Marco Zecchini / Mbed OS Example_RTOS

Rtos API example

mbed-os/features/mbedtls/src/pkparse.c@0:9fca2b23d0ba, 2019-02-23 (annotated)

Committer:
marcozecchini
Date:
Sat Feb 23 12:13:36 2019 +0000
Revision:
0:9fca2b23d0ba
final commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
marcozecchini 0:9fca2b23d0ba 1 /*
marcozecchini 0:9fca2b23d0ba 2 * Public Key layer for parsing key files and structures
marcozecchini 0:9fca2b23d0ba 3 *
marcozecchini 0:9fca2b23d0ba 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
marcozecchini 0:9fca2b23d0ba 5 * SPDX-License-Identifier: Apache-2.0
marcozecchini 0:9fca2b23d0ba 6 *
marcozecchini 0:9fca2b23d0ba 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
marcozecchini 0:9fca2b23d0ba 8 * not use this file except in compliance with the License.
marcozecchini 0:9fca2b23d0ba 9 * You may obtain a copy of the License at
marcozecchini 0:9fca2b23d0ba 10 *
marcozecchini 0:9fca2b23d0ba 11 * http://www.apache.org/licenses/LICENSE-2.0
marcozecchini 0:9fca2b23d0ba 12 *
marcozecchini 0:9fca2b23d0ba 13 * Unless required by applicable law or agreed to in writing, software
marcozecchini 0:9fca2b23d0ba 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
marcozecchini 0:9fca2b23d0ba 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
marcozecchini 0:9fca2b23d0ba 16 * See the License for the specific language governing permissions and
marcozecchini 0:9fca2b23d0ba 17 * limitations under the License.
marcozecchini 0:9fca2b23d0ba 18 *
marcozecchini 0:9fca2b23d0ba 19 * This file is part of mbed TLS (https://tls.mbed.org)
marcozecchini 0:9fca2b23d0ba 20 */
marcozecchini 0:9fca2b23d0ba 21
marcozecchini 0:9fca2b23d0ba 22 #if !defined(MBEDTLS_CONFIG_FILE)
marcozecchini 0:9fca2b23d0ba 23 #include "mbedtls/config.h"
marcozecchini 0:9fca2b23d0ba 24 #else
marcozecchini 0:9fca2b23d0ba 25 #include MBEDTLS_CONFIG_FILE
marcozecchini 0:9fca2b23d0ba 26 #endif
marcozecchini 0:9fca2b23d0ba 27
marcozecchini 0:9fca2b23d0ba 28 #if defined(MBEDTLS_PK_PARSE_C)
marcozecchini 0:9fca2b23d0ba 29
marcozecchini 0:9fca2b23d0ba 30 #include "mbedtls/pk.h"
marcozecchini 0:9fca2b23d0ba 31 #include "mbedtls/asn1.h"
marcozecchini 0:9fca2b23d0ba 32 #include "mbedtls/oid.h"
marcozecchini 0:9fca2b23d0ba 33
marcozecchini 0:9fca2b23d0ba 34 #include <string.h>
marcozecchini 0:9fca2b23d0ba 35
marcozecchini 0:9fca2b23d0ba 36 #if defined(MBEDTLS_RSA_C)
marcozecchini 0:9fca2b23d0ba 37 #include "mbedtls/rsa.h"
marcozecchini 0:9fca2b23d0ba 38 #endif
marcozecchini 0:9fca2b23d0ba 39 #if defined(MBEDTLS_ECP_C)
marcozecchini 0:9fca2b23d0ba 40 #include "mbedtls/ecp.h"
marcozecchini 0:9fca2b23d0ba 41 #endif
marcozecchini 0:9fca2b23d0ba 42 #if defined(MBEDTLS_ECDSA_C)
marcozecchini 0:9fca2b23d0ba 43 #include "mbedtls/ecdsa.h"
marcozecchini 0:9fca2b23d0ba 44 #endif
marcozecchini 0:9fca2b23d0ba 45 #if defined(MBEDTLS_PEM_PARSE_C)
marcozecchini 0:9fca2b23d0ba 46 #include "mbedtls/pem.h"
marcozecchini 0:9fca2b23d0ba 47 #endif
marcozecchini 0:9fca2b23d0ba 48 #if defined(MBEDTLS_PKCS5_C)
marcozecchini 0:9fca2b23d0ba 49 #include "mbedtls/pkcs5.h"
marcozecchini 0:9fca2b23d0ba 50 #endif
marcozecchini 0:9fca2b23d0ba 51 #if defined(MBEDTLS_PKCS12_C)
marcozecchini 0:9fca2b23d0ba 52 #include "mbedtls/pkcs12.h"
marcozecchini 0:9fca2b23d0ba 53 #endif
marcozecchini 0:9fca2b23d0ba 54
marcozecchini 0:9fca2b23d0ba 55 #if defined(MBEDTLS_PLATFORM_C)
marcozecchini 0:9fca2b23d0ba 56 #include "mbedtls/platform.h"
marcozecchini 0:9fca2b23d0ba 57 #else
marcozecchini 0:9fca2b23d0ba 58 #include <stdlib.h>
marcozecchini 0:9fca2b23d0ba 59 #define mbedtls_calloc calloc
marcozecchini 0:9fca2b23d0ba 60 #define mbedtls_free free
marcozecchini 0:9fca2b23d0ba 61 #endif
marcozecchini 0:9fca2b23d0ba 62
marcozecchini 0:9fca2b23d0ba 63 #if defined(MBEDTLS_FS_IO)
marcozecchini 0:9fca2b23d0ba 64 /* Implementation that should never be optimized out by the compiler */
marcozecchini 0:9fca2b23d0ba 65 static void mbedtls_zeroize( void *v, size_t n ) {
marcozecchini 0:9fca2b23d0ba 66 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
marcozecchini 0:9fca2b23d0ba 67 }
marcozecchini 0:9fca2b23d0ba 68
marcozecchini 0:9fca2b23d0ba 69 /*
marcozecchini 0:9fca2b23d0ba 70 * Load all data from a file into a given buffer.
marcozecchini 0:9fca2b23d0ba 71 *
marcozecchini 0:9fca2b23d0ba 72 * The file is expected to contain either PEM or DER encoded data.
marcozecchini 0:9fca2b23d0ba 73 * A terminating null byte is always appended. It is included in the announced
marcozecchini 0:9fca2b23d0ba 74 * length only if the data looks like it is PEM encoded.
marcozecchini 0:9fca2b23d0ba 75 */
marcozecchini 0:9fca2b23d0ba 76 int mbedtls_pk_load_file( const char *path, unsigned char **buf, size_t *n )
marcozecchini 0:9fca2b23d0ba 77 {
marcozecchini 0:9fca2b23d0ba 78 FILE *f;
marcozecchini 0:9fca2b23d0ba 79 long size;
marcozecchini 0:9fca2b23d0ba 80
marcozecchini 0:9fca2b23d0ba 81 if( ( f = fopen( path, "rb" ) ) == NULL )
marcozecchini 0:9fca2b23d0ba 82 return( MBEDTLS_ERR_PK_FILE_IO_ERROR );
marcozecchini 0:9fca2b23d0ba 83
marcozecchini 0:9fca2b23d0ba 84 fseek( f, 0, SEEK_END );
marcozecchini 0:9fca2b23d0ba 85 if( ( size = ftell( f ) ) == -1 )
marcozecchini 0:9fca2b23d0ba 86 {
marcozecchini 0:9fca2b23d0ba 87 fclose( f );
marcozecchini 0:9fca2b23d0ba 88 return( MBEDTLS_ERR_PK_FILE_IO_ERROR );
marcozecchini 0:9fca2b23d0ba 89 }
marcozecchini 0:9fca2b23d0ba 90 fseek( f, 0, SEEK_SET );
marcozecchini 0:9fca2b23d0ba 91
marcozecchini 0:9fca2b23d0ba 92 *n = (size_t) size;
marcozecchini 0:9fca2b23d0ba 93
marcozecchini 0:9fca2b23d0ba 94 if( *n + 1 == 0 ||
marcozecchini 0:9fca2b23d0ba 95 ( *buf = mbedtls_calloc( 1, *n + 1 ) ) == NULL )
marcozecchini 0:9fca2b23d0ba 96 {
marcozecchini 0:9fca2b23d0ba 97 fclose( f );
marcozecchini 0:9fca2b23d0ba 98 return( MBEDTLS_ERR_PK_ALLOC_FAILED );
marcozecchini 0:9fca2b23d0ba 99 }
marcozecchini 0:9fca2b23d0ba 100
marcozecchini 0:9fca2b23d0ba 101 if( fread( *buf, 1, *n, f ) != *n )
marcozecchini 0:9fca2b23d0ba 102 {
marcozecchini 0:9fca2b23d0ba 103 fclose( f );
marcozecchini 0:9fca2b23d0ba 104 mbedtls_free( *buf );
marcozecchini 0:9fca2b23d0ba 105 return( MBEDTLS_ERR_PK_FILE_IO_ERROR );
marcozecchini 0:9fca2b23d0ba 106 }
marcozecchini 0:9fca2b23d0ba 107
marcozecchini 0:9fca2b23d0ba 108 fclose( f );
marcozecchini 0:9fca2b23d0ba 109
marcozecchini 0:9fca2b23d0ba 110 (*buf)[*n] = '\0';
marcozecchini 0:9fca2b23d0ba 111
marcozecchini 0:9fca2b23d0ba 112 if( strstr( (const char *) *buf, "-----BEGIN " ) != NULL )
marcozecchini 0:9fca2b23d0ba 113 ++*n;
marcozecchini 0:9fca2b23d0ba 114
marcozecchini 0:9fca2b23d0ba 115 return( 0 );
marcozecchini 0:9fca2b23d0ba 116 }
marcozecchini 0:9fca2b23d0ba 117
marcozecchini 0:9fca2b23d0ba 118 /*
marcozecchini 0:9fca2b23d0ba 119 * Load and parse a private key
marcozecchini 0:9fca2b23d0ba 120 */
marcozecchini 0:9fca2b23d0ba 121 int mbedtls_pk_parse_keyfile( mbedtls_pk_context *ctx,
marcozecchini 0:9fca2b23d0ba 122 const char *path, const char *pwd )
marcozecchini 0:9fca2b23d0ba 123 {
marcozecchini 0:9fca2b23d0ba 124 int ret;
marcozecchini 0:9fca2b23d0ba 125 size_t n;
marcozecchini 0:9fca2b23d0ba 126 unsigned char *buf;
marcozecchini 0:9fca2b23d0ba 127
marcozecchini 0:9fca2b23d0ba 128 if( ( ret = mbedtls_pk_load_file( path, &buf, &n ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 129 return( ret );
marcozecchini 0:9fca2b23d0ba 130
marcozecchini 0:9fca2b23d0ba 131 if( pwd == NULL )
marcozecchini 0:9fca2b23d0ba 132 ret = mbedtls_pk_parse_key( ctx, buf, n, NULL, 0 );
marcozecchini 0:9fca2b23d0ba 133 else
marcozecchini 0:9fca2b23d0ba 134 ret = mbedtls_pk_parse_key( ctx, buf, n,
marcozecchini 0:9fca2b23d0ba 135 (const unsigned char *) pwd, strlen( pwd ) );
marcozecchini 0:9fca2b23d0ba 136
marcozecchini 0:9fca2b23d0ba 137 mbedtls_zeroize( buf, n );
marcozecchini 0:9fca2b23d0ba 138 mbedtls_free( buf );
marcozecchini 0:9fca2b23d0ba 139
marcozecchini 0:9fca2b23d0ba 140 return( ret );
marcozecchini 0:9fca2b23d0ba 141 }
marcozecchini 0:9fca2b23d0ba 142
marcozecchini 0:9fca2b23d0ba 143 /*
marcozecchini 0:9fca2b23d0ba 144 * Load and parse a public key
marcozecchini 0:9fca2b23d0ba 145 */
marcozecchini 0:9fca2b23d0ba 146 int mbedtls_pk_parse_public_keyfile( mbedtls_pk_context *ctx, const char *path )
marcozecchini 0:9fca2b23d0ba 147 {
marcozecchini 0:9fca2b23d0ba 148 int ret;
marcozecchini 0:9fca2b23d0ba 149 size_t n;
marcozecchini 0:9fca2b23d0ba 150 unsigned char *buf;
marcozecchini 0:9fca2b23d0ba 151
marcozecchini 0:9fca2b23d0ba 152 if( ( ret = mbedtls_pk_load_file( path, &buf, &n ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 153 return( ret );
marcozecchini 0:9fca2b23d0ba 154
marcozecchini 0:9fca2b23d0ba 155 ret = mbedtls_pk_parse_public_key( ctx, buf, n );
marcozecchini 0:9fca2b23d0ba 156
marcozecchini 0:9fca2b23d0ba 157 mbedtls_zeroize( buf, n );
marcozecchini 0:9fca2b23d0ba 158 mbedtls_free( buf );
marcozecchini 0:9fca2b23d0ba 159
marcozecchini 0:9fca2b23d0ba 160 return( ret );
marcozecchini 0:9fca2b23d0ba 161 }
marcozecchini 0:9fca2b23d0ba 162 #endif /* MBEDTLS_FS_IO */
marcozecchini 0:9fca2b23d0ba 163
marcozecchini 0:9fca2b23d0ba 164 #if defined(MBEDTLS_ECP_C)
marcozecchini 0:9fca2b23d0ba 165 /* Minimally parse an ECParameters buffer to and mbedtls_asn1_buf
marcozecchini 0:9fca2b23d0ba 166 *
marcozecchini 0:9fca2b23d0ba 167 * ECParameters ::= CHOICE {
marcozecchini 0:9fca2b23d0ba 168 * namedCurve OBJECT IDENTIFIER
marcozecchini 0:9fca2b23d0ba 169 * specifiedCurve SpecifiedECDomain -- = SEQUENCE { ... }
marcozecchini 0:9fca2b23d0ba 170 * -- implicitCurve NULL
marcozecchini 0:9fca2b23d0ba 171 * }
marcozecchini 0:9fca2b23d0ba 172 */
marcozecchini 0:9fca2b23d0ba 173 static int pk_get_ecparams( unsigned char **p, const unsigned char *end,
marcozecchini 0:9fca2b23d0ba 174 mbedtls_asn1_buf *params )
marcozecchini 0:9fca2b23d0ba 175 {
marcozecchini 0:9fca2b23d0ba 176 int ret;
marcozecchini 0:9fca2b23d0ba 177
marcozecchini 0:9fca2b23d0ba 178 /* Tag may be either OID or SEQUENCE */
marcozecchini 0:9fca2b23d0ba 179 params->tag = **p;
marcozecchini 0:9fca2b23d0ba 180 if( params->tag != MBEDTLS_ASN1_OID
marcozecchini 0:9fca2b23d0ba 181 #if defined(MBEDTLS_PK_PARSE_EC_EXTENDED)
marcozecchini 0:9fca2b23d0ba 182 && params->tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE )
marcozecchini 0:9fca2b23d0ba 183 #endif
marcozecchini 0:9fca2b23d0ba 184 )
marcozecchini 0:9fca2b23d0ba 185 {
marcozecchini 0:9fca2b23d0ba 186 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
marcozecchini 0:9fca2b23d0ba 187 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
marcozecchini 0:9fca2b23d0ba 188 }
marcozecchini 0:9fca2b23d0ba 189
marcozecchini 0:9fca2b23d0ba 190 if( ( ret = mbedtls_asn1_get_tag( p, end, &params->len, params->tag ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 191 {
marcozecchini 0:9fca2b23d0ba 192 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
marcozecchini 0:9fca2b23d0ba 193 }
marcozecchini 0:9fca2b23d0ba 194
marcozecchini 0:9fca2b23d0ba 195 params->p = *p;
marcozecchini 0:9fca2b23d0ba 196 *p += params->len;
marcozecchini 0:9fca2b23d0ba 197
marcozecchini 0:9fca2b23d0ba 198 if( *p != end )
marcozecchini 0:9fca2b23d0ba 199 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
marcozecchini 0:9fca2b23d0ba 200 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
marcozecchini 0:9fca2b23d0ba 201
marcozecchini 0:9fca2b23d0ba 202 return( 0 );
marcozecchini 0:9fca2b23d0ba 203 }
marcozecchini 0:9fca2b23d0ba 204
marcozecchini 0:9fca2b23d0ba 205 #if defined(MBEDTLS_PK_PARSE_EC_EXTENDED)
marcozecchini 0:9fca2b23d0ba 206 /*
marcozecchini 0:9fca2b23d0ba 207 * Parse a SpecifiedECDomain (SEC 1 C.2) and (mostly) fill the group with it.
marcozecchini 0:9fca2b23d0ba 208 * WARNING: the resulting group should only be used with
marcozecchini 0:9fca2b23d0ba 209 * pk_group_id_from_specified(), since its base point may not be set correctly
marcozecchini 0:9fca2b23d0ba 210 * if it was encoded compressed.
marcozecchini 0:9fca2b23d0ba 211 *
marcozecchini 0:9fca2b23d0ba 212 * SpecifiedECDomain ::= SEQUENCE {
marcozecchini 0:9fca2b23d0ba 213 * version SpecifiedECDomainVersion(ecdpVer1 | ecdpVer2 | ecdpVer3, ...),
marcozecchini 0:9fca2b23d0ba 214 * fieldID FieldID {{FieldTypes}},
marcozecchini 0:9fca2b23d0ba 215 * curve Curve,
marcozecchini 0:9fca2b23d0ba 216 * base ECPoint,
marcozecchini 0:9fca2b23d0ba 217 * order INTEGER,
marcozecchini 0:9fca2b23d0ba 218 * cofactor INTEGER OPTIONAL,
marcozecchini 0:9fca2b23d0ba 219 * hash HashAlgorithm OPTIONAL,
marcozecchini 0:9fca2b23d0ba 220 * ...
marcozecchini 0:9fca2b23d0ba 221 * }
marcozecchini 0:9fca2b23d0ba 222 *
marcozecchini 0:9fca2b23d0ba 223 * We only support prime-field as field type, and ignore hash and cofactor.
marcozecchini 0:9fca2b23d0ba 224 */
marcozecchini 0:9fca2b23d0ba 225 static int pk_group_from_specified( const mbedtls_asn1_buf *params, mbedtls_ecp_group *grp )
marcozecchini 0:9fca2b23d0ba 226 {
marcozecchini 0:9fca2b23d0ba 227 int ret;
marcozecchini 0:9fca2b23d0ba 228 unsigned char *p = params->p;
marcozecchini 0:9fca2b23d0ba 229 const unsigned char * const end = params->p + params->len;
marcozecchini 0:9fca2b23d0ba 230 const unsigned char *end_field, *end_curve;
marcozecchini 0:9fca2b23d0ba 231 size_t len;
marcozecchini 0:9fca2b23d0ba 232 int ver;
marcozecchini 0:9fca2b23d0ba 233
marcozecchini 0:9fca2b23d0ba 234 /* SpecifiedECDomainVersion ::= INTEGER { 1, 2, 3 } */
marcozecchini 0:9fca2b23d0ba 235 if( ( ret = mbedtls_asn1_get_int( &p, end, &ver ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 236 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
marcozecchini 0:9fca2b23d0ba 237
marcozecchini 0:9fca2b23d0ba 238 if( ver < 1 || ver > 3 )
marcozecchini 0:9fca2b23d0ba 239 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
marcozecchini 0:9fca2b23d0ba 240
marcozecchini 0:9fca2b23d0ba 241 /*
marcozecchini 0:9fca2b23d0ba 242 * FieldID { FIELD-ID:IOSet } ::= SEQUENCE { -- Finite field
marcozecchini 0:9fca2b23d0ba 243 * fieldType FIELD-ID.&id({IOSet}),
marcozecchini 0:9fca2b23d0ba 244 * parameters FIELD-ID.&Type({IOSet}{@fieldType})
marcozecchini 0:9fca2b23d0ba 245 * }
marcozecchini 0:9fca2b23d0ba 246 */
marcozecchini 0:9fca2b23d0ba 247 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
marcozecchini 0:9fca2b23d0ba 248 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 249 return( ret );
marcozecchini 0:9fca2b23d0ba 250
marcozecchini 0:9fca2b23d0ba 251 end_field = p + len;
marcozecchini 0:9fca2b23d0ba 252
marcozecchini 0:9fca2b23d0ba 253 /*
marcozecchini 0:9fca2b23d0ba 254 * FIELD-ID ::= TYPE-IDENTIFIER
marcozecchini 0:9fca2b23d0ba 255 * FieldTypes FIELD-ID ::= {
marcozecchini 0:9fca2b23d0ba 256 * { Prime-p IDENTIFIED BY prime-field } |
marcozecchini 0:9fca2b23d0ba 257 * { Characteristic-two IDENTIFIED BY characteristic-two-field }
marcozecchini 0:9fca2b23d0ba 258 * }
marcozecchini 0:9fca2b23d0ba 259 * prime-field OBJECT IDENTIFIER ::= { id-fieldType 1 }
marcozecchini 0:9fca2b23d0ba 260 */
marcozecchini 0:9fca2b23d0ba 261 if( ( ret = mbedtls_asn1_get_tag( &p, end_field, &len, MBEDTLS_ASN1_OID ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 262 return( ret );
marcozecchini 0:9fca2b23d0ba 263
marcozecchini 0:9fca2b23d0ba 264 if( len != MBEDTLS_OID_SIZE( MBEDTLS_OID_ANSI_X9_62_PRIME_FIELD ) ||
marcozecchini 0:9fca2b23d0ba 265 memcmp( p, MBEDTLS_OID_ANSI_X9_62_PRIME_FIELD, len ) != 0 )
marcozecchini 0:9fca2b23d0ba 266 {
marcozecchini 0:9fca2b23d0ba 267 return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
marcozecchini 0:9fca2b23d0ba 268 }
marcozecchini 0:9fca2b23d0ba 269
marcozecchini 0:9fca2b23d0ba 270 p += len;
marcozecchini 0:9fca2b23d0ba 271
marcozecchini 0:9fca2b23d0ba 272 /* Prime-p ::= INTEGER -- Field of size p. */
marcozecchini 0:9fca2b23d0ba 273 if( ( ret = mbedtls_asn1_get_mpi( &p, end_field, &grp->P ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 274 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
marcozecchini 0:9fca2b23d0ba 275
marcozecchini 0:9fca2b23d0ba 276 grp->pbits = mbedtls_mpi_bitlen( &grp->P );
marcozecchini 0:9fca2b23d0ba 277
marcozecchini 0:9fca2b23d0ba 278 if( p != end_field )
marcozecchini 0:9fca2b23d0ba 279 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
marcozecchini 0:9fca2b23d0ba 280 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
marcozecchini 0:9fca2b23d0ba 281
marcozecchini 0:9fca2b23d0ba 282 /*
marcozecchini 0:9fca2b23d0ba 283 * Curve ::= SEQUENCE {
marcozecchini 0:9fca2b23d0ba 284 * a FieldElement,
marcozecchini 0:9fca2b23d0ba 285 * b FieldElement,
marcozecchini 0:9fca2b23d0ba 286 * seed BIT STRING OPTIONAL
marcozecchini 0:9fca2b23d0ba 287 * -- Shall be present if used in SpecifiedECDomain
marcozecchini 0:9fca2b23d0ba 288 * -- with version equal to ecdpVer2 or ecdpVer3
marcozecchini 0:9fca2b23d0ba 289 * }
marcozecchini 0:9fca2b23d0ba 290 */
marcozecchini 0:9fca2b23d0ba 291 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
marcozecchini 0:9fca2b23d0ba 292 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 293 return( ret );
marcozecchini 0:9fca2b23d0ba 294
marcozecchini 0:9fca2b23d0ba 295 end_curve = p + len;
marcozecchini 0:9fca2b23d0ba 296
marcozecchini 0:9fca2b23d0ba 297 /*
marcozecchini 0:9fca2b23d0ba 298 * FieldElement ::= OCTET STRING
marcozecchini 0:9fca2b23d0ba 299 * containing an integer in the case of a prime field
marcozecchini 0:9fca2b23d0ba 300 */
marcozecchini 0:9fca2b23d0ba 301 if( ( ret = mbedtls_asn1_get_tag( &p, end_curve, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 ||
marcozecchini 0:9fca2b23d0ba 302 ( ret = mbedtls_mpi_read_binary( &grp->A, p, len ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 303 {
marcozecchini 0:9fca2b23d0ba 304 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
marcozecchini 0:9fca2b23d0ba 305 }
marcozecchini 0:9fca2b23d0ba 306
marcozecchini 0:9fca2b23d0ba 307 p += len;
marcozecchini 0:9fca2b23d0ba 308
marcozecchini 0:9fca2b23d0ba 309 if( ( ret = mbedtls_asn1_get_tag( &p, end_curve, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 ||
marcozecchini 0:9fca2b23d0ba 310 ( ret = mbedtls_mpi_read_binary( &grp->B, p, len ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 311 {
marcozecchini 0:9fca2b23d0ba 312 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
marcozecchini 0:9fca2b23d0ba 313 }
marcozecchini 0:9fca2b23d0ba 314
marcozecchini 0:9fca2b23d0ba 315 p += len;
marcozecchini 0:9fca2b23d0ba 316
marcozecchini 0:9fca2b23d0ba 317 /* Ignore seed BIT STRING OPTIONAL */
marcozecchini 0:9fca2b23d0ba 318 if( ( ret = mbedtls_asn1_get_tag( &p, end_curve, &len, MBEDTLS_ASN1_BIT_STRING ) ) == 0 )
marcozecchini 0:9fca2b23d0ba 319 p += len;
marcozecchini 0:9fca2b23d0ba 320
marcozecchini 0:9fca2b23d0ba 321 if( p != end_curve )
marcozecchini 0:9fca2b23d0ba 322 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
marcozecchini 0:9fca2b23d0ba 323 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
marcozecchini 0:9fca2b23d0ba 324
marcozecchini 0:9fca2b23d0ba 325 /*
marcozecchini 0:9fca2b23d0ba 326 * ECPoint ::= OCTET STRING
marcozecchini 0:9fca2b23d0ba 327 */
marcozecchini 0:9fca2b23d0ba 328 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 329 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
marcozecchini 0:9fca2b23d0ba 330
marcozecchini 0:9fca2b23d0ba 331 if( ( ret = mbedtls_ecp_point_read_binary( grp, &grp->G,
marcozecchini 0:9fca2b23d0ba 332 ( const unsigned char *) p, len ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 333 {
marcozecchini 0:9fca2b23d0ba 334 /*
marcozecchini 0:9fca2b23d0ba 335 * If we can't read the point because it's compressed, cheat by
marcozecchini 0:9fca2b23d0ba 336 * reading only the X coordinate and the parity bit of Y.
marcozecchini 0:9fca2b23d0ba 337 */
marcozecchini 0:9fca2b23d0ba 338 if( ret != MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE ||
marcozecchini 0:9fca2b23d0ba 339 ( p[0] != 0x02 && p[0] != 0x03 ) ||
marcozecchini 0:9fca2b23d0ba 340 len != mbedtls_mpi_size( &grp->P ) + 1 ||
marcozecchini 0:9fca2b23d0ba 341 mbedtls_mpi_read_binary( &grp->G.X, p + 1, len - 1 ) != 0 ||
marcozecchini 0:9fca2b23d0ba 342 mbedtls_mpi_lset( &grp->G.Y, p[0] - 2 ) != 0 ||
marcozecchini 0:9fca2b23d0ba 343 mbedtls_mpi_lset( &grp->G.Z, 1 ) != 0 )
marcozecchini 0:9fca2b23d0ba 344 {
marcozecchini 0:9fca2b23d0ba 345 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
marcozecchini 0:9fca2b23d0ba 346 }
marcozecchini 0:9fca2b23d0ba 347 }
marcozecchini 0:9fca2b23d0ba 348
marcozecchini 0:9fca2b23d0ba 349 p += len;
marcozecchini 0:9fca2b23d0ba 350
marcozecchini 0:9fca2b23d0ba 351 /*
marcozecchini 0:9fca2b23d0ba 352 * order INTEGER
marcozecchini 0:9fca2b23d0ba 353 */
marcozecchini 0:9fca2b23d0ba 354 if( ( ret = mbedtls_asn1_get_mpi( &p, end, &grp->N ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 355 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
marcozecchini 0:9fca2b23d0ba 356
marcozecchini 0:9fca2b23d0ba 357 grp->nbits = mbedtls_mpi_bitlen( &grp->N );
marcozecchini 0:9fca2b23d0ba 358
marcozecchini 0:9fca2b23d0ba 359 /*
marcozecchini 0:9fca2b23d0ba 360 * Allow optional elements by purposefully not enforcing p == end here.
marcozecchini 0:9fca2b23d0ba 361 */
marcozecchini 0:9fca2b23d0ba 362
marcozecchini 0:9fca2b23d0ba 363 return( 0 );
marcozecchini 0:9fca2b23d0ba 364 }
marcozecchini 0:9fca2b23d0ba 365
marcozecchini 0:9fca2b23d0ba 366 /*
marcozecchini 0:9fca2b23d0ba 367 * Find the group id associated with an (almost filled) group as generated by
marcozecchini 0:9fca2b23d0ba 368 * pk_group_from_specified(), or return an error if unknown.
marcozecchini 0:9fca2b23d0ba 369 */
marcozecchini 0:9fca2b23d0ba 370 static int pk_group_id_from_group( const mbedtls_ecp_group *grp, mbedtls_ecp_group_id *grp_id )
marcozecchini 0:9fca2b23d0ba 371 {
marcozecchini 0:9fca2b23d0ba 372 int ret = 0;
marcozecchini 0:9fca2b23d0ba 373 mbedtls_ecp_group ref;
marcozecchini 0:9fca2b23d0ba 374 const mbedtls_ecp_group_id *id;
marcozecchini 0:9fca2b23d0ba 375
marcozecchini 0:9fca2b23d0ba 376 mbedtls_ecp_group_init( &ref );
marcozecchini 0:9fca2b23d0ba 377
marcozecchini 0:9fca2b23d0ba 378 for( id = mbedtls_ecp_grp_id_list(); *id != MBEDTLS_ECP_DP_NONE; id++ )
marcozecchini 0:9fca2b23d0ba 379 {
marcozecchini 0:9fca2b23d0ba 380 /* Load the group associated to that id */
marcozecchini 0:9fca2b23d0ba 381 mbedtls_ecp_group_free( &ref );
marcozecchini 0:9fca2b23d0ba 382 MBEDTLS_MPI_CHK( mbedtls_ecp_group_load( &ref, *id ) );
marcozecchini 0:9fca2b23d0ba 383
marcozecchini 0:9fca2b23d0ba 384 /* Compare to the group we were given, starting with easy tests */
marcozecchini 0:9fca2b23d0ba 385 if( grp->pbits == ref.pbits && grp->nbits == ref.nbits &&
marcozecchini 0:9fca2b23d0ba 386 mbedtls_mpi_cmp_mpi( &grp->P, &ref.P ) == 0 &&
marcozecchini 0:9fca2b23d0ba 387 mbedtls_mpi_cmp_mpi( &grp->A, &ref.A ) == 0 &&
marcozecchini 0:9fca2b23d0ba 388 mbedtls_mpi_cmp_mpi( &grp->B, &ref.B ) == 0 &&
marcozecchini 0:9fca2b23d0ba 389 mbedtls_mpi_cmp_mpi( &grp->N, &ref.N ) == 0 &&
marcozecchini 0:9fca2b23d0ba 390 mbedtls_mpi_cmp_mpi( &grp->G.X, &ref.G.X ) == 0 &&
marcozecchini 0:9fca2b23d0ba 391 mbedtls_mpi_cmp_mpi( &grp->G.Z, &ref.G.Z ) == 0 &&
marcozecchini 0:9fca2b23d0ba 392 /* For Y we may only know the parity bit, so compare only that */
marcozecchini 0:9fca2b23d0ba 393 mbedtls_mpi_get_bit( &grp->G.Y, 0 ) == mbedtls_mpi_get_bit( &ref.G.Y, 0 ) )
marcozecchini 0:9fca2b23d0ba 394 {
marcozecchini 0:9fca2b23d0ba 395 break;
marcozecchini 0:9fca2b23d0ba 396 }
marcozecchini 0:9fca2b23d0ba 397
marcozecchini 0:9fca2b23d0ba 398 }
marcozecchini 0:9fca2b23d0ba 399
marcozecchini 0:9fca2b23d0ba 400 cleanup:
marcozecchini 0:9fca2b23d0ba 401 mbedtls_ecp_group_free( &ref );
marcozecchini 0:9fca2b23d0ba 402
marcozecchini 0:9fca2b23d0ba 403 *grp_id = *id;
marcozecchini 0:9fca2b23d0ba 404
marcozecchini 0:9fca2b23d0ba 405 if( ret == 0 && *id == MBEDTLS_ECP_DP_NONE )
marcozecchini 0:9fca2b23d0ba 406 ret = MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE;
marcozecchini 0:9fca2b23d0ba 407
marcozecchini 0:9fca2b23d0ba 408 return( ret );
marcozecchini 0:9fca2b23d0ba 409 }
marcozecchini 0:9fca2b23d0ba 410
marcozecchini 0:9fca2b23d0ba 411 /*
marcozecchini 0:9fca2b23d0ba 412 * Parse a SpecifiedECDomain (SEC 1 C.2) and find the associated group ID
marcozecchini 0:9fca2b23d0ba 413 */
marcozecchini 0:9fca2b23d0ba 414 static int pk_group_id_from_specified( const mbedtls_asn1_buf *params,
marcozecchini 0:9fca2b23d0ba 415 mbedtls_ecp_group_id *grp_id )
marcozecchini 0:9fca2b23d0ba 416 {
marcozecchini 0:9fca2b23d0ba 417 int ret;
marcozecchini 0:9fca2b23d0ba 418 mbedtls_ecp_group grp;
marcozecchini 0:9fca2b23d0ba 419
marcozecchini 0:9fca2b23d0ba 420 mbedtls_ecp_group_init( &grp );
marcozecchini 0:9fca2b23d0ba 421
marcozecchini 0:9fca2b23d0ba 422 if( ( ret = pk_group_from_specified( params, &grp ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 423 goto cleanup;
marcozecchini 0:9fca2b23d0ba 424
marcozecchini 0:9fca2b23d0ba 425 ret = pk_group_id_from_group( &grp, grp_id );
marcozecchini 0:9fca2b23d0ba 426
marcozecchini 0:9fca2b23d0ba 427 cleanup:
marcozecchini 0:9fca2b23d0ba 428 mbedtls_ecp_group_free( &grp );
marcozecchini 0:9fca2b23d0ba 429
marcozecchini 0:9fca2b23d0ba 430 return( ret );
marcozecchini 0:9fca2b23d0ba 431 }
marcozecchini 0:9fca2b23d0ba 432 #endif /* MBEDTLS_PK_PARSE_EC_EXTENDED */
marcozecchini 0:9fca2b23d0ba 433
marcozecchini 0:9fca2b23d0ba 434 /*
marcozecchini 0:9fca2b23d0ba 435 * Use EC parameters to initialise an EC group
marcozecchini 0:9fca2b23d0ba 436 *
marcozecchini 0:9fca2b23d0ba 437 * ECParameters ::= CHOICE {
marcozecchini 0:9fca2b23d0ba 438 * namedCurve OBJECT IDENTIFIER
marcozecchini 0:9fca2b23d0ba 439 * specifiedCurve SpecifiedECDomain -- = SEQUENCE { ... }
marcozecchini 0:9fca2b23d0ba 440 * -- implicitCurve NULL
marcozecchini 0:9fca2b23d0ba 441 */
marcozecchini 0:9fca2b23d0ba 442 static int pk_use_ecparams( const mbedtls_asn1_buf *params, mbedtls_ecp_group *grp )
marcozecchini 0:9fca2b23d0ba 443 {
marcozecchini 0:9fca2b23d0ba 444 int ret;
marcozecchini 0:9fca2b23d0ba 445 mbedtls_ecp_group_id grp_id;
marcozecchini 0:9fca2b23d0ba 446
marcozecchini 0:9fca2b23d0ba 447 if( params->tag == MBEDTLS_ASN1_OID )
marcozecchini 0:9fca2b23d0ba 448 {
marcozecchini 0:9fca2b23d0ba 449 if( mbedtls_oid_get_ec_grp( params, &grp_id ) != 0 )
marcozecchini 0:9fca2b23d0ba 450 return( MBEDTLS_ERR_PK_UNKNOWN_NAMED_CURVE );
marcozecchini 0:9fca2b23d0ba 451 }
marcozecchini 0:9fca2b23d0ba 452 else
marcozecchini 0:9fca2b23d0ba 453 {
marcozecchini 0:9fca2b23d0ba 454 #if defined(MBEDTLS_PK_PARSE_EC_EXTENDED)
marcozecchini 0:9fca2b23d0ba 455 if( ( ret = pk_group_id_from_specified( params, &grp_id ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 456 return( ret );
marcozecchini 0:9fca2b23d0ba 457 #else
marcozecchini 0:9fca2b23d0ba 458 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
marcozecchini 0:9fca2b23d0ba 459 #endif
marcozecchini 0:9fca2b23d0ba 460 }
marcozecchini 0:9fca2b23d0ba 461
marcozecchini 0:9fca2b23d0ba 462 /*
marcozecchini 0:9fca2b23d0ba 463 * grp may already be initilialized; if so, make sure IDs match
marcozecchini 0:9fca2b23d0ba 464 */
marcozecchini 0:9fca2b23d0ba 465 if( grp->id != MBEDTLS_ECP_DP_NONE && grp->id != grp_id )
marcozecchini 0:9fca2b23d0ba 466 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
marcozecchini 0:9fca2b23d0ba 467
marcozecchini 0:9fca2b23d0ba 468 if( ( ret = mbedtls_ecp_group_load( grp, grp_id ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 469 return( ret );
marcozecchini 0:9fca2b23d0ba 470
marcozecchini 0:9fca2b23d0ba 471 return( 0 );
marcozecchini 0:9fca2b23d0ba 472 }
marcozecchini 0:9fca2b23d0ba 473
marcozecchini 0:9fca2b23d0ba 474 /*
marcozecchini 0:9fca2b23d0ba 475 * EC public key is an EC point
marcozecchini 0:9fca2b23d0ba 476 *
marcozecchini 0:9fca2b23d0ba 477 * The caller is responsible for clearing the structure upon failure if
marcozecchini 0:9fca2b23d0ba 478 * desired. Take care to pass along the possible ECP_FEATURE_UNAVAILABLE
marcozecchini 0:9fca2b23d0ba 479 * return code of mbedtls_ecp_point_read_binary() and leave p in a usable state.
marcozecchini 0:9fca2b23d0ba 480 */
marcozecchini 0:9fca2b23d0ba 481 static int pk_get_ecpubkey( unsigned char **p, const unsigned char *end,
marcozecchini 0:9fca2b23d0ba 482 mbedtls_ecp_keypair *key )
marcozecchini 0:9fca2b23d0ba 483 {
marcozecchini 0:9fca2b23d0ba 484 int ret;
marcozecchini 0:9fca2b23d0ba 485
marcozecchini 0:9fca2b23d0ba 486 if( ( ret = mbedtls_ecp_point_read_binary( &key->grp, &key->Q,
marcozecchini 0:9fca2b23d0ba 487 (const unsigned char *) *p, end - *p ) ) == 0 )
marcozecchini 0:9fca2b23d0ba 488 {
marcozecchini 0:9fca2b23d0ba 489 ret = mbedtls_ecp_check_pubkey( &key->grp, &key->Q );
marcozecchini 0:9fca2b23d0ba 490 }
marcozecchini 0:9fca2b23d0ba 491
marcozecchini 0:9fca2b23d0ba 492 /*
marcozecchini 0:9fca2b23d0ba 493 * We know mbedtls_ecp_point_read_binary consumed all bytes or failed
marcozecchini 0:9fca2b23d0ba 494 */
marcozecchini 0:9fca2b23d0ba 495 *p = (unsigned char *) end;
marcozecchini 0:9fca2b23d0ba 496
marcozecchini 0:9fca2b23d0ba 497 return( ret );
marcozecchini 0:9fca2b23d0ba 498 }
marcozecchini 0:9fca2b23d0ba 499 #endif /* MBEDTLS_ECP_C */
marcozecchini 0:9fca2b23d0ba 500
marcozecchini 0:9fca2b23d0ba 501 #if defined(MBEDTLS_RSA_C)
marcozecchini 0:9fca2b23d0ba 502 /*
marcozecchini 0:9fca2b23d0ba 503 * RSAPublicKey ::= SEQUENCE {
marcozecchini 0:9fca2b23d0ba 504 * modulus INTEGER, -- n
marcozecchini 0:9fca2b23d0ba 505 * publicExponent INTEGER -- e
marcozecchini 0:9fca2b23d0ba 506 * }
marcozecchini 0:9fca2b23d0ba 507 */
marcozecchini 0:9fca2b23d0ba 508 static int pk_get_rsapubkey( unsigned char **p,
marcozecchini 0:9fca2b23d0ba 509 const unsigned char *end,
marcozecchini 0:9fca2b23d0ba 510 mbedtls_rsa_context *rsa )
marcozecchini 0:9fca2b23d0ba 511 {
marcozecchini 0:9fca2b23d0ba 512 int ret;
marcozecchini 0:9fca2b23d0ba 513 size_t len;
marcozecchini 0:9fca2b23d0ba 514
marcozecchini 0:9fca2b23d0ba 515 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
marcozecchini 0:9fca2b23d0ba 516 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 517 return( MBEDTLS_ERR_PK_INVALID_PUBKEY + ret );
marcozecchini 0:9fca2b23d0ba 518
marcozecchini 0:9fca2b23d0ba 519 if( *p + len != end )
marcozecchini 0:9fca2b23d0ba 520 return( MBEDTLS_ERR_PK_INVALID_PUBKEY +
marcozecchini 0:9fca2b23d0ba 521 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
marcozecchini 0:9fca2b23d0ba 522
marcozecchini 0:9fca2b23d0ba 523 if( ( ret = mbedtls_asn1_get_mpi( p, end, &rsa->N ) ) != 0 ||
marcozecchini 0:9fca2b23d0ba 524 ( ret = mbedtls_asn1_get_mpi( p, end, &rsa->E ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 525 return( MBEDTLS_ERR_PK_INVALID_PUBKEY + ret );
marcozecchini 0:9fca2b23d0ba 526
marcozecchini 0:9fca2b23d0ba 527 if( *p != end )
marcozecchini 0:9fca2b23d0ba 528 return( MBEDTLS_ERR_PK_INVALID_PUBKEY +
marcozecchini 0:9fca2b23d0ba 529 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
marcozecchini 0:9fca2b23d0ba 530
marcozecchini 0:9fca2b23d0ba 531 if( ( ret = mbedtls_rsa_check_pubkey( rsa ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 532 return( MBEDTLS_ERR_PK_INVALID_PUBKEY );
marcozecchini 0:9fca2b23d0ba 533
marcozecchini 0:9fca2b23d0ba 534 rsa->len = mbedtls_mpi_size( &rsa->N );
marcozecchini 0:9fca2b23d0ba 535
marcozecchini 0:9fca2b23d0ba 536 return( 0 );
marcozecchini 0:9fca2b23d0ba 537 }
marcozecchini 0:9fca2b23d0ba 538 #endif /* MBEDTLS_RSA_C */
marcozecchini 0:9fca2b23d0ba 539
marcozecchini 0:9fca2b23d0ba 540 /* Get a PK algorithm identifier
marcozecchini 0:9fca2b23d0ba 541 *
marcozecchini 0:9fca2b23d0ba 542 * AlgorithmIdentifier ::= SEQUENCE {
marcozecchini 0:9fca2b23d0ba 543 * algorithm OBJECT IDENTIFIER,
marcozecchini 0:9fca2b23d0ba 544 * parameters ANY DEFINED BY algorithm OPTIONAL }
marcozecchini 0:9fca2b23d0ba 545 */
marcozecchini 0:9fca2b23d0ba 546 static int pk_get_pk_alg( unsigned char **p,
marcozecchini 0:9fca2b23d0ba 547 const unsigned char *end,
marcozecchini 0:9fca2b23d0ba 548 mbedtls_pk_type_t *pk_alg, mbedtls_asn1_buf *params )
marcozecchini 0:9fca2b23d0ba 549 {
marcozecchini 0:9fca2b23d0ba 550 int ret;
marcozecchini 0:9fca2b23d0ba 551 mbedtls_asn1_buf alg_oid;
marcozecchini 0:9fca2b23d0ba 552
marcozecchini 0:9fca2b23d0ba 553 memset( params, 0, sizeof(mbedtls_asn1_buf) );
marcozecchini 0:9fca2b23d0ba 554
marcozecchini 0:9fca2b23d0ba 555 if( ( ret = mbedtls_asn1_get_alg( p, end, &alg_oid, params ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 556 return( MBEDTLS_ERR_PK_INVALID_ALG + ret );
marcozecchini 0:9fca2b23d0ba 557
marcozecchini 0:9fca2b23d0ba 558 if( mbedtls_oid_get_pk_alg( &alg_oid, pk_alg ) != 0 )
marcozecchini 0:9fca2b23d0ba 559 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
marcozecchini 0:9fca2b23d0ba 560
marcozecchini 0:9fca2b23d0ba 561 /*
marcozecchini 0:9fca2b23d0ba 562 * No parameters with RSA (only for EC)
marcozecchini 0:9fca2b23d0ba 563 */
marcozecchini 0:9fca2b23d0ba 564 if( *pk_alg == MBEDTLS_PK_RSA &&
marcozecchini 0:9fca2b23d0ba 565 ( ( params->tag != MBEDTLS_ASN1_NULL && params->tag != 0 ) ||
marcozecchini 0:9fca2b23d0ba 566 params->len != 0 ) )
marcozecchini 0:9fca2b23d0ba 567 {
marcozecchini 0:9fca2b23d0ba 568 return( MBEDTLS_ERR_PK_INVALID_ALG );
marcozecchini 0:9fca2b23d0ba 569 }
marcozecchini 0:9fca2b23d0ba 570
marcozecchini 0:9fca2b23d0ba 571 return( 0 );
marcozecchini 0:9fca2b23d0ba 572 }
marcozecchini 0:9fca2b23d0ba 573
marcozecchini 0:9fca2b23d0ba 574 /*
marcozecchini 0:9fca2b23d0ba 575 * SubjectPublicKeyInfo ::= SEQUENCE {
marcozecchini 0:9fca2b23d0ba 576 * algorithm AlgorithmIdentifier,
marcozecchini 0:9fca2b23d0ba 577 * subjectPublicKey BIT STRING }
marcozecchini 0:9fca2b23d0ba 578 */
marcozecchini 0:9fca2b23d0ba 579 int mbedtls_pk_parse_subpubkey( unsigned char **p, const unsigned char *end,
marcozecchini 0:9fca2b23d0ba 580 mbedtls_pk_context *pk )
marcozecchini 0:9fca2b23d0ba 581 {
marcozecchini 0:9fca2b23d0ba 582 int ret;
marcozecchini 0:9fca2b23d0ba 583 size_t len;
marcozecchini 0:9fca2b23d0ba 584 mbedtls_asn1_buf alg_params;
marcozecchini 0:9fca2b23d0ba 585 mbedtls_pk_type_t pk_alg = MBEDTLS_PK_NONE;
marcozecchini 0:9fca2b23d0ba 586 const mbedtls_pk_info_t *pk_info;
marcozecchini 0:9fca2b23d0ba 587
marcozecchini 0:9fca2b23d0ba 588 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
marcozecchini 0:9fca2b23d0ba 589 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 590 {
marcozecchini 0:9fca2b23d0ba 591 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
marcozecchini 0:9fca2b23d0ba 592 }
marcozecchini 0:9fca2b23d0ba 593
marcozecchini 0:9fca2b23d0ba 594 end = *p + len;
marcozecchini 0:9fca2b23d0ba 595
marcozecchini 0:9fca2b23d0ba 596 if( ( ret = pk_get_pk_alg( p, end, &pk_alg, &alg_params ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 597 return( ret );
marcozecchini 0:9fca2b23d0ba 598
marcozecchini 0:9fca2b23d0ba 599 if( ( ret = mbedtls_asn1_get_bitstring_null( p, end, &len ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 600 return( MBEDTLS_ERR_PK_INVALID_PUBKEY + ret );
marcozecchini 0:9fca2b23d0ba 601
marcozecchini 0:9fca2b23d0ba 602 if( *p + len != end )
marcozecchini 0:9fca2b23d0ba 603 return( MBEDTLS_ERR_PK_INVALID_PUBKEY +
marcozecchini 0:9fca2b23d0ba 604 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
marcozecchini 0:9fca2b23d0ba 605
marcozecchini 0:9fca2b23d0ba 606 if( ( pk_info = mbedtls_pk_info_from_type( pk_alg ) ) == NULL )
marcozecchini 0:9fca2b23d0ba 607 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
marcozecchini 0:9fca2b23d0ba 608
marcozecchini 0:9fca2b23d0ba 609 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 610 return( ret );
marcozecchini 0:9fca2b23d0ba 611
marcozecchini 0:9fca2b23d0ba 612 #if defined(MBEDTLS_RSA_C)
marcozecchini 0:9fca2b23d0ba 613 if( pk_alg == MBEDTLS_PK_RSA )
marcozecchini 0:9fca2b23d0ba 614 {
marcozecchini 0:9fca2b23d0ba 615 ret = pk_get_rsapubkey( p, end, mbedtls_pk_rsa( *pk ) );
marcozecchini 0:9fca2b23d0ba 616 } else
marcozecchini 0:9fca2b23d0ba 617 #endif /* MBEDTLS_RSA_C */
marcozecchini 0:9fca2b23d0ba 618 #if defined(MBEDTLS_ECP_C)
marcozecchini 0:9fca2b23d0ba 619 if( pk_alg == MBEDTLS_PK_ECKEY_DH || pk_alg == MBEDTLS_PK_ECKEY )
marcozecchini 0:9fca2b23d0ba 620 {
marcozecchini 0:9fca2b23d0ba 621 ret = pk_use_ecparams( &alg_params, &mbedtls_pk_ec( *pk )->grp );
marcozecchini 0:9fca2b23d0ba 622 if( ret == 0 )
marcozecchini 0:9fca2b23d0ba 623 ret = pk_get_ecpubkey( p, end, mbedtls_pk_ec( *pk ) );
marcozecchini 0:9fca2b23d0ba 624 } else
marcozecchini 0:9fca2b23d0ba 625 #endif /* MBEDTLS_ECP_C */
marcozecchini 0:9fca2b23d0ba 626 ret = MBEDTLS_ERR_PK_UNKNOWN_PK_ALG;
marcozecchini 0:9fca2b23d0ba 627
marcozecchini 0:9fca2b23d0ba 628 if( ret == 0 && *p != end )
marcozecchini 0:9fca2b23d0ba 629 ret = MBEDTLS_ERR_PK_INVALID_PUBKEY
marcozecchini 0:9fca2b23d0ba 630 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH;
marcozecchini 0:9fca2b23d0ba 631
marcozecchini 0:9fca2b23d0ba 632 if( ret != 0 )
marcozecchini 0:9fca2b23d0ba 633 mbedtls_pk_free( pk );
marcozecchini 0:9fca2b23d0ba 634
marcozecchini 0:9fca2b23d0ba 635 return( ret );
marcozecchini 0:9fca2b23d0ba 636 }
marcozecchini 0:9fca2b23d0ba 637
marcozecchini 0:9fca2b23d0ba 638 #if defined(MBEDTLS_RSA_C)
marcozecchini 0:9fca2b23d0ba 639 /*
marcozecchini 0:9fca2b23d0ba 640 * Parse a PKCS#1 encoded private RSA key
marcozecchini 0:9fca2b23d0ba 641 */
marcozecchini 0:9fca2b23d0ba 642 static int pk_parse_key_pkcs1_der( mbedtls_rsa_context *rsa,
marcozecchini 0:9fca2b23d0ba 643 const unsigned char *key,
marcozecchini 0:9fca2b23d0ba 644 size_t keylen )
marcozecchini 0:9fca2b23d0ba 645 {
marcozecchini 0:9fca2b23d0ba 646 int ret;
marcozecchini 0:9fca2b23d0ba 647 size_t len;
marcozecchini 0:9fca2b23d0ba 648 unsigned char *p, *end;
marcozecchini 0:9fca2b23d0ba 649
marcozecchini 0:9fca2b23d0ba 650 p = (unsigned char *) key;
marcozecchini 0:9fca2b23d0ba 651 end = p + keylen;
marcozecchini 0:9fca2b23d0ba 652
marcozecchini 0:9fca2b23d0ba 653 /*
marcozecchini 0:9fca2b23d0ba 654 * This function parses the RSAPrivateKey (PKCS#1)
marcozecchini 0:9fca2b23d0ba 655 *
marcozecchini 0:9fca2b23d0ba 656 * RSAPrivateKey ::= SEQUENCE {
marcozecchini 0:9fca2b23d0ba 657 * version Version,
marcozecchini 0:9fca2b23d0ba 658 * modulus INTEGER, -- n
marcozecchini 0:9fca2b23d0ba 659 * publicExponent INTEGER, -- e
marcozecchini 0:9fca2b23d0ba 660 * privateExponent INTEGER, -- d
marcozecchini 0:9fca2b23d0ba 661 * prime1 INTEGER, -- p
marcozecchini 0:9fca2b23d0ba 662 * prime2 INTEGER, -- q
marcozecchini 0:9fca2b23d0ba 663 * exponent1 INTEGER, -- d mod (p-1)
marcozecchini 0:9fca2b23d0ba 664 * exponent2 INTEGER, -- d mod (q-1)
marcozecchini 0:9fca2b23d0ba 665 * coefficient INTEGER, -- (inverse of q) mod p
marcozecchini 0:9fca2b23d0ba 666 * otherPrimeInfos OtherPrimeInfos OPTIONAL
marcozecchini 0:9fca2b23d0ba 667 * }
marcozecchini 0:9fca2b23d0ba 668 */
marcozecchini 0:9fca2b23d0ba 669 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
marcozecchini 0:9fca2b23d0ba 670 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 671 {
marcozecchini 0:9fca2b23d0ba 672 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
marcozecchini 0:9fca2b23d0ba 673 }
marcozecchini 0:9fca2b23d0ba 674
marcozecchini 0:9fca2b23d0ba 675 end = p + len;
marcozecchini 0:9fca2b23d0ba 676
marcozecchini 0:9fca2b23d0ba 677 if( ( ret = mbedtls_asn1_get_int( &p, end, &rsa->ver ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 678 {
marcozecchini 0:9fca2b23d0ba 679 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
marcozecchini 0:9fca2b23d0ba 680 }
marcozecchini 0:9fca2b23d0ba 681
marcozecchini 0:9fca2b23d0ba 682 if( rsa->ver != 0 )
marcozecchini 0:9fca2b23d0ba 683 {
marcozecchini 0:9fca2b23d0ba 684 return( MBEDTLS_ERR_PK_KEY_INVALID_VERSION );
marcozecchini 0:9fca2b23d0ba 685 }
marcozecchini 0:9fca2b23d0ba 686
marcozecchini 0:9fca2b23d0ba 687 if( ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->N ) ) != 0 ||
marcozecchini 0:9fca2b23d0ba 688 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->E ) ) != 0 ||
marcozecchini 0:9fca2b23d0ba 689 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->D ) ) != 0 ||
marcozecchini 0:9fca2b23d0ba 690 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->P ) ) != 0 ||
marcozecchini 0:9fca2b23d0ba 691 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->Q ) ) != 0 ||
marcozecchini 0:9fca2b23d0ba 692 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->DP ) ) != 0 ||
marcozecchini 0:9fca2b23d0ba 693 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->DQ ) ) != 0 ||
marcozecchini 0:9fca2b23d0ba 694 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->QP ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 695 {
marcozecchini 0:9fca2b23d0ba 696 mbedtls_rsa_free( rsa );
marcozecchini 0:9fca2b23d0ba 697 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
marcozecchini 0:9fca2b23d0ba 698 }
marcozecchini 0:9fca2b23d0ba 699
marcozecchini 0:9fca2b23d0ba 700 rsa->len = mbedtls_mpi_size( &rsa->N );
marcozecchini 0:9fca2b23d0ba 701
marcozecchini 0:9fca2b23d0ba 702 if( p != end )
marcozecchini 0:9fca2b23d0ba 703 {
marcozecchini 0:9fca2b23d0ba 704 mbedtls_rsa_free( rsa );
marcozecchini 0:9fca2b23d0ba 705 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
marcozecchini 0:9fca2b23d0ba 706 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
marcozecchini 0:9fca2b23d0ba 707 }
marcozecchini 0:9fca2b23d0ba 708
marcozecchini 0:9fca2b23d0ba 709 if( ( ret = mbedtls_rsa_check_privkey( rsa ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 710 {
marcozecchini 0:9fca2b23d0ba 711 mbedtls_rsa_free( rsa );
marcozecchini 0:9fca2b23d0ba 712 return( ret );
marcozecchini 0:9fca2b23d0ba 713 }
marcozecchini 0:9fca2b23d0ba 714
marcozecchini 0:9fca2b23d0ba 715 return( 0 );
marcozecchini 0:9fca2b23d0ba 716 }
marcozecchini 0:9fca2b23d0ba 717 #endif /* MBEDTLS_RSA_C */
marcozecchini 0:9fca2b23d0ba 718
marcozecchini 0:9fca2b23d0ba 719 #if defined(MBEDTLS_ECP_C)
marcozecchini 0:9fca2b23d0ba 720 /*
marcozecchini 0:9fca2b23d0ba 721 * Parse a SEC1 encoded private EC key
marcozecchini 0:9fca2b23d0ba 722 */
marcozecchini 0:9fca2b23d0ba 723 static int pk_parse_key_sec1_der( mbedtls_ecp_keypair *eck,
marcozecchini 0:9fca2b23d0ba 724 const unsigned char *key,
marcozecchini 0:9fca2b23d0ba 725 size_t keylen )
marcozecchini 0:9fca2b23d0ba 726 {
marcozecchini 0:9fca2b23d0ba 727 int ret;
marcozecchini 0:9fca2b23d0ba 728 int version, pubkey_done;
marcozecchini 0:9fca2b23d0ba 729 size_t len;
marcozecchini 0:9fca2b23d0ba 730 mbedtls_asn1_buf params;
marcozecchini 0:9fca2b23d0ba 731 unsigned char *p = (unsigned char *) key;
marcozecchini 0:9fca2b23d0ba 732 unsigned char *end = p + keylen;
marcozecchini 0:9fca2b23d0ba 733 unsigned char *end2;
marcozecchini 0:9fca2b23d0ba 734
marcozecchini 0:9fca2b23d0ba 735 /*
marcozecchini 0:9fca2b23d0ba 736 * RFC 5915, or SEC1 Appendix C.4
marcozecchini 0:9fca2b23d0ba 737 *
marcozecchini 0:9fca2b23d0ba 738 * ECPrivateKey ::= SEQUENCE {
marcozecchini 0:9fca2b23d0ba 739 * version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
marcozecchini 0:9fca2b23d0ba 740 * privateKey OCTET STRING,
marcozecchini 0:9fca2b23d0ba 741 * parameters [0] ECParameters {{ NamedCurve }} OPTIONAL,
marcozecchini 0:9fca2b23d0ba 742 * publicKey [1] BIT STRING OPTIONAL
marcozecchini 0:9fca2b23d0ba 743 * }
marcozecchini 0:9fca2b23d0ba 744 */
marcozecchini 0:9fca2b23d0ba 745 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
marcozecchini 0:9fca2b23d0ba 746 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 747 {
marcozecchini 0:9fca2b23d0ba 748 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
marcozecchini 0:9fca2b23d0ba 749 }
marcozecchini 0:9fca2b23d0ba 750
marcozecchini 0:9fca2b23d0ba 751 end = p + len;
marcozecchini 0:9fca2b23d0ba 752
marcozecchini 0:9fca2b23d0ba 753 if( ( ret = mbedtls_asn1_get_int( &p, end, &version ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 754 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
marcozecchini 0:9fca2b23d0ba 755
marcozecchini 0:9fca2b23d0ba 756 if( version != 1 )
marcozecchini 0:9fca2b23d0ba 757 return( MBEDTLS_ERR_PK_KEY_INVALID_VERSION );
marcozecchini 0:9fca2b23d0ba 758
marcozecchini 0:9fca2b23d0ba 759 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 760 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
marcozecchini 0:9fca2b23d0ba 761
marcozecchini 0:9fca2b23d0ba 762 if( ( ret = mbedtls_mpi_read_binary( &eck->d, p, len ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 763 {
marcozecchini 0:9fca2b23d0ba 764 mbedtls_ecp_keypair_free( eck );
marcozecchini 0:9fca2b23d0ba 765 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
marcozecchini 0:9fca2b23d0ba 766 }
marcozecchini 0:9fca2b23d0ba 767
marcozecchini 0:9fca2b23d0ba 768 p += len;
marcozecchini 0:9fca2b23d0ba 769
marcozecchini 0:9fca2b23d0ba 770 pubkey_done = 0;
marcozecchini 0:9fca2b23d0ba 771 if( p != end )
marcozecchini 0:9fca2b23d0ba 772 {
marcozecchini 0:9fca2b23d0ba 773 /*
marcozecchini 0:9fca2b23d0ba 774 * Is 'parameters' present?
marcozecchini 0:9fca2b23d0ba 775 */
marcozecchini 0:9fca2b23d0ba 776 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
marcozecchini 0:9fca2b23d0ba 777 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 0 ) ) == 0 )
marcozecchini 0:9fca2b23d0ba 778 {
marcozecchini 0:9fca2b23d0ba 779 if( ( ret = pk_get_ecparams( &p, p + len, &params) ) != 0 ||
marcozecchini 0:9fca2b23d0ba 780 ( ret = pk_use_ecparams( &params, &eck->grp ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 781 {
marcozecchini 0:9fca2b23d0ba 782 mbedtls_ecp_keypair_free( eck );
marcozecchini 0:9fca2b23d0ba 783 return( ret );
marcozecchini 0:9fca2b23d0ba 784 }
marcozecchini 0:9fca2b23d0ba 785 }
marcozecchini 0:9fca2b23d0ba 786 else if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
marcozecchini 0:9fca2b23d0ba 787 {
marcozecchini 0:9fca2b23d0ba 788 mbedtls_ecp_keypair_free( eck );
marcozecchini 0:9fca2b23d0ba 789 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
marcozecchini 0:9fca2b23d0ba 790 }
marcozecchini 0:9fca2b23d0ba 791
marcozecchini 0:9fca2b23d0ba 792 /*
marcozecchini 0:9fca2b23d0ba 793 * Is 'publickey' present? If not, or if we can't read it (eg because it
marcozecchini 0:9fca2b23d0ba 794 * is compressed), create it from the private key.
marcozecchini 0:9fca2b23d0ba 795 */
marcozecchini 0:9fca2b23d0ba 796 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
marcozecchini 0:9fca2b23d0ba 797 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 1 ) ) == 0 )
marcozecchini 0:9fca2b23d0ba 798 {
marcozecchini 0:9fca2b23d0ba 799 end2 = p + len;
marcozecchini 0:9fca2b23d0ba 800
marcozecchini 0:9fca2b23d0ba 801 if( ( ret = mbedtls_asn1_get_bitstring_null( &p, end2, &len ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 802 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
marcozecchini 0:9fca2b23d0ba 803
marcozecchini 0:9fca2b23d0ba 804 if( p + len != end2 )
marcozecchini 0:9fca2b23d0ba 805 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
marcozecchini 0:9fca2b23d0ba 806 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
marcozecchini 0:9fca2b23d0ba 807
marcozecchini 0:9fca2b23d0ba 808 if( ( ret = pk_get_ecpubkey( &p, end2, eck ) ) == 0 )
marcozecchini 0:9fca2b23d0ba 809 pubkey_done = 1;
marcozecchini 0:9fca2b23d0ba 810 else
marcozecchini 0:9fca2b23d0ba 811 {
marcozecchini 0:9fca2b23d0ba 812 /*
marcozecchini 0:9fca2b23d0ba 813 * The only acceptable failure mode of pk_get_ecpubkey() above
marcozecchini 0:9fca2b23d0ba 814 * is if the point format is not recognized.
marcozecchini 0:9fca2b23d0ba 815 */
marcozecchini 0:9fca2b23d0ba 816 if( ret != MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE )
marcozecchini 0:9fca2b23d0ba 817 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
marcozecchini 0:9fca2b23d0ba 818 }
marcozecchini 0:9fca2b23d0ba 819 }
marcozecchini 0:9fca2b23d0ba 820 else if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
marcozecchini 0:9fca2b23d0ba 821 {
marcozecchini 0:9fca2b23d0ba 822 mbedtls_ecp_keypair_free( eck );
marcozecchini 0:9fca2b23d0ba 823 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
marcozecchini 0:9fca2b23d0ba 824 }
marcozecchini 0:9fca2b23d0ba 825 }
marcozecchini 0:9fca2b23d0ba 826
marcozecchini 0:9fca2b23d0ba 827 if( ! pubkey_done &&
marcozecchini 0:9fca2b23d0ba 828 ( ret = mbedtls_ecp_mul( &eck->grp, &eck->Q, &eck->d, &eck->grp.G,
marcozecchini 0:9fca2b23d0ba 829 NULL, NULL ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 830 {
marcozecchini 0:9fca2b23d0ba 831 mbedtls_ecp_keypair_free( eck );
marcozecchini 0:9fca2b23d0ba 832 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
marcozecchini 0:9fca2b23d0ba 833 }
marcozecchini 0:9fca2b23d0ba 834
marcozecchini 0:9fca2b23d0ba 835 if( ( ret = mbedtls_ecp_check_privkey( &eck->grp, &eck->d ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 836 {
marcozecchini 0:9fca2b23d0ba 837 mbedtls_ecp_keypair_free( eck );
marcozecchini 0:9fca2b23d0ba 838 return( ret );
marcozecchini 0:9fca2b23d0ba 839 }
marcozecchini 0:9fca2b23d0ba 840
marcozecchini 0:9fca2b23d0ba 841 return( 0 );
marcozecchini 0:9fca2b23d0ba 842 }
marcozecchini 0:9fca2b23d0ba 843 #endif /* MBEDTLS_ECP_C */
marcozecchini 0:9fca2b23d0ba 844
marcozecchini 0:9fca2b23d0ba 845 /*
marcozecchini 0:9fca2b23d0ba 846 * Parse an unencrypted PKCS#8 encoded private key
marcozecchini 0:9fca2b23d0ba 847 */
marcozecchini 0:9fca2b23d0ba 848 static int pk_parse_key_pkcs8_unencrypted_der(
marcozecchini 0:9fca2b23d0ba 849 mbedtls_pk_context *pk,
marcozecchini 0:9fca2b23d0ba 850 const unsigned char* key,
marcozecchini 0:9fca2b23d0ba 851 size_t keylen )
marcozecchini 0:9fca2b23d0ba 852 {
marcozecchini 0:9fca2b23d0ba 853 int ret, version;
marcozecchini 0:9fca2b23d0ba 854 size_t len;
marcozecchini 0:9fca2b23d0ba 855 mbedtls_asn1_buf params;
marcozecchini 0:9fca2b23d0ba 856 unsigned char *p = (unsigned char *) key;
marcozecchini 0:9fca2b23d0ba 857 unsigned char *end = p + keylen;
marcozecchini 0:9fca2b23d0ba 858 mbedtls_pk_type_t pk_alg = MBEDTLS_PK_NONE;
marcozecchini 0:9fca2b23d0ba 859 const mbedtls_pk_info_t *pk_info;
marcozecchini 0:9fca2b23d0ba 860
marcozecchini 0:9fca2b23d0ba 861 /*
marcozecchini 0:9fca2b23d0ba 862 * This function parses the PrivatKeyInfo object (PKCS#8 v1.2 = RFC 5208)
marcozecchini 0:9fca2b23d0ba 863 *
marcozecchini 0:9fca2b23d0ba 864 * PrivateKeyInfo ::= SEQUENCE {
marcozecchini 0:9fca2b23d0ba 865 * version Version,
marcozecchini 0:9fca2b23d0ba 866 * privateKeyAlgorithm PrivateKeyAlgorithmIdentifier,
marcozecchini 0:9fca2b23d0ba 867 * privateKey PrivateKey,
marcozecchini 0:9fca2b23d0ba 868 * attributes [0] IMPLICIT Attributes OPTIONAL }
marcozecchini 0:9fca2b23d0ba 869 *
marcozecchini 0:9fca2b23d0ba 870 * Version ::= INTEGER
marcozecchini 0:9fca2b23d0ba 871 * PrivateKeyAlgorithmIdentifier ::= AlgorithmIdentifier
marcozecchini 0:9fca2b23d0ba 872 * PrivateKey ::= OCTET STRING
marcozecchini 0:9fca2b23d0ba 873 *
marcozecchini 0:9fca2b23d0ba 874 * The PrivateKey OCTET STRING is a SEC1 ECPrivateKey
marcozecchini 0:9fca2b23d0ba 875 */
marcozecchini 0:9fca2b23d0ba 876
marcozecchini 0:9fca2b23d0ba 877 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
marcozecchini 0:9fca2b23d0ba 878 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 879 {
marcozecchini 0:9fca2b23d0ba 880 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
marcozecchini 0:9fca2b23d0ba 881 }
marcozecchini 0:9fca2b23d0ba 882
marcozecchini 0:9fca2b23d0ba 883 end = p + len;
marcozecchini 0:9fca2b23d0ba 884
marcozecchini 0:9fca2b23d0ba 885 if( ( ret = mbedtls_asn1_get_int( &p, end, &version ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 886 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
marcozecchini 0:9fca2b23d0ba 887
marcozecchini 0:9fca2b23d0ba 888 if( version != 0 )
marcozecchini 0:9fca2b23d0ba 889 return( MBEDTLS_ERR_PK_KEY_INVALID_VERSION + ret );
marcozecchini 0:9fca2b23d0ba 890
marcozecchini 0:9fca2b23d0ba 891 if( ( ret = pk_get_pk_alg( &p, end, &pk_alg, &params ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 892 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
marcozecchini 0:9fca2b23d0ba 893
marcozecchini 0:9fca2b23d0ba 894 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 895 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
marcozecchini 0:9fca2b23d0ba 896
marcozecchini 0:9fca2b23d0ba 897 if( len < 1 )
marcozecchini 0:9fca2b23d0ba 898 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
marcozecchini 0:9fca2b23d0ba 899 MBEDTLS_ERR_ASN1_OUT_OF_DATA );
marcozecchini 0:9fca2b23d0ba 900
marcozecchini 0:9fca2b23d0ba 901 if( ( pk_info = mbedtls_pk_info_from_type( pk_alg ) ) == NULL )
marcozecchini 0:9fca2b23d0ba 902 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
marcozecchini 0:9fca2b23d0ba 903
marcozecchini 0:9fca2b23d0ba 904 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 905 return( ret );
marcozecchini 0:9fca2b23d0ba 906
marcozecchini 0:9fca2b23d0ba 907 #if defined(MBEDTLS_RSA_C)
marcozecchini 0:9fca2b23d0ba 908 if( pk_alg == MBEDTLS_PK_RSA )
marcozecchini 0:9fca2b23d0ba 909 {
marcozecchini 0:9fca2b23d0ba 910 if( ( ret = pk_parse_key_pkcs1_der( mbedtls_pk_rsa( *pk ), p, len ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 911 {
marcozecchini 0:9fca2b23d0ba 912 mbedtls_pk_free( pk );
marcozecchini 0:9fca2b23d0ba 913 return( ret );
marcozecchini 0:9fca2b23d0ba 914 }
marcozecchini 0:9fca2b23d0ba 915 } else
marcozecchini 0:9fca2b23d0ba 916 #endif /* MBEDTLS_RSA_C */
marcozecchini 0:9fca2b23d0ba 917 #if defined(MBEDTLS_ECP_C)
marcozecchini 0:9fca2b23d0ba 918 if( pk_alg == MBEDTLS_PK_ECKEY || pk_alg == MBEDTLS_PK_ECKEY_DH )
marcozecchini 0:9fca2b23d0ba 919 {
marcozecchini 0:9fca2b23d0ba 920 if( ( ret = pk_use_ecparams( &params, &mbedtls_pk_ec( *pk )->grp ) ) != 0 ||
marcozecchini 0:9fca2b23d0ba 921 ( ret = pk_parse_key_sec1_der( mbedtls_pk_ec( *pk ), p, len ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 922 {
marcozecchini 0:9fca2b23d0ba 923 mbedtls_pk_free( pk );
marcozecchini 0:9fca2b23d0ba 924 return( ret );
marcozecchini 0:9fca2b23d0ba 925 }
marcozecchini 0:9fca2b23d0ba 926 } else
marcozecchini 0:9fca2b23d0ba 927 #endif /* MBEDTLS_ECP_C */
marcozecchini 0:9fca2b23d0ba 928 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
marcozecchini 0:9fca2b23d0ba 929
marcozecchini 0:9fca2b23d0ba 930 return( 0 );
marcozecchini 0:9fca2b23d0ba 931 }
marcozecchini 0:9fca2b23d0ba 932
marcozecchini 0:9fca2b23d0ba 933 /*
marcozecchini 0:9fca2b23d0ba 934 * Parse an encrypted PKCS#8 encoded private key
marcozecchini 0:9fca2b23d0ba 935 */
marcozecchini 0:9fca2b23d0ba 936 #if defined(MBEDTLS_PKCS12_C) || defined(MBEDTLS_PKCS5_C)
marcozecchini 0:9fca2b23d0ba 937 static int pk_parse_key_pkcs8_encrypted_der(
marcozecchini 0:9fca2b23d0ba 938 mbedtls_pk_context *pk,
marcozecchini 0:9fca2b23d0ba 939 const unsigned char *key, size_t keylen,
marcozecchini 0:9fca2b23d0ba 940 const unsigned char *pwd, size_t pwdlen )
marcozecchini 0:9fca2b23d0ba 941 {
marcozecchini 0:9fca2b23d0ba 942 int ret, decrypted = 0;
marcozecchini 0:9fca2b23d0ba 943 size_t len;
marcozecchini 0:9fca2b23d0ba 944 unsigned char buf[2048];
marcozecchini 0:9fca2b23d0ba 945 unsigned char *p, *end;
marcozecchini 0:9fca2b23d0ba 946 mbedtls_asn1_buf pbe_alg_oid, pbe_params;
marcozecchini 0:9fca2b23d0ba 947 #if defined(MBEDTLS_PKCS12_C)
marcozecchini 0:9fca2b23d0ba 948 mbedtls_cipher_type_t cipher_alg;
marcozecchini 0:9fca2b23d0ba 949 mbedtls_md_type_t md_alg;
marcozecchini 0:9fca2b23d0ba 950 #endif
marcozecchini 0:9fca2b23d0ba 951
marcozecchini 0:9fca2b23d0ba 952 memset( buf, 0, sizeof( buf ) );
marcozecchini 0:9fca2b23d0ba 953
marcozecchini 0:9fca2b23d0ba 954 p = (unsigned char *) key;
marcozecchini 0:9fca2b23d0ba 955 end = p + keylen;
marcozecchini 0:9fca2b23d0ba 956
marcozecchini 0:9fca2b23d0ba 957 if( pwdlen == 0 )
marcozecchini 0:9fca2b23d0ba 958 return( MBEDTLS_ERR_PK_PASSWORD_REQUIRED );
marcozecchini 0:9fca2b23d0ba 959
marcozecchini 0:9fca2b23d0ba 960 /*
marcozecchini 0:9fca2b23d0ba 961 * This function parses the EncryptedPrivatKeyInfo object (PKCS#8)
marcozecchini 0:9fca2b23d0ba 962 *
marcozecchini 0:9fca2b23d0ba 963 * EncryptedPrivateKeyInfo ::= SEQUENCE {
marcozecchini 0:9fca2b23d0ba 964 * encryptionAlgorithm EncryptionAlgorithmIdentifier,
marcozecchini 0:9fca2b23d0ba 965 * encryptedData EncryptedData
marcozecchini 0:9fca2b23d0ba 966 * }
marcozecchini 0:9fca2b23d0ba 967 *
marcozecchini 0:9fca2b23d0ba 968 * EncryptionAlgorithmIdentifier ::= AlgorithmIdentifier
marcozecchini 0:9fca2b23d0ba 969 *
marcozecchini 0:9fca2b23d0ba 970 * EncryptedData ::= OCTET STRING
marcozecchini 0:9fca2b23d0ba 971 *
marcozecchini 0:9fca2b23d0ba 972 * The EncryptedData OCTET STRING is a PKCS#8 PrivateKeyInfo
marcozecchini 0:9fca2b23d0ba 973 */
marcozecchini 0:9fca2b23d0ba 974 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
marcozecchini 0:9fca2b23d0ba 975 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 976 {
marcozecchini 0:9fca2b23d0ba 977 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
marcozecchini 0:9fca2b23d0ba 978 }
marcozecchini 0:9fca2b23d0ba 979
marcozecchini 0:9fca2b23d0ba 980 end = p + len;
marcozecchini 0:9fca2b23d0ba 981
marcozecchini 0:9fca2b23d0ba 982 if( ( ret = mbedtls_asn1_get_alg( &p, end, &pbe_alg_oid, &pbe_params ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 983 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
marcozecchini 0:9fca2b23d0ba 984
marcozecchini 0:9fca2b23d0ba 985 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 986 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
marcozecchini 0:9fca2b23d0ba 987
marcozecchini 0:9fca2b23d0ba 988 if( len > sizeof( buf ) )
marcozecchini 0:9fca2b23d0ba 989 return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
marcozecchini 0:9fca2b23d0ba 990
marcozecchini 0:9fca2b23d0ba 991 /*
marcozecchini 0:9fca2b23d0ba 992 * Decrypt EncryptedData with appropriate PDE
marcozecchini 0:9fca2b23d0ba 993 */
marcozecchini 0:9fca2b23d0ba 994 #if defined(MBEDTLS_PKCS12_C)
marcozecchini 0:9fca2b23d0ba 995 if( mbedtls_oid_get_pkcs12_pbe_alg( &pbe_alg_oid, &md_alg, &cipher_alg ) == 0 )
marcozecchini 0:9fca2b23d0ba 996 {
marcozecchini 0:9fca2b23d0ba 997 if( ( ret = mbedtls_pkcs12_pbe( &pbe_params, MBEDTLS_PKCS12_PBE_DECRYPT,
marcozecchini 0:9fca2b23d0ba 998 cipher_alg, md_alg,
marcozecchini 0:9fca2b23d0ba 999 pwd, pwdlen, p, len, buf ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 1000 {
marcozecchini 0:9fca2b23d0ba 1001 if( ret == MBEDTLS_ERR_PKCS12_PASSWORD_MISMATCH )
marcozecchini 0:9fca2b23d0ba 1002 return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
marcozecchini 0:9fca2b23d0ba 1003
marcozecchini 0:9fca2b23d0ba 1004 return( ret );
marcozecchini 0:9fca2b23d0ba 1005 }
marcozecchini 0:9fca2b23d0ba 1006
marcozecchini 0:9fca2b23d0ba 1007 decrypted = 1;
marcozecchini 0:9fca2b23d0ba 1008 }
marcozecchini 0:9fca2b23d0ba 1009 else if( MBEDTLS_OID_CMP( MBEDTLS_OID_PKCS12_PBE_SHA1_RC4_128, &pbe_alg_oid ) == 0 )
marcozecchini 0:9fca2b23d0ba 1010 {
marcozecchini 0:9fca2b23d0ba 1011 if( ( ret = mbedtls_pkcs12_pbe_sha1_rc4_128( &pbe_params,
marcozecchini 0:9fca2b23d0ba 1012 MBEDTLS_PKCS12_PBE_DECRYPT,
marcozecchini 0:9fca2b23d0ba 1013 pwd, pwdlen,
marcozecchini 0:9fca2b23d0ba 1014 p, len, buf ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 1015 {
marcozecchini 0:9fca2b23d0ba 1016 return( ret );
marcozecchini 0:9fca2b23d0ba 1017 }
marcozecchini 0:9fca2b23d0ba 1018
marcozecchini 0:9fca2b23d0ba 1019 // Best guess for password mismatch when using RC4. If first tag is
marcozecchini 0:9fca2b23d0ba 1020 // not MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE
marcozecchini 0:9fca2b23d0ba 1021 //
marcozecchini 0:9fca2b23d0ba 1022 if( *buf != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) )
marcozecchini 0:9fca2b23d0ba 1023 return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
marcozecchini 0:9fca2b23d0ba 1024
marcozecchini 0:9fca2b23d0ba 1025 decrypted = 1;
marcozecchini 0:9fca2b23d0ba 1026 }
marcozecchini 0:9fca2b23d0ba 1027 else
marcozecchini 0:9fca2b23d0ba 1028 #endif /* MBEDTLS_PKCS12_C */
marcozecchini 0:9fca2b23d0ba 1029 #if defined(MBEDTLS_PKCS5_C)
marcozecchini 0:9fca2b23d0ba 1030 if( MBEDTLS_OID_CMP( MBEDTLS_OID_PKCS5_PBES2, &pbe_alg_oid ) == 0 )
marcozecchini 0:9fca2b23d0ba 1031 {
marcozecchini 0:9fca2b23d0ba 1032 if( ( ret = mbedtls_pkcs5_pbes2( &pbe_params, MBEDTLS_PKCS5_DECRYPT, pwd, pwdlen,
marcozecchini 0:9fca2b23d0ba 1033 p, len, buf ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 1034 {
marcozecchini 0:9fca2b23d0ba 1035 if( ret == MBEDTLS_ERR_PKCS5_PASSWORD_MISMATCH )
marcozecchini 0:9fca2b23d0ba 1036 return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
marcozecchini 0:9fca2b23d0ba 1037
marcozecchini 0:9fca2b23d0ba 1038 return( ret );
marcozecchini 0:9fca2b23d0ba 1039 }
marcozecchini 0:9fca2b23d0ba 1040
marcozecchini 0:9fca2b23d0ba 1041 decrypted = 1;
marcozecchini 0:9fca2b23d0ba 1042 }
marcozecchini 0:9fca2b23d0ba 1043 else
marcozecchini 0:9fca2b23d0ba 1044 #endif /* MBEDTLS_PKCS5_C */
marcozecchini 0:9fca2b23d0ba 1045 {
marcozecchini 0:9fca2b23d0ba 1046 ((void) pwd);
marcozecchini 0:9fca2b23d0ba 1047 }
marcozecchini 0:9fca2b23d0ba 1048
marcozecchini 0:9fca2b23d0ba 1049 if( decrypted == 0 )
marcozecchini 0:9fca2b23d0ba 1050 return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
marcozecchini 0:9fca2b23d0ba 1051
marcozecchini 0:9fca2b23d0ba 1052 return( pk_parse_key_pkcs8_unencrypted_der( pk, buf, len ) );
marcozecchini 0:9fca2b23d0ba 1053 }
marcozecchini 0:9fca2b23d0ba 1054 #endif /* MBEDTLS_PKCS12_C || MBEDTLS_PKCS5_C */
marcozecchini 0:9fca2b23d0ba 1055
marcozecchini 0:9fca2b23d0ba 1056 /*
marcozecchini 0:9fca2b23d0ba 1057 * Parse a private key
marcozecchini 0:9fca2b23d0ba 1058 */
marcozecchini 0:9fca2b23d0ba 1059 int mbedtls_pk_parse_key( mbedtls_pk_context *pk,
marcozecchini 0:9fca2b23d0ba 1060 const unsigned char *key, size_t keylen,
marcozecchini 0:9fca2b23d0ba 1061 const unsigned char *pwd, size_t pwdlen )
marcozecchini 0:9fca2b23d0ba 1062 {
marcozecchini 0:9fca2b23d0ba 1063 int ret;
marcozecchini 0:9fca2b23d0ba 1064 const mbedtls_pk_info_t *pk_info;
marcozecchini 0:9fca2b23d0ba 1065
marcozecchini 0:9fca2b23d0ba 1066 #if defined(MBEDTLS_PEM_PARSE_C)
marcozecchini 0:9fca2b23d0ba 1067 size_t len;
marcozecchini 0:9fca2b23d0ba 1068 mbedtls_pem_context pem;
marcozecchini 0:9fca2b23d0ba 1069
marcozecchini 0:9fca2b23d0ba 1070 mbedtls_pem_init( &pem );
marcozecchini 0:9fca2b23d0ba 1071
marcozecchini 0:9fca2b23d0ba 1072 #if defined(MBEDTLS_RSA_C)
marcozecchini 0:9fca2b23d0ba 1073 /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
marcozecchini 0:9fca2b23d0ba 1074 if( keylen == 0 || key[keylen - 1] != '\0' )
marcozecchini 0:9fca2b23d0ba 1075 ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
marcozecchini 0:9fca2b23d0ba 1076 else
marcozecchini 0:9fca2b23d0ba 1077 ret = mbedtls_pem_read_buffer( &pem,
marcozecchini 0:9fca2b23d0ba 1078 "-----BEGIN RSA PRIVATE KEY-----",
marcozecchini 0:9fca2b23d0ba 1079 "-----END RSA PRIVATE KEY-----",
marcozecchini 0:9fca2b23d0ba 1080 key, pwd, pwdlen, &len );
marcozecchini 0:9fca2b23d0ba 1081
marcozecchini 0:9fca2b23d0ba 1082 if( ret == 0 )
marcozecchini 0:9fca2b23d0ba 1083 {
marcozecchini 0:9fca2b23d0ba 1084 if( ( pk_info = mbedtls_pk_info_from_type( MBEDTLS_PK_RSA ) ) == NULL )
marcozecchini 0:9fca2b23d0ba 1085 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
marcozecchini 0:9fca2b23d0ba 1086
marcozecchini 0:9fca2b23d0ba 1087 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 ||
marcozecchini 0:9fca2b23d0ba 1088 ( ret = pk_parse_key_pkcs1_der( mbedtls_pk_rsa( *pk ),
marcozecchini 0:9fca2b23d0ba 1089 pem.buf, pem.buflen ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 1090 {
marcozecchini 0:9fca2b23d0ba 1091 mbedtls_pk_free( pk );
marcozecchini 0:9fca2b23d0ba 1092 }
marcozecchini 0:9fca2b23d0ba 1093
marcozecchini 0:9fca2b23d0ba 1094 mbedtls_pem_free( &pem );
marcozecchini 0:9fca2b23d0ba 1095 return( ret );
marcozecchini 0:9fca2b23d0ba 1096 }
marcozecchini 0:9fca2b23d0ba 1097 else if( ret == MBEDTLS_ERR_PEM_PASSWORD_MISMATCH )
marcozecchini 0:9fca2b23d0ba 1098 return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
marcozecchini 0:9fca2b23d0ba 1099 else if( ret == MBEDTLS_ERR_PEM_PASSWORD_REQUIRED )
marcozecchini 0:9fca2b23d0ba 1100 return( MBEDTLS_ERR_PK_PASSWORD_REQUIRED );
marcozecchini 0:9fca2b23d0ba 1101 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
marcozecchini 0:9fca2b23d0ba 1102 return( ret );
marcozecchini 0:9fca2b23d0ba 1103 #endif /* MBEDTLS_RSA_C */
marcozecchini 0:9fca2b23d0ba 1104
marcozecchini 0:9fca2b23d0ba 1105 #if defined(MBEDTLS_ECP_C)
marcozecchini 0:9fca2b23d0ba 1106 /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
marcozecchini 0:9fca2b23d0ba 1107 if( keylen == 0 || key[keylen - 1] != '\0' )
marcozecchini 0:9fca2b23d0ba 1108 ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
marcozecchini 0:9fca2b23d0ba 1109 else
marcozecchini 0:9fca2b23d0ba 1110 ret = mbedtls_pem_read_buffer( &pem,
marcozecchini 0:9fca2b23d0ba 1111 "-----BEGIN EC PRIVATE KEY-----",
marcozecchini 0:9fca2b23d0ba 1112 "-----END EC PRIVATE KEY-----",
marcozecchini 0:9fca2b23d0ba 1113 key, pwd, pwdlen, &len );
marcozecchini 0:9fca2b23d0ba 1114 if( ret == 0 )
marcozecchini 0:9fca2b23d0ba 1115 {
marcozecchini 0:9fca2b23d0ba 1116 if( ( pk_info = mbedtls_pk_info_from_type( MBEDTLS_PK_ECKEY ) ) == NULL )
marcozecchini 0:9fca2b23d0ba 1117 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
marcozecchini 0:9fca2b23d0ba 1118
marcozecchini 0:9fca2b23d0ba 1119 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 ||
marcozecchini 0:9fca2b23d0ba 1120 ( ret = pk_parse_key_sec1_der( mbedtls_pk_ec( *pk ),
marcozecchini 0:9fca2b23d0ba 1121 pem.buf, pem.buflen ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 1122 {
marcozecchini 0:9fca2b23d0ba 1123 mbedtls_pk_free( pk );
marcozecchini 0:9fca2b23d0ba 1124 }
marcozecchini 0:9fca2b23d0ba 1125
marcozecchini 0:9fca2b23d0ba 1126 mbedtls_pem_free( &pem );
marcozecchini 0:9fca2b23d0ba 1127 return( ret );
marcozecchini 0:9fca2b23d0ba 1128 }
marcozecchini 0:9fca2b23d0ba 1129 else if( ret == MBEDTLS_ERR_PEM_PASSWORD_MISMATCH )
marcozecchini 0:9fca2b23d0ba 1130 return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
marcozecchini 0:9fca2b23d0ba 1131 else if( ret == MBEDTLS_ERR_PEM_PASSWORD_REQUIRED )
marcozecchini 0:9fca2b23d0ba 1132 return( MBEDTLS_ERR_PK_PASSWORD_REQUIRED );
marcozecchini 0:9fca2b23d0ba 1133 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
marcozecchini 0:9fca2b23d0ba 1134 return( ret );
marcozecchini 0:9fca2b23d0ba 1135 #endif /* MBEDTLS_ECP_C */
marcozecchini 0:9fca2b23d0ba 1136
marcozecchini 0:9fca2b23d0ba 1137 /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
marcozecchini 0:9fca2b23d0ba 1138 if( keylen == 0 || key[keylen - 1] != '\0' )
marcozecchini 0:9fca2b23d0ba 1139 ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
marcozecchini 0:9fca2b23d0ba 1140 else
marcozecchini 0:9fca2b23d0ba 1141 ret = mbedtls_pem_read_buffer( &pem,
marcozecchini 0:9fca2b23d0ba 1142 "-----BEGIN PRIVATE KEY-----",
marcozecchini 0:9fca2b23d0ba 1143 "-----END PRIVATE KEY-----",
marcozecchini 0:9fca2b23d0ba 1144 key, NULL, 0, &len );
marcozecchini 0:9fca2b23d0ba 1145 if( ret == 0 )
marcozecchini 0:9fca2b23d0ba 1146 {
marcozecchini 0:9fca2b23d0ba 1147 if( ( ret = pk_parse_key_pkcs8_unencrypted_der( pk,
marcozecchini 0:9fca2b23d0ba 1148 pem.buf, pem.buflen ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 1149 {
marcozecchini 0:9fca2b23d0ba 1150 mbedtls_pk_free( pk );
marcozecchini 0:9fca2b23d0ba 1151 }
marcozecchini 0:9fca2b23d0ba 1152
marcozecchini 0:9fca2b23d0ba 1153 mbedtls_pem_free( &pem );
marcozecchini 0:9fca2b23d0ba 1154 return( ret );
marcozecchini 0:9fca2b23d0ba 1155 }
marcozecchini 0:9fca2b23d0ba 1156 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
marcozecchini 0:9fca2b23d0ba 1157 return( ret );
marcozecchini 0:9fca2b23d0ba 1158
marcozecchini 0:9fca2b23d0ba 1159 #if defined(MBEDTLS_PKCS12_C) || defined(MBEDTLS_PKCS5_C)
marcozecchini 0:9fca2b23d0ba 1160 /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
marcozecchini 0:9fca2b23d0ba 1161 if( keylen == 0 || key[keylen - 1] != '\0' )
marcozecchini 0:9fca2b23d0ba 1162 ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
marcozecchini 0:9fca2b23d0ba 1163 else
marcozecchini 0:9fca2b23d0ba 1164 ret = mbedtls_pem_read_buffer( &pem,
marcozecchini 0:9fca2b23d0ba 1165 "-----BEGIN ENCRYPTED PRIVATE KEY-----",
marcozecchini 0:9fca2b23d0ba 1166 "-----END ENCRYPTED PRIVATE KEY-----",
marcozecchini 0:9fca2b23d0ba 1167 key, NULL, 0, &len );
marcozecchini 0:9fca2b23d0ba 1168 if( ret == 0 )
marcozecchini 0:9fca2b23d0ba 1169 {
marcozecchini 0:9fca2b23d0ba 1170 if( ( ret = pk_parse_key_pkcs8_encrypted_der( pk,
marcozecchini 0:9fca2b23d0ba 1171 pem.buf, pem.buflen,
marcozecchini 0:9fca2b23d0ba 1172 pwd, pwdlen ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 1173 {
marcozecchini 0:9fca2b23d0ba 1174 mbedtls_pk_free( pk );
marcozecchini 0:9fca2b23d0ba 1175 }
marcozecchini 0:9fca2b23d0ba 1176
marcozecchini 0:9fca2b23d0ba 1177 mbedtls_pem_free( &pem );
marcozecchini 0:9fca2b23d0ba 1178 return( ret );
marcozecchini 0:9fca2b23d0ba 1179 }
marcozecchini 0:9fca2b23d0ba 1180 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
marcozecchini 0:9fca2b23d0ba 1181 return( ret );
marcozecchini 0:9fca2b23d0ba 1182 #endif /* MBEDTLS_PKCS12_C || MBEDTLS_PKCS5_C */
marcozecchini 0:9fca2b23d0ba 1183 #else
marcozecchini 0:9fca2b23d0ba 1184 ((void) ret);
marcozecchini 0:9fca2b23d0ba 1185 ((void) pwd);
marcozecchini 0:9fca2b23d0ba 1186 ((void) pwdlen);
marcozecchini 0:9fca2b23d0ba 1187 #endif /* MBEDTLS_PEM_PARSE_C */
marcozecchini 0:9fca2b23d0ba 1188
marcozecchini 0:9fca2b23d0ba 1189 /*
marcozecchini 0:9fca2b23d0ba 1190 * At this point we only know it's not a PEM formatted key. Could be any
marcozecchini 0:9fca2b23d0ba 1191 * of the known DER encoded private key formats
marcozecchini 0:9fca2b23d0ba 1192 *
marcozecchini 0:9fca2b23d0ba 1193 * We try the different DER format parsers to see if one passes without
marcozecchini 0:9fca2b23d0ba 1194 * error
marcozecchini 0:9fca2b23d0ba 1195 */
marcozecchini 0:9fca2b23d0ba 1196 #if defined(MBEDTLS_PKCS12_C) || defined(MBEDTLS_PKCS5_C)
marcozecchini 0:9fca2b23d0ba 1197 if( ( ret = pk_parse_key_pkcs8_encrypted_der( pk, key, keylen,
marcozecchini 0:9fca2b23d0ba 1198 pwd, pwdlen ) ) == 0 )
marcozecchini 0:9fca2b23d0ba 1199 {
marcozecchini 0:9fca2b23d0ba 1200 return( 0 );
marcozecchini 0:9fca2b23d0ba 1201 }
marcozecchini 0:9fca2b23d0ba 1202
marcozecchini 0:9fca2b23d0ba 1203 mbedtls_pk_free( pk );
marcozecchini 0:9fca2b23d0ba 1204
marcozecchini 0:9fca2b23d0ba 1205 if( ret == MBEDTLS_ERR_PK_PASSWORD_MISMATCH )
marcozecchini 0:9fca2b23d0ba 1206 {
marcozecchini 0:9fca2b23d0ba 1207 return( ret );
marcozecchini 0:9fca2b23d0ba 1208 }
marcozecchini 0:9fca2b23d0ba 1209 #endif /* MBEDTLS_PKCS12_C || MBEDTLS_PKCS5_C */
marcozecchini 0:9fca2b23d0ba 1210
marcozecchini 0:9fca2b23d0ba 1211 if( ( ret = pk_parse_key_pkcs8_unencrypted_der( pk, key, keylen ) ) == 0 )
marcozecchini 0:9fca2b23d0ba 1212 return( 0 );
marcozecchini 0:9fca2b23d0ba 1213
marcozecchini 0:9fca2b23d0ba 1214 mbedtls_pk_free( pk );
marcozecchini 0:9fca2b23d0ba 1215
marcozecchini 0:9fca2b23d0ba 1216 #if defined(MBEDTLS_RSA_C)
marcozecchini 0:9fca2b23d0ba 1217 if( ( pk_info = mbedtls_pk_info_from_type( MBEDTLS_PK_RSA ) ) == NULL )
marcozecchini 0:9fca2b23d0ba 1218 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
marcozecchini 0:9fca2b23d0ba 1219
marcozecchini 0:9fca2b23d0ba 1220 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 ||
marcozecchini 0:9fca2b23d0ba 1221 ( ret = pk_parse_key_pkcs1_der( mbedtls_pk_rsa( *pk ), key, keylen ) ) == 0 )
marcozecchini 0:9fca2b23d0ba 1222 {
marcozecchini 0:9fca2b23d0ba 1223 return( 0 );
marcozecchini 0:9fca2b23d0ba 1224 }
marcozecchini 0:9fca2b23d0ba 1225
marcozecchini 0:9fca2b23d0ba 1226 mbedtls_pk_free( pk );
marcozecchini 0:9fca2b23d0ba 1227 #endif /* MBEDTLS_RSA_C */
marcozecchini 0:9fca2b23d0ba 1228
marcozecchini 0:9fca2b23d0ba 1229 #if defined(MBEDTLS_ECP_C)
marcozecchini 0:9fca2b23d0ba 1230 if( ( pk_info = mbedtls_pk_info_from_type( MBEDTLS_PK_ECKEY ) ) == NULL )
marcozecchini 0:9fca2b23d0ba 1231 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
marcozecchini 0:9fca2b23d0ba 1232
marcozecchini 0:9fca2b23d0ba 1233 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 ||
marcozecchini 0:9fca2b23d0ba 1234 ( ret = pk_parse_key_sec1_der( mbedtls_pk_ec( *pk ), key, keylen ) ) == 0 )
marcozecchini 0:9fca2b23d0ba 1235 {
marcozecchini 0:9fca2b23d0ba 1236 return( 0 );
marcozecchini 0:9fca2b23d0ba 1237 }
marcozecchini 0:9fca2b23d0ba 1238
marcozecchini 0:9fca2b23d0ba 1239 mbedtls_pk_free( pk );
marcozecchini 0:9fca2b23d0ba 1240 #endif /* MBEDTLS_ECP_C */
marcozecchini 0:9fca2b23d0ba 1241
marcozecchini 0:9fca2b23d0ba 1242 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
marcozecchini 0:9fca2b23d0ba 1243 }
marcozecchini 0:9fca2b23d0ba 1244
marcozecchini 0:9fca2b23d0ba 1245 /*
marcozecchini 0:9fca2b23d0ba 1246 * Parse a public key
marcozecchini 0:9fca2b23d0ba 1247 */
marcozecchini 0:9fca2b23d0ba 1248 int mbedtls_pk_parse_public_key( mbedtls_pk_context *ctx,
marcozecchini 0:9fca2b23d0ba 1249 const unsigned char *key, size_t keylen )
marcozecchini 0:9fca2b23d0ba 1250 {
marcozecchini 0:9fca2b23d0ba 1251 int ret;
marcozecchini 0:9fca2b23d0ba 1252 unsigned char *p;
marcozecchini 0:9fca2b23d0ba 1253 #if defined(MBEDTLS_PEM_PARSE_C)
marcozecchini 0:9fca2b23d0ba 1254 size_t len;
marcozecchini 0:9fca2b23d0ba 1255 mbedtls_pem_context pem;
marcozecchini 0:9fca2b23d0ba 1256
marcozecchini 0:9fca2b23d0ba 1257 mbedtls_pem_init( &pem );
marcozecchini 0:9fca2b23d0ba 1258
marcozecchini 0:9fca2b23d0ba 1259 /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
marcozecchini 0:9fca2b23d0ba 1260 if( keylen == 0 || key[keylen - 1] != '\0' )
marcozecchini 0:9fca2b23d0ba 1261 ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
marcozecchini 0:9fca2b23d0ba 1262 else
marcozecchini 0:9fca2b23d0ba 1263 ret = mbedtls_pem_read_buffer( &pem,
marcozecchini 0:9fca2b23d0ba 1264 "-----BEGIN PUBLIC KEY-----",
marcozecchini 0:9fca2b23d0ba 1265 "-----END PUBLIC KEY-----",
marcozecchini 0:9fca2b23d0ba 1266 key, NULL, 0, &len );
marcozecchini 0:9fca2b23d0ba 1267
marcozecchini 0:9fca2b23d0ba 1268 if( ret == 0 )
marcozecchini 0:9fca2b23d0ba 1269 {
marcozecchini 0:9fca2b23d0ba 1270 /*
marcozecchini 0:9fca2b23d0ba 1271 * Was PEM encoded
marcozecchini 0:9fca2b23d0ba 1272 */
marcozecchini 0:9fca2b23d0ba 1273 key = pem.buf;
marcozecchini 0:9fca2b23d0ba 1274 keylen = pem.buflen;
marcozecchini 0:9fca2b23d0ba 1275 }
marcozecchini 0:9fca2b23d0ba 1276 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
marcozecchini 0:9fca2b23d0ba 1277 {
marcozecchini 0:9fca2b23d0ba 1278 mbedtls_pem_free( &pem );
marcozecchini 0:9fca2b23d0ba 1279 return( ret );
marcozecchini 0:9fca2b23d0ba 1280 }
marcozecchini 0:9fca2b23d0ba 1281 #endif /* MBEDTLS_PEM_PARSE_C */
marcozecchini 0:9fca2b23d0ba 1282 p = (unsigned char *) key;
marcozecchini 0:9fca2b23d0ba 1283
marcozecchini 0:9fca2b23d0ba 1284 ret = mbedtls_pk_parse_subpubkey( &p, p + keylen, ctx );
marcozecchini 0:9fca2b23d0ba 1285
marcozecchini 0:9fca2b23d0ba 1286 #if defined(MBEDTLS_PEM_PARSE_C)
marcozecchini 0:9fca2b23d0ba 1287 mbedtls_pem_free( &pem );
marcozecchini 0:9fca2b23d0ba 1288 #endif
marcozecchini 0:9fca2b23d0ba 1289
marcozecchini 0:9fca2b23d0ba 1290 return( ret );
marcozecchini 0:9fca2b23d0ba 1291 }
marcozecchini 0:9fca2b23d0ba 1292
marcozecchini 0:9fca2b23d0ba 1293 #endif /* MBEDTLS_PK_PARSE_C */