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mbed-os/features/mbedtls/src/pkparse.c@0:02dd72d1d465, 2018-04-24 (annotated)

Committer:
borlanic
Date:
Tue Apr 24 11:45:18 2018 +0000
Revision:
0:02dd72d1d465
BaBoRo_test2 - backup 1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
borlanic 0:02dd72d1d465 1 /*
borlanic 0:02dd72d1d465 2 * Public Key layer for parsing key files and structures
borlanic 0:02dd72d1d465 3 *
borlanic 0:02dd72d1d465 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
borlanic 0:02dd72d1d465 5 * SPDX-License-Identifier: Apache-2.0
borlanic 0:02dd72d1d465 6 *
borlanic 0:02dd72d1d465 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
borlanic 0:02dd72d1d465 8 * not use this file except in compliance with the License.
borlanic 0:02dd72d1d465 9 * You may obtain a copy of the License at
borlanic 0:02dd72d1d465 10 *
borlanic 0:02dd72d1d465 11 * http://www.apache.org/licenses/LICENSE-2.0
borlanic 0:02dd72d1d465 12 *
borlanic 0:02dd72d1d465 13 * Unless required by applicable law or agreed to in writing, software
borlanic 0:02dd72d1d465 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
borlanic 0:02dd72d1d465 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
borlanic 0:02dd72d1d465 16 * See the License for the specific language governing permissions and
borlanic 0:02dd72d1d465 17 * limitations under the License.
borlanic 0:02dd72d1d465 18 *
borlanic 0:02dd72d1d465 19 * This file is part of mbed TLS (https://tls.mbed.org)
borlanic 0:02dd72d1d465 20 */
borlanic 0:02dd72d1d465 21
borlanic 0:02dd72d1d465 22 #if !defined(MBEDTLS_CONFIG_FILE)
borlanic 0:02dd72d1d465 23 #include "mbedtls/config.h"
borlanic 0:02dd72d1d465 24 #else
borlanic 0:02dd72d1d465 25 #include MBEDTLS_CONFIG_FILE
borlanic 0:02dd72d1d465 26 #endif
borlanic 0:02dd72d1d465 27
borlanic 0:02dd72d1d465 28 #if defined(MBEDTLS_PK_PARSE_C)
borlanic 0:02dd72d1d465 29
borlanic 0:02dd72d1d465 30 #include "mbedtls/pk.h"
borlanic 0:02dd72d1d465 31 #include "mbedtls/asn1.h"
borlanic 0:02dd72d1d465 32 #include "mbedtls/oid.h"
borlanic 0:02dd72d1d465 33
borlanic 0:02dd72d1d465 34 #include <string.h>
borlanic 0:02dd72d1d465 35
borlanic 0:02dd72d1d465 36 #if defined(MBEDTLS_RSA_C)
borlanic 0:02dd72d1d465 37 #include "mbedtls/rsa.h"
borlanic 0:02dd72d1d465 38 #endif
borlanic 0:02dd72d1d465 39 #if defined(MBEDTLS_ECP_C)
borlanic 0:02dd72d1d465 40 #include "mbedtls/ecp.h"
borlanic 0:02dd72d1d465 41 #endif
borlanic 0:02dd72d1d465 42 #if defined(MBEDTLS_ECDSA_C)
borlanic 0:02dd72d1d465 43 #include "mbedtls/ecdsa.h"
borlanic 0:02dd72d1d465 44 #endif
borlanic 0:02dd72d1d465 45 #if defined(MBEDTLS_PEM_PARSE_C)
borlanic 0:02dd72d1d465 46 #include "mbedtls/pem.h"
borlanic 0:02dd72d1d465 47 #endif
borlanic 0:02dd72d1d465 48 #if defined(MBEDTLS_PKCS5_C)
borlanic 0:02dd72d1d465 49 #include "mbedtls/pkcs5.h"
borlanic 0:02dd72d1d465 50 #endif
borlanic 0:02dd72d1d465 51 #if defined(MBEDTLS_PKCS12_C)
borlanic 0:02dd72d1d465 52 #include "mbedtls/pkcs12.h"
borlanic 0:02dd72d1d465 53 #endif
borlanic 0:02dd72d1d465 54
borlanic 0:02dd72d1d465 55 #if defined(MBEDTLS_PLATFORM_C)
borlanic 0:02dd72d1d465 56 #include "mbedtls/platform.h"
borlanic 0:02dd72d1d465 57 #else
borlanic 0:02dd72d1d465 58 #include <stdlib.h>
borlanic 0:02dd72d1d465 59 #define mbedtls_calloc calloc
borlanic 0:02dd72d1d465 60 #define mbedtls_free free
borlanic 0:02dd72d1d465 61 #endif
borlanic 0:02dd72d1d465 62
borlanic 0:02dd72d1d465 63 #if defined(MBEDTLS_FS_IO) || \
borlanic 0:02dd72d1d465 64 defined(MBEDTLS_PKCS12_C) || defined(MBEDTLS_PKCS5_C)
borlanic 0:02dd72d1d465 65 /* Implementation that should never be optimized out by the compiler */
borlanic 0:02dd72d1d465 66 static void mbedtls_zeroize( void *v, size_t n ) {
borlanic 0:02dd72d1d465 67 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
borlanic 0:02dd72d1d465 68 }
borlanic 0:02dd72d1d465 69 #endif
borlanic 0:02dd72d1d465 70
borlanic 0:02dd72d1d465 71 #if defined(MBEDTLS_FS_IO)
borlanic 0:02dd72d1d465 72 /*
borlanic 0:02dd72d1d465 73 * Load all data from a file into a given buffer.
borlanic 0:02dd72d1d465 74 *
borlanic 0:02dd72d1d465 75 * The file is expected to contain either PEM or DER encoded data.
borlanic 0:02dd72d1d465 76 * A terminating null byte is always appended. It is included in the announced
borlanic 0:02dd72d1d465 77 * length only if the data looks like it is PEM encoded.
borlanic 0:02dd72d1d465 78 */
borlanic 0:02dd72d1d465 79 int mbedtls_pk_load_file( const char *path, unsigned char **buf, size_t *n )
borlanic 0:02dd72d1d465 80 {
borlanic 0:02dd72d1d465 81 FILE *f;
borlanic 0:02dd72d1d465 82 long size;
borlanic 0:02dd72d1d465 83
borlanic 0:02dd72d1d465 84 if( ( f = fopen( path, "rb" ) ) == NULL )
borlanic 0:02dd72d1d465 85 return( MBEDTLS_ERR_PK_FILE_IO_ERROR );
borlanic 0:02dd72d1d465 86
borlanic 0:02dd72d1d465 87 fseek( f, 0, SEEK_END );
borlanic 0:02dd72d1d465 88 if( ( size = ftell( f ) ) == -1 )
borlanic 0:02dd72d1d465 89 {
borlanic 0:02dd72d1d465 90 fclose( f );
borlanic 0:02dd72d1d465 91 return( MBEDTLS_ERR_PK_FILE_IO_ERROR );
borlanic 0:02dd72d1d465 92 }
borlanic 0:02dd72d1d465 93 fseek( f, 0, SEEK_SET );
borlanic 0:02dd72d1d465 94
borlanic 0:02dd72d1d465 95 *n = (size_t) size;
borlanic 0:02dd72d1d465 96
borlanic 0:02dd72d1d465 97 if( *n + 1 == 0 ||
borlanic 0:02dd72d1d465 98 ( *buf = mbedtls_calloc( 1, *n + 1 ) ) == NULL )
borlanic 0:02dd72d1d465 99 {
borlanic 0:02dd72d1d465 100 fclose( f );
borlanic 0:02dd72d1d465 101 return( MBEDTLS_ERR_PK_ALLOC_FAILED );
borlanic 0:02dd72d1d465 102 }
borlanic 0:02dd72d1d465 103
borlanic 0:02dd72d1d465 104 if( fread( *buf, 1, *n, f ) != *n )
borlanic 0:02dd72d1d465 105 {
borlanic 0:02dd72d1d465 106 fclose( f );
borlanic 0:02dd72d1d465 107
borlanic 0:02dd72d1d465 108 mbedtls_zeroize( *buf, *n );
borlanic 0:02dd72d1d465 109 mbedtls_free( *buf );
borlanic 0:02dd72d1d465 110
borlanic 0:02dd72d1d465 111 return( MBEDTLS_ERR_PK_FILE_IO_ERROR );
borlanic 0:02dd72d1d465 112 }
borlanic 0:02dd72d1d465 113
borlanic 0:02dd72d1d465 114 fclose( f );
borlanic 0:02dd72d1d465 115
borlanic 0:02dd72d1d465 116 (*buf)[*n] = '\0';
borlanic 0:02dd72d1d465 117
borlanic 0:02dd72d1d465 118 if( strstr( (const char *) *buf, "-----BEGIN " ) != NULL )
borlanic 0:02dd72d1d465 119 ++*n;
borlanic 0:02dd72d1d465 120
borlanic 0:02dd72d1d465 121 return( 0 );
borlanic 0:02dd72d1d465 122 }
borlanic 0:02dd72d1d465 123
borlanic 0:02dd72d1d465 124 /*
borlanic 0:02dd72d1d465 125 * Load and parse a private key
borlanic 0:02dd72d1d465 126 */
borlanic 0:02dd72d1d465 127 int mbedtls_pk_parse_keyfile( mbedtls_pk_context *ctx,
borlanic 0:02dd72d1d465 128 const char *path, const char *pwd )
borlanic 0:02dd72d1d465 129 {
borlanic 0:02dd72d1d465 130 int ret;
borlanic 0:02dd72d1d465 131 size_t n;
borlanic 0:02dd72d1d465 132 unsigned char *buf;
borlanic 0:02dd72d1d465 133
borlanic 0:02dd72d1d465 134 if( ( ret = mbedtls_pk_load_file( path, &buf, &n ) ) != 0 )
borlanic 0:02dd72d1d465 135 return( ret );
borlanic 0:02dd72d1d465 136
borlanic 0:02dd72d1d465 137 if( pwd == NULL )
borlanic 0:02dd72d1d465 138 ret = mbedtls_pk_parse_key( ctx, buf, n, NULL, 0 );
borlanic 0:02dd72d1d465 139 else
borlanic 0:02dd72d1d465 140 ret = mbedtls_pk_parse_key( ctx, buf, n,
borlanic 0:02dd72d1d465 141 (const unsigned char *) pwd, strlen( pwd ) );
borlanic 0:02dd72d1d465 142
borlanic 0:02dd72d1d465 143 mbedtls_zeroize( buf, n );
borlanic 0:02dd72d1d465 144 mbedtls_free( buf );
borlanic 0:02dd72d1d465 145
borlanic 0:02dd72d1d465 146 return( ret );
borlanic 0:02dd72d1d465 147 }
borlanic 0:02dd72d1d465 148
borlanic 0:02dd72d1d465 149 /*
borlanic 0:02dd72d1d465 150 * Load and parse a public key
borlanic 0:02dd72d1d465 151 */
borlanic 0:02dd72d1d465 152 int mbedtls_pk_parse_public_keyfile( mbedtls_pk_context *ctx, const char *path )
borlanic 0:02dd72d1d465 153 {
borlanic 0:02dd72d1d465 154 int ret;
borlanic 0:02dd72d1d465 155 size_t n;
borlanic 0:02dd72d1d465 156 unsigned char *buf;
borlanic 0:02dd72d1d465 157
borlanic 0:02dd72d1d465 158 if( ( ret = mbedtls_pk_load_file( path, &buf, &n ) ) != 0 )
borlanic 0:02dd72d1d465 159 return( ret );
borlanic 0:02dd72d1d465 160
borlanic 0:02dd72d1d465 161 ret = mbedtls_pk_parse_public_key( ctx, buf, n );
borlanic 0:02dd72d1d465 162
borlanic 0:02dd72d1d465 163 mbedtls_zeroize( buf, n );
borlanic 0:02dd72d1d465 164 mbedtls_free( buf );
borlanic 0:02dd72d1d465 165
borlanic 0:02dd72d1d465 166 return( ret );
borlanic 0:02dd72d1d465 167 }
borlanic 0:02dd72d1d465 168 #endif /* MBEDTLS_FS_IO */
borlanic 0:02dd72d1d465 169
borlanic 0:02dd72d1d465 170 #if defined(MBEDTLS_ECP_C)
borlanic 0:02dd72d1d465 171 /* Minimally parse an ECParameters buffer to and mbedtls_asn1_buf
borlanic 0:02dd72d1d465 172 *
borlanic 0:02dd72d1d465 173 * ECParameters ::= CHOICE {
borlanic 0:02dd72d1d465 174 * namedCurve OBJECT IDENTIFIER
borlanic 0:02dd72d1d465 175 * specifiedCurve SpecifiedECDomain -- = SEQUENCE { ... }
borlanic 0:02dd72d1d465 176 * -- implicitCurve NULL
borlanic 0:02dd72d1d465 177 * }
borlanic 0:02dd72d1d465 178 */
borlanic 0:02dd72d1d465 179 static int pk_get_ecparams( unsigned char **p, const unsigned char *end,
borlanic 0:02dd72d1d465 180 mbedtls_asn1_buf *params )
borlanic 0:02dd72d1d465 181 {
borlanic 0:02dd72d1d465 182 int ret;
borlanic 0:02dd72d1d465 183
borlanic 0:02dd72d1d465 184 /* Tag may be either OID or SEQUENCE */
borlanic 0:02dd72d1d465 185 params->tag = **p;
borlanic 0:02dd72d1d465 186 if( params->tag != MBEDTLS_ASN1_OID
borlanic 0:02dd72d1d465 187 #if defined(MBEDTLS_PK_PARSE_EC_EXTENDED)
borlanic 0:02dd72d1d465 188 && params->tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE )
borlanic 0:02dd72d1d465 189 #endif
borlanic 0:02dd72d1d465 190 )
borlanic 0:02dd72d1d465 191 {
borlanic 0:02dd72d1d465 192 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
borlanic 0:02dd72d1d465 193 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
borlanic 0:02dd72d1d465 194 }
borlanic 0:02dd72d1d465 195
borlanic 0:02dd72d1d465 196 if( ( ret = mbedtls_asn1_get_tag( p, end, &params->len, params->tag ) ) != 0 )
borlanic 0:02dd72d1d465 197 {
borlanic 0:02dd72d1d465 198 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
borlanic 0:02dd72d1d465 199 }
borlanic 0:02dd72d1d465 200
borlanic 0:02dd72d1d465 201 params->p = *p;
borlanic 0:02dd72d1d465 202 *p += params->len;
borlanic 0:02dd72d1d465 203
borlanic 0:02dd72d1d465 204 if( *p != end )
borlanic 0:02dd72d1d465 205 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
borlanic 0:02dd72d1d465 206 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
borlanic 0:02dd72d1d465 207
borlanic 0:02dd72d1d465 208 return( 0 );
borlanic 0:02dd72d1d465 209 }
borlanic 0:02dd72d1d465 210
borlanic 0:02dd72d1d465 211 #if defined(MBEDTLS_PK_PARSE_EC_EXTENDED)
borlanic 0:02dd72d1d465 212 /*
borlanic 0:02dd72d1d465 213 * Parse a SpecifiedECDomain (SEC 1 C.2) and (mostly) fill the group with it.
borlanic 0:02dd72d1d465 214 * WARNING: the resulting group should only be used with
borlanic 0:02dd72d1d465 215 * pk_group_id_from_specified(), since its base point may not be set correctly
borlanic 0:02dd72d1d465 216 * if it was encoded compressed.
borlanic 0:02dd72d1d465 217 *
borlanic 0:02dd72d1d465 218 * SpecifiedECDomain ::= SEQUENCE {
borlanic 0:02dd72d1d465 219 * version SpecifiedECDomainVersion(ecdpVer1 | ecdpVer2 | ecdpVer3, ...),
borlanic 0:02dd72d1d465 220 * fieldID FieldID {{FieldTypes}},
borlanic 0:02dd72d1d465 221 * curve Curve,
borlanic 0:02dd72d1d465 222 * base ECPoint,
borlanic 0:02dd72d1d465 223 * order INTEGER,
borlanic 0:02dd72d1d465 224 * cofactor INTEGER OPTIONAL,
borlanic 0:02dd72d1d465 225 * hash HashAlgorithm OPTIONAL,
borlanic 0:02dd72d1d465 226 * ...
borlanic 0:02dd72d1d465 227 * }
borlanic 0:02dd72d1d465 228 *
borlanic 0:02dd72d1d465 229 * We only support prime-field as field type, and ignore hash and cofactor.
borlanic 0:02dd72d1d465 230 */
borlanic 0:02dd72d1d465 231 static int pk_group_from_specified( const mbedtls_asn1_buf *params, mbedtls_ecp_group *grp )
borlanic 0:02dd72d1d465 232 {
borlanic 0:02dd72d1d465 233 int ret;
borlanic 0:02dd72d1d465 234 unsigned char *p = params->p;
borlanic 0:02dd72d1d465 235 const unsigned char * const end = params->p + params->len;
borlanic 0:02dd72d1d465 236 const unsigned char *end_field, *end_curve;
borlanic 0:02dd72d1d465 237 size_t len;
borlanic 0:02dd72d1d465 238 int ver;
borlanic 0:02dd72d1d465 239
borlanic 0:02dd72d1d465 240 /* SpecifiedECDomainVersion ::= INTEGER { 1, 2, 3 } */
borlanic 0:02dd72d1d465 241 if( ( ret = mbedtls_asn1_get_int( &p, end, &ver ) ) != 0 )
borlanic 0:02dd72d1d465 242 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
borlanic 0:02dd72d1d465 243
borlanic 0:02dd72d1d465 244 if( ver < 1 || ver > 3 )
borlanic 0:02dd72d1d465 245 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
borlanic 0:02dd72d1d465 246
borlanic 0:02dd72d1d465 247 /*
borlanic 0:02dd72d1d465 248 * FieldID { FIELD-ID:IOSet } ::= SEQUENCE { -- Finite field
borlanic 0:02dd72d1d465 249 * fieldType FIELD-ID.&id({IOSet}),
borlanic 0:02dd72d1d465 250 * parameters FIELD-ID.&Type({IOSet}{@fieldType})
borlanic 0:02dd72d1d465 251 * }
borlanic 0:02dd72d1d465 252 */
borlanic 0:02dd72d1d465 253 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
borlanic 0:02dd72d1d465 254 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
borlanic 0:02dd72d1d465 255 return( ret );
borlanic 0:02dd72d1d465 256
borlanic 0:02dd72d1d465 257 end_field = p + len;
borlanic 0:02dd72d1d465 258
borlanic 0:02dd72d1d465 259 /*
borlanic 0:02dd72d1d465 260 * FIELD-ID ::= TYPE-IDENTIFIER
borlanic 0:02dd72d1d465 261 * FieldTypes FIELD-ID ::= {
borlanic 0:02dd72d1d465 262 * { Prime-p IDENTIFIED BY prime-field } |
borlanic 0:02dd72d1d465 263 * { Characteristic-two IDENTIFIED BY characteristic-two-field }
borlanic 0:02dd72d1d465 264 * }
borlanic 0:02dd72d1d465 265 * prime-field OBJECT IDENTIFIER ::= { id-fieldType 1 }
borlanic 0:02dd72d1d465 266 */
borlanic 0:02dd72d1d465 267 if( ( ret = mbedtls_asn1_get_tag( &p, end_field, &len, MBEDTLS_ASN1_OID ) ) != 0 )
borlanic 0:02dd72d1d465 268 return( ret );
borlanic 0:02dd72d1d465 269
borlanic 0:02dd72d1d465 270 if( len != MBEDTLS_OID_SIZE( MBEDTLS_OID_ANSI_X9_62_PRIME_FIELD ) ||
borlanic 0:02dd72d1d465 271 memcmp( p, MBEDTLS_OID_ANSI_X9_62_PRIME_FIELD, len ) != 0 )
borlanic 0:02dd72d1d465 272 {
borlanic 0:02dd72d1d465 273 return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
borlanic 0:02dd72d1d465 274 }
borlanic 0:02dd72d1d465 275
borlanic 0:02dd72d1d465 276 p += len;
borlanic 0:02dd72d1d465 277
borlanic 0:02dd72d1d465 278 /* Prime-p ::= INTEGER -- Field of size p. */
borlanic 0:02dd72d1d465 279 if( ( ret = mbedtls_asn1_get_mpi( &p, end_field, &grp->P ) ) != 0 )
borlanic 0:02dd72d1d465 280 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
borlanic 0:02dd72d1d465 281
borlanic 0:02dd72d1d465 282 grp->pbits = mbedtls_mpi_bitlen( &grp->P );
borlanic 0:02dd72d1d465 283
borlanic 0:02dd72d1d465 284 if( p != end_field )
borlanic 0:02dd72d1d465 285 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
borlanic 0:02dd72d1d465 286 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
borlanic 0:02dd72d1d465 287
borlanic 0:02dd72d1d465 288 /*
borlanic 0:02dd72d1d465 289 * Curve ::= SEQUENCE {
borlanic 0:02dd72d1d465 290 * a FieldElement,
borlanic 0:02dd72d1d465 291 * b FieldElement,
borlanic 0:02dd72d1d465 292 * seed BIT STRING OPTIONAL
borlanic 0:02dd72d1d465 293 * -- Shall be present if used in SpecifiedECDomain
borlanic 0:02dd72d1d465 294 * -- with version equal to ecdpVer2 or ecdpVer3
borlanic 0:02dd72d1d465 295 * }
borlanic 0:02dd72d1d465 296 */
borlanic 0:02dd72d1d465 297 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
borlanic 0:02dd72d1d465 298 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
borlanic 0:02dd72d1d465 299 return( ret );
borlanic 0:02dd72d1d465 300
borlanic 0:02dd72d1d465 301 end_curve = p + len;
borlanic 0:02dd72d1d465 302
borlanic 0:02dd72d1d465 303 /*
borlanic 0:02dd72d1d465 304 * FieldElement ::= OCTET STRING
borlanic 0:02dd72d1d465 305 * containing an integer in the case of a prime field
borlanic 0:02dd72d1d465 306 */
borlanic 0:02dd72d1d465 307 if( ( ret = mbedtls_asn1_get_tag( &p, end_curve, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 ||
borlanic 0:02dd72d1d465 308 ( ret = mbedtls_mpi_read_binary( &grp->A, p, len ) ) != 0 )
borlanic 0:02dd72d1d465 309 {
borlanic 0:02dd72d1d465 310 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
borlanic 0:02dd72d1d465 311 }
borlanic 0:02dd72d1d465 312
borlanic 0:02dd72d1d465 313 p += len;
borlanic 0:02dd72d1d465 314
borlanic 0:02dd72d1d465 315 if( ( ret = mbedtls_asn1_get_tag( &p, end_curve, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 ||
borlanic 0:02dd72d1d465 316 ( ret = mbedtls_mpi_read_binary( &grp->B, p, len ) ) != 0 )
borlanic 0:02dd72d1d465 317 {
borlanic 0:02dd72d1d465 318 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
borlanic 0:02dd72d1d465 319 }
borlanic 0:02dd72d1d465 320
borlanic 0:02dd72d1d465 321 p += len;
borlanic 0:02dd72d1d465 322
borlanic 0:02dd72d1d465 323 /* Ignore seed BIT STRING OPTIONAL */
borlanic 0:02dd72d1d465 324 if( ( ret = mbedtls_asn1_get_tag( &p, end_curve, &len, MBEDTLS_ASN1_BIT_STRING ) ) == 0 )
borlanic 0:02dd72d1d465 325 p += len;
borlanic 0:02dd72d1d465 326
borlanic 0:02dd72d1d465 327 if( p != end_curve )
borlanic 0:02dd72d1d465 328 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
borlanic 0:02dd72d1d465 329 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
borlanic 0:02dd72d1d465 330
borlanic 0:02dd72d1d465 331 /*
borlanic 0:02dd72d1d465 332 * ECPoint ::= OCTET STRING
borlanic 0:02dd72d1d465 333 */
borlanic 0:02dd72d1d465 334 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
borlanic 0:02dd72d1d465 335 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
borlanic 0:02dd72d1d465 336
borlanic 0:02dd72d1d465 337 if( ( ret = mbedtls_ecp_point_read_binary( grp, &grp->G,
borlanic 0:02dd72d1d465 338 ( const unsigned char *) p, len ) ) != 0 )
borlanic 0:02dd72d1d465 339 {
borlanic 0:02dd72d1d465 340 /*
borlanic 0:02dd72d1d465 341 * If we can't read the point because it's compressed, cheat by
borlanic 0:02dd72d1d465 342 * reading only the X coordinate and the parity bit of Y.
borlanic 0:02dd72d1d465 343 */
borlanic 0:02dd72d1d465 344 if( ret != MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE ||
borlanic 0:02dd72d1d465 345 ( p[0] != 0x02 && p[0] != 0x03 ) ||
borlanic 0:02dd72d1d465 346 len != mbedtls_mpi_size( &grp->P ) + 1 ||
borlanic 0:02dd72d1d465 347 mbedtls_mpi_read_binary( &grp->G.X, p + 1, len - 1 ) != 0 ||
borlanic 0:02dd72d1d465 348 mbedtls_mpi_lset( &grp->G.Y, p[0] - 2 ) != 0 ||
borlanic 0:02dd72d1d465 349 mbedtls_mpi_lset( &grp->G.Z, 1 ) != 0 )
borlanic 0:02dd72d1d465 350 {
borlanic 0:02dd72d1d465 351 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
borlanic 0:02dd72d1d465 352 }
borlanic 0:02dd72d1d465 353 }
borlanic 0:02dd72d1d465 354
borlanic 0:02dd72d1d465 355 p += len;
borlanic 0:02dd72d1d465 356
borlanic 0:02dd72d1d465 357 /*
borlanic 0:02dd72d1d465 358 * order INTEGER
borlanic 0:02dd72d1d465 359 */
borlanic 0:02dd72d1d465 360 if( ( ret = mbedtls_asn1_get_mpi( &p, end, &grp->N ) ) != 0 )
borlanic 0:02dd72d1d465 361 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
borlanic 0:02dd72d1d465 362
borlanic 0:02dd72d1d465 363 grp->nbits = mbedtls_mpi_bitlen( &grp->N );
borlanic 0:02dd72d1d465 364
borlanic 0:02dd72d1d465 365 /*
borlanic 0:02dd72d1d465 366 * Allow optional elements by purposefully not enforcing p == end here.
borlanic 0:02dd72d1d465 367 */
borlanic 0:02dd72d1d465 368
borlanic 0:02dd72d1d465 369 return( 0 );
borlanic 0:02dd72d1d465 370 }
borlanic 0:02dd72d1d465 371
borlanic 0:02dd72d1d465 372 /*
borlanic 0:02dd72d1d465 373 * Find the group id associated with an (almost filled) group as generated by
borlanic 0:02dd72d1d465 374 * pk_group_from_specified(), or return an error if unknown.
borlanic 0:02dd72d1d465 375 */
borlanic 0:02dd72d1d465 376 static int pk_group_id_from_group( const mbedtls_ecp_group *grp, mbedtls_ecp_group_id *grp_id )
borlanic 0:02dd72d1d465 377 {
borlanic 0:02dd72d1d465 378 int ret = 0;
borlanic 0:02dd72d1d465 379 mbedtls_ecp_group ref;
borlanic 0:02dd72d1d465 380 const mbedtls_ecp_group_id *id;
borlanic 0:02dd72d1d465 381
borlanic 0:02dd72d1d465 382 mbedtls_ecp_group_init( &ref );
borlanic 0:02dd72d1d465 383
borlanic 0:02dd72d1d465 384 for( id = mbedtls_ecp_grp_id_list(); *id != MBEDTLS_ECP_DP_NONE; id++ )
borlanic 0:02dd72d1d465 385 {
borlanic 0:02dd72d1d465 386 /* Load the group associated to that id */
borlanic 0:02dd72d1d465 387 mbedtls_ecp_group_free( &ref );
borlanic 0:02dd72d1d465 388 MBEDTLS_MPI_CHK( mbedtls_ecp_group_load( &ref, *id ) );
borlanic 0:02dd72d1d465 389
borlanic 0:02dd72d1d465 390 /* Compare to the group we were given, starting with easy tests */
borlanic 0:02dd72d1d465 391 if( grp->pbits == ref.pbits && grp->nbits == ref.nbits &&
borlanic 0:02dd72d1d465 392 mbedtls_mpi_cmp_mpi( &grp->P, &ref.P ) == 0 &&
borlanic 0:02dd72d1d465 393 mbedtls_mpi_cmp_mpi( &grp->A, &ref.A ) == 0 &&
borlanic 0:02dd72d1d465 394 mbedtls_mpi_cmp_mpi( &grp->B, &ref.B ) == 0 &&
borlanic 0:02dd72d1d465 395 mbedtls_mpi_cmp_mpi( &grp->N, &ref.N ) == 0 &&
borlanic 0:02dd72d1d465 396 mbedtls_mpi_cmp_mpi( &grp->G.X, &ref.G.X ) == 0 &&
borlanic 0:02dd72d1d465 397 mbedtls_mpi_cmp_mpi( &grp->G.Z, &ref.G.Z ) == 0 &&
borlanic 0:02dd72d1d465 398 /* For Y we may only know the parity bit, so compare only that */
borlanic 0:02dd72d1d465 399 mbedtls_mpi_get_bit( &grp->G.Y, 0 ) == mbedtls_mpi_get_bit( &ref.G.Y, 0 ) )
borlanic 0:02dd72d1d465 400 {
borlanic 0:02dd72d1d465 401 break;
borlanic 0:02dd72d1d465 402 }
borlanic 0:02dd72d1d465 403
borlanic 0:02dd72d1d465 404 }
borlanic 0:02dd72d1d465 405
borlanic 0:02dd72d1d465 406 cleanup:
borlanic 0:02dd72d1d465 407 mbedtls_ecp_group_free( &ref );
borlanic 0:02dd72d1d465 408
borlanic 0:02dd72d1d465 409 *grp_id = *id;
borlanic 0:02dd72d1d465 410
borlanic 0:02dd72d1d465 411 if( ret == 0 && *id == MBEDTLS_ECP_DP_NONE )
borlanic 0:02dd72d1d465 412 ret = MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE;
borlanic 0:02dd72d1d465 413
borlanic 0:02dd72d1d465 414 return( ret );
borlanic 0:02dd72d1d465 415 }
borlanic 0:02dd72d1d465 416
borlanic 0:02dd72d1d465 417 /*
borlanic 0:02dd72d1d465 418 * Parse a SpecifiedECDomain (SEC 1 C.2) and find the associated group ID
borlanic 0:02dd72d1d465 419 */
borlanic 0:02dd72d1d465 420 static int pk_group_id_from_specified( const mbedtls_asn1_buf *params,
borlanic 0:02dd72d1d465 421 mbedtls_ecp_group_id *grp_id )
borlanic 0:02dd72d1d465 422 {
borlanic 0:02dd72d1d465 423 int ret;
borlanic 0:02dd72d1d465 424 mbedtls_ecp_group grp;
borlanic 0:02dd72d1d465 425
borlanic 0:02dd72d1d465 426 mbedtls_ecp_group_init( &grp );
borlanic 0:02dd72d1d465 427
borlanic 0:02dd72d1d465 428 if( ( ret = pk_group_from_specified( params, &grp ) ) != 0 )
borlanic 0:02dd72d1d465 429 goto cleanup;
borlanic 0:02dd72d1d465 430
borlanic 0:02dd72d1d465 431 ret = pk_group_id_from_group( &grp, grp_id );
borlanic 0:02dd72d1d465 432
borlanic 0:02dd72d1d465 433 cleanup:
borlanic 0:02dd72d1d465 434 mbedtls_ecp_group_free( &grp );
borlanic 0:02dd72d1d465 435
borlanic 0:02dd72d1d465 436 return( ret );
borlanic 0:02dd72d1d465 437 }
borlanic 0:02dd72d1d465 438 #endif /* MBEDTLS_PK_PARSE_EC_EXTENDED */
borlanic 0:02dd72d1d465 439
borlanic 0:02dd72d1d465 440 /*
borlanic 0:02dd72d1d465 441 * Use EC parameters to initialise an EC group
borlanic 0:02dd72d1d465 442 *
borlanic 0:02dd72d1d465 443 * ECParameters ::= CHOICE {
borlanic 0:02dd72d1d465 444 * namedCurve OBJECT IDENTIFIER
borlanic 0:02dd72d1d465 445 * specifiedCurve SpecifiedECDomain -- = SEQUENCE { ... }
borlanic 0:02dd72d1d465 446 * -- implicitCurve NULL
borlanic 0:02dd72d1d465 447 */
borlanic 0:02dd72d1d465 448 static int pk_use_ecparams( const mbedtls_asn1_buf *params, mbedtls_ecp_group *grp )
borlanic 0:02dd72d1d465 449 {
borlanic 0:02dd72d1d465 450 int ret;
borlanic 0:02dd72d1d465 451 mbedtls_ecp_group_id grp_id;
borlanic 0:02dd72d1d465 452
borlanic 0:02dd72d1d465 453 if( params->tag == MBEDTLS_ASN1_OID )
borlanic 0:02dd72d1d465 454 {
borlanic 0:02dd72d1d465 455 if( mbedtls_oid_get_ec_grp( params, &grp_id ) != 0 )
borlanic 0:02dd72d1d465 456 return( MBEDTLS_ERR_PK_UNKNOWN_NAMED_CURVE );
borlanic 0:02dd72d1d465 457 }
borlanic 0:02dd72d1d465 458 else
borlanic 0:02dd72d1d465 459 {
borlanic 0:02dd72d1d465 460 #if defined(MBEDTLS_PK_PARSE_EC_EXTENDED)
borlanic 0:02dd72d1d465 461 if( ( ret = pk_group_id_from_specified( params, &grp_id ) ) != 0 )
borlanic 0:02dd72d1d465 462 return( ret );
borlanic 0:02dd72d1d465 463 #else
borlanic 0:02dd72d1d465 464 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
borlanic 0:02dd72d1d465 465 #endif
borlanic 0:02dd72d1d465 466 }
borlanic 0:02dd72d1d465 467
borlanic 0:02dd72d1d465 468 /*
borlanic 0:02dd72d1d465 469 * grp may already be initilialized; if so, make sure IDs match
borlanic 0:02dd72d1d465 470 */
borlanic 0:02dd72d1d465 471 if( grp->id != MBEDTLS_ECP_DP_NONE && grp->id != grp_id )
borlanic 0:02dd72d1d465 472 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
borlanic 0:02dd72d1d465 473
borlanic 0:02dd72d1d465 474 if( ( ret = mbedtls_ecp_group_load( grp, grp_id ) ) != 0 )
borlanic 0:02dd72d1d465 475 return( ret );
borlanic 0:02dd72d1d465 476
borlanic 0:02dd72d1d465 477 return( 0 );
borlanic 0:02dd72d1d465 478 }
borlanic 0:02dd72d1d465 479
borlanic 0:02dd72d1d465 480 /*
borlanic 0:02dd72d1d465 481 * EC public key is an EC point
borlanic 0:02dd72d1d465 482 *
borlanic 0:02dd72d1d465 483 * The caller is responsible for clearing the structure upon failure if
borlanic 0:02dd72d1d465 484 * desired. Take care to pass along the possible ECP_FEATURE_UNAVAILABLE
borlanic 0:02dd72d1d465 485 * return code of mbedtls_ecp_point_read_binary() and leave p in a usable state.
borlanic 0:02dd72d1d465 486 */
borlanic 0:02dd72d1d465 487 static int pk_get_ecpubkey( unsigned char **p, const unsigned char *end,
borlanic 0:02dd72d1d465 488 mbedtls_ecp_keypair *key )
borlanic 0:02dd72d1d465 489 {
borlanic 0:02dd72d1d465 490 int ret;
borlanic 0:02dd72d1d465 491
borlanic 0:02dd72d1d465 492 if( ( ret = mbedtls_ecp_point_read_binary( &key->grp, &key->Q,
borlanic 0:02dd72d1d465 493 (const unsigned char *) *p, end - *p ) ) == 0 )
borlanic 0:02dd72d1d465 494 {
borlanic 0:02dd72d1d465 495 ret = mbedtls_ecp_check_pubkey( &key->grp, &key->Q );
borlanic 0:02dd72d1d465 496 }
borlanic 0:02dd72d1d465 497
borlanic 0:02dd72d1d465 498 /*
borlanic 0:02dd72d1d465 499 * We know mbedtls_ecp_point_read_binary consumed all bytes or failed
borlanic 0:02dd72d1d465 500 */
borlanic 0:02dd72d1d465 501 *p = (unsigned char *) end;
borlanic 0:02dd72d1d465 502
borlanic 0:02dd72d1d465 503 return( ret );
borlanic 0:02dd72d1d465 504 }
borlanic 0:02dd72d1d465 505 #endif /* MBEDTLS_ECP_C */
borlanic 0:02dd72d1d465 506
borlanic 0:02dd72d1d465 507 #if defined(MBEDTLS_RSA_C)
borlanic 0:02dd72d1d465 508 /*
borlanic 0:02dd72d1d465 509 * RSAPublicKey ::= SEQUENCE {
borlanic 0:02dd72d1d465 510 * modulus INTEGER, -- n
borlanic 0:02dd72d1d465 511 * publicExponent INTEGER -- e
borlanic 0:02dd72d1d465 512 * }
borlanic 0:02dd72d1d465 513 */
borlanic 0:02dd72d1d465 514 static int pk_get_rsapubkey( unsigned char **p,
borlanic 0:02dd72d1d465 515 const unsigned char *end,
borlanic 0:02dd72d1d465 516 mbedtls_rsa_context *rsa )
borlanic 0:02dd72d1d465 517 {
borlanic 0:02dd72d1d465 518 int ret;
borlanic 0:02dd72d1d465 519 size_t len;
borlanic 0:02dd72d1d465 520
borlanic 0:02dd72d1d465 521 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
borlanic 0:02dd72d1d465 522 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
borlanic 0:02dd72d1d465 523 return( MBEDTLS_ERR_PK_INVALID_PUBKEY + ret );
borlanic 0:02dd72d1d465 524
borlanic 0:02dd72d1d465 525 if( *p + len != end )
borlanic 0:02dd72d1d465 526 return( MBEDTLS_ERR_PK_INVALID_PUBKEY +
borlanic 0:02dd72d1d465 527 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
borlanic 0:02dd72d1d465 528
borlanic 0:02dd72d1d465 529 /* Import N */
borlanic 0:02dd72d1d465 530 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_INTEGER ) ) != 0 )
borlanic 0:02dd72d1d465 531 return( MBEDTLS_ERR_PK_INVALID_PUBKEY + ret );
borlanic 0:02dd72d1d465 532
borlanic 0:02dd72d1d465 533 if( ( ret = mbedtls_rsa_import_raw( rsa, *p, len, NULL, 0, NULL, 0,
borlanic 0:02dd72d1d465 534 NULL, 0, NULL, 0 ) ) != 0 )
borlanic 0:02dd72d1d465 535 return( MBEDTLS_ERR_PK_INVALID_PUBKEY );
borlanic 0:02dd72d1d465 536
borlanic 0:02dd72d1d465 537 *p += len;
borlanic 0:02dd72d1d465 538
borlanic 0:02dd72d1d465 539 /* Import E */
borlanic 0:02dd72d1d465 540 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_INTEGER ) ) != 0 )
borlanic 0:02dd72d1d465 541 return( MBEDTLS_ERR_PK_INVALID_PUBKEY + ret );
borlanic 0:02dd72d1d465 542
borlanic 0:02dd72d1d465 543 if( ( ret = mbedtls_rsa_import_raw( rsa, NULL, 0, NULL, 0, NULL, 0,
borlanic 0:02dd72d1d465 544 NULL, 0, *p, len ) ) != 0 )
borlanic 0:02dd72d1d465 545 return( MBEDTLS_ERR_PK_INVALID_PUBKEY );
borlanic 0:02dd72d1d465 546
borlanic 0:02dd72d1d465 547 *p += len;
borlanic 0:02dd72d1d465 548
borlanic 0:02dd72d1d465 549 if( mbedtls_rsa_complete( rsa ) != 0 ||
borlanic 0:02dd72d1d465 550 mbedtls_rsa_check_pubkey( rsa ) != 0 )
borlanic 0:02dd72d1d465 551 {
borlanic 0:02dd72d1d465 552 return( MBEDTLS_ERR_PK_INVALID_PUBKEY );
borlanic 0:02dd72d1d465 553 }
borlanic 0:02dd72d1d465 554
borlanic 0:02dd72d1d465 555 if( *p != end )
borlanic 0:02dd72d1d465 556 return( MBEDTLS_ERR_PK_INVALID_PUBKEY +
borlanic 0:02dd72d1d465 557 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
borlanic 0:02dd72d1d465 558
borlanic 0:02dd72d1d465 559 return( 0 );
borlanic 0:02dd72d1d465 560 }
borlanic 0:02dd72d1d465 561 #endif /* MBEDTLS_RSA_C */
borlanic 0:02dd72d1d465 562
borlanic 0:02dd72d1d465 563 /* Get a PK algorithm identifier
borlanic 0:02dd72d1d465 564 *
borlanic 0:02dd72d1d465 565 * AlgorithmIdentifier ::= SEQUENCE {
borlanic 0:02dd72d1d465 566 * algorithm OBJECT IDENTIFIER,
borlanic 0:02dd72d1d465 567 * parameters ANY DEFINED BY algorithm OPTIONAL }
borlanic 0:02dd72d1d465 568 */
borlanic 0:02dd72d1d465 569 static int pk_get_pk_alg( unsigned char **p,
borlanic 0:02dd72d1d465 570 const unsigned char *end,
borlanic 0:02dd72d1d465 571 mbedtls_pk_type_t *pk_alg, mbedtls_asn1_buf *params )
borlanic 0:02dd72d1d465 572 {
borlanic 0:02dd72d1d465 573 int ret;
borlanic 0:02dd72d1d465 574 mbedtls_asn1_buf alg_oid;
borlanic 0:02dd72d1d465 575
borlanic 0:02dd72d1d465 576 memset( params, 0, sizeof(mbedtls_asn1_buf) );
borlanic 0:02dd72d1d465 577
borlanic 0:02dd72d1d465 578 if( ( ret = mbedtls_asn1_get_alg( p, end, &alg_oid, params ) ) != 0 )
borlanic 0:02dd72d1d465 579 return( MBEDTLS_ERR_PK_INVALID_ALG + ret );
borlanic 0:02dd72d1d465 580
borlanic 0:02dd72d1d465 581 if( mbedtls_oid_get_pk_alg( &alg_oid, pk_alg ) != 0 )
borlanic 0:02dd72d1d465 582 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
borlanic 0:02dd72d1d465 583
borlanic 0:02dd72d1d465 584 /*
borlanic 0:02dd72d1d465 585 * No parameters with RSA (only for EC)
borlanic 0:02dd72d1d465 586 */
borlanic 0:02dd72d1d465 587 if( *pk_alg == MBEDTLS_PK_RSA &&
borlanic 0:02dd72d1d465 588 ( ( params->tag != MBEDTLS_ASN1_NULL && params->tag != 0 ) ||
borlanic 0:02dd72d1d465 589 params->len != 0 ) )
borlanic 0:02dd72d1d465 590 {
borlanic 0:02dd72d1d465 591 return( MBEDTLS_ERR_PK_INVALID_ALG );
borlanic 0:02dd72d1d465 592 }
borlanic 0:02dd72d1d465 593
borlanic 0:02dd72d1d465 594 return( 0 );
borlanic 0:02dd72d1d465 595 }
borlanic 0:02dd72d1d465 596
borlanic 0:02dd72d1d465 597 /*
borlanic 0:02dd72d1d465 598 * SubjectPublicKeyInfo ::= SEQUENCE {
borlanic 0:02dd72d1d465 599 * algorithm AlgorithmIdentifier,
borlanic 0:02dd72d1d465 600 * subjectPublicKey BIT STRING }
borlanic 0:02dd72d1d465 601 */
borlanic 0:02dd72d1d465 602 int mbedtls_pk_parse_subpubkey( unsigned char **p, const unsigned char *end,
borlanic 0:02dd72d1d465 603 mbedtls_pk_context *pk )
borlanic 0:02dd72d1d465 604 {
borlanic 0:02dd72d1d465 605 int ret;
borlanic 0:02dd72d1d465 606 size_t len;
borlanic 0:02dd72d1d465 607 mbedtls_asn1_buf alg_params;
borlanic 0:02dd72d1d465 608 mbedtls_pk_type_t pk_alg = MBEDTLS_PK_NONE;
borlanic 0:02dd72d1d465 609 const mbedtls_pk_info_t *pk_info;
borlanic 0:02dd72d1d465 610
borlanic 0:02dd72d1d465 611 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
borlanic 0:02dd72d1d465 612 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
borlanic 0:02dd72d1d465 613 {
borlanic 0:02dd72d1d465 614 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
borlanic 0:02dd72d1d465 615 }
borlanic 0:02dd72d1d465 616
borlanic 0:02dd72d1d465 617 end = *p + len;
borlanic 0:02dd72d1d465 618
borlanic 0:02dd72d1d465 619 if( ( ret = pk_get_pk_alg( p, end, &pk_alg, &alg_params ) ) != 0 )
borlanic 0:02dd72d1d465 620 return( ret );
borlanic 0:02dd72d1d465 621
borlanic 0:02dd72d1d465 622 if( ( ret = mbedtls_asn1_get_bitstring_null( p, end, &len ) ) != 0 )
borlanic 0:02dd72d1d465 623 return( MBEDTLS_ERR_PK_INVALID_PUBKEY + ret );
borlanic 0:02dd72d1d465 624
borlanic 0:02dd72d1d465 625 if( *p + len != end )
borlanic 0:02dd72d1d465 626 return( MBEDTLS_ERR_PK_INVALID_PUBKEY +
borlanic 0:02dd72d1d465 627 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
borlanic 0:02dd72d1d465 628
borlanic 0:02dd72d1d465 629 if( ( pk_info = mbedtls_pk_info_from_type( pk_alg ) ) == NULL )
borlanic 0:02dd72d1d465 630 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
borlanic 0:02dd72d1d465 631
borlanic 0:02dd72d1d465 632 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 )
borlanic 0:02dd72d1d465 633 return( ret );
borlanic 0:02dd72d1d465 634
borlanic 0:02dd72d1d465 635 #if defined(MBEDTLS_RSA_C)
borlanic 0:02dd72d1d465 636 if( pk_alg == MBEDTLS_PK_RSA )
borlanic 0:02dd72d1d465 637 {
borlanic 0:02dd72d1d465 638 ret = pk_get_rsapubkey( p, end, mbedtls_pk_rsa( *pk ) );
borlanic 0:02dd72d1d465 639 } else
borlanic 0:02dd72d1d465 640 #endif /* MBEDTLS_RSA_C */
borlanic 0:02dd72d1d465 641 #if defined(MBEDTLS_ECP_C)
borlanic 0:02dd72d1d465 642 if( pk_alg == MBEDTLS_PK_ECKEY_DH || pk_alg == MBEDTLS_PK_ECKEY )
borlanic 0:02dd72d1d465 643 {
borlanic 0:02dd72d1d465 644 ret = pk_use_ecparams( &alg_params, &mbedtls_pk_ec( *pk )->grp );
borlanic 0:02dd72d1d465 645 if( ret == 0 )
borlanic 0:02dd72d1d465 646 ret = pk_get_ecpubkey( p, end, mbedtls_pk_ec( *pk ) );
borlanic 0:02dd72d1d465 647 } else
borlanic 0:02dd72d1d465 648 #endif /* MBEDTLS_ECP_C */
borlanic 0:02dd72d1d465 649 ret = MBEDTLS_ERR_PK_UNKNOWN_PK_ALG;
borlanic 0:02dd72d1d465 650
borlanic 0:02dd72d1d465 651 if( ret == 0 && *p != end )
borlanic 0:02dd72d1d465 652 ret = MBEDTLS_ERR_PK_INVALID_PUBKEY
borlanic 0:02dd72d1d465 653 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH;
borlanic 0:02dd72d1d465 654
borlanic 0:02dd72d1d465 655 if( ret != 0 )
borlanic 0:02dd72d1d465 656 mbedtls_pk_free( pk );
borlanic 0:02dd72d1d465 657
borlanic 0:02dd72d1d465 658 return( ret );
borlanic 0:02dd72d1d465 659 }
borlanic 0:02dd72d1d465 660
borlanic 0:02dd72d1d465 661 #if defined(MBEDTLS_RSA_C)
borlanic 0:02dd72d1d465 662 /*
borlanic 0:02dd72d1d465 663 * Parse a PKCS#1 encoded private RSA key
borlanic 0:02dd72d1d465 664 */
borlanic 0:02dd72d1d465 665 static int pk_parse_key_pkcs1_der( mbedtls_rsa_context *rsa,
borlanic 0:02dd72d1d465 666 const unsigned char *key,
borlanic 0:02dd72d1d465 667 size_t keylen )
borlanic 0:02dd72d1d465 668 {
borlanic 0:02dd72d1d465 669 int ret, version;
borlanic 0:02dd72d1d465 670 size_t len;
borlanic 0:02dd72d1d465 671 unsigned char *p, *end;
borlanic 0:02dd72d1d465 672
borlanic 0:02dd72d1d465 673 mbedtls_mpi T;
borlanic 0:02dd72d1d465 674 mbedtls_mpi_init( &T );
borlanic 0:02dd72d1d465 675
borlanic 0:02dd72d1d465 676 p = (unsigned char *) key;
borlanic 0:02dd72d1d465 677 end = p + keylen;
borlanic 0:02dd72d1d465 678
borlanic 0:02dd72d1d465 679 /*
borlanic 0:02dd72d1d465 680 * This function parses the RSAPrivateKey (PKCS#1)
borlanic 0:02dd72d1d465 681 *
borlanic 0:02dd72d1d465 682 * RSAPrivateKey ::= SEQUENCE {
borlanic 0:02dd72d1d465 683 * version Version,
borlanic 0:02dd72d1d465 684 * modulus INTEGER, -- n
borlanic 0:02dd72d1d465 685 * publicExponent INTEGER, -- e
borlanic 0:02dd72d1d465 686 * privateExponent INTEGER, -- d
borlanic 0:02dd72d1d465 687 * prime1 INTEGER, -- p
borlanic 0:02dd72d1d465 688 * prime2 INTEGER, -- q
borlanic 0:02dd72d1d465 689 * exponent1 INTEGER, -- d mod (p-1)
borlanic 0:02dd72d1d465 690 * exponent2 INTEGER, -- d mod (q-1)
borlanic 0:02dd72d1d465 691 * coefficient INTEGER, -- (inverse of q) mod p
borlanic 0:02dd72d1d465 692 * otherPrimeInfos OtherPrimeInfos OPTIONAL
borlanic 0:02dd72d1d465 693 * }
borlanic 0:02dd72d1d465 694 */
borlanic 0:02dd72d1d465 695 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
borlanic 0:02dd72d1d465 696 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
borlanic 0:02dd72d1d465 697 {
borlanic 0:02dd72d1d465 698 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
borlanic 0:02dd72d1d465 699 }
borlanic 0:02dd72d1d465 700
borlanic 0:02dd72d1d465 701 end = p + len;
borlanic 0:02dd72d1d465 702
borlanic 0:02dd72d1d465 703 if( ( ret = mbedtls_asn1_get_int( &p, end, &version ) ) != 0 )
borlanic 0:02dd72d1d465 704 {
borlanic 0:02dd72d1d465 705 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
borlanic 0:02dd72d1d465 706 }
borlanic 0:02dd72d1d465 707
borlanic 0:02dd72d1d465 708 if( version != 0 )
borlanic 0:02dd72d1d465 709 {
borlanic 0:02dd72d1d465 710 return( MBEDTLS_ERR_PK_KEY_INVALID_VERSION );
borlanic 0:02dd72d1d465 711 }
borlanic 0:02dd72d1d465 712
borlanic 0:02dd72d1d465 713 /* Import N */
borlanic 0:02dd72d1d465 714 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
borlanic 0:02dd72d1d465 715 MBEDTLS_ASN1_INTEGER ) ) != 0 ||
borlanic 0:02dd72d1d465 716 ( ret = mbedtls_rsa_import_raw( rsa, p, len, NULL, 0, NULL, 0,
borlanic 0:02dd72d1d465 717 NULL, 0, NULL, 0 ) ) != 0 )
borlanic 0:02dd72d1d465 718 goto cleanup;
borlanic 0:02dd72d1d465 719 p += len;
borlanic 0:02dd72d1d465 720
borlanic 0:02dd72d1d465 721 /* Import E */
borlanic 0:02dd72d1d465 722 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
borlanic 0:02dd72d1d465 723 MBEDTLS_ASN1_INTEGER ) ) != 0 ||
borlanic 0:02dd72d1d465 724 ( ret = mbedtls_rsa_import_raw( rsa, NULL, 0, NULL, 0, NULL, 0,
borlanic 0:02dd72d1d465 725 NULL, 0, p, len ) ) != 0 )
borlanic 0:02dd72d1d465 726 goto cleanup;
borlanic 0:02dd72d1d465 727 p += len;
borlanic 0:02dd72d1d465 728
borlanic 0:02dd72d1d465 729 /* Import D */
borlanic 0:02dd72d1d465 730 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
borlanic 0:02dd72d1d465 731 MBEDTLS_ASN1_INTEGER ) ) != 0 ||
borlanic 0:02dd72d1d465 732 ( ret = mbedtls_rsa_import_raw( rsa, NULL, 0, NULL, 0, NULL, 0,
borlanic 0:02dd72d1d465 733 p, len, NULL, 0 ) ) != 0 )
borlanic 0:02dd72d1d465 734 goto cleanup;
borlanic 0:02dd72d1d465 735 p += len;
borlanic 0:02dd72d1d465 736
borlanic 0:02dd72d1d465 737 /* Import P */
borlanic 0:02dd72d1d465 738 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
borlanic 0:02dd72d1d465 739 MBEDTLS_ASN1_INTEGER ) ) != 0 ||
borlanic 0:02dd72d1d465 740 ( ret = mbedtls_rsa_import_raw( rsa, NULL, 0, p, len, NULL, 0,
borlanic 0:02dd72d1d465 741 NULL, 0, NULL, 0 ) ) != 0 )
borlanic 0:02dd72d1d465 742 goto cleanup;
borlanic 0:02dd72d1d465 743 p += len;
borlanic 0:02dd72d1d465 744
borlanic 0:02dd72d1d465 745 /* Import Q */
borlanic 0:02dd72d1d465 746 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
borlanic 0:02dd72d1d465 747 MBEDTLS_ASN1_INTEGER ) ) != 0 ||
borlanic 0:02dd72d1d465 748 ( ret = mbedtls_rsa_import_raw( rsa, NULL, 0, NULL, 0, p, len,
borlanic 0:02dd72d1d465 749 NULL, 0, NULL, 0 ) ) != 0 )
borlanic 0:02dd72d1d465 750 goto cleanup;
borlanic 0:02dd72d1d465 751 p += len;
borlanic 0:02dd72d1d465 752
borlanic 0:02dd72d1d465 753 /* Complete the RSA private key */
borlanic 0:02dd72d1d465 754 if( ( ret = mbedtls_rsa_complete( rsa ) ) != 0 )
borlanic 0:02dd72d1d465 755 goto cleanup;
borlanic 0:02dd72d1d465 756
borlanic 0:02dd72d1d465 757 /* Check optional parameters */
borlanic 0:02dd72d1d465 758 if( ( ret = mbedtls_asn1_get_mpi( &p, end, &T ) ) != 0 ||
borlanic 0:02dd72d1d465 759 ( ret = mbedtls_asn1_get_mpi( &p, end, &T ) ) != 0 ||
borlanic 0:02dd72d1d465 760 ( ret = mbedtls_asn1_get_mpi( &p, end, &T ) ) != 0 )
borlanic 0:02dd72d1d465 761 goto cleanup;
borlanic 0:02dd72d1d465 762
borlanic 0:02dd72d1d465 763 if( p != end )
borlanic 0:02dd72d1d465 764 {
borlanic 0:02dd72d1d465 765 ret = MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
borlanic 0:02dd72d1d465 766 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ;
borlanic 0:02dd72d1d465 767 }
borlanic 0:02dd72d1d465 768
borlanic 0:02dd72d1d465 769 cleanup:
borlanic 0:02dd72d1d465 770
borlanic 0:02dd72d1d465 771 mbedtls_mpi_free( &T );
borlanic 0:02dd72d1d465 772
borlanic 0:02dd72d1d465 773 if( ret != 0 )
borlanic 0:02dd72d1d465 774 {
borlanic 0:02dd72d1d465 775 /* Wrap error code if it's coming from a lower level */
borlanic 0:02dd72d1d465 776 if( ( ret & 0xff80 ) == 0 )
borlanic 0:02dd72d1d465 777 ret = MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret;
borlanic 0:02dd72d1d465 778 else
borlanic 0:02dd72d1d465 779 ret = MBEDTLS_ERR_PK_KEY_INVALID_FORMAT;
borlanic 0:02dd72d1d465 780
borlanic 0:02dd72d1d465 781 mbedtls_rsa_free( rsa );
borlanic 0:02dd72d1d465 782 }
borlanic 0:02dd72d1d465 783
borlanic 0:02dd72d1d465 784 return( ret );
borlanic 0:02dd72d1d465 785 }
borlanic 0:02dd72d1d465 786 #endif /* MBEDTLS_RSA_C */
borlanic 0:02dd72d1d465 787
borlanic 0:02dd72d1d465 788 #if defined(MBEDTLS_ECP_C)
borlanic 0:02dd72d1d465 789 /*
borlanic 0:02dd72d1d465 790 * Parse a SEC1 encoded private EC key
borlanic 0:02dd72d1d465 791 */
borlanic 0:02dd72d1d465 792 static int pk_parse_key_sec1_der( mbedtls_ecp_keypair *eck,
borlanic 0:02dd72d1d465 793 const unsigned char *key,
borlanic 0:02dd72d1d465 794 size_t keylen )
borlanic 0:02dd72d1d465 795 {
borlanic 0:02dd72d1d465 796 int ret;
borlanic 0:02dd72d1d465 797 int version, pubkey_done;
borlanic 0:02dd72d1d465 798 size_t len;
borlanic 0:02dd72d1d465 799 mbedtls_asn1_buf params;
borlanic 0:02dd72d1d465 800 unsigned char *p = (unsigned char *) key;
borlanic 0:02dd72d1d465 801 unsigned char *end = p + keylen;
borlanic 0:02dd72d1d465 802 unsigned char *end2;
borlanic 0:02dd72d1d465 803
borlanic 0:02dd72d1d465 804 /*
borlanic 0:02dd72d1d465 805 * RFC 5915, or SEC1 Appendix C.4
borlanic 0:02dd72d1d465 806 *
borlanic 0:02dd72d1d465 807 * ECPrivateKey ::= SEQUENCE {
borlanic 0:02dd72d1d465 808 * version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
borlanic 0:02dd72d1d465 809 * privateKey OCTET STRING,
borlanic 0:02dd72d1d465 810 * parameters [0] ECParameters {{ NamedCurve }} OPTIONAL,
borlanic 0:02dd72d1d465 811 * publicKey [1] BIT STRING OPTIONAL
borlanic 0:02dd72d1d465 812 * }
borlanic 0:02dd72d1d465 813 */
borlanic 0:02dd72d1d465 814 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
borlanic 0:02dd72d1d465 815 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
borlanic 0:02dd72d1d465 816 {
borlanic 0:02dd72d1d465 817 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
borlanic 0:02dd72d1d465 818 }
borlanic 0:02dd72d1d465 819
borlanic 0:02dd72d1d465 820 end = p + len;
borlanic 0:02dd72d1d465 821
borlanic 0:02dd72d1d465 822 if( ( ret = mbedtls_asn1_get_int( &p, end, &version ) ) != 0 )
borlanic 0:02dd72d1d465 823 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
borlanic 0:02dd72d1d465 824
borlanic 0:02dd72d1d465 825 if( version != 1 )
borlanic 0:02dd72d1d465 826 return( MBEDTLS_ERR_PK_KEY_INVALID_VERSION );
borlanic 0:02dd72d1d465 827
borlanic 0:02dd72d1d465 828 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
borlanic 0:02dd72d1d465 829 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
borlanic 0:02dd72d1d465 830
borlanic 0:02dd72d1d465 831 if( ( ret = mbedtls_mpi_read_binary( &eck->d, p, len ) ) != 0 )
borlanic 0:02dd72d1d465 832 {
borlanic 0:02dd72d1d465 833 mbedtls_ecp_keypair_free( eck );
borlanic 0:02dd72d1d465 834 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
borlanic 0:02dd72d1d465 835 }
borlanic 0:02dd72d1d465 836
borlanic 0:02dd72d1d465 837 p += len;
borlanic 0:02dd72d1d465 838
borlanic 0:02dd72d1d465 839 pubkey_done = 0;
borlanic 0:02dd72d1d465 840 if( p != end )
borlanic 0:02dd72d1d465 841 {
borlanic 0:02dd72d1d465 842 /*
borlanic 0:02dd72d1d465 843 * Is 'parameters' present?
borlanic 0:02dd72d1d465 844 */
borlanic 0:02dd72d1d465 845 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
borlanic 0:02dd72d1d465 846 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 0 ) ) == 0 )
borlanic 0:02dd72d1d465 847 {
borlanic 0:02dd72d1d465 848 if( ( ret = pk_get_ecparams( &p, p + len, &params) ) != 0 ||
borlanic 0:02dd72d1d465 849 ( ret = pk_use_ecparams( &params, &eck->grp ) ) != 0 )
borlanic 0:02dd72d1d465 850 {
borlanic 0:02dd72d1d465 851 mbedtls_ecp_keypair_free( eck );
borlanic 0:02dd72d1d465 852 return( ret );
borlanic 0:02dd72d1d465 853 }
borlanic 0:02dd72d1d465 854 }
borlanic 0:02dd72d1d465 855 else if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
borlanic 0:02dd72d1d465 856 {
borlanic 0:02dd72d1d465 857 mbedtls_ecp_keypair_free( eck );
borlanic 0:02dd72d1d465 858 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
borlanic 0:02dd72d1d465 859 }
borlanic 0:02dd72d1d465 860
borlanic 0:02dd72d1d465 861 /*
borlanic 0:02dd72d1d465 862 * Is 'publickey' present? If not, or if we can't read it (eg because it
borlanic 0:02dd72d1d465 863 * is compressed), create it from the private key.
borlanic 0:02dd72d1d465 864 */
borlanic 0:02dd72d1d465 865 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
borlanic 0:02dd72d1d465 866 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 1 ) ) == 0 )
borlanic 0:02dd72d1d465 867 {
borlanic 0:02dd72d1d465 868 end2 = p + len;
borlanic 0:02dd72d1d465 869
borlanic 0:02dd72d1d465 870 if( ( ret = mbedtls_asn1_get_bitstring_null( &p, end2, &len ) ) != 0 )
borlanic 0:02dd72d1d465 871 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
borlanic 0:02dd72d1d465 872
borlanic 0:02dd72d1d465 873 if( p + len != end2 )
borlanic 0:02dd72d1d465 874 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
borlanic 0:02dd72d1d465 875 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
borlanic 0:02dd72d1d465 876
borlanic 0:02dd72d1d465 877 if( ( ret = pk_get_ecpubkey( &p, end2, eck ) ) == 0 )
borlanic 0:02dd72d1d465 878 pubkey_done = 1;
borlanic 0:02dd72d1d465 879 else
borlanic 0:02dd72d1d465 880 {
borlanic 0:02dd72d1d465 881 /*
borlanic 0:02dd72d1d465 882 * The only acceptable failure mode of pk_get_ecpubkey() above
borlanic 0:02dd72d1d465 883 * is if the point format is not recognized.
borlanic 0:02dd72d1d465 884 */
borlanic 0:02dd72d1d465 885 if( ret != MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE )
borlanic 0:02dd72d1d465 886 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
borlanic 0:02dd72d1d465 887 }
borlanic 0:02dd72d1d465 888 }
borlanic 0:02dd72d1d465 889 else if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
borlanic 0:02dd72d1d465 890 {
borlanic 0:02dd72d1d465 891 mbedtls_ecp_keypair_free( eck );
borlanic 0:02dd72d1d465 892 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
borlanic 0:02dd72d1d465 893 }
borlanic 0:02dd72d1d465 894 }
borlanic 0:02dd72d1d465 895
borlanic 0:02dd72d1d465 896 if( ! pubkey_done &&
borlanic 0:02dd72d1d465 897 ( ret = mbedtls_ecp_mul( &eck->grp, &eck->Q, &eck->d, &eck->grp.G,
borlanic 0:02dd72d1d465 898 NULL, NULL ) ) != 0 )
borlanic 0:02dd72d1d465 899 {
borlanic 0:02dd72d1d465 900 mbedtls_ecp_keypair_free( eck );
borlanic 0:02dd72d1d465 901 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
borlanic 0:02dd72d1d465 902 }
borlanic 0:02dd72d1d465 903
borlanic 0:02dd72d1d465 904 if( ( ret = mbedtls_ecp_check_privkey( &eck->grp, &eck->d ) ) != 0 )
borlanic 0:02dd72d1d465 905 {
borlanic 0:02dd72d1d465 906 mbedtls_ecp_keypair_free( eck );
borlanic 0:02dd72d1d465 907 return( ret );
borlanic 0:02dd72d1d465 908 }
borlanic 0:02dd72d1d465 909
borlanic 0:02dd72d1d465 910 return( 0 );
borlanic 0:02dd72d1d465 911 }
borlanic 0:02dd72d1d465 912 #endif /* MBEDTLS_ECP_C */
borlanic 0:02dd72d1d465 913
borlanic 0:02dd72d1d465 914 /*
borlanic 0:02dd72d1d465 915 * Parse an unencrypted PKCS#8 encoded private key
borlanic 0:02dd72d1d465 916 *
borlanic 0:02dd72d1d465 917 * Notes:
borlanic 0:02dd72d1d465 918 *
borlanic 0:02dd72d1d465 919 * - This function does not own the key buffer. It is the
borlanic 0:02dd72d1d465 920 * responsibility of the caller to take care of zeroizing
borlanic 0:02dd72d1d465 921 * and freeing it after use.
borlanic 0:02dd72d1d465 922 *
borlanic 0:02dd72d1d465 923 * - The function is responsible for freeing the provided
borlanic 0:02dd72d1d465 924 * PK context on failure.
borlanic 0:02dd72d1d465 925 *
borlanic 0:02dd72d1d465 926 */
borlanic 0:02dd72d1d465 927 static int pk_parse_key_pkcs8_unencrypted_der(
borlanic 0:02dd72d1d465 928 mbedtls_pk_context *pk,
borlanic 0:02dd72d1d465 929 const unsigned char* key,
borlanic 0:02dd72d1d465 930 size_t keylen )
borlanic 0:02dd72d1d465 931 {
borlanic 0:02dd72d1d465 932 int ret, version;
borlanic 0:02dd72d1d465 933 size_t len;
borlanic 0:02dd72d1d465 934 mbedtls_asn1_buf params;
borlanic 0:02dd72d1d465 935 unsigned char *p = (unsigned char *) key;
borlanic 0:02dd72d1d465 936 unsigned char *end = p + keylen;
borlanic 0:02dd72d1d465 937 mbedtls_pk_type_t pk_alg = MBEDTLS_PK_NONE;
borlanic 0:02dd72d1d465 938 const mbedtls_pk_info_t *pk_info;
borlanic 0:02dd72d1d465 939
borlanic 0:02dd72d1d465 940 /*
borlanic 0:02dd72d1d465 941 * This function parses the PrivateKeyInfo object (PKCS#8 v1.2 = RFC 5208)
borlanic 0:02dd72d1d465 942 *
borlanic 0:02dd72d1d465 943 * PrivateKeyInfo ::= SEQUENCE {
borlanic 0:02dd72d1d465 944 * version Version,
borlanic 0:02dd72d1d465 945 * privateKeyAlgorithm PrivateKeyAlgorithmIdentifier,
borlanic 0:02dd72d1d465 946 * privateKey PrivateKey,
borlanic 0:02dd72d1d465 947 * attributes [0] IMPLICIT Attributes OPTIONAL }
borlanic 0:02dd72d1d465 948 *
borlanic 0:02dd72d1d465 949 * Version ::= INTEGER
borlanic 0:02dd72d1d465 950 * PrivateKeyAlgorithmIdentifier ::= AlgorithmIdentifier
borlanic 0:02dd72d1d465 951 * PrivateKey ::= OCTET STRING
borlanic 0:02dd72d1d465 952 *
borlanic 0:02dd72d1d465 953 * The PrivateKey OCTET STRING is a SEC1 ECPrivateKey
borlanic 0:02dd72d1d465 954 */
borlanic 0:02dd72d1d465 955
borlanic 0:02dd72d1d465 956 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
borlanic 0:02dd72d1d465 957 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
borlanic 0:02dd72d1d465 958 {
borlanic 0:02dd72d1d465 959 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
borlanic 0:02dd72d1d465 960 }
borlanic 0:02dd72d1d465 961
borlanic 0:02dd72d1d465 962 end = p + len;
borlanic 0:02dd72d1d465 963
borlanic 0:02dd72d1d465 964 if( ( ret = mbedtls_asn1_get_int( &p, end, &version ) ) != 0 )
borlanic 0:02dd72d1d465 965 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
borlanic 0:02dd72d1d465 966
borlanic 0:02dd72d1d465 967 if( version != 0 )
borlanic 0:02dd72d1d465 968 return( MBEDTLS_ERR_PK_KEY_INVALID_VERSION + ret );
borlanic 0:02dd72d1d465 969
borlanic 0:02dd72d1d465 970 if( ( ret = pk_get_pk_alg( &p, end, &pk_alg, &params ) ) != 0 )
borlanic 0:02dd72d1d465 971 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
borlanic 0:02dd72d1d465 972
borlanic 0:02dd72d1d465 973 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
borlanic 0:02dd72d1d465 974 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
borlanic 0:02dd72d1d465 975
borlanic 0:02dd72d1d465 976 if( len < 1 )
borlanic 0:02dd72d1d465 977 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
borlanic 0:02dd72d1d465 978 MBEDTLS_ERR_ASN1_OUT_OF_DATA );
borlanic 0:02dd72d1d465 979
borlanic 0:02dd72d1d465 980 if( ( pk_info = mbedtls_pk_info_from_type( pk_alg ) ) == NULL )
borlanic 0:02dd72d1d465 981 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
borlanic 0:02dd72d1d465 982
borlanic 0:02dd72d1d465 983 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 )
borlanic 0:02dd72d1d465 984 return( ret );
borlanic 0:02dd72d1d465 985
borlanic 0:02dd72d1d465 986 #if defined(MBEDTLS_RSA_C)
borlanic 0:02dd72d1d465 987 if( pk_alg == MBEDTLS_PK_RSA )
borlanic 0:02dd72d1d465 988 {
borlanic 0:02dd72d1d465 989 if( ( ret = pk_parse_key_pkcs1_der( mbedtls_pk_rsa( *pk ), p, len ) ) != 0 )
borlanic 0:02dd72d1d465 990 {
borlanic 0:02dd72d1d465 991 mbedtls_pk_free( pk );
borlanic 0:02dd72d1d465 992 return( ret );
borlanic 0:02dd72d1d465 993 }
borlanic 0:02dd72d1d465 994 } else
borlanic 0:02dd72d1d465 995 #endif /* MBEDTLS_RSA_C */
borlanic 0:02dd72d1d465 996 #if defined(MBEDTLS_ECP_C)
borlanic 0:02dd72d1d465 997 if( pk_alg == MBEDTLS_PK_ECKEY || pk_alg == MBEDTLS_PK_ECKEY_DH )
borlanic 0:02dd72d1d465 998 {
borlanic 0:02dd72d1d465 999 if( ( ret = pk_use_ecparams( &params, &mbedtls_pk_ec( *pk )->grp ) ) != 0 ||
borlanic 0:02dd72d1d465 1000 ( ret = pk_parse_key_sec1_der( mbedtls_pk_ec( *pk ), p, len ) ) != 0 )
borlanic 0:02dd72d1d465 1001 {
borlanic 0:02dd72d1d465 1002 mbedtls_pk_free( pk );
borlanic 0:02dd72d1d465 1003 return( ret );
borlanic 0:02dd72d1d465 1004 }
borlanic 0:02dd72d1d465 1005 } else
borlanic 0:02dd72d1d465 1006 #endif /* MBEDTLS_ECP_C */
borlanic 0:02dd72d1d465 1007 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
borlanic 0:02dd72d1d465 1008
borlanic 0:02dd72d1d465 1009 return( 0 );
borlanic 0:02dd72d1d465 1010 }
borlanic 0:02dd72d1d465 1011
borlanic 0:02dd72d1d465 1012 /*
borlanic 0:02dd72d1d465 1013 * Parse an encrypted PKCS#8 encoded private key
borlanic 0:02dd72d1d465 1014 *
borlanic 0:02dd72d1d465 1015 * To save space, the decryption happens in-place on the given key buffer.
borlanic 0:02dd72d1d465 1016 * Also, while this function may modify the keybuffer, it doesn't own it,
borlanic 0:02dd72d1d465 1017 * and instead it is the responsibility of the caller to zeroize and properly
borlanic 0:02dd72d1d465 1018 * free it after use.
borlanic 0:02dd72d1d465 1019 *
borlanic 0:02dd72d1d465 1020 */
borlanic 0:02dd72d1d465 1021 #if defined(MBEDTLS_PKCS12_C) || defined(MBEDTLS_PKCS5_C)
borlanic 0:02dd72d1d465 1022 static int pk_parse_key_pkcs8_encrypted_der(
borlanic 0:02dd72d1d465 1023 mbedtls_pk_context *pk,
borlanic 0:02dd72d1d465 1024 unsigned char *key, size_t keylen,
borlanic 0:02dd72d1d465 1025 const unsigned char *pwd, size_t pwdlen )
borlanic 0:02dd72d1d465 1026 {
borlanic 0:02dd72d1d465 1027 int ret, decrypted = 0;
borlanic 0:02dd72d1d465 1028 size_t len;
borlanic 0:02dd72d1d465 1029 unsigned char *buf;
borlanic 0:02dd72d1d465 1030 unsigned char *p, *end;
borlanic 0:02dd72d1d465 1031 mbedtls_asn1_buf pbe_alg_oid, pbe_params;
borlanic 0:02dd72d1d465 1032 #if defined(MBEDTLS_PKCS12_C)
borlanic 0:02dd72d1d465 1033 mbedtls_cipher_type_t cipher_alg;
borlanic 0:02dd72d1d465 1034 mbedtls_md_type_t md_alg;
borlanic 0:02dd72d1d465 1035 #endif
borlanic 0:02dd72d1d465 1036
borlanic 0:02dd72d1d465 1037 p = key;
borlanic 0:02dd72d1d465 1038 end = p + keylen;
borlanic 0:02dd72d1d465 1039
borlanic 0:02dd72d1d465 1040 if( pwdlen == 0 )
borlanic 0:02dd72d1d465 1041 return( MBEDTLS_ERR_PK_PASSWORD_REQUIRED );
borlanic 0:02dd72d1d465 1042
borlanic 0:02dd72d1d465 1043 /*
borlanic 0:02dd72d1d465 1044 * This function parses the EncryptedPrivateKeyInfo object (PKCS#8)
borlanic 0:02dd72d1d465 1045 *
borlanic 0:02dd72d1d465 1046 * EncryptedPrivateKeyInfo ::= SEQUENCE {
borlanic 0:02dd72d1d465 1047 * encryptionAlgorithm EncryptionAlgorithmIdentifier,
borlanic 0:02dd72d1d465 1048 * encryptedData EncryptedData
borlanic 0:02dd72d1d465 1049 * }
borlanic 0:02dd72d1d465 1050 *
borlanic 0:02dd72d1d465 1051 * EncryptionAlgorithmIdentifier ::= AlgorithmIdentifier
borlanic 0:02dd72d1d465 1052 *
borlanic 0:02dd72d1d465 1053 * EncryptedData ::= OCTET STRING
borlanic 0:02dd72d1d465 1054 *
borlanic 0:02dd72d1d465 1055 * The EncryptedData OCTET STRING is a PKCS#8 PrivateKeyInfo
borlanic 0:02dd72d1d465 1056 *
borlanic 0:02dd72d1d465 1057 */
borlanic 0:02dd72d1d465 1058 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
borlanic 0:02dd72d1d465 1059 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
borlanic 0:02dd72d1d465 1060 {
borlanic 0:02dd72d1d465 1061 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
borlanic 0:02dd72d1d465 1062 }
borlanic 0:02dd72d1d465 1063
borlanic 0:02dd72d1d465 1064 end = p + len;
borlanic 0:02dd72d1d465 1065
borlanic 0:02dd72d1d465 1066 if( ( ret = mbedtls_asn1_get_alg( &p, end, &pbe_alg_oid, &pbe_params ) ) != 0 )
borlanic 0:02dd72d1d465 1067 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
borlanic 0:02dd72d1d465 1068
borlanic 0:02dd72d1d465 1069 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
borlanic 0:02dd72d1d465 1070 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
borlanic 0:02dd72d1d465 1071
borlanic 0:02dd72d1d465 1072 buf = p;
borlanic 0:02dd72d1d465 1073
borlanic 0:02dd72d1d465 1074 /*
borlanic 0:02dd72d1d465 1075 * Decrypt EncryptedData with appropriate PBE
borlanic 0:02dd72d1d465 1076 */
borlanic 0:02dd72d1d465 1077 #if defined(MBEDTLS_PKCS12_C)
borlanic 0:02dd72d1d465 1078 if( mbedtls_oid_get_pkcs12_pbe_alg( &pbe_alg_oid, &md_alg, &cipher_alg ) == 0 )
borlanic 0:02dd72d1d465 1079 {
borlanic 0:02dd72d1d465 1080 if( ( ret = mbedtls_pkcs12_pbe( &pbe_params, MBEDTLS_PKCS12_PBE_DECRYPT,
borlanic 0:02dd72d1d465 1081 cipher_alg, md_alg,
borlanic 0:02dd72d1d465 1082 pwd, pwdlen, p, len, buf ) ) != 0 )
borlanic 0:02dd72d1d465 1083 {
borlanic 0:02dd72d1d465 1084 if( ret == MBEDTLS_ERR_PKCS12_PASSWORD_MISMATCH )
borlanic 0:02dd72d1d465 1085 return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
borlanic 0:02dd72d1d465 1086
borlanic 0:02dd72d1d465 1087 return( ret );
borlanic 0:02dd72d1d465 1088 }
borlanic 0:02dd72d1d465 1089
borlanic 0:02dd72d1d465 1090 decrypted = 1;
borlanic 0:02dd72d1d465 1091 }
borlanic 0:02dd72d1d465 1092 else if( MBEDTLS_OID_CMP( MBEDTLS_OID_PKCS12_PBE_SHA1_RC4_128, &pbe_alg_oid ) == 0 )
borlanic 0:02dd72d1d465 1093 {
borlanic 0:02dd72d1d465 1094 if( ( ret = mbedtls_pkcs12_pbe_sha1_rc4_128( &pbe_params,
borlanic 0:02dd72d1d465 1095 MBEDTLS_PKCS12_PBE_DECRYPT,
borlanic 0:02dd72d1d465 1096 pwd, pwdlen,
borlanic 0:02dd72d1d465 1097 p, len, buf ) ) != 0 )
borlanic 0:02dd72d1d465 1098 {
borlanic 0:02dd72d1d465 1099 return( ret );
borlanic 0:02dd72d1d465 1100 }
borlanic 0:02dd72d1d465 1101
borlanic 0:02dd72d1d465 1102 // Best guess for password mismatch when using RC4. If first tag is
borlanic 0:02dd72d1d465 1103 // not MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE
borlanic 0:02dd72d1d465 1104 //
borlanic 0:02dd72d1d465 1105 if( *buf != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) )
borlanic 0:02dd72d1d465 1106 return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
borlanic 0:02dd72d1d465 1107
borlanic 0:02dd72d1d465 1108 decrypted = 1;
borlanic 0:02dd72d1d465 1109 }
borlanic 0:02dd72d1d465 1110 else
borlanic 0:02dd72d1d465 1111 #endif /* MBEDTLS_PKCS12_C */
borlanic 0:02dd72d1d465 1112 #if defined(MBEDTLS_PKCS5_C)
borlanic 0:02dd72d1d465 1113 if( MBEDTLS_OID_CMP( MBEDTLS_OID_PKCS5_PBES2, &pbe_alg_oid ) == 0 )
borlanic 0:02dd72d1d465 1114 {
borlanic 0:02dd72d1d465 1115 if( ( ret = mbedtls_pkcs5_pbes2( &pbe_params, MBEDTLS_PKCS5_DECRYPT, pwd, pwdlen,
borlanic 0:02dd72d1d465 1116 p, len, buf ) ) != 0 )
borlanic 0:02dd72d1d465 1117 {
borlanic 0:02dd72d1d465 1118 if( ret == MBEDTLS_ERR_PKCS5_PASSWORD_MISMATCH )
borlanic 0:02dd72d1d465 1119 return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
borlanic 0:02dd72d1d465 1120
borlanic 0:02dd72d1d465 1121 return( ret );
borlanic 0:02dd72d1d465 1122 }
borlanic 0:02dd72d1d465 1123
borlanic 0:02dd72d1d465 1124 decrypted = 1;
borlanic 0:02dd72d1d465 1125 }
borlanic 0:02dd72d1d465 1126 else
borlanic 0:02dd72d1d465 1127 #endif /* MBEDTLS_PKCS5_C */
borlanic 0:02dd72d1d465 1128 {
borlanic 0:02dd72d1d465 1129 ((void) pwd);
borlanic 0:02dd72d1d465 1130 }
borlanic 0:02dd72d1d465 1131
borlanic 0:02dd72d1d465 1132 if( decrypted == 0 )
borlanic 0:02dd72d1d465 1133 return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
borlanic 0:02dd72d1d465 1134
borlanic 0:02dd72d1d465 1135 return( pk_parse_key_pkcs8_unencrypted_der( pk, buf, len ) );
borlanic 0:02dd72d1d465 1136 }
borlanic 0:02dd72d1d465 1137 #endif /* MBEDTLS_PKCS12_C || MBEDTLS_PKCS5_C */
borlanic 0:02dd72d1d465 1138
borlanic 0:02dd72d1d465 1139 /*
borlanic 0:02dd72d1d465 1140 * Parse a private key
borlanic 0:02dd72d1d465 1141 */
borlanic 0:02dd72d1d465 1142 int mbedtls_pk_parse_key( mbedtls_pk_context *pk,
borlanic 0:02dd72d1d465 1143 const unsigned char *key, size_t keylen,
borlanic 0:02dd72d1d465 1144 const unsigned char *pwd, size_t pwdlen )
borlanic 0:02dd72d1d465 1145 {
borlanic 0:02dd72d1d465 1146 int ret;
borlanic 0:02dd72d1d465 1147 const mbedtls_pk_info_t *pk_info;
borlanic 0:02dd72d1d465 1148
borlanic 0:02dd72d1d465 1149 #if defined(MBEDTLS_PEM_PARSE_C)
borlanic 0:02dd72d1d465 1150 size_t len;
borlanic 0:02dd72d1d465 1151 mbedtls_pem_context pem;
borlanic 0:02dd72d1d465 1152
borlanic 0:02dd72d1d465 1153 mbedtls_pem_init( &pem );
borlanic 0:02dd72d1d465 1154
borlanic 0:02dd72d1d465 1155 #if defined(MBEDTLS_RSA_C)
borlanic 0:02dd72d1d465 1156 /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
borlanic 0:02dd72d1d465 1157 if( keylen == 0 || key[keylen - 1] != '\0' )
borlanic 0:02dd72d1d465 1158 ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
borlanic 0:02dd72d1d465 1159 else
borlanic 0:02dd72d1d465 1160 ret = mbedtls_pem_read_buffer( &pem,
borlanic 0:02dd72d1d465 1161 "-----BEGIN RSA PRIVATE KEY-----",
borlanic 0:02dd72d1d465 1162 "-----END RSA PRIVATE KEY-----",
borlanic 0:02dd72d1d465 1163 key, pwd, pwdlen, &len );
borlanic 0:02dd72d1d465 1164
borlanic 0:02dd72d1d465 1165 if( ret == 0 )
borlanic 0:02dd72d1d465 1166 {
borlanic 0:02dd72d1d465 1167 pk_info = mbedtls_pk_info_from_type( MBEDTLS_PK_RSA );
borlanic 0:02dd72d1d465 1168 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 ||
borlanic 0:02dd72d1d465 1169 ( ret = pk_parse_key_pkcs1_der( mbedtls_pk_rsa( *pk ),
borlanic 0:02dd72d1d465 1170 pem.buf, pem.buflen ) ) != 0 )
borlanic 0:02dd72d1d465 1171 {
borlanic 0:02dd72d1d465 1172 mbedtls_pk_free( pk );
borlanic 0:02dd72d1d465 1173 }
borlanic 0:02dd72d1d465 1174
borlanic 0:02dd72d1d465 1175 mbedtls_pem_free( &pem );
borlanic 0:02dd72d1d465 1176 return( ret );
borlanic 0:02dd72d1d465 1177 }
borlanic 0:02dd72d1d465 1178 else if( ret == MBEDTLS_ERR_PEM_PASSWORD_MISMATCH )
borlanic 0:02dd72d1d465 1179 return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
borlanic 0:02dd72d1d465 1180 else if( ret == MBEDTLS_ERR_PEM_PASSWORD_REQUIRED )
borlanic 0:02dd72d1d465 1181 return( MBEDTLS_ERR_PK_PASSWORD_REQUIRED );
borlanic 0:02dd72d1d465 1182 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
borlanic 0:02dd72d1d465 1183 return( ret );
borlanic 0:02dd72d1d465 1184 #endif /* MBEDTLS_RSA_C */
borlanic 0:02dd72d1d465 1185
borlanic 0:02dd72d1d465 1186 #if defined(MBEDTLS_ECP_C)
borlanic 0:02dd72d1d465 1187 /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
borlanic 0:02dd72d1d465 1188 if( keylen == 0 || key[keylen - 1] != '\0' )
borlanic 0:02dd72d1d465 1189 ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
borlanic 0:02dd72d1d465 1190 else
borlanic 0:02dd72d1d465 1191 ret = mbedtls_pem_read_buffer( &pem,
borlanic 0:02dd72d1d465 1192 "-----BEGIN EC PRIVATE KEY-----",
borlanic 0:02dd72d1d465 1193 "-----END EC PRIVATE KEY-----",
borlanic 0:02dd72d1d465 1194 key, pwd, pwdlen, &len );
borlanic 0:02dd72d1d465 1195 if( ret == 0 )
borlanic 0:02dd72d1d465 1196 {
borlanic 0:02dd72d1d465 1197 pk_info = mbedtls_pk_info_from_type( MBEDTLS_PK_ECKEY );
borlanic 0:02dd72d1d465 1198
borlanic 0:02dd72d1d465 1199 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 ||
borlanic 0:02dd72d1d465 1200 ( ret = pk_parse_key_sec1_der( mbedtls_pk_ec( *pk ),
borlanic 0:02dd72d1d465 1201 pem.buf, pem.buflen ) ) != 0 )
borlanic 0:02dd72d1d465 1202 {
borlanic 0:02dd72d1d465 1203 mbedtls_pk_free( pk );
borlanic 0:02dd72d1d465 1204 }
borlanic 0:02dd72d1d465 1205
borlanic 0:02dd72d1d465 1206 mbedtls_pem_free( &pem );
borlanic 0:02dd72d1d465 1207 return( ret );
borlanic 0:02dd72d1d465 1208 }
borlanic 0:02dd72d1d465 1209 else if( ret == MBEDTLS_ERR_PEM_PASSWORD_MISMATCH )
borlanic 0:02dd72d1d465 1210 return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
borlanic 0:02dd72d1d465 1211 else if( ret == MBEDTLS_ERR_PEM_PASSWORD_REQUIRED )
borlanic 0:02dd72d1d465 1212 return( MBEDTLS_ERR_PK_PASSWORD_REQUIRED );
borlanic 0:02dd72d1d465 1213 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
borlanic 0:02dd72d1d465 1214 return( ret );
borlanic 0:02dd72d1d465 1215 #endif /* MBEDTLS_ECP_C */
borlanic 0:02dd72d1d465 1216
borlanic 0:02dd72d1d465 1217 /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
borlanic 0:02dd72d1d465 1218 if( keylen == 0 || key[keylen - 1] != '\0' )
borlanic 0:02dd72d1d465 1219 ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
borlanic 0:02dd72d1d465 1220 else
borlanic 0:02dd72d1d465 1221 ret = mbedtls_pem_read_buffer( &pem,
borlanic 0:02dd72d1d465 1222 "-----BEGIN PRIVATE KEY-----",
borlanic 0:02dd72d1d465 1223 "-----END PRIVATE KEY-----",
borlanic 0:02dd72d1d465 1224 key, NULL, 0, &len );
borlanic 0:02dd72d1d465 1225 if( ret == 0 )
borlanic 0:02dd72d1d465 1226 {
borlanic 0:02dd72d1d465 1227 if( ( ret = pk_parse_key_pkcs8_unencrypted_der( pk,
borlanic 0:02dd72d1d465 1228 pem.buf, pem.buflen ) ) != 0 )
borlanic 0:02dd72d1d465 1229 {
borlanic 0:02dd72d1d465 1230 mbedtls_pk_free( pk );
borlanic 0:02dd72d1d465 1231 }
borlanic 0:02dd72d1d465 1232
borlanic 0:02dd72d1d465 1233 mbedtls_pem_free( &pem );
borlanic 0:02dd72d1d465 1234 return( ret );
borlanic 0:02dd72d1d465 1235 }
borlanic 0:02dd72d1d465 1236 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
borlanic 0:02dd72d1d465 1237 return( ret );
borlanic 0:02dd72d1d465 1238
borlanic 0:02dd72d1d465 1239 #if defined(MBEDTLS_PKCS12_C) || defined(MBEDTLS_PKCS5_C)
borlanic 0:02dd72d1d465 1240 /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
borlanic 0:02dd72d1d465 1241 if( keylen == 0 || key[keylen - 1] != '\0' )
borlanic 0:02dd72d1d465 1242 ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
borlanic 0:02dd72d1d465 1243 else
borlanic 0:02dd72d1d465 1244 ret = mbedtls_pem_read_buffer( &pem,
borlanic 0:02dd72d1d465 1245 "-----BEGIN ENCRYPTED PRIVATE KEY-----",
borlanic 0:02dd72d1d465 1246 "-----END ENCRYPTED PRIVATE KEY-----",
borlanic 0:02dd72d1d465 1247 key, NULL, 0, &len );
borlanic 0:02dd72d1d465 1248 if( ret == 0 )
borlanic 0:02dd72d1d465 1249 {
borlanic 0:02dd72d1d465 1250 if( ( ret = pk_parse_key_pkcs8_encrypted_der( pk,
borlanic 0:02dd72d1d465 1251 pem.buf, pem.buflen,
borlanic 0:02dd72d1d465 1252 pwd, pwdlen ) ) != 0 )
borlanic 0:02dd72d1d465 1253 {
borlanic 0:02dd72d1d465 1254 mbedtls_pk_free( pk );
borlanic 0:02dd72d1d465 1255 }
borlanic 0:02dd72d1d465 1256
borlanic 0:02dd72d1d465 1257 mbedtls_pem_free( &pem );
borlanic 0:02dd72d1d465 1258 return( ret );
borlanic 0:02dd72d1d465 1259 }
borlanic 0:02dd72d1d465 1260 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
borlanic 0:02dd72d1d465 1261 return( ret );
borlanic 0:02dd72d1d465 1262 #endif /* MBEDTLS_PKCS12_C || MBEDTLS_PKCS5_C */
borlanic 0:02dd72d1d465 1263 #else
borlanic 0:02dd72d1d465 1264 ((void) ret);
borlanic 0:02dd72d1d465 1265 ((void) pwd);
borlanic 0:02dd72d1d465 1266 ((void) pwdlen);
borlanic 0:02dd72d1d465 1267 #endif /* MBEDTLS_PEM_PARSE_C */
borlanic 0:02dd72d1d465 1268
borlanic 0:02dd72d1d465 1269 /*
borlanic 0:02dd72d1d465 1270 * At this point we only know it's not a PEM formatted key. Could be any
borlanic 0:02dd72d1d465 1271 * of the known DER encoded private key formats
borlanic 0:02dd72d1d465 1272 *
borlanic 0:02dd72d1d465 1273 * We try the different DER format parsers to see if one passes without
borlanic 0:02dd72d1d465 1274 * error
borlanic 0:02dd72d1d465 1275 */
borlanic 0:02dd72d1d465 1276 #if defined(MBEDTLS_PKCS12_C) || defined(MBEDTLS_PKCS5_C)
borlanic 0:02dd72d1d465 1277 {
borlanic 0:02dd72d1d465 1278 unsigned char *key_copy;
borlanic 0:02dd72d1d465 1279
borlanic 0:02dd72d1d465 1280 if( ( key_copy = mbedtls_calloc( 1, keylen ) ) == NULL )
borlanic 0:02dd72d1d465 1281 return( MBEDTLS_ERR_PK_ALLOC_FAILED );
borlanic 0:02dd72d1d465 1282
borlanic 0:02dd72d1d465 1283 memcpy( key_copy, key, keylen );
borlanic 0:02dd72d1d465 1284
borlanic 0:02dd72d1d465 1285 ret = pk_parse_key_pkcs8_encrypted_der( pk, key_copy, keylen,
borlanic 0:02dd72d1d465 1286 pwd, pwdlen );
borlanic 0:02dd72d1d465 1287
borlanic 0:02dd72d1d465 1288 mbedtls_zeroize( key_copy, keylen );
borlanic 0:02dd72d1d465 1289 mbedtls_free( key_copy );
borlanic 0:02dd72d1d465 1290 }
borlanic 0:02dd72d1d465 1291
borlanic 0:02dd72d1d465 1292 if( ret == 0 )
borlanic 0:02dd72d1d465 1293 return( 0 );
borlanic 0:02dd72d1d465 1294
borlanic 0:02dd72d1d465 1295 mbedtls_pk_free( pk );
borlanic 0:02dd72d1d465 1296
borlanic 0:02dd72d1d465 1297 if( ret == MBEDTLS_ERR_PK_PASSWORD_MISMATCH )
borlanic 0:02dd72d1d465 1298 {
borlanic 0:02dd72d1d465 1299 return( ret );
borlanic 0:02dd72d1d465 1300 }
borlanic 0:02dd72d1d465 1301 #endif /* MBEDTLS_PKCS12_C || MBEDTLS_PKCS5_C */
borlanic 0:02dd72d1d465 1302
borlanic 0:02dd72d1d465 1303 if( ( ret = pk_parse_key_pkcs8_unencrypted_der( pk, key, keylen ) ) == 0 )
borlanic 0:02dd72d1d465 1304 return( 0 );
borlanic 0:02dd72d1d465 1305
borlanic 0:02dd72d1d465 1306 mbedtls_pk_free( pk );
borlanic 0:02dd72d1d465 1307
borlanic 0:02dd72d1d465 1308 #if defined(MBEDTLS_RSA_C)
borlanic 0:02dd72d1d465 1309
borlanic 0:02dd72d1d465 1310 pk_info = mbedtls_pk_info_from_type( MBEDTLS_PK_RSA );
borlanic 0:02dd72d1d465 1311 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 ||
borlanic 0:02dd72d1d465 1312 ( ret = pk_parse_key_pkcs1_der( mbedtls_pk_rsa( *pk ),
borlanic 0:02dd72d1d465 1313 key, keylen ) ) != 0 )
borlanic 0:02dd72d1d465 1314 {
borlanic 0:02dd72d1d465 1315 mbedtls_pk_free( pk );
borlanic 0:02dd72d1d465 1316 }
borlanic 0:02dd72d1d465 1317 else
borlanic 0:02dd72d1d465 1318 {
borlanic 0:02dd72d1d465 1319 return( 0 );
borlanic 0:02dd72d1d465 1320 }
borlanic 0:02dd72d1d465 1321
borlanic 0:02dd72d1d465 1322 #endif /* MBEDTLS_RSA_C */
borlanic 0:02dd72d1d465 1323
borlanic 0:02dd72d1d465 1324 #if defined(MBEDTLS_ECP_C)
borlanic 0:02dd72d1d465 1325
borlanic 0:02dd72d1d465 1326 pk_info = mbedtls_pk_info_from_type( MBEDTLS_PK_ECKEY );
borlanic 0:02dd72d1d465 1327 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 ||
borlanic 0:02dd72d1d465 1328 ( ret = pk_parse_key_sec1_der( mbedtls_pk_ec( *pk ),
borlanic 0:02dd72d1d465 1329 key, keylen ) ) != 0 )
borlanic 0:02dd72d1d465 1330 {
borlanic 0:02dd72d1d465 1331 mbedtls_pk_free( pk );
borlanic 0:02dd72d1d465 1332 }
borlanic 0:02dd72d1d465 1333 else
borlanic 0:02dd72d1d465 1334 {
borlanic 0:02dd72d1d465 1335 return( 0 );
borlanic 0:02dd72d1d465 1336 }
borlanic 0:02dd72d1d465 1337
borlanic 0:02dd72d1d465 1338 #endif /* MBEDTLS_ECP_C */
borlanic 0:02dd72d1d465 1339
borlanic 0:02dd72d1d465 1340 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
borlanic 0:02dd72d1d465 1341 }
borlanic 0:02dd72d1d465 1342
borlanic 0:02dd72d1d465 1343 /*
borlanic 0:02dd72d1d465 1344 * Parse a public key
borlanic 0:02dd72d1d465 1345 */
borlanic 0:02dd72d1d465 1346 int mbedtls_pk_parse_public_key( mbedtls_pk_context *ctx,
borlanic 0:02dd72d1d465 1347 const unsigned char *key, size_t keylen )
borlanic 0:02dd72d1d465 1348 {
borlanic 0:02dd72d1d465 1349 int ret;
borlanic 0:02dd72d1d465 1350 unsigned char *p;
borlanic 0:02dd72d1d465 1351 #if defined(MBEDTLS_PEM_PARSE_C)
borlanic 0:02dd72d1d465 1352 size_t len;
borlanic 0:02dd72d1d465 1353 mbedtls_pem_context pem;
borlanic 0:02dd72d1d465 1354
borlanic 0:02dd72d1d465 1355 mbedtls_pem_init( &pem );
borlanic 0:02dd72d1d465 1356
borlanic 0:02dd72d1d465 1357 /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
borlanic 0:02dd72d1d465 1358 if( keylen == 0 || key[keylen - 1] != '\0' )
borlanic 0:02dd72d1d465 1359 ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
borlanic 0:02dd72d1d465 1360 else
borlanic 0:02dd72d1d465 1361 ret = mbedtls_pem_read_buffer( &pem,
borlanic 0:02dd72d1d465 1362 "-----BEGIN PUBLIC KEY-----",
borlanic 0:02dd72d1d465 1363 "-----END PUBLIC KEY-----",
borlanic 0:02dd72d1d465 1364 key, NULL, 0, &len );
borlanic 0:02dd72d1d465 1365
borlanic 0:02dd72d1d465 1366 if( ret == 0 )
borlanic 0:02dd72d1d465 1367 {
borlanic 0:02dd72d1d465 1368 /*
borlanic 0:02dd72d1d465 1369 * Was PEM encoded
borlanic 0:02dd72d1d465 1370 */
borlanic 0:02dd72d1d465 1371 key = pem.buf;
borlanic 0:02dd72d1d465 1372 keylen = pem.buflen;
borlanic 0:02dd72d1d465 1373 }
borlanic 0:02dd72d1d465 1374 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
borlanic 0:02dd72d1d465 1375 {
borlanic 0:02dd72d1d465 1376 mbedtls_pem_free( &pem );
borlanic 0:02dd72d1d465 1377 return( ret );
borlanic 0:02dd72d1d465 1378 }
borlanic 0:02dd72d1d465 1379 #endif /* MBEDTLS_PEM_PARSE_C */
borlanic 0:02dd72d1d465 1380 p = (unsigned char *) key;
borlanic 0:02dd72d1d465 1381
borlanic 0:02dd72d1d465 1382 ret = mbedtls_pk_parse_subpubkey( &p, p + keylen, ctx );
borlanic 0:02dd72d1d465 1383
borlanic 0:02dd72d1d465 1384 #if defined(MBEDTLS_PEM_PARSE_C)
borlanic 0:02dd72d1d465 1385 mbedtls_pem_free( &pem );
borlanic 0:02dd72d1d465 1386 #endif
borlanic 0:02dd72d1d465 1387
borlanic 0:02dd72d1d465 1388 return( ret );
borlanic 0:02dd72d1d465 1389 }
borlanic 0:02dd72d1d465 1390
borlanic 0:02dd72d1d465 1391 #endif /* MBEDTLS_PK_PARSE_C */