Nicolas Borla / Mbed OS BBR_1Ebene

BBR 1 Ebene

mbed-os/features/mbedtls/src/pem.c@0:fbdae7e6d805, 2018-05-14 (annotated)

Committer:
borlanic
Date:
Mon May 14 11:29:06 2018 +0000
Revision:
0:fbdae7e6d805
BBR

Who changed what in which revision?

UserRevisionLine numberNew contents of line
borlanic 0:fbdae7e6d805 1 /*
borlanic 0:fbdae7e6d805 2 * Privacy Enhanced Mail (PEM) decoding
borlanic 0:fbdae7e6d805 3 *
borlanic 0:fbdae7e6d805 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
borlanic 0:fbdae7e6d805 5 * SPDX-License-Identifier: Apache-2.0
borlanic 0:fbdae7e6d805 6 *
borlanic 0:fbdae7e6d805 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
borlanic 0:fbdae7e6d805 8 * not use this file except in compliance with the License.
borlanic 0:fbdae7e6d805 9 * You may obtain a copy of the License at
borlanic 0:fbdae7e6d805 10 *
borlanic 0:fbdae7e6d805 11 * http://www.apache.org/licenses/LICENSE-2.0
borlanic 0:fbdae7e6d805 12 *
borlanic 0:fbdae7e6d805 13 * Unless required by applicable law or agreed to in writing, software
borlanic 0:fbdae7e6d805 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
borlanic 0:fbdae7e6d805 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
borlanic 0:fbdae7e6d805 16 * See the License for the specific language governing permissions and
borlanic 0:fbdae7e6d805 17 * limitations under the License.
borlanic 0:fbdae7e6d805 18 *
borlanic 0:fbdae7e6d805 19 * This file is part of mbed TLS (https://tls.mbed.org)
borlanic 0:fbdae7e6d805 20 */
borlanic 0:fbdae7e6d805 21
borlanic 0:fbdae7e6d805 22 #if !defined(MBEDTLS_CONFIG_FILE)
borlanic 0:fbdae7e6d805 23 #include "mbedtls/config.h"
borlanic 0:fbdae7e6d805 24 #else
borlanic 0:fbdae7e6d805 25 #include MBEDTLS_CONFIG_FILE
borlanic 0:fbdae7e6d805 26 #endif
borlanic 0:fbdae7e6d805 27
borlanic 0:fbdae7e6d805 28 #if defined(MBEDTLS_PEM_PARSE_C) || defined(MBEDTLS_PEM_WRITE_C)
borlanic 0:fbdae7e6d805 29
borlanic 0:fbdae7e6d805 30 #include "mbedtls/pem.h"
borlanic 0:fbdae7e6d805 31 #include "mbedtls/base64.h"
borlanic 0:fbdae7e6d805 32 #include "mbedtls/des.h"
borlanic 0:fbdae7e6d805 33 #include "mbedtls/aes.h"
borlanic 0:fbdae7e6d805 34 #include "mbedtls/md5.h"
borlanic 0:fbdae7e6d805 35 #include "mbedtls/cipher.h"
borlanic 0:fbdae7e6d805 36
borlanic 0:fbdae7e6d805 37 #include <string.h>
borlanic 0:fbdae7e6d805 38
borlanic 0:fbdae7e6d805 39 #if defined(MBEDTLS_PLATFORM_C)
borlanic 0:fbdae7e6d805 40 #include "mbedtls/platform.h"
borlanic 0:fbdae7e6d805 41 #else
borlanic 0:fbdae7e6d805 42 #include <stdlib.h>
borlanic 0:fbdae7e6d805 43 #define mbedtls_calloc calloc
borlanic 0:fbdae7e6d805 44 #define mbedtls_free free
borlanic 0:fbdae7e6d805 45 #endif
borlanic 0:fbdae7e6d805 46
borlanic 0:fbdae7e6d805 47 #if defined(MBEDTLS_PEM_PARSE_C)
borlanic 0:fbdae7e6d805 48 /* Implementation that should never be optimized out by the compiler */
borlanic 0:fbdae7e6d805 49 static void mbedtls_zeroize( void *v, size_t n ) {
borlanic 0:fbdae7e6d805 50 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
borlanic 0:fbdae7e6d805 51 }
borlanic 0:fbdae7e6d805 52
borlanic 0:fbdae7e6d805 53 void mbedtls_pem_init( mbedtls_pem_context *ctx )
borlanic 0:fbdae7e6d805 54 {
borlanic 0:fbdae7e6d805 55 memset( ctx, 0, sizeof( mbedtls_pem_context ) );
borlanic 0:fbdae7e6d805 56 }
borlanic 0:fbdae7e6d805 57
borlanic 0:fbdae7e6d805 58 #if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
borlanic 0:fbdae7e6d805 59 ( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
borlanic 0:fbdae7e6d805 60 /*
borlanic 0:fbdae7e6d805 61 * Read a 16-byte hex string and convert it to binary
borlanic 0:fbdae7e6d805 62 */
borlanic 0:fbdae7e6d805 63 static int pem_get_iv( const unsigned char *s, unsigned char *iv,
borlanic 0:fbdae7e6d805 64 size_t iv_len )
borlanic 0:fbdae7e6d805 65 {
borlanic 0:fbdae7e6d805 66 size_t i, j, k;
borlanic 0:fbdae7e6d805 67
borlanic 0:fbdae7e6d805 68 memset( iv, 0, iv_len );
borlanic 0:fbdae7e6d805 69
borlanic 0:fbdae7e6d805 70 for( i = 0; i < iv_len * 2; i++, s++ )
borlanic 0:fbdae7e6d805 71 {
borlanic 0:fbdae7e6d805 72 if( *s >= '0' && *s <= '9' ) j = *s - '0'; else
borlanic 0:fbdae7e6d805 73 if( *s >= 'A' && *s <= 'F' ) j = *s - '7'; else
borlanic 0:fbdae7e6d805 74 if( *s >= 'a' && *s <= 'f' ) j = *s - 'W'; else
borlanic 0:fbdae7e6d805 75 return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
borlanic 0:fbdae7e6d805 76
borlanic 0:fbdae7e6d805 77 k = ( ( i & 1 ) != 0 ) ? j : j << 4;
borlanic 0:fbdae7e6d805 78
borlanic 0:fbdae7e6d805 79 iv[i >> 1] = (unsigned char)( iv[i >> 1] | k );
borlanic 0:fbdae7e6d805 80 }
borlanic 0:fbdae7e6d805 81
borlanic 0:fbdae7e6d805 82 return( 0 );
borlanic 0:fbdae7e6d805 83 }
borlanic 0:fbdae7e6d805 84
borlanic 0:fbdae7e6d805 85 static int pem_pbkdf1( unsigned char *key, size_t keylen,
borlanic 0:fbdae7e6d805 86 unsigned char *iv,
borlanic 0:fbdae7e6d805 87 const unsigned char *pwd, size_t pwdlen )
borlanic 0:fbdae7e6d805 88 {
borlanic 0:fbdae7e6d805 89 mbedtls_md5_context md5_ctx;
borlanic 0:fbdae7e6d805 90 unsigned char md5sum[16];
borlanic 0:fbdae7e6d805 91 size_t use_len;
borlanic 0:fbdae7e6d805 92 int ret;
borlanic 0:fbdae7e6d805 93
borlanic 0:fbdae7e6d805 94 mbedtls_md5_init( &md5_ctx );
borlanic 0:fbdae7e6d805 95
borlanic 0:fbdae7e6d805 96 /*
borlanic 0:fbdae7e6d805 97 * key[ 0..15] = MD5(pwd || IV)
borlanic 0:fbdae7e6d805 98 */
borlanic 0:fbdae7e6d805 99 if( ( ret = mbedtls_md5_starts_ret( &md5_ctx ) ) != 0 )
borlanic 0:fbdae7e6d805 100 goto exit;
borlanic 0:fbdae7e6d805 101 if( ( ret = mbedtls_md5_update_ret( &md5_ctx, pwd, pwdlen ) ) != 0 )
borlanic 0:fbdae7e6d805 102 goto exit;
borlanic 0:fbdae7e6d805 103 if( ( ret = mbedtls_md5_update_ret( &md5_ctx, iv, 8 ) ) != 0 )
borlanic 0:fbdae7e6d805 104 goto exit;
borlanic 0:fbdae7e6d805 105 if( ( ret = mbedtls_md5_finish_ret( &md5_ctx, md5sum ) ) != 0 )
borlanic 0:fbdae7e6d805 106 goto exit;
borlanic 0:fbdae7e6d805 107
borlanic 0:fbdae7e6d805 108 if( keylen <= 16 )
borlanic 0:fbdae7e6d805 109 {
borlanic 0:fbdae7e6d805 110 memcpy( key, md5sum, keylen );
borlanic 0:fbdae7e6d805 111 goto exit;
borlanic 0:fbdae7e6d805 112 }
borlanic 0:fbdae7e6d805 113
borlanic 0:fbdae7e6d805 114 memcpy( key, md5sum, 16 );
borlanic 0:fbdae7e6d805 115
borlanic 0:fbdae7e6d805 116 /*
borlanic 0:fbdae7e6d805 117 * key[16..23] = MD5(key[ 0..15] || pwd || IV])
borlanic 0:fbdae7e6d805 118 */
borlanic 0:fbdae7e6d805 119 if( ( ret = mbedtls_md5_starts_ret( &md5_ctx ) ) != 0 )
borlanic 0:fbdae7e6d805 120 goto exit;
borlanic 0:fbdae7e6d805 121 if( ( ret = mbedtls_md5_update_ret( &md5_ctx, md5sum, 16 ) ) != 0 )
borlanic 0:fbdae7e6d805 122 goto exit;
borlanic 0:fbdae7e6d805 123 if( ( ret = mbedtls_md5_update_ret( &md5_ctx, pwd, pwdlen ) ) != 0 )
borlanic 0:fbdae7e6d805 124 goto exit;
borlanic 0:fbdae7e6d805 125 if( ( ret = mbedtls_md5_update_ret( &md5_ctx, iv, 8 ) ) != 0 )
borlanic 0:fbdae7e6d805 126 goto exit;
borlanic 0:fbdae7e6d805 127 if( ( ret = mbedtls_md5_finish_ret( &md5_ctx, md5sum ) ) != 0 )
borlanic 0:fbdae7e6d805 128 goto exit;
borlanic 0:fbdae7e6d805 129
borlanic 0:fbdae7e6d805 130 use_len = 16;
borlanic 0:fbdae7e6d805 131 if( keylen < 32 )
borlanic 0:fbdae7e6d805 132 use_len = keylen - 16;
borlanic 0:fbdae7e6d805 133
borlanic 0:fbdae7e6d805 134 memcpy( key + 16, md5sum, use_len );
borlanic 0:fbdae7e6d805 135
borlanic 0:fbdae7e6d805 136 exit:
borlanic 0:fbdae7e6d805 137 mbedtls_md5_free( &md5_ctx );
borlanic 0:fbdae7e6d805 138 mbedtls_zeroize( md5sum, 16 );
borlanic 0:fbdae7e6d805 139
borlanic 0:fbdae7e6d805 140 return( ret );
borlanic 0:fbdae7e6d805 141 }
borlanic 0:fbdae7e6d805 142
borlanic 0:fbdae7e6d805 143 #if defined(MBEDTLS_DES_C)
borlanic 0:fbdae7e6d805 144 /*
borlanic 0:fbdae7e6d805 145 * Decrypt with DES-CBC, using PBKDF1 for key derivation
borlanic 0:fbdae7e6d805 146 */
borlanic 0:fbdae7e6d805 147 static int pem_des_decrypt( unsigned char des_iv[8],
borlanic 0:fbdae7e6d805 148 unsigned char *buf, size_t buflen,
borlanic 0:fbdae7e6d805 149 const unsigned char *pwd, size_t pwdlen )
borlanic 0:fbdae7e6d805 150 {
borlanic 0:fbdae7e6d805 151 mbedtls_des_context des_ctx;
borlanic 0:fbdae7e6d805 152 unsigned char des_key[8];
borlanic 0:fbdae7e6d805 153 int ret;
borlanic 0:fbdae7e6d805 154
borlanic 0:fbdae7e6d805 155 mbedtls_des_init( &des_ctx );
borlanic 0:fbdae7e6d805 156
borlanic 0:fbdae7e6d805 157 if( ( ret = pem_pbkdf1( des_key, 8, des_iv, pwd, pwdlen ) ) != 0 )
borlanic 0:fbdae7e6d805 158 goto exit;
borlanic 0:fbdae7e6d805 159
borlanic 0:fbdae7e6d805 160 if( ( ret = mbedtls_des_setkey_dec( &des_ctx, des_key ) ) != 0 )
borlanic 0:fbdae7e6d805 161 goto exit;
borlanic 0:fbdae7e6d805 162 ret = mbedtls_des_crypt_cbc( &des_ctx, MBEDTLS_DES_DECRYPT, buflen,
borlanic 0:fbdae7e6d805 163 des_iv, buf, buf );
borlanic 0:fbdae7e6d805 164
borlanic 0:fbdae7e6d805 165 exit:
borlanic 0:fbdae7e6d805 166 mbedtls_des_free( &des_ctx );
borlanic 0:fbdae7e6d805 167 mbedtls_zeroize( des_key, 8 );
borlanic 0:fbdae7e6d805 168
borlanic 0:fbdae7e6d805 169 return( ret );
borlanic 0:fbdae7e6d805 170 }
borlanic 0:fbdae7e6d805 171
borlanic 0:fbdae7e6d805 172 /*
borlanic 0:fbdae7e6d805 173 * Decrypt with 3DES-CBC, using PBKDF1 for key derivation
borlanic 0:fbdae7e6d805 174 */
borlanic 0:fbdae7e6d805 175 static int pem_des3_decrypt( unsigned char des3_iv[8],
borlanic 0:fbdae7e6d805 176 unsigned char *buf, size_t buflen,
borlanic 0:fbdae7e6d805 177 const unsigned char *pwd, size_t pwdlen )
borlanic 0:fbdae7e6d805 178 {
borlanic 0:fbdae7e6d805 179 mbedtls_des3_context des3_ctx;
borlanic 0:fbdae7e6d805 180 unsigned char des3_key[24];
borlanic 0:fbdae7e6d805 181 int ret;
borlanic 0:fbdae7e6d805 182
borlanic 0:fbdae7e6d805 183 mbedtls_des3_init( &des3_ctx );
borlanic 0:fbdae7e6d805 184
borlanic 0:fbdae7e6d805 185 if( ( ret = pem_pbkdf1( des3_key, 24, des3_iv, pwd, pwdlen ) ) != 0 )
borlanic 0:fbdae7e6d805 186 goto exit;
borlanic 0:fbdae7e6d805 187
borlanic 0:fbdae7e6d805 188 if( ( ret = mbedtls_des3_set3key_dec( &des3_ctx, des3_key ) ) != 0 )
borlanic 0:fbdae7e6d805 189 goto exit;
borlanic 0:fbdae7e6d805 190 ret = mbedtls_des3_crypt_cbc( &des3_ctx, MBEDTLS_DES_DECRYPT, buflen,
borlanic 0:fbdae7e6d805 191 des3_iv, buf, buf );
borlanic 0:fbdae7e6d805 192
borlanic 0:fbdae7e6d805 193 exit:
borlanic 0:fbdae7e6d805 194 mbedtls_des3_free( &des3_ctx );
borlanic 0:fbdae7e6d805 195 mbedtls_zeroize( des3_key, 24 );
borlanic 0:fbdae7e6d805 196
borlanic 0:fbdae7e6d805 197 return( ret );
borlanic 0:fbdae7e6d805 198 }
borlanic 0:fbdae7e6d805 199 #endif /* MBEDTLS_DES_C */
borlanic 0:fbdae7e6d805 200
borlanic 0:fbdae7e6d805 201 #if defined(MBEDTLS_AES_C)
borlanic 0:fbdae7e6d805 202 /*
borlanic 0:fbdae7e6d805 203 * Decrypt with AES-XXX-CBC, using PBKDF1 for key derivation
borlanic 0:fbdae7e6d805 204 */
borlanic 0:fbdae7e6d805 205 static int pem_aes_decrypt( unsigned char aes_iv[16], unsigned int keylen,
borlanic 0:fbdae7e6d805 206 unsigned char *buf, size_t buflen,
borlanic 0:fbdae7e6d805 207 const unsigned char *pwd, size_t pwdlen )
borlanic 0:fbdae7e6d805 208 {
borlanic 0:fbdae7e6d805 209 mbedtls_aes_context aes_ctx;
borlanic 0:fbdae7e6d805 210 unsigned char aes_key[32];
borlanic 0:fbdae7e6d805 211 int ret;
borlanic 0:fbdae7e6d805 212
borlanic 0:fbdae7e6d805 213 mbedtls_aes_init( &aes_ctx );
borlanic 0:fbdae7e6d805 214
borlanic 0:fbdae7e6d805 215 if( ( ret = pem_pbkdf1( aes_key, keylen, aes_iv, pwd, pwdlen ) ) != 0 )
borlanic 0:fbdae7e6d805 216 goto exit;
borlanic 0:fbdae7e6d805 217
borlanic 0:fbdae7e6d805 218 if( ( ret = mbedtls_aes_setkey_dec( &aes_ctx, aes_key, keylen * 8 ) ) != 0 )
borlanic 0:fbdae7e6d805 219 goto exit;
borlanic 0:fbdae7e6d805 220 ret = mbedtls_aes_crypt_cbc( &aes_ctx, MBEDTLS_AES_DECRYPT, buflen,
borlanic 0:fbdae7e6d805 221 aes_iv, buf, buf );
borlanic 0:fbdae7e6d805 222
borlanic 0:fbdae7e6d805 223 exit:
borlanic 0:fbdae7e6d805 224 mbedtls_aes_free( &aes_ctx );
borlanic 0:fbdae7e6d805 225 mbedtls_zeroize( aes_key, keylen );
borlanic 0:fbdae7e6d805 226
borlanic 0:fbdae7e6d805 227 return( ret );
borlanic 0:fbdae7e6d805 228 }
borlanic 0:fbdae7e6d805 229 #endif /* MBEDTLS_AES_C */
borlanic 0:fbdae7e6d805 230
borlanic 0:fbdae7e6d805 231 #endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
borlanic 0:fbdae7e6d805 232 ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
borlanic 0:fbdae7e6d805 233
borlanic 0:fbdae7e6d805 234 int mbedtls_pem_read_buffer( mbedtls_pem_context *ctx, const char *header, const char *footer,
borlanic 0:fbdae7e6d805 235 const unsigned char *data, const unsigned char *pwd,
borlanic 0:fbdae7e6d805 236 size_t pwdlen, size_t *use_len )
borlanic 0:fbdae7e6d805 237 {
borlanic 0:fbdae7e6d805 238 int ret, enc;
borlanic 0:fbdae7e6d805 239 size_t len;
borlanic 0:fbdae7e6d805 240 unsigned char *buf;
borlanic 0:fbdae7e6d805 241 const unsigned char *s1, *s2, *end;
borlanic 0:fbdae7e6d805 242 #if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
borlanic 0:fbdae7e6d805 243 ( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
borlanic 0:fbdae7e6d805 244 unsigned char pem_iv[16];
borlanic 0:fbdae7e6d805 245 mbedtls_cipher_type_t enc_alg = MBEDTLS_CIPHER_NONE;
borlanic 0:fbdae7e6d805 246 #else
borlanic 0:fbdae7e6d805 247 ((void) pwd);
borlanic 0:fbdae7e6d805 248 ((void) pwdlen);
borlanic 0:fbdae7e6d805 249 #endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
borlanic 0:fbdae7e6d805 250 ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
borlanic 0:fbdae7e6d805 251
borlanic 0:fbdae7e6d805 252 if( ctx == NULL )
borlanic 0:fbdae7e6d805 253 return( MBEDTLS_ERR_PEM_BAD_INPUT_DATA );
borlanic 0:fbdae7e6d805 254
borlanic 0:fbdae7e6d805 255 s1 = (unsigned char *) strstr( (const char *) data, header );
borlanic 0:fbdae7e6d805 256
borlanic 0:fbdae7e6d805 257 if( s1 == NULL )
borlanic 0:fbdae7e6d805 258 return( MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT );
borlanic 0:fbdae7e6d805 259
borlanic 0:fbdae7e6d805 260 s2 = (unsigned char *) strstr( (const char *) data, footer );
borlanic 0:fbdae7e6d805 261
borlanic 0:fbdae7e6d805 262 if( s2 == NULL || s2 <= s1 )
borlanic 0:fbdae7e6d805 263 return( MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT );
borlanic 0:fbdae7e6d805 264
borlanic 0:fbdae7e6d805 265 s1 += strlen( header );
borlanic 0:fbdae7e6d805 266 if( *s1 == ' ' ) s1++;
borlanic 0:fbdae7e6d805 267 if( *s1 == '\r' ) s1++;
borlanic 0:fbdae7e6d805 268 if( *s1 == '\n' ) s1++;
borlanic 0:fbdae7e6d805 269 else return( MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT );
borlanic 0:fbdae7e6d805 270
borlanic 0:fbdae7e6d805 271 end = s2;
borlanic 0:fbdae7e6d805 272 end += strlen( footer );
borlanic 0:fbdae7e6d805 273 if( *end == ' ' ) end++;
borlanic 0:fbdae7e6d805 274 if( *end == '\r' ) end++;
borlanic 0:fbdae7e6d805 275 if( *end == '\n' ) end++;
borlanic 0:fbdae7e6d805 276 *use_len = end - data;
borlanic 0:fbdae7e6d805 277
borlanic 0:fbdae7e6d805 278 enc = 0;
borlanic 0:fbdae7e6d805 279
borlanic 0:fbdae7e6d805 280 if( s2 - s1 >= 22 && memcmp( s1, "Proc-Type: 4,ENCRYPTED", 22 ) == 0 )
borlanic 0:fbdae7e6d805 281 {
borlanic 0:fbdae7e6d805 282 #if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
borlanic 0:fbdae7e6d805 283 ( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
borlanic 0:fbdae7e6d805 284 enc++;
borlanic 0:fbdae7e6d805 285
borlanic 0:fbdae7e6d805 286 s1 += 22;
borlanic 0:fbdae7e6d805 287 if( *s1 == '\r' ) s1++;
borlanic 0:fbdae7e6d805 288 if( *s1 == '\n' ) s1++;
borlanic 0:fbdae7e6d805 289 else return( MBEDTLS_ERR_PEM_INVALID_DATA );
borlanic 0:fbdae7e6d805 290
borlanic 0:fbdae7e6d805 291
borlanic 0:fbdae7e6d805 292 #if defined(MBEDTLS_DES_C)
borlanic 0:fbdae7e6d805 293 if( s2 - s1 >= 23 && memcmp( s1, "DEK-Info: DES-EDE3-CBC,", 23 ) == 0 )
borlanic 0:fbdae7e6d805 294 {
borlanic 0:fbdae7e6d805 295 enc_alg = MBEDTLS_CIPHER_DES_EDE3_CBC;
borlanic 0:fbdae7e6d805 296
borlanic 0:fbdae7e6d805 297 s1 += 23;
borlanic 0:fbdae7e6d805 298 if( s2 - s1 < 16 || pem_get_iv( s1, pem_iv, 8 ) != 0 )
borlanic 0:fbdae7e6d805 299 return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
borlanic 0:fbdae7e6d805 300
borlanic 0:fbdae7e6d805 301 s1 += 16;
borlanic 0:fbdae7e6d805 302 }
borlanic 0:fbdae7e6d805 303 else if( s2 - s1 >= 18 && memcmp( s1, "DEK-Info: DES-CBC,", 18 ) == 0 )
borlanic 0:fbdae7e6d805 304 {
borlanic 0:fbdae7e6d805 305 enc_alg = MBEDTLS_CIPHER_DES_CBC;
borlanic 0:fbdae7e6d805 306
borlanic 0:fbdae7e6d805 307 s1 += 18;
borlanic 0:fbdae7e6d805 308 if( s2 - s1 < 16 || pem_get_iv( s1, pem_iv, 8) != 0 )
borlanic 0:fbdae7e6d805 309 return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
borlanic 0:fbdae7e6d805 310
borlanic 0:fbdae7e6d805 311 s1 += 16;
borlanic 0:fbdae7e6d805 312 }
borlanic 0:fbdae7e6d805 313 #endif /* MBEDTLS_DES_C */
borlanic 0:fbdae7e6d805 314
borlanic 0:fbdae7e6d805 315 #if defined(MBEDTLS_AES_C)
borlanic 0:fbdae7e6d805 316 if( s2 - s1 >= 14 && memcmp( s1, "DEK-Info: AES-", 14 ) == 0 )
borlanic 0:fbdae7e6d805 317 {
borlanic 0:fbdae7e6d805 318 if( s2 - s1 < 22 )
borlanic 0:fbdae7e6d805 319 return( MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG );
borlanic 0:fbdae7e6d805 320 else if( memcmp( s1, "DEK-Info: AES-128-CBC,", 22 ) == 0 )
borlanic 0:fbdae7e6d805 321 enc_alg = MBEDTLS_CIPHER_AES_128_CBC;
borlanic 0:fbdae7e6d805 322 else if( memcmp( s1, "DEK-Info: AES-192-CBC,", 22 ) == 0 )
borlanic 0:fbdae7e6d805 323 enc_alg = MBEDTLS_CIPHER_AES_192_CBC;
borlanic 0:fbdae7e6d805 324 else if( memcmp( s1, "DEK-Info: AES-256-CBC,", 22 ) == 0 )
borlanic 0:fbdae7e6d805 325 enc_alg = MBEDTLS_CIPHER_AES_256_CBC;
borlanic 0:fbdae7e6d805 326 else
borlanic 0:fbdae7e6d805 327 return( MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG );
borlanic 0:fbdae7e6d805 328
borlanic 0:fbdae7e6d805 329 s1 += 22;
borlanic 0:fbdae7e6d805 330 if( s2 - s1 < 32 || pem_get_iv( s1, pem_iv, 16 ) != 0 )
borlanic 0:fbdae7e6d805 331 return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
borlanic 0:fbdae7e6d805 332
borlanic 0:fbdae7e6d805 333 s1 += 32;
borlanic 0:fbdae7e6d805 334 }
borlanic 0:fbdae7e6d805 335 #endif /* MBEDTLS_AES_C */
borlanic 0:fbdae7e6d805 336
borlanic 0:fbdae7e6d805 337 if( enc_alg == MBEDTLS_CIPHER_NONE )
borlanic 0:fbdae7e6d805 338 return( MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG );
borlanic 0:fbdae7e6d805 339
borlanic 0:fbdae7e6d805 340 if( *s1 == '\r' ) s1++;
borlanic 0:fbdae7e6d805 341 if( *s1 == '\n' ) s1++;
borlanic 0:fbdae7e6d805 342 else return( MBEDTLS_ERR_PEM_INVALID_DATA );
borlanic 0:fbdae7e6d805 343 #else
borlanic 0:fbdae7e6d805 344 return( MBEDTLS_ERR_PEM_FEATURE_UNAVAILABLE );
borlanic 0:fbdae7e6d805 345 #endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
borlanic 0:fbdae7e6d805 346 ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
borlanic 0:fbdae7e6d805 347 }
borlanic 0:fbdae7e6d805 348
borlanic 0:fbdae7e6d805 349 if( s1 >= s2 )
borlanic 0:fbdae7e6d805 350 return( MBEDTLS_ERR_PEM_INVALID_DATA );
borlanic 0:fbdae7e6d805 351
borlanic 0:fbdae7e6d805 352 ret = mbedtls_base64_decode( NULL, 0, &len, s1, s2 - s1 );
borlanic 0:fbdae7e6d805 353
borlanic 0:fbdae7e6d805 354 if( ret == MBEDTLS_ERR_BASE64_INVALID_CHARACTER )
borlanic 0:fbdae7e6d805 355 return( MBEDTLS_ERR_PEM_INVALID_DATA + ret );
borlanic 0:fbdae7e6d805 356
borlanic 0:fbdae7e6d805 357 if( ( buf = mbedtls_calloc( 1, len ) ) == NULL )
borlanic 0:fbdae7e6d805 358 return( MBEDTLS_ERR_PEM_ALLOC_FAILED );
borlanic 0:fbdae7e6d805 359
borlanic 0:fbdae7e6d805 360 if( ( ret = mbedtls_base64_decode( buf, len, &len, s1, s2 - s1 ) ) != 0 )
borlanic 0:fbdae7e6d805 361 {
borlanic 0:fbdae7e6d805 362 mbedtls_zeroize( buf, len );
borlanic 0:fbdae7e6d805 363 mbedtls_free( buf );
borlanic 0:fbdae7e6d805 364 return( MBEDTLS_ERR_PEM_INVALID_DATA + ret );
borlanic 0:fbdae7e6d805 365 }
borlanic 0:fbdae7e6d805 366
borlanic 0:fbdae7e6d805 367 if( enc != 0 )
borlanic 0:fbdae7e6d805 368 {
borlanic 0:fbdae7e6d805 369 #if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
borlanic 0:fbdae7e6d805 370 ( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
borlanic 0:fbdae7e6d805 371 if( pwd == NULL )
borlanic 0:fbdae7e6d805 372 {
borlanic 0:fbdae7e6d805 373 mbedtls_zeroize( buf, len );
borlanic 0:fbdae7e6d805 374 mbedtls_free( buf );
borlanic 0:fbdae7e6d805 375 return( MBEDTLS_ERR_PEM_PASSWORD_REQUIRED );
borlanic 0:fbdae7e6d805 376 }
borlanic 0:fbdae7e6d805 377
borlanic 0:fbdae7e6d805 378 ret = 0;
borlanic 0:fbdae7e6d805 379
borlanic 0:fbdae7e6d805 380 #if defined(MBEDTLS_DES_C)
borlanic 0:fbdae7e6d805 381 if( enc_alg == MBEDTLS_CIPHER_DES_EDE3_CBC )
borlanic 0:fbdae7e6d805 382 ret = pem_des3_decrypt( pem_iv, buf, len, pwd, pwdlen );
borlanic 0:fbdae7e6d805 383 else if( enc_alg == MBEDTLS_CIPHER_DES_CBC )
borlanic 0:fbdae7e6d805 384 ret = pem_des_decrypt( pem_iv, buf, len, pwd, pwdlen );
borlanic 0:fbdae7e6d805 385 #endif /* MBEDTLS_DES_C */
borlanic 0:fbdae7e6d805 386
borlanic 0:fbdae7e6d805 387 #if defined(MBEDTLS_AES_C)
borlanic 0:fbdae7e6d805 388 if( enc_alg == MBEDTLS_CIPHER_AES_128_CBC )
borlanic 0:fbdae7e6d805 389 ret = pem_aes_decrypt( pem_iv, 16, buf, len, pwd, pwdlen );
borlanic 0:fbdae7e6d805 390 else if( enc_alg == MBEDTLS_CIPHER_AES_192_CBC )
borlanic 0:fbdae7e6d805 391 ret = pem_aes_decrypt( pem_iv, 24, buf, len, pwd, pwdlen );
borlanic 0:fbdae7e6d805 392 else if( enc_alg == MBEDTLS_CIPHER_AES_256_CBC )
borlanic 0:fbdae7e6d805 393 ret = pem_aes_decrypt( pem_iv, 32, buf, len, pwd, pwdlen );
borlanic 0:fbdae7e6d805 394 #endif /* MBEDTLS_AES_C */
borlanic 0:fbdae7e6d805 395
borlanic 0:fbdae7e6d805 396 if( ret != 0 )
borlanic 0:fbdae7e6d805 397 {
borlanic 0:fbdae7e6d805 398 mbedtls_free( buf );
borlanic 0:fbdae7e6d805 399 return( ret );
borlanic 0:fbdae7e6d805 400 }
borlanic 0:fbdae7e6d805 401
borlanic 0:fbdae7e6d805 402 /*
borlanic 0:fbdae7e6d805 403 * The result will be ASN.1 starting with a SEQUENCE tag, with 1 to 3
borlanic 0:fbdae7e6d805 404 * length bytes (allow 4 to be sure) in all known use cases.
borlanic 0:fbdae7e6d805 405 *
borlanic 0:fbdae7e6d805 406 * Use that as heurisitic to try detecting password mismatchs.
borlanic 0:fbdae7e6d805 407 */
borlanic 0:fbdae7e6d805 408 if( len <= 2 || buf[0] != 0x30 || buf[1] > 0x83 )
borlanic 0:fbdae7e6d805 409 {
borlanic 0:fbdae7e6d805 410 mbedtls_zeroize( buf, len );
borlanic 0:fbdae7e6d805 411 mbedtls_free( buf );
borlanic 0:fbdae7e6d805 412 return( MBEDTLS_ERR_PEM_PASSWORD_MISMATCH );
borlanic 0:fbdae7e6d805 413 }
borlanic 0:fbdae7e6d805 414 #else
borlanic 0:fbdae7e6d805 415 mbedtls_zeroize( buf, len );
borlanic 0:fbdae7e6d805 416 mbedtls_free( buf );
borlanic 0:fbdae7e6d805 417 return( MBEDTLS_ERR_PEM_FEATURE_UNAVAILABLE );
borlanic 0:fbdae7e6d805 418 #endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
borlanic 0:fbdae7e6d805 419 ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
borlanic 0:fbdae7e6d805 420 }
borlanic 0:fbdae7e6d805 421
borlanic 0:fbdae7e6d805 422 ctx->buf = buf;
borlanic 0:fbdae7e6d805 423 ctx->buflen = len;
borlanic 0:fbdae7e6d805 424
borlanic 0:fbdae7e6d805 425 return( 0 );
borlanic 0:fbdae7e6d805 426 }
borlanic 0:fbdae7e6d805 427
borlanic 0:fbdae7e6d805 428 void mbedtls_pem_free( mbedtls_pem_context *ctx )
borlanic 0:fbdae7e6d805 429 {
borlanic 0:fbdae7e6d805 430 if( ctx->buf != NULL )
borlanic 0:fbdae7e6d805 431 mbedtls_zeroize( ctx->buf, ctx->buflen );
borlanic 0:fbdae7e6d805 432 mbedtls_free( ctx->buf );
borlanic 0:fbdae7e6d805 433 mbedtls_free( ctx->info );
borlanic 0:fbdae7e6d805 434
borlanic 0:fbdae7e6d805 435 mbedtls_zeroize( ctx, sizeof( mbedtls_pem_context ) );
borlanic 0:fbdae7e6d805 436 }
borlanic 0:fbdae7e6d805 437 #endif /* MBEDTLS_PEM_PARSE_C */
borlanic 0:fbdae7e6d805 438
borlanic 0:fbdae7e6d805 439 #if defined(MBEDTLS_PEM_WRITE_C)
borlanic 0:fbdae7e6d805 440 int mbedtls_pem_write_buffer( const char *header, const char *footer,
borlanic 0:fbdae7e6d805 441 const unsigned char *der_data, size_t der_len,
borlanic 0:fbdae7e6d805 442 unsigned char *buf, size_t buf_len, size_t *olen )
borlanic 0:fbdae7e6d805 443 {
borlanic 0:fbdae7e6d805 444 int ret;
borlanic 0:fbdae7e6d805 445 unsigned char *encode_buf, *c, *p = buf;
borlanic 0:fbdae7e6d805 446 size_t len = 0, use_len, add_len = 0;
borlanic 0:fbdae7e6d805 447
borlanic 0:fbdae7e6d805 448 mbedtls_base64_encode( NULL, 0, &use_len, der_data, der_len );
borlanic 0:fbdae7e6d805 449 add_len = strlen( header ) + strlen( footer ) + ( use_len / 64 ) + 1;
borlanic 0:fbdae7e6d805 450
borlanic 0:fbdae7e6d805 451 if( use_len + add_len > buf_len )
borlanic 0:fbdae7e6d805 452 {
borlanic 0:fbdae7e6d805 453 *olen = use_len + add_len;
borlanic 0:fbdae7e6d805 454 return( MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL );
borlanic 0:fbdae7e6d805 455 }
borlanic 0:fbdae7e6d805 456
borlanic 0:fbdae7e6d805 457 if( ( encode_buf = mbedtls_calloc( 1, use_len ) ) == NULL )
borlanic 0:fbdae7e6d805 458 return( MBEDTLS_ERR_PEM_ALLOC_FAILED );
borlanic 0:fbdae7e6d805 459
borlanic 0:fbdae7e6d805 460 if( ( ret = mbedtls_base64_encode( encode_buf, use_len, &use_len, der_data,
borlanic 0:fbdae7e6d805 461 der_len ) ) != 0 )
borlanic 0:fbdae7e6d805 462 {
borlanic 0:fbdae7e6d805 463 mbedtls_free( encode_buf );
borlanic 0:fbdae7e6d805 464 return( ret );
borlanic 0:fbdae7e6d805 465 }
borlanic 0:fbdae7e6d805 466
borlanic 0:fbdae7e6d805 467 memcpy( p, header, strlen( header ) );
borlanic 0:fbdae7e6d805 468 p += strlen( header );
borlanic 0:fbdae7e6d805 469 c = encode_buf;
borlanic 0:fbdae7e6d805 470
borlanic 0:fbdae7e6d805 471 while( use_len )
borlanic 0:fbdae7e6d805 472 {
borlanic 0:fbdae7e6d805 473 len = ( use_len > 64 ) ? 64 : use_len;
borlanic 0:fbdae7e6d805 474 memcpy( p, c, len );
borlanic 0:fbdae7e6d805 475 use_len -= len;
borlanic 0:fbdae7e6d805 476 p += len;
borlanic 0:fbdae7e6d805 477 c += len;
borlanic 0:fbdae7e6d805 478 *p++ = '\n';
borlanic 0:fbdae7e6d805 479 }
borlanic 0:fbdae7e6d805 480
borlanic 0:fbdae7e6d805 481 memcpy( p, footer, strlen( footer ) );
borlanic 0:fbdae7e6d805 482 p += strlen( footer );
borlanic 0:fbdae7e6d805 483
borlanic 0:fbdae7e6d805 484 *p++ = '\0';
borlanic 0:fbdae7e6d805 485 *olen = p - buf;
borlanic 0:fbdae7e6d805 486
borlanic 0:fbdae7e6d805 487 mbedtls_free( encode_buf );
borlanic 0:fbdae7e6d805 488 return( 0 );
borlanic 0:fbdae7e6d805 489 }
borlanic 0:fbdae7e6d805 490 #endif /* MBEDTLS_PEM_WRITE_C */
borlanic 0:fbdae7e6d805 491 #endif /* MBEDTLS_PEM_PARSE_C || MBEDTLS_PEM_WRITE_C */