EL4121 Embedded System / mbed-os

mbed-os

Dependents:   cobaLCDJoyMotor_Thread odometry_omni_3roda_v3 odometry_omni_3roda_v1 odometry_omni_3roda_v2 ... more

features/mbedtls/src/pkparse.c@0:b74591d5ab33, 2017-12-11 (annotated)

Committer:
be_bryan
Date:
Mon Dec 11 17:54:04 2017 +0000
Revision:
0:b74591d5ab33
motor ++

Who changed what in which revision?

UserRevisionLine numberNew contents of line
be_bryan 0:b74591d5ab33 1 /*
be_bryan 0:b74591d5ab33 2 * Public Key layer for parsing key files and structures
be_bryan 0:b74591d5ab33 3 *
be_bryan 0:b74591d5ab33 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
be_bryan 0:b74591d5ab33 5 * SPDX-License-Identifier: Apache-2.0
be_bryan 0:b74591d5ab33 6 *
be_bryan 0:b74591d5ab33 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
be_bryan 0:b74591d5ab33 8 * not use this file except in compliance with the License.
be_bryan 0:b74591d5ab33 9 * You may obtain a copy of the License at
be_bryan 0:b74591d5ab33 10 *
be_bryan 0:b74591d5ab33 11 * http://www.apache.org/licenses/LICENSE-2.0
be_bryan 0:b74591d5ab33 12 *
be_bryan 0:b74591d5ab33 13 * Unless required by applicable law or agreed to in writing, software
be_bryan 0:b74591d5ab33 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
be_bryan 0:b74591d5ab33 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
be_bryan 0:b74591d5ab33 16 * See the License for the specific language governing permissions and
be_bryan 0:b74591d5ab33 17 * limitations under the License.
be_bryan 0:b74591d5ab33 18 *
be_bryan 0:b74591d5ab33 19 * This file is part of mbed TLS (https://tls.mbed.org)
be_bryan 0:b74591d5ab33 20 */
be_bryan 0:b74591d5ab33 21
be_bryan 0:b74591d5ab33 22 #if !defined(MBEDTLS_CONFIG_FILE)
be_bryan 0:b74591d5ab33 23 #include "mbedtls/config.h"
be_bryan 0:b74591d5ab33 24 #else
be_bryan 0:b74591d5ab33 25 #include MBEDTLS_CONFIG_FILE
be_bryan 0:b74591d5ab33 26 #endif
be_bryan 0:b74591d5ab33 27
be_bryan 0:b74591d5ab33 28 #if defined(MBEDTLS_PK_PARSE_C)
be_bryan 0:b74591d5ab33 29
be_bryan 0:b74591d5ab33 30 #include "mbedtls/pk.h"
be_bryan 0:b74591d5ab33 31 #include "mbedtls/asn1.h"
be_bryan 0:b74591d5ab33 32 #include "mbedtls/oid.h"
be_bryan 0:b74591d5ab33 33
be_bryan 0:b74591d5ab33 34 #include <string.h>
be_bryan 0:b74591d5ab33 35
be_bryan 0:b74591d5ab33 36 #if defined(MBEDTLS_RSA_C)
be_bryan 0:b74591d5ab33 37 #include "mbedtls/rsa.h"
be_bryan 0:b74591d5ab33 38 #endif
be_bryan 0:b74591d5ab33 39 #if defined(MBEDTLS_ECP_C)
be_bryan 0:b74591d5ab33 40 #include "mbedtls/ecp.h"
be_bryan 0:b74591d5ab33 41 #endif
be_bryan 0:b74591d5ab33 42 #if defined(MBEDTLS_ECDSA_C)
be_bryan 0:b74591d5ab33 43 #include "mbedtls/ecdsa.h"
be_bryan 0:b74591d5ab33 44 #endif
be_bryan 0:b74591d5ab33 45 #if defined(MBEDTLS_PEM_PARSE_C)
be_bryan 0:b74591d5ab33 46 #include "mbedtls/pem.h"
be_bryan 0:b74591d5ab33 47 #endif
be_bryan 0:b74591d5ab33 48 #if defined(MBEDTLS_PKCS5_C)
be_bryan 0:b74591d5ab33 49 #include "mbedtls/pkcs5.h"
be_bryan 0:b74591d5ab33 50 #endif
be_bryan 0:b74591d5ab33 51 #if defined(MBEDTLS_PKCS12_C)
be_bryan 0:b74591d5ab33 52 #include "mbedtls/pkcs12.h"
be_bryan 0:b74591d5ab33 53 #endif
be_bryan 0:b74591d5ab33 54
be_bryan 0:b74591d5ab33 55 #if defined(MBEDTLS_PLATFORM_C)
be_bryan 0:b74591d5ab33 56 #include "mbedtls/platform.h"
be_bryan 0:b74591d5ab33 57 #else
be_bryan 0:b74591d5ab33 58 #include <stdlib.h>
be_bryan 0:b74591d5ab33 59 #define mbedtls_calloc calloc
be_bryan 0:b74591d5ab33 60 #define mbedtls_free free
be_bryan 0:b74591d5ab33 61 #endif
be_bryan 0:b74591d5ab33 62
be_bryan 0:b74591d5ab33 63 #if defined(MBEDTLS_FS_IO)
be_bryan 0:b74591d5ab33 64 /* Implementation that should never be optimized out by the compiler */
be_bryan 0:b74591d5ab33 65 static void mbedtls_zeroize( void *v, size_t n ) {
be_bryan 0:b74591d5ab33 66 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
be_bryan 0:b74591d5ab33 67 }
be_bryan 0:b74591d5ab33 68
be_bryan 0:b74591d5ab33 69 /*
be_bryan 0:b74591d5ab33 70 * Load all data from a file into a given buffer.
be_bryan 0:b74591d5ab33 71 *
be_bryan 0:b74591d5ab33 72 * The file is expected to contain either PEM or DER encoded data.
be_bryan 0:b74591d5ab33 73 * A terminating null byte is always appended. It is included in the announced
be_bryan 0:b74591d5ab33 74 * length only if the data looks like it is PEM encoded.
be_bryan 0:b74591d5ab33 75 */
be_bryan 0:b74591d5ab33 76 int mbedtls_pk_load_file( const char *path, unsigned char **buf, size_t *n )
be_bryan 0:b74591d5ab33 77 {
be_bryan 0:b74591d5ab33 78 FILE *f;
be_bryan 0:b74591d5ab33 79 long size;
be_bryan 0:b74591d5ab33 80
be_bryan 0:b74591d5ab33 81 if( ( f = fopen( path, "rb" ) ) == NULL )
be_bryan 0:b74591d5ab33 82 return( MBEDTLS_ERR_PK_FILE_IO_ERROR );
be_bryan 0:b74591d5ab33 83
be_bryan 0:b74591d5ab33 84 fseek( f, 0, SEEK_END );
be_bryan 0:b74591d5ab33 85 if( ( size = ftell( f ) ) == -1 )
be_bryan 0:b74591d5ab33 86 {
be_bryan 0:b74591d5ab33 87 fclose( f );
be_bryan 0:b74591d5ab33 88 return( MBEDTLS_ERR_PK_FILE_IO_ERROR );
be_bryan 0:b74591d5ab33 89 }
be_bryan 0:b74591d5ab33 90 fseek( f, 0, SEEK_SET );
be_bryan 0:b74591d5ab33 91
be_bryan 0:b74591d5ab33 92 *n = (size_t) size;
be_bryan 0:b74591d5ab33 93
be_bryan 0:b74591d5ab33 94 if( *n + 1 == 0 ||
be_bryan 0:b74591d5ab33 95 ( *buf = mbedtls_calloc( 1, *n + 1 ) ) == NULL )
be_bryan 0:b74591d5ab33 96 {
be_bryan 0:b74591d5ab33 97 fclose( f );
be_bryan 0:b74591d5ab33 98 return( MBEDTLS_ERR_PK_ALLOC_FAILED );
be_bryan 0:b74591d5ab33 99 }
be_bryan 0:b74591d5ab33 100
be_bryan 0:b74591d5ab33 101 if( fread( *buf, 1, *n, f ) != *n )
be_bryan 0:b74591d5ab33 102 {
be_bryan 0:b74591d5ab33 103 fclose( f );
be_bryan 0:b74591d5ab33 104 mbedtls_free( *buf );
be_bryan 0:b74591d5ab33 105 return( MBEDTLS_ERR_PK_FILE_IO_ERROR );
be_bryan 0:b74591d5ab33 106 }
be_bryan 0:b74591d5ab33 107
be_bryan 0:b74591d5ab33 108 fclose( f );
be_bryan 0:b74591d5ab33 109
be_bryan 0:b74591d5ab33 110 (*buf)[*n] = '\0';
be_bryan 0:b74591d5ab33 111
be_bryan 0:b74591d5ab33 112 if( strstr( (const char *) *buf, "-----BEGIN " ) != NULL )
be_bryan 0:b74591d5ab33 113 ++*n;
be_bryan 0:b74591d5ab33 114
be_bryan 0:b74591d5ab33 115 return( 0 );
be_bryan 0:b74591d5ab33 116 }
be_bryan 0:b74591d5ab33 117
be_bryan 0:b74591d5ab33 118 /*
be_bryan 0:b74591d5ab33 119 * Load and parse a private key
be_bryan 0:b74591d5ab33 120 */
be_bryan 0:b74591d5ab33 121 int mbedtls_pk_parse_keyfile( mbedtls_pk_context *ctx,
be_bryan 0:b74591d5ab33 122 const char *path, const char *pwd )
be_bryan 0:b74591d5ab33 123 {
be_bryan 0:b74591d5ab33 124 int ret;
be_bryan 0:b74591d5ab33 125 size_t n;
be_bryan 0:b74591d5ab33 126 unsigned char *buf;
be_bryan 0:b74591d5ab33 127
be_bryan 0:b74591d5ab33 128 if( ( ret = mbedtls_pk_load_file( path, &buf, &n ) ) != 0 )
be_bryan 0:b74591d5ab33 129 return( ret );
be_bryan 0:b74591d5ab33 130
be_bryan 0:b74591d5ab33 131 if( pwd == NULL )
be_bryan 0:b74591d5ab33 132 ret = mbedtls_pk_parse_key( ctx, buf, n, NULL, 0 );
be_bryan 0:b74591d5ab33 133 else
be_bryan 0:b74591d5ab33 134 ret = mbedtls_pk_parse_key( ctx, buf, n,
be_bryan 0:b74591d5ab33 135 (const unsigned char *) pwd, strlen( pwd ) );
be_bryan 0:b74591d5ab33 136
be_bryan 0:b74591d5ab33 137 mbedtls_zeroize( buf, n );
be_bryan 0:b74591d5ab33 138 mbedtls_free( buf );
be_bryan 0:b74591d5ab33 139
be_bryan 0:b74591d5ab33 140 return( ret );
be_bryan 0:b74591d5ab33 141 }
be_bryan 0:b74591d5ab33 142
be_bryan 0:b74591d5ab33 143 /*
be_bryan 0:b74591d5ab33 144 * Load and parse a public key
be_bryan 0:b74591d5ab33 145 */
be_bryan 0:b74591d5ab33 146 int mbedtls_pk_parse_public_keyfile( mbedtls_pk_context *ctx, const char *path )
be_bryan 0:b74591d5ab33 147 {
be_bryan 0:b74591d5ab33 148 int ret;
be_bryan 0:b74591d5ab33 149 size_t n;
be_bryan 0:b74591d5ab33 150 unsigned char *buf;
be_bryan 0:b74591d5ab33 151
be_bryan 0:b74591d5ab33 152 if( ( ret = mbedtls_pk_load_file( path, &buf, &n ) ) != 0 )
be_bryan 0:b74591d5ab33 153 return( ret );
be_bryan 0:b74591d5ab33 154
be_bryan 0:b74591d5ab33 155 ret = mbedtls_pk_parse_public_key( ctx, buf, n );
be_bryan 0:b74591d5ab33 156
be_bryan 0:b74591d5ab33 157 mbedtls_zeroize( buf, n );
be_bryan 0:b74591d5ab33 158 mbedtls_free( buf );
be_bryan 0:b74591d5ab33 159
be_bryan 0:b74591d5ab33 160 return( ret );
be_bryan 0:b74591d5ab33 161 }
be_bryan 0:b74591d5ab33 162 #endif /* MBEDTLS_FS_IO */
be_bryan 0:b74591d5ab33 163
be_bryan 0:b74591d5ab33 164 #if defined(MBEDTLS_ECP_C)
be_bryan 0:b74591d5ab33 165 /* Minimally parse an ECParameters buffer to and mbedtls_asn1_buf
be_bryan 0:b74591d5ab33 166 *
be_bryan 0:b74591d5ab33 167 * ECParameters ::= CHOICE {
be_bryan 0:b74591d5ab33 168 * namedCurve OBJECT IDENTIFIER
be_bryan 0:b74591d5ab33 169 * specifiedCurve SpecifiedECDomain -- = SEQUENCE { ... }
be_bryan 0:b74591d5ab33 170 * -- implicitCurve NULL
be_bryan 0:b74591d5ab33 171 * }
be_bryan 0:b74591d5ab33 172 */
be_bryan 0:b74591d5ab33 173 static int pk_get_ecparams( unsigned char **p, const unsigned char *end,
be_bryan 0:b74591d5ab33 174 mbedtls_asn1_buf *params )
be_bryan 0:b74591d5ab33 175 {
be_bryan 0:b74591d5ab33 176 int ret;
be_bryan 0:b74591d5ab33 177
be_bryan 0:b74591d5ab33 178 /* Tag may be either OID or SEQUENCE */
be_bryan 0:b74591d5ab33 179 params->tag = **p;
be_bryan 0:b74591d5ab33 180 if( params->tag != MBEDTLS_ASN1_OID
be_bryan 0:b74591d5ab33 181 #if defined(MBEDTLS_PK_PARSE_EC_EXTENDED)
be_bryan 0:b74591d5ab33 182 && params->tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE )
be_bryan 0:b74591d5ab33 183 #endif
be_bryan 0:b74591d5ab33 184 )
be_bryan 0:b74591d5ab33 185 {
be_bryan 0:b74591d5ab33 186 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
be_bryan 0:b74591d5ab33 187 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
be_bryan 0:b74591d5ab33 188 }
be_bryan 0:b74591d5ab33 189
be_bryan 0:b74591d5ab33 190 if( ( ret = mbedtls_asn1_get_tag( p, end, &params->len, params->tag ) ) != 0 )
be_bryan 0:b74591d5ab33 191 {
be_bryan 0:b74591d5ab33 192 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
be_bryan 0:b74591d5ab33 193 }
be_bryan 0:b74591d5ab33 194
be_bryan 0:b74591d5ab33 195 params->p = *p;
be_bryan 0:b74591d5ab33 196 *p += params->len;
be_bryan 0:b74591d5ab33 197
be_bryan 0:b74591d5ab33 198 if( *p != end )
be_bryan 0:b74591d5ab33 199 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
be_bryan 0:b74591d5ab33 200 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
be_bryan 0:b74591d5ab33 201
be_bryan 0:b74591d5ab33 202 return( 0 );
be_bryan 0:b74591d5ab33 203 }
be_bryan 0:b74591d5ab33 204
be_bryan 0:b74591d5ab33 205 #if defined(MBEDTLS_PK_PARSE_EC_EXTENDED)
be_bryan 0:b74591d5ab33 206 /*
be_bryan 0:b74591d5ab33 207 * Parse a SpecifiedECDomain (SEC 1 C.2) and (mostly) fill the group with it.
be_bryan 0:b74591d5ab33 208 * WARNING: the resulting group should only be used with
be_bryan 0:b74591d5ab33 209 * pk_group_id_from_specified(), since its base point may not be set correctly
be_bryan 0:b74591d5ab33 210 * if it was encoded compressed.
be_bryan 0:b74591d5ab33 211 *
be_bryan 0:b74591d5ab33 212 * SpecifiedECDomain ::= SEQUENCE {
be_bryan 0:b74591d5ab33 213 * version SpecifiedECDomainVersion(ecdpVer1 | ecdpVer2 | ecdpVer3, ...),
be_bryan 0:b74591d5ab33 214 * fieldID FieldID {{FieldTypes}},
be_bryan 0:b74591d5ab33 215 * curve Curve,
be_bryan 0:b74591d5ab33 216 * base ECPoint,
be_bryan 0:b74591d5ab33 217 * order INTEGER,
be_bryan 0:b74591d5ab33 218 * cofactor INTEGER OPTIONAL,
be_bryan 0:b74591d5ab33 219 * hash HashAlgorithm OPTIONAL,
be_bryan 0:b74591d5ab33 220 * ...
be_bryan 0:b74591d5ab33 221 * }
be_bryan 0:b74591d5ab33 222 *
be_bryan 0:b74591d5ab33 223 * We only support prime-field as field type, and ignore hash and cofactor.
be_bryan 0:b74591d5ab33 224 */
be_bryan 0:b74591d5ab33 225 static int pk_group_from_specified( const mbedtls_asn1_buf *params, mbedtls_ecp_group *grp )
be_bryan 0:b74591d5ab33 226 {
be_bryan 0:b74591d5ab33 227 int ret;
be_bryan 0:b74591d5ab33 228 unsigned char *p = params->p;
be_bryan 0:b74591d5ab33 229 const unsigned char * const end = params->p + params->len;
be_bryan 0:b74591d5ab33 230 const unsigned char *end_field, *end_curve;
be_bryan 0:b74591d5ab33 231 size_t len;
be_bryan 0:b74591d5ab33 232 int ver;
be_bryan 0:b74591d5ab33 233
be_bryan 0:b74591d5ab33 234 /* SpecifiedECDomainVersion ::= INTEGER { 1, 2, 3 } */
be_bryan 0:b74591d5ab33 235 if( ( ret = mbedtls_asn1_get_int( &p, end, &ver ) ) != 0 )
be_bryan 0:b74591d5ab33 236 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
be_bryan 0:b74591d5ab33 237
be_bryan 0:b74591d5ab33 238 if( ver < 1 || ver > 3 )
be_bryan 0:b74591d5ab33 239 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
be_bryan 0:b74591d5ab33 240
be_bryan 0:b74591d5ab33 241 /*
be_bryan 0:b74591d5ab33 242 * FieldID { FIELD-ID:IOSet } ::= SEQUENCE { -- Finite field
be_bryan 0:b74591d5ab33 243 * fieldType FIELD-ID.&id({IOSet}),
be_bryan 0:b74591d5ab33 244 * parameters FIELD-ID.&Type({IOSet}{@fieldType})
be_bryan 0:b74591d5ab33 245 * }
be_bryan 0:b74591d5ab33 246 */
be_bryan 0:b74591d5ab33 247 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
be_bryan 0:b74591d5ab33 248 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
be_bryan 0:b74591d5ab33 249 return( ret );
be_bryan 0:b74591d5ab33 250
be_bryan 0:b74591d5ab33 251 end_field = p + len;
be_bryan 0:b74591d5ab33 252
be_bryan 0:b74591d5ab33 253 /*
be_bryan 0:b74591d5ab33 254 * FIELD-ID ::= TYPE-IDENTIFIER
be_bryan 0:b74591d5ab33 255 * FieldTypes FIELD-ID ::= {
be_bryan 0:b74591d5ab33 256 * { Prime-p IDENTIFIED BY prime-field } |
be_bryan 0:b74591d5ab33 257 * { Characteristic-two IDENTIFIED BY characteristic-two-field }
be_bryan 0:b74591d5ab33 258 * }
be_bryan 0:b74591d5ab33 259 * prime-field OBJECT IDENTIFIER ::= { id-fieldType 1 }
be_bryan 0:b74591d5ab33 260 */
be_bryan 0:b74591d5ab33 261 if( ( ret = mbedtls_asn1_get_tag( &p, end_field, &len, MBEDTLS_ASN1_OID ) ) != 0 )
be_bryan 0:b74591d5ab33 262 return( ret );
be_bryan 0:b74591d5ab33 263
be_bryan 0:b74591d5ab33 264 if( len != MBEDTLS_OID_SIZE( MBEDTLS_OID_ANSI_X9_62_PRIME_FIELD ) ||
be_bryan 0:b74591d5ab33 265 memcmp( p, MBEDTLS_OID_ANSI_X9_62_PRIME_FIELD, len ) != 0 )
be_bryan 0:b74591d5ab33 266 {
be_bryan 0:b74591d5ab33 267 return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
be_bryan 0:b74591d5ab33 268 }
be_bryan 0:b74591d5ab33 269
be_bryan 0:b74591d5ab33 270 p += len;
be_bryan 0:b74591d5ab33 271
be_bryan 0:b74591d5ab33 272 /* Prime-p ::= INTEGER -- Field of size p. */
be_bryan 0:b74591d5ab33 273 if( ( ret = mbedtls_asn1_get_mpi( &p, end_field, &grp->P ) ) != 0 )
be_bryan 0:b74591d5ab33 274 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
be_bryan 0:b74591d5ab33 275
be_bryan 0:b74591d5ab33 276 grp->pbits = mbedtls_mpi_bitlen( &grp->P );
be_bryan 0:b74591d5ab33 277
be_bryan 0:b74591d5ab33 278 if( p != end_field )
be_bryan 0:b74591d5ab33 279 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
be_bryan 0:b74591d5ab33 280 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
be_bryan 0:b74591d5ab33 281
be_bryan 0:b74591d5ab33 282 /*
be_bryan 0:b74591d5ab33 283 * Curve ::= SEQUENCE {
be_bryan 0:b74591d5ab33 284 * a FieldElement,
be_bryan 0:b74591d5ab33 285 * b FieldElement,
be_bryan 0:b74591d5ab33 286 * seed BIT STRING OPTIONAL
be_bryan 0:b74591d5ab33 287 * -- Shall be present if used in SpecifiedECDomain
be_bryan 0:b74591d5ab33 288 * -- with version equal to ecdpVer2 or ecdpVer3
be_bryan 0:b74591d5ab33 289 * }
be_bryan 0:b74591d5ab33 290 */
be_bryan 0:b74591d5ab33 291 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
be_bryan 0:b74591d5ab33 292 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
be_bryan 0:b74591d5ab33 293 return( ret );
be_bryan 0:b74591d5ab33 294
be_bryan 0:b74591d5ab33 295 end_curve = p + len;
be_bryan 0:b74591d5ab33 296
be_bryan 0:b74591d5ab33 297 /*
be_bryan 0:b74591d5ab33 298 * FieldElement ::= OCTET STRING
be_bryan 0:b74591d5ab33 299 * containing an integer in the case of a prime field
be_bryan 0:b74591d5ab33 300 */
be_bryan 0:b74591d5ab33 301 if( ( ret = mbedtls_asn1_get_tag( &p, end_curve, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 ||
be_bryan 0:b74591d5ab33 302 ( ret = mbedtls_mpi_read_binary( &grp->A, p, len ) ) != 0 )
be_bryan 0:b74591d5ab33 303 {
be_bryan 0:b74591d5ab33 304 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
be_bryan 0:b74591d5ab33 305 }
be_bryan 0:b74591d5ab33 306
be_bryan 0:b74591d5ab33 307 p += len;
be_bryan 0:b74591d5ab33 308
be_bryan 0:b74591d5ab33 309 if( ( ret = mbedtls_asn1_get_tag( &p, end_curve, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 ||
be_bryan 0:b74591d5ab33 310 ( ret = mbedtls_mpi_read_binary( &grp->B, p, len ) ) != 0 )
be_bryan 0:b74591d5ab33 311 {
be_bryan 0:b74591d5ab33 312 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
be_bryan 0:b74591d5ab33 313 }
be_bryan 0:b74591d5ab33 314
be_bryan 0:b74591d5ab33 315 p += len;
be_bryan 0:b74591d5ab33 316
be_bryan 0:b74591d5ab33 317 /* Ignore seed BIT STRING OPTIONAL */
be_bryan 0:b74591d5ab33 318 if( ( ret = mbedtls_asn1_get_tag( &p, end_curve, &len, MBEDTLS_ASN1_BIT_STRING ) ) == 0 )
be_bryan 0:b74591d5ab33 319 p += len;
be_bryan 0:b74591d5ab33 320
be_bryan 0:b74591d5ab33 321 if( p != end_curve )
be_bryan 0:b74591d5ab33 322 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
be_bryan 0:b74591d5ab33 323 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
be_bryan 0:b74591d5ab33 324
be_bryan 0:b74591d5ab33 325 /*
be_bryan 0:b74591d5ab33 326 * ECPoint ::= OCTET STRING
be_bryan 0:b74591d5ab33 327 */
be_bryan 0:b74591d5ab33 328 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
be_bryan 0:b74591d5ab33 329 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
be_bryan 0:b74591d5ab33 330
be_bryan 0:b74591d5ab33 331 if( ( ret = mbedtls_ecp_point_read_binary( grp, &grp->G,
be_bryan 0:b74591d5ab33 332 ( const unsigned char *) p, len ) ) != 0 )
be_bryan 0:b74591d5ab33 333 {
be_bryan 0:b74591d5ab33 334 /*
be_bryan 0:b74591d5ab33 335 * If we can't read the point because it's compressed, cheat by
be_bryan 0:b74591d5ab33 336 * reading only the X coordinate and the parity bit of Y.
be_bryan 0:b74591d5ab33 337 */
be_bryan 0:b74591d5ab33 338 if( ret != MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE ||
be_bryan 0:b74591d5ab33 339 ( p[0] != 0x02 && p[0] != 0x03 ) ||
be_bryan 0:b74591d5ab33 340 len != mbedtls_mpi_size( &grp->P ) + 1 ||
be_bryan 0:b74591d5ab33 341 mbedtls_mpi_read_binary( &grp->G.X, p + 1, len - 1 ) != 0 ||
be_bryan 0:b74591d5ab33 342 mbedtls_mpi_lset( &grp->G.Y, p[0] - 2 ) != 0 ||
be_bryan 0:b74591d5ab33 343 mbedtls_mpi_lset( &grp->G.Z, 1 ) != 0 )
be_bryan 0:b74591d5ab33 344 {
be_bryan 0:b74591d5ab33 345 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
be_bryan 0:b74591d5ab33 346 }
be_bryan 0:b74591d5ab33 347 }
be_bryan 0:b74591d5ab33 348
be_bryan 0:b74591d5ab33 349 p += len;
be_bryan 0:b74591d5ab33 350
be_bryan 0:b74591d5ab33 351 /*
be_bryan 0:b74591d5ab33 352 * order INTEGER
be_bryan 0:b74591d5ab33 353 */
be_bryan 0:b74591d5ab33 354 if( ( ret = mbedtls_asn1_get_mpi( &p, end, &grp->N ) ) != 0 )
be_bryan 0:b74591d5ab33 355 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
be_bryan 0:b74591d5ab33 356
be_bryan 0:b74591d5ab33 357 grp->nbits = mbedtls_mpi_bitlen( &grp->N );
be_bryan 0:b74591d5ab33 358
be_bryan 0:b74591d5ab33 359 /*
be_bryan 0:b74591d5ab33 360 * Allow optional elements by purposefully not enforcing p == end here.
be_bryan 0:b74591d5ab33 361 */
be_bryan 0:b74591d5ab33 362
be_bryan 0:b74591d5ab33 363 return( 0 );
be_bryan 0:b74591d5ab33 364 }
be_bryan 0:b74591d5ab33 365
be_bryan 0:b74591d5ab33 366 /*
be_bryan 0:b74591d5ab33 367 * Find the group id associated with an (almost filled) group as generated by
be_bryan 0:b74591d5ab33 368 * pk_group_from_specified(), or return an error if unknown.
be_bryan 0:b74591d5ab33 369 */
be_bryan 0:b74591d5ab33 370 static int pk_group_id_from_group( const mbedtls_ecp_group *grp, mbedtls_ecp_group_id *grp_id )
be_bryan 0:b74591d5ab33 371 {
be_bryan 0:b74591d5ab33 372 int ret = 0;
be_bryan 0:b74591d5ab33 373 mbedtls_ecp_group ref;
be_bryan 0:b74591d5ab33 374 const mbedtls_ecp_group_id *id;
be_bryan 0:b74591d5ab33 375
be_bryan 0:b74591d5ab33 376 mbedtls_ecp_group_init( &ref );
be_bryan 0:b74591d5ab33 377
be_bryan 0:b74591d5ab33 378 for( id = mbedtls_ecp_grp_id_list(); *id != MBEDTLS_ECP_DP_NONE; id++ )
be_bryan 0:b74591d5ab33 379 {
be_bryan 0:b74591d5ab33 380 /* Load the group associated to that id */
be_bryan 0:b74591d5ab33 381 mbedtls_ecp_group_free( &ref );
be_bryan 0:b74591d5ab33 382 MBEDTLS_MPI_CHK( mbedtls_ecp_group_load( &ref, *id ) );
be_bryan 0:b74591d5ab33 383
be_bryan 0:b74591d5ab33 384 /* Compare to the group we were given, starting with easy tests */
be_bryan 0:b74591d5ab33 385 if( grp->pbits == ref.pbits && grp->nbits == ref.nbits &&
be_bryan 0:b74591d5ab33 386 mbedtls_mpi_cmp_mpi( &grp->P, &ref.P ) == 0 &&
be_bryan 0:b74591d5ab33 387 mbedtls_mpi_cmp_mpi( &grp->A, &ref.A ) == 0 &&
be_bryan 0:b74591d5ab33 388 mbedtls_mpi_cmp_mpi( &grp->B, &ref.B ) == 0 &&
be_bryan 0:b74591d5ab33 389 mbedtls_mpi_cmp_mpi( &grp->N, &ref.N ) == 0 &&
be_bryan 0:b74591d5ab33 390 mbedtls_mpi_cmp_mpi( &grp->G.X, &ref.G.X ) == 0 &&
be_bryan 0:b74591d5ab33 391 mbedtls_mpi_cmp_mpi( &grp->G.Z, &ref.G.Z ) == 0 &&
be_bryan 0:b74591d5ab33 392 /* For Y we may only know the parity bit, so compare only that */
be_bryan 0:b74591d5ab33 393 mbedtls_mpi_get_bit( &grp->G.Y, 0 ) == mbedtls_mpi_get_bit( &ref.G.Y, 0 ) )
be_bryan 0:b74591d5ab33 394 {
be_bryan 0:b74591d5ab33 395 break;
be_bryan 0:b74591d5ab33 396 }
be_bryan 0:b74591d5ab33 397
be_bryan 0:b74591d5ab33 398 }
be_bryan 0:b74591d5ab33 399
be_bryan 0:b74591d5ab33 400 cleanup:
be_bryan 0:b74591d5ab33 401 mbedtls_ecp_group_free( &ref );
be_bryan 0:b74591d5ab33 402
be_bryan 0:b74591d5ab33 403 *grp_id = *id;
be_bryan 0:b74591d5ab33 404
be_bryan 0:b74591d5ab33 405 if( ret == 0 && *id == MBEDTLS_ECP_DP_NONE )
be_bryan 0:b74591d5ab33 406 ret = MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE;
be_bryan 0:b74591d5ab33 407
be_bryan 0:b74591d5ab33 408 return( ret );
be_bryan 0:b74591d5ab33 409 }
be_bryan 0:b74591d5ab33 410
be_bryan 0:b74591d5ab33 411 /*
be_bryan 0:b74591d5ab33 412 * Parse a SpecifiedECDomain (SEC 1 C.2) and find the associated group ID
be_bryan 0:b74591d5ab33 413 */
be_bryan 0:b74591d5ab33 414 static int pk_group_id_from_specified( const mbedtls_asn1_buf *params,
be_bryan 0:b74591d5ab33 415 mbedtls_ecp_group_id *grp_id )
be_bryan 0:b74591d5ab33 416 {
be_bryan 0:b74591d5ab33 417 int ret;
be_bryan 0:b74591d5ab33 418 mbedtls_ecp_group grp;
be_bryan 0:b74591d5ab33 419
be_bryan 0:b74591d5ab33 420 mbedtls_ecp_group_init( &grp );
be_bryan 0:b74591d5ab33 421
be_bryan 0:b74591d5ab33 422 if( ( ret = pk_group_from_specified( params, &grp ) ) != 0 )
be_bryan 0:b74591d5ab33 423 goto cleanup;
be_bryan 0:b74591d5ab33 424
be_bryan 0:b74591d5ab33 425 ret = pk_group_id_from_group( &grp, grp_id );
be_bryan 0:b74591d5ab33 426
be_bryan 0:b74591d5ab33 427 cleanup:
be_bryan 0:b74591d5ab33 428 mbedtls_ecp_group_free( &grp );
be_bryan 0:b74591d5ab33 429
be_bryan 0:b74591d5ab33 430 return( ret );
be_bryan 0:b74591d5ab33 431 }
be_bryan 0:b74591d5ab33 432 #endif /* MBEDTLS_PK_PARSE_EC_EXTENDED */
be_bryan 0:b74591d5ab33 433
be_bryan 0:b74591d5ab33 434 /*
be_bryan 0:b74591d5ab33 435 * Use EC parameters to initialise an EC group
be_bryan 0:b74591d5ab33 436 *
be_bryan 0:b74591d5ab33 437 * ECParameters ::= CHOICE {
be_bryan 0:b74591d5ab33 438 * namedCurve OBJECT IDENTIFIER
be_bryan 0:b74591d5ab33 439 * specifiedCurve SpecifiedECDomain -- = SEQUENCE { ... }
be_bryan 0:b74591d5ab33 440 * -- implicitCurve NULL
be_bryan 0:b74591d5ab33 441 */
be_bryan 0:b74591d5ab33 442 static int pk_use_ecparams( const mbedtls_asn1_buf *params, mbedtls_ecp_group *grp )
be_bryan 0:b74591d5ab33 443 {
be_bryan 0:b74591d5ab33 444 int ret;
be_bryan 0:b74591d5ab33 445 mbedtls_ecp_group_id grp_id;
be_bryan 0:b74591d5ab33 446
be_bryan 0:b74591d5ab33 447 if( params->tag == MBEDTLS_ASN1_OID )
be_bryan 0:b74591d5ab33 448 {
be_bryan 0:b74591d5ab33 449 if( mbedtls_oid_get_ec_grp( params, &grp_id ) != 0 )
be_bryan 0:b74591d5ab33 450 return( MBEDTLS_ERR_PK_UNKNOWN_NAMED_CURVE );
be_bryan 0:b74591d5ab33 451 }
be_bryan 0:b74591d5ab33 452 else
be_bryan 0:b74591d5ab33 453 {
be_bryan 0:b74591d5ab33 454 #if defined(MBEDTLS_PK_PARSE_EC_EXTENDED)
be_bryan 0:b74591d5ab33 455 if( ( ret = pk_group_id_from_specified( params, &grp_id ) ) != 0 )
be_bryan 0:b74591d5ab33 456 return( ret );
be_bryan 0:b74591d5ab33 457 #else
be_bryan 0:b74591d5ab33 458 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
be_bryan 0:b74591d5ab33 459 #endif
be_bryan 0:b74591d5ab33 460 }
be_bryan 0:b74591d5ab33 461
be_bryan 0:b74591d5ab33 462 /*
be_bryan 0:b74591d5ab33 463 * grp may already be initilialized; if so, make sure IDs match
be_bryan 0:b74591d5ab33 464 */
be_bryan 0:b74591d5ab33 465 if( grp->id != MBEDTLS_ECP_DP_NONE && grp->id != grp_id )
be_bryan 0:b74591d5ab33 466 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
be_bryan 0:b74591d5ab33 467
be_bryan 0:b74591d5ab33 468 if( ( ret = mbedtls_ecp_group_load( grp, grp_id ) ) != 0 )
be_bryan 0:b74591d5ab33 469 return( ret );
be_bryan 0:b74591d5ab33 470
be_bryan 0:b74591d5ab33 471 return( 0 );
be_bryan 0:b74591d5ab33 472 }
be_bryan 0:b74591d5ab33 473
be_bryan 0:b74591d5ab33 474 /*
be_bryan 0:b74591d5ab33 475 * EC public key is an EC point
be_bryan 0:b74591d5ab33 476 *
be_bryan 0:b74591d5ab33 477 * The caller is responsible for clearing the structure upon failure if
be_bryan 0:b74591d5ab33 478 * desired. Take care to pass along the possible ECP_FEATURE_UNAVAILABLE
be_bryan 0:b74591d5ab33 479 * return code of mbedtls_ecp_point_read_binary() and leave p in a usable state.
be_bryan 0:b74591d5ab33 480 */
be_bryan 0:b74591d5ab33 481 static int pk_get_ecpubkey( unsigned char **p, const unsigned char *end,
be_bryan 0:b74591d5ab33 482 mbedtls_ecp_keypair *key )
be_bryan 0:b74591d5ab33 483 {
be_bryan 0:b74591d5ab33 484 int ret;
be_bryan 0:b74591d5ab33 485
be_bryan 0:b74591d5ab33 486 if( ( ret = mbedtls_ecp_point_read_binary( &key->grp, &key->Q,
be_bryan 0:b74591d5ab33 487 (const unsigned char *) *p, end - *p ) ) == 0 )
be_bryan 0:b74591d5ab33 488 {
be_bryan 0:b74591d5ab33 489 ret = mbedtls_ecp_check_pubkey( &key->grp, &key->Q );
be_bryan 0:b74591d5ab33 490 }
be_bryan 0:b74591d5ab33 491
be_bryan 0:b74591d5ab33 492 /*
be_bryan 0:b74591d5ab33 493 * We know mbedtls_ecp_point_read_binary consumed all bytes or failed
be_bryan 0:b74591d5ab33 494 */
be_bryan 0:b74591d5ab33 495 *p = (unsigned char *) end;
be_bryan 0:b74591d5ab33 496
be_bryan 0:b74591d5ab33 497 return( ret );
be_bryan 0:b74591d5ab33 498 }
be_bryan 0:b74591d5ab33 499 #endif /* MBEDTLS_ECP_C */
be_bryan 0:b74591d5ab33 500
be_bryan 0:b74591d5ab33 501 #if defined(MBEDTLS_RSA_C)
be_bryan 0:b74591d5ab33 502 /*
be_bryan 0:b74591d5ab33 503 * RSAPublicKey ::= SEQUENCE {
be_bryan 0:b74591d5ab33 504 * modulus INTEGER, -- n
be_bryan 0:b74591d5ab33 505 * publicExponent INTEGER -- e
be_bryan 0:b74591d5ab33 506 * }
be_bryan 0:b74591d5ab33 507 */
be_bryan 0:b74591d5ab33 508 static int pk_get_rsapubkey( unsigned char **p,
be_bryan 0:b74591d5ab33 509 const unsigned char *end,
be_bryan 0:b74591d5ab33 510 mbedtls_rsa_context *rsa )
be_bryan 0:b74591d5ab33 511 {
be_bryan 0:b74591d5ab33 512 int ret;
be_bryan 0:b74591d5ab33 513 size_t len;
be_bryan 0:b74591d5ab33 514
be_bryan 0:b74591d5ab33 515 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
be_bryan 0:b74591d5ab33 516 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
be_bryan 0:b74591d5ab33 517 return( MBEDTLS_ERR_PK_INVALID_PUBKEY + ret );
be_bryan 0:b74591d5ab33 518
be_bryan 0:b74591d5ab33 519 if( *p + len != end )
be_bryan 0:b74591d5ab33 520 return( MBEDTLS_ERR_PK_INVALID_PUBKEY +
be_bryan 0:b74591d5ab33 521 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
be_bryan 0:b74591d5ab33 522
be_bryan 0:b74591d5ab33 523 if( ( ret = mbedtls_asn1_get_mpi( p, end, &rsa->N ) ) != 0 ||
be_bryan 0:b74591d5ab33 524 ( ret = mbedtls_asn1_get_mpi( p, end, &rsa->E ) ) != 0 )
be_bryan 0:b74591d5ab33 525 return( MBEDTLS_ERR_PK_INVALID_PUBKEY + ret );
be_bryan 0:b74591d5ab33 526
be_bryan 0:b74591d5ab33 527 if( *p != end )
be_bryan 0:b74591d5ab33 528 return( MBEDTLS_ERR_PK_INVALID_PUBKEY +
be_bryan 0:b74591d5ab33 529 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
be_bryan 0:b74591d5ab33 530
be_bryan 0:b74591d5ab33 531 if( ( ret = mbedtls_rsa_check_pubkey( rsa ) ) != 0 )
be_bryan 0:b74591d5ab33 532 return( MBEDTLS_ERR_PK_INVALID_PUBKEY );
be_bryan 0:b74591d5ab33 533
be_bryan 0:b74591d5ab33 534 rsa->len = mbedtls_mpi_size( &rsa->N );
be_bryan 0:b74591d5ab33 535
be_bryan 0:b74591d5ab33 536 return( 0 );
be_bryan 0:b74591d5ab33 537 }
be_bryan 0:b74591d5ab33 538 #endif /* MBEDTLS_RSA_C */
be_bryan 0:b74591d5ab33 539
be_bryan 0:b74591d5ab33 540 /* Get a PK algorithm identifier
be_bryan 0:b74591d5ab33 541 *
be_bryan 0:b74591d5ab33 542 * AlgorithmIdentifier ::= SEQUENCE {
be_bryan 0:b74591d5ab33 543 * algorithm OBJECT IDENTIFIER,
be_bryan 0:b74591d5ab33 544 * parameters ANY DEFINED BY algorithm OPTIONAL }
be_bryan 0:b74591d5ab33 545 */
be_bryan 0:b74591d5ab33 546 static int pk_get_pk_alg( unsigned char **p,
be_bryan 0:b74591d5ab33 547 const unsigned char *end,
be_bryan 0:b74591d5ab33 548 mbedtls_pk_type_t *pk_alg, mbedtls_asn1_buf *params )
be_bryan 0:b74591d5ab33 549 {
be_bryan 0:b74591d5ab33 550 int ret;
be_bryan 0:b74591d5ab33 551 mbedtls_asn1_buf alg_oid;
be_bryan 0:b74591d5ab33 552
be_bryan 0:b74591d5ab33 553 memset( params, 0, sizeof(mbedtls_asn1_buf) );
be_bryan 0:b74591d5ab33 554
be_bryan 0:b74591d5ab33 555 if( ( ret = mbedtls_asn1_get_alg( p, end, &alg_oid, params ) ) != 0 )
be_bryan 0:b74591d5ab33 556 return( MBEDTLS_ERR_PK_INVALID_ALG + ret );
be_bryan 0:b74591d5ab33 557
be_bryan 0:b74591d5ab33 558 if( mbedtls_oid_get_pk_alg( &alg_oid, pk_alg ) != 0 )
be_bryan 0:b74591d5ab33 559 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
be_bryan 0:b74591d5ab33 560
be_bryan 0:b74591d5ab33 561 /*
be_bryan 0:b74591d5ab33 562 * No parameters with RSA (only for EC)
be_bryan 0:b74591d5ab33 563 */
be_bryan 0:b74591d5ab33 564 if( *pk_alg == MBEDTLS_PK_RSA &&
be_bryan 0:b74591d5ab33 565 ( ( params->tag != MBEDTLS_ASN1_NULL && params->tag != 0 ) ||
be_bryan 0:b74591d5ab33 566 params->len != 0 ) )
be_bryan 0:b74591d5ab33 567 {
be_bryan 0:b74591d5ab33 568 return( MBEDTLS_ERR_PK_INVALID_ALG );
be_bryan 0:b74591d5ab33 569 }
be_bryan 0:b74591d5ab33 570
be_bryan 0:b74591d5ab33 571 return( 0 );
be_bryan 0:b74591d5ab33 572 }
be_bryan 0:b74591d5ab33 573
be_bryan 0:b74591d5ab33 574 /*
be_bryan 0:b74591d5ab33 575 * SubjectPublicKeyInfo ::= SEQUENCE {
be_bryan 0:b74591d5ab33 576 * algorithm AlgorithmIdentifier,
be_bryan 0:b74591d5ab33 577 * subjectPublicKey BIT STRING }
be_bryan 0:b74591d5ab33 578 */
be_bryan 0:b74591d5ab33 579 int mbedtls_pk_parse_subpubkey( unsigned char **p, const unsigned char *end,
be_bryan 0:b74591d5ab33 580 mbedtls_pk_context *pk )
be_bryan 0:b74591d5ab33 581 {
be_bryan 0:b74591d5ab33 582 int ret;
be_bryan 0:b74591d5ab33 583 size_t len;
be_bryan 0:b74591d5ab33 584 mbedtls_asn1_buf alg_params;
be_bryan 0:b74591d5ab33 585 mbedtls_pk_type_t pk_alg = MBEDTLS_PK_NONE;
be_bryan 0:b74591d5ab33 586 const mbedtls_pk_info_t *pk_info;
be_bryan 0:b74591d5ab33 587
be_bryan 0:b74591d5ab33 588 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
be_bryan 0:b74591d5ab33 589 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
be_bryan 0:b74591d5ab33 590 {
be_bryan 0:b74591d5ab33 591 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
be_bryan 0:b74591d5ab33 592 }
be_bryan 0:b74591d5ab33 593
be_bryan 0:b74591d5ab33 594 end = *p + len;
be_bryan 0:b74591d5ab33 595
be_bryan 0:b74591d5ab33 596 if( ( ret = pk_get_pk_alg( p, end, &pk_alg, &alg_params ) ) != 0 )
be_bryan 0:b74591d5ab33 597 return( ret );
be_bryan 0:b74591d5ab33 598
be_bryan 0:b74591d5ab33 599 if( ( ret = mbedtls_asn1_get_bitstring_null( p, end, &len ) ) != 0 )
be_bryan 0:b74591d5ab33 600 return( MBEDTLS_ERR_PK_INVALID_PUBKEY + ret );
be_bryan 0:b74591d5ab33 601
be_bryan 0:b74591d5ab33 602 if( *p + len != end )
be_bryan 0:b74591d5ab33 603 return( MBEDTLS_ERR_PK_INVALID_PUBKEY +
be_bryan 0:b74591d5ab33 604 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
be_bryan 0:b74591d5ab33 605
be_bryan 0:b74591d5ab33 606 if( ( pk_info = mbedtls_pk_info_from_type( pk_alg ) ) == NULL )
be_bryan 0:b74591d5ab33 607 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
be_bryan 0:b74591d5ab33 608
be_bryan 0:b74591d5ab33 609 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 )
be_bryan 0:b74591d5ab33 610 return( ret );
be_bryan 0:b74591d5ab33 611
be_bryan 0:b74591d5ab33 612 #if defined(MBEDTLS_RSA_C)
be_bryan 0:b74591d5ab33 613 if( pk_alg == MBEDTLS_PK_RSA )
be_bryan 0:b74591d5ab33 614 {
be_bryan 0:b74591d5ab33 615 ret = pk_get_rsapubkey( p, end, mbedtls_pk_rsa( *pk ) );
be_bryan 0:b74591d5ab33 616 } else
be_bryan 0:b74591d5ab33 617 #endif /* MBEDTLS_RSA_C */
be_bryan 0:b74591d5ab33 618 #if defined(MBEDTLS_ECP_C)
be_bryan 0:b74591d5ab33 619 if( pk_alg == MBEDTLS_PK_ECKEY_DH || pk_alg == MBEDTLS_PK_ECKEY )
be_bryan 0:b74591d5ab33 620 {
be_bryan 0:b74591d5ab33 621 ret = pk_use_ecparams( &alg_params, &mbedtls_pk_ec( *pk )->grp );
be_bryan 0:b74591d5ab33 622 if( ret == 0 )
be_bryan 0:b74591d5ab33 623 ret = pk_get_ecpubkey( p, end, mbedtls_pk_ec( *pk ) );
be_bryan 0:b74591d5ab33 624 } else
be_bryan 0:b74591d5ab33 625 #endif /* MBEDTLS_ECP_C */
be_bryan 0:b74591d5ab33 626 ret = MBEDTLS_ERR_PK_UNKNOWN_PK_ALG;
be_bryan 0:b74591d5ab33 627
be_bryan 0:b74591d5ab33 628 if( ret == 0 && *p != end )
be_bryan 0:b74591d5ab33 629 ret = MBEDTLS_ERR_PK_INVALID_PUBKEY
be_bryan 0:b74591d5ab33 630 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH;
be_bryan 0:b74591d5ab33 631
be_bryan 0:b74591d5ab33 632 if( ret != 0 )
be_bryan 0:b74591d5ab33 633 mbedtls_pk_free( pk );
be_bryan 0:b74591d5ab33 634
be_bryan 0:b74591d5ab33 635 return( ret );
be_bryan 0:b74591d5ab33 636 }
be_bryan 0:b74591d5ab33 637
be_bryan 0:b74591d5ab33 638 #if defined(MBEDTLS_RSA_C)
be_bryan 0:b74591d5ab33 639 /*
be_bryan 0:b74591d5ab33 640 * Parse a PKCS#1 encoded private RSA key
be_bryan 0:b74591d5ab33 641 */
be_bryan 0:b74591d5ab33 642 static int pk_parse_key_pkcs1_der( mbedtls_rsa_context *rsa,
be_bryan 0:b74591d5ab33 643 const unsigned char *key,
be_bryan 0:b74591d5ab33 644 size_t keylen )
be_bryan 0:b74591d5ab33 645 {
be_bryan 0:b74591d5ab33 646 int ret;
be_bryan 0:b74591d5ab33 647 size_t len;
be_bryan 0:b74591d5ab33 648 unsigned char *p, *end;
be_bryan 0:b74591d5ab33 649
be_bryan 0:b74591d5ab33 650 p = (unsigned char *) key;
be_bryan 0:b74591d5ab33 651 end = p + keylen;
be_bryan 0:b74591d5ab33 652
be_bryan 0:b74591d5ab33 653 /*
be_bryan 0:b74591d5ab33 654 * This function parses the RSAPrivateKey (PKCS#1)
be_bryan 0:b74591d5ab33 655 *
be_bryan 0:b74591d5ab33 656 * RSAPrivateKey ::= SEQUENCE {
be_bryan 0:b74591d5ab33 657 * version Version,
be_bryan 0:b74591d5ab33 658 * modulus INTEGER, -- n
be_bryan 0:b74591d5ab33 659 * publicExponent INTEGER, -- e
be_bryan 0:b74591d5ab33 660 * privateExponent INTEGER, -- d
be_bryan 0:b74591d5ab33 661 * prime1 INTEGER, -- p
be_bryan 0:b74591d5ab33 662 * prime2 INTEGER, -- q
be_bryan 0:b74591d5ab33 663 * exponent1 INTEGER, -- d mod (p-1)
be_bryan 0:b74591d5ab33 664 * exponent2 INTEGER, -- d mod (q-1)
be_bryan 0:b74591d5ab33 665 * coefficient INTEGER, -- (inverse of q) mod p
be_bryan 0:b74591d5ab33 666 * otherPrimeInfos OtherPrimeInfos OPTIONAL
be_bryan 0:b74591d5ab33 667 * }
be_bryan 0:b74591d5ab33 668 */
be_bryan 0:b74591d5ab33 669 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
be_bryan 0:b74591d5ab33 670 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
be_bryan 0:b74591d5ab33 671 {
be_bryan 0:b74591d5ab33 672 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
be_bryan 0:b74591d5ab33 673 }
be_bryan 0:b74591d5ab33 674
be_bryan 0:b74591d5ab33 675 end = p + len;
be_bryan 0:b74591d5ab33 676
be_bryan 0:b74591d5ab33 677 if( ( ret = mbedtls_asn1_get_int( &p, end, &rsa->ver ) ) != 0 )
be_bryan 0:b74591d5ab33 678 {
be_bryan 0:b74591d5ab33 679 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
be_bryan 0:b74591d5ab33 680 }
be_bryan 0:b74591d5ab33 681
be_bryan 0:b74591d5ab33 682 if( rsa->ver != 0 )
be_bryan 0:b74591d5ab33 683 {
be_bryan 0:b74591d5ab33 684 return( MBEDTLS_ERR_PK_KEY_INVALID_VERSION );
be_bryan 0:b74591d5ab33 685 }
be_bryan 0:b74591d5ab33 686
be_bryan 0:b74591d5ab33 687 if( ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->N ) ) != 0 ||
be_bryan 0:b74591d5ab33 688 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->E ) ) != 0 ||
be_bryan 0:b74591d5ab33 689 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->D ) ) != 0 ||
be_bryan 0:b74591d5ab33 690 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->P ) ) != 0 ||
be_bryan 0:b74591d5ab33 691 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->Q ) ) != 0 ||
be_bryan 0:b74591d5ab33 692 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->DP ) ) != 0 ||
be_bryan 0:b74591d5ab33 693 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->DQ ) ) != 0 ||
be_bryan 0:b74591d5ab33 694 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->QP ) ) != 0 )
be_bryan 0:b74591d5ab33 695 {
be_bryan 0:b74591d5ab33 696 mbedtls_rsa_free( rsa );
be_bryan 0:b74591d5ab33 697 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
be_bryan 0:b74591d5ab33 698 }
be_bryan 0:b74591d5ab33 699
be_bryan 0:b74591d5ab33 700 rsa->len = mbedtls_mpi_size( &rsa->N );
be_bryan 0:b74591d5ab33 701
be_bryan 0:b74591d5ab33 702 if( p != end )
be_bryan 0:b74591d5ab33 703 {
be_bryan 0:b74591d5ab33 704 mbedtls_rsa_free( rsa );
be_bryan 0:b74591d5ab33 705 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
be_bryan 0:b74591d5ab33 706 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
be_bryan 0:b74591d5ab33 707 }
be_bryan 0:b74591d5ab33 708
be_bryan 0:b74591d5ab33 709 if( ( ret = mbedtls_rsa_check_privkey( rsa ) ) != 0 )
be_bryan 0:b74591d5ab33 710 {
be_bryan 0:b74591d5ab33 711 mbedtls_rsa_free( rsa );
be_bryan 0:b74591d5ab33 712 return( ret );
be_bryan 0:b74591d5ab33 713 }
be_bryan 0:b74591d5ab33 714
be_bryan 0:b74591d5ab33 715 return( 0 );
be_bryan 0:b74591d5ab33 716 }
be_bryan 0:b74591d5ab33 717 #endif /* MBEDTLS_RSA_C */
be_bryan 0:b74591d5ab33 718
be_bryan 0:b74591d5ab33 719 #if defined(MBEDTLS_ECP_C)
be_bryan 0:b74591d5ab33 720 /*
be_bryan 0:b74591d5ab33 721 * Parse a SEC1 encoded private EC key
be_bryan 0:b74591d5ab33 722 */
be_bryan 0:b74591d5ab33 723 static int pk_parse_key_sec1_der( mbedtls_ecp_keypair *eck,
be_bryan 0:b74591d5ab33 724 const unsigned char *key,
be_bryan 0:b74591d5ab33 725 size_t keylen )
be_bryan 0:b74591d5ab33 726 {
be_bryan 0:b74591d5ab33 727 int ret;
be_bryan 0:b74591d5ab33 728 int version, pubkey_done;
be_bryan 0:b74591d5ab33 729 size_t len;
be_bryan 0:b74591d5ab33 730 mbedtls_asn1_buf params;
be_bryan 0:b74591d5ab33 731 unsigned char *p = (unsigned char *) key;
be_bryan 0:b74591d5ab33 732 unsigned char *end = p + keylen;
be_bryan 0:b74591d5ab33 733 unsigned char *end2;
be_bryan 0:b74591d5ab33 734
be_bryan 0:b74591d5ab33 735 /*
be_bryan 0:b74591d5ab33 736 * RFC 5915, or SEC1 Appendix C.4
be_bryan 0:b74591d5ab33 737 *
be_bryan 0:b74591d5ab33 738 * ECPrivateKey ::= SEQUENCE {
be_bryan 0:b74591d5ab33 739 * version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
be_bryan 0:b74591d5ab33 740 * privateKey OCTET STRING,
be_bryan 0:b74591d5ab33 741 * parameters [0] ECParameters {{ NamedCurve }} OPTIONAL,
be_bryan 0:b74591d5ab33 742 * publicKey [1] BIT STRING OPTIONAL
be_bryan 0:b74591d5ab33 743 * }
be_bryan 0:b74591d5ab33 744 */
be_bryan 0:b74591d5ab33 745 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
be_bryan 0:b74591d5ab33 746 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
be_bryan 0:b74591d5ab33 747 {
be_bryan 0:b74591d5ab33 748 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
be_bryan 0:b74591d5ab33 749 }
be_bryan 0:b74591d5ab33 750
be_bryan 0:b74591d5ab33 751 end = p + len;
be_bryan 0:b74591d5ab33 752
be_bryan 0:b74591d5ab33 753 if( ( ret = mbedtls_asn1_get_int( &p, end, &version ) ) != 0 )
be_bryan 0:b74591d5ab33 754 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
be_bryan 0:b74591d5ab33 755
be_bryan 0:b74591d5ab33 756 if( version != 1 )
be_bryan 0:b74591d5ab33 757 return( MBEDTLS_ERR_PK_KEY_INVALID_VERSION );
be_bryan 0:b74591d5ab33 758
be_bryan 0:b74591d5ab33 759 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
be_bryan 0:b74591d5ab33 760 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
be_bryan 0:b74591d5ab33 761
be_bryan 0:b74591d5ab33 762 if( ( ret = mbedtls_mpi_read_binary( &eck->d, p, len ) ) != 0 )
be_bryan 0:b74591d5ab33 763 {
be_bryan 0:b74591d5ab33 764 mbedtls_ecp_keypair_free( eck );
be_bryan 0:b74591d5ab33 765 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
be_bryan 0:b74591d5ab33 766 }
be_bryan 0:b74591d5ab33 767
be_bryan 0:b74591d5ab33 768 p += len;
be_bryan 0:b74591d5ab33 769
be_bryan 0:b74591d5ab33 770 pubkey_done = 0;
be_bryan 0:b74591d5ab33 771 if( p != end )
be_bryan 0:b74591d5ab33 772 {
be_bryan 0:b74591d5ab33 773 /*
be_bryan 0:b74591d5ab33 774 * Is 'parameters' present?
be_bryan 0:b74591d5ab33 775 */
be_bryan 0:b74591d5ab33 776 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
be_bryan 0:b74591d5ab33 777 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 0 ) ) == 0 )
be_bryan 0:b74591d5ab33 778 {
be_bryan 0:b74591d5ab33 779 if( ( ret = pk_get_ecparams( &p, p + len, &params) ) != 0 ||
be_bryan 0:b74591d5ab33 780 ( ret = pk_use_ecparams( &params, &eck->grp ) ) != 0 )
be_bryan 0:b74591d5ab33 781 {
be_bryan 0:b74591d5ab33 782 mbedtls_ecp_keypair_free( eck );
be_bryan 0:b74591d5ab33 783 return( ret );
be_bryan 0:b74591d5ab33 784 }
be_bryan 0:b74591d5ab33 785 }
be_bryan 0:b74591d5ab33 786 else if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
be_bryan 0:b74591d5ab33 787 {
be_bryan 0:b74591d5ab33 788 mbedtls_ecp_keypair_free( eck );
be_bryan 0:b74591d5ab33 789 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
be_bryan 0:b74591d5ab33 790 }
be_bryan 0:b74591d5ab33 791
be_bryan 0:b74591d5ab33 792 /*
be_bryan 0:b74591d5ab33 793 * Is 'publickey' present? If not, or if we can't read it (eg because it
be_bryan 0:b74591d5ab33 794 * is compressed), create it from the private key.
be_bryan 0:b74591d5ab33 795 */
be_bryan 0:b74591d5ab33 796 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
be_bryan 0:b74591d5ab33 797 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 1 ) ) == 0 )
be_bryan 0:b74591d5ab33 798 {
be_bryan 0:b74591d5ab33 799 end2 = p + len;
be_bryan 0:b74591d5ab33 800
be_bryan 0:b74591d5ab33 801 if( ( ret = mbedtls_asn1_get_bitstring_null( &p, end2, &len ) ) != 0 )
be_bryan 0:b74591d5ab33 802 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
be_bryan 0:b74591d5ab33 803
be_bryan 0:b74591d5ab33 804 if( p + len != end2 )
be_bryan 0:b74591d5ab33 805 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
be_bryan 0:b74591d5ab33 806 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
be_bryan 0:b74591d5ab33 807
be_bryan 0:b74591d5ab33 808 if( ( ret = pk_get_ecpubkey( &p, end2, eck ) ) == 0 )
be_bryan 0:b74591d5ab33 809 pubkey_done = 1;
be_bryan 0:b74591d5ab33 810 else
be_bryan 0:b74591d5ab33 811 {
be_bryan 0:b74591d5ab33 812 /*
be_bryan 0:b74591d5ab33 813 * The only acceptable failure mode of pk_get_ecpubkey() above
be_bryan 0:b74591d5ab33 814 * is if the point format is not recognized.
be_bryan 0:b74591d5ab33 815 */
be_bryan 0:b74591d5ab33 816 if( ret != MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE )
be_bryan 0:b74591d5ab33 817 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
be_bryan 0:b74591d5ab33 818 }
be_bryan 0:b74591d5ab33 819 }
be_bryan 0:b74591d5ab33 820 else if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
be_bryan 0:b74591d5ab33 821 {
be_bryan 0:b74591d5ab33 822 mbedtls_ecp_keypair_free( eck );
be_bryan 0:b74591d5ab33 823 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
be_bryan 0:b74591d5ab33 824 }
be_bryan 0:b74591d5ab33 825 }
be_bryan 0:b74591d5ab33 826
be_bryan 0:b74591d5ab33 827 if( ! pubkey_done &&
be_bryan 0:b74591d5ab33 828 ( ret = mbedtls_ecp_mul( &eck->grp, &eck->Q, &eck->d, &eck->grp.G,
be_bryan 0:b74591d5ab33 829 NULL, NULL ) ) != 0 )
be_bryan 0:b74591d5ab33 830 {
be_bryan 0:b74591d5ab33 831 mbedtls_ecp_keypair_free( eck );
be_bryan 0:b74591d5ab33 832 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
be_bryan 0:b74591d5ab33 833 }
be_bryan 0:b74591d5ab33 834
be_bryan 0:b74591d5ab33 835 if( ( ret = mbedtls_ecp_check_privkey( &eck->grp, &eck->d ) ) != 0 )
be_bryan 0:b74591d5ab33 836 {
be_bryan 0:b74591d5ab33 837 mbedtls_ecp_keypair_free( eck );
be_bryan 0:b74591d5ab33 838 return( ret );
be_bryan 0:b74591d5ab33 839 }
be_bryan 0:b74591d5ab33 840
be_bryan 0:b74591d5ab33 841 return( 0 );
be_bryan 0:b74591d5ab33 842 }
be_bryan 0:b74591d5ab33 843 #endif /* MBEDTLS_ECP_C */
be_bryan 0:b74591d5ab33 844
be_bryan 0:b74591d5ab33 845 /*
be_bryan 0:b74591d5ab33 846 * Parse an unencrypted PKCS#8 encoded private key
be_bryan 0:b74591d5ab33 847 */
be_bryan 0:b74591d5ab33 848 static int pk_parse_key_pkcs8_unencrypted_der(
be_bryan 0:b74591d5ab33 849 mbedtls_pk_context *pk,
be_bryan 0:b74591d5ab33 850 const unsigned char* key,
be_bryan 0:b74591d5ab33 851 size_t keylen )
be_bryan 0:b74591d5ab33 852 {
be_bryan 0:b74591d5ab33 853 int ret, version;
be_bryan 0:b74591d5ab33 854 size_t len;
be_bryan 0:b74591d5ab33 855 mbedtls_asn1_buf params;
be_bryan 0:b74591d5ab33 856 unsigned char *p = (unsigned char *) key;
be_bryan 0:b74591d5ab33 857 unsigned char *end = p + keylen;
be_bryan 0:b74591d5ab33 858 mbedtls_pk_type_t pk_alg = MBEDTLS_PK_NONE;
be_bryan 0:b74591d5ab33 859 const mbedtls_pk_info_t *pk_info;
be_bryan 0:b74591d5ab33 860
be_bryan 0:b74591d5ab33 861 /*
be_bryan 0:b74591d5ab33 862 * This function parses the PrivatKeyInfo object (PKCS#8 v1.2 = RFC 5208)
be_bryan 0:b74591d5ab33 863 *
be_bryan 0:b74591d5ab33 864 * PrivateKeyInfo ::= SEQUENCE {
be_bryan 0:b74591d5ab33 865 * version Version,
be_bryan 0:b74591d5ab33 866 * privateKeyAlgorithm PrivateKeyAlgorithmIdentifier,
be_bryan 0:b74591d5ab33 867 * privateKey PrivateKey,
be_bryan 0:b74591d5ab33 868 * attributes [0] IMPLICIT Attributes OPTIONAL }
be_bryan 0:b74591d5ab33 869 *
be_bryan 0:b74591d5ab33 870 * Version ::= INTEGER
be_bryan 0:b74591d5ab33 871 * PrivateKeyAlgorithmIdentifier ::= AlgorithmIdentifier
be_bryan 0:b74591d5ab33 872 * PrivateKey ::= OCTET STRING
be_bryan 0:b74591d5ab33 873 *
be_bryan 0:b74591d5ab33 874 * The PrivateKey OCTET STRING is a SEC1 ECPrivateKey
be_bryan 0:b74591d5ab33 875 */
be_bryan 0:b74591d5ab33 876
be_bryan 0:b74591d5ab33 877 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
be_bryan 0:b74591d5ab33 878 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
be_bryan 0:b74591d5ab33 879 {
be_bryan 0:b74591d5ab33 880 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
be_bryan 0:b74591d5ab33 881 }
be_bryan 0:b74591d5ab33 882
be_bryan 0:b74591d5ab33 883 end = p + len;
be_bryan 0:b74591d5ab33 884
be_bryan 0:b74591d5ab33 885 if( ( ret = mbedtls_asn1_get_int( &p, end, &version ) ) != 0 )
be_bryan 0:b74591d5ab33 886 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
be_bryan 0:b74591d5ab33 887
be_bryan 0:b74591d5ab33 888 if( version != 0 )
be_bryan 0:b74591d5ab33 889 return( MBEDTLS_ERR_PK_KEY_INVALID_VERSION + ret );
be_bryan 0:b74591d5ab33 890
be_bryan 0:b74591d5ab33 891 if( ( ret = pk_get_pk_alg( &p, end, &pk_alg, &params ) ) != 0 )
be_bryan 0:b74591d5ab33 892 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
be_bryan 0:b74591d5ab33 893
be_bryan 0:b74591d5ab33 894 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
be_bryan 0:b74591d5ab33 895 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
be_bryan 0:b74591d5ab33 896
be_bryan 0:b74591d5ab33 897 if( len < 1 )
be_bryan 0:b74591d5ab33 898 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
be_bryan 0:b74591d5ab33 899 MBEDTLS_ERR_ASN1_OUT_OF_DATA );
be_bryan 0:b74591d5ab33 900
be_bryan 0:b74591d5ab33 901 if( ( pk_info = mbedtls_pk_info_from_type( pk_alg ) ) == NULL )
be_bryan 0:b74591d5ab33 902 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
be_bryan 0:b74591d5ab33 903
be_bryan 0:b74591d5ab33 904 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 )
be_bryan 0:b74591d5ab33 905 return( ret );
be_bryan 0:b74591d5ab33 906
be_bryan 0:b74591d5ab33 907 #if defined(MBEDTLS_RSA_C)
be_bryan 0:b74591d5ab33 908 if( pk_alg == MBEDTLS_PK_RSA )
be_bryan 0:b74591d5ab33 909 {
be_bryan 0:b74591d5ab33 910 if( ( ret = pk_parse_key_pkcs1_der( mbedtls_pk_rsa( *pk ), p, len ) ) != 0 )
be_bryan 0:b74591d5ab33 911 {
be_bryan 0:b74591d5ab33 912 mbedtls_pk_free( pk );
be_bryan 0:b74591d5ab33 913 return( ret );
be_bryan 0:b74591d5ab33 914 }
be_bryan 0:b74591d5ab33 915 } else
be_bryan 0:b74591d5ab33 916 #endif /* MBEDTLS_RSA_C */
be_bryan 0:b74591d5ab33 917 #if defined(MBEDTLS_ECP_C)
be_bryan 0:b74591d5ab33 918 if( pk_alg == MBEDTLS_PK_ECKEY || pk_alg == MBEDTLS_PK_ECKEY_DH )
be_bryan 0:b74591d5ab33 919 {
be_bryan 0:b74591d5ab33 920 if( ( ret = pk_use_ecparams( &params, &mbedtls_pk_ec( *pk )->grp ) ) != 0 ||
be_bryan 0:b74591d5ab33 921 ( ret = pk_parse_key_sec1_der( mbedtls_pk_ec( *pk ), p, len ) ) != 0 )
be_bryan 0:b74591d5ab33 922 {
be_bryan 0:b74591d5ab33 923 mbedtls_pk_free( pk );
be_bryan 0:b74591d5ab33 924 return( ret );
be_bryan 0:b74591d5ab33 925 }
be_bryan 0:b74591d5ab33 926 } else
be_bryan 0:b74591d5ab33 927 #endif /* MBEDTLS_ECP_C */
be_bryan 0:b74591d5ab33 928 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
be_bryan 0:b74591d5ab33 929
be_bryan 0:b74591d5ab33 930 return( 0 );
be_bryan 0:b74591d5ab33 931 }
be_bryan 0:b74591d5ab33 932
be_bryan 0:b74591d5ab33 933 /*
be_bryan 0:b74591d5ab33 934 * Parse an encrypted PKCS#8 encoded private key
be_bryan 0:b74591d5ab33 935 */
be_bryan 0:b74591d5ab33 936 #if defined(MBEDTLS_PKCS12_C) || defined(MBEDTLS_PKCS5_C)
be_bryan 0:b74591d5ab33 937 static int pk_parse_key_pkcs8_encrypted_der(
be_bryan 0:b74591d5ab33 938 mbedtls_pk_context *pk,
be_bryan 0:b74591d5ab33 939 const unsigned char *key, size_t keylen,
be_bryan 0:b74591d5ab33 940 const unsigned char *pwd, size_t pwdlen )
be_bryan 0:b74591d5ab33 941 {
be_bryan 0:b74591d5ab33 942 int ret, decrypted = 0;
be_bryan 0:b74591d5ab33 943 size_t len;
be_bryan 0:b74591d5ab33 944 unsigned char buf[2048];
be_bryan 0:b74591d5ab33 945 unsigned char *p, *end;
be_bryan 0:b74591d5ab33 946 mbedtls_asn1_buf pbe_alg_oid, pbe_params;
be_bryan 0:b74591d5ab33 947 #if defined(MBEDTLS_PKCS12_C)
be_bryan 0:b74591d5ab33 948 mbedtls_cipher_type_t cipher_alg;
be_bryan 0:b74591d5ab33 949 mbedtls_md_type_t md_alg;
be_bryan 0:b74591d5ab33 950 #endif
be_bryan 0:b74591d5ab33 951
be_bryan 0:b74591d5ab33 952 memset( buf, 0, sizeof( buf ) );
be_bryan 0:b74591d5ab33 953
be_bryan 0:b74591d5ab33 954 p = (unsigned char *) key;
be_bryan 0:b74591d5ab33 955 end = p + keylen;
be_bryan 0:b74591d5ab33 956
be_bryan 0:b74591d5ab33 957 if( pwdlen == 0 )
be_bryan 0:b74591d5ab33 958 return( MBEDTLS_ERR_PK_PASSWORD_REQUIRED );
be_bryan 0:b74591d5ab33 959
be_bryan 0:b74591d5ab33 960 /*
be_bryan 0:b74591d5ab33 961 * This function parses the EncryptedPrivatKeyInfo object (PKCS#8)
be_bryan 0:b74591d5ab33 962 *
be_bryan 0:b74591d5ab33 963 * EncryptedPrivateKeyInfo ::= SEQUENCE {
be_bryan 0:b74591d5ab33 964 * encryptionAlgorithm EncryptionAlgorithmIdentifier,
be_bryan 0:b74591d5ab33 965 * encryptedData EncryptedData
be_bryan 0:b74591d5ab33 966 * }
be_bryan 0:b74591d5ab33 967 *
be_bryan 0:b74591d5ab33 968 * EncryptionAlgorithmIdentifier ::= AlgorithmIdentifier
be_bryan 0:b74591d5ab33 969 *
be_bryan 0:b74591d5ab33 970 * EncryptedData ::= OCTET STRING
be_bryan 0:b74591d5ab33 971 *
be_bryan 0:b74591d5ab33 972 * The EncryptedData OCTET STRING is a PKCS#8 PrivateKeyInfo
be_bryan 0:b74591d5ab33 973 */
be_bryan 0:b74591d5ab33 974 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
be_bryan 0:b74591d5ab33 975 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
be_bryan 0:b74591d5ab33 976 {
be_bryan 0:b74591d5ab33 977 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
be_bryan 0:b74591d5ab33 978 }
be_bryan 0:b74591d5ab33 979
be_bryan 0:b74591d5ab33 980 end = p + len;
be_bryan 0:b74591d5ab33 981
be_bryan 0:b74591d5ab33 982 if( ( ret = mbedtls_asn1_get_alg( &p, end, &pbe_alg_oid, &pbe_params ) ) != 0 )
be_bryan 0:b74591d5ab33 983 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
be_bryan 0:b74591d5ab33 984
be_bryan 0:b74591d5ab33 985 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
be_bryan 0:b74591d5ab33 986 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
be_bryan 0:b74591d5ab33 987
be_bryan 0:b74591d5ab33 988 if( len > sizeof( buf ) )
be_bryan 0:b74591d5ab33 989 return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
be_bryan 0:b74591d5ab33 990
be_bryan 0:b74591d5ab33 991 /*
be_bryan 0:b74591d5ab33 992 * Decrypt EncryptedData with appropriate PDE
be_bryan 0:b74591d5ab33 993 */
be_bryan 0:b74591d5ab33 994 #if defined(MBEDTLS_PKCS12_C)
be_bryan 0:b74591d5ab33 995 if( mbedtls_oid_get_pkcs12_pbe_alg( &pbe_alg_oid, &md_alg, &cipher_alg ) == 0 )
be_bryan 0:b74591d5ab33 996 {
be_bryan 0:b74591d5ab33 997 if( ( ret = mbedtls_pkcs12_pbe( &pbe_params, MBEDTLS_PKCS12_PBE_DECRYPT,
be_bryan 0:b74591d5ab33 998 cipher_alg, md_alg,
be_bryan 0:b74591d5ab33 999 pwd, pwdlen, p, len, buf ) ) != 0 )
be_bryan 0:b74591d5ab33 1000 {
be_bryan 0:b74591d5ab33 1001 if( ret == MBEDTLS_ERR_PKCS12_PASSWORD_MISMATCH )
be_bryan 0:b74591d5ab33 1002 return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
be_bryan 0:b74591d5ab33 1003
be_bryan 0:b74591d5ab33 1004 return( ret );
be_bryan 0:b74591d5ab33 1005 }
be_bryan 0:b74591d5ab33 1006
be_bryan 0:b74591d5ab33 1007 decrypted = 1;
be_bryan 0:b74591d5ab33 1008 }
be_bryan 0:b74591d5ab33 1009 else if( MBEDTLS_OID_CMP( MBEDTLS_OID_PKCS12_PBE_SHA1_RC4_128, &pbe_alg_oid ) == 0 )
be_bryan 0:b74591d5ab33 1010 {
be_bryan 0:b74591d5ab33 1011 if( ( ret = mbedtls_pkcs12_pbe_sha1_rc4_128( &pbe_params,
be_bryan 0:b74591d5ab33 1012 MBEDTLS_PKCS12_PBE_DECRYPT,
be_bryan 0:b74591d5ab33 1013 pwd, pwdlen,
be_bryan 0:b74591d5ab33 1014 p, len, buf ) ) != 0 )
be_bryan 0:b74591d5ab33 1015 {
be_bryan 0:b74591d5ab33 1016 return( ret );
be_bryan 0:b74591d5ab33 1017 }
be_bryan 0:b74591d5ab33 1018
be_bryan 0:b74591d5ab33 1019 // Best guess for password mismatch when using RC4. If first tag is
be_bryan 0:b74591d5ab33 1020 // not MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE
be_bryan 0:b74591d5ab33 1021 //
be_bryan 0:b74591d5ab33 1022 if( *buf != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) )
be_bryan 0:b74591d5ab33 1023 return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
be_bryan 0:b74591d5ab33 1024
be_bryan 0:b74591d5ab33 1025 decrypted = 1;
be_bryan 0:b74591d5ab33 1026 }
be_bryan 0:b74591d5ab33 1027 else
be_bryan 0:b74591d5ab33 1028 #endif /* MBEDTLS_PKCS12_C */
be_bryan 0:b74591d5ab33 1029 #if defined(MBEDTLS_PKCS5_C)
be_bryan 0:b74591d5ab33 1030 if( MBEDTLS_OID_CMP( MBEDTLS_OID_PKCS5_PBES2, &pbe_alg_oid ) == 0 )
be_bryan 0:b74591d5ab33 1031 {
be_bryan 0:b74591d5ab33 1032 if( ( ret = mbedtls_pkcs5_pbes2( &pbe_params, MBEDTLS_PKCS5_DECRYPT, pwd, pwdlen,
be_bryan 0:b74591d5ab33 1033 p, len, buf ) ) != 0 )
be_bryan 0:b74591d5ab33 1034 {
be_bryan 0:b74591d5ab33 1035 if( ret == MBEDTLS_ERR_PKCS5_PASSWORD_MISMATCH )
be_bryan 0:b74591d5ab33 1036 return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
be_bryan 0:b74591d5ab33 1037
be_bryan 0:b74591d5ab33 1038 return( ret );
be_bryan 0:b74591d5ab33 1039 }
be_bryan 0:b74591d5ab33 1040
be_bryan 0:b74591d5ab33 1041 decrypted = 1;
be_bryan 0:b74591d5ab33 1042 }
be_bryan 0:b74591d5ab33 1043 else
be_bryan 0:b74591d5ab33 1044 #endif /* MBEDTLS_PKCS5_C */
be_bryan 0:b74591d5ab33 1045 {
be_bryan 0:b74591d5ab33 1046 ((void) pwd);
be_bryan 0:b74591d5ab33 1047 }
be_bryan 0:b74591d5ab33 1048
be_bryan 0:b74591d5ab33 1049 if( decrypted == 0 )
be_bryan 0:b74591d5ab33 1050 return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
be_bryan 0:b74591d5ab33 1051
be_bryan 0:b74591d5ab33 1052 return( pk_parse_key_pkcs8_unencrypted_der( pk, buf, len ) );
be_bryan 0:b74591d5ab33 1053 }
be_bryan 0:b74591d5ab33 1054 #endif /* MBEDTLS_PKCS12_C || MBEDTLS_PKCS5_C */
be_bryan 0:b74591d5ab33 1055
be_bryan 0:b74591d5ab33 1056 /*
be_bryan 0:b74591d5ab33 1057 * Parse a private key
be_bryan 0:b74591d5ab33 1058 */
be_bryan 0:b74591d5ab33 1059 int mbedtls_pk_parse_key( mbedtls_pk_context *pk,
be_bryan 0:b74591d5ab33 1060 const unsigned char *key, size_t keylen,
be_bryan 0:b74591d5ab33 1061 const unsigned char *pwd, size_t pwdlen )
be_bryan 0:b74591d5ab33 1062 {
be_bryan 0:b74591d5ab33 1063 int ret;
be_bryan 0:b74591d5ab33 1064 const mbedtls_pk_info_t *pk_info;
be_bryan 0:b74591d5ab33 1065
be_bryan 0:b74591d5ab33 1066 #if defined(MBEDTLS_PEM_PARSE_C)
be_bryan 0:b74591d5ab33 1067 size_t len;
be_bryan 0:b74591d5ab33 1068 mbedtls_pem_context pem;
be_bryan 0:b74591d5ab33 1069
be_bryan 0:b74591d5ab33 1070 mbedtls_pem_init( &pem );
be_bryan 0:b74591d5ab33 1071
be_bryan 0:b74591d5ab33 1072 #if defined(MBEDTLS_RSA_C)
be_bryan 0:b74591d5ab33 1073 /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
be_bryan 0:b74591d5ab33 1074 if( keylen == 0 || key[keylen - 1] != '\0' )
be_bryan 0:b74591d5ab33 1075 ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
be_bryan 0:b74591d5ab33 1076 else
be_bryan 0:b74591d5ab33 1077 ret = mbedtls_pem_read_buffer( &pem,
be_bryan 0:b74591d5ab33 1078 "-----BEGIN RSA PRIVATE KEY-----",
be_bryan 0:b74591d5ab33 1079 "-----END RSA PRIVATE KEY-----",
be_bryan 0:b74591d5ab33 1080 key, pwd, pwdlen, &len );
be_bryan 0:b74591d5ab33 1081
be_bryan 0:b74591d5ab33 1082 if( ret == 0 )
be_bryan 0:b74591d5ab33 1083 {
be_bryan 0:b74591d5ab33 1084 if( ( pk_info = mbedtls_pk_info_from_type( MBEDTLS_PK_RSA ) ) == NULL )
be_bryan 0:b74591d5ab33 1085 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
be_bryan 0:b74591d5ab33 1086
be_bryan 0:b74591d5ab33 1087 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 ||
be_bryan 0:b74591d5ab33 1088 ( ret = pk_parse_key_pkcs1_der( mbedtls_pk_rsa( *pk ),
be_bryan 0:b74591d5ab33 1089 pem.buf, pem.buflen ) ) != 0 )
be_bryan 0:b74591d5ab33 1090 {
be_bryan 0:b74591d5ab33 1091 mbedtls_pk_free( pk );
be_bryan 0:b74591d5ab33 1092 }
be_bryan 0:b74591d5ab33 1093
be_bryan 0:b74591d5ab33 1094 mbedtls_pem_free( &pem );
be_bryan 0:b74591d5ab33 1095 return( ret );
be_bryan 0:b74591d5ab33 1096 }
be_bryan 0:b74591d5ab33 1097 else if( ret == MBEDTLS_ERR_PEM_PASSWORD_MISMATCH )
be_bryan 0:b74591d5ab33 1098 return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
be_bryan 0:b74591d5ab33 1099 else if( ret == MBEDTLS_ERR_PEM_PASSWORD_REQUIRED )
be_bryan 0:b74591d5ab33 1100 return( MBEDTLS_ERR_PK_PASSWORD_REQUIRED );
be_bryan 0:b74591d5ab33 1101 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
be_bryan 0:b74591d5ab33 1102 return( ret );
be_bryan 0:b74591d5ab33 1103 #endif /* MBEDTLS_RSA_C */
be_bryan 0:b74591d5ab33 1104
be_bryan 0:b74591d5ab33 1105 #if defined(MBEDTLS_ECP_C)
be_bryan 0:b74591d5ab33 1106 /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
be_bryan 0:b74591d5ab33 1107 if( keylen == 0 || key[keylen - 1] != '\0' )
be_bryan 0:b74591d5ab33 1108 ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
be_bryan 0:b74591d5ab33 1109 else
be_bryan 0:b74591d5ab33 1110 ret = mbedtls_pem_read_buffer( &pem,
be_bryan 0:b74591d5ab33 1111 "-----BEGIN EC PRIVATE KEY-----",
be_bryan 0:b74591d5ab33 1112 "-----END EC PRIVATE KEY-----",
be_bryan 0:b74591d5ab33 1113 key, pwd, pwdlen, &len );
be_bryan 0:b74591d5ab33 1114 if( ret == 0 )
be_bryan 0:b74591d5ab33 1115 {
be_bryan 0:b74591d5ab33 1116 if( ( pk_info = mbedtls_pk_info_from_type( MBEDTLS_PK_ECKEY ) ) == NULL )
be_bryan 0:b74591d5ab33 1117 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
be_bryan 0:b74591d5ab33 1118
be_bryan 0:b74591d5ab33 1119 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 ||
be_bryan 0:b74591d5ab33 1120 ( ret = pk_parse_key_sec1_der( mbedtls_pk_ec( *pk ),
be_bryan 0:b74591d5ab33 1121 pem.buf, pem.buflen ) ) != 0 )
be_bryan 0:b74591d5ab33 1122 {
be_bryan 0:b74591d5ab33 1123 mbedtls_pk_free( pk );
be_bryan 0:b74591d5ab33 1124 }
be_bryan 0:b74591d5ab33 1125
be_bryan 0:b74591d5ab33 1126 mbedtls_pem_free( &pem );
be_bryan 0:b74591d5ab33 1127 return( ret );
be_bryan 0:b74591d5ab33 1128 }
be_bryan 0:b74591d5ab33 1129 else if( ret == MBEDTLS_ERR_PEM_PASSWORD_MISMATCH )
be_bryan 0:b74591d5ab33 1130 return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
be_bryan 0:b74591d5ab33 1131 else if( ret == MBEDTLS_ERR_PEM_PASSWORD_REQUIRED )
be_bryan 0:b74591d5ab33 1132 return( MBEDTLS_ERR_PK_PASSWORD_REQUIRED );
be_bryan 0:b74591d5ab33 1133 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
be_bryan 0:b74591d5ab33 1134 return( ret );
be_bryan 0:b74591d5ab33 1135 #endif /* MBEDTLS_ECP_C */
be_bryan 0:b74591d5ab33 1136
be_bryan 0:b74591d5ab33 1137 /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
be_bryan 0:b74591d5ab33 1138 if( keylen == 0 || key[keylen - 1] != '\0' )
be_bryan 0:b74591d5ab33 1139 ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
be_bryan 0:b74591d5ab33 1140 else
be_bryan 0:b74591d5ab33 1141 ret = mbedtls_pem_read_buffer( &pem,
be_bryan 0:b74591d5ab33 1142 "-----BEGIN PRIVATE KEY-----",
be_bryan 0:b74591d5ab33 1143 "-----END PRIVATE KEY-----",
be_bryan 0:b74591d5ab33 1144 key, NULL, 0, &len );
be_bryan 0:b74591d5ab33 1145 if( ret == 0 )
be_bryan 0:b74591d5ab33 1146 {
be_bryan 0:b74591d5ab33 1147 if( ( ret = pk_parse_key_pkcs8_unencrypted_der( pk,
be_bryan 0:b74591d5ab33 1148 pem.buf, pem.buflen ) ) != 0 )
be_bryan 0:b74591d5ab33 1149 {
be_bryan 0:b74591d5ab33 1150 mbedtls_pk_free( pk );
be_bryan 0:b74591d5ab33 1151 }
be_bryan 0:b74591d5ab33 1152
be_bryan 0:b74591d5ab33 1153 mbedtls_pem_free( &pem );
be_bryan 0:b74591d5ab33 1154 return( ret );
be_bryan 0:b74591d5ab33 1155 }
be_bryan 0:b74591d5ab33 1156 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
be_bryan 0:b74591d5ab33 1157 return( ret );
be_bryan 0:b74591d5ab33 1158
be_bryan 0:b74591d5ab33 1159 #if defined(MBEDTLS_PKCS12_C) || defined(MBEDTLS_PKCS5_C)
be_bryan 0:b74591d5ab33 1160 /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
be_bryan 0:b74591d5ab33 1161 if( keylen == 0 || key[keylen - 1] != '\0' )
be_bryan 0:b74591d5ab33 1162 ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
be_bryan 0:b74591d5ab33 1163 else
be_bryan 0:b74591d5ab33 1164 ret = mbedtls_pem_read_buffer( &pem,
be_bryan 0:b74591d5ab33 1165 "-----BEGIN ENCRYPTED PRIVATE KEY-----",
be_bryan 0:b74591d5ab33 1166 "-----END ENCRYPTED PRIVATE KEY-----",
be_bryan 0:b74591d5ab33 1167 key, NULL, 0, &len );
be_bryan 0:b74591d5ab33 1168 if( ret == 0 )
be_bryan 0:b74591d5ab33 1169 {
be_bryan 0:b74591d5ab33 1170 if( ( ret = pk_parse_key_pkcs8_encrypted_der( pk,
be_bryan 0:b74591d5ab33 1171 pem.buf, pem.buflen,
be_bryan 0:b74591d5ab33 1172 pwd, pwdlen ) ) != 0 )
be_bryan 0:b74591d5ab33 1173 {
be_bryan 0:b74591d5ab33 1174 mbedtls_pk_free( pk );
be_bryan 0:b74591d5ab33 1175 }
be_bryan 0:b74591d5ab33 1176
be_bryan 0:b74591d5ab33 1177 mbedtls_pem_free( &pem );
be_bryan 0:b74591d5ab33 1178 return( ret );
be_bryan 0:b74591d5ab33 1179 }
be_bryan 0:b74591d5ab33 1180 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
be_bryan 0:b74591d5ab33 1181 return( ret );
be_bryan 0:b74591d5ab33 1182 #endif /* MBEDTLS_PKCS12_C || MBEDTLS_PKCS5_C */
be_bryan 0:b74591d5ab33 1183 #else
be_bryan 0:b74591d5ab33 1184 ((void) ret);
be_bryan 0:b74591d5ab33 1185 ((void) pwd);
be_bryan 0:b74591d5ab33 1186 ((void) pwdlen);
be_bryan 0:b74591d5ab33 1187 #endif /* MBEDTLS_PEM_PARSE_C */
be_bryan 0:b74591d5ab33 1188
be_bryan 0:b74591d5ab33 1189 /*
be_bryan 0:b74591d5ab33 1190 * At this point we only know it's not a PEM formatted key. Could be any
be_bryan 0:b74591d5ab33 1191 * of the known DER encoded private key formats
be_bryan 0:b74591d5ab33 1192 *
be_bryan 0:b74591d5ab33 1193 * We try the different DER format parsers to see if one passes without
be_bryan 0:b74591d5ab33 1194 * error
be_bryan 0:b74591d5ab33 1195 */
be_bryan 0:b74591d5ab33 1196 #if defined(MBEDTLS_PKCS12_C) || defined(MBEDTLS_PKCS5_C)
be_bryan 0:b74591d5ab33 1197 if( ( ret = pk_parse_key_pkcs8_encrypted_der( pk, key, keylen,
be_bryan 0:b74591d5ab33 1198 pwd, pwdlen ) ) == 0 )
be_bryan 0:b74591d5ab33 1199 {
be_bryan 0:b74591d5ab33 1200 return( 0 );
be_bryan 0:b74591d5ab33 1201 }
be_bryan 0:b74591d5ab33 1202
be_bryan 0:b74591d5ab33 1203 mbedtls_pk_free( pk );
be_bryan 0:b74591d5ab33 1204
be_bryan 0:b74591d5ab33 1205 if( ret == MBEDTLS_ERR_PK_PASSWORD_MISMATCH )
be_bryan 0:b74591d5ab33 1206 {
be_bryan 0:b74591d5ab33 1207 return( ret );
be_bryan 0:b74591d5ab33 1208 }
be_bryan 0:b74591d5ab33 1209 #endif /* MBEDTLS_PKCS12_C || MBEDTLS_PKCS5_C */
be_bryan 0:b74591d5ab33 1210
be_bryan 0:b74591d5ab33 1211 if( ( ret = pk_parse_key_pkcs8_unencrypted_der( pk, key, keylen ) ) == 0 )
be_bryan 0:b74591d5ab33 1212 return( 0 );
be_bryan 0:b74591d5ab33 1213
be_bryan 0:b74591d5ab33 1214 mbedtls_pk_free( pk );
be_bryan 0:b74591d5ab33 1215
be_bryan 0:b74591d5ab33 1216 #if defined(MBEDTLS_RSA_C)
be_bryan 0:b74591d5ab33 1217 if( ( pk_info = mbedtls_pk_info_from_type( MBEDTLS_PK_RSA ) ) == NULL )
be_bryan 0:b74591d5ab33 1218 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
be_bryan 0:b74591d5ab33 1219
be_bryan 0:b74591d5ab33 1220 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 ||
be_bryan 0:b74591d5ab33 1221 ( ret = pk_parse_key_pkcs1_der( mbedtls_pk_rsa( *pk ), key, keylen ) ) == 0 )
be_bryan 0:b74591d5ab33 1222 {
be_bryan 0:b74591d5ab33 1223 return( 0 );
be_bryan 0:b74591d5ab33 1224 }
be_bryan 0:b74591d5ab33 1225
be_bryan 0:b74591d5ab33 1226 mbedtls_pk_free( pk );
be_bryan 0:b74591d5ab33 1227 #endif /* MBEDTLS_RSA_C */
be_bryan 0:b74591d5ab33 1228
be_bryan 0:b74591d5ab33 1229 #if defined(MBEDTLS_ECP_C)
be_bryan 0:b74591d5ab33 1230 if( ( pk_info = mbedtls_pk_info_from_type( MBEDTLS_PK_ECKEY ) ) == NULL )
be_bryan 0:b74591d5ab33 1231 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
be_bryan 0:b74591d5ab33 1232
be_bryan 0:b74591d5ab33 1233 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 ||
be_bryan 0:b74591d5ab33 1234 ( ret = pk_parse_key_sec1_der( mbedtls_pk_ec( *pk ), key, keylen ) ) == 0 )
be_bryan 0:b74591d5ab33 1235 {
be_bryan 0:b74591d5ab33 1236 return( 0 );
be_bryan 0:b74591d5ab33 1237 }
be_bryan 0:b74591d5ab33 1238
be_bryan 0:b74591d5ab33 1239 mbedtls_pk_free( pk );
be_bryan 0:b74591d5ab33 1240 #endif /* MBEDTLS_ECP_C */
be_bryan 0:b74591d5ab33 1241
be_bryan 0:b74591d5ab33 1242 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
be_bryan 0:b74591d5ab33 1243 }
be_bryan 0:b74591d5ab33 1244
be_bryan 0:b74591d5ab33 1245 /*
be_bryan 0:b74591d5ab33 1246 * Parse a public key
be_bryan 0:b74591d5ab33 1247 */
be_bryan 0:b74591d5ab33 1248 int mbedtls_pk_parse_public_key( mbedtls_pk_context *ctx,
be_bryan 0:b74591d5ab33 1249 const unsigned char *key, size_t keylen )
be_bryan 0:b74591d5ab33 1250 {
be_bryan 0:b74591d5ab33 1251 int ret;
be_bryan 0:b74591d5ab33 1252 unsigned char *p;
be_bryan 0:b74591d5ab33 1253 #if defined(MBEDTLS_PEM_PARSE_C)
be_bryan 0:b74591d5ab33 1254 size_t len;
be_bryan 0:b74591d5ab33 1255 mbedtls_pem_context pem;
be_bryan 0:b74591d5ab33 1256
be_bryan 0:b74591d5ab33 1257 mbedtls_pem_init( &pem );
be_bryan 0:b74591d5ab33 1258
be_bryan 0:b74591d5ab33 1259 /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
be_bryan 0:b74591d5ab33 1260 if( keylen == 0 || key[keylen - 1] != '\0' )
be_bryan 0:b74591d5ab33 1261 ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
be_bryan 0:b74591d5ab33 1262 else
be_bryan 0:b74591d5ab33 1263 ret = mbedtls_pem_read_buffer( &pem,
be_bryan 0:b74591d5ab33 1264 "-----BEGIN PUBLIC KEY-----",
be_bryan 0:b74591d5ab33 1265 "-----END PUBLIC KEY-----",
be_bryan 0:b74591d5ab33 1266 key, NULL, 0, &len );
be_bryan 0:b74591d5ab33 1267
be_bryan 0:b74591d5ab33 1268 if( ret == 0 )
be_bryan 0:b74591d5ab33 1269 {
be_bryan 0:b74591d5ab33 1270 /*
be_bryan 0:b74591d5ab33 1271 * Was PEM encoded
be_bryan 0:b74591d5ab33 1272 */
be_bryan 0:b74591d5ab33 1273 key = pem.buf;
be_bryan 0:b74591d5ab33 1274 keylen = pem.buflen;
be_bryan 0:b74591d5ab33 1275 }
be_bryan 0:b74591d5ab33 1276 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
be_bryan 0:b74591d5ab33 1277 {
be_bryan 0:b74591d5ab33 1278 mbedtls_pem_free( &pem );
be_bryan 0:b74591d5ab33 1279 return( ret );
be_bryan 0:b74591d5ab33 1280 }
be_bryan 0:b74591d5ab33 1281 #endif /* MBEDTLS_PEM_PARSE_C */
be_bryan 0:b74591d5ab33 1282 p = (unsigned char *) key;
be_bryan 0:b74591d5ab33 1283
be_bryan 0:b74591d5ab33 1284 ret = mbedtls_pk_parse_subpubkey( &p, p + keylen, ctx );
be_bryan 0:b74591d5ab33 1285
be_bryan 0:b74591d5ab33 1286 #if defined(MBEDTLS_PEM_PARSE_C)
be_bryan 0:b74591d5ab33 1287 mbedtls_pem_free( &pem );
be_bryan 0:b74591d5ab33 1288 #endif
be_bryan 0:b74591d5ab33 1289
be_bryan 0:b74591d5ab33 1290 return( ret );
be_bryan 0:b74591d5ab33 1291 }
be_bryan 0:b74591d5ab33 1292
be_bryan 0:b74591d5ab33 1293 #endif /* MBEDTLS_PK_PARSE_C */