Simon Cooksey / mbed-os

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features/mbedtls/src/pkparse.c@0:fb7af294d5d9, 2016-11-17 (annotated)

Committer:
Simon Cooksey
Date:
Thu Nov 17 16:43:53 2016 +0000
Revision:
0:fb7af294d5d9
Initial commit

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Simon Cooksey 0:fb7af294d5d9 1 /*
Simon Cooksey 0:fb7af294d5d9 2 * Public Key layer for parsing key files and structures
Simon Cooksey 0:fb7af294d5d9 3 *
Simon Cooksey 0:fb7af294d5d9 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
Simon Cooksey 0:fb7af294d5d9 5 * SPDX-License-Identifier: Apache-2.0
Simon Cooksey 0:fb7af294d5d9 6 *
Simon Cooksey 0:fb7af294d5d9 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
Simon Cooksey 0:fb7af294d5d9 8 * not use this file except in compliance with the License.
Simon Cooksey 0:fb7af294d5d9 9 * You may obtain a copy of the License at
Simon Cooksey 0:fb7af294d5d9 10 *
Simon Cooksey 0:fb7af294d5d9 11 * http://www.apache.org/licenses/LICENSE-2.0
Simon Cooksey 0:fb7af294d5d9 12 *
Simon Cooksey 0:fb7af294d5d9 13 * Unless required by applicable law or agreed to in writing, software
Simon Cooksey 0:fb7af294d5d9 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
Simon Cooksey 0:fb7af294d5d9 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
Simon Cooksey 0:fb7af294d5d9 16 * See the License for the specific language governing permissions and
Simon Cooksey 0:fb7af294d5d9 17 * limitations under the License.
Simon Cooksey 0:fb7af294d5d9 18 *
Simon Cooksey 0:fb7af294d5d9 19 * This file is part of mbed TLS (https://tls.mbed.org)
Simon Cooksey 0:fb7af294d5d9 20 */
Simon Cooksey 0:fb7af294d5d9 21
Simon Cooksey 0:fb7af294d5d9 22 #if !defined(MBEDTLS_CONFIG_FILE)
Simon Cooksey 0:fb7af294d5d9 23 #include "mbedtls/config.h"
Simon Cooksey 0:fb7af294d5d9 24 #else
Simon Cooksey 0:fb7af294d5d9 25 #include MBEDTLS_CONFIG_FILE
Simon Cooksey 0:fb7af294d5d9 26 #endif
Simon Cooksey 0:fb7af294d5d9 27
Simon Cooksey 0:fb7af294d5d9 28 #if defined(MBEDTLS_PK_PARSE_C)
Simon Cooksey 0:fb7af294d5d9 29
Simon Cooksey 0:fb7af294d5d9 30 #include "mbedtls/pk.h"
Simon Cooksey 0:fb7af294d5d9 31 #include "mbedtls/asn1.h"
Simon Cooksey 0:fb7af294d5d9 32 #include "mbedtls/oid.h"
Simon Cooksey 0:fb7af294d5d9 33
Simon Cooksey 0:fb7af294d5d9 34 #include <string.h>
Simon Cooksey 0:fb7af294d5d9 35
Simon Cooksey 0:fb7af294d5d9 36 #if defined(MBEDTLS_RSA_C)
Simon Cooksey 0:fb7af294d5d9 37 #include "mbedtls/rsa.h"
Simon Cooksey 0:fb7af294d5d9 38 #endif
Simon Cooksey 0:fb7af294d5d9 39 #if defined(MBEDTLS_ECP_C)
Simon Cooksey 0:fb7af294d5d9 40 #include "mbedtls/ecp.h"
Simon Cooksey 0:fb7af294d5d9 41 #endif
Simon Cooksey 0:fb7af294d5d9 42 #if defined(MBEDTLS_ECDSA_C)
Simon Cooksey 0:fb7af294d5d9 43 #include "mbedtls/ecdsa.h"
Simon Cooksey 0:fb7af294d5d9 44 #endif
Simon Cooksey 0:fb7af294d5d9 45 #if defined(MBEDTLS_PEM_PARSE_C)
Simon Cooksey 0:fb7af294d5d9 46 #include "mbedtls/pem.h"
Simon Cooksey 0:fb7af294d5d9 47 #endif
Simon Cooksey 0:fb7af294d5d9 48 #if defined(MBEDTLS_PKCS5_C)
Simon Cooksey 0:fb7af294d5d9 49 #include "mbedtls/pkcs5.h"
Simon Cooksey 0:fb7af294d5d9 50 #endif
Simon Cooksey 0:fb7af294d5d9 51 #if defined(MBEDTLS_PKCS12_C)
Simon Cooksey 0:fb7af294d5d9 52 #include "mbedtls/pkcs12.h"
Simon Cooksey 0:fb7af294d5d9 53 #endif
Simon Cooksey 0:fb7af294d5d9 54
Simon Cooksey 0:fb7af294d5d9 55 #if defined(MBEDTLS_PLATFORM_C)
Simon Cooksey 0:fb7af294d5d9 56 #include "mbedtls/platform.h"
Simon Cooksey 0:fb7af294d5d9 57 #else
Simon Cooksey 0:fb7af294d5d9 58 #include <stdlib.h>
Simon Cooksey 0:fb7af294d5d9 59 #define mbedtls_calloc calloc
Simon Cooksey 0:fb7af294d5d9 60 #define mbedtls_free free
Simon Cooksey 0:fb7af294d5d9 61 #endif
Simon Cooksey 0:fb7af294d5d9 62
Simon Cooksey 0:fb7af294d5d9 63 #if defined(MBEDTLS_FS_IO)
Simon Cooksey 0:fb7af294d5d9 64 /* Implementation that should never be optimized out by the compiler */
Simon Cooksey 0:fb7af294d5d9 65 static void mbedtls_zeroize( void *v, size_t n ) {
Simon Cooksey 0:fb7af294d5d9 66 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
Simon Cooksey 0:fb7af294d5d9 67 }
Simon Cooksey 0:fb7af294d5d9 68
Simon Cooksey 0:fb7af294d5d9 69 /*
Simon Cooksey 0:fb7af294d5d9 70 * Load all data from a file into a given buffer.
Simon Cooksey 0:fb7af294d5d9 71 *
Simon Cooksey 0:fb7af294d5d9 72 * The file is expected to contain either PEM or DER encoded data.
Simon Cooksey 0:fb7af294d5d9 73 * A terminating null byte is always appended. It is included in the announced
Simon Cooksey 0:fb7af294d5d9 74 * length only if the data looks like it is PEM encoded.
Simon Cooksey 0:fb7af294d5d9 75 */
Simon Cooksey 0:fb7af294d5d9 76 int mbedtls_pk_load_file( const char *path, unsigned char **buf, size_t *n )
Simon Cooksey 0:fb7af294d5d9 77 {
Simon Cooksey 0:fb7af294d5d9 78 FILE *f;
Simon Cooksey 0:fb7af294d5d9 79 long size;
Simon Cooksey 0:fb7af294d5d9 80
Simon Cooksey 0:fb7af294d5d9 81 if( ( f = fopen( path, "rb" ) ) == NULL )
Simon Cooksey 0:fb7af294d5d9 82 return( MBEDTLS_ERR_PK_FILE_IO_ERROR );
Simon Cooksey 0:fb7af294d5d9 83
Simon Cooksey 0:fb7af294d5d9 84 fseek( f, 0, SEEK_END );
Simon Cooksey 0:fb7af294d5d9 85 if( ( size = ftell( f ) ) == -1 )
Simon Cooksey 0:fb7af294d5d9 86 {
Simon Cooksey 0:fb7af294d5d9 87 fclose( f );
Simon Cooksey 0:fb7af294d5d9 88 return( MBEDTLS_ERR_PK_FILE_IO_ERROR );
Simon Cooksey 0:fb7af294d5d9 89 }
Simon Cooksey 0:fb7af294d5d9 90 fseek( f, 0, SEEK_SET );
Simon Cooksey 0:fb7af294d5d9 91
Simon Cooksey 0:fb7af294d5d9 92 *n = (size_t) size;
Simon Cooksey 0:fb7af294d5d9 93
Simon Cooksey 0:fb7af294d5d9 94 if( *n + 1 == 0 ||
Simon Cooksey 0:fb7af294d5d9 95 ( *buf = mbedtls_calloc( 1, *n + 1 ) ) == NULL )
Simon Cooksey 0:fb7af294d5d9 96 {
Simon Cooksey 0:fb7af294d5d9 97 fclose( f );
Simon Cooksey 0:fb7af294d5d9 98 return( MBEDTLS_ERR_PK_ALLOC_FAILED );
Simon Cooksey 0:fb7af294d5d9 99 }
Simon Cooksey 0:fb7af294d5d9 100
Simon Cooksey 0:fb7af294d5d9 101 if( fread( *buf, 1, *n, f ) != *n )
Simon Cooksey 0:fb7af294d5d9 102 {
Simon Cooksey 0:fb7af294d5d9 103 fclose( f );
Simon Cooksey 0:fb7af294d5d9 104 mbedtls_free( *buf );
Simon Cooksey 0:fb7af294d5d9 105 return( MBEDTLS_ERR_PK_FILE_IO_ERROR );
Simon Cooksey 0:fb7af294d5d9 106 }
Simon Cooksey 0:fb7af294d5d9 107
Simon Cooksey 0:fb7af294d5d9 108 fclose( f );
Simon Cooksey 0:fb7af294d5d9 109
Simon Cooksey 0:fb7af294d5d9 110 (*buf)[*n] = '\0';
Simon Cooksey 0:fb7af294d5d9 111
Simon Cooksey 0:fb7af294d5d9 112 if( strstr( (const char *) *buf, "-----BEGIN " ) != NULL )
Simon Cooksey 0:fb7af294d5d9 113 ++*n;
Simon Cooksey 0:fb7af294d5d9 114
Simon Cooksey 0:fb7af294d5d9 115 return( 0 );
Simon Cooksey 0:fb7af294d5d9 116 }
Simon Cooksey 0:fb7af294d5d9 117
Simon Cooksey 0:fb7af294d5d9 118 /*
Simon Cooksey 0:fb7af294d5d9 119 * Load and parse a private key
Simon Cooksey 0:fb7af294d5d9 120 */
Simon Cooksey 0:fb7af294d5d9 121 int mbedtls_pk_parse_keyfile( mbedtls_pk_context *ctx,
Simon Cooksey 0:fb7af294d5d9 122 const char *path, const char *pwd )
Simon Cooksey 0:fb7af294d5d9 123 {
Simon Cooksey 0:fb7af294d5d9 124 int ret;
Simon Cooksey 0:fb7af294d5d9 125 size_t n;
Simon Cooksey 0:fb7af294d5d9 126 unsigned char *buf;
Simon Cooksey 0:fb7af294d5d9 127
Simon Cooksey 0:fb7af294d5d9 128 if( ( ret = mbedtls_pk_load_file( path, &buf, &n ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 129 return( ret );
Simon Cooksey 0:fb7af294d5d9 130
Simon Cooksey 0:fb7af294d5d9 131 if( pwd == NULL )
Simon Cooksey 0:fb7af294d5d9 132 ret = mbedtls_pk_parse_key( ctx, buf, n, NULL, 0 );
Simon Cooksey 0:fb7af294d5d9 133 else
Simon Cooksey 0:fb7af294d5d9 134 ret = mbedtls_pk_parse_key( ctx, buf, n,
Simon Cooksey 0:fb7af294d5d9 135 (const unsigned char *) pwd, strlen( pwd ) );
Simon Cooksey 0:fb7af294d5d9 136
Simon Cooksey 0:fb7af294d5d9 137 mbedtls_zeroize( buf, n );
Simon Cooksey 0:fb7af294d5d9 138 mbedtls_free( buf );
Simon Cooksey 0:fb7af294d5d9 139
Simon Cooksey 0:fb7af294d5d9 140 return( ret );
Simon Cooksey 0:fb7af294d5d9 141 }
Simon Cooksey 0:fb7af294d5d9 142
Simon Cooksey 0:fb7af294d5d9 143 /*
Simon Cooksey 0:fb7af294d5d9 144 * Load and parse a public key
Simon Cooksey 0:fb7af294d5d9 145 */
Simon Cooksey 0:fb7af294d5d9 146 int mbedtls_pk_parse_public_keyfile( mbedtls_pk_context *ctx, const char *path )
Simon Cooksey 0:fb7af294d5d9 147 {
Simon Cooksey 0:fb7af294d5d9 148 int ret;
Simon Cooksey 0:fb7af294d5d9 149 size_t n;
Simon Cooksey 0:fb7af294d5d9 150 unsigned char *buf;
Simon Cooksey 0:fb7af294d5d9 151
Simon Cooksey 0:fb7af294d5d9 152 if( ( ret = mbedtls_pk_load_file( path, &buf, &n ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 153 return( ret );
Simon Cooksey 0:fb7af294d5d9 154
Simon Cooksey 0:fb7af294d5d9 155 ret = mbedtls_pk_parse_public_key( ctx, buf, n );
Simon Cooksey 0:fb7af294d5d9 156
Simon Cooksey 0:fb7af294d5d9 157 mbedtls_zeroize( buf, n );
Simon Cooksey 0:fb7af294d5d9 158 mbedtls_free( buf );
Simon Cooksey 0:fb7af294d5d9 159
Simon Cooksey 0:fb7af294d5d9 160 return( ret );
Simon Cooksey 0:fb7af294d5d9 161 }
Simon Cooksey 0:fb7af294d5d9 162 #endif /* MBEDTLS_FS_IO */
Simon Cooksey 0:fb7af294d5d9 163
Simon Cooksey 0:fb7af294d5d9 164 #if defined(MBEDTLS_ECP_C)
Simon Cooksey 0:fb7af294d5d9 165 /* Minimally parse an ECParameters buffer to and mbedtls_asn1_buf
Simon Cooksey 0:fb7af294d5d9 166 *
Simon Cooksey 0:fb7af294d5d9 167 * ECParameters ::= CHOICE {
Simon Cooksey 0:fb7af294d5d9 168 * namedCurve OBJECT IDENTIFIER
Simon Cooksey 0:fb7af294d5d9 169 * specifiedCurve SpecifiedECDomain -- = SEQUENCE { ... }
Simon Cooksey 0:fb7af294d5d9 170 * -- implicitCurve NULL
Simon Cooksey 0:fb7af294d5d9 171 * }
Simon Cooksey 0:fb7af294d5d9 172 */
Simon Cooksey 0:fb7af294d5d9 173 static int pk_get_ecparams( unsigned char **p, const unsigned char *end,
Simon Cooksey 0:fb7af294d5d9 174 mbedtls_asn1_buf *params )
Simon Cooksey 0:fb7af294d5d9 175 {
Simon Cooksey 0:fb7af294d5d9 176 int ret;
Simon Cooksey 0:fb7af294d5d9 177
Simon Cooksey 0:fb7af294d5d9 178 /* Tag may be either OID or SEQUENCE */
Simon Cooksey 0:fb7af294d5d9 179 params->tag = **p;
Simon Cooksey 0:fb7af294d5d9 180 if( params->tag != MBEDTLS_ASN1_OID
Simon Cooksey 0:fb7af294d5d9 181 #if defined(MBEDTLS_PK_PARSE_EC_EXTENDED)
Simon Cooksey 0:fb7af294d5d9 182 && params->tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE )
Simon Cooksey 0:fb7af294d5d9 183 #endif
Simon Cooksey 0:fb7af294d5d9 184 )
Simon Cooksey 0:fb7af294d5d9 185 {
Simon Cooksey 0:fb7af294d5d9 186 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
Simon Cooksey 0:fb7af294d5d9 187 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
Simon Cooksey 0:fb7af294d5d9 188 }
Simon Cooksey 0:fb7af294d5d9 189
Simon Cooksey 0:fb7af294d5d9 190 if( ( ret = mbedtls_asn1_get_tag( p, end, &params->len, params->tag ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 191 {
Simon Cooksey 0:fb7af294d5d9 192 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
Simon Cooksey 0:fb7af294d5d9 193 }
Simon Cooksey 0:fb7af294d5d9 194
Simon Cooksey 0:fb7af294d5d9 195 params->p = *p;
Simon Cooksey 0:fb7af294d5d9 196 *p += params->len;
Simon Cooksey 0:fb7af294d5d9 197
Simon Cooksey 0:fb7af294d5d9 198 if( *p != end )
Simon Cooksey 0:fb7af294d5d9 199 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
Simon Cooksey 0:fb7af294d5d9 200 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
Simon Cooksey 0:fb7af294d5d9 201
Simon Cooksey 0:fb7af294d5d9 202 return( 0 );
Simon Cooksey 0:fb7af294d5d9 203 }
Simon Cooksey 0:fb7af294d5d9 204
Simon Cooksey 0:fb7af294d5d9 205 #if defined(MBEDTLS_PK_PARSE_EC_EXTENDED)
Simon Cooksey 0:fb7af294d5d9 206 /*
Simon Cooksey 0:fb7af294d5d9 207 * Parse a SpecifiedECDomain (SEC 1 C.2) and (mostly) fill the group with it.
Simon Cooksey 0:fb7af294d5d9 208 * WARNING: the resulting group should only be used with
Simon Cooksey 0:fb7af294d5d9 209 * pk_group_id_from_specified(), since its base point may not be set correctly
Simon Cooksey 0:fb7af294d5d9 210 * if it was encoded compressed.
Simon Cooksey 0:fb7af294d5d9 211 *
Simon Cooksey 0:fb7af294d5d9 212 * SpecifiedECDomain ::= SEQUENCE {
Simon Cooksey 0:fb7af294d5d9 213 * version SpecifiedECDomainVersion(ecdpVer1 | ecdpVer2 | ecdpVer3, ...),
Simon Cooksey 0:fb7af294d5d9 214 * fieldID FieldID {{FieldTypes}},
Simon Cooksey 0:fb7af294d5d9 215 * curve Curve,
Simon Cooksey 0:fb7af294d5d9 216 * base ECPoint,
Simon Cooksey 0:fb7af294d5d9 217 * order INTEGER,
Simon Cooksey 0:fb7af294d5d9 218 * cofactor INTEGER OPTIONAL,
Simon Cooksey 0:fb7af294d5d9 219 * hash HashAlgorithm OPTIONAL,
Simon Cooksey 0:fb7af294d5d9 220 * ...
Simon Cooksey 0:fb7af294d5d9 221 * }
Simon Cooksey 0:fb7af294d5d9 222 *
Simon Cooksey 0:fb7af294d5d9 223 * We only support prime-field as field type, and ignore hash and cofactor.
Simon Cooksey 0:fb7af294d5d9 224 */
Simon Cooksey 0:fb7af294d5d9 225 static int pk_group_from_specified( const mbedtls_asn1_buf *params, mbedtls_ecp_group *grp )
Simon Cooksey 0:fb7af294d5d9 226 {
Simon Cooksey 0:fb7af294d5d9 227 int ret;
Simon Cooksey 0:fb7af294d5d9 228 unsigned char *p = params->p;
Simon Cooksey 0:fb7af294d5d9 229 const unsigned char * const end = params->p + params->len;
Simon Cooksey 0:fb7af294d5d9 230 const unsigned char *end_field, *end_curve;
Simon Cooksey 0:fb7af294d5d9 231 size_t len;
Simon Cooksey 0:fb7af294d5d9 232 int ver;
Simon Cooksey 0:fb7af294d5d9 233
Simon Cooksey 0:fb7af294d5d9 234 /* SpecifiedECDomainVersion ::= INTEGER { 1, 2, 3 } */
Simon Cooksey 0:fb7af294d5d9 235 if( ( ret = mbedtls_asn1_get_int( &p, end, &ver ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 236 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
Simon Cooksey 0:fb7af294d5d9 237
Simon Cooksey 0:fb7af294d5d9 238 if( ver < 1 || ver > 3 )
Simon Cooksey 0:fb7af294d5d9 239 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
Simon Cooksey 0:fb7af294d5d9 240
Simon Cooksey 0:fb7af294d5d9 241 /*
Simon Cooksey 0:fb7af294d5d9 242 * FieldID { FIELD-ID:IOSet } ::= SEQUENCE { -- Finite field
Simon Cooksey 0:fb7af294d5d9 243 * fieldType FIELD-ID.&id({IOSet}),
Simon Cooksey 0:fb7af294d5d9 244 * parameters FIELD-ID.&Type({IOSet}{@fieldType})
Simon Cooksey 0:fb7af294d5d9 245 * }
Simon Cooksey 0:fb7af294d5d9 246 */
Simon Cooksey 0:fb7af294d5d9 247 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
Simon Cooksey 0:fb7af294d5d9 248 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 249 return( ret );
Simon Cooksey 0:fb7af294d5d9 250
Simon Cooksey 0:fb7af294d5d9 251 end_field = p + len;
Simon Cooksey 0:fb7af294d5d9 252
Simon Cooksey 0:fb7af294d5d9 253 /*
Simon Cooksey 0:fb7af294d5d9 254 * FIELD-ID ::= TYPE-IDENTIFIER
Simon Cooksey 0:fb7af294d5d9 255 * FieldTypes FIELD-ID ::= {
Simon Cooksey 0:fb7af294d5d9 256 * { Prime-p IDENTIFIED BY prime-field } |
Simon Cooksey 0:fb7af294d5d9 257 * { Characteristic-two IDENTIFIED BY characteristic-two-field }
Simon Cooksey 0:fb7af294d5d9 258 * }
Simon Cooksey 0:fb7af294d5d9 259 * prime-field OBJECT IDENTIFIER ::= { id-fieldType 1 }
Simon Cooksey 0:fb7af294d5d9 260 */
Simon Cooksey 0:fb7af294d5d9 261 if( ( ret = mbedtls_asn1_get_tag( &p, end_field, &len, MBEDTLS_ASN1_OID ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 262 return( ret );
Simon Cooksey 0:fb7af294d5d9 263
Simon Cooksey 0:fb7af294d5d9 264 if( len != MBEDTLS_OID_SIZE( MBEDTLS_OID_ANSI_X9_62_PRIME_FIELD ) ||
Simon Cooksey 0:fb7af294d5d9 265 memcmp( p, MBEDTLS_OID_ANSI_X9_62_PRIME_FIELD, len ) != 0 )
Simon Cooksey 0:fb7af294d5d9 266 {
Simon Cooksey 0:fb7af294d5d9 267 return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
Simon Cooksey 0:fb7af294d5d9 268 }
Simon Cooksey 0:fb7af294d5d9 269
Simon Cooksey 0:fb7af294d5d9 270 p += len;
Simon Cooksey 0:fb7af294d5d9 271
Simon Cooksey 0:fb7af294d5d9 272 /* Prime-p ::= INTEGER -- Field of size p. */
Simon Cooksey 0:fb7af294d5d9 273 if( ( ret = mbedtls_asn1_get_mpi( &p, end_field, &grp->P ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 274 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
Simon Cooksey 0:fb7af294d5d9 275
Simon Cooksey 0:fb7af294d5d9 276 grp->pbits = mbedtls_mpi_bitlen( &grp->P );
Simon Cooksey 0:fb7af294d5d9 277
Simon Cooksey 0:fb7af294d5d9 278 if( p != end_field )
Simon Cooksey 0:fb7af294d5d9 279 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
Simon Cooksey 0:fb7af294d5d9 280 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
Simon Cooksey 0:fb7af294d5d9 281
Simon Cooksey 0:fb7af294d5d9 282 /*
Simon Cooksey 0:fb7af294d5d9 283 * Curve ::= SEQUENCE {
Simon Cooksey 0:fb7af294d5d9 284 * a FieldElement,
Simon Cooksey 0:fb7af294d5d9 285 * b FieldElement,
Simon Cooksey 0:fb7af294d5d9 286 * seed BIT STRING OPTIONAL
Simon Cooksey 0:fb7af294d5d9 287 * -- Shall be present if used in SpecifiedECDomain
Simon Cooksey 0:fb7af294d5d9 288 * -- with version equal to ecdpVer2 or ecdpVer3
Simon Cooksey 0:fb7af294d5d9 289 * }
Simon Cooksey 0:fb7af294d5d9 290 */
Simon Cooksey 0:fb7af294d5d9 291 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
Simon Cooksey 0:fb7af294d5d9 292 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 293 return( ret );
Simon Cooksey 0:fb7af294d5d9 294
Simon Cooksey 0:fb7af294d5d9 295 end_curve = p + len;
Simon Cooksey 0:fb7af294d5d9 296
Simon Cooksey 0:fb7af294d5d9 297 /*
Simon Cooksey 0:fb7af294d5d9 298 * FieldElement ::= OCTET STRING
Simon Cooksey 0:fb7af294d5d9 299 * containing an integer in the case of a prime field
Simon Cooksey 0:fb7af294d5d9 300 */
Simon Cooksey 0:fb7af294d5d9 301 if( ( ret = mbedtls_asn1_get_tag( &p, end_curve, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 ||
Simon Cooksey 0:fb7af294d5d9 302 ( ret = mbedtls_mpi_read_binary( &grp->A, p, len ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 303 {
Simon Cooksey 0:fb7af294d5d9 304 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
Simon Cooksey 0:fb7af294d5d9 305 }
Simon Cooksey 0:fb7af294d5d9 306
Simon Cooksey 0:fb7af294d5d9 307 p += len;
Simon Cooksey 0:fb7af294d5d9 308
Simon Cooksey 0:fb7af294d5d9 309 if( ( ret = mbedtls_asn1_get_tag( &p, end_curve, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 ||
Simon Cooksey 0:fb7af294d5d9 310 ( ret = mbedtls_mpi_read_binary( &grp->B, p, len ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 311 {
Simon Cooksey 0:fb7af294d5d9 312 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
Simon Cooksey 0:fb7af294d5d9 313 }
Simon Cooksey 0:fb7af294d5d9 314
Simon Cooksey 0:fb7af294d5d9 315 p += len;
Simon Cooksey 0:fb7af294d5d9 316
Simon Cooksey 0:fb7af294d5d9 317 /* Ignore seed BIT STRING OPTIONAL */
Simon Cooksey 0:fb7af294d5d9 318 if( ( ret = mbedtls_asn1_get_tag( &p, end_curve, &len, MBEDTLS_ASN1_BIT_STRING ) ) == 0 )
Simon Cooksey 0:fb7af294d5d9 319 p += len;
Simon Cooksey 0:fb7af294d5d9 320
Simon Cooksey 0:fb7af294d5d9 321 if( p != end_curve )
Simon Cooksey 0:fb7af294d5d9 322 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
Simon Cooksey 0:fb7af294d5d9 323 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
Simon Cooksey 0:fb7af294d5d9 324
Simon Cooksey 0:fb7af294d5d9 325 /*
Simon Cooksey 0:fb7af294d5d9 326 * ECPoint ::= OCTET STRING
Simon Cooksey 0:fb7af294d5d9 327 */
Simon Cooksey 0:fb7af294d5d9 328 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 329 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
Simon Cooksey 0:fb7af294d5d9 330
Simon Cooksey 0:fb7af294d5d9 331 if( ( ret = mbedtls_ecp_point_read_binary( grp, &grp->G,
Simon Cooksey 0:fb7af294d5d9 332 ( const unsigned char *) p, len ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 333 {
Simon Cooksey 0:fb7af294d5d9 334 /*
Simon Cooksey 0:fb7af294d5d9 335 * If we can't read the point because it's compressed, cheat by
Simon Cooksey 0:fb7af294d5d9 336 * reading only the X coordinate and the parity bit of Y.
Simon Cooksey 0:fb7af294d5d9 337 */
Simon Cooksey 0:fb7af294d5d9 338 if( ret != MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE ||
Simon Cooksey 0:fb7af294d5d9 339 ( p[0] != 0x02 && p[0] != 0x03 ) ||
Simon Cooksey 0:fb7af294d5d9 340 len != mbedtls_mpi_size( &grp->P ) + 1 ||
Simon Cooksey 0:fb7af294d5d9 341 mbedtls_mpi_read_binary( &grp->G.X, p + 1, len - 1 ) != 0 ||
Simon Cooksey 0:fb7af294d5d9 342 mbedtls_mpi_lset( &grp->G.Y, p[0] - 2 ) != 0 ||
Simon Cooksey 0:fb7af294d5d9 343 mbedtls_mpi_lset( &grp->G.Z, 1 ) != 0 )
Simon Cooksey 0:fb7af294d5d9 344 {
Simon Cooksey 0:fb7af294d5d9 345 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
Simon Cooksey 0:fb7af294d5d9 346 }
Simon Cooksey 0:fb7af294d5d9 347 }
Simon Cooksey 0:fb7af294d5d9 348
Simon Cooksey 0:fb7af294d5d9 349 p += len;
Simon Cooksey 0:fb7af294d5d9 350
Simon Cooksey 0:fb7af294d5d9 351 /*
Simon Cooksey 0:fb7af294d5d9 352 * order INTEGER
Simon Cooksey 0:fb7af294d5d9 353 */
Simon Cooksey 0:fb7af294d5d9 354 if( ( ret = mbedtls_asn1_get_mpi( &p, end, &grp->N ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 355 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
Simon Cooksey 0:fb7af294d5d9 356
Simon Cooksey 0:fb7af294d5d9 357 grp->nbits = mbedtls_mpi_bitlen( &grp->N );
Simon Cooksey 0:fb7af294d5d9 358
Simon Cooksey 0:fb7af294d5d9 359 /*
Simon Cooksey 0:fb7af294d5d9 360 * Allow optional elements by purposefully not enforcing p == end here.
Simon Cooksey 0:fb7af294d5d9 361 */
Simon Cooksey 0:fb7af294d5d9 362
Simon Cooksey 0:fb7af294d5d9 363 return( 0 );
Simon Cooksey 0:fb7af294d5d9 364 }
Simon Cooksey 0:fb7af294d5d9 365
Simon Cooksey 0:fb7af294d5d9 366 /*
Simon Cooksey 0:fb7af294d5d9 367 * Find the group id associated with an (almost filled) group as generated by
Simon Cooksey 0:fb7af294d5d9 368 * pk_group_from_specified(), or return an error if unknown.
Simon Cooksey 0:fb7af294d5d9 369 */
Simon Cooksey 0:fb7af294d5d9 370 static int pk_group_id_from_group( const mbedtls_ecp_group *grp, mbedtls_ecp_group_id *grp_id )
Simon Cooksey 0:fb7af294d5d9 371 {
Simon Cooksey 0:fb7af294d5d9 372 int ret = 0;
Simon Cooksey 0:fb7af294d5d9 373 mbedtls_ecp_group ref;
Simon Cooksey 0:fb7af294d5d9 374 const mbedtls_ecp_group_id *id;
Simon Cooksey 0:fb7af294d5d9 375
Simon Cooksey 0:fb7af294d5d9 376 mbedtls_ecp_group_init( &ref );
Simon Cooksey 0:fb7af294d5d9 377
Simon Cooksey 0:fb7af294d5d9 378 for( id = mbedtls_ecp_grp_id_list(); *id != MBEDTLS_ECP_DP_NONE; id++ )
Simon Cooksey 0:fb7af294d5d9 379 {
Simon Cooksey 0:fb7af294d5d9 380 /* Load the group associated to that id */
Simon Cooksey 0:fb7af294d5d9 381 mbedtls_ecp_group_free( &ref );
Simon Cooksey 0:fb7af294d5d9 382 MBEDTLS_MPI_CHK( mbedtls_ecp_group_load( &ref, *id ) );
Simon Cooksey 0:fb7af294d5d9 383
Simon Cooksey 0:fb7af294d5d9 384 /* Compare to the group we were given, starting with easy tests */
Simon Cooksey 0:fb7af294d5d9 385 if( grp->pbits == ref.pbits && grp->nbits == ref.nbits &&
Simon Cooksey 0:fb7af294d5d9 386 mbedtls_mpi_cmp_mpi( &grp->P, &ref.P ) == 0 &&
Simon Cooksey 0:fb7af294d5d9 387 mbedtls_mpi_cmp_mpi( &grp->A, &ref.A ) == 0 &&
Simon Cooksey 0:fb7af294d5d9 388 mbedtls_mpi_cmp_mpi( &grp->B, &ref.B ) == 0 &&
Simon Cooksey 0:fb7af294d5d9 389 mbedtls_mpi_cmp_mpi( &grp->N, &ref.N ) == 0 &&
Simon Cooksey 0:fb7af294d5d9 390 mbedtls_mpi_cmp_mpi( &grp->G.X, &ref.G.X ) == 0 &&
Simon Cooksey 0:fb7af294d5d9 391 mbedtls_mpi_cmp_mpi( &grp->G.Z, &ref.G.Z ) == 0 &&
Simon Cooksey 0:fb7af294d5d9 392 /* For Y we may only know the parity bit, so compare only that */
Simon Cooksey 0:fb7af294d5d9 393 mbedtls_mpi_get_bit( &grp->G.Y, 0 ) == mbedtls_mpi_get_bit( &ref.G.Y, 0 ) )
Simon Cooksey 0:fb7af294d5d9 394 {
Simon Cooksey 0:fb7af294d5d9 395 break;
Simon Cooksey 0:fb7af294d5d9 396 }
Simon Cooksey 0:fb7af294d5d9 397
Simon Cooksey 0:fb7af294d5d9 398 }
Simon Cooksey 0:fb7af294d5d9 399
Simon Cooksey 0:fb7af294d5d9 400 cleanup:
Simon Cooksey 0:fb7af294d5d9 401 mbedtls_ecp_group_free( &ref );
Simon Cooksey 0:fb7af294d5d9 402
Simon Cooksey 0:fb7af294d5d9 403 *grp_id = *id;
Simon Cooksey 0:fb7af294d5d9 404
Simon Cooksey 0:fb7af294d5d9 405 if( ret == 0 && *id == MBEDTLS_ECP_DP_NONE )
Simon Cooksey 0:fb7af294d5d9 406 ret = MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE;
Simon Cooksey 0:fb7af294d5d9 407
Simon Cooksey 0:fb7af294d5d9 408 return( ret );
Simon Cooksey 0:fb7af294d5d9 409 }
Simon Cooksey 0:fb7af294d5d9 410
Simon Cooksey 0:fb7af294d5d9 411 /*
Simon Cooksey 0:fb7af294d5d9 412 * Parse a SpecifiedECDomain (SEC 1 C.2) and find the associated group ID
Simon Cooksey 0:fb7af294d5d9 413 */
Simon Cooksey 0:fb7af294d5d9 414 static int pk_group_id_from_specified( const mbedtls_asn1_buf *params,
Simon Cooksey 0:fb7af294d5d9 415 mbedtls_ecp_group_id *grp_id )
Simon Cooksey 0:fb7af294d5d9 416 {
Simon Cooksey 0:fb7af294d5d9 417 int ret;
Simon Cooksey 0:fb7af294d5d9 418 mbedtls_ecp_group grp;
Simon Cooksey 0:fb7af294d5d9 419
Simon Cooksey 0:fb7af294d5d9 420 mbedtls_ecp_group_init( &grp );
Simon Cooksey 0:fb7af294d5d9 421
Simon Cooksey 0:fb7af294d5d9 422 if( ( ret = pk_group_from_specified( params, &grp ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 423 goto cleanup;
Simon Cooksey 0:fb7af294d5d9 424
Simon Cooksey 0:fb7af294d5d9 425 ret = pk_group_id_from_group( &grp, grp_id );
Simon Cooksey 0:fb7af294d5d9 426
Simon Cooksey 0:fb7af294d5d9 427 cleanup:
Simon Cooksey 0:fb7af294d5d9 428 mbedtls_ecp_group_free( &grp );
Simon Cooksey 0:fb7af294d5d9 429
Simon Cooksey 0:fb7af294d5d9 430 return( ret );
Simon Cooksey 0:fb7af294d5d9 431 }
Simon Cooksey 0:fb7af294d5d9 432 #endif /* MBEDTLS_PK_PARSE_EC_EXTENDED */
Simon Cooksey 0:fb7af294d5d9 433
Simon Cooksey 0:fb7af294d5d9 434 /*
Simon Cooksey 0:fb7af294d5d9 435 * Use EC parameters to initialise an EC group
Simon Cooksey 0:fb7af294d5d9 436 *
Simon Cooksey 0:fb7af294d5d9 437 * ECParameters ::= CHOICE {
Simon Cooksey 0:fb7af294d5d9 438 * namedCurve OBJECT IDENTIFIER
Simon Cooksey 0:fb7af294d5d9 439 * specifiedCurve SpecifiedECDomain -- = SEQUENCE { ... }
Simon Cooksey 0:fb7af294d5d9 440 * -- implicitCurve NULL
Simon Cooksey 0:fb7af294d5d9 441 */
Simon Cooksey 0:fb7af294d5d9 442 static int pk_use_ecparams( const mbedtls_asn1_buf *params, mbedtls_ecp_group *grp )
Simon Cooksey 0:fb7af294d5d9 443 {
Simon Cooksey 0:fb7af294d5d9 444 int ret;
Simon Cooksey 0:fb7af294d5d9 445 mbedtls_ecp_group_id grp_id;
Simon Cooksey 0:fb7af294d5d9 446
Simon Cooksey 0:fb7af294d5d9 447 if( params->tag == MBEDTLS_ASN1_OID )
Simon Cooksey 0:fb7af294d5d9 448 {
Simon Cooksey 0:fb7af294d5d9 449 if( mbedtls_oid_get_ec_grp( params, &grp_id ) != 0 )
Simon Cooksey 0:fb7af294d5d9 450 return( MBEDTLS_ERR_PK_UNKNOWN_NAMED_CURVE );
Simon Cooksey 0:fb7af294d5d9 451 }
Simon Cooksey 0:fb7af294d5d9 452 else
Simon Cooksey 0:fb7af294d5d9 453 {
Simon Cooksey 0:fb7af294d5d9 454 #if defined(MBEDTLS_PK_PARSE_EC_EXTENDED)
Simon Cooksey 0:fb7af294d5d9 455 if( ( ret = pk_group_id_from_specified( params, &grp_id ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 456 return( ret );
Simon Cooksey 0:fb7af294d5d9 457 #else
Simon Cooksey 0:fb7af294d5d9 458 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
Simon Cooksey 0:fb7af294d5d9 459 #endif
Simon Cooksey 0:fb7af294d5d9 460 }
Simon Cooksey 0:fb7af294d5d9 461
Simon Cooksey 0:fb7af294d5d9 462 /*
Simon Cooksey 0:fb7af294d5d9 463 * grp may already be initilialized; if so, make sure IDs match
Simon Cooksey 0:fb7af294d5d9 464 */
Simon Cooksey 0:fb7af294d5d9 465 if( grp->id != MBEDTLS_ECP_DP_NONE && grp->id != grp_id )
Simon Cooksey 0:fb7af294d5d9 466 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
Simon Cooksey 0:fb7af294d5d9 467
Simon Cooksey 0:fb7af294d5d9 468 if( ( ret = mbedtls_ecp_group_load( grp, grp_id ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 469 return( ret );
Simon Cooksey 0:fb7af294d5d9 470
Simon Cooksey 0:fb7af294d5d9 471 return( 0 );
Simon Cooksey 0:fb7af294d5d9 472 }
Simon Cooksey 0:fb7af294d5d9 473
Simon Cooksey 0:fb7af294d5d9 474 /*
Simon Cooksey 0:fb7af294d5d9 475 * EC public key is an EC point
Simon Cooksey 0:fb7af294d5d9 476 *
Simon Cooksey 0:fb7af294d5d9 477 * The caller is responsible for clearing the structure upon failure if
Simon Cooksey 0:fb7af294d5d9 478 * desired. Take care to pass along the possible ECP_FEATURE_UNAVAILABLE
Simon Cooksey 0:fb7af294d5d9 479 * return code of mbedtls_ecp_point_read_binary() and leave p in a usable state.
Simon Cooksey 0:fb7af294d5d9 480 */
Simon Cooksey 0:fb7af294d5d9 481 static int pk_get_ecpubkey( unsigned char **p, const unsigned char *end,
Simon Cooksey 0:fb7af294d5d9 482 mbedtls_ecp_keypair *key )
Simon Cooksey 0:fb7af294d5d9 483 {
Simon Cooksey 0:fb7af294d5d9 484 int ret;
Simon Cooksey 0:fb7af294d5d9 485
Simon Cooksey 0:fb7af294d5d9 486 if( ( ret = mbedtls_ecp_point_read_binary( &key->grp, &key->Q,
Simon Cooksey 0:fb7af294d5d9 487 (const unsigned char *) *p, end - *p ) ) == 0 )
Simon Cooksey 0:fb7af294d5d9 488 {
Simon Cooksey 0:fb7af294d5d9 489 ret = mbedtls_ecp_check_pubkey( &key->grp, &key->Q );
Simon Cooksey 0:fb7af294d5d9 490 }
Simon Cooksey 0:fb7af294d5d9 491
Simon Cooksey 0:fb7af294d5d9 492 /*
Simon Cooksey 0:fb7af294d5d9 493 * We know mbedtls_ecp_point_read_binary consumed all bytes or failed
Simon Cooksey 0:fb7af294d5d9 494 */
Simon Cooksey 0:fb7af294d5d9 495 *p = (unsigned char *) end;
Simon Cooksey 0:fb7af294d5d9 496
Simon Cooksey 0:fb7af294d5d9 497 return( ret );
Simon Cooksey 0:fb7af294d5d9 498 }
Simon Cooksey 0:fb7af294d5d9 499 #endif /* MBEDTLS_ECP_C */
Simon Cooksey 0:fb7af294d5d9 500
Simon Cooksey 0:fb7af294d5d9 501 #if defined(MBEDTLS_RSA_C)
Simon Cooksey 0:fb7af294d5d9 502 /*
Simon Cooksey 0:fb7af294d5d9 503 * RSAPublicKey ::= SEQUENCE {
Simon Cooksey 0:fb7af294d5d9 504 * modulus INTEGER, -- n
Simon Cooksey 0:fb7af294d5d9 505 * publicExponent INTEGER -- e
Simon Cooksey 0:fb7af294d5d9 506 * }
Simon Cooksey 0:fb7af294d5d9 507 */
Simon Cooksey 0:fb7af294d5d9 508 static int pk_get_rsapubkey( unsigned char **p,
Simon Cooksey 0:fb7af294d5d9 509 const unsigned char *end,
Simon Cooksey 0:fb7af294d5d9 510 mbedtls_rsa_context *rsa )
Simon Cooksey 0:fb7af294d5d9 511 {
Simon Cooksey 0:fb7af294d5d9 512 int ret;
Simon Cooksey 0:fb7af294d5d9 513 size_t len;
Simon Cooksey 0:fb7af294d5d9 514
Simon Cooksey 0:fb7af294d5d9 515 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
Simon Cooksey 0:fb7af294d5d9 516 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 517 return( MBEDTLS_ERR_PK_INVALID_PUBKEY + ret );
Simon Cooksey 0:fb7af294d5d9 518
Simon Cooksey 0:fb7af294d5d9 519 if( *p + len != end )
Simon Cooksey 0:fb7af294d5d9 520 return( MBEDTLS_ERR_PK_INVALID_PUBKEY +
Simon Cooksey 0:fb7af294d5d9 521 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
Simon Cooksey 0:fb7af294d5d9 522
Simon Cooksey 0:fb7af294d5d9 523 if( ( ret = mbedtls_asn1_get_mpi( p, end, &rsa->N ) ) != 0 ||
Simon Cooksey 0:fb7af294d5d9 524 ( ret = mbedtls_asn1_get_mpi( p, end, &rsa->E ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 525 return( MBEDTLS_ERR_PK_INVALID_PUBKEY + ret );
Simon Cooksey 0:fb7af294d5d9 526
Simon Cooksey 0:fb7af294d5d9 527 if( *p != end )
Simon Cooksey 0:fb7af294d5d9 528 return( MBEDTLS_ERR_PK_INVALID_PUBKEY +
Simon Cooksey 0:fb7af294d5d9 529 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
Simon Cooksey 0:fb7af294d5d9 530
Simon Cooksey 0:fb7af294d5d9 531 if( ( ret = mbedtls_rsa_check_pubkey( rsa ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 532 return( MBEDTLS_ERR_PK_INVALID_PUBKEY );
Simon Cooksey 0:fb7af294d5d9 533
Simon Cooksey 0:fb7af294d5d9 534 rsa->len = mbedtls_mpi_size( &rsa->N );
Simon Cooksey 0:fb7af294d5d9 535
Simon Cooksey 0:fb7af294d5d9 536 return( 0 );
Simon Cooksey 0:fb7af294d5d9 537 }
Simon Cooksey 0:fb7af294d5d9 538 #endif /* MBEDTLS_RSA_C */
Simon Cooksey 0:fb7af294d5d9 539
Simon Cooksey 0:fb7af294d5d9 540 /* Get a PK algorithm identifier
Simon Cooksey 0:fb7af294d5d9 541 *
Simon Cooksey 0:fb7af294d5d9 542 * AlgorithmIdentifier ::= SEQUENCE {
Simon Cooksey 0:fb7af294d5d9 543 * algorithm OBJECT IDENTIFIER,
Simon Cooksey 0:fb7af294d5d9 544 * parameters ANY DEFINED BY algorithm OPTIONAL }
Simon Cooksey 0:fb7af294d5d9 545 */
Simon Cooksey 0:fb7af294d5d9 546 static int pk_get_pk_alg( unsigned char **p,
Simon Cooksey 0:fb7af294d5d9 547 const unsigned char *end,
Simon Cooksey 0:fb7af294d5d9 548 mbedtls_pk_type_t *pk_alg, mbedtls_asn1_buf *params )
Simon Cooksey 0:fb7af294d5d9 549 {
Simon Cooksey 0:fb7af294d5d9 550 int ret;
Simon Cooksey 0:fb7af294d5d9 551 mbedtls_asn1_buf alg_oid;
Simon Cooksey 0:fb7af294d5d9 552
Simon Cooksey 0:fb7af294d5d9 553 memset( params, 0, sizeof(mbedtls_asn1_buf) );
Simon Cooksey 0:fb7af294d5d9 554
Simon Cooksey 0:fb7af294d5d9 555 if( ( ret = mbedtls_asn1_get_alg( p, end, &alg_oid, params ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 556 return( MBEDTLS_ERR_PK_INVALID_ALG + ret );
Simon Cooksey 0:fb7af294d5d9 557
Simon Cooksey 0:fb7af294d5d9 558 if( mbedtls_oid_get_pk_alg( &alg_oid, pk_alg ) != 0 )
Simon Cooksey 0:fb7af294d5d9 559 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
Simon Cooksey 0:fb7af294d5d9 560
Simon Cooksey 0:fb7af294d5d9 561 /*
Simon Cooksey 0:fb7af294d5d9 562 * No parameters with RSA (only for EC)
Simon Cooksey 0:fb7af294d5d9 563 */
Simon Cooksey 0:fb7af294d5d9 564 if( *pk_alg == MBEDTLS_PK_RSA &&
Simon Cooksey 0:fb7af294d5d9 565 ( ( params->tag != MBEDTLS_ASN1_NULL && params->tag != 0 ) ||
Simon Cooksey 0:fb7af294d5d9 566 params->len != 0 ) )
Simon Cooksey 0:fb7af294d5d9 567 {
Simon Cooksey 0:fb7af294d5d9 568 return( MBEDTLS_ERR_PK_INVALID_ALG );
Simon Cooksey 0:fb7af294d5d9 569 }
Simon Cooksey 0:fb7af294d5d9 570
Simon Cooksey 0:fb7af294d5d9 571 return( 0 );
Simon Cooksey 0:fb7af294d5d9 572 }
Simon Cooksey 0:fb7af294d5d9 573
Simon Cooksey 0:fb7af294d5d9 574 /*
Simon Cooksey 0:fb7af294d5d9 575 * SubjectPublicKeyInfo ::= SEQUENCE {
Simon Cooksey 0:fb7af294d5d9 576 * algorithm AlgorithmIdentifier,
Simon Cooksey 0:fb7af294d5d9 577 * subjectPublicKey BIT STRING }
Simon Cooksey 0:fb7af294d5d9 578 */
Simon Cooksey 0:fb7af294d5d9 579 int mbedtls_pk_parse_subpubkey( unsigned char **p, const unsigned char *end,
Simon Cooksey 0:fb7af294d5d9 580 mbedtls_pk_context *pk )
Simon Cooksey 0:fb7af294d5d9 581 {
Simon Cooksey 0:fb7af294d5d9 582 int ret;
Simon Cooksey 0:fb7af294d5d9 583 size_t len;
Simon Cooksey 0:fb7af294d5d9 584 mbedtls_asn1_buf alg_params;
Simon Cooksey 0:fb7af294d5d9 585 mbedtls_pk_type_t pk_alg = MBEDTLS_PK_NONE;
Simon Cooksey 0:fb7af294d5d9 586 const mbedtls_pk_info_t *pk_info;
Simon Cooksey 0:fb7af294d5d9 587
Simon Cooksey 0:fb7af294d5d9 588 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
Simon Cooksey 0:fb7af294d5d9 589 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 590 {
Simon Cooksey 0:fb7af294d5d9 591 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
Simon Cooksey 0:fb7af294d5d9 592 }
Simon Cooksey 0:fb7af294d5d9 593
Simon Cooksey 0:fb7af294d5d9 594 end = *p + len;
Simon Cooksey 0:fb7af294d5d9 595
Simon Cooksey 0:fb7af294d5d9 596 if( ( ret = pk_get_pk_alg( p, end, &pk_alg, &alg_params ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 597 return( ret );
Simon Cooksey 0:fb7af294d5d9 598
Simon Cooksey 0:fb7af294d5d9 599 if( ( ret = mbedtls_asn1_get_bitstring_null( p, end, &len ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 600 return( MBEDTLS_ERR_PK_INVALID_PUBKEY + ret );
Simon Cooksey 0:fb7af294d5d9 601
Simon Cooksey 0:fb7af294d5d9 602 if( *p + len != end )
Simon Cooksey 0:fb7af294d5d9 603 return( MBEDTLS_ERR_PK_INVALID_PUBKEY +
Simon Cooksey 0:fb7af294d5d9 604 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
Simon Cooksey 0:fb7af294d5d9 605
Simon Cooksey 0:fb7af294d5d9 606 if( ( pk_info = mbedtls_pk_info_from_type( pk_alg ) ) == NULL )
Simon Cooksey 0:fb7af294d5d9 607 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
Simon Cooksey 0:fb7af294d5d9 608
Simon Cooksey 0:fb7af294d5d9 609 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 610 return( ret );
Simon Cooksey 0:fb7af294d5d9 611
Simon Cooksey 0:fb7af294d5d9 612 #if defined(MBEDTLS_RSA_C)
Simon Cooksey 0:fb7af294d5d9 613 if( pk_alg == MBEDTLS_PK_RSA )
Simon Cooksey 0:fb7af294d5d9 614 {
Simon Cooksey 0:fb7af294d5d9 615 ret = pk_get_rsapubkey( p, end, mbedtls_pk_rsa( *pk ) );
Simon Cooksey 0:fb7af294d5d9 616 } else
Simon Cooksey 0:fb7af294d5d9 617 #endif /* MBEDTLS_RSA_C */
Simon Cooksey 0:fb7af294d5d9 618 #if defined(MBEDTLS_ECP_C)
Simon Cooksey 0:fb7af294d5d9 619 if( pk_alg == MBEDTLS_PK_ECKEY_DH || pk_alg == MBEDTLS_PK_ECKEY )
Simon Cooksey 0:fb7af294d5d9 620 {
Simon Cooksey 0:fb7af294d5d9 621 ret = pk_use_ecparams( &alg_params, &mbedtls_pk_ec( *pk )->grp );
Simon Cooksey 0:fb7af294d5d9 622 if( ret == 0 )
Simon Cooksey 0:fb7af294d5d9 623 ret = pk_get_ecpubkey( p, end, mbedtls_pk_ec( *pk ) );
Simon Cooksey 0:fb7af294d5d9 624 } else
Simon Cooksey 0:fb7af294d5d9 625 #endif /* MBEDTLS_ECP_C */
Simon Cooksey 0:fb7af294d5d9 626 ret = MBEDTLS_ERR_PK_UNKNOWN_PK_ALG;
Simon Cooksey 0:fb7af294d5d9 627
Simon Cooksey 0:fb7af294d5d9 628 if( ret == 0 && *p != end )
Simon Cooksey 0:fb7af294d5d9 629 ret = MBEDTLS_ERR_PK_INVALID_PUBKEY
Simon Cooksey 0:fb7af294d5d9 630 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH;
Simon Cooksey 0:fb7af294d5d9 631
Simon Cooksey 0:fb7af294d5d9 632 if( ret != 0 )
Simon Cooksey 0:fb7af294d5d9 633 mbedtls_pk_free( pk );
Simon Cooksey 0:fb7af294d5d9 634
Simon Cooksey 0:fb7af294d5d9 635 return( ret );
Simon Cooksey 0:fb7af294d5d9 636 }
Simon Cooksey 0:fb7af294d5d9 637
Simon Cooksey 0:fb7af294d5d9 638 #if defined(MBEDTLS_RSA_C)
Simon Cooksey 0:fb7af294d5d9 639 /*
Simon Cooksey 0:fb7af294d5d9 640 * Parse a PKCS#1 encoded private RSA key
Simon Cooksey 0:fb7af294d5d9 641 */
Simon Cooksey 0:fb7af294d5d9 642 static int pk_parse_key_pkcs1_der( mbedtls_rsa_context *rsa,
Simon Cooksey 0:fb7af294d5d9 643 const unsigned char *key,
Simon Cooksey 0:fb7af294d5d9 644 size_t keylen )
Simon Cooksey 0:fb7af294d5d9 645 {
Simon Cooksey 0:fb7af294d5d9 646 int ret;
Simon Cooksey 0:fb7af294d5d9 647 size_t len;
Simon Cooksey 0:fb7af294d5d9 648 unsigned char *p, *end;
Simon Cooksey 0:fb7af294d5d9 649
Simon Cooksey 0:fb7af294d5d9 650 p = (unsigned char *) key;
Simon Cooksey 0:fb7af294d5d9 651 end = p + keylen;
Simon Cooksey 0:fb7af294d5d9 652
Simon Cooksey 0:fb7af294d5d9 653 /*
Simon Cooksey 0:fb7af294d5d9 654 * This function parses the RSAPrivateKey (PKCS#1)
Simon Cooksey 0:fb7af294d5d9 655 *
Simon Cooksey 0:fb7af294d5d9 656 * RSAPrivateKey ::= SEQUENCE {
Simon Cooksey 0:fb7af294d5d9 657 * version Version,
Simon Cooksey 0:fb7af294d5d9 658 * modulus INTEGER, -- n
Simon Cooksey 0:fb7af294d5d9 659 * publicExponent INTEGER, -- e
Simon Cooksey 0:fb7af294d5d9 660 * privateExponent INTEGER, -- d
Simon Cooksey 0:fb7af294d5d9 661 * prime1 INTEGER, -- p
Simon Cooksey 0:fb7af294d5d9 662 * prime2 INTEGER, -- q
Simon Cooksey 0:fb7af294d5d9 663 * exponent1 INTEGER, -- d mod (p-1)
Simon Cooksey 0:fb7af294d5d9 664 * exponent2 INTEGER, -- d mod (q-1)
Simon Cooksey 0:fb7af294d5d9 665 * coefficient INTEGER, -- (inverse of q) mod p
Simon Cooksey 0:fb7af294d5d9 666 * otherPrimeInfos OtherPrimeInfos OPTIONAL
Simon Cooksey 0:fb7af294d5d9 667 * }
Simon Cooksey 0:fb7af294d5d9 668 */
Simon Cooksey 0:fb7af294d5d9 669 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
Simon Cooksey 0:fb7af294d5d9 670 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 671 {
Simon Cooksey 0:fb7af294d5d9 672 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
Simon Cooksey 0:fb7af294d5d9 673 }
Simon Cooksey 0:fb7af294d5d9 674
Simon Cooksey 0:fb7af294d5d9 675 end = p + len;
Simon Cooksey 0:fb7af294d5d9 676
Simon Cooksey 0:fb7af294d5d9 677 if( ( ret = mbedtls_asn1_get_int( &p, end, &rsa->ver ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 678 {
Simon Cooksey 0:fb7af294d5d9 679 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
Simon Cooksey 0:fb7af294d5d9 680 }
Simon Cooksey 0:fb7af294d5d9 681
Simon Cooksey 0:fb7af294d5d9 682 if( rsa->ver != 0 )
Simon Cooksey 0:fb7af294d5d9 683 {
Simon Cooksey 0:fb7af294d5d9 684 return( MBEDTLS_ERR_PK_KEY_INVALID_VERSION );
Simon Cooksey 0:fb7af294d5d9 685 }
Simon Cooksey 0:fb7af294d5d9 686
Simon Cooksey 0:fb7af294d5d9 687 if( ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->N ) ) != 0 ||
Simon Cooksey 0:fb7af294d5d9 688 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->E ) ) != 0 ||
Simon Cooksey 0:fb7af294d5d9 689 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->D ) ) != 0 ||
Simon Cooksey 0:fb7af294d5d9 690 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->P ) ) != 0 ||
Simon Cooksey 0:fb7af294d5d9 691 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->Q ) ) != 0 ||
Simon Cooksey 0:fb7af294d5d9 692 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->DP ) ) != 0 ||
Simon Cooksey 0:fb7af294d5d9 693 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->DQ ) ) != 0 ||
Simon Cooksey 0:fb7af294d5d9 694 ( ret = mbedtls_asn1_get_mpi( &p, end, &rsa->QP ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 695 {
Simon Cooksey 0:fb7af294d5d9 696 mbedtls_rsa_free( rsa );
Simon Cooksey 0:fb7af294d5d9 697 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
Simon Cooksey 0:fb7af294d5d9 698 }
Simon Cooksey 0:fb7af294d5d9 699
Simon Cooksey 0:fb7af294d5d9 700 rsa->len = mbedtls_mpi_size( &rsa->N );
Simon Cooksey 0:fb7af294d5d9 701
Simon Cooksey 0:fb7af294d5d9 702 if( p != end )
Simon Cooksey 0:fb7af294d5d9 703 {
Simon Cooksey 0:fb7af294d5d9 704 mbedtls_rsa_free( rsa );
Simon Cooksey 0:fb7af294d5d9 705 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
Simon Cooksey 0:fb7af294d5d9 706 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
Simon Cooksey 0:fb7af294d5d9 707 }
Simon Cooksey 0:fb7af294d5d9 708
Simon Cooksey 0:fb7af294d5d9 709 if( ( ret = mbedtls_rsa_check_privkey( rsa ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 710 {
Simon Cooksey 0:fb7af294d5d9 711 mbedtls_rsa_free( rsa );
Simon Cooksey 0:fb7af294d5d9 712 return( ret );
Simon Cooksey 0:fb7af294d5d9 713 }
Simon Cooksey 0:fb7af294d5d9 714
Simon Cooksey 0:fb7af294d5d9 715 return( 0 );
Simon Cooksey 0:fb7af294d5d9 716 }
Simon Cooksey 0:fb7af294d5d9 717 #endif /* MBEDTLS_RSA_C */
Simon Cooksey 0:fb7af294d5d9 718
Simon Cooksey 0:fb7af294d5d9 719 #if defined(MBEDTLS_ECP_C)
Simon Cooksey 0:fb7af294d5d9 720 /*
Simon Cooksey 0:fb7af294d5d9 721 * Parse a SEC1 encoded private EC key
Simon Cooksey 0:fb7af294d5d9 722 */
Simon Cooksey 0:fb7af294d5d9 723 static int pk_parse_key_sec1_der( mbedtls_ecp_keypair *eck,
Simon Cooksey 0:fb7af294d5d9 724 const unsigned char *key,
Simon Cooksey 0:fb7af294d5d9 725 size_t keylen )
Simon Cooksey 0:fb7af294d5d9 726 {
Simon Cooksey 0:fb7af294d5d9 727 int ret;
Simon Cooksey 0:fb7af294d5d9 728 int version, pubkey_done;
Simon Cooksey 0:fb7af294d5d9 729 size_t len;
Simon Cooksey 0:fb7af294d5d9 730 mbedtls_asn1_buf params;
Simon Cooksey 0:fb7af294d5d9 731 unsigned char *p = (unsigned char *) key;
Simon Cooksey 0:fb7af294d5d9 732 unsigned char *end = p + keylen;
Simon Cooksey 0:fb7af294d5d9 733 unsigned char *end2;
Simon Cooksey 0:fb7af294d5d9 734
Simon Cooksey 0:fb7af294d5d9 735 /*
Simon Cooksey 0:fb7af294d5d9 736 * RFC 5915, or SEC1 Appendix C.4
Simon Cooksey 0:fb7af294d5d9 737 *
Simon Cooksey 0:fb7af294d5d9 738 * ECPrivateKey ::= SEQUENCE {
Simon Cooksey 0:fb7af294d5d9 739 * version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
Simon Cooksey 0:fb7af294d5d9 740 * privateKey OCTET STRING,
Simon Cooksey 0:fb7af294d5d9 741 * parameters [0] ECParameters {{ NamedCurve }} OPTIONAL,
Simon Cooksey 0:fb7af294d5d9 742 * publicKey [1] BIT STRING OPTIONAL
Simon Cooksey 0:fb7af294d5d9 743 * }
Simon Cooksey 0:fb7af294d5d9 744 */
Simon Cooksey 0:fb7af294d5d9 745 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
Simon Cooksey 0:fb7af294d5d9 746 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 747 {
Simon Cooksey 0:fb7af294d5d9 748 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
Simon Cooksey 0:fb7af294d5d9 749 }
Simon Cooksey 0:fb7af294d5d9 750
Simon Cooksey 0:fb7af294d5d9 751 end = p + len;
Simon Cooksey 0:fb7af294d5d9 752
Simon Cooksey 0:fb7af294d5d9 753 if( ( ret = mbedtls_asn1_get_int( &p, end, &version ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 754 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
Simon Cooksey 0:fb7af294d5d9 755
Simon Cooksey 0:fb7af294d5d9 756 if( version != 1 )
Simon Cooksey 0:fb7af294d5d9 757 return( MBEDTLS_ERR_PK_KEY_INVALID_VERSION );
Simon Cooksey 0:fb7af294d5d9 758
Simon Cooksey 0:fb7af294d5d9 759 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 760 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
Simon Cooksey 0:fb7af294d5d9 761
Simon Cooksey 0:fb7af294d5d9 762 if( ( ret = mbedtls_mpi_read_binary( &eck->d, p, len ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 763 {
Simon Cooksey 0:fb7af294d5d9 764 mbedtls_ecp_keypair_free( eck );
Simon Cooksey 0:fb7af294d5d9 765 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
Simon Cooksey 0:fb7af294d5d9 766 }
Simon Cooksey 0:fb7af294d5d9 767
Simon Cooksey 0:fb7af294d5d9 768 p += len;
Simon Cooksey 0:fb7af294d5d9 769
Simon Cooksey 0:fb7af294d5d9 770 pubkey_done = 0;
Simon Cooksey 0:fb7af294d5d9 771 if( p != end )
Simon Cooksey 0:fb7af294d5d9 772 {
Simon Cooksey 0:fb7af294d5d9 773 /*
Simon Cooksey 0:fb7af294d5d9 774 * Is 'parameters' present?
Simon Cooksey 0:fb7af294d5d9 775 */
Simon Cooksey 0:fb7af294d5d9 776 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
Simon Cooksey 0:fb7af294d5d9 777 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 0 ) ) == 0 )
Simon Cooksey 0:fb7af294d5d9 778 {
Simon Cooksey 0:fb7af294d5d9 779 if( ( ret = pk_get_ecparams( &p, p + len, &params) ) != 0 ||
Simon Cooksey 0:fb7af294d5d9 780 ( ret = pk_use_ecparams( &params, &eck->grp ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 781 {
Simon Cooksey 0:fb7af294d5d9 782 mbedtls_ecp_keypair_free( eck );
Simon Cooksey 0:fb7af294d5d9 783 return( ret );
Simon Cooksey 0:fb7af294d5d9 784 }
Simon Cooksey 0:fb7af294d5d9 785 }
Simon Cooksey 0:fb7af294d5d9 786 else if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
Simon Cooksey 0:fb7af294d5d9 787 {
Simon Cooksey 0:fb7af294d5d9 788 mbedtls_ecp_keypair_free( eck );
Simon Cooksey 0:fb7af294d5d9 789 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
Simon Cooksey 0:fb7af294d5d9 790 }
Simon Cooksey 0:fb7af294d5d9 791
Simon Cooksey 0:fb7af294d5d9 792 /*
Simon Cooksey 0:fb7af294d5d9 793 * Is 'publickey' present? If not, or if we can't read it (eg because it
Simon Cooksey 0:fb7af294d5d9 794 * is compressed), create it from the private key.
Simon Cooksey 0:fb7af294d5d9 795 */
Simon Cooksey 0:fb7af294d5d9 796 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
Simon Cooksey 0:fb7af294d5d9 797 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 1 ) ) == 0 )
Simon Cooksey 0:fb7af294d5d9 798 {
Simon Cooksey 0:fb7af294d5d9 799 end2 = p + len;
Simon Cooksey 0:fb7af294d5d9 800
Simon Cooksey 0:fb7af294d5d9 801 if( ( ret = mbedtls_asn1_get_bitstring_null( &p, end2, &len ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 802 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
Simon Cooksey 0:fb7af294d5d9 803
Simon Cooksey 0:fb7af294d5d9 804 if( p + len != end2 )
Simon Cooksey 0:fb7af294d5d9 805 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
Simon Cooksey 0:fb7af294d5d9 806 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
Simon Cooksey 0:fb7af294d5d9 807
Simon Cooksey 0:fb7af294d5d9 808 if( ( ret = pk_get_ecpubkey( &p, end2, eck ) ) == 0 )
Simon Cooksey 0:fb7af294d5d9 809 pubkey_done = 1;
Simon Cooksey 0:fb7af294d5d9 810 else
Simon Cooksey 0:fb7af294d5d9 811 {
Simon Cooksey 0:fb7af294d5d9 812 /*
Simon Cooksey 0:fb7af294d5d9 813 * The only acceptable failure mode of pk_get_ecpubkey() above
Simon Cooksey 0:fb7af294d5d9 814 * is if the point format is not recognized.
Simon Cooksey 0:fb7af294d5d9 815 */
Simon Cooksey 0:fb7af294d5d9 816 if( ret != MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE )
Simon Cooksey 0:fb7af294d5d9 817 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
Simon Cooksey 0:fb7af294d5d9 818 }
Simon Cooksey 0:fb7af294d5d9 819 }
Simon Cooksey 0:fb7af294d5d9 820 else if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
Simon Cooksey 0:fb7af294d5d9 821 {
Simon Cooksey 0:fb7af294d5d9 822 mbedtls_ecp_keypair_free( eck );
Simon Cooksey 0:fb7af294d5d9 823 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
Simon Cooksey 0:fb7af294d5d9 824 }
Simon Cooksey 0:fb7af294d5d9 825 }
Simon Cooksey 0:fb7af294d5d9 826
Simon Cooksey 0:fb7af294d5d9 827 if( ! pubkey_done &&
Simon Cooksey 0:fb7af294d5d9 828 ( ret = mbedtls_ecp_mul( &eck->grp, &eck->Q, &eck->d, &eck->grp.G,
Simon Cooksey 0:fb7af294d5d9 829 NULL, NULL ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 830 {
Simon Cooksey 0:fb7af294d5d9 831 mbedtls_ecp_keypair_free( eck );
Simon Cooksey 0:fb7af294d5d9 832 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
Simon Cooksey 0:fb7af294d5d9 833 }
Simon Cooksey 0:fb7af294d5d9 834
Simon Cooksey 0:fb7af294d5d9 835 if( ( ret = mbedtls_ecp_check_privkey( &eck->grp, &eck->d ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 836 {
Simon Cooksey 0:fb7af294d5d9 837 mbedtls_ecp_keypair_free( eck );
Simon Cooksey 0:fb7af294d5d9 838 return( ret );
Simon Cooksey 0:fb7af294d5d9 839 }
Simon Cooksey 0:fb7af294d5d9 840
Simon Cooksey 0:fb7af294d5d9 841 return( 0 );
Simon Cooksey 0:fb7af294d5d9 842 }
Simon Cooksey 0:fb7af294d5d9 843 #endif /* MBEDTLS_ECP_C */
Simon Cooksey 0:fb7af294d5d9 844
Simon Cooksey 0:fb7af294d5d9 845 /*
Simon Cooksey 0:fb7af294d5d9 846 * Parse an unencrypted PKCS#8 encoded private key
Simon Cooksey 0:fb7af294d5d9 847 */
Simon Cooksey 0:fb7af294d5d9 848 static int pk_parse_key_pkcs8_unencrypted_der(
Simon Cooksey 0:fb7af294d5d9 849 mbedtls_pk_context *pk,
Simon Cooksey 0:fb7af294d5d9 850 const unsigned char* key,
Simon Cooksey 0:fb7af294d5d9 851 size_t keylen )
Simon Cooksey 0:fb7af294d5d9 852 {
Simon Cooksey 0:fb7af294d5d9 853 int ret, version;
Simon Cooksey 0:fb7af294d5d9 854 size_t len;
Simon Cooksey 0:fb7af294d5d9 855 mbedtls_asn1_buf params;
Simon Cooksey 0:fb7af294d5d9 856 unsigned char *p = (unsigned char *) key;
Simon Cooksey 0:fb7af294d5d9 857 unsigned char *end = p + keylen;
Simon Cooksey 0:fb7af294d5d9 858 mbedtls_pk_type_t pk_alg = MBEDTLS_PK_NONE;
Simon Cooksey 0:fb7af294d5d9 859 const mbedtls_pk_info_t *pk_info;
Simon Cooksey 0:fb7af294d5d9 860
Simon Cooksey 0:fb7af294d5d9 861 /*
Simon Cooksey 0:fb7af294d5d9 862 * This function parses the PrivatKeyInfo object (PKCS#8 v1.2 = RFC 5208)
Simon Cooksey 0:fb7af294d5d9 863 *
Simon Cooksey 0:fb7af294d5d9 864 * PrivateKeyInfo ::= SEQUENCE {
Simon Cooksey 0:fb7af294d5d9 865 * version Version,
Simon Cooksey 0:fb7af294d5d9 866 * privateKeyAlgorithm PrivateKeyAlgorithmIdentifier,
Simon Cooksey 0:fb7af294d5d9 867 * privateKey PrivateKey,
Simon Cooksey 0:fb7af294d5d9 868 * attributes [0] IMPLICIT Attributes OPTIONAL }
Simon Cooksey 0:fb7af294d5d9 869 *
Simon Cooksey 0:fb7af294d5d9 870 * Version ::= INTEGER
Simon Cooksey 0:fb7af294d5d9 871 * PrivateKeyAlgorithmIdentifier ::= AlgorithmIdentifier
Simon Cooksey 0:fb7af294d5d9 872 * PrivateKey ::= OCTET STRING
Simon Cooksey 0:fb7af294d5d9 873 *
Simon Cooksey 0:fb7af294d5d9 874 * The PrivateKey OCTET STRING is a SEC1 ECPrivateKey
Simon Cooksey 0:fb7af294d5d9 875 */
Simon Cooksey 0:fb7af294d5d9 876
Simon Cooksey 0:fb7af294d5d9 877 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
Simon Cooksey 0:fb7af294d5d9 878 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 879 {
Simon Cooksey 0:fb7af294d5d9 880 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
Simon Cooksey 0:fb7af294d5d9 881 }
Simon Cooksey 0:fb7af294d5d9 882
Simon Cooksey 0:fb7af294d5d9 883 end = p + len;
Simon Cooksey 0:fb7af294d5d9 884
Simon Cooksey 0:fb7af294d5d9 885 if( ( ret = mbedtls_asn1_get_int( &p, end, &version ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 886 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
Simon Cooksey 0:fb7af294d5d9 887
Simon Cooksey 0:fb7af294d5d9 888 if( version != 0 )
Simon Cooksey 0:fb7af294d5d9 889 return( MBEDTLS_ERR_PK_KEY_INVALID_VERSION + ret );
Simon Cooksey 0:fb7af294d5d9 890
Simon Cooksey 0:fb7af294d5d9 891 if( ( ret = pk_get_pk_alg( &p, end, &pk_alg, &params ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 892 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
Simon Cooksey 0:fb7af294d5d9 893
Simon Cooksey 0:fb7af294d5d9 894 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 895 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
Simon Cooksey 0:fb7af294d5d9 896
Simon Cooksey 0:fb7af294d5d9 897 if( len < 1 )
Simon Cooksey 0:fb7af294d5d9 898 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT +
Simon Cooksey 0:fb7af294d5d9 899 MBEDTLS_ERR_ASN1_OUT_OF_DATA );
Simon Cooksey 0:fb7af294d5d9 900
Simon Cooksey 0:fb7af294d5d9 901 if( ( pk_info = mbedtls_pk_info_from_type( pk_alg ) ) == NULL )
Simon Cooksey 0:fb7af294d5d9 902 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
Simon Cooksey 0:fb7af294d5d9 903
Simon Cooksey 0:fb7af294d5d9 904 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 905 return( ret );
Simon Cooksey 0:fb7af294d5d9 906
Simon Cooksey 0:fb7af294d5d9 907 #if defined(MBEDTLS_RSA_C)
Simon Cooksey 0:fb7af294d5d9 908 if( pk_alg == MBEDTLS_PK_RSA )
Simon Cooksey 0:fb7af294d5d9 909 {
Simon Cooksey 0:fb7af294d5d9 910 if( ( ret = pk_parse_key_pkcs1_der( mbedtls_pk_rsa( *pk ), p, len ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 911 {
Simon Cooksey 0:fb7af294d5d9 912 mbedtls_pk_free( pk );
Simon Cooksey 0:fb7af294d5d9 913 return( ret );
Simon Cooksey 0:fb7af294d5d9 914 }
Simon Cooksey 0:fb7af294d5d9 915 } else
Simon Cooksey 0:fb7af294d5d9 916 #endif /* MBEDTLS_RSA_C */
Simon Cooksey 0:fb7af294d5d9 917 #if defined(MBEDTLS_ECP_C)
Simon Cooksey 0:fb7af294d5d9 918 if( pk_alg == MBEDTLS_PK_ECKEY || pk_alg == MBEDTLS_PK_ECKEY_DH )
Simon Cooksey 0:fb7af294d5d9 919 {
Simon Cooksey 0:fb7af294d5d9 920 if( ( ret = pk_use_ecparams( &params, &mbedtls_pk_ec( *pk )->grp ) ) != 0 ||
Simon Cooksey 0:fb7af294d5d9 921 ( ret = pk_parse_key_sec1_der( mbedtls_pk_ec( *pk ), p, len ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 922 {
Simon Cooksey 0:fb7af294d5d9 923 mbedtls_pk_free( pk );
Simon Cooksey 0:fb7af294d5d9 924 return( ret );
Simon Cooksey 0:fb7af294d5d9 925 }
Simon Cooksey 0:fb7af294d5d9 926 } else
Simon Cooksey 0:fb7af294d5d9 927 #endif /* MBEDTLS_ECP_C */
Simon Cooksey 0:fb7af294d5d9 928 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
Simon Cooksey 0:fb7af294d5d9 929
Simon Cooksey 0:fb7af294d5d9 930 return( 0 );
Simon Cooksey 0:fb7af294d5d9 931 }
Simon Cooksey 0:fb7af294d5d9 932
Simon Cooksey 0:fb7af294d5d9 933 /*
Simon Cooksey 0:fb7af294d5d9 934 * Parse an encrypted PKCS#8 encoded private key
Simon Cooksey 0:fb7af294d5d9 935 */
Simon Cooksey 0:fb7af294d5d9 936 #if defined(MBEDTLS_PKCS12_C) || defined(MBEDTLS_PKCS5_C)
Simon Cooksey 0:fb7af294d5d9 937 static int pk_parse_key_pkcs8_encrypted_der(
Simon Cooksey 0:fb7af294d5d9 938 mbedtls_pk_context *pk,
Simon Cooksey 0:fb7af294d5d9 939 const unsigned char *key, size_t keylen,
Simon Cooksey 0:fb7af294d5d9 940 const unsigned char *pwd, size_t pwdlen )
Simon Cooksey 0:fb7af294d5d9 941 {
Simon Cooksey 0:fb7af294d5d9 942 int ret, decrypted = 0;
Simon Cooksey 0:fb7af294d5d9 943 size_t len;
Simon Cooksey 0:fb7af294d5d9 944 unsigned char buf[2048];
Simon Cooksey 0:fb7af294d5d9 945 unsigned char *p, *end;
Simon Cooksey 0:fb7af294d5d9 946 mbedtls_asn1_buf pbe_alg_oid, pbe_params;
Simon Cooksey 0:fb7af294d5d9 947 #if defined(MBEDTLS_PKCS12_C)
Simon Cooksey 0:fb7af294d5d9 948 mbedtls_cipher_type_t cipher_alg;
Simon Cooksey 0:fb7af294d5d9 949 mbedtls_md_type_t md_alg;
Simon Cooksey 0:fb7af294d5d9 950 #endif
Simon Cooksey 0:fb7af294d5d9 951
Simon Cooksey 0:fb7af294d5d9 952 memset( buf, 0, sizeof( buf ) );
Simon Cooksey 0:fb7af294d5d9 953
Simon Cooksey 0:fb7af294d5d9 954 p = (unsigned char *) key;
Simon Cooksey 0:fb7af294d5d9 955 end = p + keylen;
Simon Cooksey 0:fb7af294d5d9 956
Simon Cooksey 0:fb7af294d5d9 957 if( pwdlen == 0 )
Simon Cooksey 0:fb7af294d5d9 958 return( MBEDTLS_ERR_PK_PASSWORD_REQUIRED );
Simon Cooksey 0:fb7af294d5d9 959
Simon Cooksey 0:fb7af294d5d9 960 /*
Simon Cooksey 0:fb7af294d5d9 961 * This function parses the EncryptedPrivatKeyInfo object (PKCS#8)
Simon Cooksey 0:fb7af294d5d9 962 *
Simon Cooksey 0:fb7af294d5d9 963 * EncryptedPrivateKeyInfo ::= SEQUENCE {
Simon Cooksey 0:fb7af294d5d9 964 * encryptionAlgorithm EncryptionAlgorithmIdentifier,
Simon Cooksey 0:fb7af294d5d9 965 * encryptedData EncryptedData
Simon Cooksey 0:fb7af294d5d9 966 * }
Simon Cooksey 0:fb7af294d5d9 967 *
Simon Cooksey 0:fb7af294d5d9 968 * EncryptionAlgorithmIdentifier ::= AlgorithmIdentifier
Simon Cooksey 0:fb7af294d5d9 969 *
Simon Cooksey 0:fb7af294d5d9 970 * EncryptedData ::= OCTET STRING
Simon Cooksey 0:fb7af294d5d9 971 *
Simon Cooksey 0:fb7af294d5d9 972 * The EncryptedData OCTET STRING is a PKCS#8 PrivateKeyInfo
Simon Cooksey 0:fb7af294d5d9 973 */
Simon Cooksey 0:fb7af294d5d9 974 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
Simon Cooksey 0:fb7af294d5d9 975 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 976 {
Simon Cooksey 0:fb7af294d5d9 977 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
Simon Cooksey 0:fb7af294d5d9 978 }
Simon Cooksey 0:fb7af294d5d9 979
Simon Cooksey 0:fb7af294d5d9 980 end = p + len;
Simon Cooksey 0:fb7af294d5d9 981
Simon Cooksey 0:fb7af294d5d9 982 if( ( ret = mbedtls_asn1_get_alg( &p, end, &pbe_alg_oid, &pbe_params ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 983 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
Simon Cooksey 0:fb7af294d5d9 984
Simon Cooksey 0:fb7af294d5d9 985 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 986 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
Simon Cooksey 0:fb7af294d5d9 987
Simon Cooksey 0:fb7af294d5d9 988 if( len > sizeof( buf ) )
Simon Cooksey 0:fb7af294d5d9 989 return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
Simon Cooksey 0:fb7af294d5d9 990
Simon Cooksey 0:fb7af294d5d9 991 /*
Simon Cooksey 0:fb7af294d5d9 992 * Decrypt EncryptedData with appropriate PDE
Simon Cooksey 0:fb7af294d5d9 993 */
Simon Cooksey 0:fb7af294d5d9 994 #if defined(MBEDTLS_PKCS12_C)
Simon Cooksey 0:fb7af294d5d9 995 if( mbedtls_oid_get_pkcs12_pbe_alg( &pbe_alg_oid, &md_alg, &cipher_alg ) == 0 )
Simon Cooksey 0:fb7af294d5d9 996 {
Simon Cooksey 0:fb7af294d5d9 997 if( ( ret = mbedtls_pkcs12_pbe( &pbe_params, MBEDTLS_PKCS12_PBE_DECRYPT,
Simon Cooksey 0:fb7af294d5d9 998 cipher_alg, md_alg,
Simon Cooksey 0:fb7af294d5d9 999 pwd, pwdlen, p, len, buf ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 1000 {
Simon Cooksey 0:fb7af294d5d9 1001 if( ret == MBEDTLS_ERR_PKCS12_PASSWORD_MISMATCH )
Simon Cooksey 0:fb7af294d5d9 1002 return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
Simon Cooksey 0:fb7af294d5d9 1003
Simon Cooksey 0:fb7af294d5d9 1004 return( ret );
Simon Cooksey 0:fb7af294d5d9 1005 }
Simon Cooksey 0:fb7af294d5d9 1006
Simon Cooksey 0:fb7af294d5d9 1007 decrypted = 1;
Simon Cooksey 0:fb7af294d5d9 1008 }
Simon Cooksey 0:fb7af294d5d9 1009 else if( MBEDTLS_OID_CMP( MBEDTLS_OID_PKCS12_PBE_SHA1_RC4_128, &pbe_alg_oid ) == 0 )
Simon Cooksey 0:fb7af294d5d9 1010 {
Simon Cooksey 0:fb7af294d5d9 1011 if( ( ret = mbedtls_pkcs12_pbe_sha1_rc4_128( &pbe_params,
Simon Cooksey 0:fb7af294d5d9 1012 MBEDTLS_PKCS12_PBE_DECRYPT,
Simon Cooksey 0:fb7af294d5d9 1013 pwd, pwdlen,
Simon Cooksey 0:fb7af294d5d9 1014 p, len, buf ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 1015 {
Simon Cooksey 0:fb7af294d5d9 1016 return( ret );
Simon Cooksey 0:fb7af294d5d9 1017 }
Simon Cooksey 0:fb7af294d5d9 1018
Simon Cooksey 0:fb7af294d5d9 1019 // Best guess for password mismatch when using RC4. If first tag is
Simon Cooksey 0:fb7af294d5d9 1020 // not MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE
Simon Cooksey 0:fb7af294d5d9 1021 //
Simon Cooksey 0:fb7af294d5d9 1022 if( *buf != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) )
Simon Cooksey 0:fb7af294d5d9 1023 return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
Simon Cooksey 0:fb7af294d5d9 1024
Simon Cooksey 0:fb7af294d5d9 1025 decrypted = 1;
Simon Cooksey 0:fb7af294d5d9 1026 }
Simon Cooksey 0:fb7af294d5d9 1027 else
Simon Cooksey 0:fb7af294d5d9 1028 #endif /* MBEDTLS_PKCS12_C */
Simon Cooksey 0:fb7af294d5d9 1029 #if defined(MBEDTLS_PKCS5_C)
Simon Cooksey 0:fb7af294d5d9 1030 if( MBEDTLS_OID_CMP( MBEDTLS_OID_PKCS5_PBES2, &pbe_alg_oid ) == 0 )
Simon Cooksey 0:fb7af294d5d9 1031 {
Simon Cooksey 0:fb7af294d5d9 1032 if( ( ret = mbedtls_pkcs5_pbes2( &pbe_params, MBEDTLS_PKCS5_DECRYPT, pwd, pwdlen,
Simon Cooksey 0:fb7af294d5d9 1033 p, len, buf ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 1034 {
Simon Cooksey 0:fb7af294d5d9 1035 if( ret == MBEDTLS_ERR_PKCS5_PASSWORD_MISMATCH )
Simon Cooksey 0:fb7af294d5d9 1036 return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
Simon Cooksey 0:fb7af294d5d9 1037
Simon Cooksey 0:fb7af294d5d9 1038 return( ret );
Simon Cooksey 0:fb7af294d5d9 1039 }
Simon Cooksey 0:fb7af294d5d9 1040
Simon Cooksey 0:fb7af294d5d9 1041 decrypted = 1;
Simon Cooksey 0:fb7af294d5d9 1042 }
Simon Cooksey 0:fb7af294d5d9 1043 else
Simon Cooksey 0:fb7af294d5d9 1044 #endif /* MBEDTLS_PKCS5_C */
Simon Cooksey 0:fb7af294d5d9 1045 {
Simon Cooksey 0:fb7af294d5d9 1046 ((void) pwd);
Simon Cooksey 0:fb7af294d5d9 1047 }
Simon Cooksey 0:fb7af294d5d9 1048
Simon Cooksey 0:fb7af294d5d9 1049 if( decrypted == 0 )
Simon Cooksey 0:fb7af294d5d9 1050 return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
Simon Cooksey 0:fb7af294d5d9 1051
Simon Cooksey 0:fb7af294d5d9 1052 return( pk_parse_key_pkcs8_unencrypted_der( pk, buf, len ) );
Simon Cooksey 0:fb7af294d5d9 1053 }
Simon Cooksey 0:fb7af294d5d9 1054 #endif /* MBEDTLS_PKCS12_C || MBEDTLS_PKCS5_C */
Simon Cooksey 0:fb7af294d5d9 1055
Simon Cooksey 0:fb7af294d5d9 1056 /*
Simon Cooksey 0:fb7af294d5d9 1057 * Parse a private key
Simon Cooksey 0:fb7af294d5d9 1058 */
Simon Cooksey 0:fb7af294d5d9 1059 int mbedtls_pk_parse_key( mbedtls_pk_context *pk,
Simon Cooksey 0:fb7af294d5d9 1060 const unsigned char *key, size_t keylen,
Simon Cooksey 0:fb7af294d5d9 1061 const unsigned char *pwd, size_t pwdlen )
Simon Cooksey 0:fb7af294d5d9 1062 {
Simon Cooksey 0:fb7af294d5d9 1063 int ret;
Simon Cooksey 0:fb7af294d5d9 1064 const mbedtls_pk_info_t *pk_info;
Simon Cooksey 0:fb7af294d5d9 1065
Simon Cooksey 0:fb7af294d5d9 1066 #if defined(MBEDTLS_PEM_PARSE_C)
Simon Cooksey 0:fb7af294d5d9 1067 size_t len;
Simon Cooksey 0:fb7af294d5d9 1068 mbedtls_pem_context pem;
Simon Cooksey 0:fb7af294d5d9 1069
Simon Cooksey 0:fb7af294d5d9 1070 mbedtls_pem_init( &pem );
Simon Cooksey 0:fb7af294d5d9 1071
Simon Cooksey 0:fb7af294d5d9 1072 #if defined(MBEDTLS_RSA_C)
Simon Cooksey 0:fb7af294d5d9 1073 /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
Simon Cooksey 0:fb7af294d5d9 1074 if( keylen == 0 || key[keylen - 1] != '\0' )
Simon Cooksey 0:fb7af294d5d9 1075 ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
Simon Cooksey 0:fb7af294d5d9 1076 else
Simon Cooksey 0:fb7af294d5d9 1077 ret = mbedtls_pem_read_buffer( &pem,
Simon Cooksey 0:fb7af294d5d9 1078 "-----BEGIN RSA PRIVATE KEY-----",
Simon Cooksey 0:fb7af294d5d9 1079 "-----END RSA PRIVATE KEY-----",
Simon Cooksey 0:fb7af294d5d9 1080 key, pwd, pwdlen, &len );
Simon Cooksey 0:fb7af294d5d9 1081
Simon Cooksey 0:fb7af294d5d9 1082 if( ret == 0 )
Simon Cooksey 0:fb7af294d5d9 1083 {
Simon Cooksey 0:fb7af294d5d9 1084 if( ( pk_info = mbedtls_pk_info_from_type( MBEDTLS_PK_RSA ) ) == NULL )
Simon Cooksey 0:fb7af294d5d9 1085 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
Simon Cooksey 0:fb7af294d5d9 1086
Simon Cooksey 0:fb7af294d5d9 1087 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 ||
Simon Cooksey 0:fb7af294d5d9 1088 ( ret = pk_parse_key_pkcs1_der( mbedtls_pk_rsa( *pk ),
Simon Cooksey 0:fb7af294d5d9 1089 pem.buf, pem.buflen ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 1090 {
Simon Cooksey 0:fb7af294d5d9 1091 mbedtls_pk_free( pk );
Simon Cooksey 0:fb7af294d5d9 1092 }
Simon Cooksey 0:fb7af294d5d9 1093
Simon Cooksey 0:fb7af294d5d9 1094 mbedtls_pem_free( &pem );
Simon Cooksey 0:fb7af294d5d9 1095 return( ret );
Simon Cooksey 0:fb7af294d5d9 1096 }
Simon Cooksey 0:fb7af294d5d9 1097 else if( ret == MBEDTLS_ERR_PEM_PASSWORD_MISMATCH )
Simon Cooksey 0:fb7af294d5d9 1098 return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
Simon Cooksey 0:fb7af294d5d9 1099 else if( ret == MBEDTLS_ERR_PEM_PASSWORD_REQUIRED )
Simon Cooksey 0:fb7af294d5d9 1100 return( MBEDTLS_ERR_PK_PASSWORD_REQUIRED );
Simon Cooksey 0:fb7af294d5d9 1101 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
Simon Cooksey 0:fb7af294d5d9 1102 return( ret );
Simon Cooksey 0:fb7af294d5d9 1103 #endif /* MBEDTLS_RSA_C */
Simon Cooksey 0:fb7af294d5d9 1104
Simon Cooksey 0:fb7af294d5d9 1105 #if defined(MBEDTLS_ECP_C)
Simon Cooksey 0:fb7af294d5d9 1106 /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
Simon Cooksey 0:fb7af294d5d9 1107 if( keylen == 0 || key[keylen - 1] != '\0' )
Simon Cooksey 0:fb7af294d5d9 1108 ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
Simon Cooksey 0:fb7af294d5d9 1109 else
Simon Cooksey 0:fb7af294d5d9 1110 ret = mbedtls_pem_read_buffer( &pem,
Simon Cooksey 0:fb7af294d5d9 1111 "-----BEGIN EC PRIVATE KEY-----",
Simon Cooksey 0:fb7af294d5d9 1112 "-----END EC PRIVATE KEY-----",
Simon Cooksey 0:fb7af294d5d9 1113 key, pwd, pwdlen, &len );
Simon Cooksey 0:fb7af294d5d9 1114 if( ret == 0 )
Simon Cooksey 0:fb7af294d5d9 1115 {
Simon Cooksey 0:fb7af294d5d9 1116 if( ( pk_info = mbedtls_pk_info_from_type( MBEDTLS_PK_ECKEY ) ) == NULL )
Simon Cooksey 0:fb7af294d5d9 1117 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
Simon Cooksey 0:fb7af294d5d9 1118
Simon Cooksey 0:fb7af294d5d9 1119 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 ||
Simon Cooksey 0:fb7af294d5d9 1120 ( ret = pk_parse_key_sec1_der( mbedtls_pk_ec( *pk ),
Simon Cooksey 0:fb7af294d5d9 1121 pem.buf, pem.buflen ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 1122 {
Simon Cooksey 0:fb7af294d5d9 1123 mbedtls_pk_free( pk );
Simon Cooksey 0:fb7af294d5d9 1124 }
Simon Cooksey 0:fb7af294d5d9 1125
Simon Cooksey 0:fb7af294d5d9 1126 mbedtls_pem_free( &pem );
Simon Cooksey 0:fb7af294d5d9 1127 return( ret );
Simon Cooksey 0:fb7af294d5d9 1128 }
Simon Cooksey 0:fb7af294d5d9 1129 else if( ret == MBEDTLS_ERR_PEM_PASSWORD_MISMATCH )
Simon Cooksey 0:fb7af294d5d9 1130 return( MBEDTLS_ERR_PK_PASSWORD_MISMATCH );
Simon Cooksey 0:fb7af294d5d9 1131 else if( ret == MBEDTLS_ERR_PEM_PASSWORD_REQUIRED )
Simon Cooksey 0:fb7af294d5d9 1132 return( MBEDTLS_ERR_PK_PASSWORD_REQUIRED );
Simon Cooksey 0:fb7af294d5d9 1133 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
Simon Cooksey 0:fb7af294d5d9 1134 return( ret );
Simon Cooksey 0:fb7af294d5d9 1135 #endif /* MBEDTLS_ECP_C */
Simon Cooksey 0:fb7af294d5d9 1136
Simon Cooksey 0:fb7af294d5d9 1137 /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
Simon Cooksey 0:fb7af294d5d9 1138 if( keylen == 0 || key[keylen - 1] != '\0' )
Simon Cooksey 0:fb7af294d5d9 1139 ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
Simon Cooksey 0:fb7af294d5d9 1140 else
Simon Cooksey 0:fb7af294d5d9 1141 ret = mbedtls_pem_read_buffer( &pem,
Simon Cooksey 0:fb7af294d5d9 1142 "-----BEGIN PRIVATE KEY-----",
Simon Cooksey 0:fb7af294d5d9 1143 "-----END PRIVATE KEY-----",
Simon Cooksey 0:fb7af294d5d9 1144 key, NULL, 0, &len );
Simon Cooksey 0:fb7af294d5d9 1145 if( ret == 0 )
Simon Cooksey 0:fb7af294d5d9 1146 {
Simon Cooksey 0:fb7af294d5d9 1147 if( ( ret = pk_parse_key_pkcs8_unencrypted_der( pk,
Simon Cooksey 0:fb7af294d5d9 1148 pem.buf, pem.buflen ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 1149 {
Simon Cooksey 0:fb7af294d5d9 1150 mbedtls_pk_free( pk );
Simon Cooksey 0:fb7af294d5d9 1151 }
Simon Cooksey 0:fb7af294d5d9 1152
Simon Cooksey 0:fb7af294d5d9 1153 mbedtls_pem_free( &pem );
Simon Cooksey 0:fb7af294d5d9 1154 return( ret );
Simon Cooksey 0:fb7af294d5d9 1155 }
Simon Cooksey 0:fb7af294d5d9 1156 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
Simon Cooksey 0:fb7af294d5d9 1157 return( ret );
Simon Cooksey 0:fb7af294d5d9 1158
Simon Cooksey 0:fb7af294d5d9 1159 #if defined(MBEDTLS_PKCS12_C) || defined(MBEDTLS_PKCS5_C)
Simon Cooksey 0:fb7af294d5d9 1160 /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
Simon Cooksey 0:fb7af294d5d9 1161 if( keylen == 0 || key[keylen - 1] != '\0' )
Simon Cooksey 0:fb7af294d5d9 1162 ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
Simon Cooksey 0:fb7af294d5d9 1163 else
Simon Cooksey 0:fb7af294d5d9 1164 ret = mbedtls_pem_read_buffer( &pem,
Simon Cooksey 0:fb7af294d5d9 1165 "-----BEGIN ENCRYPTED PRIVATE KEY-----",
Simon Cooksey 0:fb7af294d5d9 1166 "-----END ENCRYPTED PRIVATE KEY-----",
Simon Cooksey 0:fb7af294d5d9 1167 key, NULL, 0, &len );
Simon Cooksey 0:fb7af294d5d9 1168 if( ret == 0 )
Simon Cooksey 0:fb7af294d5d9 1169 {
Simon Cooksey 0:fb7af294d5d9 1170 if( ( ret = pk_parse_key_pkcs8_encrypted_der( pk,
Simon Cooksey 0:fb7af294d5d9 1171 pem.buf, pem.buflen,
Simon Cooksey 0:fb7af294d5d9 1172 pwd, pwdlen ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 1173 {
Simon Cooksey 0:fb7af294d5d9 1174 mbedtls_pk_free( pk );
Simon Cooksey 0:fb7af294d5d9 1175 }
Simon Cooksey 0:fb7af294d5d9 1176
Simon Cooksey 0:fb7af294d5d9 1177 mbedtls_pem_free( &pem );
Simon Cooksey 0:fb7af294d5d9 1178 return( ret );
Simon Cooksey 0:fb7af294d5d9 1179 }
Simon Cooksey 0:fb7af294d5d9 1180 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
Simon Cooksey 0:fb7af294d5d9 1181 return( ret );
Simon Cooksey 0:fb7af294d5d9 1182 #endif /* MBEDTLS_PKCS12_C || MBEDTLS_PKCS5_C */
Simon Cooksey 0:fb7af294d5d9 1183 #else
Simon Cooksey 0:fb7af294d5d9 1184 ((void) ret);
Simon Cooksey 0:fb7af294d5d9 1185 ((void) pwd);
Simon Cooksey 0:fb7af294d5d9 1186 ((void) pwdlen);
Simon Cooksey 0:fb7af294d5d9 1187 #endif /* MBEDTLS_PEM_PARSE_C */
Simon Cooksey 0:fb7af294d5d9 1188
Simon Cooksey 0:fb7af294d5d9 1189 /*
Simon Cooksey 0:fb7af294d5d9 1190 * At this point we only know it's not a PEM formatted key. Could be any
Simon Cooksey 0:fb7af294d5d9 1191 * of the known DER encoded private key formats
Simon Cooksey 0:fb7af294d5d9 1192 *
Simon Cooksey 0:fb7af294d5d9 1193 * We try the different DER format parsers to see if one passes without
Simon Cooksey 0:fb7af294d5d9 1194 * error
Simon Cooksey 0:fb7af294d5d9 1195 */
Simon Cooksey 0:fb7af294d5d9 1196 #if defined(MBEDTLS_PKCS12_C) || defined(MBEDTLS_PKCS5_C)
Simon Cooksey 0:fb7af294d5d9 1197 if( ( ret = pk_parse_key_pkcs8_encrypted_der( pk, key, keylen,
Simon Cooksey 0:fb7af294d5d9 1198 pwd, pwdlen ) ) == 0 )
Simon Cooksey 0:fb7af294d5d9 1199 {
Simon Cooksey 0:fb7af294d5d9 1200 return( 0 );
Simon Cooksey 0:fb7af294d5d9 1201 }
Simon Cooksey 0:fb7af294d5d9 1202
Simon Cooksey 0:fb7af294d5d9 1203 mbedtls_pk_free( pk );
Simon Cooksey 0:fb7af294d5d9 1204
Simon Cooksey 0:fb7af294d5d9 1205 if( ret == MBEDTLS_ERR_PK_PASSWORD_MISMATCH )
Simon Cooksey 0:fb7af294d5d9 1206 {
Simon Cooksey 0:fb7af294d5d9 1207 return( ret );
Simon Cooksey 0:fb7af294d5d9 1208 }
Simon Cooksey 0:fb7af294d5d9 1209 #endif /* MBEDTLS_PKCS12_C || MBEDTLS_PKCS5_C */
Simon Cooksey 0:fb7af294d5d9 1210
Simon Cooksey 0:fb7af294d5d9 1211 if( ( ret = pk_parse_key_pkcs8_unencrypted_der( pk, key, keylen ) ) == 0 )
Simon Cooksey 0:fb7af294d5d9 1212 return( 0 );
Simon Cooksey 0:fb7af294d5d9 1213
Simon Cooksey 0:fb7af294d5d9 1214 mbedtls_pk_free( pk );
Simon Cooksey 0:fb7af294d5d9 1215
Simon Cooksey 0:fb7af294d5d9 1216 #if defined(MBEDTLS_RSA_C)
Simon Cooksey 0:fb7af294d5d9 1217 if( ( pk_info = mbedtls_pk_info_from_type( MBEDTLS_PK_RSA ) ) == NULL )
Simon Cooksey 0:fb7af294d5d9 1218 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
Simon Cooksey 0:fb7af294d5d9 1219
Simon Cooksey 0:fb7af294d5d9 1220 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 ||
Simon Cooksey 0:fb7af294d5d9 1221 ( ret = pk_parse_key_pkcs1_der( mbedtls_pk_rsa( *pk ), key, keylen ) ) == 0 )
Simon Cooksey 0:fb7af294d5d9 1222 {
Simon Cooksey 0:fb7af294d5d9 1223 return( 0 );
Simon Cooksey 0:fb7af294d5d9 1224 }
Simon Cooksey 0:fb7af294d5d9 1225
Simon Cooksey 0:fb7af294d5d9 1226 mbedtls_pk_free( pk );
Simon Cooksey 0:fb7af294d5d9 1227 #endif /* MBEDTLS_RSA_C */
Simon Cooksey 0:fb7af294d5d9 1228
Simon Cooksey 0:fb7af294d5d9 1229 #if defined(MBEDTLS_ECP_C)
Simon Cooksey 0:fb7af294d5d9 1230 if( ( pk_info = mbedtls_pk_info_from_type( MBEDTLS_PK_ECKEY ) ) == NULL )
Simon Cooksey 0:fb7af294d5d9 1231 return( MBEDTLS_ERR_PK_UNKNOWN_PK_ALG );
Simon Cooksey 0:fb7af294d5d9 1232
Simon Cooksey 0:fb7af294d5d9 1233 if( ( ret = mbedtls_pk_setup( pk, pk_info ) ) != 0 ||
Simon Cooksey 0:fb7af294d5d9 1234 ( ret = pk_parse_key_sec1_der( mbedtls_pk_ec( *pk ), key, keylen ) ) == 0 )
Simon Cooksey 0:fb7af294d5d9 1235 {
Simon Cooksey 0:fb7af294d5d9 1236 return( 0 );
Simon Cooksey 0:fb7af294d5d9 1237 }
Simon Cooksey 0:fb7af294d5d9 1238
Simon Cooksey 0:fb7af294d5d9 1239 mbedtls_pk_free( pk );
Simon Cooksey 0:fb7af294d5d9 1240 #endif /* MBEDTLS_ECP_C */
Simon Cooksey 0:fb7af294d5d9 1241
Simon Cooksey 0:fb7af294d5d9 1242 return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
Simon Cooksey 0:fb7af294d5d9 1243 }
Simon Cooksey 0:fb7af294d5d9 1244
Simon Cooksey 0:fb7af294d5d9 1245 /*
Simon Cooksey 0:fb7af294d5d9 1246 * Parse a public key
Simon Cooksey 0:fb7af294d5d9 1247 */
Simon Cooksey 0:fb7af294d5d9 1248 int mbedtls_pk_parse_public_key( mbedtls_pk_context *ctx,
Simon Cooksey 0:fb7af294d5d9 1249 const unsigned char *key, size_t keylen )
Simon Cooksey 0:fb7af294d5d9 1250 {
Simon Cooksey 0:fb7af294d5d9 1251 int ret;
Simon Cooksey 0:fb7af294d5d9 1252 unsigned char *p;
Simon Cooksey 0:fb7af294d5d9 1253 #if defined(MBEDTLS_PEM_PARSE_C)
Simon Cooksey 0:fb7af294d5d9 1254 size_t len;
Simon Cooksey 0:fb7af294d5d9 1255 mbedtls_pem_context pem;
Simon Cooksey 0:fb7af294d5d9 1256
Simon Cooksey 0:fb7af294d5d9 1257 mbedtls_pem_init( &pem );
Simon Cooksey 0:fb7af294d5d9 1258
Simon Cooksey 0:fb7af294d5d9 1259 /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
Simon Cooksey 0:fb7af294d5d9 1260 if( keylen == 0 || key[keylen - 1] != '\0' )
Simon Cooksey 0:fb7af294d5d9 1261 ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
Simon Cooksey 0:fb7af294d5d9 1262 else
Simon Cooksey 0:fb7af294d5d9 1263 ret = mbedtls_pem_read_buffer( &pem,
Simon Cooksey 0:fb7af294d5d9 1264 "-----BEGIN PUBLIC KEY-----",
Simon Cooksey 0:fb7af294d5d9 1265 "-----END PUBLIC KEY-----",
Simon Cooksey 0:fb7af294d5d9 1266 key, NULL, 0, &len );
Simon Cooksey 0:fb7af294d5d9 1267
Simon Cooksey 0:fb7af294d5d9 1268 if( ret == 0 )
Simon Cooksey 0:fb7af294d5d9 1269 {
Simon Cooksey 0:fb7af294d5d9 1270 /*
Simon Cooksey 0:fb7af294d5d9 1271 * Was PEM encoded
Simon Cooksey 0:fb7af294d5d9 1272 */
Simon Cooksey 0:fb7af294d5d9 1273 key = pem.buf;
Simon Cooksey 0:fb7af294d5d9 1274 keylen = pem.buflen;
Simon Cooksey 0:fb7af294d5d9 1275 }
Simon Cooksey 0:fb7af294d5d9 1276 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
Simon Cooksey 0:fb7af294d5d9 1277 {
Simon Cooksey 0:fb7af294d5d9 1278 mbedtls_pem_free( &pem );
Simon Cooksey 0:fb7af294d5d9 1279 return( ret );
Simon Cooksey 0:fb7af294d5d9 1280 }
Simon Cooksey 0:fb7af294d5d9 1281 #endif /* MBEDTLS_PEM_PARSE_C */
Simon Cooksey 0:fb7af294d5d9 1282 p = (unsigned char *) key;
Simon Cooksey 0:fb7af294d5d9 1283
Simon Cooksey 0:fb7af294d5d9 1284 ret = mbedtls_pk_parse_subpubkey( &p, p + keylen, ctx );
Simon Cooksey 0:fb7af294d5d9 1285
Simon Cooksey 0:fb7af294d5d9 1286 #if defined(MBEDTLS_PEM_PARSE_C)
Simon Cooksey 0:fb7af294d5d9 1287 mbedtls_pem_free( &pem );
Simon Cooksey 0:fb7af294d5d9 1288 #endif
Simon Cooksey 0:fb7af294d5d9 1289
Simon Cooksey 0:fb7af294d5d9 1290 return( ret );
Simon Cooksey 0:fb7af294d5d9 1291 }
Simon Cooksey 0:fb7af294d5d9 1292
Simon Cooksey 0:fb7af294d5d9 1293 #endif /* MBEDTLS_PK_PARSE_C */