Austin Blackstone / Mbed 2 deprecated mbed-client-classic-example-lwip

mbed client on ethernet with LWIP

Dependencies:   mbed Socket lwip-eth lwip-sys lwip

Fork of mbed-client-classic-example-lwip by sandbox

mbedtls/source/pkparse.c@11:cada08fc8a70, 2016-06-09 (annotated)

Committer:
mbedAustin
Date:
Thu Jun 09 17:08:36 2016 +0000
Revision:
11:cada08fc8a70
Commit for public Consumption

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbedAustin 11:cada08fc8a70 1 /*
mbedAustin 11:cada08fc8a70 2 * Public Key layer for parsing key files and structures
mbedAustin 11:cada08fc8a70 3 *
mbedAustin 11:cada08fc8a70 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
mbedAustin 11:cada08fc8a70 5 * SPDX-License-Identifier: Apache-2.0
mbedAustin 11:cada08fc8a70 6 *
mbedAustin 11:cada08fc8a70 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
mbedAustin 11:cada08fc8a70 8 * not use this file except in compliance with the License.
mbedAustin 11:cada08fc8a70 9 * You may obtain a copy of the License at
mbedAustin 11:cada08fc8a70 10 *
mbedAustin 11:cada08fc8a70 11 * http://www.apache.org/licenses/LICENSE-2.0
mbedAustin 11:cada08fc8a70 12 *
mbedAustin 11:cada08fc8a70 13 * Unless required by applicable law or agreed to in writing, software
mbedAustin 11:cada08fc8a70 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
mbedAustin 11:cada08fc8a70 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbedAustin 11:cada08fc8a70 16 * See the License for the specific language governing permissions and
mbedAustin 11:cada08fc8a70 17 * limitations under the License.
mbedAustin 11:cada08fc8a70 18 *
mbedAustin 11:cada08fc8a70 19 * This file is part of mbed TLS (https://tls.mbed.org)
mbedAustin 11:cada08fc8a70 20 */
mbedAustin 11:cada08fc8a70 21
mbedAustin 11:cada08fc8a70 22 #if !defined(MBEDTLS_CONFIG_FILE)
mbedAustin 11:cada08fc8a70 23 #include "mbedtls/config.h"
mbedAustin 11:cada08fc8a70 24 #else
mbedAustin 11:cada08fc8a70 25 #include MBEDTLS_CONFIG_FILE
mbedAustin 11:cada08fc8a70 26 #endif
mbedAustin 11:cada08fc8a70 27
mbedAustin 11:cada08fc8a70 28 #if defined(MBEDTLS_PK_PARSE_C)
mbedAustin 11:cada08fc8a70 29
mbedAustin 11:cada08fc8a70 30 #include "mbedtls/pk.h"
mbedAustin 11:cada08fc8a70 31 #include "mbedtls/asn1.h"
mbedAustin 11:cada08fc8a70 32 #include "mbedtls/oid.h"
mbedAustin 11:cada08fc8a70 33
mbedAustin 11:cada08fc8a70 34 #include <string.h>
mbedAustin 11:cada08fc8a70 35
mbedAustin 11:cada08fc8a70 36 #if defined(MBEDTLS_RSA_C)
mbedAustin 11:cada08fc8a70 37 #include "mbedtls/rsa.h"
mbedAustin 11:cada08fc8a70 38 #endif
mbedAustin 11:cada08fc8a70 39 #if defined(MBEDTLS_ECP_C)
mbedAustin 11:cada08fc8a70 40 #include "mbedtls/ecp.h"
mbedAustin 11:cada08fc8a70 41 #endif
mbedAustin 11:cada08fc8a70 42 #if defined(MBEDTLS_ECDSA_C)
mbedAustin 11:cada08fc8a70 43 #include "mbedtls/ecdsa.h"
mbedAustin 11:cada08fc8a70 44 #endif
mbedAustin 11:cada08fc8a70 45 #if defined(MBEDTLS_PEM_PARSE_C)
mbedAustin 11:cada08fc8a70 46 #include "mbedtls/pem.h"
mbedAustin 11:cada08fc8a70 47 #endif
mbedAustin 11:cada08fc8a70 48 #if defined(MBEDTLS_PKCS5_C)
mbedAustin 11:cada08fc8a70 49 #include "mbedtls/pkcs5.h"
mbedAustin 11:cada08fc8a70 50 #endif
mbedAustin 11:cada08fc8a70 51 #if defined(MBEDTLS_PKCS12_C)
mbedAustin 11:cada08fc8a70 52 #include "mbedtls/pkcs12.h"
mbedAustin 11:cada08fc8a70 53 #endif
mbedAustin 11:cada08fc8a70 54
mbedAustin 11:cada08fc8a70 55 #if defined(MBEDTLS_PLATFORM_C)
mbedAustin 11:cada08fc8a70 56 #include "mbedtls/platform.h"
mbedAustin 11:cada08fc8a70 57 #else
mbedAustin 11:cada08fc8a70 58 #include <stdlib.h>
mbedAustin 11:cada08fc8a70 59 #define mbedtls_calloc calloc
mbedAustin 11:cada08fc8a70 60 #define mbedtls_free free
mbedAustin 11:cada08fc8a70 61 #endif
mbedAustin 11:cada08fc8a70 62
mbedAustin 11:cada08fc8a70 63 #if defined(MBEDTLS_FS_IO)
mbedAustin 11:cada08fc8a70 64 /* Implementation that should never be optimized out by the compiler */
mbedAustin 11:cada08fc8a70 65 static void mbedtls_zeroize( void *v, size_t n ) {
mbedAustin 11:cada08fc8a70 66 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
mbedAustin 11:cada08fc8a70 67 }
mbedAustin 11:cada08fc8a70 68
mbedAustin 11:cada08fc8a70 69 /*
mbedAustin 11:cada08fc8a70 70 * Load all data from a file into a given buffer.
mbedAustin 11:cada08fc8a70 71 *
mbedAustin 11:cada08fc8a70 72 * The file is expected to contain either PEM or DER encoded data.
mbedAustin 11:cada08fc8a70 73 * A terminating null byte is always appended. It is included in the announced
mbedAustin 11:cada08fc8a70 74 * length only if the data looks like it is PEM encoded.
mbedAustin 11:cada08fc8a70 75 */
mbedAustin 11:cada08fc8a70 76 int mbedtls_pk_load_file( const char *path, unsigned char **buf, size_t *n )
mbedAustin 11:cada08fc8a70 77 {
mbedAustin 11:cada08fc8a70 78 FILE *f;
mbedAustin 11:cada08fc8a70 79 long size;
mbedAustin 11:cada08fc8a70 80
mbedAustin 11:cada08fc8a70 81 if( ( f = fopen( path, "rb" ) ) == NULL )
mbedAustin 11:cada08fc8a70 82 return( MBEDTLS_ERR_PK_FILE_IO_ERROR );
mbedAustin 11:cada08fc8a70 83
mbedAustin 11:cada08fc8a70 84 fseek( f, 0, SEEK_END );
mbedAustin 11:cada08fc8a70 85 if( ( size = ftell( f ) ) == -1 )
mbedAustin 11:cada08fc8a70 86 {
mbedAustin 11:cada08fc8a70 87 fclose( f );
mbedAustin 11:cada08fc8a70 88 return( MBEDTLS_ERR_PK_FILE_IO_ERROR );
mbedAustin 11:cada08fc8a70 89 }
mbedAustin 11:cada08fc8a70 90 fseek( f, 0, SEEK_SET );
mbedAustin 11:cada08fc8a70 91
mbedAustin 11:cada08fc8a70 92 *n = (size_t) size;
mbedAustin 11:cada08fc8a70 93
mbedAustin 11:cada08fc8a70 94 if( *n + 1 == 0 ||
mbedAustin 11:cada08fc8a70 95 ( *buf = mbedtls_calloc( 1, *n + 1 ) ) == NULL )
mbedAustin 11:cada08fc8a70 96 {
mbedAustin 11:cada08fc8a70 97 fclose( f );
mbedAustin 11:cada08fc8a70 98 return( MBEDTLS_ERR_PK_ALLOC_FAILED );
mbedAustin 11:cada08fc8a70 99 }
mbedAustin 11:cada08fc8a70 100
mbedAustin 11:cada08fc8a70 101 if( fread( *buf, 1, *n, f ) != *n )
mbedAustin 11:cada08fc8a70 102 {
mbedAustin 11:cada08fc8a70 103 fclose( f );
mbedAustin 11:cada08fc8a70 104 mbedtls_free( *buf );
mbedAustin 11:cada08fc8a70 105 return( MBEDTLS_ERR_PK_FILE_IO_ERROR );
mbedAustin 11:cada08fc8a70 106 }
mbedAustin 11:cada08fc8a70 107
mbedAustin 11:cada08fc8a70 108 fclose( f );
mbedAustin 11:cada08fc8a70 109
mbedAustin 11:cada08fc8a70 110 (*buf)[*n] = '\0';
mbedAustin 11:cada08fc8a70 111
mbedAustin 11:cada08fc8a70 112 if( strstr( (const char *) *buf, "-----BEGIN " ) != NULL )
mbedAustin 11:cada08fc8a70 113 ++*n;
mbedAustin 11:cada08fc8a70 114
mbedAustin 11:cada08fc8a70 115 return( 0 );
mbedAustin 11:cada08fc8a70 116 }
mbedAustin 11:cada08fc8a70 117
mbedAustin 11:cada08fc8a70 118 /*
mbedAustin 11:cada08fc8a70 119 * Load and parse a private key
mbedAustin 11:cada08fc8a70 120 */
mbedAustin 11:cada08fc8a70 121 int mbedtls_pk_parse_keyfile( mbedtls_pk_context *ctx,
mbedAustin 11:cada08fc8a70 122 const char *path, const char *pwd )
mbedAustin 11:cada08fc8a70 123 {
mbedAustin 11:cada08fc8a70 124 int ret;
mbedAustin 11:cada08fc8a70 125 size_t n;
mbedAustin 11:cada08fc8a70 126 unsigned char *buf;
mbedAustin 11:cada08fc8a70 127
mbedAustin 11:cada08fc8a70 128 if( ( ret = mbedtls_pk_load_file( path, &buf, &n ) ) != 0 )
mbedAustin 11:cada08fc8a70 129 return( ret );
mbedAustin 11:cada08fc8a70 130
mbedAustin 11:cada08fc8a70 131 if( pwd == NULL )
mbedAustin 11:cada08fc8a70 132 ret = mbedtls_pk_parse_key( ctx, buf, n, NULL, 0 );
mbedAustin 11:cada08fc8a70 133 else
mbedAustin 11:cada08fc8a70 134 ret = mbedtls_pk_parse_key( ctx, buf, n,
mbedAustin 11:cada08fc8a70 135 (const unsigned char *) pwd, strlen( pwd ) );
mbedAustin 11:cada08fc8a70 136
mbedAustin 11:cada08fc8a70 137 mbedtls_zeroize( buf, n );
mbedAustin 11:cada08fc8a70 138 mbedtls_free( buf );
mbedAustin 11:cada08fc8a70 139
mbedAustin 11:cada08fc8a70 140 return( ret );
mbedAustin 11:cada08fc8a70 141 }
mbedAustin 11:cada08fc8a70 142
mbedAustin 11:cada08fc8a70 143 /*
mbedAustin 11:cada08fc8a70 144 * Load and parse a public key
mbedAustin 11:cada08fc8a70 145 */
mbedAustin 11:cada08fc8a70 146 int mbedtls_pk_parse_public_keyfile( mbedtls_pk_context *ctx, const char *path )
mbedAustin 11:cada08fc8a70 147 {
mbedAustin 11:cada08fc8a70 148 int ret;
mbedAustin 11:cada08fc8a70 149 size_t n;
mbedAustin 11:cada08fc8a70 150 unsigned char *buf;
mbedAustin 11:cada08fc8a70 151
mbedAustin 11:cada08fc8a70 152 if( ( ret = mbedtls_pk_load_file( path, &buf, &n ) ) != 0 )
mbedAustin 11:cada08fc8a70 153 return( ret );
mbedAustin 11:cada08fc8a70 154
mbedAustin 11:cada08fc8a70 155 ret = mbedtls_pk_parse_public_key( ctx, buf, n );
mbedAustin 11:cada08fc8a70 156
mbedAustin 11:cada08fc8a70 157 mbedtls_zeroize( buf, n );
mbedAustin 11:cada08fc8a70 158 mbedtls_free( buf );
mbedAustin 11:cada08fc8a70 159
mbedAustin 11:cada08fc8a70 160 return( ret );
mbedAustin 11:cada08fc8a70 161 }
mbedAustin 11:cada08fc8a70 162 #endif /* MBEDTLS_FS_IO */
mbedAustin 11:cada08fc8a70 163
mbedAustin 11:cada08fc8a70 164 #if defined(MBEDTLS_ECP_C)
mbedAustin 11:cada08fc8a70 165 /* Minimally parse an ECParameters buffer to and mbedtls_asn1_buf
mbedAustin 11:cada08fc8a70 166 *
mbedAustin 11:cada08fc8a70 167 * ECParameters ::= CHOICE {
mbedAustin 11:cada08fc8a70 168 * namedCurve OBJECT IDENTIFIER
mbedAustin 11:cada08fc8a70 169 * specifiedCurve SpecifiedECDomain -- = SEQUENCE { ... }
mbedAustin 11:cada08fc8a70 170 * -- implicitCurve NULL
mbedAustin 11:cada08fc8a70 171 * }
mbedAustin 11:cada08fc8a70 172 */
mbedAustin 11:cada08fc8a70 173 static int pk_get_ecparams( unsigned char **p, const unsigned char *end,
mbedAustin 11:cada08fc8a70 174 mbedtls_asn1_buf *params )
mbedAustin 11:cada08fc8a70 175 {
mbedAustin 11:cada08fc8a70 176 int ret;
mbedAustin 11:cada08fc8a70 177
mbedAustin 11:cada08fc8a70 178 /* Tag may be either OID or SEQUENCE */
mbedAustin 11:cada08fc8a70 179 params->tag = **p;
mbedAustin 11:cada08fc8a70 180 if( params->tag != MBEDTLS_ASN1_OID
mbedAustin 11:cada08fc8a70 181 #if defined(MBEDTLS_PK_PARSE_EC_EXTENDED)
mbedAustin 11:cada08fc8a70 182 && params->tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE )
mbedAustin 11:cada08fc8a70 183 #endif
mbedAustin 11:cada08fc8a70 184 )
mbedAustin 11:cada08fc8a70 185 {
mbedAustin 11:cada08fc8a70 186 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
mbedAustin 11:cada08fc8a70 187 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
mbedAustin 11:cada08fc8a70 188 }
mbedAustin 11:cada08fc8a70 189
mbedAustin 11:cada08fc8a70 190 if( ( ret = mbedtls_asn1_get_tag( p, end, &params->len, params->tag ) ) != 0 )
mbedAustin 11:cada08fc8a70 191 {
mbedAustin 11:cada08fc8a70 192 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
mbedAustin 11:cada08fc8a70 193 }
mbedAustin 11:cada08fc8a70 194
mbedAustin 11:cada08fc8a70 195 params->p = *p;
mbedAustin 11:cada08fc8a70 196 *p += params->len;
mbedAustin 11:cada08fc8a70 197
mbedAustin 11:cada08fc8a70 198 if( *p != end )
mbedAustin 11:cada08fc8a70 199 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
mbedAustin 11:cada08fc8a70 200 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
mbedAustin 11:cada08fc8a70 201
mbedAustin 11:cada08fc8a70 202 return( 0 );
mbedAustin 11:cada08fc8a70 203 }
mbedAustin 11:cada08fc8a70 204
mbedAustin 11:cada08fc8a70 205 #if defined(MBEDTLS_PK_PARSE_EC_EXTENDED)
mbedAustin 11:cada08fc8a70 206 /*
mbedAustin 11:cada08fc8a70 207 * Parse a SpecifiedECDomain (SEC 1 C.2) and (mostly) fill the group with it.
mbedAustin 11:cada08fc8a70 208 * WARNING: the resulting group should only be used with
mbedAustin 11:cada08fc8a70 209 * pk_group_id_from_specified(), since its base point may not be set correctly
mbedAustin 11:cada08fc8a70 210 * if it was encoded compressed.
mbedAustin 11:cada08fc8a70 211 *
mbedAustin 11:cada08fc8a70 212 * SpecifiedECDomain ::= SEQUENCE {
mbedAustin 11:cada08fc8a70 213 * version SpecifiedECDomainVersion(ecdpVer1 | ecdpVer2 | ecdpVer3, ...),
mbedAustin 11:cada08fc8a70 214 * fieldID FieldID {{FieldTypes}},
mbedAustin 11:cada08fc8a70 215 * curve Curve,
mbedAustin 11:cada08fc8a70 216 * base ECPoint,
mbedAustin 11:cada08fc8a70 217 * order INTEGER,
mbedAustin 11:cada08fc8a70 218 * cofactor INTEGER OPTIONAL,
mbedAustin 11:cada08fc8a70 219 * hash HashAlgorithm OPTIONAL,
mbedAustin 11:cada08fc8a70 220 * ...
mbedAustin 11:cada08fc8a70 221 * }
mbedAustin 11:cada08fc8a70 222 *
mbedAustin 11:cada08fc8a70 223 * We only support prime-field as field type, and ignore hash and cofactor.
mbedAustin 11:cada08fc8a70 224 */
mbedAustin 11:cada08fc8a70 225 static int pk_group_from_specified( const mbedtls_asn1_buf *params, mbedtls_ecp_group *grp )
mbedAustin 11:cada08fc8a70 226 {
mbedAustin 11:cada08fc8a70 227 int ret;
mbedAustin 11:cada08fc8a70 228 unsigned char *p = params->p;
mbedAustin 11:cada08fc8a70 229 const unsigned char * const end = params->p + params->len;
mbedAustin 11:cada08fc8a70 230 const unsigned char *end_field, *end_curve;
mbedAustin 11:cada08fc8a70 231 size_t len;
mbedAustin 11:cada08fc8a70 232 int ver;
mbedAustin 11:cada08fc8a70 233
mbedAustin 11:cada08fc8a70 234 /* SpecifiedECDomainVersion ::= INTEGER { 1, 2, 3 } */
mbedAustin 11:cada08fc8a70 235 if( ( ret = mbedtls_asn1_get_int( &p, end, &ver ) ) != 0 )
mbedAustin 11:cada08fc8a70 236 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
mbedAustin 11:cada08fc8a70 237
mbedAustin 11:cada08fc8a70 238 if( ver < 1 || ver > 3 )
mbedAustin 11:cada08fc8a70 239 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
mbedAustin 11:cada08fc8a70 240
mbedAustin 11:cada08fc8a70 241 /*
mbedAustin 11:cada08fc8a70 242 * FieldID { FIELD-ID:IOSet } ::= SEQUENCE { -- Finite field
mbedAustin 11:cada08fc8a70 243 * fieldType FIELD-ID.&id({IOSet}),
mbedAustin 11:cada08fc8a70 244 * parameters FIELD-ID.&Type({IOSet}{@fieldType})
mbedAustin 11:cada08fc8a70 245 * }
mbedAustin 11:cada08fc8a70 246 */
mbedAustin 11:cada08fc8a70 247 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
mbedAustin 11:cada08fc8a70 248 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
mbedAustin 11:cada08fc8a70 249 return( ret );
mbedAustin 11:cada08fc8a70 250
mbedAustin 11:cada08fc8a70 251 end_field = p + len;
mbedAustin 11:cada08fc8a70 252
mbedAustin 11:cada08fc8a70 253 /*
mbedAustin 11:cada08fc8a70 254 * FIELD-ID ::= TYPE-IDENTIFIER
mbedAustin 11:cada08fc8a70 255 * FieldTypes FIELD-ID ::= {
mbedAustin 11:cada08fc8a70 256 * { Prime-p IDENTIFIED BY prime-field } |
mbedAustin 11:cada08fc8a70 257 * { Characteristic-two IDENTIFIED BY characteristic-two-field }
mbedAustin 11:cada08fc8a70 258 * }
mbedAustin 11:cada08fc8a70 259 * prime-field OBJECT IDENTIFIER ::= { id-fieldType 1 }
mbedAustin 11:cada08fc8a70 260 */
mbedAustin 11:cada08fc8a70 261 if( ( ret = mbedtls_asn1_get_tag( &p, end_field, &len, MBEDTLS_ASN1_OID ) ) != 0 )
mbedAustin 11:cada08fc8a70 262 return( ret );
mbedAustin 11:cada08fc8a70 263
mbedAustin 11:cada08fc8a70 264 if( len != MBEDTLS_OID_SIZE( MBEDTLS_OID_ANSI_X9_62_PRIME_FIELD ) ||
mbedAustin 11:cada08fc8a70 265 memcmp( p, MBEDTLS_OID_ANSI_X9_62_PRIME_FIELD, len ) != 0 )
mbedAustin 11:cada08fc8a70 266 {
mbedAustin 11:cada08fc8a70 267 return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
mbedAustin 11:cada08fc8a70 268 }
mbedAustin 11:cada08fc8a70 269
mbedAustin 11:cada08fc8a70 270 p += len;
mbedAustin 11:cada08fc8a70 271
mbedAustin 11:cada08fc8a70 272 /* Prime-p ::= INTEGER -- Field of size p. */
mbedAustin 11:cada08fc8a70 273 if( ( ret = mbedtls_asn1_get_mpi( &p, end_field, &grp->P ) ) != 0 )
mbedAustin 11:cada08fc8a70 274 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
mbedAustin 11:cada08fc8a70 275
mbedAustin 11:cada08fc8a70 276 grp->pbits = mbedtls_mpi_bitlen( &grp->P );
mbedAustin 11:cada08fc8a70 277
mbedAustin 11:cada08fc8a70 278 if( p != end_field )
mbedAustin 11:cada08fc8a70 279 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
mbedAustin 11:cada08fc8a70 280 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
mbedAustin 11:cada08fc8a70 281
mbedAustin 11:cada08fc8a70 282 /*
mbedAustin 11:cada08fc8a70 283 * Curve ::= SEQUENCE {
mbedAustin 11:cada08fc8a70 284 * a FieldElement,
mbedAustin 11:cada08fc8a70 285 * b FieldElement,
mbedAustin 11:cada08fc8a70 286 * seed BIT STRING OPTIONAL
mbedAustin 11:cada08fc8a70 287 * -- Shall be present if used in SpecifiedECDomain
mbedAustin 11:cada08fc8a70 288 * -- with version equal to ecdpVer2 or ecdpVer3
mbedAustin 11:cada08fc8a70 289 * }
mbedAustin 11:cada08fc8a70 290 */
mbedAustin 11:cada08fc8a70 291 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
mbedAustin 11:cada08fc8a70 292 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
mbedAustin 11:cada08fc8a70 293 return( ret );
mbedAustin 11:cada08fc8a70 294
mbedAustin 11:cada08fc8a70 295 end_curve = p + len;
mbedAustin 11:cada08fc8a70 296
mbedAustin 11:cada08fc8a70 297 /*
mbedAustin 11:cada08fc8a70 298 * FieldElement ::= OCTET STRING
mbedAustin 11:cada08fc8a70 299 * containing an integer in the case of a prime field
mbedAustin 11:cada08fc8a70 300 */
mbedAustin 11:cada08fc8a70 301 if( ( ret = mbedtls_asn1_get_tag( &p, end_curve, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 ||
mbedAustin 11:cada08fc8a70 302 ( ret = mbedtls_mpi_read_binary( &grp->A, p, len ) ) != 0 )
mbedAustin 11:cada08fc8a70 303 {
mbedAustin 11:cada08fc8a70 304 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
mbedAustin 11:cada08fc8a70 305 }
mbedAustin 11:cada08fc8a70 306
mbedAustin 11:cada08fc8a70 307 p += len;
mbedAustin 11:cada08fc8a70 308
mbedAustin 11:cada08fc8a70 309 if( ( ret = mbedtls_asn1_get_tag( &p, end_curve, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 ||
mbedAustin 11:cada08fc8a70 310 ( ret = mbedtls_mpi_read_binary( &grp->B, p, len ) ) != 0 )
mbedAustin 11:cada08fc8a70 311 {
mbedAustin 11:cada08fc8a70 312 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
mbedAustin 11:cada08fc8a70 313 }
mbedAustin 11:cada08fc8a70 314
mbedAustin 11:cada08fc8a70 315 p += len;
mbedAustin 11:cada08fc8a70 316
mbedAustin 11:cada08fc8a70 317 /* Ignore seed BIT STRING OPTIONAL */
mbedAustin 11:cada08fc8a70 318 if( ( ret = mbedtls_asn1_get_tag( &p, end_curve, &len, MBEDTLS_ASN1_BIT_STRING ) ) == 0 )
mbedAustin 11:cada08fc8a70 319 p += len;
mbedAustin 11:cada08fc8a70 320
mbedAustin 11:cada08fc8a70 321 if( p != end_curve )
mbedAustin 11:cada08fc8a70 322 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
mbedAustin 11:cada08fc8a70 323 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
mbedAustin 11:cada08fc8a70 324
mbedAustin 11:cada08fc8a70 325 /*
mbedAustin 11:cada08fc8a70 326 * ECPoint ::= OCTET STRING
mbedAustin 11:cada08fc8a70 327 */
mbedAustin 11:cada08fc8a70 328 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
mbedAustin 11:cada08fc8a70 329 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
mbedAustin 11:cada08fc8a70 330
mbedAustin 11:cada08fc8a70 331 if( ( ret = mbedtls_ecp_point_read_binary( grp, &grp->G,
mbedAustin 11:cada08fc8a70 332 ( const unsigned char *) p, len ) ) != 0 )
mbedAustin 11:cada08fc8a70 333 {
mbedAustin 11:cada08fc8a70 334 /*
mbedAustin 11:cada08fc8a70 335 * If we can't read the point because it's compressed, cheat by
mbedAustin 11:cada08fc8a70 336 * reading only the X coordinate and the parity bit of Y.
mbedAustin 11:cada08fc8a70 337 */
mbedAustin 11:cada08fc8a70 338 if( ret != MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE ||
mbedAustin 11:cada08fc8a70 339 ( p[0] != 0x02 && p[0] != 0x03 ) ||
mbedAustin 11:cada08fc8a70 340 len != mbedtls_mpi_size( &grp->P ) + 1 ||
mbedAustin 11:cada08fc8a70 341 mbedtls_mpi_read_binary( &grp->G.X, p + 1, len - 1 ) != 0 ||
mbedAustin 11:cada08fc8a70 342 mbedtls_mpi_lset( &grp->G.Y, p[0] - 2 ) != 0 ||
mbedAustin 11:cada08fc8a70 343 mbedtls_mpi_lset( &grp->G.Z, 1 ) != 0 )
mbedAustin 11:cada08fc8a70 344 {
mbedAustin 11:cada08fc8a70 345 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
mbedAustin 11:cada08fc8a70 346 }
mbedAustin 11:cada08fc8a70 347 }
mbedAustin 11:cada08fc8a70 348
mbedAustin 11:cada08fc8a70 349 p += len;
mbedAustin 11:cada08fc8a70 350
mbedAustin 11:cada08fc8a70 351 /*
mbedAustin 11:cada08fc8a70 352 * order INTEGER
mbedAustin 11:cada08fc8a70 353 */
mbedAustin 11:cada08fc8a70 354 if( ( ret = mbedtls_asn1_get_mpi( &p, end, &grp->N ) ) != 0 )
mbedAustin 11:cada08fc8a70 355 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
mbedAustin 11:cada08fc8a70 356
mbedAustin 11:cada08fc8a70 357 grp->nbits = mbedtls_mpi_bitlen( &grp->N );
mbedAustin 11:cada08fc8a70 358
mbedAustin 11:cada08fc8a70 359 /*
mbedAustin 11:cada08fc8a70 360 * Allow optional elements by purposefully not enforcing p == end here.
mbedAustin 11:cada08fc8a70 361 */
mbedAustin 11:cada08fc8a70 362
mbedAustin 11:cada08fc8a70 363 return( 0 );
mbedAustin 11:cada08fc8a70 364 }
mbedAustin 11:cada08fc8a70 365
mbedAustin 11:cada08fc8a70 366 /*
mbedAustin 11:cada08fc8a70 367 * Find the group id associated with an (almost filled) group as generated by
mbedAustin 11:cada08fc8a70 368 * pk_group_from_specified(), or return an error if unknown.
mbedAustin 11:cada08fc8a70 369 */
mbedAustin 11:cada08fc8a70 370 static int pk_group_id_from_group( const mbedtls_ecp_group *grp, mbedtls_ecp_group_id *grp_id )
mbedAustin 11:cada08fc8a70 371 {
mbedAustin 11:cada08fc8a70 372 int ret = 0;
mbedAustin 11:cada08fc8a70 373 mbedtls_ecp_group ref;
mbedAustin 11:cada08fc8a70 374 const mbedtls_ecp_group_id *id;
mbedAustin 11:cada08fc8a70 375
mbedAustin 11:cada08fc8a70 376 mbedtls_ecp_group_init( &ref );
mbedAustin 11:cada08fc8a70 377
mbedAustin 11:cada08fc8a70 378 for( id = mbedtls_ecp_grp_id_list(); *id != MBEDTLS_ECP_DP_NONE; id++ )
mbedAustin 11:cada08fc8a70 379 {
mbedAustin 11:cada08fc8a70 380 /* Load the group associated to that id */
mbedAustin 11:cada08fc8a70 381 mbedtls_ecp_group_free( &ref );
mbedAustin 11:cada08fc8a70 382 MBEDTLS_MPI_CHK( mbedtls_ecp_group_load( &ref, *id ) );
mbedAustin 11:cada08fc8a70 383
mbedAustin 11:cada08fc8a70 384 /* Compare to the group we were given, starting with easy tests */
mbedAustin 11:cada08fc8a70 385 if( grp->pbits == ref.pbits && grp->nbits == ref.nbits &&
mbedAustin 11:cada08fc8a70 386 mbedtls_mpi_cmp_mpi( &grp->P, &ref.P ) == 0 &&
mbedAustin 11:cada08fc8a70 387 mbedtls_mpi_cmp_mpi( &grp->A, &ref.A ) == 0 &&
mbedAustin 11:cada08fc8a70 388 mbedtls_mpi_cmp_mpi( &grp->B, &ref.B ) == 0 &&
mbedAustin 11:cada08fc8a70 389 mbedtls_mpi_cmp_mpi( &grp->N, &ref.N ) == 0 &&
mbedAustin 11:cada08fc8a70 390 mbedtls_mpi_cmp_mpi( &grp->G.X, &ref.G.X ) == 0 &&
mbedAustin 11:cada08fc8a70 391 mbedtls_mpi_cmp_mpi( &grp->G.Z, &ref.G.Z ) == 0 &&
mbedAustin 11:cada08fc8a70 392 /* For Y we may only know the parity bit, so compare only that */
mbedAustin 11:cada08fc8a70 393 mbedtls_mpi_get_bit( &grp->G.Y, 0 ) == mbedtls_mpi_get_bit( &ref.G.Y, 0 ) )
mbedAustin 11:cada08fc8a70 394 {
mbedAustin 11:cada08fc8a70 395 break;
mbedAustin 11:cada08fc8a70 396 }
mbedAustin 11:cada08fc8a70 397
mbedAustin 11:cada08fc8a70 398 }
mbedAustin 11:cada08fc8a70 399
mbedAustin 11:cada08fc8a70 400 cleanup:
mbedAustin 11:cada08fc8a70 401 mbedtls_ecp_group_free( &ref );
mbedAustin 11:cada08fc8a70 402
mbedAustin 11:cada08fc8a70 403 *grp_id = *id;
mbedAustin 11:cada08fc8a70 404
mbedAustin 11:cada08fc8a70 405 if( ret == 0 && *id == MBEDTLS_ECP_DP_NONE )
mbedAustin 11:cada08fc8a70 406 ret = MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE;
mbedAustin 11:cada08fc8a70 407
mbedAustin 11:cada08fc8a70 408 return( ret );
mbedAustin 11:cada08fc8a70 409 }
mbedAustin 11:cada08fc8a70 410
mbedAustin 11:cada08fc8a70 411 /*
mbedAustin 11:cada08fc8a70 412 * Parse a SpecifiedECDomain (SEC 1 C.2) and find the associated group ID
mbedAustin 11:cada08fc8a70 413 */
mbedAustin 11:cada08fc8a70 414 static int pk_group_id_from_specified( const mbedtls_asn1_buf *params,
mbedAustin 11:cada08fc8a70 415 mbedtls_ecp_group_id *grp_id )
mbedAustin 11:cada08fc8a70 416 {
mbedAustin 11:cada08fc8a70 417 int ret;
mbedAustin 11:cada08fc8a70 418 mbedtls_ecp_group grp;
mbedAustin 11:cada08fc8a70 419
mbedAustin 11:cada08fc8a70 420 mbedtls_ecp_group_init( &grp );
mbedAustin 11:cada08fc8a70 421
mbedAustin 11:cada08fc8a70 422 if( ( ret = pk_group_from_specified( params, &grp ) ) != 0 )
mbedAustin 11:cada08fc8a70 423 goto cleanup;
mbedAustin 11:cada08fc8a70 424
mbedAustin 11:cada08fc8a70 425 ret = pk_group_id_from_group( &grp, grp_id );
mbedAustin 11:cada08fc8a70 426
mbedAustin 11:cada08fc8a70 427 cleanup:
mbedAustin 11:cada08fc8a70 428 mbedtls_ecp_group_free( &grp );
mbedAustin 11:cada08fc8a70 429
mbedAustin 11:cada08fc8a70 430 return( ret );
mbedAustin 11:cada08fc8a70 431 }
mbedAustin 11:cada08fc8a70 432 #endif /* MBEDTLS_PK_PARSE_EC_EXTENDED */
mbedAustin 11:cada08fc8a70 433
mbedAustin 11:cada08fc8a70 434 /*
mbedAustin 11:cada08fc8a70 435 * Use EC parameters to initialise an EC group
mbedAustin 11:cada08fc8a70 436 *
mbedAustin 11:cada08fc8a70 437 * ECParameters ::= CHOICE {
mbedAustin 11:cada08fc8a70 438 * namedCurve OBJECT IDENTIFIER
mbedAustin 11:cada08fc8a70 439 * specifiedCurve SpecifiedECDomain -- = SEQUENCE { ... }
mbedAustin 11:cada08fc8a70 440 * -- implicitCurve NULL
mbedAustin 11:cada08fc8a70 441 */
mbedAustin 11:cada08fc8a70 442 static int pk_use_ecparams( const mbedtls_asn1_buf *params, mbedtls_ecp_group *grp )
mbedAustin 11:cada08fc8a70 443 {
mbedAustin 11:cada08fc8a70 444 int ret;
mbedAustin 11:cada08fc8a70 445 mbedtls_ecp_group_id grp_id;
mbedAustin 11:cada08fc8a70 446
mbedAustin 11:cada08fc8a70 447 if( params->tag == MBEDTLS_ASN1_OID )
mbedAustin 11:cada08fc8a70 448 {
mbedAustin 11:cada08fc8a70 449 if( mbedtls_oid_get_ec_grp( params, &grp_id ) != 0 )
mbedAustin 11:cada08fc8a70 450 return( MBEDTLS_ERR_PK_UNKNOWN_NAMED_CURVE );
mbedAustin 11:cada08fc8a70 451 }
mbedAustin 11:cada08fc8a70 452 else
mbedAustin 11:cada08fc8a70 453 {
mbedAustin 11:cada08fc8a70 454 #if defined(MBEDTLS_PK_PARSE_EC_EXTENDED)
mbedAustin 11:cada08fc8a70 455 if( ( ret = pk_group_id_from_specified( params, &grp_id ) ) != 0 )
mbedAustin 11:cada08fc8a70 456 return( ret );
mbedAustin 11:cada08fc8a70 457 #else
mbedAustin 11:cada08fc8a70 458 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
mbedAustin 11:cada08fc8a70 459 #endif
mbedAustin 11:cada08fc8a70 460 }
mbedAustin 11:cada08fc8a70 461
mbedAustin 11:cada08fc8a70 462 /*
mbedAustin 11:cada08fc8a70 463 * grp may already be initilialized; if so, make sure IDs match
mbedAustin 11:cada08fc8a70 464 */
mbedAustin 11:cada08fc8a70 465 if( grp->id != MBEDTLS_ECP_DP_NONE && grp->id != grp_id )
mbedAustin 11:cada08fc8a70 466 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
mbedAustin 11:cada08fc8a70 467
mbedAustin 11:cada08fc8a70 468 if( ( ret = mbedtls_ecp_group_load( grp, grp_id ) ) != 0 )
mbedAustin 11:cada08fc8a70 469 return( ret );
mbedAustin 11:cada08fc8a70 470
mbedAustin 11:cada08fc8a70 471 return( 0 );
mbedAustin 11:cada08fc8a70 472 }
mbedAustin 11:cada08fc8a70 473
mbedAustin 11:cada08fc8a70 474 /*
mbedAustin 11:cada08fc8a70 475 * EC public key is an EC point
mbedAustin 11:cada08fc8a70 476 *
mbedAustin 11:cada08fc8a70 477 * The caller is responsible for clearing the structure upon failure if
mbedAustin 11:cada08fc8a70 478 * desired. Take care to pass along the possible ECP_FEATURE_UNAVAILABLE
mbedAustin 11:cada08fc8a70 479 * return code of mbedtls_ecp_point_read_binary() and leave p in a usable state.
mbedAustin 11:cada08fc8a70 480 */
mbedAustin 11:cada08fc8a70 481 static int pk_get_ecpubkey( unsigned char **p, const unsigned char *end,
mbedAustin 11:cada08fc8a70 482 mbedtls_ecp_keypair *key )
mbedAustin 11:cada08fc8a70 483 {
mbedAustin 11:cada08fc8a70 484 int ret;
mbedAustin 11:cada08fc8a70 485
mbedAustin 11:cada08fc8a70 486 if( ( ret = mbedtls_ecp_point_read_binary( &key->grp, &key->Q,
mbedAustin 11:cada08fc8a70 487 (const unsigned char *) *p, end - *p ) ) == 0 )
mbedAustin 11:cada08fc8a70 488 {
mbedAustin 11:cada08fc8a70 489 ret = mbedtls_ecp_check_pubkey( &key->grp, &key->Q );
mbedAustin 11:cada08fc8a70 490 }
mbedAustin 11:cada08fc8a70 491
mbedAustin 11:cada08fc8a70 492 /*
mbedAustin 11:cada08fc8a70 493 * We know mbedtls_ecp_point_read_binary consumed all bytes or failed
mbedAustin 11:cada08fc8a70 494 */
mbedAustin 11:cada08fc8a70 495 *p = (unsigned char *) end;
mbedAustin 11:cada08fc8a70 496
mbedAustin 11:cada08fc8a70 497 return( ret );
mbedAustin 11:cada08fc8a70 498 }
mbedAustin 11:cada08fc8a70 499 #endif /* MBEDTLS_ECP_C */
mbedAustin 11:cada08fc8a70 500
mbedAustin 11:cada08fc8a70 501 #if defined(MBEDTLS_RSA_C)
mbedAustin 11:cada08fc8a70 502 /*
mbedAustin 11:cada08fc8a70 503 * RSAPublicKey ::= SEQUENCE {
mbedAustin 11:cada08fc8a70 504 * modulus INTEGER, -- n
mbedAustin 11:cada08fc8a70 505 * publicExponent INTEGER -- e
mbedAustin 11:cada08fc8a70 506 * }
mbedAustin 11:cada08fc8a70 507 */
mbedAustin 11:cada08fc8a70 508 static int pk_get_rsapubkey( unsigned char **p,
mbedAustin 11:cada08fc8a70 509 const unsigned char *end,
mbedAustin 11:cada08fc8a70 510 mbedtls_rsa_context *rsa )
mbedAustin 11:cada08fc8a70 511 {
mbedAustin 11:cada08fc8a70 512 int ret;
mbedAustin 11:cada08fc8a70 513 size_t len;
mbedAustin 11:cada08fc8a70 514
mbedAustin 11:cada08fc8a70 515 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
mbedAustin 11:cada08fc8a70 516 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
mbedAustin 11:cada08fc8a70 517 return( MBEDTLS_ERR_PK_INVALID_PUBKEY + ret );
mbedAustin 11:cada08fc8a70 518
mbedAustin 11:cada08fc8a70 519 if( *p + len != end )
mbedAustin 11:cada08fc8a70 520 return( MBEDTLS_ERR_PK_INVALID_PUBKEY +
mbedAustin 11:cada08fc8a70 521 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
mbedAustin 11:cada08fc8a70 522
mbedAustin 11:cada08fc8a70 523 if( ( ret = mbedtls_asn1_get_mpi( p, end, &rsa->N ) ) != 0 ||
mbedAustin 11:cada08fc8a70 524 ( ret = mbedtls_asn1_get_mpi( p, end, &rsa->E ) ) != 0 )
mbedAustin 11:cada08fc8a70 525 return( MBEDTLS_ERR_PK_INVALID_PUBKEY + ret );
mbedAustin 11:cada08fc8a70 526
mbedAustin 11:cada08fc8a70 527 if( *p != end )
mbedAustin 11:cada08fc8a70 528 return( MBEDTLS_ERR_PK_INVALID_PUBKEY +
mbedAustin 11:cada08fc8a70 529 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
mbedAustin 11:cada08fc8a70 530
mbedAustin 11:cada08fc8a70 531 if( ( ret = mbedtls_rsa_check_pubkey( rsa ) ) != 0 )
mbedAustin 11:cada08fc8a70 532 return( MBEDTLS_ERR_PK_INVALID_PUBKEY );
mbedAustin 11:cada08fc8a70 533
mbedAustin 11:cada08fc8a70 534 rsa->len = mbedtls_mpi_size( &rsa->N );
mbedAustin 11:cada08fc8a70 535
mbedAustin 11:cada08fc8a70 536 return( 0 );
mbedAustin 11:cada08fc8a70 537 }
mbedAustin 11:cada08fc8a70 538 #endif /* MBEDTLS_RSA_C */
mbedAustin 11:cada08fc8a70 539
mbedAustin 11:cada08fc8a70 540 /* Get a PK algorithm identifier
mbedAustin 11:cada08fc8a70 541 *
mbedAustin 11:cada08fc8a70 542 * AlgorithmIdentifier ::= SEQUENCE {
mbedAustin 11:cada08fc8a70 543 * algorithm OBJECT IDENTIFIER,
mbedAustin 11:cada08fc8a70 544 * parameters ANY DEFINED BY algorithm OPTIONAL }
mbedAustin 11:cada08fc8a70 545 */
mbedAustin 11:cada08fc8a70 546 static int pk_get_pk_alg( unsigned char **p,
mbedAustin 11:cada08fc8a70 547 const unsigned char *end,
mbedAustin 11:cada08fc8a70 548 mbedtls_pk_type_t *pk_alg, mbedtls_asn1_buf *params )
mbedAustin 11:cada08fc8a70 549 {
mbedAustin 11:cada08fc8a70 550 int ret;
mbedAustin 11:cada08fc8a70 551 mbedtls_asn1_buf alg_oid;
mbedAustin 11:cada08fc8a70 552
mbedAustin 11:cada08fc8a70 553 memset( params, 0, sizeof(mbedtls_asn1_buf) );
mbedAustin 11:cada08fc8a70 554
mbedAustin 11:cada08fc8a70 555 if( ( ret = mbedtls_asn1_get_alg( p, end, &alg_oid, params ) ) != 0 )
mbedAustin 11:cada08fc8a70 556 return( MBEDTLS_ERR_PK_INVALID_ALG + ret );
mbedAustin 11:cada08fc8a70 557
mbedAustin 11:cada08fc8a70 558 if( mbedtls_oid_get_pk_alg( &alg_oid, pk_alg ) != 0 )
mbedAustin 11:cada08fc8a70 559 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
mbedAustin 11:cada08fc8a70 560
mbedAustin 11:cada08fc8a70 561 /*
mbedAustin 11:cada08fc8a70 562 * No parameters with RSA (only for EC)
mbedAustin 11:cada08fc8a70 563 */
mbedAustin 11:cada08fc8a70 564 if( *pk_alg == MBEDTLS_PK_RSA &&
mbedAustin 11:cada08fc8a70 565 ( ( params->tag != MBEDTLS_ASN1_NULL && params->tag != 0 ) ||
mbedAustin 11:cada08fc8a70 566 params->len != 0 ) )
mbedAustin 11:cada08fc8a70 567 {
mbedAustin 11:cada08fc8a70 568 return( MBEDTLS_ERR_PK_INVALID_ALG );
mbedAustin 11:cada08fc8a70 569 }
mbedAustin 11:cada08fc8a70 570
mbedAustin 11:cada08fc8a70 571 return( 0 );
mbedAustin 11:cada08fc8a70 572 }
mbedAustin 11:cada08fc8a70 573
mbedAustin 11:cada08fc8a70 574 /*
mbedAustin 11:cada08fc8a70 575 * SubjectPublicKeyInfo ::= SEQUENCE {
mbedAustin 11:cada08fc8a70 576 * algorithm AlgorithmIdentifier,
mbedAustin 11:cada08fc8a70 577 * subjectPublicKey BIT STRING }
mbedAustin 11:cada08fc8a70 578 */
mbedAustin 11:cada08fc8a70 579 int mbedtls_pk_parse_subpubkey( unsigned char **p, const unsigned char *end,
mbedAustin 11:cada08fc8a70 580 mbedtls_pk_context *pk )
mbedAustin 11:cada08fc8a70 581 {
mbedAustin 11:cada08fc8a70 582 int ret;
mbedAustin 11:cada08fc8a70 583 size_t len;
mbedAustin 11:cada08fc8a70 584 mbedtls_asn1_buf alg_params;
mbedAustin 11:cada08fc8a70 585 mbedtls_pk_type_t pk_alg = MBEDTLS_PK_NONE;
mbedAustin 11:cada08fc8a70 586 const mbedtls_pk_info_t *pk_info;
mbedAustin 11:cada08fc8a70 587
mbedAustin 11:cada08fc8a70 588 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
mbedAustin 11:cada08fc8a70 589 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
mbedAustin 11:cada08fc8a70 590 {
mbedAustin 11:cada08fc8a70 591 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
mbedAustin 11:cada08fc8a70 592 }
mbedAustin 11:cada08fc8a70 593
mbedAustin 11:cada08fc8a70 594 end = *p + len;
mbedAustin 11:cada08fc8a70 595
mbedAustin 11:cada08fc8a70 596 if( ( ret = pk_get_pk_alg( p, end, &pk_alg, &alg_params ) ) != 0 )
mbedAustin 11:cada08fc8a70 597 return( ret );
mbedAustin 11:cada08fc8a70 598
mbedAustin 11:cada08fc8a70 599 if( ( ret = mbedtls_asn1_get_bitstring_null( p, end, &len ) ) != 0 )
mbedAustin 11:cada08fc8a70 600 return( MBEDTLS_ERR_PK_INVALID_PUBKEY + ret );
mbedAustin 11:cada08fc8a70 601
mbedAustin 11:cada08fc8a70 602 if( *p + len != end )
mbedAustin 11:cada08fc8a70 603 return( MBEDTLS_ERR_PK_INVALID_PUBKEY +
mbedAustin 11:cada08fc8a70 604 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
mbedAustin 11:cada08fc8a70 605
mbedAustin 11:cada08fc8a70 606 if( ( pk_info = mbedtls_pk_info_from_type( pk_alg ) ) == NULL )
mbedAustin 11:cada08fc8a70 607 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
mbedAustin 11:cada08fc8a70 608
mbedAustin 11:cada08fc8a70 609 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 )
mbedAustin 11:cada08fc8a70 610 return( ret );
mbedAustin 11:cada08fc8a70 611
mbedAustin 11:cada08fc8a70 612 #if defined(MBEDTLS_RSA_C)
mbedAustin 11:cada08fc8a70 613 if( pk_alg == MBEDTLS_PK_RSA )
mbedAustin 11:cada08fc8a70 614 {
mbedAustin 11:cada08fc8a70 615 ret = pk_get_rsapubkey( p, end, mbedtls_pk_rsa( *pk ) );
mbedAustin 11:cada08fc8a70 616 } else
mbedAustin 11:cada08fc8a70 617 #endif /* MBEDTLS_RSA_C */
mbedAustin 11:cada08fc8a70 618 #if defined(MBEDTLS_ECP_C)
mbedAustin 11:cada08fc8a70 619 if( pk_alg == MBEDTLS_PK_ECKEY_DH || pk_alg == MBEDTLS_PK_ECKEY )
mbedAustin 11:cada08fc8a70 620 {
mbedAustin 11:cada08fc8a70 621 ret = pk_use_ecparams( &alg_params, &mbedtls_pk_ec( *pk )->grp );
mbedAustin 11:cada08fc8a70 622 if( ret == 0 )
mbedAustin 11:cada08fc8a70 623 ret = pk_get_ecpubkey( p, end, mbedtls_pk_ec( *pk ) );
mbedAustin 11:cada08fc8a70 624 } else
mbedAustin 11:cada08fc8a70 625 #endif /* MBEDTLS_ECP_C */
mbedAustin 11:cada08fc8a70 626 ret = MBEDTLS_ERR_PK_UNKNOWN_PK_ALG;
mbedAustin 11:cada08fc8a70 627
mbedAustin 11:cada08fc8a70 628 if( ret == 0 && *p != end )
mbedAustin 11:cada08fc8a70 629 ret = MBEDTLS_ERR_PK_INVALID_PUBKEY
mbedAustin 11:cada08fc8a70 630 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH;
mbedAustin 11:cada08fc8a70 631
mbedAustin 11:cada08fc8a70 632 if( ret != 0 )
mbedAustin 11:cada08fc8a70 633 mbedtls_pk_free( pk );
mbedAustin 11:cada08fc8a70 634
mbedAustin 11:cada08fc8a70 635 return( ret );
mbedAustin 11:cada08fc8a70 636 }
mbedAustin 11:cada08fc8a70 637
mbedAustin 11:cada08fc8a70 638 #if defined(MBEDTLS_RSA_C)
mbedAustin 11:cada08fc8a70 639 /*
mbedAustin 11:cada08fc8a70 640 * Parse a PKCS#1 encoded private RSA key
mbedAustin 11:cada08fc8a70 641 */
mbedAustin 11:cada08fc8a70 642 static int pk_parse_key_pkcs1_der( mbedtls_rsa_context *rsa,
mbedAustin 11:cada08fc8a70 643 const unsigned char *key,
mbedAustin 11:cada08fc8a70 644 size_t keylen )
mbedAustin 11:cada08fc8a70 645 {
mbedAustin 11:cada08fc8a70 646 int ret;
mbedAustin 11:cada08fc8a70 647 size_t len;
mbedAustin 11:cada08fc8a70 648 unsigned char *p, *end;
mbedAustin 11:cada08fc8a70 649
mbedAustin 11:cada08fc8a70 650 p = (unsigned char *) key;
mbedAustin 11:cada08fc8a70 651 end = p + keylen;
mbedAustin 11:cada08fc8a70 652
mbedAustin 11:cada08fc8a70 653 /*
mbedAustin 11:cada08fc8a70 654 * This function parses the RSAPrivateKey (PKCS#1)
mbedAustin 11:cada08fc8a70 655 *
mbedAustin 11:cada08fc8a70 656 * RSAPrivateKey ::= SEQUENCE {
mbedAustin 11:cada08fc8a70 657 * version Version,
mbedAustin 11:cada08fc8a70 658 * modulus INTEGER, -- n
mbedAustin 11:cada08fc8a70 659 * publicExponent INTEGER, -- e
mbedAustin 11:cada08fc8a70 660 * privateExponent INTEGER, -- d
mbedAustin 11:cada08fc8a70 661 * prime1 INTEGER, -- p
mbedAustin 11:cada08fc8a70 662 * prime2 INTEGER, -- q
mbedAustin 11:cada08fc8a70 663 * exponent1 INTEGER, -- d mod (p-1)
mbedAustin 11:cada08fc8a70 664 * exponent2 INTEGER, -- d mod (q-1)
mbedAustin 11:cada08fc8a70 665 * coefficient INTEGER, -- (inverse of q) mod p
mbedAustin 11:cada08fc8a70 666 * otherPrimeInfos OtherPrimeInfos OPTIONAL
mbedAustin 11:cada08fc8a70 667 * }
mbedAustin 11:cada08fc8a70 668 */
mbedAustin 11:cada08fc8a70 669 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
mbedAustin 11:cada08fc8a70 670 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
mbedAustin 11:cada08fc8a70 671 {
mbedAustin 11:cada08fc8a70 672 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
mbedAustin 11:cada08fc8a70 673 }
mbedAustin 11:cada08fc8a70 674
mbedAustin 11:cada08fc8a70 675 end = p + len;
mbedAustin 11:cada08fc8a70 676
mbedAustin 11:cada08fc8a70 677 if( ( ret = mbedtls_asn1_get_int( &p, end, &rsa->ver ) ) != 0 )
mbedAustin 11:cada08fc8a70 678 {
mbedAustin 11:cada08fc8a70 679 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
mbedAustin 11:cada08fc8a70 680 }
mbedAustin 11:cada08fc8a70 681
mbedAustin 11:cada08fc8a70 682 if( rsa->ver != 0 )
mbedAustin 11:cada08fc8a70 683 {
mbedAustin 11:cada08fc8a70 684 return( MBEDTLS_ERR_PK_KEY_INVALID_VERSION );
mbedAustin 11:cada08fc8a70 685 }
mbedAustin 11:cada08fc8a70 686
mbedAustin 11:cada08fc8a70 687 if( ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->N ) ) != 0 ||
mbedAustin 11:cada08fc8a70 688 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->E ) ) != 0 ||
mbedAustin 11:cada08fc8a70 689 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->D ) ) != 0 ||
mbedAustin 11:cada08fc8a70 690 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->P ) ) != 0 ||
mbedAustin 11:cada08fc8a70 691 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->Q ) ) != 0 ||
mbedAustin 11:cada08fc8a70 692 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->DP ) ) != 0 ||
mbedAustin 11:cada08fc8a70 693 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->DQ ) ) != 0 ||
mbedAustin 11:cada08fc8a70 694 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->QP ) ) != 0 )
mbedAustin 11:cada08fc8a70 695 {
mbedAustin 11:cada08fc8a70 696 mbedtls_rsa_free( rsa );
mbedAustin 11:cada08fc8a70 697 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
mbedAustin 11:cada08fc8a70 698 }
mbedAustin 11:cada08fc8a70 699
mbedAustin 11:cada08fc8a70 700 rsa->len = mbedtls_mpi_size( &rsa->N );
mbedAustin 11:cada08fc8a70 701
mbedAustin 11:cada08fc8a70 702 if( p != end )
mbedAustin 11:cada08fc8a70 703 {
mbedAustin 11:cada08fc8a70 704 mbedtls_rsa_free( rsa );
mbedAustin 11:cada08fc8a70 705 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
mbedAustin 11:cada08fc8a70 706 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
mbedAustin 11:cada08fc8a70 707 }
mbedAustin 11:cada08fc8a70 708
mbedAustin 11:cada08fc8a70 709 if( ( ret = mbedtls_rsa_check_privkey( rsa ) ) != 0 )
mbedAustin 11:cada08fc8a70 710 {
mbedAustin 11:cada08fc8a70 711 mbedtls_rsa_free( rsa );
mbedAustin 11:cada08fc8a70 712 return( ret );
mbedAustin 11:cada08fc8a70 713 }
mbedAustin 11:cada08fc8a70 714
mbedAustin 11:cada08fc8a70 715 return( 0 );
mbedAustin 11:cada08fc8a70 716 }
mbedAustin 11:cada08fc8a70 717 #endif /* MBEDTLS_RSA_C */
mbedAustin 11:cada08fc8a70 718
mbedAustin 11:cada08fc8a70 719 #if defined(MBEDTLS_ECP_C)
mbedAustin 11:cada08fc8a70 720 /*
mbedAustin 11:cada08fc8a70 721 * Parse a SEC1 encoded private EC key
mbedAustin 11:cada08fc8a70 722 */
mbedAustin 11:cada08fc8a70 723 static int pk_parse_key_sec1_der( mbedtls_ecp_keypair *eck,
mbedAustin 11:cada08fc8a70 724 const unsigned char *key,
mbedAustin 11:cada08fc8a70 725 size_t keylen )
mbedAustin 11:cada08fc8a70 726 {
mbedAustin 11:cada08fc8a70 727 int ret;
mbedAustin 11:cada08fc8a70 728 int version, pubkey_done;
mbedAustin 11:cada08fc8a70 729 size_t len;
mbedAustin 11:cada08fc8a70 730 mbedtls_asn1_buf params;
mbedAustin 11:cada08fc8a70 731 unsigned char *p = (unsigned char *) key;
mbedAustin 11:cada08fc8a70 732 unsigned char *end = p + keylen;
mbedAustin 11:cada08fc8a70 733 unsigned char *end2;
mbedAustin 11:cada08fc8a70 734
mbedAustin 11:cada08fc8a70 735 /*
mbedAustin 11:cada08fc8a70 736 * RFC 5915, or SEC1 Appendix C.4
mbedAustin 11:cada08fc8a70 737 *
mbedAustin 11:cada08fc8a70 738 * ECPrivateKey ::= SEQUENCE {
mbedAustin 11:cada08fc8a70 739 * version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
mbedAustin 11:cada08fc8a70 740 * privateKey OCTET STRING,
mbedAustin 11:cada08fc8a70 741 * parameters [0] ECParameters {{ NamedCurve }} OPTIONAL,
mbedAustin 11:cada08fc8a70 742 * publicKey [1] BIT STRING OPTIONAL
mbedAustin 11:cada08fc8a70 743 * }
mbedAustin 11:cada08fc8a70 744 */
mbedAustin 11:cada08fc8a70 745 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
mbedAustin 11:cada08fc8a70 746 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
mbedAustin 11:cada08fc8a70 747 {
mbedAustin 11:cada08fc8a70 748 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
mbedAustin 11:cada08fc8a70 749 }
mbedAustin 11:cada08fc8a70 750
mbedAustin 11:cada08fc8a70 751 end = p + len;
mbedAustin 11:cada08fc8a70 752
mbedAustin 11:cada08fc8a70 753 if( ( ret = mbedtls_asn1_get_int( &p, end, &version ) ) != 0 )
mbedAustin 11:cada08fc8a70 754 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
mbedAustin 11:cada08fc8a70 755
mbedAustin 11:cada08fc8a70 756 if( version != 1 )
mbedAustin 11:cada08fc8a70 757 return( MBEDTLS_ERR_PK_KEY_INVALID_VERSION );
mbedAustin 11:cada08fc8a70 758
mbedAustin 11:cada08fc8a70 759 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
mbedAustin 11:cada08fc8a70 760 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
mbedAustin 11:cada08fc8a70 761
mbedAustin 11:cada08fc8a70 762 if( ( ret = mbedtls_mpi_read_binary( &eck->d, p, len ) ) != 0 )
mbedAustin 11:cada08fc8a70 763 {
mbedAustin 11:cada08fc8a70 764 mbedtls_ecp_keypair_free( eck );
mbedAustin 11:cada08fc8a70 765 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
mbedAustin 11:cada08fc8a70 766 }
mbedAustin 11:cada08fc8a70 767
mbedAustin 11:cada08fc8a70 768 p += len;
mbedAustin 11:cada08fc8a70 769
mbedAustin 11:cada08fc8a70 770 pubkey_done = 0;
mbedAustin 11:cada08fc8a70 771 if( p != end )
mbedAustin 11:cada08fc8a70 772 {
mbedAustin 11:cada08fc8a70 773 /*
mbedAustin 11:cada08fc8a70 774 * Is 'parameters' present?
mbedAustin 11:cada08fc8a70 775 */
mbedAustin 11:cada08fc8a70 776 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
mbedAustin 11:cada08fc8a70 777 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 0 ) ) == 0 )
mbedAustin 11:cada08fc8a70 778 {
mbedAustin 11:cada08fc8a70 779 if( ( ret = pk_get_ecparams( &p, p + len, &params) ) != 0 ||
mbedAustin 11:cada08fc8a70 780 ( ret = pk_use_ecparams( &params, &eck->grp ) ) != 0 )
mbedAustin 11:cada08fc8a70 781 {
mbedAustin 11:cada08fc8a70 782 mbedtls_ecp_keypair_free( eck );
mbedAustin 11:cada08fc8a70 783 return( ret );
mbedAustin 11:cada08fc8a70 784 }
mbedAustin 11:cada08fc8a70 785 }
mbedAustin 11:cada08fc8a70 786 else if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
mbedAustin 11:cada08fc8a70 787 {
mbedAustin 11:cada08fc8a70 788 mbedtls_ecp_keypair_free( eck );
mbedAustin 11:cada08fc8a70 789 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
mbedAustin 11:cada08fc8a70 790 }
mbedAustin 11:cada08fc8a70 791
mbedAustin 11:cada08fc8a70 792 /*
mbedAustin 11:cada08fc8a70 793 * Is 'publickey' present? If not, or if we can't read it (eg because it
mbedAustin 11:cada08fc8a70 794 * is compressed), create it from the private key.
mbedAustin 11:cada08fc8a70 795 */
mbedAustin 11:cada08fc8a70 796 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
mbedAustin 11:cada08fc8a70 797 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 1 ) ) == 0 )
mbedAustin 11:cada08fc8a70 798 {
mbedAustin 11:cada08fc8a70 799 end2 = p + len;
mbedAustin 11:cada08fc8a70 800
mbedAustin 11:cada08fc8a70 801 if( ( ret = mbedtls_asn1_get_bitstring_null( &p, end2, &len ) ) != 0 )
mbedAustin 11:cada08fc8a70 802 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
mbedAustin 11:cada08fc8a70 803
mbedAustin 11:cada08fc8a70 804 if( p + len != end2 )
mbedAustin 11:cada08fc8a70 805 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
mbedAustin 11:cada08fc8a70 806 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
mbedAustin 11:cada08fc8a70 807
mbedAustin 11:cada08fc8a70 808 if( ( ret = pk_get_ecpubkey( &p, end2, eck ) ) == 0 )
mbedAustin 11:cada08fc8a70 809 pubkey_done = 1;
mbedAustin 11:cada08fc8a70 810 else
mbedAustin 11:cada08fc8a70 811 {
mbedAustin 11:cada08fc8a70 812 /*
mbedAustin 11:cada08fc8a70 813 * The only acceptable failure mode of pk_get_ecpubkey() above
mbedAustin 11:cada08fc8a70 814 * is if the point format is not recognized.
mbedAustin 11:cada08fc8a70 815 */
mbedAustin 11:cada08fc8a70 816 if( ret != MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE )
mbedAustin 11:cada08fc8a70 817 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
mbedAustin 11:cada08fc8a70 818 }
mbedAustin 11:cada08fc8a70 819 }
mbedAustin 11:cada08fc8a70 820 else if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
mbedAustin 11:cada08fc8a70 821 {
mbedAustin 11:cada08fc8a70 822 mbedtls_ecp_keypair_free( eck );
mbedAustin 11:cada08fc8a70 823 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
mbedAustin 11:cada08fc8a70 824 }
mbedAustin 11:cada08fc8a70 825 }
mbedAustin 11:cada08fc8a70 826
mbedAustin 11:cada08fc8a70 827 if( ! pubkey_done &&
mbedAustin 11:cada08fc8a70 828 ( ret = mbedtls_ecp_mul( &eck->grp, &eck->Q, &eck->d, &eck->grp.G,
mbedAustin 11:cada08fc8a70 829 NULL, NULL ) ) != 0 )
mbedAustin 11:cada08fc8a70 830 {
mbedAustin 11:cada08fc8a70 831 mbedtls_ecp_keypair_free( eck );
mbedAustin 11:cada08fc8a70 832 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
mbedAustin 11:cada08fc8a70 833 }
mbedAustin 11:cada08fc8a70 834
mbedAustin 11:cada08fc8a70 835 if( ( ret = mbedtls_ecp_check_privkey( &eck->grp, &eck->d ) ) != 0 )
mbedAustin 11:cada08fc8a70 836 {
mbedAustin 11:cada08fc8a70 837 mbedtls_ecp_keypair_free( eck );
mbedAustin 11:cada08fc8a70 838 return( ret );
mbedAustin 11:cada08fc8a70 839 }
mbedAustin 11:cada08fc8a70 840
mbedAustin 11:cada08fc8a70 841 return( 0 );
mbedAustin 11:cada08fc8a70 842 }
mbedAustin 11:cada08fc8a70 843 #endif /* MBEDTLS_ECP_C */
mbedAustin 11:cada08fc8a70 844
mbedAustin 11:cada08fc8a70 845 /*
mbedAustin 11:cada08fc8a70 846 * Parse an unencrypted PKCS#8 encoded private key
mbedAustin 11:cada08fc8a70 847 */
mbedAustin 11:cada08fc8a70 848 static int pk_parse_key_pkcs8_unencrypted_der(
mbedAustin 11:cada08fc8a70 849 mbedtls_pk_context *pk,
mbedAustin 11:cada08fc8a70 850 const unsigned char* key,
mbedAustin 11:cada08fc8a70 851 size_t keylen )
mbedAustin 11:cada08fc8a70 852 {
mbedAustin 11:cada08fc8a70 853 int ret, version;
mbedAustin 11:cada08fc8a70 854 size_t len;
mbedAustin 11:cada08fc8a70 855 mbedtls_asn1_buf params;
mbedAustin 11:cada08fc8a70 856 unsigned char *p = (unsigned char *) key;
mbedAustin 11:cada08fc8a70 857 unsigned char *end = p + keylen;
mbedAustin 11:cada08fc8a70 858 mbedtls_pk_type_t pk_alg = MBEDTLS_PK_NONE;
mbedAustin 11:cada08fc8a70 859 const mbedtls_pk_info_t *pk_info;
mbedAustin 11:cada08fc8a70 860
mbedAustin 11:cada08fc8a70 861 /*
mbedAustin 11:cada08fc8a70 862 * This function parses the PrivatKeyInfo object (PKCS#8 v1.2 = RFC 5208)
mbedAustin 11:cada08fc8a70 863 *
mbedAustin 11:cada08fc8a70 864 * PrivateKeyInfo ::= SEQUENCE {
mbedAustin 11:cada08fc8a70 865 * version Version,
mbedAustin 11:cada08fc8a70 866 * privateKeyAlgorithm PrivateKeyAlgorithmIdentifier,
mbedAustin 11:cada08fc8a70 867 * privateKey PrivateKey,
mbedAustin 11:cada08fc8a70 868 * attributes [0] IMPLICIT Attributes OPTIONAL }
mbedAustin 11:cada08fc8a70 869 *
mbedAustin 11:cada08fc8a70 870 * Version ::= INTEGER
mbedAustin 11:cada08fc8a70 871 * PrivateKeyAlgorithmIdentifier ::= AlgorithmIdentifier
mbedAustin 11:cada08fc8a70 872 * PrivateKey ::= OCTET STRING
mbedAustin 11:cada08fc8a70 873 *
mbedAustin 11:cada08fc8a70 874 * The PrivateKey OCTET STRING is a SEC1 ECPrivateKey
mbedAustin 11:cada08fc8a70 875 */
mbedAustin 11:cada08fc8a70 876
mbedAustin 11:cada08fc8a70 877 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
mbedAustin 11:cada08fc8a70 878 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
mbedAustin 11:cada08fc8a70 879 {
mbedAustin 11:cada08fc8a70 880 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
mbedAustin 11:cada08fc8a70 881 }
mbedAustin 11:cada08fc8a70 882
mbedAustin 11:cada08fc8a70 883 end = p + len;
mbedAustin 11:cada08fc8a70 884
mbedAustin 11:cada08fc8a70 885 if( ( ret = mbedtls_asn1_get_int( &p, end, &version ) ) != 0 )
mbedAustin 11:cada08fc8a70 886 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
mbedAustin 11:cada08fc8a70 887
mbedAustin 11:cada08fc8a70 888 if( version != 0 )
mbedAustin 11:cada08fc8a70 889 return( MBEDTLS_ERR_PK_KEY_INVALID_VERSION + ret );
mbedAustin 11:cada08fc8a70 890
mbedAustin 11:cada08fc8a70 891 if( ( ret = pk_get_pk_alg( &p, end, &pk_alg, &params ) ) != 0 )
mbedAustin 11:cada08fc8a70 892 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
mbedAustin 11:cada08fc8a70 893
mbedAustin 11:cada08fc8a70 894 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
mbedAustin 11:cada08fc8a70 895 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
mbedAustin 11:cada08fc8a70 896
mbedAustin 11:cada08fc8a70 897 if( len < 1 )
mbedAustin 11:cada08fc8a70 898 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
mbedAustin 11:cada08fc8a70 899 MBEDTLS_ERR_ASN1_OUT_OF_DATA );
mbedAustin 11:cada08fc8a70 900
mbedAustin 11:cada08fc8a70 901 if( ( pk_info = mbedtls_pk_info_from_type( pk_alg ) ) == NULL )
mbedAustin 11:cada08fc8a70 902 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
mbedAustin 11:cada08fc8a70 903
mbedAustin 11:cada08fc8a70 904 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 )
mbedAustin 11:cada08fc8a70 905 return( ret );
mbedAustin 11:cada08fc8a70 906
mbedAustin 11:cada08fc8a70 907 #if defined(MBEDTLS_RSA_C)
mbedAustin 11:cada08fc8a70 908 if( pk_alg == MBEDTLS_PK_RSA )
mbedAustin 11:cada08fc8a70 909 {
mbedAustin 11:cada08fc8a70 910 if( ( ret = pk_parse_key_pkcs1_der( mbedtls_pk_rsa( *pk ), p, len ) ) != 0 )
mbedAustin 11:cada08fc8a70 911 {
mbedAustin 11:cada08fc8a70 912 mbedtls_pk_free( pk );
mbedAustin 11:cada08fc8a70 913 return( ret );
mbedAustin 11:cada08fc8a70 914 }
mbedAustin 11:cada08fc8a70 915 } else
mbedAustin 11:cada08fc8a70 916 #endif /* MBEDTLS_RSA_C */
mbedAustin 11:cada08fc8a70 917 #if defined(MBEDTLS_ECP_C)
mbedAustin 11:cada08fc8a70 918 if( pk_alg == MBEDTLS_PK_ECKEY || pk_alg == MBEDTLS_PK_ECKEY_DH )
mbedAustin 11:cada08fc8a70 919 {
mbedAustin 11:cada08fc8a70 920 if( ( ret = pk_use_ecparams( &params, &mbedtls_pk_ec( *pk )->grp ) ) != 0 ||
mbedAustin 11:cada08fc8a70 921 ( ret = pk_parse_key_sec1_der( mbedtls_pk_ec( *pk ), p, len ) ) != 0 )
mbedAustin 11:cada08fc8a70 922 {
mbedAustin 11:cada08fc8a70 923 mbedtls_pk_free( pk );
mbedAustin 11:cada08fc8a70 924 return( ret );
mbedAustin 11:cada08fc8a70 925 }
mbedAustin 11:cada08fc8a70 926 } else
mbedAustin 11:cada08fc8a70 927 #endif /* MBEDTLS_ECP_C */
mbedAustin 11:cada08fc8a70 928 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
mbedAustin 11:cada08fc8a70 929
mbedAustin 11:cada08fc8a70 930 return( 0 );
mbedAustin 11:cada08fc8a70 931 }
mbedAustin 11:cada08fc8a70 932
mbedAustin 11:cada08fc8a70 933 /*
mbedAustin 11:cada08fc8a70 934 * Parse an encrypted PKCS#8 encoded private key
mbedAustin 11:cada08fc8a70 935 */
mbedAustin 11:cada08fc8a70 936 #if defined(MBEDTLS_PKCS12_C) || defined(MBEDTLS_PKCS5_C)
mbedAustin 11:cada08fc8a70 937 static int pk_parse_key_pkcs8_encrypted_der(
mbedAustin 11:cada08fc8a70 938 mbedtls_pk_context *pk,
mbedAustin 11:cada08fc8a70 939 const unsigned char *key, size_t keylen,
mbedAustin 11:cada08fc8a70 940 const unsigned char *pwd, size_t pwdlen )
mbedAustin 11:cada08fc8a70 941 {
mbedAustin 11:cada08fc8a70 942 int ret, decrypted = 0;
mbedAustin 11:cada08fc8a70 943 size_t len;
mbedAustin 11:cada08fc8a70 944 unsigned char buf[2048];
mbedAustin 11:cada08fc8a70 945 unsigned char *p, *end;
mbedAustin 11:cada08fc8a70 946 mbedtls_asn1_buf pbe_alg_oid, pbe_params;
mbedAustin 11:cada08fc8a70 947 #if defined(MBEDTLS_PKCS12_C)
mbedAustin 11:cada08fc8a70 948 mbedtls_cipher_type_t cipher_alg;
mbedAustin 11:cada08fc8a70 949 mbedtls_md_type_t md_alg;
mbedAustin 11:cada08fc8a70 950 #endif
mbedAustin 11:cada08fc8a70 951
mbedAustin 11:cada08fc8a70 952 memset( buf, 0, sizeof( buf ) );
mbedAustin 11:cada08fc8a70 953
mbedAustin 11:cada08fc8a70 954 p = (unsigned char *) key;
mbedAustin 11:cada08fc8a70 955 end = p + keylen;
mbedAustin 11:cada08fc8a70 956
mbedAustin 11:cada08fc8a70 957 if( pwdlen == 0 )
mbedAustin 11:cada08fc8a70 958 return( MBEDTLS_ERR_PK_PASSWORD_REQUIRED );
mbedAustin 11:cada08fc8a70 959
mbedAustin 11:cada08fc8a70 960 /*
mbedAustin 11:cada08fc8a70 961 * This function parses the EncryptedPrivatKeyInfo object (PKCS#8)
mbedAustin 11:cada08fc8a70 962 *
mbedAustin 11:cada08fc8a70 963 * EncryptedPrivateKeyInfo ::= SEQUENCE {
mbedAustin 11:cada08fc8a70 964 * encryptionAlgorithm EncryptionAlgorithmIdentifier,
mbedAustin 11:cada08fc8a70 965 * encryptedData EncryptedData
mbedAustin 11:cada08fc8a70 966 * }
mbedAustin 11:cada08fc8a70 967 *
mbedAustin 11:cada08fc8a70 968 * EncryptionAlgorithmIdentifier ::= AlgorithmIdentifier
mbedAustin 11:cada08fc8a70 969 *
mbedAustin 11:cada08fc8a70 970 * EncryptedData ::= OCTET STRING
mbedAustin 11:cada08fc8a70 971 *
mbedAustin 11:cada08fc8a70 972 * The EncryptedData OCTET STRING is a PKCS#8 PrivateKeyInfo
mbedAustin 11:cada08fc8a70 973 */
mbedAustin 11:cada08fc8a70 974 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
mbedAustin 11:cada08fc8a70 975 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
mbedAustin 11:cada08fc8a70 976 {
mbedAustin 11:cada08fc8a70 977 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
mbedAustin 11:cada08fc8a70 978 }
mbedAustin 11:cada08fc8a70 979
mbedAustin 11:cada08fc8a70 980 end = p + len;
mbedAustin 11:cada08fc8a70 981
mbedAustin 11:cada08fc8a70 982 if( ( ret = mbedtls_asn1_get_alg( &p, end, &pbe_alg_oid, &pbe_params ) ) != 0 )
mbedAustin 11:cada08fc8a70 983 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
mbedAustin 11:cada08fc8a70 984
mbedAustin 11:cada08fc8a70 985 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
mbedAustin 11:cada08fc8a70 986 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
mbedAustin 11:cada08fc8a70 987
mbedAustin 11:cada08fc8a70 988 if( len > sizeof( buf ) )
mbedAustin 11:cada08fc8a70 989 return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
mbedAustin 11:cada08fc8a70 990
mbedAustin 11:cada08fc8a70 991 /*
mbedAustin 11:cada08fc8a70 992 * Decrypt EncryptedData with appropriate PDE
mbedAustin 11:cada08fc8a70 993 */
mbedAustin 11:cada08fc8a70 994 #if defined(MBEDTLS_PKCS12_C)
mbedAustin 11:cada08fc8a70 995 if( mbedtls_oid_get_pkcs12_pbe_alg( &pbe_alg_oid, &md_alg, &cipher_alg ) == 0 )
mbedAustin 11:cada08fc8a70 996 {
mbedAustin 11:cada08fc8a70 997 if( ( ret = mbedtls_pkcs12_pbe( &pbe_params, MBEDTLS_PKCS12_PBE_DECRYPT,
mbedAustin 11:cada08fc8a70 998 cipher_alg, md_alg,
mbedAustin 11:cada08fc8a70 999 pwd, pwdlen, p, len, buf ) ) != 0 )
mbedAustin 11:cada08fc8a70 1000 {
mbedAustin 11:cada08fc8a70 1001 if( ret == MBEDTLS_ERR_PKCS12_PASSWORD_MISMATCH )
mbedAustin 11:cada08fc8a70 1002 return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
mbedAustin 11:cada08fc8a70 1003
mbedAustin 11:cada08fc8a70 1004 return( ret );
mbedAustin 11:cada08fc8a70 1005 }
mbedAustin 11:cada08fc8a70 1006
mbedAustin 11:cada08fc8a70 1007 decrypted = 1;
mbedAustin 11:cada08fc8a70 1008 }
mbedAustin 11:cada08fc8a70 1009 else if( MBEDTLS_OID_CMP( MBEDTLS_OID_PKCS12_PBE_SHA1_RC4_128, &pbe_alg_oid ) == 0 )
mbedAustin 11:cada08fc8a70 1010 {
mbedAustin 11:cada08fc8a70 1011 if( ( ret = mbedtls_pkcs12_pbe_sha1_rc4_128( &pbe_params,
mbedAustin 11:cada08fc8a70 1012 MBEDTLS_PKCS12_PBE_DECRYPT,
mbedAustin 11:cada08fc8a70 1013 pwd, pwdlen,
mbedAustin 11:cada08fc8a70 1014 p, len, buf ) ) != 0 )
mbedAustin 11:cada08fc8a70 1015 {
mbedAustin 11:cada08fc8a70 1016 return( ret );
mbedAustin 11:cada08fc8a70 1017 }
mbedAustin 11:cada08fc8a70 1018
mbedAustin 11:cada08fc8a70 1019 // Best guess for password mismatch when using RC4. If first tag is
mbedAustin 11:cada08fc8a70 1020 // not MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE
mbedAustin 11:cada08fc8a70 1021 //
mbedAustin 11:cada08fc8a70 1022 if( *buf != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) )
mbedAustin 11:cada08fc8a70 1023 return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
mbedAustin 11:cada08fc8a70 1024
mbedAustin 11:cada08fc8a70 1025 decrypted = 1;
mbedAustin 11:cada08fc8a70 1026 }
mbedAustin 11:cada08fc8a70 1027 else
mbedAustin 11:cada08fc8a70 1028 #endif /* MBEDTLS_PKCS12_C */
mbedAustin 11:cada08fc8a70 1029 #if defined(MBEDTLS_PKCS5_C)
mbedAustin 11:cada08fc8a70 1030 if( MBEDTLS_OID_CMP( MBEDTLS_OID_PKCS5_PBES2, &pbe_alg_oid ) == 0 )
mbedAustin 11:cada08fc8a70 1031 {
mbedAustin 11:cada08fc8a70 1032 if( ( ret = mbedtls_pkcs5_pbes2( &pbe_params, MBEDTLS_PKCS5_DECRYPT, pwd, pwdlen,
mbedAustin 11:cada08fc8a70 1033 p, len, buf ) ) != 0 )
mbedAustin 11:cada08fc8a70 1034 {
mbedAustin 11:cada08fc8a70 1035 if( ret == MBEDTLS_ERR_PKCS5_PASSWORD_MISMATCH )
mbedAustin 11:cada08fc8a70 1036 return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
mbedAustin 11:cada08fc8a70 1037
mbedAustin 11:cada08fc8a70 1038 return( ret );
mbedAustin 11:cada08fc8a70 1039 }
mbedAustin 11:cada08fc8a70 1040
mbedAustin 11:cada08fc8a70 1041 decrypted = 1;
mbedAustin 11:cada08fc8a70 1042 }
mbedAustin 11:cada08fc8a70 1043 else
mbedAustin 11:cada08fc8a70 1044 #endif /* MBEDTLS_PKCS5_C */
mbedAustin 11:cada08fc8a70 1045 {
mbedAustin 11:cada08fc8a70 1046 ((void) pwd);
mbedAustin 11:cada08fc8a70 1047 }
mbedAustin 11:cada08fc8a70 1048
mbedAustin 11:cada08fc8a70 1049 if( decrypted == 0 )
mbedAustin 11:cada08fc8a70 1050 return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
mbedAustin 11:cada08fc8a70 1051
mbedAustin 11:cada08fc8a70 1052 return( pk_parse_key_pkcs8_unencrypted_der( pk, buf, len ) );
mbedAustin 11:cada08fc8a70 1053 }
mbedAustin 11:cada08fc8a70 1054 #endif /* MBEDTLS_PKCS12_C || MBEDTLS_PKCS5_C */
mbedAustin 11:cada08fc8a70 1055
mbedAustin 11:cada08fc8a70 1056 /*
mbedAustin 11:cada08fc8a70 1057 * Parse a private key
mbedAustin 11:cada08fc8a70 1058 */
mbedAustin 11:cada08fc8a70 1059 int mbedtls_pk_parse_key( mbedtls_pk_context *pk,
mbedAustin 11:cada08fc8a70 1060 const unsigned char *key, size_t keylen,
mbedAustin 11:cada08fc8a70 1061 const unsigned char *pwd, size_t pwdlen )
mbedAustin 11:cada08fc8a70 1062 {
mbedAustin 11:cada08fc8a70 1063 int ret;
mbedAustin 11:cada08fc8a70 1064 const mbedtls_pk_info_t *pk_info;
mbedAustin 11:cada08fc8a70 1065
mbedAustin 11:cada08fc8a70 1066 #if defined(MBEDTLS_PEM_PARSE_C)
mbedAustin 11:cada08fc8a70 1067 size_t len;
mbedAustin 11:cada08fc8a70 1068 mbedtls_pem_context pem;
mbedAustin 11:cada08fc8a70 1069
mbedAustin 11:cada08fc8a70 1070 mbedtls_pem_init( &pem );
mbedAustin 11:cada08fc8a70 1071
mbedAustin 11:cada08fc8a70 1072 #if defined(MBEDTLS_RSA_C)
mbedAustin 11:cada08fc8a70 1073 /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
mbedAustin 11:cada08fc8a70 1074 if( keylen == 0 || key[keylen - 1] != '\0' )
mbedAustin 11:cada08fc8a70 1075 ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
mbedAustin 11:cada08fc8a70 1076 else
mbedAustin 11:cada08fc8a70 1077 ret = mbedtls_pem_read_buffer( &pem,
mbedAustin 11:cada08fc8a70 1078 "-----BEGIN RSA PRIVATE KEY-----",
mbedAustin 11:cada08fc8a70 1079 "-----END RSA PRIVATE KEY-----",
mbedAustin 11:cada08fc8a70 1080 key, pwd, pwdlen, &len );
mbedAustin 11:cada08fc8a70 1081
mbedAustin 11:cada08fc8a70 1082 if( ret == 0 )
mbedAustin 11:cada08fc8a70 1083 {
mbedAustin 11:cada08fc8a70 1084 if( ( pk_info = mbedtls_pk_info_from_type( MBEDTLS_PK_RSA ) ) == NULL )
mbedAustin 11:cada08fc8a70 1085 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
mbedAustin 11:cada08fc8a70 1086
mbedAustin 11:cada08fc8a70 1087 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 ||
mbedAustin 11:cada08fc8a70 1088 ( ret = pk_parse_key_pkcs1_der( mbedtls_pk_rsa( *pk ),
mbedAustin 11:cada08fc8a70 1089 pem.buf, pem.buflen ) ) != 0 )
mbedAustin 11:cada08fc8a70 1090 {
mbedAustin 11:cada08fc8a70 1091 mbedtls_pk_free( pk );
mbedAustin 11:cada08fc8a70 1092 }
mbedAustin 11:cada08fc8a70 1093
mbedAustin 11:cada08fc8a70 1094 mbedtls_pem_free( &pem );
mbedAustin 11:cada08fc8a70 1095 return( ret );
mbedAustin 11:cada08fc8a70 1096 }
mbedAustin 11:cada08fc8a70 1097 else if( ret == MBEDTLS_ERR_PEM_PASSWORD_MISMATCH )
mbedAustin 11:cada08fc8a70 1098 return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
mbedAustin 11:cada08fc8a70 1099 else if( ret == MBEDTLS_ERR_PEM_PASSWORD_REQUIRED )
mbedAustin 11:cada08fc8a70 1100 return( MBEDTLS_ERR_PK_PASSWORD_REQUIRED );
mbedAustin 11:cada08fc8a70 1101 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
mbedAustin 11:cada08fc8a70 1102 return( ret );
mbedAustin 11:cada08fc8a70 1103 #endif /* MBEDTLS_RSA_C */
mbedAustin 11:cada08fc8a70 1104
mbedAustin 11:cada08fc8a70 1105 #if defined(MBEDTLS_ECP_C)
mbedAustin 11:cada08fc8a70 1106 /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
mbedAustin 11:cada08fc8a70 1107 if( keylen == 0 || key[keylen - 1] != '\0' )
mbedAustin 11:cada08fc8a70 1108 ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
mbedAustin 11:cada08fc8a70 1109 else
mbedAustin 11:cada08fc8a70 1110 ret = mbedtls_pem_read_buffer( &pem,
mbedAustin 11:cada08fc8a70 1111 "-----BEGIN EC PRIVATE KEY-----",
mbedAustin 11:cada08fc8a70 1112 "-----END EC PRIVATE KEY-----",
mbedAustin 11:cada08fc8a70 1113 key, pwd, pwdlen, &len );
mbedAustin 11:cada08fc8a70 1114 if( ret == 0 )
mbedAustin 11:cada08fc8a70 1115 {
mbedAustin 11:cada08fc8a70 1116 if( ( pk_info = mbedtls_pk_info_from_type( MBEDTLS_PK_ECKEY ) ) == NULL )
mbedAustin 11:cada08fc8a70 1117 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
mbedAustin 11:cada08fc8a70 1118
mbedAustin 11:cada08fc8a70 1119 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 ||
mbedAustin 11:cada08fc8a70 1120 ( ret = pk_parse_key_sec1_der( mbedtls_pk_ec( *pk ),
mbedAustin 11:cada08fc8a70 1121 pem.buf, pem.buflen ) ) != 0 )
mbedAustin 11:cada08fc8a70 1122 {
mbedAustin 11:cada08fc8a70 1123 mbedtls_pk_free( pk );
mbedAustin 11:cada08fc8a70 1124 }
mbedAustin 11:cada08fc8a70 1125
mbedAustin 11:cada08fc8a70 1126 mbedtls_pem_free( &pem );
mbedAustin 11:cada08fc8a70 1127 return( ret );
mbedAustin 11:cada08fc8a70 1128 }
mbedAustin 11:cada08fc8a70 1129 else if( ret == MBEDTLS_ERR_PEM_PASSWORD_MISMATCH )
mbedAustin 11:cada08fc8a70 1130 return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
mbedAustin 11:cada08fc8a70 1131 else if( ret == MBEDTLS_ERR_PEM_PASSWORD_REQUIRED )
mbedAustin 11:cada08fc8a70 1132 return( MBEDTLS_ERR_PK_PASSWORD_REQUIRED );
mbedAustin 11:cada08fc8a70 1133 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
mbedAustin 11:cada08fc8a70 1134 return( ret );
mbedAustin 11:cada08fc8a70 1135 #endif /* MBEDTLS_ECP_C */
mbedAustin 11:cada08fc8a70 1136
mbedAustin 11:cada08fc8a70 1137 /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
mbedAustin 11:cada08fc8a70 1138 if( keylen == 0 || key[keylen - 1] != '\0' )
mbedAustin 11:cada08fc8a70 1139 ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
mbedAustin 11:cada08fc8a70 1140 else
mbedAustin 11:cada08fc8a70 1141 ret = mbedtls_pem_read_buffer( &pem,
mbedAustin 11:cada08fc8a70 1142 "-----BEGIN PRIVATE KEY-----",
mbedAustin 11:cada08fc8a70 1143 "-----END PRIVATE KEY-----",
mbedAustin 11:cada08fc8a70 1144 key, NULL, 0, &len );
mbedAustin 11:cada08fc8a70 1145 if( ret == 0 )
mbedAustin 11:cada08fc8a70 1146 {
mbedAustin 11:cada08fc8a70 1147 if( ( ret = pk_parse_key_pkcs8_unencrypted_der( pk,
mbedAustin 11:cada08fc8a70 1148 pem.buf, pem.buflen ) ) != 0 )
mbedAustin 11:cada08fc8a70 1149 {
mbedAustin 11:cada08fc8a70 1150 mbedtls_pk_free( pk );
mbedAustin 11:cada08fc8a70 1151 }
mbedAustin 11:cada08fc8a70 1152
mbedAustin 11:cada08fc8a70 1153 mbedtls_pem_free( &pem );
mbedAustin 11:cada08fc8a70 1154 return( ret );
mbedAustin 11:cada08fc8a70 1155 }
mbedAustin 11:cada08fc8a70 1156 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
mbedAustin 11:cada08fc8a70 1157 return( ret );
mbedAustin 11:cada08fc8a70 1158
mbedAustin 11:cada08fc8a70 1159 #if defined(MBEDTLS_PKCS12_C) || defined(MBEDTLS_PKCS5_C)
mbedAustin 11:cada08fc8a70 1160 /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
mbedAustin 11:cada08fc8a70 1161 if( keylen == 0 || key[keylen - 1] != '\0' )
mbedAustin 11:cada08fc8a70 1162 ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
mbedAustin 11:cada08fc8a70 1163 else
mbedAustin 11:cada08fc8a70 1164 ret = mbedtls_pem_read_buffer( &pem,
mbedAustin 11:cada08fc8a70 1165 "-----BEGIN ENCRYPTED PRIVATE KEY-----",
mbedAustin 11:cada08fc8a70 1166 "-----END ENCRYPTED PRIVATE KEY-----",
mbedAustin 11:cada08fc8a70 1167 key, NULL, 0, &len );
mbedAustin 11:cada08fc8a70 1168 if( ret == 0 )
mbedAustin 11:cada08fc8a70 1169 {
mbedAustin 11:cada08fc8a70 1170 if( ( ret = pk_parse_key_pkcs8_encrypted_der( pk,
mbedAustin 11:cada08fc8a70 1171 pem.buf, pem.buflen,
mbedAustin 11:cada08fc8a70 1172 pwd, pwdlen ) ) != 0 )
mbedAustin 11:cada08fc8a70 1173 {
mbedAustin 11:cada08fc8a70 1174 mbedtls_pk_free( pk );
mbedAustin 11:cada08fc8a70 1175 }
mbedAustin 11:cada08fc8a70 1176
mbedAustin 11:cada08fc8a70 1177 mbedtls_pem_free( &pem );
mbedAustin 11:cada08fc8a70 1178 return( ret );
mbedAustin 11:cada08fc8a70 1179 }
mbedAustin 11:cada08fc8a70 1180 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
mbedAustin 11:cada08fc8a70 1181 return( ret );
mbedAustin 11:cada08fc8a70 1182 #endif /* MBEDTLS_PKCS12_C || MBEDTLS_PKCS5_C */
mbedAustin 11:cada08fc8a70 1183 #else
mbedAustin 11:cada08fc8a70 1184 ((void) ret);
mbedAustin 11:cada08fc8a70 1185 ((void) pwd);
mbedAustin 11:cada08fc8a70 1186 ((void) pwdlen);
mbedAustin 11:cada08fc8a70 1187 #endif /* MBEDTLS_PEM_PARSE_C */
mbedAustin 11:cada08fc8a70 1188
mbedAustin 11:cada08fc8a70 1189 /*
mbedAustin 11:cada08fc8a70 1190 * At this point we only know it's not a PEM formatted key. Could be any
mbedAustin 11:cada08fc8a70 1191 * of the known DER encoded private key formats
mbedAustin 11:cada08fc8a70 1192 *
mbedAustin 11:cada08fc8a70 1193 * We try the different DER format parsers to see if one passes without
mbedAustin 11:cada08fc8a70 1194 * error
mbedAustin 11:cada08fc8a70 1195 */
mbedAustin 11:cada08fc8a70 1196 #if defined(MBEDTLS_PKCS12_C) || defined(MBEDTLS_PKCS5_C)
mbedAustin 11:cada08fc8a70 1197 if( ( ret = pk_parse_key_pkcs8_encrypted_der( pk, key, keylen,
mbedAustin 11:cada08fc8a70 1198 pwd, pwdlen ) ) == 0 )
mbedAustin 11:cada08fc8a70 1199 {
mbedAustin 11:cada08fc8a70 1200 return( 0 );
mbedAustin 11:cada08fc8a70 1201 }
mbedAustin 11:cada08fc8a70 1202
mbedAustin 11:cada08fc8a70 1203 mbedtls_pk_free( pk );
mbedAustin 11:cada08fc8a70 1204
mbedAustin 11:cada08fc8a70 1205 if( ret == MBEDTLS_ERR_PK_PASSWORD_MISMATCH )
mbedAustin 11:cada08fc8a70 1206 {
mbedAustin 11:cada08fc8a70 1207 return( ret );
mbedAustin 11:cada08fc8a70 1208 }
mbedAustin 11:cada08fc8a70 1209 #endif /* MBEDTLS_PKCS12_C || MBEDTLS_PKCS5_C */
mbedAustin 11:cada08fc8a70 1210
mbedAustin 11:cada08fc8a70 1211 if( ( ret = pk_parse_key_pkcs8_unencrypted_der( pk, key, keylen ) ) == 0 )
mbedAustin 11:cada08fc8a70 1212 return( 0 );
mbedAustin 11:cada08fc8a70 1213
mbedAustin 11:cada08fc8a70 1214 mbedtls_pk_free( pk );
mbedAustin 11:cada08fc8a70 1215
mbedAustin 11:cada08fc8a70 1216 #if defined(MBEDTLS_RSA_C)
mbedAustin 11:cada08fc8a70 1217 if( ( pk_info = mbedtls_pk_info_from_type( MBEDTLS_PK_RSA ) ) == NULL )
mbedAustin 11:cada08fc8a70 1218 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
mbedAustin 11:cada08fc8a70 1219
mbedAustin 11:cada08fc8a70 1220 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 ||
mbedAustin 11:cada08fc8a70 1221 ( ret = pk_parse_key_pkcs1_der( mbedtls_pk_rsa( *pk ), key, keylen ) ) == 0 )
mbedAustin 11:cada08fc8a70 1222 {
mbedAustin 11:cada08fc8a70 1223 return( 0 );
mbedAustin 11:cada08fc8a70 1224 }
mbedAustin 11:cada08fc8a70 1225
mbedAustin 11:cada08fc8a70 1226 mbedtls_pk_free( pk );
mbedAustin 11:cada08fc8a70 1227 #endif /* MBEDTLS_RSA_C */
mbedAustin 11:cada08fc8a70 1228
mbedAustin 11:cada08fc8a70 1229 #if defined(MBEDTLS_ECP_C)
mbedAustin 11:cada08fc8a70 1230 if( ( pk_info = mbedtls_pk_info_from_type( MBEDTLS_PK_ECKEY ) ) == NULL )
mbedAustin 11:cada08fc8a70 1231 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
mbedAustin 11:cada08fc8a70 1232
mbedAustin 11:cada08fc8a70 1233 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 ||
mbedAustin 11:cada08fc8a70 1234 ( ret = pk_parse_key_sec1_der( mbedtls_pk_ec( *pk ), key, keylen ) ) == 0 )
mbedAustin 11:cada08fc8a70 1235 {
mbedAustin 11:cada08fc8a70 1236 return( 0 );
mbedAustin 11:cada08fc8a70 1237 }
mbedAustin 11:cada08fc8a70 1238
mbedAustin 11:cada08fc8a70 1239 mbedtls_pk_free( pk );
mbedAustin 11:cada08fc8a70 1240 #endif /* MBEDTLS_ECP_C */
mbedAustin 11:cada08fc8a70 1241
mbedAustin 11:cada08fc8a70 1242 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
mbedAustin 11:cada08fc8a70 1243 }
mbedAustin 11:cada08fc8a70 1244
mbedAustin 11:cada08fc8a70 1245 /*
mbedAustin 11:cada08fc8a70 1246 * Parse a public key
mbedAustin 11:cada08fc8a70 1247 */
mbedAustin 11:cada08fc8a70 1248 int mbedtls_pk_parse_public_key( mbedtls_pk_context *ctx,
mbedAustin 11:cada08fc8a70 1249 const unsigned char *key, size_t keylen )
mbedAustin 11:cada08fc8a70 1250 {
mbedAustin 11:cada08fc8a70 1251 int ret;
mbedAustin 11:cada08fc8a70 1252 unsigned char *p;
mbedAustin 11:cada08fc8a70 1253 #if defined(MBEDTLS_PEM_PARSE_C)
mbedAustin 11:cada08fc8a70 1254 size_t len;
mbedAustin 11:cada08fc8a70 1255 mbedtls_pem_context pem;
mbedAustin 11:cada08fc8a70 1256
mbedAustin 11:cada08fc8a70 1257 mbedtls_pem_init( &pem );
mbedAustin 11:cada08fc8a70 1258
mbedAustin 11:cada08fc8a70 1259 /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
mbedAustin 11:cada08fc8a70 1260 if( keylen == 0 || key[keylen - 1] != '\0' )
mbedAustin 11:cada08fc8a70 1261 ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
mbedAustin 11:cada08fc8a70 1262 else
mbedAustin 11:cada08fc8a70 1263 ret = mbedtls_pem_read_buffer( &pem,
mbedAustin 11:cada08fc8a70 1264 "-----BEGIN PUBLIC KEY-----",
mbedAustin 11:cada08fc8a70 1265 "-----END PUBLIC KEY-----",
mbedAustin 11:cada08fc8a70 1266 key, NULL, 0, &len );
mbedAustin 11:cada08fc8a70 1267
mbedAustin 11:cada08fc8a70 1268 if( ret == 0 )
mbedAustin 11:cada08fc8a70 1269 {
mbedAustin 11:cada08fc8a70 1270 /*
mbedAustin 11:cada08fc8a70 1271 * Was PEM encoded
mbedAustin 11:cada08fc8a70 1272 */
mbedAustin 11:cada08fc8a70 1273 key = pem.buf;
mbedAustin 11:cada08fc8a70 1274 keylen = pem.buflen;
mbedAustin 11:cada08fc8a70 1275 }
mbedAustin 11:cada08fc8a70 1276 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
mbedAustin 11:cada08fc8a70 1277 {
mbedAustin 11:cada08fc8a70 1278 mbedtls_pem_free( &pem );
mbedAustin 11:cada08fc8a70 1279 return( ret );
mbedAustin 11:cada08fc8a70 1280 }
mbedAustin 11:cada08fc8a70 1281 #endif /* MBEDTLS_PEM_PARSE_C */
mbedAustin 11:cada08fc8a70 1282 p = (unsigned char *) key;
mbedAustin 11:cada08fc8a70 1283
mbedAustin 11:cada08fc8a70 1284 ret = mbedtls_pk_parse_subpubkey( &p, p + keylen, ctx );
mbedAustin 11:cada08fc8a70 1285
mbedAustin 11:cada08fc8a70 1286 #if defined(MBEDTLS_PEM_PARSE_C)
mbedAustin 11:cada08fc8a70 1287 mbedtls_pem_free( &pem );
mbedAustin 11:cada08fc8a70 1288 #endif
mbedAustin 11:cada08fc8a70 1289
mbedAustin 11:cada08fc8a70 1290 return( ret );
mbedAustin 11:cada08fc8a70 1291 }
mbedAustin 11:cada08fc8a70 1292
mbedAustin 11:cada08fc8a70 1293 #endif /* MBEDTLS_PK_PARSE_C */