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mbed-os

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

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

Who changed what in which revision?

UserRevisionLine numberNew contents of line
be_bryan 0:b74591d5ab33 1 /*
be_bryan 0:b74591d5ab33 2 * Privacy Enhanced Mail (PEM) decoding
be_bryan 0:b74591d5ab33 3 *
be_bryan 0:b74591d5ab33 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
be_bryan 0:b74591d5ab33 5 * SPDX-License-Identifier: Apache-2.0
be_bryan 0:b74591d5ab33 6 *
be_bryan 0:b74591d5ab33 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
be_bryan 0:b74591d5ab33 8 * not use this file except in compliance with the License.
be_bryan 0:b74591d5ab33 9 * You may obtain a copy of the License at
be_bryan 0:b74591d5ab33 10 *
be_bryan 0:b74591d5ab33 11 * http://www.apache.org/licenses/LICENSE-2.0
be_bryan 0:b74591d5ab33 12 *
be_bryan 0:b74591d5ab33 13 * Unless required by applicable law or agreed to in writing, software
be_bryan 0:b74591d5ab33 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
be_bryan 0:b74591d5ab33 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
be_bryan 0:b74591d5ab33 16 * See the License for the specific language governing permissions and
be_bryan 0:b74591d5ab33 17 * limitations under the License.
be_bryan 0:b74591d5ab33 18 *
be_bryan 0:b74591d5ab33 19 * This file is part of mbed TLS (https://tls.mbed.org)
be_bryan 0:b74591d5ab33 20 */
be_bryan 0:b74591d5ab33 21
be_bryan 0:b74591d5ab33 22 #if !defined(MBEDTLS_CONFIG_FILE)
be_bryan 0:b74591d5ab33 23 #include "mbedtls/config.h"
be_bryan 0:b74591d5ab33 24 #else
be_bryan 0:b74591d5ab33 25 #include MBEDTLS_CONFIG_FILE
be_bryan 0:b74591d5ab33 26 #endif
be_bryan 0:b74591d5ab33 27
be_bryan 0:b74591d5ab33 28 #if defined(MBEDTLS_PEM_PARSE_C) || defined(MBEDTLS_PEM_WRITE_C)
be_bryan 0:b74591d5ab33 29
be_bryan 0:b74591d5ab33 30 #include "mbedtls/pem.h"
be_bryan 0:b74591d5ab33 31 #include "mbedtls/base64.h"
be_bryan 0:b74591d5ab33 32 #include "mbedtls/des.h"
be_bryan 0:b74591d5ab33 33 #include "mbedtls/aes.h"
be_bryan 0:b74591d5ab33 34 #include "mbedtls/md5.h"
be_bryan 0:b74591d5ab33 35 #include "mbedtls/cipher.h"
be_bryan 0:b74591d5ab33 36
be_bryan 0:b74591d5ab33 37 #include <string.h>
be_bryan 0:b74591d5ab33 38
be_bryan 0:b74591d5ab33 39 #if defined(MBEDTLS_PLATFORM_C)
be_bryan 0:b74591d5ab33 40 #include "mbedtls/platform.h"
be_bryan 0:b74591d5ab33 41 #else
be_bryan 0:b74591d5ab33 42 #include <stdlib.h>
be_bryan 0:b74591d5ab33 43 #define mbedtls_calloc calloc
be_bryan 0:b74591d5ab33 44 #define mbedtls_free free
be_bryan 0:b74591d5ab33 45 #endif
be_bryan 0:b74591d5ab33 46
be_bryan 0:b74591d5ab33 47 #if defined(MBEDTLS_PEM_PARSE_C)
be_bryan 0:b74591d5ab33 48 /* Implementation that should never be optimized out by the compiler */
be_bryan 0:b74591d5ab33 49 static void mbedtls_zeroize( void *v, size_t n ) {
be_bryan 0:b74591d5ab33 50 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
be_bryan 0:b74591d5ab33 51 }
be_bryan 0:b74591d5ab33 52
be_bryan 0:b74591d5ab33 53 void mbedtls_pem_init( mbedtls_pem_context *ctx )
be_bryan 0:b74591d5ab33 54 {
be_bryan 0:b74591d5ab33 55 memset( ctx, 0, sizeof( mbedtls_pem_context ) );
be_bryan 0:b74591d5ab33 56 }
be_bryan 0:b74591d5ab33 57
be_bryan 0:b74591d5ab33 58 #if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
be_bryan 0:b74591d5ab33 59 ( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
be_bryan 0:b74591d5ab33 60 /*
be_bryan 0:b74591d5ab33 61 * Read a 16-byte hex string and convert it to binary
be_bryan 0:b74591d5ab33 62 */
be_bryan 0:b74591d5ab33 63 static int pem_get_iv( const unsigned char *s, unsigned char *iv,
be_bryan 0:b74591d5ab33 64 size_t iv_len )
be_bryan 0:b74591d5ab33 65 {
be_bryan 0:b74591d5ab33 66 size_t i, j, k;
be_bryan 0:b74591d5ab33 67
be_bryan 0:b74591d5ab33 68 memset( iv, 0, iv_len );
be_bryan 0:b74591d5ab33 69
be_bryan 0:b74591d5ab33 70 for( i = 0; i < iv_len * 2; i++, s++ )
be_bryan 0:b74591d5ab33 71 {
be_bryan 0:b74591d5ab33 72 if( *s >= '0' && *s <= '9' ) j = *s - '0'; else
be_bryan 0:b74591d5ab33 73 if( *s >= 'A' && *s <= 'F' ) j = *s - '7'; else
be_bryan 0:b74591d5ab33 74 if( *s >= 'a' && *s <= 'f' ) j = *s - 'W'; else
be_bryan 0:b74591d5ab33 75 return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
be_bryan 0:b74591d5ab33 76
be_bryan 0:b74591d5ab33 77 k = ( ( i & 1 ) != 0 ) ? j : j << 4;
be_bryan 0:b74591d5ab33 78
be_bryan 0:b74591d5ab33 79 iv[i >> 1] = (unsigned char)( iv[i >> 1] | k );
be_bryan 0:b74591d5ab33 80 }
be_bryan 0:b74591d5ab33 81
be_bryan 0:b74591d5ab33 82 return( 0 );
be_bryan 0:b74591d5ab33 83 }
be_bryan 0:b74591d5ab33 84
be_bryan 0:b74591d5ab33 85 static void pem_pbkdf1( unsigned char *key, size_t keylen,
be_bryan 0:b74591d5ab33 86 unsigned char *iv,
be_bryan 0:b74591d5ab33 87 const unsigned char *pwd, size_t pwdlen )
be_bryan 0:b74591d5ab33 88 {
be_bryan 0:b74591d5ab33 89 mbedtls_md5_context md5_ctx;
be_bryan 0:b74591d5ab33 90 unsigned char md5sum[16];
be_bryan 0:b74591d5ab33 91 size_t use_len;
be_bryan 0:b74591d5ab33 92
be_bryan 0:b74591d5ab33 93 mbedtls_md5_init( &md5_ctx );
be_bryan 0:b74591d5ab33 94
be_bryan 0:b74591d5ab33 95 /*
be_bryan 0:b74591d5ab33 96 * key[ 0..15] = MD5(pwd || IV)
be_bryan 0:b74591d5ab33 97 */
be_bryan 0:b74591d5ab33 98 mbedtls_md5_starts( &md5_ctx );
be_bryan 0:b74591d5ab33 99 mbedtls_md5_update( &md5_ctx, pwd, pwdlen );
be_bryan 0:b74591d5ab33 100 mbedtls_md5_update( &md5_ctx, iv, 8 );
be_bryan 0:b74591d5ab33 101 mbedtls_md5_finish( &md5_ctx, md5sum );
be_bryan 0:b74591d5ab33 102
be_bryan 0:b74591d5ab33 103 if( keylen <= 16 )
be_bryan 0:b74591d5ab33 104 {
be_bryan 0:b74591d5ab33 105 memcpy( key, md5sum, keylen );
be_bryan 0:b74591d5ab33 106
be_bryan 0:b74591d5ab33 107 mbedtls_md5_free( &md5_ctx );
be_bryan 0:b74591d5ab33 108 mbedtls_zeroize( md5sum, 16 );
be_bryan 0:b74591d5ab33 109 return;
be_bryan 0:b74591d5ab33 110 }
be_bryan 0:b74591d5ab33 111
be_bryan 0:b74591d5ab33 112 memcpy( key, md5sum, 16 );
be_bryan 0:b74591d5ab33 113
be_bryan 0:b74591d5ab33 114 /*
be_bryan 0:b74591d5ab33 115 * key[16..23] = MD5(key[ 0..15] || pwd || IV])
be_bryan 0:b74591d5ab33 116 */
be_bryan 0:b74591d5ab33 117 mbedtls_md5_starts( &md5_ctx );
be_bryan 0:b74591d5ab33 118 mbedtls_md5_update( &md5_ctx, md5sum, 16 );
be_bryan 0:b74591d5ab33 119 mbedtls_md5_update( &md5_ctx, pwd, pwdlen );
be_bryan 0:b74591d5ab33 120 mbedtls_md5_update( &md5_ctx, iv, 8 );
be_bryan 0:b74591d5ab33 121 mbedtls_md5_finish( &md5_ctx, md5sum );
be_bryan 0:b74591d5ab33 122
be_bryan 0:b74591d5ab33 123 use_len = 16;
be_bryan 0:b74591d5ab33 124 if( keylen < 32 )
be_bryan 0:b74591d5ab33 125 use_len = keylen - 16;
be_bryan 0:b74591d5ab33 126
be_bryan 0:b74591d5ab33 127 memcpy( key + 16, md5sum, use_len );
be_bryan 0:b74591d5ab33 128
be_bryan 0:b74591d5ab33 129 mbedtls_md5_free( &md5_ctx );
be_bryan 0:b74591d5ab33 130 mbedtls_zeroize( md5sum, 16 );
be_bryan 0:b74591d5ab33 131 }
be_bryan 0:b74591d5ab33 132
be_bryan 0:b74591d5ab33 133 #if defined(MBEDTLS_DES_C)
be_bryan 0:b74591d5ab33 134 /*
be_bryan 0:b74591d5ab33 135 * Decrypt with DES-CBC, using PBKDF1 for key derivation
be_bryan 0:b74591d5ab33 136 */
be_bryan 0:b74591d5ab33 137 static void pem_des_decrypt( unsigned char des_iv[8],
be_bryan 0:b74591d5ab33 138 unsigned char *buf, size_t buflen,
be_bryan 0:b74591d5ab33 139 const unsigned char *pwd, size_t pwdlen )
be_bryan 0:b74591d5ab33 140 {
be_bryan 0:b74591d5ab33 141 mbedtls_des_context des_ctx;
be_bryan 0:b74591d5ab33 142 unsigned char des_key[8];
be_bryan 0:b74591d5ab33 143
be_bryan 0:b74591d5ab33 144 mbedtls_des_init( &des_ctx );
be_bryan 0:b74591d5ab33 145
be_bryan 0:b74591d5ab33 146 pem_pbkdf1( des_key, 8, des_iv, pwd, pwdlen );
be_bryan 0:b74591d5ab33 147
be_bryan 0:b74591d5ab33 148 mbedtls_des_setkey_dec( &des_ctx, des_key );
be_bryan 0:b74591d5ab33 149 mbedtls_des_crypt_cbc( &des_ctx, MBEDTLS_DES_DECRYPT, buflen,
be_bryan 0:b74591d5ab33 150 des_iv, buf, buf );
be_bryan 0:b74591d5ab33 151
be_bryan 0:b74591d5ab33 152 mbedtls_des_free( &des_ctx );
be_bryan 0:b74591d5ab33 153 mbedtls_zeroize( des_key, 8 );
be_bryan 0:b74591d5ab33 154 }
be_bryan 0:b74591d5ab33 155
be_bryan 0:b74591d5ab33 156 /*
be_bryan 0:b74591d5ab33 157 * Decrypt with 3DES-CBC, using PBKDF1 for key derivation
be_bryan 0:b74591d5ab33 158 */
be_bryan 0:b74591d5ab33 159 static void pem_des3_decrypt( unsigned char des3_iv[8],
be_bryan 0:b74591d5ab33 160 unsigned char *buf, size_t buflen,
be_bryan 0:b74591d5ab33 161 const unsigned char *pwd, size_t pwdlen )
be_bryan 0:b74591d5ab33 162 {
be_bryan 0:b74591d5ab33 163 mbedtls_des3_context des3_ctx;
be_bryan 0:b74591d5ab33 164 unsigned char des3_key[24];
be_bryan 0:b74591d5ab33 165
be_bryan 0:b74591d5ab33 166 mbedtls_des3_init( &des3_ctx );
be_bryan 0:b74591d5ab33 167
be_bryan 0:b74591d5ab33 168 pem_pbkdf1( des3_key, 24, des3_iv, pwd, pwdlen );
be_bryan 0:b74591d5ab33 169
be_bryan 0:b74591d5ab33 170 mbedtls_des3_set3key_dec( &des3_ctx, des3_key );
be_bryan 0:b74591d5ab33 171 mbedtls_des3_crypt_cbc( &des3_ctx, MBEDTLS_DES_DECRYPT, buflen,
be_bryan 0:b74591d5ab33 172 des3_iv, buf, buf );
be_bryan 0:b74591d5ab33 173
be_bryan 0:b74591d5ab33 174 mbedtls_des3_free( &des3_ctx );
be_bryan 0:b74591d5ab33 175 mbedtls_zeroize( des3_key, 24 );
be_bryan 0:b74591d5ab33 176 }
be_bryan 0:b74591d5ab33 177 #endif /* MBEDTLS_DES_C */
be_bryan 0:b74591d5ab33 178
be_bryan 0:b74591d5ab33 179 #if defined(MBEDTLS_AES_C)
be_bryan 0:b74591d5ab33 180 /*
be_bryan 0:b74591d5ab33 181 * Decrypt with AES-XXX-CBC, using PBKDF1 for key derivation
be_bryan 0:b74591d5ab33 182 */
be_bryan 0:b74591d5ab33 183 static void pem_aes_decrypt( unsigned char aes_iv[16], unsigned int keylen,
be_bryan 0:b74591d5ab33 184 unsigned char *buf, size_t buflen,
be_bryan 0:b74591d5ab33 185 const unsigned char *pwd, size_t pwdlen )
be_bryan 0:b74591d5ab33 186 {
be_bryan 0:b74591d5ab33 187 mbedtls_aes_context aes_ctx;
be_bryan 0:b74591d5ab33 188 unsigned char aes_key[32];
be_bryan 0:b74591d5ab33 189
be_bryan 0:b74591d5ab33 190 mbedtls_aes_init( &aes_ctx );
be_bryan 0:b74591d5ab33 191
be_bryan 0:b74591d5ab33 192 pem_pbkdf1( aes_key, keylen, aes_iv, pwd, pwdlen );
be_bryan 0:b74591d5ab33 193
be_bryan 0:b74591d5ab33 194 mbedtls_aes_setkey_dec( &aes_ctx, aes_key, keylen * 8 );
be_bryan 0:b74591d5ab33 195 mbedtls_aes_crypt_cbc( &aes_ctx, MBEDTLS_AES_DECRYPT, buflen,
be_bryan 0:b74591d5ab33 196 aes_iv, buf, buf );
be_bryan 0:b74591d5ab33 197
be_bryan 0:b74591d5ab33 198 mbedtls_aes_free( &aes_ctx );
be_bryan 0:b74591d5ab33 199 mbedtls_zeroize( aes_key, keylen );
be_bryan 0:b74591d5ab33 200 }
be_bryan 0:b74591d5ab33 201 #endif /* MBEDTLS_AES_C */
be_bryan 0:b74591d5ab33 202
be_bryan 0:b74591d5ab33 203 #endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
be_bryan 0:b74591d5ab33 204 ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
be_bryan 0:b74591d5ab33 205
be_bryan 0:b74591d5ab33 206 int mbedtls_pem_read_buffer( mbedtls_pem_context *ctx, const char *header, const char *footer,
be_bryan 0:b74591d5ab33 207 const unsigned char *data, const unsigned char *pwd,
be_bryan 0:b74591d5ab33 208 size_t pwdlen, size_t *use_len )
be_bryan 0:b74591d5ab33 209 {
be_bryan 0:b74591d5ab33 210 int ret, enc;
be_bryan 0:b74591d5ab33 211 size_t len;
be_bryan 0:b74591d5ab33 212 unsigned char *buf;
be_bryan 0:b74591d5ab33 213 const unsigned char *s1, *s2, *end;
be_bryan 0:b74591d5ab33 214 #if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
be_bryan 0:b74591d5ab33 215 ( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
be_bryan 0:b74591d5ab33 216 unsigned char pem_iv[16];
be_bryan 0:b74591d5ab33 217 mbedtls_cipher_type_t enc_alg = MBEDTLS_CIPHER_NONE;
be_bryan 0:b74591d5ab33 218 #else
be_bryan 0:b74591d5ab33 219 ((void) pwd);
be_bryan 0:b74591d5ab33 220 ((void) pwdlen);
be_bryan 0:b74591d5ab33 221 #endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
be_bryan 0:b74591d5ab33 222 ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
be_bryan 0:b74591d5ab33 223
be_bryan 0:b74591d5ab33 224 if( ctx == NULL )
be_bryan 0:b74591d5ab33 225 return( MBEDTLS_ERR_PEM_BAD_INPUT_DATA );
be_bryan 0:b74591d5ab33 226
be_bryan 0:b74591d5ab33 227 s1 = (unsigned char *) strstr( (const char *) data, header );
be_bryan 0:b74591d5ab33 228
be_bryan 0:b74591d5ab33 229 if( s1 == NULL )
be_bryan 0:b74591d5ab33 230 return( MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT );
be_bryan 0:b74591d5ab33 231
be_bryan 0:b74591d5ab33 232 s2 = (unsigned char *) strstr( (const char *) data, footer );
be_bryan 0:b74591d5ab33 233
be_bryan 0:b74591d5ab33 234 if( s2 == NULL || s2 <= s1 )
be_bryan 0:b74591d5ab33 235 return( MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT );
be_bryan 0:b74591d5ab33 236
be_bryan 0:b74591d5ab33 237 s1 += strlen( header );
be_bryan 0:b74591d5ab33 238 if( *s1 == ' ' ) s1++;
be_bryan 0:b74591d5ab33 239 if( *s1 == '\r' ) s1++;
be_bryan 0:b74591d5ab33 240 if( *s1 == '\n' ) s1++;
be_bryan 0:b74591d5ab33 241 else return( MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT );
be_bryan 0:b74591d5ab33 242
be_bryan 0:b74591d5ab33 243 end = s2;
be_bryan 0:b74591d5ab33 244 end += strlen( footer );
be_bryan 0:b74591d5ab33 245 if( *end == ' ' ) end++;
be_bryan 0:b74591d5ab33 246 if( *end == '\r' ) end++;
be_bryan 0:b74591d5ab33 247 if( *end == '\n' ) end++;
be_bryan 0:b74591d5ab33 248 *use_len = end - data;
be_bryan 0:b74591d5ab33 249
be_bryan 0:b74591d5ab33 250 enc = 0;
be_bryan 0:b74591d5ab33 251
be_bryan 0:b74591d5ab33 252 if( s2 - s1 >= 22 && memcmp( s1, "Proc-Type: 4,ENCRYPTED", 22 ) == 0 )
be_bryan 0:b74591d5ab33 253 {
be_bryan 0:b74591d5ab33 254 #if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
be_bryan 0:b74591d5ab33 255 ( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
be_bryan 0:b74591d5ab33 256 enc++;
be_bryan 0:b74591d5ab33 257
be_bryan 0:b74591d5ab33 258 s1 += 22;
be_bryan 0:b74591d5ab33 259 if( *s1 == '\r' ) s1++;
be_bryan 0:b74591d5ab33 260 if( *s1 == '\n' ) s1++;
be_bryan 0:b74591d5ab33 261 else return( MBEDTLS_ERR_PEM_INVALID_DATA );
be_bryan 0:b74591d5ab33 262
be_bryan 0:b74591d5ab33 263
be_bryan 0:b74591d5ab33 264 #if defined(MBEDTLS_DES_C)
be_bryan 0:b74591d5ab33 265 if( s2 - s1 >= 23 && memcmp( s1, "DEK-Info: DES-EDE3-CBC,", 23 ) == 0 )
be_bryan 0:b74591d5ab33 266 {
be_bryan 0:b74591d5ab33 267 enc_alg = MBEDTLS_CIPHER_DES_EDE3_CBC;
be_bryan 0:b74591d5ab33 268
be_bryan 0:b74591d5ab33 269 s1 += 23;
be_bryan 0:b74591d5ab33 270 if( s2 - s1 < 16 || pem_get_iv( s1, pem_iv, 8 ) != 0 )
be_bryan 0:b74591d5ab33 271 return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
be_bryan 0:b74591d5ab33 272
be_bryan 0:b74591d5ab33 273 s1 += 16;
be_bryan 0:b74591d5ab33 274 }
be_bryan 0:b74591d5ab33 275 else if( s2 - s1 >= 18 && memcmp( s1, "DEK-Info: DES-CBC,", 18 ) == 0 )
be_bryan 0:b74591d5ab33 276 {
be_bryan 0:b74591d5ab33 277 enc_alg = MBEDTLS_CIPHER_DES_CBC;
be_bryan 0:b74591d5ab33 278
be_bryan 0:b74591d5ab33 279 s1 += 18;
be_bryan 0:b74591d5ab33 280 if( s2 - s1 < 16 || pem_get_iv( s1, pem_iv, 8) != 0 )
be_bryan 0:b74591d5ab33 281 return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
be_bryan 0:b74591d5ab33 282
be_bryan 0:b74591d5ab33 283 s1 += 16;
be_bryan 0:b74591d5ab33 284 }
be_bryan 0:b74591d5ab33 285 #endif /* MBEDTLS_DES_C */
be_bryan 0:b74591d5ab33 286
be_bryan 0:b74591d5ab33 287 #if defined(MBEDTLS_AES_C)
be_bryan 0:b74591d5ab33 288 if( s2 - s1 >= 14 && memcmp( s1, "DEK-Info: AES-", 14 ) == 0 )
be_bryan 0:b74591d5ab33 289 {
be_bryan 0:b74591d5ab33 290 if( s2 - s1 < 22 )
be_bryan 0:b74591d5ab33 291 return( MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG );
be_bryan 0:b74591d5ab33 292 else if( memcmp( s1, "DEK-Info: AES-128-CBC,", 22 ) == 0 )
be_bryan 0:b74591d5ab33 293 enc_alg = MBEDTLS_CIPHER_AES_128_CBC;
be_bryan 0:b74591d5ab33 294 else if( memcmp( s1, "DEK-Info: AES-192-CBC,", 22 ) == 0 )
be_bryan 0:b74591d5ab33 295 enc_alg = MBEDTLS_CIPHER_AES_192_CBC;
be_bryan 0:b74591d5ab33 296 else if( memcmp( s1, "DEK-Info: AES-256-CBC,", 22 ) == 0 )
be_bryan 0:b74591d5ab33 297 enc_alg = MBEDTLS_CIPHER_AES_256_CBC;
be_bryan 0:b74591d5ab33 298 else
be_bryan 0:b74591d5ab33 299 return( MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG );
be_bryan 0:b74591d5ab33 300
be_bryan 0:b74591d5ab33 301 s1 += 22;
be_bryan 0:b74591d5ab33 302 if( s2 - s1 < 32 || pem_get_iv( s1, pem_iv, 16 ) != 0 )
be_bryan 0:b74591d5ab33 303 return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
be_bryan 0:b74591d5ab33 304
be_bryan 0:b74591d5ab33 305 s1 += 32;
be_bryan 0:b74591d5ab33 306 }
be_bryan 0:b74591d5ab33 307 #endif /* MBEDTLS_AES_C */
be_bryan 0:b74591d5ab33 308
be_bryan 0:b74591d5ab33 309 if( enc_alg == MBEDTLS_CIPHER_NONE )
be_bryan 0:b74591d5ab33 310 return( MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG );
be_bryan 0:b74591d5ab33 311
be_bryan 0:b74591d5ab33 312 if( *s1 == '\r' ) s1++;
be_bryan 0:b74591d5ab33 313 if( *s1 == '\n' ) s1++;
be_bryan 0:b74591d5ab33 314 else return( MBEDTLS_ERR_PEM_INVALID_DATA );
be_bryan 0:b74591d5ab33 315 #else
be_bryan 0:b74591d5ab33 316 return( MBEDTLS_ERR_PEM_FEATURE_UNAVAILABLE );
be_bryan 0:b74591d5ab33 317 #endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
be_bryan 0:b74591d5ab33 318 ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
be_bryan 0:b74591d5ab33 319 }
be_bryan 0:b74591d5ab33 320
be_bryan 0:b74591d5ab33 321 if( s1 >= s2 )
be_bryan 0:b74591d5ab33 322 return( MBEDTLS_ERR_PEM_INVALID_DATA );
be_bryan 0:b74591d5ab33 323
be_bryan 0:b74591d5ab33 324 ret = mbedtls_base64_decode( NULL, 0, &len, s1, s2 - s1 );
be_bryan 0:b74591d5ab33 325
be_bryan 0:b74591d5ab33 326 if( ret == MBEDTLS_ERR_BASE64_INVALID_CHARACTER )
be_bryan 0:b74591d5ab33 327 return( MBEDTLS_ERR_PEM_INVALID_DATA + ret );
be_bryan 0:b74591d5ab33 328
be_bryan 0:b74591d5ab33 329 if( ( buf = mbedtls_calloc( 1, len ) ) == NULL )
be_bryan 0:b74591d5ab33 330 return( MBEDTLS_ERR_PEM_ALLOC_FAILED );
be_bryan 0:b74591d5ab33 331
be_bryan 0:b74591d5ab33 332 if( ( ret = mbedtls_base64_decode( buf, len, &len, s1, s2 - s1 ) ) != 0 )
be_bryan 0:b74591d5ab33 333 {
be_bryan 0:b74591d5ab33 334 mbedtls_free( buf );
be_bryan 0:b74591d5ab33 335 return( MBEDTLS_ERR_PEM_INVALID_DATA + ret );
be_bryan 0:b74591d5ab33 336 }
be_bryan 0:b74591d5ab33 337
be_bryan 0:b74591d5ab33 338 if( enc != 0 )
be_bryan 0:b74591d5ab33 339 {
be_bryan 0:b74591d5ab33 340 #if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
be_bryan 0:b74591d5ab33 341 ( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
be_bryan 0:b74591d5ab33 342 if( pwd == NULL )
be_bryan 0:b74591d5ab33 343 {
be_bryan 0:b74591d5ab33 344 mbedtls_free( buf );
be_bryan 0:b74591d5ab33 345 return( MBEDTLS_ERR_PEM_PASSWORD_REQUIRED );
be_bryan 0:b74591d5ab33 346 }
be_bryan 0:b74591d5ab33 347
be_bryan 0:b74591d5ab33 348 #if defined(MBEDTLS_DES_C)
be_bryan 0:b74591d5ab33 349 if( enc_alg == MBEDTLS_CIPHER_DES_EDE3_CBC )
be_bryan 0:b74591d5ab33 350 pem_des3_decrypt( pem_iv, buf, len, pwd, pwdlen );
be_bryan 0:b74591d5ab33 351 else if( enc_alg == MBEDTLS_CIPHER_DES_CBC )
be_bryan 0:b74591d5ab33 352 pem_des_decrypt( pem_iv, buf, len, pwd, pwdlen );
be_bryan 0:b74591d5ab33 353 #endif /* MBEDTLS_DES_C */
be_bryan 0:b74591d5ab33 354
be_bryan 0:b74591d5ab33 355 #if defined(MBEDTLS_AES_C)
be_bryan 0:b74591d5ab33 356 if( enc_alg == MBEDTLS_CIPHER_AES_128_CBC )
be_bryan 0:b74591d5ab33 357 pem_aes_decrypt( pem_iv, 16, buf, len, pwd, pwdlen );
be_bryan 0:b74591d5ab33 358 else if( enc_alg == MBEDTLS_CIPHER_AES_192_CBC )
be_bryan 0:b74591d5ab33 359 pem_aes_decrypt( pem_iv, 24, buf, len, pwd, pwdlen );
be_bryan 0:b74591d5ab33 360 else if( enc_alg == MBEDTLS_CIPHER_AES_256_CBC )
be_bryan 0:b74591d5ab33 361 pem_aes_decrypt( pem_iv, 32, buf, len, pwd, pwdlen );
be_bryan 0:b74591d5ab33 362 #endif /* MBEDTLS_AES_C */
be_bryan 0:b74591d5ab33 363
be_bryan 0:b74591d5ab33 364 /*
be_bryan 0:b74591d5ab33 365 * The result will be ASN.1 starting with a SEQUENCE tag, with 1 to 3
be_bryan 0:b74591d5ab33 366 * length bytes (allow 4 to be sure) in all known use cases.
be_bryan 0:b74591d5ab33 367 *
be_bryan 0:b74591d5ab33 368 * Use that as heurisitic to try detecting password mismatchs.
be_bryan 0:b74591d5ab33 369 */
be_bryan 0:b74591d5ab33 370 if( len <= 2 || buf[0] != 0x30 || buf[1] > 0x83 )
be_bryan 0:b74591d5ab33 371 {
be_bryan 0:b74591d5ab33 372 mbedtls_free( buf );
be_bryan 0:b74591d5ab33 373 return( MBEDTLS_ERR_PEM_PASSWORD_MISMATCH );
be_bryan 0:b74591d5ab33 374 }
be_bryan 0:b74591d5ab33 375 #else
be_bryan 0:b74591d5ab33 376 mbedtls_free( buf );
be_bryan 0:b74591d5ab33 377 return( MBEDTLS_ERR_PEM_FEATURE_UNAVAILABLE );
be_bryan 0:b74591d5ab33 378 #endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
be_bryan 0:b74591d5ab33 379 ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
be_bryan 0:b74591d5ab33 380 }
be_bryan 0:b74591d5ab33 381
be_bryan 0:b74591d5ab33 382 ctx->buf = buf;
be_bryan 0:b74591d5ab33 383 ctx->buflen = len;
be_bryan 0:b74591d5ab33 384
be_bryan 0:b74591d5ab33 385 return( 0 );
be_bryan 0:b74591d5ab33 386 }
be_bryan 0:b74591d5ab33 387
be_bryan 0:b74591d5ab33 388 void mbedtls_pem_free( mbedtls_pem_context *ctx )
be_bryan 0:b74591d5ab33 389 {
be_bryan 0:b74591d5ab33 390 mbedtls_free( ctx->buf );
be_bryan 0:b74591d5ab33 391 mbedtls_free( ctx->info );
be_bryan 0:b74591d5ab33 392
be_bryan 0:b74591d5ab33 393 mbedtls_zeroize( ctx, sizeof( mbedtls_pem_context ) );
be_bryan 0:b74591d5ab33 394 }
be_bryan 0:b74591d5ab33 395 #endif /* MBEDTLS_PEM_PARSE_C */
be_bryan 0:b74591d5ab33 396
be_bryan 0:b74591d5ab33 397 #if defined(MBEDTLS_PEM_WRITE_C)
be_bryan 0:b74591d5ab33 398 int mbedtls_pem_write_buffer( const char *header, const char *footer,
be_bryan 0:b74591d5ab33 399 const unsigned char *der_data, size_t der_len,
be_bryan 0:b74591d5ab33 400 unsigned char *buf, size_t buf_len, size_t *olen )
be_bryan 0:b74591d5ab33 401 {
be_bryan 0:b74591d5ab33 402 int ret;
be_bryan 0:b74591d5ab33 403 unsigned char *encode_buf, *c, *p = buf;
be_bryan 0:b74591d5ab33 404 size_t len = 0, use_len, add_len = 0;
be_bryan 0:b74591d5ab33 405
be_bryan 0:b74591d5ab33 406 mbedtls_base64_encode( NULL, 0, &use_len, der_data, der_len );
be_bryan 0:b74591d5ab33 407 add_len = strlen( header ) + strlen( footer ) + ( use_len / 64 ) + 1;
be_bryan 0:b74591d5ab33 408
be_bryan 0:b74591d5ab33 409 if( use_len + add_len > buf_len )
be_bryan 0:b74591d5ab33 410 {
be_bryan 0:b74591d5ab33 411 *olen = use_len + add_len;
be_bryan 0:b74591d5ab33 412 return( MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL );
be_bryan 0:b74591d5ab33 413 }
be_bryan 0:b74591d5ab33 414
be_bryan 0:b74591d5ab33 415 if( ( encode_buf = mbedtls_calloc( 1, use_len ) ) == NULL )
be_bryan 0:b74591d5ab33 416 return( MBEDTLS_ERR_PEM_ALLOC_FAILED );
be_bryan 0:b74591d5ab33 417
be_bryan 0:b74591d5ab33 418 if( ( ret = mbedtls_base64_encode( encode_buf, use_len, &use_len, der_data,
be_bryan 0:b74591d5ab33 419 der_len ) ) != 0 )
be_bryan 0:b74591d5ab33 420 {
be_bryan 0:b74591d5ab33 421 mbedtls_free( encode_buf );
be_bryan 0:b74591d5ab33 422 return( ret );
be_bryan 0:b74591d5ab33 423 }
be_bryan 0:b74591d5ab33 424
be_bryan 0:b74591d5ab33 425 memcpy( p, header, strlen( header ) );
be_bryan 0:b74591d5ab33 426 p += strlen( header );
be_bryan 0:b74591d5ab33 427 c = encode_buf;
be_bryan 0:b74591d5ab33 428
be_bryan 0:b74591d5ab33 429 while( use_len )
be_bryan 0:b74591d5ab33 430 {
be_bryan 0:b74591d5ab33 431 len = ( use_len > 64 ) ? 64 : use_len;
be_bryan 0:b74591d5ab33 432 memcpy( p, c, len );
be_bryan 0:b74591d5ab33 433 use_len -= len;
be_bryan 0:b74591d5ab33 434 p += len;
be_bryan 0:b74591d5ab33 435 c += len;
be_bryan 0:b74591d5ab33 436 *p++ = '\n';
be_bryan 0:b74591d5ab33 437 }
be_bryan 0:b74591d5ab33 438
be_bryan 0:b74591d5ab33 439 memcpy( p, footer, strlen( footer ) );
be_bryan 0:b74591d5ab33 440 p += strlen( footer );
be_bryan 0:b74591d5ab33 441
be_bryan 0:b74591d5ab33 442 *p++ = '\0';
be_bryan 0:b74591d5ab33 443 *olen = p - buf;
be_bryan 0:b74591d5ab33 444
be_bryan 0:b74591d5ab33 445 mbedtls_free( encode_buf );
be_bryan 0:b74591d5ab33 446 return( 0 );
be_bryan 0:b74591d5ab33 447 }
be_bryan 0:b74591d5ab33 448 #endif /* MBEDTLS_PEM_WRITE_C */
be_bryan 0:b74591d5ab33 449 #endif /* MBEDTLS_PEM_PARSE_C || MBEDTLS_PEM_WRITE_C */