Maxim nexpaq / nexpaq_dev

Preliminary main mbed library for nexpaq development

features/mbedtls/src/pem.c@1:d96dbedaebdb, 2016-11-04 (annotated)

Committer:
nexpaq
Date:
Fri Nov 04 20:54:50 2016 +0000
Revision:
1:d96dbedaebdb
Parent:
0:6c56fb4bc5f0 
Removed extra directories for other platforms

Who changed what in which revision?

UserRevisionLine numberNew contents of line
nexpaq 0:6c56fb4bc5f0 1 /*
nexpaq 0:6c56fb4bc5f0 2 * Privacy Enhanced Mail (PEM) decoding
nexpaq 0:6c56fb4bc5f0 3 *
nexpaq 0:6c56fb4bc5f0 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
nexpaq 0:6c56fb4bc5f0 5 * SPDX-License-Identifier: Apache-2.0
nexpaq 0:6c56fb4bc5f0 6 *
nexpaq 0:6c56fb4bc5f0 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
nexpaq 0:6c56fb4bc5f0 8 * not use this file except in compliance with the License.
nexpaq 0:6c56fb4bc5f0 9 * You may obtain a copy of the License at
nexpaq 0:6c56fb4bc5f0 10 *
nexpaq 0:6c56fb4bc5f0 11 * http://www.apache.org/licenses/LICENSE-2.0
nexpaq 0:6c56fb4bc5f0 12 *
nexpaq 0:6c56fb4bc5f0 13 * Unless required by applicable law or agreed to in writing, software
nexpaq 0:6c56fb4bc5f0 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
nexpaq 0:6c56fb4bc5f0 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
nexpaq 0:6c56fb4bc5f0 16 * See the License for the specific language governing permissions and
nexpaq 0:6c56fb4bc5f0 17 * limitations under the License.
nexpaq 0:6c56fb4bc5f0 18 *
nexpaq 0:6c56fb4bc5f0 19 * This file is part of mbed TLS (https://tls.mbed.org)
nexpaq 0:6c56fb4bc5f0 20 */
nexpaq 0:6c56fb4bc5f0 21
nexpaq 0:6c56fb4bc5f0 22 #if !defined(MBEDTLS_CONFIG_FILE)
nexpaq 0:6c56fb4bc5f0 23 #include "mbedtls/config.h"
nexpaq 0:6c56fb4bc5f0 24 #else
nexpaq 0:6c56fb4bc5f0 25 #include MBEDTLS_CONFIG_FILE
nexpaq 0:6c56fb4bc5f0 26 #endif
nexpaq 0:6c56fb4bc5f0 27
nexpaq 0:6c56fb4bc5f0 28 #if defined(MBEDTLS_PEM_PARSE_C) || defined(MBEDTLS_PEM_WRITE_C)
nexpaq 0:6c56fb4bc5f0 29
nexpaq 0:6c56fb4bc5f0 30 #include "mbedtls/pem.h"
nexpaq 0:6c56fb4bc5f0 31 #include "mbedtls/base64.h"
nexpaq 0:6c56fb4bc5f0 32 #include "mbedtls/des.h"
nexpaq 0:6c56fb4bc5f0 33 #include "mbedtls/aes.h"
nexpaq 0:6c56fb4bc5f0 34 #include "mbedtls/md5.h"
nexpaq 0:6c56fb4bc5f0 35 #include "mbedtls/cipher.h"
nexpaq 0:6c56fb4bc5f0 36
nexpaq 0:6c56fb4bc5f0 37 #include <string.h>
nexpaq 0:6c56fb4bc5f0 38
nexpaq 0:6c56fb4bc5f0 39 #if defined(MBEDTLS_PLATFORM_C)
nexpaq 0:6c56fb4bc5f0 40 #include "mbedtls/platform.h"
nexpaq 0:6c56fb4bc5f0 41 #else
nexpaq 0:6c56fb4bc5f0 42 #include <stdlib.h>
nexpaq 0:6c56fb4bc5f0 43 #define mbedtls_calloc calloc
nexpaq 0:6c56fb4bc5f0 44 #define mbedtls_free free
nexpaq 0:6c56fb4bc5f0 45 #endif
nexpaq 0:6c56fb4bc5f0 46
nexpaq 0:6c56fb4bc5f0 47 /* Implementation that should never be optimized out by the compiler */
nexpaq 0:6c56fb4bc5f0 48 static void mbedtls_zeroize( void *v, size_t n ) {
nexpaq 0:6c56fb4bc5f0 49 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
nexpaq 0:6c56fb4bc5f0 50 }
nexpaq 0:6c56fb4bc5f0 51
nexpaq 0:6c56fb4bc5f0 52 #if defined(MBEDTLS_PEM_PARSE_C)
nexpaq 0:6c56fb4bc5f0 53 void mbedtls_pem_init( mbedtls_pem_context *ctx )
nexpaq 0:6c56fb4bc5f0 54 {
nexpaq 0:6c56fb4bc5f0 55 memset( ctx, 0, sizeof( mbedtls_pem_context ) );
nexpaq 0:6c56fb4bc5f0 56 }
nexpaq 0:6c56fb4bc5f0 57
nexpaq 0:6c56fb4bc5f0 58 #if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
nexpaq 0:6c56fb4bc5f0 59 ( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
nexpaq 0:6c56fb4bc5f0 60 /*
nexpaq 0:6c56fb4bc5f0 61 * Read a 16-byte hex string and convert it to binary
nexpaq 0:6c56fb4bc5f0 62 */
nexpaq 0:6c56fb4bc5f0 63 static int pem_get_iv( const unsigned char *s, unsigned char *iv,
nexpaq 0:6c56fb4bc5f0 64 size_t iv_len )
nexpaq 0:6c56fb4bc5f0 65 {
nexpaq 0:6c56fb4bc5f0 66 size_t i, j, k;
nexpaq 0:6c56fb4bc5f0 67
nexpaq 0:6c56fb4bc5f0 68 memset( iv, 0, iv_len );
nexpaq 0:6c56fb4bc5f0 69
nexpaq 0:6c56fb4bc5f0 70 for( i = 0; i < iv_len * 2; i++, s++ )
nexpaq 0:6c56fb4bc5f0 71 {
nexpaq 0:6c56fb4bc5f0 72 if( *s >= '0' && *s <= '9' ) j = *s - '0'; else
nexpaq 0:6c56fb4bc5f0 73 if( *s >= 'A' && *s <= 'F' ) j = *s - '7'; else
nexpaq 0:6c56fb4bc5f0 74 if( *s >= 'a' && *s <= 'f' ) j = *s - 'W'; else
nexpaq 0:6c56fb4bc5f0 75 return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
nexpaq 0:6c56fb4bc5f0 76
nexpaq 0:6c56fb4bc5f0 77 k = ( ( i & 1 ) != 0 ) ? j : j << 4;
nexpaq 0:6c56fb4bc5f0 78
nexpaq 0:6c56fb4bc5f0 79 iv[i >> 1] = (unsigned char)( iv[i >> 1] | k );
nexpaq 0:6c56fb4bc5f0 80 }
nexpaq 0:6c56fb4bc5f0 81
nexpaq 0:6c56fb4bc5f0 82 return( 0 );
nexpaq 0:6c56fb4bc5f0 83 }
nexpaq 0:6c56fb4bc5f0 84
nexpaq 0:6c56fb4bc5f0 85 static void pem_pbkdf1( unsigned char *key, size_t keylen,
nexpaq 0:6c56fb4bc5f0 86 unsigned char *iv,
nexpaq 0:6c56fb4bc5f0 87 const unsigned char *pwd, size_t pwdlen )
nexpaq 0:6c56fb4bc5f0 88 {
nexpaq 0:6c56fb4bc5f0 89 mbedtls_md5_context md5_ctx;
nexpaq 0:6c56fb4bc5f0 90 unsigned char md5sum[16];
nexpaq 0:6c56fb4bc5f0 91 size_t use_len;
nexpaq 0:6c56fb4bc5f0 92
nexpaq 0:6c56fb4bc5f0 93 mbedtls_md5_init( &md5_ctx );
nexpaq 0:6c56fb4bc5f0 94
nexpaq 0:6c56fb4bc5f0 95 /*
nexpaq 0:6c56fb4bc5f0 96 * key[ 0..15] = MD5(pwd || IV)
nexpaq 0:6c56fb4bc5f0 97 */
nexpaq 0:6c56fb4bc5f0 98 mbedtls_md5_starts( &md5_ctx );
nexpaq 0:6c56fb4bc5f0 99 mbedtls_md5_update( &md5_ctx, pwd, pwdlen );
nexpaq 0:6c56fb4bc5f0 100 mbedtls_md5_update( &md5_ctx, iv, 8 );
nexpaq 0:6c56fb4bc5f0 101 mbedtls_md5_finish( &md5_ctx, md5sum );
nexpaq 0:6c56fb4bc5f0 102
nexpaq 0:6c56fb4bc5f0 103 if( keylen <= 16 )
nexpaq 0:6c56fb4bc5f0 104 {
nexpaq 0:6c56fb4bc5f0 105 memcpy( key, md5sum, keylen );
nexpaq 0:6c56fb4bc5f0 106
nexpaq 0:6c56fb4bc5f0 107 mbedtls_md5_free( &md5_ctx );
nexpaq 0:6c56fb4bc5f0 108 mbedtls_zeroize( md5sum, 16 );
nexpaq 0:6c56fb4bc5f0 109 return;
nexpaq 0:6c56fb4bc5f0 110 }
nexpaq 0:6c56fb4bc5f0 111
nexpaq 0:6c56fb4bc5f0 112 memcpy( key, md5sum, 16 );
nexpaq 0:6c56fb4bc5f0 113
nexpaq 0:6c56fb4bc5f0 114 /*
nexpaq 0:6c56fb4bc5f0 115 * key[16..23] = MD5(key[ 0..15] || pwd || IV])
nexpaq 0:6c56fb4bc5f0 116 */
nexpaq 0:6c56fb4bc5f0 117 mbedtls_md5_starts( &md5_ctx );
nexpaq 0:6c56fb4bc5f0 118 mbedtls_md5_update( &md5_ctx, md5sum, 16 );
nexpaq 0:6c56fb4bc5f0 119 mbedtls_md5_update( &md5_ctx, pwd, pwdlen );
nexpaq 0:6c56fb4bc5f0 120 mbedtls_md5_update( &md5_ctx, iv, 8 );
nexpaq 0:6c56fb4bc5f0 121 mbedtls_md5_finish( &md5_ctx, md5sum );
nexpaq 0:6c56fb4bc5f0 122
nexpaq 0:6c56fb4bc5f0 123 use_len = 16;
nexpaq 0:6c56fb4bc5f0 124 if( keylen < 32 )
nexpaq 0:6c56fb4bc5f0 125 use_len = keylen - 16;
nexpaq 0:6c56fb4bc5f0 126
nexpaq 0:6c56fb4bc5f0 127 memcpy( key + 16, md5sum, use_len );
nexpaq 0:6c56fb4bc5f0 128
nexpaq 0:6c56fb4bc5f0 129 mbedtls_md5_free( &md5_ctx );
nexpaq 0:6c56fb4bc5f0 130 mbedtls_zeroize( md5sum, 16 );
nexpaq 0:6c56fb4bc5f0 131 }
nexpaq 0:6c56fb4bc5f0 132
nexpaq 0:6c56fb4bc5f0 133 #if defined(MBEDTLS_DES_C)
nexpaq 0:6c56fb4bc5f0 134 /*
nexpaq 0:6c56fb4bc5f0 135 * Decrypt with DES-CBC, using PBKDF1 for key derivation
nexpaq 0:6c56fb4bc5f0 136 */
nexpaq 0:6c56fb4bc5f0 137 static void pem_des_decrypt( unsigned char des_iv[8],
nexpaq 0:6c56fb4bc5f0 138 unsigned char *buf, size_t buflen,
nexpaq 0:6c56fb4bc5f0 139 const unsigned char *pwd, size_t pwdlen )
nexpaq 0:6c56fb4bc5f0 140 {
nexpaq 0:6c56fb4bc5f0 141 mbedtls_des_context des_ctx;
nexpaq 0:6c56fb4bc5f0 142 unsigned char des_key[8];
nexpaq 0:6c56fb4bc5f0 143
nexpaq 0:6c56fb4bc5f0 144 mbedtls_des_init( &des_ctx );
nexpaq 0:6c56fb4bc5f0 145
nexpaq 0:6c56fb4bc5f0 146 pem_pbkdf1( des_key, 8, des_iv, pwd, pwdlen );
nexpaq 0:6c56fb4bc5f0 147
nexpaq 0:6c56fb4bc5f0 148 mbedtls_des_setkey_dec( &des_ctx, des_key );
nexpaq 0:6c56fb4bc5f0 149 mbedtls_des_crypt_cbc( &des_ctx, MBEDTLS_DES_DECRYPT, buflen,
nexpaq 0:6c56fb4bc5f0 150 des_iv, buf, buf );
nexpaq 0:6c56fb4bc5f0 151
nexpaq 0:6c56fb4bc5f0 152 mbedtls_des_free( &des_ctx );
nexpaq 0:6c56fb4bc5f0 153 mbedtls_zeroize( des_key, 8 );
nexpaq 0:6c56fb4bc5f0 154 }
nexpaq 0:6c56fb4bc5f0 155
nexpaq 0:6c56fb4bc5f0 156 /*
nexpaq 0:6c56fb4bc5f0 157 * Decrypt with 3DES-CBC, using PBKDF1 for key derivation
nexpaq 0:6c56fb4bc5f0 158 */
nexpaq 0:6c56fb4bc5f0 159 static void pem_des3_decrypt( unsigned char des3_iv[8],
nexpaq 0:6c56fb4bc5f0 160 unsigned char *buf, size_t buflen,
nexpaq 0:6c56fb4bc5f0 161 const unsigned char *pwd, size_t pwdlen )
nexpaq 0:6c56fb4bc5f0 162 {
nexpaq 0:6c56fb4bc5f0 163 mbedtls_des3_context des3_ctx;
nexpaq 0:6c56fb4bc5f0 164 unsigned char des3_key[24];
nexpaq 0:6c56fb4bc5f0 165
nexpaq 0:6c56fb4bc5f0 166 mbedtls_des3_init( &des3_ctx );
nexpaq 0:6c56fb4bc5f0 167
nexpaq 0:6c56fb4bc5f0 168 pem_pbkdf1( des3_key, 24, des3_iv, pwd, pwdlen );
nexpaq 0:6c56fb4bc5f0 169
nexpaq 0:6c56fb4bc5f0 170 mbedtls_des3_set3key_dec( &des3_ctx, des3_key );
nexpaq 0:6c56fb4bc5f0 171 mbedtls_des3_crypt_cbc( &des3_ctx, MBEDTLS_DES_DECRYPT, buflen,
nexpaq 0:6c56fb4bc5f0 172 des3_iv, buf, buf );
nexpaq 0:6c56fb4bc5f0 173
nexpaq 0:6c56fb4bc5f0 174 mbedtls_des3_free( &des3_ctx );
nexpaq 0:6c56fb4bc5f0 175 mbedtls_zeroize( des3_key, 24 );
nexpaq 0:6c56fb4bc5f0 176 }
nexpaq 0:6c56fb4bc5f0 177 #endif /* MBEDTLS_DES_C */
nexpaq 0:6c56fb4bc5f0 178
nexpaq 0:6c56fb4bc5f0 179 #if defined(MBEDTLS_AES_C)
nexpaq 0:6c56fb4bc5f0 180 /*
nexpaq 0:6c56fb4bc5f0 181 * Decrypt with AES-XXX-CBC, using PBKDF1 for key derivation
nexpaq 0:6c56fb4bc5f0 182 */
nexpaq 0:6c56fb4bc5f0 183 static void pem_aes_decrypt( unsigned char aes_iv[16], unsigned int keylen,
nexpaq 0:6c56fb4bc5f0 184 unsigned char *buf, size_t buflen,
nexpaq 0:6c56fb4bc5f0 185 const unsigned char *pwd, size_t pwdlen )
nexpaq 0:6c56fb4bc5f0 186 {
nexpaq 0:6c56fb4bc5f0 187 mbedtls_aes_context aes_ctx;
nexpaq 0:6c56fb4bc5f0 188 unsigned char aes_key[32];
nexpaq 0:6c56fb4bc5f0 189
nexpaq 0:6c56fb4bc5f0 190 mbedtls_aes_init( &aes_ctx );
nexpaq 0:6c56fb4bc5f0 191
nexpaq 0:6c56fb4bc5f0 192 pem_pbkdf1( aes_key, keylen, aes_iv, pwd, pwdlen );
nexpaq 0:6c56fb4bc5f0 193
nexpaq 0:6c56fb4bc5f0 194 mbedtls_aes_setkey_dec( &aes_ctx, aes_key, keylen * 8 );
nexpaq 0:6c56fb4bc5f0 195 mbedtls_aes_crypt_cbc( &aes_ctx, MBEDTLS_AES_DECRYPT, buflen,
nexpaq 0:6c56fb4bc5f0 196 aes_iv, buf, buf );
nexpaq 0:6c56fb4bc5f0 197
nexpaq 0:6c56fb4bc5f0 198 mbedtls_aes_free( &aes_ctx );
nexpaq 0:6c56fb4bc5f0 199 mbedtls_zeroize( aes_key, keylen );
nexpaq 0:6c56fb4bc5f0 200 }
nexpaq 0:6c56fb4bc5f0 201 #endif /* MBEDTLS_AES_C */
nexpaq 0:6c56fb4bc5f0 202
nexpaq 0:6c56fb4bc5f0 203 #endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
nexpaq 0:6c56fb4bc5f0 204 ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
nexpaq 0:6c56fb4bc5f0 205
nexpaq 0:6c56fb4bc5f0 206 int mbedtls_pem_read_buffer( mbedtls_pem_context *ctx, const char *header, const char *footer,
nexpaq 0:6c56fb4bc5f0 207 const unsigned char *data, const unsigned char *pwd,
nexpaq 0:6c56fb4bc5f0 208 size_t pwdlen, size_t *use_len )
nexpaq 0:6c56fb4bc5f0 209 {
nexpaq 0:6c56fb4bc5f0 210 int ret, enc;
nexpaq 0:6c56fb4bc5f0 211 size_t len;
nexpaq 0:6c56fb4bc5f0 212 unsigned char *buf;
nexpaq 0:6c56fb4bc5f0 213 const unsigned char *s1, *s2, *end;
nexpaq 0:6c56fb4bc5f0 214 #if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
nexpaq 0:6c56fb4bc5f0 215 ( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
nexpaq 0:6c56fb4bc5f0 216 unsigned char pem_iv[16];
nexpaq 0:6c56fb4bc5f0 217 mbedtls_cipher_type_t enc_alg = MBEDTLS_CIPHER_NONE;
nexpaq 0:6c56fb4bc5f0 218 #else
nexpaq 0:6c56fb4bc5f0 219 ((void) pwd);
nexpaq 0:6c56fb4bc5f0 220 ((void) pwdlen);
nexpaq 0:6c56fb4bc5f0 221 #endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
nexpaq 0:6c56fb4bc5f0 222 ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
nexpaq 0:6c56fb4bc5f0 223
nexpaq 0:6c56fb4bc5f0 224 if( ctx == NULL )
nexpaq 0:6c56fb4bc5f0 225 return( MBEDTLS_ERR_PEM_BAD_INPUT_DATA );
nexpaq 0:6c56fb4bc5f0 226
nexpaq 0:6c56fb4bc5f0 227 s1 = (unsigned char *) strstr( (const char *) data, header );
nexpaq 0:6c56fb4bc5f0 228
nexpaq 0:6c56fb4bc5f0 229 if( s1 == NULL )
nexpaq 0:6c56fb4bc5f0 230 return( MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT );
nexpaq 0:6c56fb4bc5f0 231
nexpaq 0:6c56fb4bc5f0 232 s2 = (unsigned char *) strstr( (const char *) data, footer );
nexpaq 0:6c56fb4bc5f0 233
nexpaq 0:6c56fb4bc5f0 234 if( s2 == NULL || s2 <= s1 )
nexpaq 0:6c56fb4bc5f0 235 return( MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT );
nexpaq 0:6c56fb4bc5f0 236
nexpaq 0:6c56fb4bc5f0 237 s1 += strlen( header );
nexpaq 0:6c56fb4bc5f0 238 if( *s1 == ' ' ) s1++;
nexpaq 0:6c56fb4bc5f0 239 if( *s1 == '\r' ) s1++;
nexpaq 0:6c56fb4bc5f0 240 if( *s1 == '\n' ) s1++;
nexpaq 0:6c56fb4bc5f0 241 else return( MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT );
nexpaq 0:6c56fb4bc5f0 242
nexpaq 0:6c56fb4bc5f0 243 end = s2;
nexpaq 0:6c56fb4bc5f0 244 end += strlen( footer );
nexpaq 0:6c56fb4bc5f0 245 if( *end == ' ' ) end++;
nexpaq 0:6c56fb4bc5f0 246 if( *end == '\r' ) end++;
nexpaq 0:6c56fb4bc5f0 247 if( *end == '\n' ) end++;
nexpaq 0:6c56fb4bc5f0 248 *use_len = end - data;
nexpaq 0:6c56fb4bc5f0 249
nexpaq 0:6c56fb4bc5f0 250 enc = 0;
nexpaq 0:6c56fb4bc5f0 251
nexpaq 0:6c56fb4bc5f0 252 if( memcmp( s1, "Proc-Type: 4,ENCRYPTED", 22 ) == 0 )
nexpaq 0:6c56fb4bc5f0 253 {
nexpaq 0:6c56fb4bc5f0 254 #if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
nexpaq 0:6c56fb4bc5f0 255 ( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
nexpaq 0:6c56fb4bc5f0 256 enc++;
nexpaq 0:6c56fb4bc5f0 257
nexpaq 0:6c56fb4bc5f0 258 s1 += 22;
nexpaq 0:6c56fb4bc5f0 259 if( *s1 == '\r' ) s1++;
nexpaq 0:6c56fb4bc5f0 260 if( *s1 == '\n' ) s1++;
nexpaq 0:6c56fb4bc5f0 261 else return( MBEDTLS_ERR_PEM_INVALID_DATA );
nexpaq 0:6c56fb4bc5f0 262
nexpaq 0:6c56fb4bc5f0 263
nexpaq 0:6c56fb4bc5f0 264 #if defined(MBEDTLS_DES_C)
nexpaq 0:6c56fb4bc5f0 265 if( memcmp( s1, "DEK-Info: DES-EDE3-CBC,", 23 ) == 0 )
nexpaq 0:6c56fb4bc5f0 266 {
nexpaq 0:6c56fb4bc5f0 267 enc_alg = MBEDTLS_CIPHER_DES_EDE3_CBC;
nexpaq 0:6c56fb4bc5f0 268
nexpaq 0:6c56fb4bc5f0 269 s1 += 23;
nexpaq 0:6c56fb4bc5f0 270 if( pem_get_iv( s1, pem_iv, 8 ) != 0 )
nexpaq 0:6c56fb4bc5f0 271 return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
nexpaq 0:6c56fb4bc5f0 272
nexpaq 0:6c56fb4bc5f0 273 s1 += 16;
nexpaq 0:6c56fb4bc5f0 274 }
nexpaq 0:6c56fb4bc5f0 275 else if( memcmp( s1, "DEK-Info: DES-CBC,", 18 ) == 0 )
nexpaq 0:6c56fb4bc5f0 276 {
nexpaq 0:6c56fb4bc5f0 277 enc_alg = MBEDTLS_CIPHER_DES_CBC;
nexpaq 0:6c56fb4bc5f0 278
nexpaq 0:6c56fb4bc5f0 279 s1 += 18;
nexpaq 0:6c56fb4bc5f0 280 if( pem_get_iv( s1, pem_iv, 8) != 0 )
nexpaq 0:6c56fb4bc5f0 281 return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
nexpaq 0:6c56fb4bc5f0 282
nexpaq 0:6c56fb4bc5f0 283 s1 += 16;
nexpaq 0:6c56fb4bc5f0 284 }
nexpaq 0:6c56fb4bc5f0 285 #endif /* MBEDTLS_DES_C */
nexpaq 0:6c56fb4bc5f0 286
nexpaq 0:6c56fb4bc5f0 287 #if defined(MBEDTLS_AES_C)
nexpaq 0:6c56fb4bc5f0 288 if( memcmp( s1, "DEK-Info: AES-", 14 ) == 0 )
nexpaq 0:6c56fb4bc5f0 289 {
nexpaq 0:6c56fb4bc5f0 290 if( memcmp( s1, "DEK-Info: AES-128-CBC,", 22 ) == 0 )
nexpaq 0:6c56fb4bc5f0 291 enc_alg = MBEDTLS_CIPHER_AES_128_CBC;
nexpaq 0:6c56fb4bc5f0 292 else if( memcmp( s1, "DEK-Info: AES-192-CBC,", 22 ) == 0 )
nexpaq 0:6c56fb4bc5f0 293 enc_alg = MBEDTLS_CIPHER_AES_192_CBC;
nexpaq 0:6c56fb4bc5f0 294 else if( memcmp( s1, "DEK-Info: AES-256-CBC,", 22 ) == 0 )
nexpaq 0:6c56fb4bc5f0 295 enc_alg = MBEDTLS_CIPHER_AES_256_CBC;
nexpaq 0:6c56fb4bc5f0 296 else
nexpaq 0:6c56fb4bc5f0 297 return( MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG );
nexpaq 0:6c56fb4bc5f0 298
nexpaq 0:6c56fb4bc5f0 299 s1 += 22;
nexpaq 0:6c56fb4bc5f0 300 if( pem_get_iv( s1, pem_iv, 16 ) != 0 )
nexpaq 0:6c56fb4bc5f0 301 return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
nexpaq 0:6c56fb4bc5f0 302
nexpaq 0:6c56fb4bc5f0 303 s1 += 32;
nexpaq 0:6c56fb4bc5f0 304 }
nexpaq 0:6c56fb4bc5f0 305 #endif /* MBEDTLS_AES_C */
nexpaq 0:6c56fb4bc5f0 306
nexpaq 0:6c56fb4bc5f0 307 if( enc_alg == MBEDTLS_CIPHER_NONE )
nexpaq 0:6c56fb4bc5f0 308 return( MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG );
nexpaq 0:6c56fb4bc5f0 309
nexpaq 0:6c56fb4bc5f0 310 if( *s1 == '\r' ) s1++;
nexpaq 0:6c56fb4bc5f0 311 if( *s1 == '\n' ) s1++;
nexpaq 0:6c56fb4bc5f0 312 else return( MBEDTLS_ERR_PEM_INVALID_DATA );
nexpaq 0:6c56fb4bc5f0 313 #else
nexpaq 0:6c56fb4bc5f0 314 return( MBEDTLS_ERR_PEM_FEATURE_UNAVAILABLE );
nexpaq 0:6c56fb4bc5f0 315 #endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
nexpaq 0:6c56fb4bc5f0 316 ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
nexpaq 0:6c56fb4bc5f0 317 }
nexpaq 0:6c56fb4bc5f0 318
nexpaq 0:6c56fb4bc5f0 319 if( s1 == s2 )
nexpaq 0:6c56fb4bc5f0 320 return( MBEDTLS_ERR_PEM_INVALID_DATA );
nexpaq 0:6c56fb4bc5f0 321
nexpaq 0:6c56fb4bc5f0 322 ret = mbedtls_base64_decode( NULL, 0, &len, s1, s2 - s1 );
nexpaq 0:6c56fb4bc5f0 323
nexpaq 0:6c56fb4bc5f0 324 if( ret == MBEDTLS_ERR_BASE64_INVALID_CHARACTER )
nexpaq 0:6c56fb4bc5f0 325 return( MBEDTLS_ERR_PEM_INVALID_DATA + ret );
nexpaq 0:6c56fb4bc5f0 326
nexpaq 0:6c56fb4bc5f0 327 if( ( buf = mbedtls_calloc( 1, len ) ) == NULL )
nexpaq 0:6c56fb4bc5f0 328 return( MBEDTLS_ERR_PEM_ALLOC_FAILED );
nexpaq 0:6c56fb4bc5f0 329
nexpaq 0:6c56fb4bc5f0 330 if( ( ret = mbedtls_base64_decode( buf, len, &len, s1, s2 - s1 ) ) != 0 )
nexpaq 0:6c56fb4bc5f0 331 {
nexpaq 0:6c56fb4bc5f0 332 mbedtls_free( buf );
nexpaq 0:6c56fb4bc5f0 333 return( MBEDTLS_ERR_PEM_INVALID_DATA + ret );
nexpaq 0:6c56fb4bc5f0 334 }
nexpaq 0:6c56fb4bc5f0 335
nexpaq 0:6c56fb4bc5f0 336 if( enc != 0 )
nexpaq 0:6c56fb4bc5f0 337 {
nexpaq 0:6c56fb4bc5f0 338 #if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
nexpaq 0:6c56fb4bc5f0 339 ( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
nexpaq 0:6c56fb4bc5f0 340 if( pwd == NULL )
nexpaq 0:6c56fb4bc5f0 341 {
nexpaq 0:6c56fb4bc5f0 342 mbedtls_free( buf );
nexpaq 0:6c56fb4bc5f0 343 return( MBEDTLS_ERR_PEM_PASSWORD_REQUIRED );
nexpaq 0:6c56fb4bc5f0 344 }
nexpaq 0:6c56fb4bc5f0 345
nexpaq 0:6c56fb4bc5f0 346 #if defined(MBEDTLS_DES_C)
nexpaq 0:6c56fb4bc5f0 347 if( enc_alg == MBEDTLS_CIPHER_DES_EDE3_CBC )
nexpaq 0:6c56fb4bc5f0 348 pem_des3_decrypt( pem_iv, buf, len, pwd, pwdlen );
nexpaq 0:6c56fb4bc5f0 349 else if( enc_alg == MBEDTLS_CIPHER_DES_CBC )
nexpaq 0:6c56fb4bc5f0 350 pem_des_decrypt( pem_iv, buf, len, pwd, pwdlen );
nexpaq 0:6c56fb4bc5f0 351 #endif /* MBEDTLS_DES_C */
nexpaq 0:6c56fb4bc5f0 352
nexpaq 0:6c56fb4bc5f0 353 #if defined(MBEDTLS_AES_C)
nexpaq 0:6c56fb4bc5f0 354 if( enc_alg == MBEDTLS_CIPHER_AES_128_CBC )
nexpaq 0:6c56fb4bc5f0 355 pem_aes_decrypt( pem_iv, 16, buf, len, pwd, pwdlen );
nexpaq 0:6c56fb4bc5f0 356 else if( enc_alg == MBEDTLS_CIPHER_AES_192_CBC )
nexpaq 0:6c56fb4bc5f0 357 pem_aes_decrypt( pem_iv, 24, buf, len, pwd, pwdlen );
nexpaq 0:6c56fb4bc5f0 358 else if( enc_alg == MBEDTLS_CIPHER_AES_256_CBC )
nexpaq 0:6c56fb4bc5f0 359 pem_aes_decrypt( pem_iv, 32, buf, len, pwd, pwdlen );
nexpaq 0:6c56fb4bc5f0 360 #endif /* MBEDTLS_AES_C */
nexpaq 0:6c56fb4bc5f0 361
nexpaq 0:6c56fb4bc5f0 362 /*
nexpaq 0:6c56fb4bc5f0 363 * The result will be ASN.1 starting with a SEQUENCE tag, with 1 to 3
nexpaq 0:6c56fb4bc5f0 364 * length bytes (allow 4 to be sure) in all known use cases.
nexpaq 0:6c56fb4bc5f0 365 *
nexpaq 0:6c56fb4bc5f0 366 * Use that as heurisitic to try detecting password mismatchs.
nexpaq 0:6c56fb4bc5f0 367 */
nexpaq 0:6c56fb4bc5f0 368 if( len <= 2 || buf[0] != 0x30 || buf[1] > 0x83 )
nexpaq 0:6c56fb4bc5f0 369 {
nexpaq 0:6c56fb4bc5f0 370 mbedtls_free( buf );
nexpaq 0:6c56fb4bc5f0 371 return( MBEDTLS_ERR_PEM_PASSWORD_MISMATCH );
nexpaq 0:6c56fb4bc5f0 372 }
nexpaq 0:6c56fb4bc5f0 373 #else
nexpaq 0:6c56fb4bc5f0 374 mbedtls_free( buf );
nexpaq 0:6c56fb4bc5f0 375 return( MBEDTLS_ERR_PEM_FEATURE_UNAVAILABLE );
nexpaq 0:6c56fb4bc5f0 376 #endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
nexpaq 0:6c56fb4bc5f0 377 ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
nexpaq 0:6c56fb4bc5f0 378 }
nexpaq 0:6c56fb4bc5f0 379
nexpaq 0:6c56fb4bc5f0 380 ctx->buf = buf;
nexpaq 0:6c56fb4bc5f0 381 ctx->buflen = len;
nexpaq 0:6c56fb4bc5f0 382
nexpaq 0:6c56fb4bc5f0 383 return( 0 );
nexpaq 0:6c56fb4bc5f0 384 }
nexpaq 0:6c56fb4bc5f0 385
nexpaq 0:6c56fb4bc5f0 386 void mbedtls_pem_free( mbedtls_pem_context *ctx )
nexpaq 0:6c56fb4bc5f0 387 {
nexpaq 0:6c56fb4bc5f0 388 mbedtls_free( ctx->buf );
nexpaq 0:6c56fb4bc5f0 389 mbedtls_free( ctx->info );
nexpaq 0:6c56fb4bc5f0 390
nexpaq 0:6c56fb4bc5f0 391 mbedtls_zeroize( ctx, sizeof( mbedtls_pem_context ) );
nexpaq 0:6c56fb4bc5f0 392 }
nexpaq 0:6c56fb4bc5f0 393 #endif /* MBEDTLS_PEM_PARSE_C */
nexpaq 0:6c56fb4bc5f0 394
nexpaq 0:6c56fb4bc5f0 395 #if defined(MBEDTLS_PEM_WRITE_C)
nexpaq 0:6c56fb4bc5f0 396 int mbedtls_pem_write_buffer( const char *header, const char *footer,
nexpaq 0:6c56fb4bc5f0 397 const unsigned char *der_data, size_t der_len,
nexpaq 0:6c56fb4bc5f0 398 unsigned char *buf, size_t buf_len, size_t *olen )
nexpaq 0:6c56fb4bc5f0 399 {
nexpaq 0:6c56fb4bc5f0 400 int ret;
nexpaq 0:6c56fb4bc5f0 401 unsigned char *encode_buf, *c, *p = buf;
nexpaq 0:6c56fb4bc5f0 402 size_t len = 0, use_len, add_len = 0;
nexpaq 0:6c56fb4bc5f0 403
nexpaq 0:6c56fb4bc5f0 404 mbedtls_base64_encode( NULL, 0, &use_len, der_data, der_len );
nexpaq 0:6c56fb4bc5f0 405 add_len = strlen( header ) + strlen( footer ) + ( use_len / 64 ) + 1;
nexpaq 0:6c56fb4bc5f0 406
nexpaq 0:6c56fb4bc5f0 407 if( use_len + add_len > buf_len )
nexpaq 0:6c56fb4bc5f0 408 {
nexpaq 0:6c56fb4bc5f0 409 *olen = use_len + add_len;
nexpaq 0:6c56fb4bc5f0 410 return( MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL );
nexpaq 0:6c56fb4bc5f0 411 }
nexpaq 0:6c56fb4bc5f0 412
nexpaq 0:6c56fb4bc5f0 413 if( ( encode_buf = mbedtls_calloc( 1, use_len ) ) == NULL )
nexpaq 0:6c56fb4bc5f0 414 return( MBEDTLS_ERR_PEM_ALLOC_FAILED );
nexpaq 0:6c56fb4bc5f0 415
nexpaq 0:6c56fb4bc5f0 416 if( ( ret = mbedtls_base64_encode( encode_buf, use_len, &use_len, der_data,
nexpaq 0:6c56fb4bc5f0 417 der_len ) ) != 0 )
nexpaq 0:6c56fb4bc5f0 418 {
nexpaq 0:6c56fb4bc5f0 419 mbedtls_free( encode_buf );
nexpaq 0:6c56fb4bc5f0 420 return( ret );
nexpaq 0:6c56fb4bc5f0 421 }
nexpaq 0:6c56fb4bc5f0 422
nexpaq 0:6c56fb4bc5f0 423 memcpy( p, header, strlen( header ) );
nexpaq 0:6c56fb4bc5f0 424 p += strlen( header );
nexpaq 0:6c56fb4bc5f0 425 c = encode_buf;
nexpaq 0:6c56fb4bc5f0 426
nexpaq 0:6c56fb4bc5f0 427 while( use_len )
nexpaq 0:6c56fb4bc5f0 428 {
nexpaq 0:6c56fb4bc5f0 429 len = ( use_len > 64 ) ? 64 : use_len;
nexpaq 0:6c56fb4bc5f0 430 memcpy( p, c, len );
nexpaq 0:6c56fb4bc5f0 431 use_len -= len;
nexpaq 0:6c56fb4bc5f0 432 p += len;
nexpaq 0:6c56fb4bc5f0 433 c += len;
nexpaq 0:6c56fb4bc5f0 434 *p++ = '\n';
nexpaq 0:6c56fb4bc5f0 435 }
nexpaq 0:6c56fb4bc5f0 436
nexpaq 0:6c56fb4bc5f0 437 memcpy( p, footer, strlen( footer ) );
nexpaq 0:6c56fb4bc5f0 438 p += strlen( footer );
nexpaq 0:6c56fb4bc5f0 439
nexpaq 0:6c56fb4bc5f0 440 *p++ = '\0';
nexpaq 0:6c56fb4bc5f0 441 *olen = p - buf;
nexpaq 0:6c56fb4bc5f0 442
nexpaq 0:6c56fb4bc5f0 443 mbedtls_free( encode_buf );
nexpaq 0:6c56fb4bc5f0 444 return( 0 );
nexpaq 0:6c56fb4bc5f0 445 }
nexpaq 0:6c56fb4bc5f0 446 #endif /* MBEDTLS_PEM_WRITE_C */
nexpaq 0:6c56fb4bc5f0 447 #endif /* MBEDTLS_PEM_PARSE_C || MBEDTLS_PEM_WRITE_C */