c7a	1279	return( 0 );
JMF	12:0071cb144c7a	1280	else
JMF	12:0071cb144c7a	1281	return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
JMF	12:0071cb144c7a	1282	}
JMF	12:0071cb144c7a	1283
JMF	12:0071cb144c7a	1284	/*
JMF	12:0071cb144c7a	1285	* Simplified PKCS#1 v2.1 RSASSA-PSS-VERIFY function
JMF	12:0071cb144c7a	1286	*/
JMF	12:0071cb144c7a	1287	int mbedtls_rsa_rsassa_pss_verify( mbedtls_rsa_context *ctx,
JMF	12:0071cb144c7a	1288	int (f_rng)(void , unsigned char *, size_t),
JMF	12:0071cb144c7a	1289	void *p_rng,
JMF	12:0071cb144c7a	1290	int mode,
JMF	12:0071cb144c7a	1291	mbedtls_md_type_t md_alg,
JMF	12:0071cb144c7a	1292	unsigned int hashlen,
JMF	12:0071cb144c7a	1293	const unsigned char *hash,
JMF	12:0071cb144c7a	1294	const unsigned char *sig )
JMF	12:0071cb144c7a	1295	{
JMF	12:0071cb144c7a	1296	mbedtls_md_type_t mgf1_hash_id = ( ctx->hash_id != MBEDTLS_MD_NONE )
JMF	12:0071cb144c7a	1297	? (mbedtls_md_type_t) ctx->hash_id
JMF	12:0071cb144c7a	1298	: md_alg;
JMF	12:0071cb144c7a	1299
JMF	12:0071cb144c7a	1300	return( mbedtls_rsa_rsassa_pss_verify_ext( ctx, f_rng, p_rng, mode,
JMF	12:0071cb144c7a	1301	md_alg, hashlen, hash,
JMF	12:0071cb144c7a	1302	mgf1_hash_id, MBEDTLS_RSA_SALT_LEN_ANY,
JMF	12:0071cb144c7a	1303	sig ) );
JMF	12:0071cb144c7a	1304
JMF	12:0071cb144c7a	1305	}
JMF	12:0071cb144c7a	1306	#endif /* MBEDTLS_PKCS1_V21 */
JMF	12:0071cb144c7a	1307
JMF	12:0071cb144c7a	1308	#if defined(MBEDTLS_PKCS1_V15)
JMF	12:0071cb144c7a	1309	/*
JMF	12:0071cb144c7a	1310	* Implementation of the PKCS#1 v2.1 RSASSA-PKCS1-v1_5-VERIFY function
JMF	12:0071cb144c7a	1311	*/
JMF	12:0071cb144c7a	1312	int mbedtls_rsa_rsassa_pkcs1_v15_verify( mbedtls_rsa_context *ctx,
JMF	12:0071cb144c7a	1313	int (f_rng)(void , unsigned char *, size_t),
JMF	12:0071cb144c7a	1314	void *p_rng,
JMF	12:0071cb144c7a	1315	int mode,
JMF	12:0071cb144c7a	1316	mbedtls_md_type_t md_alg,
JMF	12:0071cb144c7a	1317	unsigned int hashlen,
JMF	12:0071cb144c7a	1318	const unsigned char *hash,
JMF	12:0071cb144c7a	1319	const unsigned char *sig )
JMF	12:0071cb144c7a	1320	{
JMF	12:0071cb144c7a	1321	int ret;
JMF	12:0071cb144c7a	1322	size_t len, siglen, asn1_len;
JMF	12:0071cb144c7a	1323	unsigned char p, end;
JMF	12:0071cb144c7a	1324	mbedtls_md_type_t msg_md_alg;
JMF	12:0071cb144c7a	1325	const mbedtls_md_info_t *md_info;
JMF	12:0071cb144c7a	1326	mbedtls_asn1_buf oid;
JMF	12:0071cb144c7a	1327	unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
JMF	12:0071cb144c7a	1328
JMF	12:0071cb144c7a	1329	if( mode == MBEDTLS_RSA_PRIVATE && ctx->padding != MBEDTLS_RSA_PKCS_V15 )
JMF	12:0071cb144c7a	1330	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
JMF	12:0071cb144c7a	1331
JMF	12:0071cb144c7a	1332	siglen = ctx->len;
JMF	12:0071cb144c7a	1333
JMF	12:0071cb144c7a	1334	if( siglen < 16 \|\| siglen > sizeof( buf ) )
JMF	12:0071cb144c7a	1335	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
JMF	12:0071cb144c7a	1336
JMF	12:0071cb144c7a	1337	ret = ( mode == MBEDTLS_RSA_PUBLIC )
JMF	12:0071cb144c7a	1338	? mbedtls_rsa_public( ctx, sig, buf )
JMF	12:0071cb144c7a	1339	: mbedtls_rsa_private( ctx, f_rng, p_rng, sig, buf );
JMF	12:0071cb144c7a	1340
JMF	12:0071cb144c7a	1341	if( ret != 0 )
JMF	12:0071cb144c7a	1342	return( ret );
JMF	12:0071cb144c7a	1343
JMF	12:0071cb144c7a	1344	p = buf;
JMF	12:0071cb144c7a	1345
JMF	12:0071cb144c7a	1346	if( p++ != 0 \|\| p++ != MBEDTLS_RSA_SIGN )
JMF	12:0071cb144c7a	1347	return( MBEDTLS_ERR_RSA_INVALID_PADDING );
JMF	12:0071cb144c7a	1348
JMF	12:0071cb144c7a	1349	while( *p != 0 )
JMF	12:0071cb144c7a	1350	{
JMF	12:0071cb144c7a	1351	if( p >= buf + siglen - 1 \|\| *p != 0xFF )
JMF	12:0071cb144c7a	1352	return( MBEDTLS_ERR_RSA_INVALID_PADDING );
JMF	12:0071cb144c7a	1353	p++;
JMF	12:0071cb144c7a	1354	}
JMF	12:0071cb144c7a	1355	p++;
JMF	12:0071cb144c7a	1356
JMF	12:0071cb144c7a	1357	len = siglen - ( p - buf );
JMF	12:0071cb144c7a	1358
JMF	12:0071cb144c7a	1359	if( len == hashlen && md_alg == MBEDTLS_MD_NONE )
JMF	12:0071cb144c7a	1360	{
JMF	12:0071cb144c7a	1361	if( memcmp( p, hash, hashlen ) == 0 )
JMF	12:0071cb144c7a	1362	return( 0 );
JMF	12:0071cb144c7a	1363	else
JMF	12:0071cb144c7a	1364	return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
JMF	12:0071cb144c7a	1365	}
JMF	12:0071cb144c7a	1366
JMF	12:0071cb144c7a	1367	md_info = mbedtls_md_info_from_type( md_alg );
JMF	12:0071cb144c7a	1368	if( md_info == NULL )
JMF	12:0071cb144c7a	1369	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
JMF	12:0071cb144c7a	1370	hashlen = mbedtls_md_get_size( md_info );
JMF	12:0071cb144c7a	1371
JMF	12:0071cb144c7a	1372	end = p + len;
JMF	12:0071cb144c7a	1373
JMF	12:0071cb144c7a	1374	/*
JMF	12:0071cb144c7a	1375	* Parse the ASN.1 structure inside the PKCS#1 v1.5 structure
JMF	12:0071cb144c7a	1376	*/
JMF	12:0071cb144c7a	1377	if( ( ret = mbedtls_asn1_get_tag( &p, end, &asn1_len,
JMF	12:0071cb144c7a	1378	MBEDTLS_ASN1_CONSTRUCTED \| MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
JMF	12:0071cb144c7a	1379	return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
JMF	12:0071cb144c7a	1380
JMF	12:0071cb144c7a	1381	if( asn1_len + 2 != len )
JMF	12:0071cb144c7a	1382	return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
JMF	12:0071cb144c7a	1383
JMF	12:0071cb144c7a	1384	if( ( ret = mbedtls_asn1_get_tag( &p, end, &asn1_len,
JMF	12:0071cb144c7a	1385	MBEDTLS_ASN1_CONSTRUCTED \| MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
JMF	12:0071cb144c7a	1386	return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
JMF	12:0071cb144c7a	1387
JMF	12:0071cb144c7a	1388	if( asn1_len + 6 + hashlen != len )
JMF	12:0071cb144c7a	1389	return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
JMF	12:0071cb144c7a	1390
JMF	12:0071cb144c7a	1391	if( ( ret = mbedtls_asn1_get_tag( &p, end, &oid.len, MBEDTLS_ASN1_OID ) ) != 0 )
JMF	12:0071cb144c7a	1392	return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
JMF	12:0071cb144c7a	1393
JMF	12:0071cb144c7a	1394	oid.p = p;
JMF	12:0071cb144c7a	1395	p += oid.len;
JMF	12:0071cb144c7a	1396
JMF	12:0071cb144c7a	1397	if( mbedtls_oid_get_md_alg( &oid, &msg_md_alg ) != 0 )
JMF	12:0071cb144c7a	1398	return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
JMF	12:0071cb144c7a	1399
JMF	12:0071cb144c7a	1400	if( md_alg != msg_md_alg )
JMF	12:0071cb144c7a	1401	return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
JMF	12:0071cb144c7a	1402
JMF	12:0071cb144c7a	1403	/*
JMF	12:0071cb144c7a	1404	* assume the algorithm parameters must be NULL
JMF	12:0071cb144c7a	1405	*/
JMF	12:0071cb144c7a	1406	if( ( ret = mbedtls_asn1_get_tag( &p, end, &asn1_len, MBEDTLS_ASN1_NULL ) ) != 0 )
JMF	12:0071cb144c7a	1407	return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
JMF	12:0071cb144c7a	1408
JMF	12:0071cb144c7a	1409	if( ( ret = mbedtls_asn1_get_tag( &p, end, &asn1_len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
JMF	12:0071cb144c7a	1410	return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
JMF	12:0071cb144c7a	1411
JMF	12:0071cb144c7a	1412	if( asn1_len != hashlen )
JMF	12:0071cb144c7a	1413	return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
JMF	12:0071cb144c7a	1414
JMF	12:0071cb144c7a	1415	if( memcmp( p, hash, hashlen ) != 0 )
JMF	12:0071cb144c7a	1416	return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
JMF	12:0071cb144c7a	1417
JMF	12:0071cb144c7a	1418	p += hashlen;
JMF	12:0071cb144c7a	1419
JMF	12:0071cb144c7a	1420	if( p != end )
JMF	12:0071cb144c7a	1421	return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
JMF	12:0071cb144c7a	1422
JMF	12:0071cb144c7a	1423	return( 0 );
JMF	12:0071cb144c7a	1424	}
JMF	12:0071cb144c7a	1425	#endif /* MBEDTLS_PKCS1_V15 */
JMF	12:0071cb144c7a	1426
JMF	12:0071cb144c7a	1427	/*
JMF	12:0071cb144c7a	1428	* Do an RSA operation and check the message digest
JMF	12:0071cb144c7a	1429	*/
JMF	12:0071cb144c7a	1430	int mbedtls_rsa_pkcs1_verify( mbedtls_rsa_context *ctx,
JMF	12:0071cb144c7a	1431	int (f_rng)(void , unsigned char *, size_t),
JMF	12:0071cb144c7a	1432	void *p_rng,
JMF	12:0071cb144c7a	1433	int mode,
JMF	12:0071cb144c7a	1434	mbedtls_md_type_t md_alg,
JMF	12:0071cb144c7a	1435	unsigned int hashlen,
JMF	12:0071cb144c7a	1436	const unsigned char *hash,
JMF	12:0071cb144c7a	1437	const unsigned char *sig )
JMF	12:0071cb144c7a	1438	{
JMF	12:0071cb144c7a	1439	switch( ctx->padding )
JMF	12:0071cb144c7a	1440	{
JMF	12:0071cb144c7a	1441	#if defined(MBEDTLS_PKCS1_V15)
JMF	12:0071cb144c7a	1442	case MBEDTLS_RSA_PKCS_V15:
JMF	12:0071cb144c7a	1443	return mbedtls_rsa_rsassa_pkcs1_v15_verify( ctx, f_rng, p_rng, mode, md_alg,
JMF	12:0071cb144c7a	1444	hashlen, hash, sig );
JMF	12:0071cb144c7a	1445	#endif
JMF	12:0071cb144c7a	1446
JMF	12:0071cb144c7a	1447	#if defined(MBEDTLS_PKCS1_V21)
JMF	12:0071cb144c7a	1448	case MBEDTLS_RSA_PKCS_V21:
JMF	12:0071cb144c7a	1449	return mbedtls_rsa_rsassa_pss_verify( ctx, f_rng, p_rng, mode, md_alg,
JMF	12:0071cb144c7a	1450	hashlen, hash, sig );
JMF	12:0071cb144c7a	1451	#endif
JMF	12:0071cb144c7a	1452
JMF	12:0071cb144c7a	1453	default:
JMF	12:0071cb144c7a	1454	return( MBEDTLS_ERR_RSA_INVALID_PADDING );
JMF	12:0071cb144c7a	1455	}
JMF	12:0071cb144c7a	1456	}
JMF	12:0071cb144c7a	1457
JMF	12:0071cb144c7a	1458	/*
JMF	12:0071cb144c7a	1459	* Copy the components of an RSA key
JMF	12:0071cb144c7a	1460	*/
JMF	12:0071cb144c7a	1461	int mbedtls_rsa_copy( mbedtls_rsa_context dst, const mbedtls_rsa_context src )
JMF	12:0071cb144c7a	1462	{
JMF	12:0071cb144c7a	1463	int ret;
JMF	12:0071cb144c7a	1464
JMF	12:0071cb144c7a	1465	dst->ver = src->ver;
JMF	12:0071cb144c7a	1466	dst->len = src->len;
JMF	12:0071cb144c7a	1467
JMF	12:0071cb144c7a	1468	MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->N, &src->N ) );
JMF	12:0071cb144c7a	1469	MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->E, &src->E ) );
JMF	12:0071cb144c7a	1470
JMF	12:0071cb144c7a	1471	MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->D, &src->D ) );
JMF	12:0071cb144c7a	1472	MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->P, &src->P ) );
JMF	12:0071cb144c7a	1473	MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->Q, &src->Q ) );
JMF	12:0071cb144c7a	1474	MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->DP, &src->DP ) );
JMF	12:0071cb144c7a	1475	MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->DQ, &src->DQ ) );
JMF	12:0071cb144c7a	1476	MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->QP, &src->QP ) );
JMF	12:0071cb144c7a	1477
JMF	12:0071cb144c7a	1478	MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->RN, &src->RN ) );
JMF	12:0071cb144c7a	1479	MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->RP, &src->RP ) );
JMF	12:0071cb144c7a	1480	MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->RQ, &src->RQ ) );
JMF	12:0071cb144c7a	1481
JMF	12:0071cb144c7a	1482	MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->Vi, &src->Vi ) );
JMF	12:0071cb144c7a	1483	MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->Vf, &src->Vf ) );
JMF	12:0071cb144c7a	1484
JMF	12:0071cb144c7a	1485	dst->padding = src->padding;
JMF	12:0071cb144c7a	1486	dst->hash_id = src->hash_id;
JMF	12:0071cb144c7a	1487
JMF	12:0071cb144c7a	1488	cleanup:
JMF	12:0071cb144c7a	1489	if( ret != 0 )
JMF	12:0071cb144c7a	1490	mbedtls_rsa_free( dst );
JMF	12:0071cb144c7a	1491
JMF	12:0071cb144c7a	1492	return( ret );
JMF	12:0071cb144c7a	1493	}
JMF	12:0071cb144c7a	1494
JMF	12:0071cb144c7a	1495	/*
JMF	12:0071cb144c7a	1496	* Free the components of an RSA key
JMF	12:0071cb144c7a	1497	*/
JMF	12:0071cb144c7a	1498	void mbedtls_rsa_free( mbedtls_rsa_context *ctx )
JMF	12:0071cb144c7a	1499	{
JMF	12:0071cb144c7a	1500	mbedtls_mpi_free( &ctx->Vi ); mbedtls_mpi_free( &ctx->Vf );
JMF	12:0071cb144c7a	1501	mbedtls_mpi_free( &ctx->RQ ); mbedtls_mpi_free( &ctx->RP ); mbedtls_mpi_free( &ctx->RN );
JMF	12:0071cb144c7a	1502	mbedtls_mpi_free( &ctx->QP ); mbedtls_mpi_free( &ctx->DQ ); mbedtls_mpi_free( &ctx->DP );
JMF	12:0071cb144c7a	1503	mbedtls_mpi_free( &ctx->Q ); mbedtls_mpi_free( &ctx->P ); mbedtls_mpi_free( &ctx->D );
JMF	12:0071cb144c7a	1504	mbedtls_mpi_free( &ctx->E ); mbedtls_mpi_free( &ctx->N );
JMF	12:0071cb144c7a	1505
JMF	12:0071cb144c7a	1506	#if defined(MBEDTLS_THREADING_C)
JMF	12:0071cb144c7a	1507	mbedtls_mutex_free( &ctx->mutex );
JMF	12:0071cb144c7a	1508	#endif
JMF	12:0071cb144c7a	1509	}
JMF	12:0071cb144c7a	1510
JMF	12:0071cb144c7a	1511	#if defined(MBEDTLS_SELF_TEST)
JMF	12:0071cb144c7a	1512
JMF	12:0071cb144c7a	1513	#include "mbedtls/sha1.h"
JMF	12:0071cb144c7a	1514
JMF	12:0071cb144c7a	1515	/*
JMF	12:0071cb144c7a	1516	* Example RSA-1024 keypair, for test purposes
JMF	12:0071cb144c7a	1517	*/
JMF	12:0071cb144c7a	1518	#define KEY_LEN 128
JMF	12:0071cb144c7a	1519
JMF	12:0071cb144c7a	1520	#define RSA_N "9292758453063D803DD603D5E777D788" \
JMF	12:0071cb144c7a	1521	"8ED1D5BF35786190FA2F23EBC0848AEA" \
JMF	12:0071cb144c7a	1522	"DDA92CA6C3D80B32C4D109BE0F36D6AE" \
JMF	12:0071cb144c7a	1523	"7130B9CED7ACDF54CFC7555AC14EEBAB" \
JMF	12:0071cb144c7a	1524	"93A89813FBF3C4F8066D2D800F7C38A8" \
JMF	12:0071cb144c7a	1525	"1AE31942917403FF4946B0A83D3D3E05" \
JMF	12:0071cb144c7a	1526	"EE57C6F5F5606FB5D4BC6CD34EE0801A" \
JMF	12:0071cb144c7a	1527	"5E94BB77B07507233A0BC7BAC8F90F79"
JMF	12:0071cb144c7a	1528
JMF	12:0071cb144c7a	1529	#define RSA_E "10001"
JMF	12:0071cb144c7a	1530
JMF	12:0071cb144c7a	1531	#define RSA_D "24BF6185468786FDD303083D25E64EFC" \
JMF	12:0071cb144c7a	1532	"66CA472BC44D253102F8B4A9D3BFA750" \
JMF	12:0071cb144c7a	1533	"91386C0077937FE33FA3252D28855837" \
JMF	12:0071cb144c7a	1534	"AE1B484A8A9A45F7EE8C0C634F99E8CD" \
JMF	12:0071cb144c7a	1535	"DF79C5CE07EE72C7F123142198164234" \
JMF	12:0071cb144c7a	1536	"CABB724CF78B8173B9F880FC86322407" \
JMF	12:0071cb144c7a	1537	"AF1FEDFDDE2BEB674CA15F3E81A1521E" \
JMF	12:0071cb144c7a	1538	"071513A1E85B5DFA031F21ECAE91A34D"
JMF	12:0071cb144c7a	1539
JMF	12:0071cb144c7a	1540	#define RSA_P "C36D0EB7FCD285223CFB5AABA5BDA3D8" \
JMF	12:0071cb144c7a	1541	"2C01CAD19EA484A87EA4377637E75500" \
JMF	12:0071cb144c7a	1542	"FCB2005C5C7DD6EC4AC023CDA285D796" \
JMF	12:0071cb144c7a	1543	"C3D9E75E1EFC42488BB4F1D13AC30A57"
JMF	12:0071cb144c7a	1544
JMF	12:0071cb144c7a	1545	#define RSA_Q "C000DF51A7C77AE8D7C7370C1FF55B69" \
JMF	12:0071cb144c7a	1546	"E211C2B9E5DB1ED0BF61D0D9899620F4" \
JMF	12:0071cb144c7a	1547	"910E4168387E3C30AA1E00C339A79508" \
JMF	12:0071cb144c7a	1548	"8452DD96A9A5EA5D9DCA68DA636032AF"
JMF	12:0071cb144c7a	1549
JMF	12:0071cb144c7a	1550	#define RSA_DP "C1ACF567564274FB07A0BBAD5D26E298" \
JMF	12:0071cb144c7a	1551	"3C94D22288ACD763FD8E5600ED4A702D" \
JMF	12:0071cb144c7a	1552	"F84198A5F06C2E72236AE490C93F07F8" \
JMF	12:0071cb144c7a	1553	"3CC559CD27BC2D1CA488811730BB5725"
JMF	12:0071cb144c7a	1554
JMF	12:0071cb144c7a	1555	#define RSA_DQ "4959CBF6F8FEF750AEE6977C155579C7" \
JMF	12:0071cb144c7a	1556	"D8AAEA56749EA28623272E4F7D0592AF" \
JMF	12:0071cb144c7a	1557	"7C1F1313CAC9471B5C523BFE592F517B" \
JMF	12:0071cb144c7a	1558	"407A1BD76C164B93DA2D32A383E58357"
JMF	12:0071cb144c7a	1559
JMF	12:0071cb144c7a	1560	#define RSA_QP "9AE7FBC99546432DF71896FC239EADAE" \
JMF	12:0071cb144c7a	1561	"F38D18D2B2F0E2DD275AA977E2BF4411" \
JMF	12:0071cb144c7a	1562	"F5A3B2A5D33605AEBBCCBA7FEB9F2D2F" \
JMF	12:0071cb144c7a	1563	"A74206CEC169D74BF5A8C50D6F48EA08"
JMF	12:0071cb144c7a	1564
JMF	12:0071cb144c7a	1565	#define PT_LEN 24
JMF	12:0071cb144c7a	1566	#define RSA_PT "\xAA\xBB\xCC\x03\x02\x01\x00\xFF\xFF\xFF\xFF\xFF" \
JMF	12:0071cb144c7a	1567	"\x11\x22\x33\x0A\x0B\x0C\xCC\xDD\xDD\xDD\xDD\xDD"
JMF	12:0071cb144c7a	1568
JMF	12:0071cb144c7a	1569	#if defined(MBEDTLS_PKCS1_V15)
JMF	12:0071cb144c7a	1570	static int myrand( void rng_state, unsigned char output, size_t len )
JMF	12:0071cb144c7a	1571	{
JMF	12:0071cb144c7a	1572	#if !defined(__OpenBSD__)
JMF	12:0071cb144c7a	1573	size_t i;
JMF	12:0071cb144c7a	1574
JMF	12:0071cb144c7a	1575	if( rng_state != NULL )
JMF	12:0071cb144c7a	1576	rng_state = NULL;
JMF	12:0071cb144c7a	1577
JMF	12:0071cb144c7a	1578	for( i = 0; i < len; ++i )
JMF	12:0071cb144c7a	1579	output[i] = rand();
JMF	12:0071cb144c7a	1580	#else
JMF	12:0071cb144c7a	1581	if( rng_state != NULL )
JMF	12:0071cb144c7a	1582	rng_state = NULL;
JMF	12:0071cb144c7a	1583
JMF	12:0071cb144c7a	1584	arc4random_buf( output, len );
JMF	12:0071cb144c7a	1585	#endif /* !OpenBSD */
JMF	12:0071cb144c7a	1586
JMF	12:0071cb144c7a	1587	return( 0 );
JMF	12:0071cb144c7a	1588	}
JMF	12:0071cb144c7a	1589	#endif /* MBEDTLS_PKCS1_V15 */
JMF	12:0071cb144c7a	1590
JMF	12:0071cb144c7a	1591	/*
JMF	12:0071cb144c7a	1592	* Checkup routine
JMF	12:0071cb144c7a	1593	*/
JMF	12:0071cb144c7a	1594	int mbedtls_rsa_self_test( int verbose )
JMF	12:0071cb144c7a	1595	{
JMF	12:0071cb144c7a	1596	int ret = 0;
JMF	12:0071cb144c7a	1597	#if defined(MBEDTLS_PKCS1_V15)
JMF	12:0071cb144c7a	1598	size_t len;
JMF	12:0071cb144c7a	1599	mbedtls_rsa_context rsa;
JMF	12:0071cb144c7a	1600	unsigned char rsa_plaintext[PT_LEN];
JMF	12:0071cb144c7a	1601	unsigned char rsa_decrypted[PT_LEN];
JMF	12:0071cb144c7a	1602	unsigned char rsa_ciphertext[KEY_LEN];
JMF	12:0071cb144c7a	1603	#if defined(MBEDTLS_SHA1_C)
JMF	12:0071cb144c7a	1604	unsigned char sha1sum[20];
JMF	12:0071cb144c7a	1605	#endif
JMF	12:0071cb144c7a	1606
JMF	12:0071cb144c7a	1607	mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, 0 );
JMF	12:0071cb144c7a	1608
JMF	12:0071cb144c7a	1609	rsa.len = KEY_LEN;
JMF	12:0071cb144c7a	1610	MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &rsa.N , 16, RSA_N ) );
JMF	12:0071cb144c7a	1611	MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &rsa.E , 16, RSA_E ) );
JMF	12:0071cb144c7a	1612	MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &rsa.D , 16, RSA_D ) );
JMF	12:0071cb144c7a	1613	MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &rsa.P , 16, RSA_P ) );
JMF	12:0071cb144c7a	1614	MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &rsa.Q , 16, RSA_Q ) );
JMF	12:0071cb144c7a	1615	MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &rsa.DP, 16, RSA_DP ) );
JMF	12:0071cb144c7a	1616	MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &rsa.DQ, 16, RSA_DQ ) );
JMF	12:0071cb144c7a	1617	MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &rsa.QP, 16, RSA_QP ) );
JMF	12:0071cb144c7a	1618
JMF	12:0071cb144c7a	1619	if( verbose != 0 )
JMF	12:0071cb144c7a	1620	mbedtls_printf( " RSA key validation: " );
JMF	12:0071cb144c7a	1621
JMF	12:0071cb144c7a	1622	if( mbedtls_rsa_check_pubkey( &rsa ) != 0 \|\|
JMF	12:0071cb144c7a	1623	mbedtls_rsa_check_privkey( &rsa ) != 0 )
JMF	12:0071cb144c7a	1624	{
JMF	12:0071cb144c7a	1625	if( verbose != 0 )
JMF	12:0071cb144c7a	1626	mbedtls_printf( "failed\n" );
JMF	12:0071cb144c7a	1627
JMF	12:0071cb144c7a	1628	return( 1 );
JMF	12:0071cb144c7a	1629	}
JMF	12:0071cb144c7a	1630
JMF	12:0071cb144c7a	1631	if( verbose != 0 )
JMF	12:0071cb144c7a	1632	mbedtls_printf( "passed\n PKCS#1 encryption : " );
JMF	12:0071cb144c7a	1633
JMF	12:0071cb144c7a	1634	memcpy( rsa_plaintext, RSA_PT, PT_LEN );
JMF	12:0071cb144c7a	1635
JMF	12:0071cb144c7a	1636	if( mbedtls_rsa_pkcs1_encrypt( &rsa, myrand, NULL, MBEDTLS_RSA_PUBLIC, PT_LEN,
JMF	12:0071cb144c7a	1637	rsa_plaintext, rsa_ciphertext ) != 0 )
JMF	12:0071cb144c7a	1638	{
JMF	12:0071cb144c7a	1639	if( verbose != 0 )
JMF	12:0071cb144c7a	1640	mbedtls_printf( "failed\n" );
JMF	12:0071cb144c7a	1641
JMF	12:0071cb144c7a	1642	return( 1 );
JMF	12:0071cb144c7a	1643	}
JMF	12:0071cb144c7a	1644
JMF	12:0071cb144c7a	1645	if( verbose != 0 )
JMF	12:0071cb144c7a	1646	mbedtls_printf( "passed\n PKCS#1 decryption : " );
JMF	12:0071cb144c7a	1647
JMF	12:0071cb144c7a	1648	if( mbedtls_rsa_pkcs1_decrypt( &rsa, myrand, NULL, MBEDTLS_RSA_PRIVATE, &len,
JMF	12:0071cb144c7a	1649	rsa_ciphertext, rsa_decrypted,
JMF	12:0071cb144c7a	1650	sizeof(rsa_decrypted) ) != 0 )
JMF	12:0071cb144c7a	1651	{
JMF	12:0071cb144c7a	1652	if( verbose != 0 )
JMF	12:0071cb144c7a	1653	mbedtls_printf( "failed\n" );
JMF	12:0071cb144c7a	1654
JMF	12:0071cb144c7a	1655	return( 1 );
JMF	12:0071cb144c7a	1656	}
JMF	12:0071cb144c7a	1657
JMF	12:0071cb144c7a	1658	if( memcmp( rsa_decrypted, rsa_plaintext, len ) != 0 )
JMF	12:0071cb144c7a	1659	{
JMF	12:0071cb144c7a	1660	if( verbose != 0 )
JMF	12:0071cb144c7a	1661	mbedtls_printf( "failed\n" );
JMF	12:0071cb144c7a	1662
JMF	12:0071cb144c7a	1663	return( 1 );
JMF	12:0071cb144c7a	1664	}
JMF	12:0071cb144c7a	1665
JMF	12:0071cb144c7a	1666	if( verbose != 0 )
JMF	12:0071cb144c7a	1667	mbedtls_printf( "passed\n" );
JMF	12:0071cb144c7a	1668
JMF	12:0071cb144c7a	1669	#if defined(MBEDTLS_SHA1_C)
JMF	12:0071cb144c7a	1670	if( verbose != 0 )
JMF	12:0071cb144c7a	1671	mbedtls_printf( " PKCS#1 data sign : " );
JMF	12:0071cb144c7a	1672
JMF	12:0071cb144c7a	1673	mbedtls_sha1( rsa_plaintext, PT_LEN, sha1sum );
JMF	12:0071cb144c7a	1674
JMF	12:0071cb144c7a	1675	if( mbedtls_rsa_pkcs1_sign( &rsa, myrand, NULL, MBEDTLS_RSA_PRIVATE, MBEDTLS_MD_SHA1, 0,
JMF	12:0071cb144c7a	1676	sha1sum, rsa_ciphertext ) != 0 )
JMF	12:0071cb144c7a	1677	{
JMF	12:0071cb144c7a	1678	if( verbose != 0 )
JMF	12:0071cb144c7a	1679	mbedtls_printf( "failed\n" );
JMF	12:0071cb144c7a	1680
JMF	12:0071cb144c7a	1681	return( 1 );
JMF	12:0071cb144c7a	1682	}
JMF	12:0071cb144c7a	1683
JMF	12:0071cb144c7a	1684	if( verbose != 0 )
JMF	12:0071cb144c7a	1685	mbedtls_printf( "passed\n PKCS#1 sig. verify: " );
JMF	12:0071cb144c7a	1686
JMF	12:0071cb144c7a	1687	if( mbedtls_rsa_pkcs1_verify( &rsa, NULL, NULL, MBEDTLS_RSA_PUBLIC, MBEDTLS_MD_SHA1, 0,
JMF	12:0071cb144c7a	1688	sha1sum, rsa_ciphertext ) != 0 )
JMF	12:0071cb144c7a	1689	{
JMF	12:0071cb144c7a	1690	if( verbose != 0 )
JMF	12:0071cb144c7a	1691	mbedtls_printf( "failed\n" );
JMF	12:0071cb144c7a	1692
JMF	12:0071cb144c7a	1693	return( 1 );
JMF	12:0071cb144c7a	1694	}
JMF	12:0071cb144c7a	1695
JMF	12:0071cb144c7a	1696	if( verbose != 0 )
JMF	12:0071cb144c7a	1697	mbedtls_printf( "passed\n" );
JMF	12:0071cb144c7a	1698	#endif /* MBEDTLS_SHA1_C */
JMF	12:0071cb144c7a	1699
JMF	12:0071cb144c7a	1700	if( verbose != 0 )
JMF	12:0071cb144c7a	1701	mbedtls_printf( "\n" );
JMF	12:0071cb144c7a	1702
JMF	12:0071cb144c7a	1703	cleanup:
JMF	12:0071cb144c7a	1704	mbedtls_rsa_free( &rsa );
JMF	12:0071cb144c7a	1705	#else /* MBEDTLS_PKCS1_V15 */
JMF	12:0071cb144c7a	1706	((void) verbose);
JMF	12:0071cb144c7a	1707	#endif /* MBEDTLS_PKCS1_V15 */
JMF	12:0071cb144c7a	1708	return( ret );
JMF	12:0071cb144c7a	1709	}
JMF	12:0071cb144c7a	1710
JMF	12:0071cb144c7a	1711	#endif /* MBEDTLS_SELF_TEST */
JMF	12:0071cb144c7a	1712
JMF	12:0071cb144c7a	1713	#endif /* MBEDTLS_RSA_C */

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Type:	Program
Created:	18 Apr 2019
Imports:	0
Forks:	0
Commits:	32
Dependents:	0
Dependencies:	1
Followers:	1

mbedtls/source/rsa.c@12:0071cb144c7a, 2016-11-01 (annotated)

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