Marco Zecchini / Mbed OS Example_RTOS

Rtos API example

mbed-os/features/mbedtls/src/pem.c@0:9fca2b23d0ba, 2019-02-23 (annotated)

Committer:
marcozecchini
Date:
Sat Feb 23 12:13:36 2019 +0000
Revision:
0:9fca2b23d0ba
final commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
marcozecchini 0:9fca2b23d0ba 1 /*
marcozecchini 0:9fca2b23d0ba 2 * Privacy Enhanced Mail (PEM) decoding
marcozecchini 0:9fca2b23d0ba 3 *
marcozecchini 0:9fca2b23d0ba 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
marcozecchini 0:9fca2b23d0ba 5 * SPDX-License-Identifier: Apache-2.0
marcozecchini 0:9fca2b23d0ba 6 *
marcozecchini 0:9fca2b23d0ba 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
marcozecchini 0:9fca2b23d0ba 8 * not use this file except in compliance with the License.
marcozecchini 0:9fca2b23d0ba 9 * You may obtain a copy of the License at
marcozecchini 0:9fca2b23d0ba 10 *
marcozecchini 0:9fca2b23d0ba 11 * http://www.apache.org/licenses/LICENSE-2.0
marcozecchini 0:9fca2b23d0ba 12 *
marcozecchini 0:9fca2b23d0ba 13 * Unless required by applicable law or agreed to in writing, software
marcozecchini 0:9fca2b23d0ba 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
marcozecchini 0:9fca2b23d0ba 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
marcozecchini 0:9fca2b23d0ba 16 * See the License for the specific language governing permissions and
marcozecchini 0:9fca2b23d0ba 17 * limitations under the License.
marcozecchini 0:9fca2b23d0ba 18 *
marcozecchini 0:9fca2b23d0ba 19 * This file is part of mbed TLS (https://tls.mbed.org)
marcozecchini 0:9fca2b23d0ba 20 */
marcozecchini 0:9fca2b23d0ba 21
marcozecchini 0:9fca2b23d0ba 22 #if !defined(MBEDTLS_CONFIG_FILE)
marcozecchini 0:9fca2b23d0ba 23 #include "mbedtls/config.h"
marcozecchini 0:9fca2b23d0ba 24 #else
marcozecchini 0:9fca2b23d0ba 25 #include MBEDTLS_CONFIG_FILE
marcozecchini 0:9fca2b23d0ba 26 #endif
marcozecchini 0:9fca2b23d0ba 27
marcozecchini 0:9fca2b23d0ba 28 #if defined(MBEDTLS_PEM_PARSE_C) || defined(MBEDTLS_PEM_WRITE_C)
marcozecchini 0:9fca2b23d0ba 29
marcozecchini 0:9fca2b23d0ba 30 #include "mbedtls/pem.h"
marcozecchini 0:9fca2b23d0ba 31 #include "mbedtls/base64.h"
marcozecchini 0:9fca2b23d0ba 32 #include "mbedtls/des.h"
marcozecchini 0:9fca2b23d0ba 33 #include "mbedtls/aes.h"
marcozecchini 0:9fca2b23d0ba 34 #include "mbedtls/md5.h"
marcozecchini 0:9fca2b23d0ba 35 #include "mbedtls/cipher.h"
marcozecchini 0:9fca2b23d0ba 36
marcozecchini 0:9fca2b23d0ba 37 #include <string.h>
marcozecchini 0:9fca2b23d0ba 38
marcozecchini 0:9fca2b23d0ba 39 #if defined(MBEDTLS_PLATFORM_C)
marcozecchini 0:9fca2b23d0ba 40 #include "mbedtls/platform.h"
marcozecchini 0:9fca2b23d0ba 41 #else
marcozecchini 0:9fca2b23d0ba 42 #include <stdlib.h>
marcozecchini 0:9fca2b23d0ba 43 #define mbedtls_calloc calloc
marcozecchini 0:9fca2b23d0ba 44 #define mbedtls_free free
marcozecchini 0:9fca2b23d0ba 45 #endif
marcozecchini 0:9fca2b23d0ba 46
marcozecchini 0:9fca2b23d0ba 47 #if defined(MBEDTLS_PEM_PARSE_C)
marcozecchini 0:9fca2b23d0ba 48 /* Implementation that should never be optimized out by the compiler */
marcozecchini 0:9fca2b23d0ba 49 static void mbedtls_zeroize( void *v, size_t n ) {
marcozecchini 0:9fca2b23d0ba 50 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
marcozecchini 0:9fca2b23d0ba 51 }
marcozecchini 0:9fca2b23d0ba 52
marcozecchini 0:9fca2b23d0ba 53 void mbedtls_pem_init( mbedtls_pem_context *ctx )
marcozecchini 0:9fca2b23d0ba 54 {
marcozecchini 0:9fca2b23d0ba 55 memset( ctx, 0, sizeof( mbedtls_pem_context ) );
marcozecchini 0:9fca2b23d0ba 56 }
marcozecchini 0:9fca2b23d0ba 57
marcozecchini 0:9fca2b23d0ba 58 #if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
marcozecchini 0:9fca2b23d0ba 59 ( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
marcozecchini 0:9fca2b23d0ba 60 /*
marcozecchini 0:9fca2b23d0ba 61 * Read a 16-byte hex string and convert it to binary
marcozecchini 0:9fca2b23d0ba 62 */
marcozecchini 0:9fca2b23d0ba 63 static int pem_get_iv( const unsigned char *s, unsigned char *iv,
marcozecchini 0:9fca2b23d0ba 64 size_t iv_len )
marcozecchini 0:9fca2b23d0ba 65 {
marcozecchini 0:9fca2b23d0ba 66 size_t i, j, k;
marcozecchini 0:9fca2b23d0ba 67
marcozecchini 0:9fca2b23d0ba 68 memset( iv, 0, iv_len );
marcozecchini 0:9fca2b23d0ba 69
marcozecchini 0:9fca2b23d0ba 70 for( i = 0; i < iv_len * 2; i++, s++ )
marcozecchini 0:9fca2b23d0ba 71 {
marcozecchini 0:9fca2b23d0ba 72 if( *s >= '0' && *s <= '9' ) j = *s - '0'; else
marcozecchini 0:9fca2b23d0ba 73 if( *s >= 'A' && *s <= 'F' ) j = *s - '7'; else
marcozecchini 0:9fca2b23d0ba 74 if( *s >= 'a' && *s <= 'f' ) j = *s - 'W'; else
marcozecchini 0:9fca2b23d0ba 75 return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
marcozecchini 0:9fca2b23d0ba 76
marcozecchini 0:9fca2b23d0ba 77 k = ( ( i & 1 ) != 0 ) ? j : j << 4;
marcozecchini 0:9fca2b23d0ba 78
marcozecchini 0:9fca2b23d0ba 79 iv[i >> 1] = (unsigned char)( iv[i >> 1] | k );
marcozecchini 0:9fca2b23d0ba 80 }
marcozecchini 0:9fca2b23d0ba 81
marcozecchini 0:9fca2b23d0ba 82 return( 0 );
marcozecchini 0:9fca2b23d0ba 83 }
marcozecchini 0:9fca2b23d0ba 84
marcozecchini 0:9fca2b23d0ba 85 static void pem_pbkdf1( unsigned char *key, size_t keylen,
marcozecchini 0:9fca2b23d0ba 86 unsigned char *iv,
marcozecchini 0:9fca2b23d0ba 87 const unsigned char *pwd, size_t pwdlen )
marcozecchini 0:9fca2b23d0ba 88 {
marcozecchini 0:9fca2b23d0ba 89 mbedtls_md5_context md5_ctx;
marcozecchini 0:9fca2b23d0ba 90 unsigned char md5sum[16];
marcozecchini 0:9fca2b23d0ba 91 size_t use_len;
marcozecchini 0:9fca2b23d0ba 92
marcozecchini 0:9fca2b23d0ba 93 mbedtls_md5_init( &md5_ctx );
marcozecchini 0:9fca2b23d0ba 94
marcozecchini 0:9fca2b23d0ba 95 /*
marcozecchini 0:9fca2b23d0ba 96 * key[ 0..15] = MD5(pwd || IV)
marcozecchini 0:9fca2b23d0ba 97 */
marcozecchini 0:9fca2b23d0ba 98 mbedtls_md5_starts( &md5_ctx );
marcozecchini 0:9fca2b23d0ba 99 mbedtls_md5_update( &md5_ctx, pwd, pwdlen );
marcozecchini 0:9fca2b23d0ba 100 mbedtls_md5_update( &md5_ctx, iv, 8 );
marcozecchini 0:9fca2b23d0ba 101 mbedtls_md5_finish( &md5_ctx, md5sum );
marcozecchini 0:9fca2b23d0ba 102
marcozecchini 0:9fca2b23d0ba 103 if( keylen <= 16 )
marcozecchini 0:9fca2b23d0ba 104 {
marcozecchini 0:9fca2b23d0ba 105 memcpy( key, md5sum, keylen );
marcozecchini 0:9fca2b23d0ba 106
marcozecchini 0:9fca2b23d0ba 107 mbedtls_md5_free( &md5_ctx );
marcozecchini 0:9fca2b23d0ba 108 mbedtls_zeroize( md5sum, 16 );
marcozecchini 0:9fca2b23d0ba 109 return;
marcozecchini 0:9fca2b23d0ba 110 }
marcozecchini 0:9fca2b23d0ba 111
marcozecchini 0:9fca2b23d0ba 112 memcpy( key, md5sum, 16 );
marcozecchini 0:9fca2b23d0ba 113
marcozecchini 0:9fca2b23d0ba 114 /*
marcozecchini 0:9fca2b23d0ba 115 * key[16..23] = MD5(key[ 0..15] || pwd || IV])
marcozecchini 0:9fca2b23d0ba 116 */
marcozecchini 0:9fca2b23d0ba 117 mbedtls_md5_starts( &md5_ctx );
marcozecchini 0:9fca2b23d0ba 118 mbedtls_md5_update( &md5_ctx, md5sum, 16 );
marcozecchini 0:9fca2b23d0ba 119 mbedtls_md5_update( &md5_ctx, pwd, pwdlen );
marcozecchini 0:9fca2b23d0ba 120 mbedtls_md5_update( &md5_ctx, iv, 8 );
marcozecchini 0:9fca2b23d0ba 121 mbedtls_md5_finish( &md5_ctx, md5sum );
marcozecchini 0:9fca2b23d0ba 122
marcozecchini 0:9fca2b23d0ba 123 use_len = 16;
marcozecchini 0:9fca2b23d0ba 124 if( keylen < 32 )
marcozecchini 0:9fca2b23d0ba 125 use_len = keylen - 16;
marcozecchini 0:9fca2b23d0ba 126
marcozecchini 0:9fca2b23d0ba 127 memcpy( key + 16, md5sum, use_len );
marcozecchini 0:9fca2b23d0ba 128
marcozecchini 0:9fca2b23d0ba 129 mbedtls_md5_free( &md5_ctx );
marcozecchini 0:9fca2b23d0ba 130 mbedtls_zeroize( md5sum, 16 );
marcozecchini 0:9fca2b23d0ba 131 }
marcozecchini 0:9fca2b23d0ba 132
marcozecchini 0:9fca2b23d0ba 133 #if defined(MBEDTLS_DES_C)
marcozecchini 0:9fca2b23d0ba 134 /*
marcozecchini 0:9fca2b23d0ba 135 * Decrypt with DES-CBC, using PBKDF1 for key derivation
marcozecchini 0:9fca2b23d0ba 136 */
marcozecchini 0:9fca2b23d0ba 137 static void pem_des_decrypt( unsigned char des_iv[8],
marcozecchini 0:9fca2b23d0ba 138 unsigned char *buf, size_t buflen,
marcozecchini 0:9fca2b23d0ba 139 const unsigned char *pwd, size_t pwdlen )
marcozecchini 0:9fca2b23d0ba 140 {
marcozecchini 0:9fca2b23d0ba 141 mbedtls_des_context des_ctx;
marcozecchini 0:9fca2b23d0ba 142 unsigned char des_key[8];
marcozecchini 0:9fca2b23d0ba 143
marcozecchini 0:9fca2b23d0ba 144 mbedtls_des_init( &des_ctx );
marcozecchini 0:9fca2b23d0ba 145
marcozecchini 0:9fca2b23d0ba 146 pem_pbkdf1( des_key, 8, des_iv, pwd, pwdlen );
marcozecchini 0:9fca2b23d0ba 147
marcozecchini 0:9fca2b23d0ba 148 mbedtls_des_setkey_dec( &des_ctx, des_key );
marcozecchini 0:9fca2b23d0ba 149 mbedtls_des_crypt_cbc( &des_ctx, MBEDTLS_DES_DECRYPT, buflen,
marcozecchini 0:9fca2b23d0ba 150 des_iv, buf, buf );
marcozecchini 0:9fca2b23d0ba 151
marcozecchini 0:9fca2b23d0ba 152 mbedtls_des_free( &des_ctx );
marcozecchini 0:9fca2b23d0ba 153 mbedtls_zeroize( des_key, 8 );
marcozecchini 0:9fca2b23d0ba 154 }
marcozecchini 0:9fca2b23d0ba 155
marcozecchini 0:9fca2b23d0ba 156 /*
marcozecchini 0:9fca2b23d0ba 157 * Decrypt with 3DES-CBC, using PBKDF1 for key derivation
marcozecchini 0:9fca2b23d0ba 158 */
marcozecchini 0:9fca2b23d0ba 159 static void pem_des3_decrypt( unsigned char des3_iv[8],
marcozecchini 0:9fca2b23d0ba 160 unsigned char *buf, size_t buflen,
marcozecchini 0:9fca2b23d0ba 161 const unsigned char *pwd, size_t pwdlen )
marcozecchini 0:9fca2b23d0ba 162 {
marcozecchini 0:9fca2b23d0ba 163 mbedtls_des3_context des3_ctx;
marcozecchini 0:9fca2b23d0ba 164 unsigned char des3_key[24];
marcozecchini 0:9fca2b23d0ba 165
marcozecchini 0:9fca2b23d0ba 166 mbedtls_des3_init( &des3_ctx );
marcozecchini 0:9fca2b23d0ba 167
marcozecchini 0:9fca2b23d0ba 168 pem_pbkdf1( des3_key, 24, des3_iv, pwd, pwdlen );
marcozecchini 0:9fca2b23d0ba 169
marcozecchini 0:9fca2b23d0ba 170 mbedtls_des3_set3key_dec( &des3_ctx, des3_key );
marcozecchini 0:9fca2b23d0ba 171 mbedtls_des3_crypt_cbc( &des3_ctx, MBEDTLS_DES_DECRYPT, buflen,
marcozecchini 0:9fca2b23d0ba 172 des3_iv, buf, buf );
marcozecchini 0:9fca2b23d0ba 173
marcozecchini 0:9fca2b23d0ba 174 mbedtls_des3_free( &des3_ctx );
marcozecchini 0:9fca2b23d0ba 175 mbedtls_zeroize( des3_key, 24 );
marcozecchini 0:9fca2b23d0ba 176 }
marcozecchini 0:9fca2b23d0ba 177 #endif /* MBEDTLS_DES_C */
marcozecchini 0:9fca2b23d0ba 178
marcozecchini 0:9fca2b23d0ba 179 #if defined(MBEDTLS_AES_C)
marcozecchini 0:9fca2b23d0ba 180 /*
marcozecchini 0:9fca2b23d0ba 181 * Decrypt with AES-XXX-CBC, using PBKDF1 for key derivation
marcozecchini 0:9fca2b23d0ba 182 */
marcozecchini 0:9fca2b23d0ba 183 static void pem_aes_decrypt( unsigned char aes_iv[16], unsigned int keylen,
marcozecchini 0:9fca2b23d0ba 184 unsigned char *buf, size_t buflen,
marcozecchini 0:9fca2b23d0ba 185 const unsigned char *pwd, size_t pwdlen )
marcozecchini 0:9fca2b23d0ba 186 {
marcozecchini 0:9fca2b23d0ba 187 mbedtls_aes_context aes_ctx;
marcozecchini 0:9fca2b23d0ba 188 unsigned char aes_key[32];
marcozecchini 0:9fca2b23d0ba 189
marcozecchini 0:9fca2b23d0ba 190 mbedtls_aes_init( &aes_ctx );
marcozecchini 0:9fca2b23d0ba 191
marcozecchini 0:9fca2b23d0ba 192 pem_pbkdf1( aes_key, keylen, aes_iv, pwd, pwdlen );
marcozecchini 0:9fca2b23d0ba 193
marcozecchini 0:9fca2b23d0ba 194 mbedtls_aes_setkey_dec( &aes_ctx, aes_key, keylen * 8 );
marcozecchini 0:9fca2b23d0ba 195 mbedtls_aes_crypt_cbc( &aes_ctx, MBEDTLS_AES_DECRYPT, buflen,
marcozecchini 0:9fca2b23d0ba 196 aes_iv, buf, buf );
marcozecchini 0:9fca2b23d0ba 197
marcozecchini 0:9fca2b23d0ba 198 mbedtls_aes_free( &aes_ctx );
marcozecchini 0:9fca2b23d0ba 199 mbedtls_zeroize( aes_key, keylen );
marcozecchini 0:9fca2b23d0ba 200 }
marcozecchini 0:9fca2b23d0ba 201 #endif /* MBEDTLS_AES_C */
marcozecchini 0:9fca2b23d0ba 202
marcozecchini 0:9fca2b23d0ba 203 #endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
marcozecchini 0:9fca2b23d0ba 204 ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
marcozecchini 0:9fca2b23d0ba 205
marcozecchini 0:9fca2b23d0ba 206 int mbedtls_pem_read_buffer( mbedtls_pem_context *ctx, const char *header, const char *footer,
marcozecchini 0:9fca2b23d0ba 207 const unsigned char *data, const unsigned char *pwd,
marcozecchini 0:9fca2b23d0ba 208 size_t pwdlen, size_t *use_len )
marcozecchini 0:9fca2b23d0ba 209 {
marcozecchini 0:9fca2b23d0ba 210 int ret, enc;
marcozecchini 0:9fca2b23d0ba 211 size_t len;
marcozecchini 0:9fca2b23d0ba 212 unsigned char *buf;
marcozecchini 0:9fca2b23d0ba 213 const unsigned char *s1, *s2, *end;
marcozecchini 0:9fca2b23d0ba 214 #if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
marcozecchini 0:9fca2b23d0ba 215 ( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
marcozecchini 0:9fca2b23d0ba 216 unsigned char pem_iv[16];
marcozecchini 0:9fca2b23d0ba 217 mbedtls_cipher_type_t enc_alg = MBEDTLS_CIPHER_NONE;
marcozecchini 0:9fca2b23d0ba 218 #else
marcozecchini 0:9fca2b23d0ba 219 ((void) pwd);
marcozecchini 0:9fca2b23d0ba 220 ((void) pwdlen);
marcozecchini 0:9fca2b23d0ba 221 #endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
marcozecchini 0:9fca2b23d0ba 222 ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
marcozecchini 0:9fca2b23d0ba 223
marcozecchini 0:9fca2b23d0ba 224 if( ctx == NULL )
marcozecchini 0:9fca2b23d0ba 225 return( MBEDTLS_ERR_PEM_BAD_INPUT_DATA );
marcozecchini 0:9fca2b23d0ba 226
marcozecchini 0:9fca2b23d0ba 227 s1 = (unsigned char *) strstr( (const char *) data, header );
marcozecchini 0:9fca2b23d0ba 228
marcozecchini 0:9fca2b23d0ba 229 if( s1 == NULL )
marcozecchini 0:9fca2b23d0ba 230 return( MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT );
marcozecchini 0:9fca2b23d0ba 231
marcozecchini 0:9fca2b23d0ba 232 s2 = (unsigned char *) strstr( (const char *) data, footer );
marcozecchini 0:9fca2b23d0ba 233
marcozecchini 0:9fca2b23d0ba 234 if( s2 == NULL || s2 <= s1 )
marcozecchini 0:9fca2b23d0ba 235 return( MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT );
marcozecchini 0:9fca2b23d0ba 236
marcozecchini 0:9fca2b23d0ba 237 s1 += strlen( header );
marcozecchini 0:9fca2b23d0ba 238 if( *s1 == ' ' ) s1++;
marcozecchini 0:9fca2b23d0ba 239 if( *s1 == '\r' ) s1++;
marcozecchini 0:9fca2b23d0ba 240 if( *s1 == '\n' ) s1++;
marcozecchini 0:9fca2b23d0ba 241 else return( MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT );
marcozecchini 0:9fca2b23d0ba 242
marcozecchini 0:9fca2b23d0ba 243 end = s2;
marcozecchini 0:9fca2b23d0ba 244 end += strlen( footer );
marcozecchini 0:9fca2b23d0ba 245 if( *end == ' ' ) end++;
marcozecchini 0:9fca2b23d0ba 246 if( *end == '\r' ) end++;
marcozecchini 0:9fca2b23d0ba 247 if( *end == '\n' ) end++;
marcozecchini 0:9fca2b23d0ba 248 *use_len = end - data;
marcozecchini 0:9fca2b23d0ba 249
marcozecchini 0:9fca2b23d0ba 250 enc = 0;
marcozecchini 0:9fca2b23d0ba 251
marcozecchini 0:9fca2b23d0ba 252 if( s2 - s1 >= 22 && memcmp( s1, "Proc-Type: 4,ENCRYPTED", 22 ) == 0 )
marcozecchini 0:9fca2b23d0ba 253 {
marcozecchini 0:9fca2b23d0ba 254 #if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
marcozecchini 0:9fca2b23d0ba 255 ( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
marcozecchini 0:9fca2b23d0ba 256 enc++;
marcozecchini 0:9fca2b23d0ba 257
marcozecchini 0:9fca2b23d0ba 258 s1 += 22;
marcozecchini 0:9fca2b23d0ba 259 if( *s1 == '\r' ) s1++;
marcozecchini 0:9fca2b23d0ba 260 if( *s1 == '\n' ) s1++;
marcozecchini 0:9fca2b23d0ba 261 else return( MBEDTLS_ERR_PEM_INVALID_DATA );
marcozecchini 0:9fca2b23d0ba 262
marcozecchini 0:9fca2b23d0ba 263
marcozecchini 0:9fca2b23d0ba 264 #if defined(MBEDTLS_DES_C)
marcozecchini 0:9fca2b23d0ba 265 if( s2 - s1 >= 23 && memcmp( s1, "DEK-Info: DES-EDE3-CBC,", 23 ) == 0 )
marcozecchini 0:9fca2b23d0ba 266 {
marcozecchini 0:9fca2b23d0ba 267 enc_alg = MBEDTLS_CIPHER_DES_EDE3_CBC;
marcozecchini 0:9fca2b23d0ba 268
marcozecchini 0:9fca2b23d0ba 269 s1 += 23;
marcozecchini 0:9fca2b23d0ba 270 if( s2 - s1 < 16 || pem_get_iv( s1, pem_iv, 8 ) != 0 )
marcozecchini 0:9fca2b23d0ba 271 return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
marcozecchini 0:9fca2b23d0ba 272
marcozecchini 0:9fca2b23d0ba 273 s1 += 16;
marcozecchini 0:9fca2b23d0ba 274 }
marcozecchini 0:9fca2b23d0ba 275 else if( s2 - s1 >= 18 && memcmp( s1, "DEK-Info: DES-CBC,", 18 ) == 0 )
marcozecchini 0:9fca2b23d0ba 276 {
marcozecchini 0:9fca2b23d0ba 277 enc_alg = MBEDTLS_CIPHER_DES_CBC;
marcozecchini 0:9fca2b23d0ba 278
marcozecchini 0:9fca2b23d0ba 279 s1 += 18;
marcozecchini 0:9fca2b23d0ba 280 if( s2 - s1 < 16 || pem_get_iv( s1, pem_iv, 8) != 0 )
marcozecchini 0:9fca2b23d0ba 281 return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
marcozecchini 0:9fca2b23d0ba 282
marcozecchini 0:9fca2b23d0ba 283 s1 += 16;
marcozecchini 0:9fca2b23d0ba 284 }
marcozecchini 0:9fca2b23d0ba 285 #endif /* MBEDTLS_DES_C */
marcozecchini 0:9fca2b23d0ba 286
marcozecchini 0:9fca2b23d0ba 287 #if defined(MBEDTLS_AES_C)
marcozecchini 0:9fca2b23d0ba 288 if( s2 - s1 >= 14 && memcmp( s1, "DEK-Info: AES-", 14 ) == 0 )
marcozecchini 0:9fca2b23d0ba 289 {
marcozecchini 0:9fca2b23d0ba 290 if( s2 - s1 < 22 )
marcozecchini 0:9fca2b23d0ba 291 return( MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG );
marcozecchini 0:9fca2b23d0ba 292 else if( memcmp( s1, "DEK-Info: AES-128-CBC,", 22 ) == 0 )
marcozecchini 0:9fca2b23d0ba 293 enc_alg = MBEDTLS_CIPHER_AES_128_CBC;
marcozecchini 0:9fca2b23d0ba 294 else if( memcmp( s1, "DEK-Info: AES-192-CBC,", 22 ) == 0 )
marcozecchini 0:9fca2b23d0ba 295 enc_alg = MBEDTLS_CIPHER_AES_192_CBC;
marcozecchini 0:9fca2b23d0ba 296 else if( memcmp( s1, "DEK-Info: AES-256-CBC,", 22 ) == 0 )
marcozecchini 0:9fca2b23d0ba 297 enc_alg = MBEDTLS_CIPHER_AES_256_CBC;
marcozecchini 0:9fca2b23d0ba 298 else
marcozecchini 0:9fca2b23d0ba 299 return( MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG );
marcozecchini 0:9fca2b23d0ba 300
marcozecchini 0:9fca2b23d0ba 301 s1 += 22;
marcozecchini 0:9fca2b23d0ba 302 if( s2 - s1 < 32 || pem_get_iv( s1, pem_iv, 16 ) != 0 )
marcozecchini 0:9fca2b23d0ba 303 return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
marcozecchini 0:9fca2b23d0ba 304
marcozecchini 0:9fca2b23d0ba 305 s1 += 32;
marcozecchini 0:9fca2b23d0ba 306 }
marcozecchini 0:9fca2b23d0ba 307 #endif /* MBEDTLS_AES_C */
marcozecchini 0:9fca2b23d0ba 308
marcozecchini 0:9fca2b23d0ba 309 if( enc_alg == MBEDTLS_CIPHER_NONE )
marcozecchini 0:9fca2b23d0ba 310 return( MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG );
marcozecchini 0:9fca2b23d0ba 311
marcozecchini 0:9fca2b23d0ba 312 if( *s1 == '\r' ) s1++;
marcozecchini 0:9fca2b23d0ba 313 if( *s1 == '\n' ) s1++;
marcozecchini 0:9fca2b23d0ba 314 else return( MBEDTLS_ERR_PEM_INVALID_DATA );
marcozecchini 0:9fca2b23d0ba 315 #else
marcozecchini 0:9fca2b23d0ba 316 return( MBEDTLS_ERR_PEM_FEATURE_UNAVAILABLE );
marcozecchini 0:9fca2b23d0ba 317 #endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
marcozecchini 0:9fca2b23d0ba 318 ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
marcozecchini 0:9fca2b23d0ba 319 }
marcozecchini 0:9fca2b23d0ba 320
marcozecchini 0:9fca2b23d0ba 321 if( s1 >= s2 )
marcozecchini 0:9fca2b23d0ba 322 return( MBEDTLS_ERR_PEM_INVALID_DATA );
marcozecchini 0:9fca2b23d0ba 323
marcozecchini 0:9fca2b23d0ba 324 ret = mbedtls_base64_decode( NULL, 0, &len, s1, s2 - s1 );
marcozecchini 0:9fca2b23d0ba 325
marcozecchini 0:9fca2b23d0ba 326 if( ret == MBEDTLS_ERR_BASE64_INVALID_CHARACTER )
marcozecchini 0:9fca2b23d0ba 327 return( MBEDTLS_ERR_PEM_INVALID_DATA + ret );
marcozecchini 0:9fca2b23d0ba 328
marcozecchini 0:9fca2b23d0ba 329 if( ( buf = mbedtls_calloc( 1, len ) ) == NULL )
marcozecchini 0:9fca2b23d0ba 330 return( MBEDTLS_ERR_PEM_ALLOC_FAILED );
marcozecchini 0:9fca2b23d0ba 331
marcozecchini 0:9fca2b23d0ba 332 if( ( ret = mbedtls_base64_decode( buf, len, &len, s1, s2 - s1 ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 333 {
marcozecchini 0:9fca2b23d0ba 334 mbedtls_free( buf );
marcozecchini 0:9fca2b23d0ba 335 return( MBEDTLS_ERR_PEM_INVALID_DATA + ret );
marcozecchini 0:9fca2b23d0ba 336 }
marcozecchini 0:9fca2b23d0ba 337
marcozecchini 0:9fca2b23d0ba 338 if( enc != 0 )
marcozecchini 0:9fca2b23d0ba 339 {
marcozecchini 0:9fca2b23d0ba 340 #if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
marcozecchini 0:9fca2b23d0ba 341 ( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
marcozecchini 0:9fca2b23d0ba 342 if( pwd == NULL )
marcozecchini 0:9fca2b23d0ba 343 {
marcozecchini 0:9fca2b23d0ba 344 mbedtls_free( buf );
marcozecchini 0:9fca2b23d0ba 345 return( MBEDTLS_ERR_PEM_PASSWORD_REQUIRED );
marcozecchini 0:9fca2b23d0ba 346 }
marcozecchini 0:9fca2b23d0ba 347
marcozecchini 0:9fca2b23d0ba 348 #if defined(MBEDTLS_DES_C)
marcozecchini 0:9fca2b23d0ba 349 if( enc_alg == MBEDTLS_CIPHER_DES_EDE3_CBC )
marcozecchini 0:9fca2b23d0ba 350 pem_des3_decrypt( pem_iv, buf, len, pwd, pwdlen );
marcozecchini 0:9fca2b23d0ba 351 else if( enc_alg == MBEDTLS_CIPHER_DES_CBC )
marcozecchini 0:9fca2b23d0ba 352 pem_des_decrypt( pem_iv, buf, len, pwd, pwdlen );
marcozecchini 0:9fca2b23d0ba 353 #endif /* MBEDTLS_DES_C */
marcozecchini 0:9fca2b23d0ba 354
marcozecchini 0:9fca2b23d0ba 355 #if defined(MBEDTLS_AES_C)
marcozecchini 0:9fca2b23d0ba 356 if( enc_alg == MBEDTLS_CIPHER_AES_128_CBC )
marcozecchini 0:9fca2b23d0ba 357 pem_aes_decrypt( pem_iv, 16, buf, len, pwd, pwdlen );
marcozecchini 0:9fca2b23d0ba 358 else if( enc_alg == MBEDTLS_CIPHER_AES_192_CBC )
marcozecchini 0:9fca2b23d0ba 359 pem_aes_decrypt( pem_iv, 24, buf, len, pwd, pwdlen );
marcozecchini 0:9fca2b23d0ba 360 else if( enc_alg == MBEDTLS_CIPHER_AES_256_CBC )
marcozecchini 0:9fca2b23d0ba 361 pem_aes_decrypt( pem_iv, 32, buf, len, pwd, pwdlen );
marcozecchini 0:9fca2b23d0ba 362 #endif /* MBEDTLS_AES_C */
marcozecchini 0:9fca2b23d0ba 363
marcozecchini 0:9fca2b23d0ba 364 /*
marcozecchini 0:9fca2b23d0ba 365 * The result will be ASN.1 starting with a SEQUENCE tag, with 1 to 3
marcozecchini 0:9fca2b23d0ba 366 * length bytes (allow 4 to be sure) in all known use cases.
marcozecchini 0:9fca2b23d0ba 367 *
marcozecchini 0:9fca2b23d0ba 368 * Use that as heurisitic to try detecting password mismatchs.
marcozecchini 0:9fca2b23d0ba 369 */
marcozecchini 0:9fca2b23d0ba 370 if( len <= 2 || buf[0] != 0x30 || buf[1] > 0x83 )
marcozecchini 0:9fca2b23d0ba 371 {
marcozecchini 0:9fca2b23d0ba 372 mbedtls_free( buf );
marcozecchini 0:9fca2b23d0ba 373 return( MBEDTLS_ERR_PEM_PASSWORD_MISMATCH );
marcozecchini 0:9fca2b23d0ba 374 }
marcozecchini 0:9fca2b23d0ba 375 #else
marcozecchini 0:9fca2b23d0ba 376 mbedtls_free( buf );
marcozecchini 0:9fca2b23d0ba 377 return( MBEDTLS_ERR_PEM_FEATURE_UNAVAILABLE );
marcozecchini 0:9fca2b23d0ba 378 #endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
marcozecchini 0:9fca2b23d0ba 379 ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
marcozecchini 0:9fca2b23d0ba 380 }
marcozecchini 0:9fca2b23d0ba 381
marcozecchini 0:9fca2b23d0ba 382 ctx->buf = buf;
marcozecchini 0:9fca2b23d0ba 383 ctx->buflen = len;
marcozecchini 0:9fca2b23d0ba 384
marcozecchini 0:9fca2b23d0ba 385 return( 0 );
marcozecchini 0:9fca2b23d0ba 386 }
marcozecchini 0:9fca2b23d0ba 387
marcozecchini 0:9fca2b23d0ba 388 void mbedtls_pem_free( mbedtls_pem_context *ctx )
marcozecchini 0:9fca2b23d0ba 389 {
marcozecchini 0:9fca2b23d0ba 390 mbedtls_free( ctx->buf );
marcozecchini 0:9fca2b23d0ba 391 mbedtls_free( ctx->info );
marcozecchini 0:9fca2b23d0ba 392
marcozecchini 0:9fca2b23d0ba 393 mbedtls_zeroize( ctx, sizeof( mbedtls_pem_context ) );
marcozecchini 0:9fca2b23d0ba 394 }
marcozecchini 0:9fca2b23d0ba 395 #endif /* MBEDTLS_PEM_PARSE_C */
marcozecchini 0:9fca2b23d0ba 396
marcozecchini 0:9fca2b23d0ba 397 #if defined(MBEDTLS_PEM_WRITE_C)
marcozecchini 0:9fca2b23d0ba 398 int mbedtls_pem_write_buffer( const char *header, const char *footer,
marcozecchini 0:9fca2b23d0ba 399 const unsigned char *der_data, size_t der_len,
marcozecchini 0:9fca2b23d0ba 400 unsigned char *buf, size_t buf_len, size_t *olen )
marcozecchini 0:9fca2b23d0ba 401 {
marcozecchini 0:9fca2b23d0ba 402 int ret;
marcozecchini 0:9fca2b23d0ba 403 unsigned char *encode_buf, *c, *p = buf;
marcozecchini 0:9fca2b23d0ba 404 size_t len = 0, use_len, add_len = 0;
marcozecchini 0:9fca2b23d0ba 405
marcozecchini 0:9fca2b23d0ba 406 mbedtls_base64_encode( NULL, 0, &use_len, der_data, der_len );
marcozecchini 0:9fca2b23d0ba 407 add_len = strlen( header ) + strlen( footer ) + ( use_len / 64 ) + 1;
marcozecchini 0:9fca2b23d0ba 408
marcozecchini 0:9fca2b23d0ba 409 if( use_len + add_len > buf_len )
marcozecchini 0:9fca2b23d0ba 410 {
marcozecchini 0:9fca2b23d0ba 411 *olen = use_len + add_len;
marcozecchini 0:9fca2b23d0ba 412 return( MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL );
marcozecchini 0:9fca2b23d0ba 413 }
marcozecchini 0:9fca2b23d0ba 414
marcozecchini 0:9fca2b23d0ba 415 if( ( encode_buf = mbedtls_calloc( 1, use_len ) ) == NULL )
marcozecchini 0:9fca2b23d0ba 416 return( MBEDTLS_ERR_PEM_ALLOC_FAILED );
marcozecchini 0:9fca2b23d0ba 417
marcozecchini 0:9fca2b23d0ba 418 if( ( ret = mbedtls_base64_encode( encode_buf, use_len, &use_len, der_data,
marcozecchini 0:9fca2b23d0ba 419 der_len ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 420 {
marcozecchini 0:9fca2b23d0ba 421 mbedtls_free( encode_buf );
marcozecchini 0:9fca2b23d0ba 422 return( ret );
marcozecchini 0:9fca2b23d0ba 423 }
marcozecchini 0:9fca2b23d0ba 424
marcozecchini 0:9fca2b23d0ba 425 memcpy( p, header, strlen( header ) );
marcozecchini 0:9fca2b23d0ba 426 p += strlen( header );
marcozecchini 0:9fca2b23d0ba 427 c = encode_buf;
marcozecchini 0:9fca2b23d0ba 428
marcozecchini 0:9fca2b23d0ba 429 while( use_len )
marcozecchini 0:9fca2b23d0ba 430 {
marcozecchini 0:9fca2b23d0ba 431 len = ( use_len > 64 ) ? 64 : use_len;
marcozecchini 0:9fca2b23d0ba 432 memcpy( p, c, len );
marcozecchini 0:9fca2b23d0ba 433 use_len -= len;
marcozecchini 0:9fca2b23d0ba 434 p += len;
marcozecchini 0:9fca2b23d0ba 435 c += len;
marcozecchini 0:9fca2b23d0ba 436 *p++ = '\n';
marcozecchini 0:9fca2b23d0ba 437 }
marcozecchini 0:9fca2b23d0ba 438
marcozecchini 0:9fca2b23d0ba 439 memcpy( p, footer, strlen( footer ) );
marcozecchini 0:9fca2b23d0ba 440 p += strlen( footer );
marcozecchini 0:9fca2b23d0ba 441
marcozecchini 0:9fca2b23d0ba 442 *p++ = '\0';
marcozecchini 0:9fca2b23d0ba 443 *olen = p - buf;
marcozecchini 0:9fca2b23d0ba 444
marcozecchini 0:9fca2b23d0ba 445 mbedtls_free( encode_buf );
marcozecchini 0:9fca2b23d0ba 446 return( 0 );
marcozecchini 0:9fca2b23d0ba 447 }
marcozecchini 0:9fca2b23d0ba 448 #endif /* MBEDTLS_PEM_WRITE_C */
marcozecchini 0:9fca2b23d0ba 449 #endif /* MBEDTLS_PEM_PARSE_C || MBEDTLS_PEM_WRITE_C */