Nathen Gallardojohnson / WNCInterface

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

Dependencies:   WncControllerK64F

mbedtls/source/pkparse.c@18:198e9b0acf11, 2016-11-17 (annotated)

Committer:
JMF
Date:
Thu Nov 17 16:13:29 2016 +0000
Revision:
18:198e9b0acf11
Parent:
12:0071cb144c7a 
Updates to mbed os resulted in mutex.h going away and rtos.h needed to be used; This fixes the Mutex typedef failure.  Also cast data buffers from 'char *' to (const std::uint8_t*) to conform with Fred's changes in WncController

Who changed what in which revision?

UserRevisionLine numberNew contents of line
JMF 12:0071cb144c7a 1 /*
JMF 12:0071cb144c7a 2 * Public Key layer for parsing key files and structures
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 #if !defined(MBEDTLS_CONFIG_FILE)
JMF 12:0071cb144c7a 23 #include "mbedtls/config.h"
JMF 12:0071cb144c7a 24 #else
JMF 12:0071cb144c7a 25 #include MBEDTLS_CONFIG_FILE
JMF 12:0071cb144c7a 26 #endif
JMF 12:0071cb144c7a 27
JMF 12:0071cb144c7a 28 #if defined(MBEDTLS_PK_PARSE_C)
JMF 12:0071cb144c7a 29
JMF 12:0071cb144c7a 30 #include "mbedtls/pk.h"
JMF 12:0071cb144c7a 31 #include "mbedtls/asn1.h"
JMF 12:0071cb144c7a 32 #include "mbedtls/oid.h"
JMF 12:0071cb144c7a 33
JMF 12:0071cb144c7a 34 #include <string.h>
JMF 12:0071cb144c7a 35
JMF 12:0071cb144c7a 36 #if defined(MBEDTLS_RSA_C)
JMF 12:0071cb144c7a 37 #include "mbedtls/rsa.h"
JMF 12:0071cb144c7a 38 #endif
JMF 12:0071cb144c7a 39 #if defined(MBEDTLS_ECP_C)
JMF 12:0071cb144c7a 40 #include "mbedtls/ecp.h"
JMF 12:0071cb144c7a 41 #endif
JMF 12:0071cb144c7a 42 #if defined(MBEDTLS_ECDSA_C)
JMF 12:0071cb144c7a 43 #include "mbedtls/ecdsa.h"
JMF 12:0071cb144c7a 44 #endif
JMF 12:0071cb144c7a 45 #if defined(MBEDTLS_PEM_PARSE_C)
JMF 12:0071cb144c7a 46 #include "mbedtls/pem.h"
JMF 12:0071cb144c7a 47 #endif
JMF 12:0071cb144c7a 48 #if defined(MBEDTLS_PKCS5_C)
JMF 12:0071cb144c7a 49 #include "mbedtls/pkcs5.h"
JMF 12:0071cb144c7a 50 #endif
JMF 12:0071cb144c7a 51 #if defined(MBEDTLS_PKCS12_C)
JMF 12:0071cb144c7a 52 #include "mbedtls/pkcs12.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 <stdlib.h>
JMF 12:0071cb144c7a 59 #define mbedtls_calloc calloc
JMF 12:0071cb144c7a 60 #define mbedtls_free free
JMF 12:0071cb144c7a 61 #endif
JMF 12:0071cb144c7a 62
JMF 12:0071cb144c7a 63 #if defined(MBEDTLS_FS_IO)
JMF 12:0071cb144c7a 64 /* Implementation that should never be optimized out by the compiler */
JMF 12:0071cb144c7a 65 static void mbedtls_zeroize( void *v, size_t n ) {
JMF 12:0071cb144c7a 66 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
JMF 12:0071cb144c7a 67 }
JMF 12:0071cb144c7a 68
JMF 12:0071cb144c7a 69 /*
JMF 12:0071cb144c7a 70 * Load all data from a file into a given buffer.
JMF 12:0071cb144c7a 71 *
JMF 12:0071cb144c7a 72 * The file is expected to contain either PEM or DER encoded data.
JMF 12:0071cb144c7a 73 * A terminating null byte is always appended. It is included in the announced
JMF 12:0071cb144c7a 74 * length only if the data looks like it is PEM encoded.
JMF 12:0071cb144c7a 75 */
JMF 12:0071cb144c7a 76 int mbedtls_pk_load_file( const char *path, unsigned char **buf, size_t *n )
JMF 12:0071cb144c7a 77 {
JMF 12:0071cb144c7a 78 FILE *f;
JMF 12:0071cb144c7a 79 long size;
JMF 12:0071cb144c7a 80
JMF 12:0071cb144c7a 81 if( ( f = fopen( path, "rb" ) ) == NULL )
JMF 12:0071cb144c7a 82 return( MBEDTLS_ERR_PK_FILE_IO_ERROR );
JMF 12:0071cb144c7a 83
JMF 12:0071cb144c7a 84 fseek( f, 0, SEEK_END );
JMF 12:0071cb144c7a 85 if( ( size = ftell( f ) ) == -1 )
JMF 12:0071cb144c7a 86 {
JMF 12:0071cb144c7a 87 fclose( f );
JMF 12:0071cb144c7a 88 return( MBEDTLS_ERR_PK_FILE_IO_ERROR );
JMF 12:0071cb144c7a 89 }
JMF 12:0071cb144c7a 90 fseek( f, 0, SEEK_SET );
JMF 12:0071cb144c7a 91
JMF 12:0071cb144c7a 92 *n = (size_t) size;
JMF 12:0071cb144c7a 93
JMF 12:0071cb144c7a 94 if( *n + 1 == 0 ||
JMF 12:0071cb144c7a 95 ( *buf = mbedtls_calloc( 1, *n + 1 ) ) == NULL )
JMF 12:0071cb144c7a 96 {
JMF 12:0071cb144c7a 97 fclose( f );
JMF 12:0071cb144c7a 98 return( MBEDTLS_ERR_PK_ALLOC_FAILED );
JMF 12:0071cb144c7a 99 }
JMF 12:0071cb144c7a 100
JMF 12:0071cb144c7a 101 if( fread( *buf, 1, *n, f ) != *n )
JMF 12:0071cb144c7a 102 {
JMF 12:0071cb144c7a 103 fclose( f );
JMF 12:0071cb144c7a 104 mbedtls_free( *buf );
JMF 12:0071cb144c7a 105 return( MBEDTLS_ERR_PK_FILE_IO_ERROR );
JMF 12:0071cb144c7a 106 }
JMF 12:0071cb144c7a 107
JMF 12:0071cb144c7a 108 fclose( f );
JMF 12:0071cb144c7a 109
JMF 12:0071cb144c7a 110 (*buf)[*n] = '\0';
JMF 12:0071cb144c7a 111
JMF 12:0071cb144c7a 112 if( strstr( (const char *) *buf, "-----BEGIN " ) != NULL )
JMF 12:0071cb144c7a 113 ++*n;
JMF 12:0071cb144c7a 114
JMF 12:0071cb144c7a 115 return( 0 );
JMF 12:0071cb144c7a 116 }
JMF 12:0071cb144c7a 117
JMF 12:0071cb144c7a 118 /*
JMF 12:0071cb144c7a 119 * Load and parse a private key
JMF 12:0071cb144c7a 120 */
JMF 12:0071cb144c7a 121 int mbedtls_pk_parse_keyfile( mbedtls_pk_context *ctx,
JMF 12:0071cb144c7a 122 const char *path, const char *pwd )
JMF 12:0071cb144c7a 123 {
JMF 12:0071cb144c7a 124 int ret;
JMF 12:0071cb144c7a 125 size_t n;
JMF 12:0071cb144c7a 126 unsigned char *buf;
JMF 12:0071cb144c7a 127
JMF 12:0071cb144c7a 128 if( ( ret = mbedtls_pk_load_file( path, &buf, &n ) ) != 0 )
JMF 12:0071cb144c7a 129 return( ret );
JMF 12:0071cb144c7a 130
JMF 12:0071cb144c7a 131 if( pwd == NULL )
JMF 12:0071cb144c7a 132 ret = mbedtls_pk_parse_key( ctx, buf, n, NULL, 0 );
JMF 12:0071cb144c7a 133 else
JMF 12:0071cb144c7a 134 ret = mbedtls_pk_parse_key( ctx, buf, n,
JMF 12:0071cb144c7a 135 (const unsigned char *) pwd, strlen( pwd ) );
JMF 12:0071cb144c7a 136
JMF 12:0071cb144c7a 137 mbedtls_zeroize( buf, n );
JMF 12:0071cb144c7a 138 mbedtls_free( buf );
JMF 12:0071cb144c7a 139
JMF 12:0071cb144c7a 140 return( ret );
JMF 12:0071cb144c7a 141 }
JMF 12:0071cb144c7a 142
JMF 12:0071cb144c7a 143 /*
JMF 12:0071cb144c7a 144 * Load and parse a public key
JMF 12:0071cb144c7a 145 */
JMF 12:0071cb144c7a 146 int mbedtls_pk_parse_public_keyfile( mbedtls_pk_context *ctx, const char *path )
JMF 12:0071cb144c7a 147 {
JMF 12:0071cb144c7a 148 int ret;
JMF 12:0071cb144c7a 149 size_t n;
JMF 12:0071cb144c7a 150 unsigned char *buf;
JMF 12:0071cb144c7a 151
JMF 12:0071cb144c7a 152 if( ( ret = mbedtls_pk_load_file( path, &buf, &n ) ) != 0 )
JMF 12:0071cb144c7a 153 return( ret );
JMF 12:0071cb144c7a 154
JMF 12:0071cb144c7a 155 ret = mbedtls_pk_parse_public_key( ctx, buf, n );
JMF 12:0071cb144c7a 156
JMF 12:0071cb144c7a 157 mbedtls_zeroize( buf, n );
JMF 12:0071cb144c7a 158 mbedtls_free( buf );
JMF 12:0071cb144c7a 159
JMF 12:0071cb144c7a 160 return( ret );
JMF 12:0071cb144c7a 161 }
JMF 12:0071cb144c7a 162 #endif /* MBEDTLS_FS_IO */
JMF 12:0071cb144c7a 163
JMF 12:0071cb144c7a 164 #if defined(MBEDTLS_ECP_C)
JMF 12:0071cb144c7a 165 /* Minimally parse an ECParameters buffer to and mbedtls_asn1_buf
JMF 12:0071cb144c7a 166 *
JMF 12:0071cb144c7a 167 * ECParameters ::= CHOICE {
JMF 12:0071cb144c7a 168 * namedCurve OBJECT IDENTIFIER
JMF 12:0071cb144c7a 169 * specifiedCurve SpecifiedECDomain -- = SEQUENCE { ... }
JMF 12:0071cb144c7a 170 * -- implicitCurve NULL
JMF 12:0071cb144c7a 171 * }
JMF 12:0071cb144c7a 172 */
JMF 12:0071cb144c7a 173 static int pk_get_ecparams( unsigned char **p, const unsigned char *end,
JMF 12:0071cb144c7a 174 mbedtls_asn1_buf *params )
JMF 12:0071cb144c7a 175 {
JMF 12:0071cb144c7a 176 int ret;
JMF 12:0071cb144c7a 177
JMF 12:0071cb144c7a 178 /* Tag may be either OID or SEQUENCE */
JMF 12:0071cb144c7a 179 params->tag = **p;
JMF 12:0071cb144c7a 180 if( params->tag != MBEDTLS_ASN1_OID
JMF 12:0071cb144c7a 181 #if defined(MBEDTLS_PK_PARSE_EC_EXTENDED)
JMF 12:0071cb144c7a 182 && params->tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE )
JMF 12:0071cb144c7a 183 #endif
JMF 12:0071cb144c7a 184 )
JMF 12:0071cb144c7a 185 {
JMF 12:0071cb144c7a 186 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
JMF 12:0071cb144c7a 187 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
JMF 12:0071cb144c7a 188 }
JMF 12:0071cb144c7a 189
JMF 12:0071cb144c7a 190 if( ( ret = mbedtls_asn1_get_tag( p, end, &params->len, params->tag ) ) != 0 )
JMF 12:0071cb144c7a 191 {
JMF 12:0071cb144c7a 192 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
JMF 12:0071cb144c7a 193 }
JMF 12:0071cb144c7a 194
JMF 12:0071cb144c7a 195 params->p = *p;
JMF 12:0071cb144c7a 196 *p += params->len;
JMF 12:0071cb144c7a 197
JMF 12:0071cb144c7a 198 if( *p != end )
JMF 12:0071cb144c7a 199 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
JMF 12:0071cb144c7a 200 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
JMF 12:0071cb144c7a 201
JMF 12:0071cb144c7a 202 return( 0 );
JMF 12:0071cb144c7a 203 }
JMF 12:0071cb144c7a 204
JMF 12:0071cb144c7a 205 #if defined(MBEDTLS_PK_PARSE_EC_EXTENDED)
JMF 12:0071cb144c7a 206 /*
JMF 12:0071cb144c7a 207 * Parse a SpecifiedECDomain (SEC 1 C.2) and (mostly) fill the group with it.
JMF 12:0071cb144c7a 208 * WARNING: the resulting group should only be used with
JMF 12:0071cb144c7a 209 * pk_group_id_from_specified(), since its base point may not be set correctly
JMF 12:0071cb144c7a 210 * if it was encoded compressed.
JMF 12:0071cb144c7a 211 *
JMF 12:0071cb144c7a 212 * SpecifiedECDomain ::= SEQUENCE {
JMF 12:0071cb144c7a 213 * version SpecifiedECDomainVersion(ecdpVer1 | ecdpVer2 | ecdpVer3, ...),
JMF 12:0071cb144c7a 214 * fieldID FieldID {{FieldTypes}},
JMF 12:0071cb144c7a 215 * curve Curve,
JMF 12:0071cb144c7a 216 * base ECPoint,
JMF 12:0071cb144c7a 217 * order INTEGER,
JMF 12:0071cb144c7a 218 * cofactor INTEGER OPTIONAL,
JMF 12:0071cb144c7a 219 * hash HashAlgorithm OPTIONAL,
JMF 12:0071cb144c7a 220 * ...
JMF 12:0071cb144c7a 221 * }
JMF 12:0071cb144c7a 222 *
JMF 12:0071cb144c7a 223 * We only support prime-field as field type, and ignore hash and cofactor.
JMF 12:0071cb144c7a 224 */
JMF 12:0071cb144c7a 225 static int pk_group_from_specified( const mbedtls_asn1_buf *params, mbedtls_ecp_group *grp )
JMF 12:0071cb144c7a 226 {
JMF 12:0071cb144c7a 227 int ret;
JMF 12:0071cb144c7a 228 unsigned char *p = params->p;
JMF 12:0071cb144c7a 229 const unsigned char * const end = params->p + params->len;
JMF 12:0071cb144c7a 230 const unsigned char *end_field, *end_curve;
JMF 12:0071cb144c7a 231 size_t len;
JMF 12:0071cb144c7a 232 int ver;
JMF 12:0071cb144c7a 233
JMF 12:0071cb144c7a 234 /* SpecifiedECDomainVersion ::= INTEGER { 1, 2, 3 } */
JMF 12:0071cb144c7a 235 if( ( ret = mbedtls_asn1_get_int( &p, end, &ver ) ) != 0 )
JMF 12:0071cb144c7a 236 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
JMF 12:0071cb144c7a 237
JMF 12:0071cb144c7a 238 if( ver < 1 || ver > 3 )
JMF 12:0071cb144c7a 239 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
JMF 12:0071cb144c7a 240
JMF 12:0071cb144c7a 241 /*
JMF 12:0071cb144c7a 242 * FieldID { FIELD-ID:IOSet } ::= SEQUENCE { -- Finite field
JMF 12:0071cb144c7a 243 * fieldType FIELD-ID.&id({IOSet}),
JMF 12:0071cb144c7a 244 * parameters FIELD-ID.&Type({IOSet}{@fieldType})
JMF 12:0071cb144c7a 245 * }
JMF 12:0071cb144c7a 246 */
JMF 12:0071cb144c7a 247 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
JMF 12:0071cb144c7a 248 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
JMF 12:0071cb144c7a 249 return( ret );
JMF 12:0071cb144c7a 250
JMF 12:0071cb144c7a 251 end_field = p + len;
JMF 12:0071cb144c7a 252
JMF 12:0071cb144c7a 253 /*
JMF 12:0071cb144c7a 254 * FIELD-ID ::= TYPE-IDENTIFIER
JMF 12:0071cb144c7a 255 * FieldTypes FIELD-ID ::= {
JMF 12:0071cb144c7a 256 * { Prime-p IDENTIFIED BY prime-field } |
JMF 12:0071cb144c7a 257 * { Characteristic-two IDENTIFIED BY characteristic-two-field }
JMF 12:0071cb144c7a 258 * }
JMF 12:0071cb144c7a 259 * prime-field OBJECT IDENTIFIER ::= { id-fieldType 1 }
JMF 12:0071cb144c7a 260 */
JMF 12:0071cb144c7a 261 if( ( ret = mbedtls_asn1_get_tag( &p, end_field, &len, MBEDTLS_ASN1_OID ) ) != 0 )
JMF 12:0071cb144c7a 262 return( ret );
JMF 12:0071cb144c7a 263
JMF 12:0071cb144c7a 264 if( len != MBEDTLS_OID_SIZE( MBEDTLS_OID_ANSI_X9_62_PRIME_FIELD ) ||
JMF 12:0071cb144c7a 265 memcmp( p, MBEDTLS_OID_ANSI_X9_62_PRIME_FIELD, len ) != 0 )
JMF 12:0071cb144c7a 266 {
JMF 12:0071cb144c7a 267 return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
JMF 12:0071cb144c7a 268 }
JMF 12:0071cb144c7a 269
JMF 12:0071cb144c7a 270 p += len;
JMF 12:0071cb144c7a 271
JMF 12:0071cb144c7a 272 /* Prime-p ::= INTEGER -- Field of size p. */
JMF 12:0071cb144c7a 273 if( ( ret = mbedtls_asn1_get_mpi( &p, end_field, &grp->P ) ) != 0 )
JMF 12:0071cb144c7a 274 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
JMF 12:0071cb144c7a 275
JMF 12:0071cb144c7a 276 grp->pbits = mbedtls_mpi_bitlen( &grp->P );
JMF 12:0071cb144c7a 277
JMF 12:0071cb144c7a 278 if( p != end_field )
JMF 12:0071cb144c7a 279 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
JMF 12:0071cb144c7a 280 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
JMF 12:0071cb144c7a 281
JMF 12:0071cb144c7a 282 /*
JMF 12:0071cb144c7a 283 * Curve ::= SEQUENCE {
JMF 12:0071cb144c7a 284 * a FieldElement,
JMF 12:0071cb144c7a 285 * b FieldElement,
JMF 12:0071cb144c7a 286 * seed BIT STRING OPTIONAL
JMF 12:0071cb144c7a 287 * -- Shall be present if used in SpecifiedECDomain
JMF 12:0071cb144c7a 288 * -- with version equal to ecdpVer2 or ecdpVer3
JMF 12:0071cb144c7a 289 * }
JMF 12:0071cb144c7a 290 */
JMF 12:0071cb144c7a 291 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
JMF 12:0071cb144c7a 292 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
JMF 12:0071cb144c7a 293 return( ret );
JMF 12:0071cb144c7a 294
JMF 12:0071cb144c7a 295 end_curve = p + len;
JMF 12:0071cb144c7a 296
JMF 12:0071cb144c7a 297 /*
JMF 12:0071cb144c7a 298 * FieldElement ::= OCTET STRING
JMF 12:0071cb144c7a 299 * containing an integer in the case of a prime field
JMF 12:0071cb144c7a 300 */
JMF 12:0071cb144c7a 301 if( ( ret = mbedtls_asn1_get_tag( &p, end_curve, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 ||
JMF 12:0071cb144c7a 302 ( ret = mbedtls_mpi_read_binary( &grp->A, p, len ) ) != 0 )
JMF 12:0071cb144c7a 303 {
JMF 12:0071cb144c7a 304 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
JMF 12:0071cb144c7a 305 }
JMF 12:0071cb144c7a 306
JMF 12:0071cb144c7a 307 p += len;
JMF 12:0071cb144c7a 308
JMF 12:0071cb144c7a 309 if( ( ret = mbedtls_asn1_get_tag( &p, end_curve, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 ||
JMF 12:0071cb144c7a 310 ( ret = mbedtls_mpi_read_binary( &grp->B, p, len ) ) != 0 )
JMF 12:0071cb144c7a 311 {
JMF 12:0071cb144c7a 312 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
JMF 12:0071cb144c7a 313 }
JMF 12:0071cb144c7a 314
JMF 12:0071cb144c7a 315 p += len;
JMF 12:0071cb144c7a 316
JMF 12:0071cb144c7a 317 /* Ignore seed BIT STRING OPTIONAL */
JMF 12:0071cb144c7a 318 if( ( ret = mbedtls_asn1_get_tag( &p, end_curve, &len, MBEDTLS_ASN1_BIT_STRING ) ) == 0 )
JMF 12:0071cb144c7a 319 p += len;
JMF 12:0071cb144c7a 320
JMF 12:0071cb144c7a 321 if( p != end_curve )
JMF 12:0071cb144c7a 322 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
JMF 12:0071cb144c7a 323 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
JMF 12:0071cb144c7a 324
JMF 12:0071cb144c7a 325 /*
JMF 12:0071cb144c7a 326 * ECPoint ::= OCTET STRING
JMF 12:0071cb144c7a 327 */
JMF 12:0071cb144c7a 328 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
JMF 12:0071cb144c7a 329 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
JMF 12:0071cb144c7a 330
JMF 12:0071cb144c7a 331 if( ( ret = mbedtls_ecp_point_read_binary( grp, &grp->G,
JMF 12:0071cb144c7a 332 ( const unsigned char *) p, len ) ) != 0 )
JMF 12:0071cb144c7a 333 {
JMF 12:0071cb144c7a 334 /*
JMF 12:0071cb144c7a 335 * If we can't read the point because it's compressed, cheat by
JMF 12:0071cb144c7a 336 * reading only the X coordinate and the parity bit of Y.
JMF 12:0071cb144c7a 337 */
JMF 12:0071cb144c7a 338 if( ret != MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE ||
JMF 12:0071cb144c7a 339 ( p[0] != 0x02 && p[0] != 0x03 ) ||
JMF 12:0071cb144c7a 340 len != mbedtls_mpi_size( &grp->P ) + 1 ||
JMF 12:0071cb144c7a 341 mbedtls_mpi_read_binary( &grp->G.X, p + 1, len - 1 ) != 0 ||
JMF 12:0071cb144c7a 342 mbedtls_mpi_lset( &grp->G.Y, p[0] - 2 ) != 0 ||
JMF 12:0071cb144c7a 343 mbedtls_mpi_lset( &grp->G.Z, 1 ) != 0 )
JMF 12:0071cb144c7a 344 {
JMF 12:0071cb144c7a 345 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
JMF 12:0071cb144c7a 346 }
JMF 12:0071cb144c7a 347 }
JMF 12:0071cb144c7a 348
JMF 12:0071cb144c7a 349 p += len;
JMF 12:0071cb144c7a 350
JMF 12:0071cb144c7a 351 /*
JMF 12:0071cb144c7a 352 * order INTEGER
JMF 12:0071cb144c7a 353 */
JMF 12:0071cb144c7a 354 if( ( ret = mbedtls_asn1_get_mpi( &p, end, &grp->N ) ) != 0 )
JMF 12:0071cb144c7a 355 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
JMF 12:0071cb144c7a 356
JMF 12:0071cb144c7a 357 grp->nbits = mbedtls_mpi_bitlen( &grp->N );
JMF 12:0071cb144c7a 358
JMF 12:0071cb144c7a 359 /*
JMF 12:0071cb144c7a 360 * Allow optional elements by purposefully not enforcing p == end here.
JMF 12:0071cb144c7a 361 */
JMF 12:0071cb144c7a 362
JMF 12:0071cb144c7a 363 return( 0 );
JMF 12:0071cb144c7a 364 }
JMF 12:0071cb144c7a 365
JMF 12:0071cb144c7a 366 /*
JMF 12:0071cb144c7a 367 * Find the group id associated with an (almost filled) group as generated by
JMF 12:0071cb144c7a 368 * pk_group_from_specified(), or return an error if unknown.
JMF 12:0071cb144c7a 369 */
JMF 12:0071cb144c7a 370 static int pk_group_id_from_group( const mbedtls_ecp_group *grp, mbedtls_ecp_group_id *grp_id )
JMF 12:0071cb144c7a 371 {
JMF 12:0071cb144c7a 372 int ret = 0;
JMF 12:0071cb144c7a 373 mbedtls_ecp_group ref;
JMF 12:0071cb144c7a 374 const mbedtls_ecp_group_id *id;
JMF 12:0071cb144c7a 375
JMF 12:0071cb144c7a 376 mbedtls_ecp_group_init( &ref );
JMF 12:0071cb144c7a 377
JMF 12:0071cb144c7a 378 for( id = mbedtls_ecp_grp_id_list(); *id != MBEDTLS_ECP_DP_NONE; id++ )
JMF 12:0071cb144c7a 379 {
JMF 12:0071cb144c7a 380 /* Load the group associated to that id */
JMF 12:0071cb144c7a 381 mbedtls_ecp_group_free( &ref );
JMF 12:0071cb144c7a 382 MBEDTLS_MPI_CHK( mbedtls_ecp_group_load( &ref, *id ) );
JMF 12:0071cb144c7a 383
JMF 12:0071cb144c7a 384 /* Compare to the group we were given, starting with easy tests */
JMF 12:0071cb144c7a 385 if( grp->pbits == ref.pbits && grp->nbits == ref.nbits &&
JMF 12:0071cb144c7a 386 mbedtls_mpi_cmp_mpi( &grp->P, &ref.P ) == 0 &&
JMF 12:0071cb144c7a 387 mbedtls_mpi_cmp_mpi( &grp->A, &ref.A ) == 0 &&
JMF 12:0071cb144c7a 388 mbedtls_mpi_cmp_mpi( &grp->B, &ref.B ) == 0 &&
JMF 12:0071cb144c7a 389 mbedtls_mpi_cmp_mpi( &grp->N, &ref.N ) == 0 &&
JMF 12:0071cb144c7a 390 mbedtls_mpi_cmp_mpi( &grp->G.X, &ref.G.X ) == 0 &&
JMF 12:0071cb144c7a 391 mbedtls_mpi_cmp_mpi( &grp->G.Z, &ref.G.Z ) == 0 &&
JMF 12:0071cb144c7a 392 /* For Y we may only know the parity bit, so compare only that */
JMF 12:0071cb144c7a 393 mbedtls_mpi_get_bit( &grp->G.Y, 0 ) == mbedtls_mpi_get_bit( &ref.G.Y, 0 ) )
JMF 12:0071cb144c7a 394 {
JMF 12:0071cb144c7a 395 break;
JMF 12:0071cb144c7a 396 }
JMF 12:0071cb144c7a 397
JMF 12:0071cb144c7a 398 }
JMF 12:0071cb144c7a 399
JMF 12:0071cb144c7a 400 cleanup:
JMF 12:0071cb144c7a 401 mbedtls_ecp_group_free( &ref );
JMF 12:0071cb144c7a 402
JMF 12:0071cb144c7a 403 *grp_id = *id;
JMF 12:0071cb144c7a 404
JMF 12:0071cb144c7a 405 if( ret == 0 && *id == MBEDTLS_ECP_DP_NONE )
JMF 12:0071cb144c7a 406 ret = MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE;
JMF 12:0071cb144c7a 407
JMF 12:0071cb144c7a 408 return( ret );
JMF 12:0071cb144c7a 409 }
JMF 12:0071cb144c7a 410
JMF 12:0071cb144c7a 411 /*
JMF 12:0071cb144c7a 412 * Parse a SpecifiedECDomain (SEC 1 C.2) and find the associated group ID
JMF 12:0071cb144c7a 413 */
JMF 12:0071cb144c7a 414 static int pk_group_id_from_specified( const mbedtls_asn1_buf *params,
JMF 12:0071cb144c7a 415 mbedtls_ecp_group_id *grp_id )
JMF 12:0071cb144c7a 416 {
JMF 12:0071cb144c7a 417 int ret;
JMF 12:0071cb144c7a 418 mbedtls_ecp_group grp;
JMF 12:0071cb144c7a 419
JMF 12:0071cb144c7a 420 mbedtls_ecp_group_init( &grp );
JMF 12:0071cb144c7a 421
JMF 12:0071cb144c7a 422 if( ( ret = pk_group_from_specified( params, &grp ) ) != 0 )
JMF 12:0071cb144c7a 423 goto cleanup;
JMF 12:0071cb144c7a 424
JMF 12:0071cb144c7a 425 ret = pk_group_id_from_group( &grp, grp_id );
JMF 12:0071cb144c7a 426
JMF 12:0071cb144c7a 427 cleanup:
JMF 12:0071cb144c7a 428 mbedtls_ecp_group_free( &grp );
JMF 12:0071cb144c7a 429
JMF 12:0071cb144c7a 430 return( ret );
JMF 12:0071cb144c7a 431 }
JMF 12:0071cb144c7a 432 #endif /* MBEDTLS_PK_PARSE_EC_EXTENDED */
JMF 12:0071cb144c7a 433
JMF 12:0071cb144c7a 434 /*
JMF 12:0071cb144c7a 435 * Use EC parameters to initialise an EC group
JMF 12:0071cb144c7a 436 *
JMF 12:0071cb144c7a 437 * ECParameters ::= CHOICE {
JMF 12:0071cb144c7a 438 * namedCurve OBJECT IDENTIFIER
JMF 12:0071cb144c7a 439 * specifiedCurve SpecifiedECDomain -- = SEQUENCE { ... }
JMF 12:0071cb144c7a 440 * -- implicitCurve NULL
JMF 12:0071cb144c7a 441 */
JMF 12:0071cb144c7a 442 static int pk_use_ecparams( const mbedtls_asn1_buf *params, mbedtls_ecp_group *grp )
JMF 12:0071cb144c7a 443 {
JMF 12:0071cb144c7a 444 int ret;
JMF 12:0071cb144c7a 445 mbedtls_ecp_group_id grp_id;
JMF 12:0071cb144c7a 446
JMF 12:0071cb144c7a 447 if( params->tag == MBEDTLS_ASN1_OID )
JMF 12:0071cb144c7a 448 {
JMF 12:0071cb144c7a 449 if( mbedtls_oid_get_ec_grp( params, &grp_id ) != 0 )
JMF 12:0071cb144c7a 450 return( MBEDTLS_ERR_PK_UNKNOWN_NAMED_CURVE );
JMF 12:0071cb144c7a 451 }
JMF 12:0071cb144c7a 452 else
JMF 12:0071cb144c7a 453 {
JMF 12:0071cb144c7a 454 #if defined(MBEDTLS_PK_PARSE_EC_EXTENDED)
JMF 12:0071cb144c7a 455 if( ( ret = pk_group_id_from_specified( params, &grp_id ) ) != 0 )
JMF 12:0071cb144c7a 456 return( ret );
JMF 12:0071cb144c7a 457 #else
JMF 12:0071cb144c7a 458 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
JMF 12:0071cb144c7a 459 #endif
JMF 12:0071cb144c7a 460 }
JMF 12:0071cb144c7a 461
JMF 12:0071cb144c7a 462 /*
JMF 12:0071cb144c7a 463 * grp may already be initilialized; if so, make sure IDs match
JMF 12:0071cb144c7a 464 */
JMF 12:0071cb144c7a 465 if( grp->id != MBEDTLS_ECP_DP_NONE && grp->id != grp_id )
JMF 12:0071cb144c7a 466 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
JMF 12:0071cb144c7a 467
JMF 12:0071cb144c7a 468 if( ( ret = mbedtls_ecp_group_load( grp, grp_id ) ) != 0 )
JMF 12:0071cb144c7a 469 return( ret );
JMF 12:0071cb144c7a 470
JMF 12:0071cb144c7a 471 return( 0 );
JMF 12:0071cb144c7a 472 }
JMF 12:0071cb144c7a 473
JMF 12:0071cb144c7a 474 /*
JMF 12:0071cb144c7a 475 * EC public key is an EC point
JMF 12:0071cb144c7a 476 *
JMF 12:0071cb144c7a 477 * The caller is responsible for clearing the structure upon failure if
JMF 12:0071cb144c7a 478 * desired. Take care to pass along the possible ECP_FEATURE_UNAVAILABLE
JMF 12:0071cb144c7a 479 * return code of mbedtls_ecp_point_read_binary() and leave p in a usable state.
JMF 12:0071cb144c7a 480 */
JMF 12:0071cb144c7a 481 static int pk_get_ecpubkey( unsigned char **p, const unsigned char *end,
JMF 12:0071cb144c7a 482 mbedtls_ecp_keypair *key )
JMF 12:0071cb144c7a 483 {
JMF 12:0071cb144c7a 484 int ret;
JMF 12:0071cb144c7a 485
JMF 12:0071cb144c7a 486 if( ( ret = mbedtls_ecp_point_read_binary( &key->grp, &key->Q,
JMF 12:0071cb144c7a 487 (const unsigned char *) *p, end - *p ) ) == 0 )
JMF 12:0071cb144c7a 488 {
JMF 12:0071cb144c7a 489 ret = mbedtls_ecp_check_pubkey( &key->grp, &key->Q );
JMF 12:0071cb144c7a 490 }
JMF 12:0071cb144c7a 491
JMF 12:0071cb144c7a 492 /*
JMF 12:0071cb144c7a 493 * We know mbedtls_ecp_point_read_binary consumed all bytes or failed
JMF 12:0071cb144c7a 494 */
JMF 12:0071cb144c7a 495 *p = (unsigned char *) end;
JMF 12:0071cb144c7a 496
JMF 12:0071cb144c7a 497 return( ret );
JMF 12:0071cb144c7a 498 }
JMF 12:0071cb144c7a 499 #endif /* MBEDTLS_ECP_C */
JMF 12:0071cb144c7a 500
JMF 12:0071cb144c7a 501 #if defined(MBEDTLS_RSA_C)
JMF 12:0071cb144c7a 502 /*
JMF 12:0071cb144c7a 503 * RSAPublicKey ::= SEQUENCE {
JMF 12:0071cb144c7a 504 * modulus INTEGER, -- n
JMF 12:0071cb144c7a 505 * publicExponent INTEGER -- e
JMF 12:0071cb144c7a 506 * }
JMF 12:0071cb144c7a 507 */
JMF 12:0071cb144c7a 508 static int pk_get_rsapubkey( unsigned char **p,
JMF 12:0071cb144c7a 509 const unsigned char *end,
JMF 12:0071cb144c7a 510 mbedtls_rsa_context *rsa )
JMF 12:0071cb144c7a 511 {
JMF 12:0071cb144c7a 512 int ret;
JMF 12:0071cb144c7a 513 size_t len;
JMF 12:0071cb144c7a 514
JMF 12:0071cb144c7a 515 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
JMF 12:0071cb144c7a 516 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
JMF 12:0071cb144c7a 517 return( MBEDTLS_ERR_PK_INVALID_PUBKEY + ret );
JMF 12:0071cb144c7a 518
JMF 12:0071cb144c7a 519 if( *p + len != end )
JMF 12:0071cb144c7a 520 return( MBEDTLS_ERR_PK_INVALID_PUBKEY +
JMF 12:0071cb144c7a 521 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
JMF 12:0071cb144c7a 522
JMF 12:0071cb144c7a 523 if( ( ret = mbedtls_asn1_get_mpi( p, end, &rsa->N ) ) != 0 ||
JMF 12:0071cb144c7a 524 ( ret = mbedtls_asn1_get_mpi( p, end, &rsa->E ) ) != 0 )
JMF 12:0071cb144c7a 525 return( MBEDTLS_ERR_PK_INVALID_PUBKEY + ret );
JMF 12:0071cb144c7a 526
JMF 12:0071cb144c7a 527 if( *p != end )
JMF 12:0071cb144c7a 528 return( MBEDTLS_ERR_PK_INVALID_PUBKEY +
JMF 12:0071cb144c7a 529 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
JMF 12:0071cb144c7a 530
JMF 12:0071cb144c7a 531 if( ( ret = mbedtls_rsa_check_pubkey( rsa ) ) != 0 )
JMF 12:0071cb144c7a 532 return( MBEDTLS_ERR_PK_INVALID_PUBKEY );
JMF 12:0071cb144c7a 533
JMF 12:0071cb144c7a 534 rsa->len = mbedtls_mpi_size( &rsa->N );
JMF 12:0071cb144c7a 535
JMF 12:0071cb144c7a 536 return( 0 );
JMF 12:0071cb144c7a 537 }
JMF 12:0071cb144c7a 538 #endif /* MBEDTLS_RSA_C */
JMF 12:0071cb144c7a 539
JMF 12:0071cb144c7a 540 /* Get a PK algorithm identifier
JMF 12:0071cb144c7a 541 *
JMF 12:0071cb144c7a 542 * AlgorithmIdentifier ::= SEQUENCE {
JMF 12:0071cb144c7a 543 * algorithm OBJECT IDENTIFIER,
JMF 12:0071cb144c7a 544 * parameters ANY DEFINED BY algorithm OPTIONAL }
JMF 12:0071cb144c7a 545 */
JMF 12:0071cb144c7a 546 static int pk_get_pk_alg( unsigned char **p,
JMF 12:0071cb144c7a 547 const unsigned char *end,
JMF 12:0071cb144c7a 548 mbedtls_pk_type_t *pk_alg, mbedtls_asn1_buf *params )
JMF 12:0071cb144c7a 549 {
JMF 12:0071cb144c7a 550 int ret;
JMF 12:0071cb144c7a 551 mbedtls_asn1_buf alg_oid;
JMF 12:0071cb144c7a 552
JMF 12:0071cb144c7a 553 memset( params, 0, sizeof(mbedtls_asn1_buf) );
JMF 12:0071cb144c7a 554
JMF 12:0071cb144c7a 555 if( ( ret = mbedtls_asn1_get_alg( p, end, &alg_oid, params ) ) != 0 )
JMF 12:0071cb144c7a 556 return( MBEDTLS_ERR_PK_INVALID_ALG + ret );
JMF 12:0071cb144c7a 557
JMF 12:0071cb144c7a 558 if( mbedtls_oid_get_pk_alg( &alg_oid, pk_alg ) != 0 )
JMF 12:0071cb144c7a 559 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
JMF 12:0071cb144c7a 560
JMF 12:0071cb144c7a 561 /*
JMF 12:0071cb144c7a 562 * No parameters with RSA (only for EC)
JMF 12:0071cb144c7a 563 */
JMF 12:0071cb144c7a 564 if( *pk_alg == MBEDTLS_PK_RSA &&
JMF 12:0071cb144c7a 565 ( ( params->tag != MBEDTLS_ASN1_NULL && params->tag != 0 ) ||
JMF 12:0071cb144c7a 566 params->len != 0 ) )
JMF 12:0071cb144c7a 567 {
JMF 12:0071cb144c7a 568 return( MBEDTLS_ERR_PK_INVALID_ALG );
JMF 12:0071cb144c7a 569 }
JMF 12:0071cb144c7a 570
JMF 12:0071cb144c7a 571 return( 0 );
JMF 12:0071cb144c7a 572 }
JMF 12:0071cb144c7a 573
JMF 12:0071cb144c7a 574 /*
JMF 12:0071cb144c7a 575 * SubjectPublicKeyInfo ::= SEQUENCE {
JMF 12:0071cb144c7a 576 * algorithm AlgorithmIdentifier,
JMF 12:0071cb144c7a 577 * subjectPublicKey BIT STRING }
JMF 12:0071cb144c7a 578 */
JMF 12:0071cb144c7a 579 int mbedtls_pk_parse_subpubkey( unsigned char **p, const unsigned char *end,
JMF 12:0071cb144c7a 580 mbedtls_pk_context *pk )
JMF 12:0071cb144c7a 581 {
JMF 12:0071cb144c7a 582 int ret;
JMF 12:0071cb144c7a 583 size_t len;
JMF 12:0071cb144c7a 584 mbedtls_asn1_buf alg_params;
JMF 12:0071cb144c7a 585 mbedtls_pk_type_t pk_alg = MBEDTLS_PK_NONE;
JMF 12:0071cb144c7a 586 const mbedtls_pk_info_t *pk_info;
JMF 12:0071cb144c7a 587
JMF 12:0071cb144c7a 588 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
JMF 12:0071cb144c7a 589 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
JMF 12:0071cb144c7a 590 {
JMF 12:0071cb144c7a 591 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
JMF 12:0071cb144c7a 592 }
JMF 12:0071cb144c7a 593
JMF 12:0071cb144c7a 594 end = *p + len;
JMF 12:0071cb144c7a 595
JMF 12:0071cb144c7a 596 if( ( ret = pk_get_pk_alg( p, end, &pk_alg, &alg_params ) ) != 0 )
JMF 12:0071cb144c7a 597 return( ret );
JMF 12:0071cb144c7a 598
JMF 12:0071cb144c7a 599 if( ( ret = mbedtls_asn1_get_bitstring_null( p, end, &len ) ) != 0 )
JMF 12:0071cb144c7a 600 return( MBEDTLS_ERR_PK_INVALID_PUBKEY + ret );
JMF 12:0071cb144c7a 601
JMF 12:0071cb144c7a 602 if( *p + len != end )
JMF 12:0071cb144c7a 603 return( MBEDTLS_ERR_PK_INVALID_PUBKEY +
JMF 12:0071cb144c7a 604 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
JMF 12:0071cb144c7a 605
JMF 12:0071cb144c7a 606 if( ( pk_info = mbedtls_pk_info_from_type( pk_alg ) ) == NULL )
JMF 12:0071cb144c7a 607 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
JMF 12:0071cb144c7a 608
JMF 12:0071cb144c7a 609 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 )
JMF 12:0071cb144c7a 610 return( ret );
JMF 12:0071cb144c7a 611
JMF 12:0071cb144c7a 612 #if defined(MBEDTLS_RSA_C)
JMF 12:0071cb144c7a 613 if( pk_alg == MBEDTLS_PK_RSA )
JMF 12:0071cb144c7a 614 {
JMF 12:0071cb144c7a 615 ret = pk_get_rsapubkey( p, end, mbedtls_pk_rsa( *pk ) );
JMF 12:0071cb144c7a 616 } else
JMF 12:0071cb144c7a 617 #endif /* MBEDTLS_RSA_C */
JMF 12:0071cb144c7a 618 #if defined(MBEDTLS_ECP_C)
JMF 12:0071cb144c7a 619 if( pk_alg == MBEDTLS_PK_ECKEY_DH || pk_alg == MBEDTLS_PK_ECKEY )
JMF 12:0071cb144c7a 620 {
JMF 12:0071cb144c7a 621 ret = pk_use_ecparams( &alg_params, &mbedtls_pk_ec( *pk )->grp );
JMF 12:0071cb144c7a 622 if( ret == 0 )
JMF 12:0071cb144c7a 623 ret = pk_get_ecpubkey( p, end, mbedtls_pk_ec( *pk ) );
JMF 12:0071cb144c7a 624 } else
JMF 12:0071cb144c7a 625 #endif /* MBEDTLS_ECP_C */
JMF 12:0071cb144c7a 626 ret = MBEDTLS_ERR_PK_UNKNOWN_PK_ALG;
JMF 12:0071cb144c7a 627
JMF 12:0071cb144c7a 628 if( ret == 0 && *p != end )
JMF 12:0071cb144c7a 629 ret = MBEDTLS_ERR_PK_INVALID_PUBKEY
JMF 12:0071cb144c7a 630 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH;
JMF 12:0071cb144c7a 631
JMF 12:0071cb144c7a 632 if( ret != 0 )
JMF 12:0071cb144c7a 633 mbedtls_pk_free( pk );
JMF 12:0071cb144c7a 634
JMF 12:0071cb144c7a 635 return( ret );
JMF 12:0071cb144c7a 636 }
JMF 12:0071cb144c7a 637
JMF 12:0071cb144c7a 638 #if defined(MBEDTLS_RSA_C)
JMF 12:0071cb144c7a 639 /*
JMF 12:0071cb144c7a 640 * Parse a PKCS#1 encoded private RSA key
JMF 12:0071cb144c7a 641 */
JMF 12:0071cb144c7a 642 static int pk_parse_key_pkcs1_der( mbedtls_rsa_context *rsa,
JMF 12:0071cb144c7a 643 const unsigned char *key,
JMF 12:0071cb144c7a 644 size_t keylen )
JMF 12:0071cb144c7a 645 {
JMF 12:0071cb144c7a 646 int ret;
JMF 12:0071cb144c7a 647 size_t len;
JMF 12:0071cb144c7a 648 unsigned char *p, *end;
JMF 12:0071cb144c7a 649
JMF 12:0071cb144c7a 650 p = (unsigned char *) key;
JMF 12:0071cb144c7a 651 end = p + keylen;
JMF 12:0071cb144c7a 652
JMF 12:0071cb144c7a 653 /*
JMF 12:0071cb144c7a 654 * This function parses the RSAPrivateKey (PKCS#1)
JMF 12:0071cb144c7a 655 *
JMF 12:0071cb144c7a 656 * RSAPrivateKey ::= SEQUENCE {
JMF 12:0071cb144c7a 657 * version Version,
JMF 12:0071cb144c7a 658 * modulus INTEGER, -- n
JMF 12:0071cb144c7a 659 * publicExponent INTEGER, -- e
JMF 12:0071cb144c7a 660 * privateExponent INTEGER, -- d
JMF 12:0071cb144c7a 661 * prime1 INTEGER, -- p
JMF 12:0071cb144c7a 662 * prime2 INTEGER, -- q
JMF 12:0071cb144c7a 663 * exponent1 INTEGER, -- d mod (p-1)
JMF 12:0071cb144c7a 664 * exponent2 INTEGER, -- d mod (q-1)
JMF 12:0071cb144c7a 665 * coefficient INTEGER, -- (inverse of q) mod p
JMF 12:0071cb144c7a 666 * otherPrimeInfos OtherPrimeInfos OPTIONAL
JMF 12:0071cb144c7a 667 * }
JMF 12:0071cb144c7a 668 */
JMF 12:0071cb144c7a 669 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
JMF 12:0071cb144c7a 670 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
JMF 12:0071cb144c7a 671 {
JMF 12:0071cb144c7a 672 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
JMF 12:0071cb144c7a 673 }
JMF 12:0071cb144c7a 674
JMF 12:0071cb144c7a 675 end = p + len;
JMF 12:0071cb144c7a 676
JMF 12:0071cb144c7a 677 if( ( ret = mbedtls_asn1_get_int( &p, end, &rsa->ver ) ) != 0 )
JMF 12:0071cb144c7a 678 {
JMF 12:0071cb144c7a 679 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
JMF 12:0071cb144c7a 680 }
JMF 12:0071cb144c7a 681
JMF 12:0071cb144c7a 682 if( rsa->ver != 0 )
JMF 12:0071cb144c7a 683 {
JMF 12:0071cb144c7a 684 return( MBEDTLS_ERR_PK_KEY_INVALID_VERSION );
JMF 12:0071cb144c7a 685 }
JMF 12:0071cb144c7a 686
JMF 12:0071cb144c7a 687 if( ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->N ) ) != 0 ||
JMF 12:0071cb144c7a 688 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->E ) ) != 0 ||
JMF 12:0071cb144c7a 689 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->D ) ) != 0 ||
JMF 12:0071cb144c7a 690 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->P ) ) != 0 ||
JMF 12:0071cb144c7a 691 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->Q ) ) != 0 ||
JMF 12:0071cb144c7a 692 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->DP ) ) != 0 ||
JMF 12:0071cb144c7a 693 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->DQ ) ) != 0 ||
JMF 12:0071cb144c7a 694 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->QP ) ) != 0 )
JMF 12:0071cb144c7a 695 {
JMF 12:0071cb144c7a 696 mbedtls_rsa_free( rsa );
JMF 12:0071cb144c7a 697 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
JMF 12:0071cb144c7a 698 }
JMF 12:0071cb144c7a 699
JMF 12:0071cb144c7a 700 rsa->len = mbedtls_mpi_size( &rsa->N );
JMF 12:0071cb144c7a 701
JMF 12:0071cb144c7a 702 if( p != end )
JMF 12:0071cb144c7a 703 {
JMF 12:0071cb144c7a 704 mbedtls_rsa_free( rsa );
JMF 12:0071cb144c7a 705 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
JMF 12:0071cb144c7a 706 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
JMF 12:0071cb144c7a 707 }
JMF 12:0071cb144c7a 708
JMF 12:0071cb144c7a 709 if( ( ret = mbedtls_rsa_check_privkey( rsa ) ) != 0 )
JMF 12:0071cb144c7a 710 {
JMF 12:0071cb144c7a 711 mbedtls_rsa_free( rsa );
JMF 12:0071cb144c7a 712 return( ret );
JMF 12:0071cb144c7a 713 }
JMF 12:0071cb144c7a 714
JMF 12:0071cb144c7a 715 return( 0 );
JMF 12:0071cb144c7a 716 }
JMF 12:0071cb144c7a 717 #endif /* MBEDTLS_RSA_C */
JMF 12:0071cb144c7a 718
JMF 12:0071cb144c7a 719 #if defined(MBEDTLS_ECP_C)
JMF 12:0071cb144c7a 720 /*
JMF 12:0071cb144c7a 721 * Parse a SEC1 encoded private EC key
JMF 12:0071cb144c7a 722 */
JMF 12:0071cb144c7a 723 static int pk_parse_key_sec1_der( mbedtls_ecp_keypair *eck,
JMF 12:0071cb144c7a 724 const unsigned char *key,
JMF 12:0071cb144c7a 725 size_t keylen )
JMF 12:0071cb144c7a 726 {
JMF 12:0071cb144c7a 727 int ret;
JMF 12:0071cb144c7a 728 int version, pubkey_done;
JMF 12:0071cb144c7a 729 size_t len;
JMF 12:0071cb144c7a 730 mbedtls_asn1_buf params;
JMF 12:0071cb144c7a 731 unsigned char *p = (unsigned char *) key;
JMF 12:0071cb144c7a 732 unsigned char *end = p + keylen;
JMF 12:0071cb144c7a 733 unsigned char *end2;
JMF 12:0071cb144c7a 734
JMF 12:0071cb144c7a 735 /*
JMF 12:0071cb144c7a 736 * RFC 5915, or SEC1 Appendix C.4
JMF 12:0071cb144c7a 737 *
JMF 12:0071cb144c7a 738 * ECPrivateKey ::= SEQUENCE {
JMF 12:0071cb144c7a 739 * version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
JMF 12:0071cb144c7a 740 * privateKey OCTET STRING,
JMF 12:0071cb144c7a 741 * parameters [0] ECParameters {{ NamedCurve }} OPTIONAL,
JMF 12:0071cb144c7a 742 * publicKey [1] BIT STRING OPTIONAL
JMF 12:0071cb144c7a 743 * }
JMF 12:0071cb144c7a 744 */
JMF 12:0071cb144c7a 745 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
JMF 12:0071cb144c7a 746 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
JMF 12:0071cb144c7a 747 {
JMF 12:0071cb144c7a 748 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
JMF 12:0071cb144c7a 749 }
JMF 12:0071cb144c7a 750
JMF 12:0071cb144c7a 751 end = p + len;
JMF 12:0071cb144c7a 752
JMF 12:0071cb144c7a 753 if( ( ret = mbedtls_asn1_get_int( &p, end, &version ) ) != 0 )
JMF 12:0071cb144c7a 754 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
JMF 12:0071cb144c7a 755
JMF 12:0071cb144c7a 756 if( version != 1 )
JMF 12:0071cb144c7a 757 return( MBEDTLS_ERR_PK_KEY_INVALID_VERSION );
JMF 12:0071cb144c7a 758
JMF 12:0071cb144c7a 759 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
JMF 12:0071cb144c7a 760 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
JMF 12:0071cb144c7a 761
JMF 12:0071cb144c7a 762 if( ( ret = mbedtls_mpi_read_binary( &eck->d, p, len ) ) != 0 )
JMF 12:0071cb144c7a 763 {
JMF 12:0071cb144c7a 764 mbedtls_ecp_keypair_free( eck );
JMF 12:0071cb144c7a 765 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
JMF 12:0071cb144c7a 766 }
JMF 12:0071cb144c7a 767
JMF 12:0071cb144c7a 768 p += len;
JMF 12:0071cb144c7a 769
JMF 12:0071cb144c7a 770 pubkey_done = 0;
JMF 12:0071cb144c7a 771 if( p != end )
JMF 12:0071cb144c7a 772 {
JMF 12:0071cb144c7a 773 /*
JMF 12:0071cb144c7a 774 * Is 'parameters' present?
JMF 12:0071cb144c7a 775 */
JMF 12:0071cb144c7a 776 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
JMF 12:0071cb144c7a 777 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 0 ) ) == 0 )
JMF 12:0071cb144c7a 778 {
JMF 12:0071cb144c7a 779 if( ( ret = pk_get_ecparams( &p, p + len, &params) ) != 0 ||
JMF 12:0071cb144c7a 780 ( ret = pk_use_ecparams( &params, &eck->grp ) ) != 0 )
JMF 12:0071cb144c7a 781 {
JMF 12:0071cb144c7a 782 mbedtls_ecp_keypair_free( eck );
JMF 12:0071cb144c7a 783 return( ret );
JMF 12:0071cb144c7a 784 }
JMF 12:0071cb144c7a 785 }
JMF 12:0071cb144c7a 786 else if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
JMF 12:0071cb144c7a 787 {
JMF 12:0071cb144c7a 788 mbedtls_ecp_keypair_free( eck );
JMF 12:0071cb144c7a 789 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
JMF 12:0071cb144c7a 790 }
JMF 12:0071cb144c7a 791
JMF 12:0071cb144c7a 792 /*
JMF 12:0071cb144c7a 793 * Is 'publickey' present? If not, or if we can't read it (eg because it
JMF 12:0071cb144c7a 794 * is compressed), create it from the private key.
JMF 12:0071cb144c7a 795 */
JMF 12:0071cb144c7a 796 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
JMF 12:0071cb144c7a 797 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 1 ) ) == 0 )
JMF 12:0071cb144c7a 798 {
JMF 12:0071cb144c7a 799 end2 = p + len;
JMF 12:0071cb144c7a 800
JMF 12:0071cb144c7a 801 if( ( ret = mbedtls_asn1_get_bitstring_null( &p, end2, &len ) ) != 0 )
JMF 12:0071cb144c7a 802 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
JMF 12:0071cb144c7a 803
JMF 12:0071cb144c7a 804 if( p + len != end2 )
JMF 12:0071cb144c7a 805 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
JMF 12:0071cb144c7a 806 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
JMF 12:0071cb144c7a 807
JMF 12:0071cb144c7a 808 if( ( ret = pk_get_ecpubkey( &p, end2, eck ) ) == 0 )
JMF 12:0071cb144c7a 809 pubkey_done = 1;
JMF 12:0071cb144c7a 810 else
JMF 12:0071cb144c7a 811 {
JMF 12:0071cb144c7a 812 /*
JMF 12:0071cb144c7a 813 * The only acceptable failure mode of pk_get_ecpubkey() above
JMF 12:0071cb144c7a 814 * is if the point format is not recognized.
JMF 12:0071cb144c7a 815 */
JMF 12:0071cb144c7a 816 if( ret != MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE )
JMF 12:0071cb144c7a 817 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
JMF 12:0071cb144c7a 818 }
JMF 12:0071cb144c7a 819 }
JMF 12:0071cb144c7a 820 else if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
JMF 12:0071cb144c7a 821 {
JMF 12:0071cb144c7a 822 mbedtls_ecp_keypair_free( eck );
JMF 12:0071cb144c7a 823 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
JMF 12:0071cb144c7a 824 }
JMF 12:0071cb144c7a 825 }
JMF 12:0071cb144c7a 826
JMF 12:0071cb144c7a 827 if( ! pubkey_done &&
JMF 12:0071cb144c7a 828 ( ret = mbedtls_ecp_mul( &eck->grp, &eck->Q, &eck->d, &eck->grp.G,
JMF 12:0071cb144c7a 829 NULL, NULL ) ) != 0 )
JMF 12:0071cb144c7a 830 {
JMF 12:0071cb144c7a 831 mbedtls_ecp_keypair_free( eck );
JMF 12:0071cb144c7a 832 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
JMF 12:0071cb144c7a 833 }
JMF 12:0071cb144c7a 834
JMF 12:0071cb144c7a 835 if( ( ret = mbedtls_ecp_check_privkey( &eck->grp, &eck->d ) ) != 0 )
JMF 12:0071cb144c7a 836 {
JMF 12:0071cb144c7a 837 mbedtls_ecp_keypair_free( eck );
JMF 12:0071cb144c7a 838 return( ret );
JMF 12:0071cb144c7a 839 }
JMF 12:0071cb144c7a 840
JMF 12:0071cb144c7a 841 return( 0 );
JMF 12:0071cb144c7a 842 }
JMF 12:0071cb144c7a 843 #endif /* MBEDTLS_ECP_C */
JMF 12:0071cb144c7a 844
JMF 12:0071cb144c7a 845 /*
JMF 12:0071cb144c7a 846 * Parse an unencrypted PKCS#8 encoded private key
JMF 12:0071cb144c7a 847 */
JMF 12:0071cb144c7a 848 static int pk_parse_key_pkcs8_unencrypted_der(
JMF 12:0071cb144c7a 849 mbedtls_pk_context *pk,
JMF 12:0071cb144c7a 850 const unsigned char* key,
JMF 12:0071cb144c7a 851 size_t keylen )
JMF 12:0071cb144c7a 852 {
JMF 12:0071cb144c7a 853 int ret, version;
JMF 12:0071cb144c7a 854 size_t len;
JMF 12:0071cb144c7a 855 mbedtls_asn1_buf params;
JMF 12:0071cb144c7a 856 unsigned char *p = (unsigned char *) key;
JMF 12:0071cb144c7a 857 unsigned char *end = p + keylen;
JMF 12:0071cb144c7a 858 mbedtls_pk_type_t pk_alg = MBEDTLS_PK_NONE;
JMF 12:0071cb144c7a 859 const mbedtls_pk_info_t *pk_info;
JMF 12:0071cb144c7a 860
JMF 12:0071cb144c7a 861 /*
JMF 12:0071cb144c7a 862 * This function parses the PrivatKeyInfo object (PKCS#8 v1.2 = RFC 5208)
JMF 12:0071cb144c7a 863 *
JMF 12:0071cb144c7a 864 * PrivateKeyInfo ::= SEQUENCE {
JMF 12:0071cb144c7a 865 * version Version,
JMF 12:0071cb144c7a 866 * privateKeyAlgorithm PrivateKeyAlgorithmIdentifier,
JMF 12:0071cb144c7a 867 * privateKey PrivateKey,
JMF 12:0071cb144c7a 868 * attributes [0] IMPLICIT Attributes OPTIONAL }
JMF 12:0071cb144c7a 869 *
JMF 12:0071cb144c7a 870 * Version ::= INTEGER
JMF 12:0071cb144c7a 871 * PrivateKeyAlgorithmIdentifier ::= AlgorithmIdentifier
JMF 12:0071cb144c7a 872 * PrivateKey ::= OCTET STRING
JMF 12:0071cb144c7a 873 *
JMF 12:0071cb144c7a 874 * The PrivateKey OCTET STRING is a SEC1 ECPrivateKey
JMF 12:0071cb144c7a 875 */
JMF 12:0071cb144c7a 876
JMF 12:0071cb144c7a 877 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
JMF 12:0071cb144c7a 878 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
JMF 12:0071cb144c7a 879 {
JMF 12:0071cb144c7a 880 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
JMF 12:0071cb144c7a 881 }
JMF 12:0071cb144c7a 882
JMF 12:0071cb144c7a 883 end = p + len;
JMF 12:0071cb144c7a 884
JMF 12:0071cb144c7a 885 if( ( ret = mbedtls_asn1_get_int( &p, end, &version ) ) != 0 )
JMF 12:0071cb144c7a 886 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
JMF 12:0071cb144c7a 887
JMF 12:0071cb144c7a 888 if( version != 0 )
JMF 12:0071cb144c7a 889 return( MBEDTLS_ERR_PK_KEY_INVALID_VERSION + ret );
JMF 12:0071cb144c7a 890
JMF 12:0071cb144c7a 891 if( ( ret = pk_get_pk_alg( &p, end, &pk_alg, &params ) ) != 0 )
JMF 12:0071cb144c7a 892 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
JMF 12:0071cb144c7a 893
JMF 12:0071cb144c7a 894 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
JMF 12:0071cb144c7a 895 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
JMF 12:0071cb144c7a 896
JMF 12:0071cb144c7a 897 if( len < 1 )
JMF 12:0071cb144c7a 898 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
JMF 12:0071cb144c7a 899 MBEDTLS_ERR_ASN1_OUT_OF_DATA );
JMF 12:0071cb144c7a 900
JMF 12:0071cb144c7a 901 if( ( pk_info = mbedtls_pk_info_from_type( pk_alg ) ) == NULL )
JMF 12:0071cb144c7a 902 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
JMF 12:0071cb144c7a 903
JMF 12:0071cb144c7a 904 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 )
JMF 12:0071cb144c7a 905 return( ret );
JMF 12:0071cb144c7a 906
JMF 12:0071cb144c7a 907 #if defined(MBEDTLS_RSA_C)
JMF 12:0071cb144c7a 908 if( pk_alg == MBEDTLS_PK_RSA )
JMF 12:0071cb144c7a 909 {
JMF 12:0071cb144c7a 910 if( ( ret = pk_parse_key_pkcs1_der( mbedtls_pk_rsa( *pk ), p, len ) ) != 0 )
JMF 12:0071cb144c7a 911 {
JMF 12:0071cb144c7a 912 mbedtls_pk_free( pk );
JMF 12:0071cb144c7a 913 return( ret );
JMF 12:0071cb144c7a 914 }
JMF 12:0071cb144c7a 915 } else
JMF 12:0071cb144c7a 916 #endif /* MBEDTLS_RSA_C */
JMF 12:0071cb144c7a 917 #if defined(MBEDTLS_ECP_C)
JMF 12:0071cb144c7a 918 if( pk_alg == MBEDTLS_PK_ECKEY || pk_alg == MBEDTLS_PK_ECKEY_DH )
JMF 12:0071cb144c7a 919 {
JMF 12:0071cb144c7a 920 if( ( ret = pk_use_ecparams( &params, &mbedtls_pk_ec( *pk )->grp ) ) != 0 ||
JMF 12:0071cb144c7a 921 ( ret = pk_parse_key_sec1_der( mbedtls_pk_ec( *pk ), p, len ) ) != 0 )
JMF 12:0071cb144c7a 922 {
JMF 12:0071cb144c7a 923 mbedtls_pk_free( pk );
JMF 12:0071cb144c7a 924 return( ret );
JMF 12:0071cb144c7a 925 }
JMF 12:0071cb144c7a 926 } else
JMF 12:0071cb144c7a 927 #endif /* MBEDTLS_ECP_C */
JMF 12:0071cb144c7a 928 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
JMF 12:0071cb144c7a 929
JMF 12:0071cb144c7a 930 return( 0 );
JMF 12:0071cb144c7a 931 }
JMF 12:0071cb144c7a 932
JMF 12:0071cb144c7a 933 /*
JMF 12:0071cb144c7a 934 * Parse an encrypted PKCS#8 encoded private key
JMF 12:0071cb144c7a 935 */
JMF 12:0071cb144c7a 936 #if defined(MBEDTLS_PKCS12_C) || defined(MBEDTLS_PKCS5_C)
JMF 12:0071cb144c7a 937 static int pk_parse_key_pkcs8_encrypted_der(
JMF 12:0071cb144c7a 938 mbedtls_pk_context *pk,
JMF 12:0071cb144c7a 939 const unsigned char *key, size_t keylen,
JMF 12:0071cb144c7a 940 const unsigned char *pwd, size_t pwdlen )
JMF 12:0071cb144c7a 941 {
JMF 12:0071cb144c7a 942 int ret, decrypted = 0;
JMF 12:0071cb144c7a 943 size_t len;
JMF 12:0071cb144c7a 944 unsigned char buf[2048];
JMF 12:0071cb144c7a 945 unsigned char *p, *end;
JMF 12:0071cb144c7a 946 mbedtls_asn1_buf pbe_alg_oid, pbe_params;
JMF 12:0071cb144c7a 947 #if defined(MBEDTLS_PKCS12_C)
JMF 12:0071cb144c7a 948 mbedtls_cipher_type_t cipher_alg;
JMF 12:0071cb144c7a 949 mbedtls_md_type_t md_alg;
JMF 12:0071cb144c7a 950 #endif
JMF 12:0071cb144c7a 951
JMF 12:0071cb144c7a 952 memset( buf, 0, sizeof( buf ) );
JMF 12:0071cb144c7a 953
JMF 12:0071cb144c7a 954 p = (unsigned char *) key;
JMF 12:0071cb144c7a 955 end = p + keylen;
JMF 12:0071cb144c7a 956
JMF 12:0071cb144c7a 957 if( pwdlen == 0 )
JMF 12:0071cb144c7a 958 return( MBEDTLS_ERR_PK_PASSWORD_REQUIRED );
JMF 12:0071cb144c7a 959
JMF 12:0071cb144c7a 960 /*
JMF 12:0071cb144c7a 961 * This function parses the EncryptedPrivatKeyInfo object (PKCS#8)
JMF 12:0071cb144c7a 962 *
JMF 12:0071cb144c7a 963 * EncryptedPrivateKeyInfo ::= SEQUENCE {
JMF 12:0071cb144c7a 964 * encryptionAlgorithm EncryptionAlgorithmIdentifier,
JMF 12:0071cb144c7a 965 * encryptedData EncryptedData
JMF 12:0071cb144c7a 966 * }
JMF 12:0071cb144c7a 967 *
JMF 12:0071cb144c7a 968 * EncryptionAlgorithmIdentifier ::= AlgorithmIdentifier
JMF 12:0071cb144c7a 969 *
JMF 12:0071cb144c7a 970 * EncryptedData ::= OCTET STRING
JMF 12:0071cb144c7a 971 *
JMF 12:0071cb144c7a 972 * The EncryptedData OCTET STRING is a PKCS#8 PrivateKeyInfo
JMF 12:0071cb144c7a 973 */
JMF 12:0071cb144c7a 974 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
JMF 12:0071cb144c7a 975 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
JMF 12:0071cb144c7a 976 {
JMF 12:0071cb144c7a 977 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
JMF 12:0071cb144c7a 978 }
JMF 12:0071cb144c7a 979
JMF 12:0071cb144c7a 980 end = p + len;
JMF 12:0071cb144c7a 981
JMF 12:0071cb144c7a 982 if( ( ret = mbedtls_asn1_get_alg( &p, end, &pbe_alg_oid, &pbe_params ) ) != 0 )
JMF 12:0071cb144c7a 983 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
JMF 12:0071cb144c7a 984
JMF 12:0071cb144c7a 985 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
JMF 12:0071cb144c7a 986 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
JMF 12:0071cb144c7a 987
JMF 12:0071cb144c7a 988 if( len > sizeof( buf ) )
JMF 12:0071cb144c7a 989 return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
JMF 12:0071cb144c7a 990
JMF 12:0071cb144c7a 991 /*
JMF 12:0071cb144c7a 992 * Decrypt EncryptedData with appropriate PDE
JMF 12:0071cb144c7a 993 */
JMF 12:0071cb144c7a 994 #if defined(MBEDTLS_PKCS12_C)
JMF 12:0071cb144c7a 995 if( mbedtls_oid_get_pkcs12_pbe_alg( &pbe_alg_oid, &md_alg, &cipher_alg ) == 0 )
JMF 12:0071cb144c7a 996 {
JMF 12:0071cb144c7a 997 if( ( ret = mbedtls_pkcs12_pbe( &pbe_params, MBEDTLS_PKCS12_PBE_DECRYPT,
JMF 12:0071cb144c7a 998 cipher_alg, md_alg,
JMF 12:0071cb144c7a 999 pwd, pwdlen, p, len, buf ) ) != 0 )
JMF 12:0071cb144c7a 1000 {
JMF 12:0071cb144c7a 1001 if( ret == MBEDTLS_ERR_PKCS12_PASSWORD_MISMATCH )
JMF 12:0071cb144c7a 1002 return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
JMF 12:0071cb144c7a 1003
JMF 12:0071cb144c7a 1004 return( ret );
JMF 12:0071cb144c7a 1005 }
JMF 12:0071cb144c7a 1006
JMF 12:0071cb144c7a 1007 decrypted = 1;
JMF 12:0071cb144c7a 1008 }
JMF 12:0071cb144c7a 1009 else if( MBEDTLS_OID_CMP( MBEDTLS_OID_PKCS12_PBE_SHA1_RC4_128, &pbe_alg_oid ) == 0 )
JMF 12:0071cb144c7a 1010 {
JMF 12:0071cb144c7a 1011 if( ( ret = mbedtls_pkcs12_pbe_sha1_rc4_128( &pbe_params,
JMF 12:0071cb144c7a 1012 MBEDTLS_PKCS12_PBE_DECRYPT,
JMF 12:0071cb144c7a 1013 pwd, pwdlen,
JMF 12:0071cb144c7a 1014 p, len, buf ) ) != 0 )
JMF 12:0071cb144c7a 1015 {
JMF 12:0071cb144c7a 1016 return( ret );
JMF 12:0071cb144c7a 1017 }
JMF 12:0071cb144c7a 1018
JMF 12:0071cb144c7a 1019 // Best guess for password mismatch when using RC4. If first tag is
JMF 12:0071cb144c7a 1020 // not MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE
JMF 12:0071cb144c7a 1021 //
JMF 12:0071cb144c7a 1022 if( *buf != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) )
JMF 12:0071cb144c7a 1023 return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
JMF 12:0071cb144c7a 1024
JMF 12:0071cb144c7a 1025 decrypted = 1;
JMF 12:0071cb144c7a 1026 }
JMF 12:0071cb144c7a 1027 else
JMF 12:0071cb144c7a 1028 #endif /* MBEDTLS_PKCS12_C */
JMF 12:0071cb144c7a 1029 #if defined(MBEDTLS_PKCS5_C)
JMF 12:0071cb144c7a 1030 if( MBEDTLS_OID_CMP( MBEDTLS_OID_PKCS5_PBES2, &pbe_alg_oid ) == 0 )
JMF 12:0071cb144c7a 1031 {
JMF 12:0071cb144c7a 1032 if( ( ret = mbedtls_pkcs5_pbes2( &pbe_params, MBEDTLS_PKCS5_DECRYPT, pwd, pwdlen,
JMF 12:0071cb144c7a 1033 p, len, buf ) ) != 0 )
JMF 12:0071cb144c7a 1034 {
JMF 12:0071cb144c7a 1035 if( ret == MBEDTLS_ERR_PKCS5_PASSWORD_MISMATCH )
JMF 12:0071cb144c7a 1036 return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
JMF 12:0071cb144c7a 1037
JMF 12:0071cb144c7a 1038 return( ret );
JMF 12:0071cb144c7a 1039 }
JMF 12:0071cb144c7a 1040
JMF 12:0071cb144c7a 1041 decrypted = 1;
JMF 12:0071cb144c7a 1042 }
JMF 12:0071cb144c7a 1043 else
JMF 12:0071cb144c7a 1044 #endif /* MBEDTLS_PKCS5_C */
JMF 12:0071cb144c7a 1045 {
JMF 12:0071cb144c7a 1046 ((void) pwd);
JMF 12:0071cb144c7a 1047 }
JMF 12:0071cb144c7a 1048
JMF 12:0071cb144c7a 1049 if( decrypted == 0 )
JMF 12:0071cb144c7a 1050 return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
JMF 12:0071cb144c7a 1051
JMF 12:0071cb144c7a 1052 return( pk_parse_key_pkcs8_unencrypted_der( pk, buf, len ) );
JMF 12:0071cb144c7a 1053 }
JMF 12:0071cb144c7a 1054 #endif /* MBEDTLS_PKCS12_C || MBEDTLS_PKCS5_C */
JMF 12:0071cb144c7a 1055
JMF 12:0071cb144c7a 1056 /*
JMF 12:0071cb144c7a 1057 * Parse a private key
JMF 12:0071cb144c7a 1058 */
JMF 12:0071cb144c7a 1059 int mbedtls_pk_parse_key( mbedtls_pk_context *pk,
JMF 12:0071cb144c7a 1060 const unsigned char *key, size_t keylen,
JMF 12:0071cb144c7a 1061 const unsigned char *pwd, size_t pwdlen )
JMF 12:0071cb144c7a 1062 {
JMF 12:0071cb144c7a 1063 int ret;
JMF 12:0071cb144c7a 1064 const mbedtls_pk_info_t *pk_info;
JMF 12:0071cb144c7a 1065
JMF 12:0071cb144c7a 1066 #if defined(MBEDTLS_PEM_PARSE_C)
JMF 12:0071cb144c7a 1067 size_t len;
JMF 12:0071cb144c7a 1068 mbedtls_pem_context pem;
JMF 12:0071cb144c7a 1069
JMF 12:0071cb144c7a 1070 mbedtls_pem_init( &pem );
JMF 12:0071cb144c7a 1071
JMF 12:0071cb144c7a 1072 #if defined(MBEDTLS_RSA_C)
JMF 12:0071cb144c7a 1073 /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
JMF 12:0071cb144c7a 1074 if( keylen == 0 || key[keylen - 1] != '\0' )
JMF 12:0071cb144c7a 1075 ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
JMF 12:0071cb144c7a 1076 else
JMF 12:0071cb144c7a 1077 ret = mbedtls_pem_read_buffer( &pem,
JMF 12:0071cb144c7a 1078 "-----BEGIN RSA PRIVATE KEY-----",
JMF 12:0071cb144c7a 1079 "-----END RSA PRIVATE KEY-----",
JMF 12:0071cb144c7a 1080 key, pwd, pwdlen, &len );
JMF 12:0071cb144c7a 1081
JMF 12:0071cb144c7a 1082 if( ret == 0 )
JMF 12:0071cb144c7a 1083 {
JMF 12:0071cb144c7a 1084 if( ( pk_info = mbedtls_pk_info_from_type( MBEDTLS_PK_RSA ) ) == NULL )
JMF 12:0071cb144c7a 1085 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
JMF 12:0071cb144c7a 1086
JMF 12:0071cb144c7a 1087 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 ||
JMF 12:0071cb144c7a 1088 ( ret = pk_parse_key_pkcs1_der( mbedtls_pk_rsa( *pk ),
JMF 12:0071cb144c7a 1089 pem.buf, pem.buflen ) ) != 0 )
JMF 12:0071cb144c7a 1090 {
JMF 12:0071cb144c7a 1091 mbedtls_pk_free( pk );
JMF 12:0071cb144c7a 1092 }
JMF 12:0071cb144c7a 1093
JMF 12:0071cb144c7a 1094 mbedtls_pem_free( &pem );
JMF 12:0071cb144c7a 1095 return( ret );
JMF 12:0071cb144c7a 1096 }
JMF 12:0071cb144c7a 1097 else if( ret == MBEDTLS_ERR_PEM_PASSWORD_MISMATCH )
JMF 12:0071cb144c7a 1098 return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
JMF 12:0071cb144c7a 1099 else if( ret == MBEDTLS_ERR_PEM_PASSWORD_REQUIRED )
JMF 12:0071cb144c7a 1100 return( MBEDTLS_ERR_PK_PASSWORD_REQUIRED );
JMF 12:0071cb144c7a 1101 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
JMF 12:0071cb144c7a 1102 return( ret );
JMF 12:0071cb144c7a 1103 #endif /* MBEDTLS_RSA_C */
JMF 12:0071cb144c7a 1104
JMF 12:0071cb144c7a 1105 #if defined(MBEDTLS_ECP_C)
JMF 12:0071cb144c7a 1106 /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
JMF 12:0071cb144c7a 1107 if( keylen == 0 || key[keylen - 1] != '\0' )
JMF 12:0071cb144c7a 1108 ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
JMF 12:0071cb144c7a 1109 else
JMF 12:0071cb144c7a 1110 ret = mbedtls_pem_read_buffer( &pem,
JMF 12:0071cb144c7a 1111 "-----BEGIN EC PRIVATE KEY-----",
JMF 12:0071cb144c7a 1112 "-----END EC PRIVATE KEY-----",
JMF 12:0071cb144c7a 1113 key, pwd, pwdlen, &len );
JMF 12:0071cb144c7a 1114 if( ret == 0 )
JMF 12:0071cb144c7a 1115 {
JMF 12:0071cb144c7a 1116 if( ( pk_info = mbedtls_pk_info_from_type( MBEDTLS_PK_ECKEY ) ) == NULL )
JMF 12:0071cb144c7a 1117 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
JMF 12:0071cb144c7a 1118
JMF 12:0071cb144c7a 1119 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 ||
JMF 12:0071cb144c7a 1120 ( ret = pk_parse_key_sec1_der( mbedtls_pk_ec( *pk ),
JMF 12:0071cb144c7a 1121 pem.buf, pem.buflen ) ) != 0 )
JMF 12:0071cb144c7a 1122 {
JMF 12:0071cb144c7a 1123 mbedtls_pk_free( pk );
JMF 12:0071cb144c7a 1124 }
JMF 12:0071cb144c7a 1125
JMF 12:0071cb144c7a 1126 mbedtls_pem_free( &pem );
JMF 12:0071cb144c7a 1127 return( ret );
JMF 12:0071cb144c7a 1128 }
JMF 12:0071cb144c7a 1129 else if( ret == MBEDTLS_ERR_PEM_PASSWORD_MISMATCH )
JMF 12:0071cb144c7a 1130 return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
JMF 12:0071cb144c7a 1131 else if( ret == MBEDTLS_ERR_PEM_PASSWORD_REQUIRED )
JMF 12:0071cb144c7a 1132 return( MBEDTLS_ERR_PK_PASSWORD_REQUIRED );
JMF 12:0071cb144c7a 1133 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
JMF 12:0071cb144c7a 1134 return( ret );
JMF 12:0071cb144c7a 1135 #endif /* MBEDTLS_ECP_C */
JMF 12:0071cb144c7a 1136
JMF 12:0071cb144c7a 1137 /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
JMF 12:0071cb144c7a 1138 if( keylen == 0 || key[keylen - 1] != '\0' )
JMF 12:0071cb144c7a 1139 ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
JMF 12:0071cb144c7a 1140 else
JMF 12:0071cb144c7a 1141 ret = mbedtls_pem_read_buffer( &pem,
JMF 12:0071cb144c7a 1142 "-----BEGIN PRIVATE KEY-----",
JMF 12:0071cb144c7a 1143 "-----END PRIVATE KEY-----",
JMF 12:0071cb144c7a 1144 key, NULL, 0, &len );
JMF 12:0071cb144c7a 1145 if( ret == 0 )
JMF 12:0071cb144c7a 1146 {
JMF 12:0071cb144c7a 1147 if( ( ret = pk_parse_key_pkcs8_unencrypted_der( pk,
JMF 12:0071cb144c7a 1148 pem.buf, pem.buflen ) ) != 0 )
JMF 12:0071cb144c7a 1149 {
JMF 12:0071cb144c7a 1150 mbedtls_pk_free( pk );
JMF 12:0071cb144c7a 1151 }
JMF 12:0071cb144c7a 1152
JMF 12:0071cb144c7a 1153 mbedtls_pem_free( &pem );
JMF 12:0071cb144c7a 1154 return( ret );
JMF 12:0071cb144c7a 1155 }
JMF 12:0071cb144c7a 1156 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
JMF 12:0071cb144c7a 1157 return( ret );
JMF 12:0071cb144c7a 1158
JMF 12:0071cb144c7a 1159 #if defined(MBEDTLS_PKCS12_C) || defined(MBEDTLS_PKCS5_C)
JMF 12:0071cb144c7a 1160 /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
JMF 12:0071cb144c7a 1161 if( keylen == 0 || key[keylen - 1] != '\0' )
JMF 12:0071cb144c7a 1162 ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
JMF 12:0071cb144c7a 1163 else
JMF 12:0071cb144c7a 1164 ret = mbedtls_pem_read_buffer( &pem,
JMF 12:0071cb144c7a 1165 "-----BEGIN ENCRYPTED PRIVATE KEY-----",
JMF 12:0071cb144c7a 1166 "-----END ENCRYPTED PRIVATE KEY-----",
JMF 12:0071cb144c7a 1167 key, NULL, 0, &len );
JMF 12:0071cb144c7a 1168 if( ret == 0 )
JMF 12:0071cb144c7a 1169 {
JMF 12:0071cb144c7a 1170 if( ( ret = pk_parse_key_pkcs8_encrypted_der( pk,
JMF 12:0071cb144c7a 1171 pem.buf, pem.buflen,
JMF 12:0071cb144c7a 1172 pwd, pwdlen ) ) != 0 )
JMF 12:0071cb144c7a 1173 {
JMF 12:0071cb144c7a 1174 mbedtls_pk_free( pk );
JMF 12:0071cb144c7a 1175 }
JMF 12:0071cb144c7a 1176
JMF 12:0071cb144c7a 1177 mbedtls_pem_free( &pem );
JMF 12:0071cb144c7a 1178 return( ret );
JMF 12:0071cb144c7a 1179 }
JMF 12:0071cb144c7a 1180 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
JMF 12:0071cb144c7a 1181 return( ret );
JMF 12:0071cb144c7a 1182 #endif /* MBEDTLS_PKCS12_C || MBEDTLS_PKCS5_C */
JMF 12:0071cb144c7a 1183 #else
JMF 12:0071cb144c7a 1184 ((void) ret);
JMF 12:0071cb144c7a 1185 ((void) pwd);
JMF 12:0071cb144c7a 1186 ((void) pwdlen);
JMF 12:0071cb144c7a 1187 #endif /* MBEDTLS_PEM_PARSE_C */
JMF 12:0071cb144c7a 1188
JMF 12:0071cb144c7a 1189 /*
JMF 12:0071cb144c7a 1190 * At this point we only know it's not a PEM formatted key. Could be any
JMF 12:0071cb144c7a 1191 * of the known DER encoded private key formats
JMF 12:0071cb144c7a 1192 *
JMF 12:0071cb144c7a 1193 * We try the different DER format parsers to see if one passes without
JMF 12:0071cb144c7a 1194 * error
JMF 12:0071cb144c7a 1195 */
JMF 12:0071cb144c7a 1196 #if defined(MBEDTLS_PKCS12_C) || defined(MBEDTLS_PKCS5_C)
JMF 12:0071cb144c7a 1197 if( ( ret = pk_parse_key_pkcs8_encrypted_der( pk, key, keylen,
JMF 12:0071cb144c7a 1198 pwd, pwdlen ) ) == 0 )
JMF 12:0071cb144c7a 1199 {
JMF 12:0071cb144c7a 1200 return( 0 );
JMF 12:0071cb144c7a 1201 }
JMF 12:0071cb144c7a 1202
JMF 12:0071cb144c7a 1203 mbedtls_pk_free( pk );
JMF 12:0071cb144c7a 1204
JMF 12:0071cb144c7a 1205 if( ret == MBEDTLS_ERR_PK_PASSWORD_MISMATCH )
JMF 12:0071cb144c7a 1206 {
JMF 12:0071cb144c7a 1207 return( ret );
JMF 12:0071cb144c7a 1208 }
JMF 12:0071cb144c7a 1209 #endif /* MBEDTLS_PKCS12_C || MBEDTLS_PKCS5_C */
JMF 12:0071cb144c7a 1210
JMF 12:0071cb144c7a 1211 if( ( ret = pk_parse_key_pkcs8_unencrypted_der( pk, key, keylen ) ) == 0 )
JMF 12:0071cb144c7a 1212 return( 0 );
JMF 12:0071cb144c7a 1213
JMF 12:0071cb144c7a 1214 mbedtls_pk_free( pk );
JMF 12:0071cb144c7a 1215
JMF 12:0071cb144c7a 1216 #if defined(MBEDTLS_RSA_C)
JMF 12:0071cb144c7a 1217 if( ( pk_info = mbedtls_pk_info_from_type( MBEDTLS_PK_RSA ) ) == NULL )
JMF 12:0071cb144c7a 1218 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
JMF 12:0071cb144c7a 1219
JMF 12:0071cb144c7a 1220 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 ||
JMF 12:0071cb144c7a 1221 ( ret = pk_parse_key_pkcs1_der( mbedtls_pk_rsa( *pk ), key, keylen ) ) == 0 )
JMF 12:0071cb144c7a 1222 {
JMF 12:0071cb144c7a 1223 return( 0 );
JMF 12:0071cb144c7a 1224 }
JMF 12:0071cb144c7a 1225
JMF 12:0071cb144c7a 1226 mbedtls_pk_free( pk );
JMF 12:0071cb144c7a 1227 #endif /* MBEDTLS_RSA_C */
JMF 12:0071cb144c7a 1228
JMF 12:0071cb144c7a 1229 #if defined(MBEDTLS_ECP_C)
JMF 12:0071cb144c7a 1230 if( ( pk_info = mbedtls_pk_info_from_type( MBEDTLS_PK_ECKEY ) ) == NULL )
JMF 12:0071cb144c7a 1231 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
JMF 12:0071cb144c7a 1232
JMF 12:0071cb144c7a 1233 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 ||
JMF 12:0071cb144c7a 1234 ( ret = pk_parse_key_sec1_der( mbedtls_pk_ec( *pk ), key, keylen ) ) == 0 )
JMF 12:0071cb144c7a 1235 {
JMF 12:0071cb144c7a 1236 return( 0 );
JMF 12:0071cb144c7a 1237 }
JMF 12:0071cb144c7a 1238
JMF 12:0071cb144c7a 1239 mbedtls_pk_free( pk );
JMF 12:0071cb144c7a 1240 #endif /* MBEDTLS_ECP_C */
JMF 12:0071cb144c7a 1241
JMF 12:0071cb144c7a 1242 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
JMF 12:0071cb144c7a 1243 }
JMF 12:0071cb144c7a 1244
JMF 12:0071cb144c7a 1245 /*
JMF 12:0071cb144c7a 1246 * Parse a public key
JMF 12:0071cb144c7a 1247 */
JMF 12:0071cb144c7a 1248 int mbedtls_pk_parse_public_key( mbedtls_pk_context *ctx,
JMF 12:0071cb144c7a 1249 const unsigned char *key, size_t keylen )
JMF 12:0071cb144c7a 1250 {
JMF 12:0071cb144c7a 1251 int ret;
JMF 12:0071cb144c7a 1252 unsigned char *p;
JMF 12:0071cb144c7a 1253 #if defined(MBEDTLS_PEM_PARSE_C)
JMF 12:0071cb144c7a 1254 size_t len;
JMF 12:0071cb144c7a 1255 mbedtls_pem_context pem;
JMF 12:0071cb144c7a 1256
JMF 12:0071cb144c7a 1257 mbedtls_pem_init( &pem );
JMF 12:0071cb144c7a 1258
JMF 12:0071cb144c7a 1259 /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
JMF 12:0071cb144c7a 1260 if( keylen == 0 || key[keylen - 1] != '\0' )
JMF 12:0071cb144c7a 1261 ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
JMF 12:0071cb144c7a 1262 else
JMF 12:0071cb144c7a 1263 ret = mbedtls_pem_read_buffer( &pem,
JMF 12:0071cb144c7a 1264 "-----BEGIN PUBLIC KEY-----",
JMF 12:0071cb144c7a 1265 "-----END PUBLIC KEY-----",
JMF 12:0071cb144c7a 1266 key, NULL, 0, &len );
JMF 12:0071cb144c7a 1267
JMF 12:0071cb144c7a 1268 if( ret == 0 )
JMF 12:0071cb144c7a 1269 {
JMF 12:0071cb144c7a 1270 /*
JMF 12:0071cb144c7a 1271 * Was PEM encoded
JMF 12:0071cb144c7a 1272 */
JMF 12:0071cb144c7a 1273 key = pem.buf;
JMF 12:0071cb144c7a 1274 keylen = pem.buflen;
JMF 12:0071cb144c7a 1275 }
JMF 12:0071cb144c7a 1276 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
JMF 12:0071cb144c7a 1277 {
JMF 12:0071cb144c7a 1278 mbedtls_pem_free( &pem );
JMF 12:0071cb144c7a 1279 return( ret );
JMF 12:0071cb144c7a 1280 }
JMF 12:0071cb144c7a 1281 #endif /* MBEDTLS_PEM_PARSE_C */
JMF 12:0071cb144c7a 1282 p = (unsigned char *) key;
JMF 12:0071cb144c7a 1283
JMF 12:0071cb144c7a 1284 ret = mbedtls_pk_parse_subpubkey( &p, p + keylen, ctx );
JMF 12:0071cb144c7a 1285
JMF 12:0071cb144c7a 1286 #if defined(MBEDTLS_PEM_PARSE_C)
JMF 12:0071cb144c7a 1287 mbedtls_pem_free( &pem );
JMF 12:0071cb144c7a 1288 #endif
JMF 12:0071cb144c7a 1289
JMF 12:0071cb144c7a 1290 return( ret );
JMF 12:0071cb144c7a 1291 }
JMF 12:0071cb144c7a 1292
JMF 12:0071cb144c7a 1293 #endif /* MBEDTLS_PK_PARSE_C */