Timothy Beight / Mbed 2 deprecated 6_songs-from-the-cloud

This is a fork due to permission issues

Dependencies:   mbed Socket lwip-eth lwip-sys lwip

Fork of 6_songs-from-the-cloud by MakingMusicWorkshop

mbed-client/mbedtls/source/pem.c@1:0ddbe2d3319c, 2016-05-19 (annotated)

Committer:
timbeight
Date:
Thu May 19 16:02:10 2016 +0000
Revision:
1:0ddbe2d3319c
Parent:
0:f7c60d3e7b8a 
This is my first commit while in the class.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
maclobdell 0:f7c60d3e7b8a 1 /*
maclobdell 0:f7c60d3e7b8a 2 * Privacy Enhanced Mail (PEM) decoding
maclobdell 0:f7c60d3e7b8a 3 *
maclobdell 0:f7c60d3e7b8a 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
maclobdell 0:f7c60d3e7b8a 5 * SPDX-License-Identifier: Apache-2.0
maclobdell 0:f7c60d3e7b8a 6 *
maclobdell 0:f7c60d3e7b8a 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
maclobdell 0:f7c60d3e7b8a 8 * not use this file except in compliance with the License.
maclobdell 0:f7c60d3e7b8a 9 * You may obtain a copy of the License at
maclobdell 0:f7c60d3e7b8a 10 *
maclobdell 0:f7c60d3e7b8a 11 * http://www.apache.org/licenses/LICENSE-2.0
maclobdell 0:f7c60d3e7b8a 12 *
maclobdell 0:f7c60d3e7b8a 13 * Unless required by applicable law or agreed to in writing, software
maclobdell 0:f7c60d3e7b8a 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
maclobdell 0:f7c60d3e7b8a 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
maclobdell 0:f7c60d3e7b8a 16 * See the License for the specific language governing permissions and
maclobdell 0:f7c60d3e7b8a 17 * limitations under the License.
maclobdell 0:f7c60d3e7b8a 18 *
maclobdell 0:f7c60d3e7b8a 19 * This file is part of mbed TLS (https://tls.mbed.org)
maclobdell 0:f7c60d3e7b8a 20 */
maclobdell 0:f7c60d3e7b8a 21
maclobdell 0:f7c60d3e7b8a 22 #if !defined(MBEDTLS_CONFIG_FILE)
maclobdell 0:f7c60d3e7b8a 23 #include "mbedtls/config.h"
maclobdell 0:f7c60d3e7b8a 24 #else
maclobdell 0:f7c60d3e7b8a 25 #include MBEDTLS_CONFIG_FILE
maclobdell 0:f7c60d3e7b8a 26 #endif
maclobdell 0:f7c60d3e7b8a 27
maclobdell 0:f7c60d3e7b8a 28 #if defined(MBEDTLS_PEM_PARSE_C) || defined(MBEDTLS_PEM_WRITE_C)
maclobdell 0:f7c60d3e7b8a 29
maclobdell 0:f7c60d3e7b8a 30 #include "mbedtls/pem.h"
maclobdell 0:f7c60d3e7b8a 31 #include "mbedtls/base64.h"
maclobdell 0:f7c60d3e7b8a 32 #include "mbedtls/des.h"
maclobdell 0:f7c60d3e7b8a 33 #include "mbedtls/aes.h"
maclobdell 0:f7c60d3e7b8a 34 #include "mbedtls/md5.h"
maclobdell 0:f7c60d3e7b8a 35 #include "mbedtls/cipher.h"
maclobdell 0:f7c60d3e7b8a 36
maclobdell 0:f7c60d3e7b8a 37 #include <string.h>
maclobdell 0:f7c60d3e7b8a 38
maclobdell 0:f7c60d3e7b8a 39 #if defined(MBEDTLS_PLATFORM_C)
maclobdell 0:f7c60d3e7b8a 40 #include "mbedtls/platform.h"
maclobdell 0:f7c60d3e7b8a 41 #else
maclobdell 0:f7c60d3e7b8a 42 #include <stdlib.h>
maclobdell 0:f7c60d3e7b8a 43 #define mbedtls_calloc calloc
maclobdell 0:f7c60d3e7b8a 44 #define mbedtls_free free
maclobdell 0:f7c60d3e7b8a 45 #endif
maclobdell 0:f7c60d3e7b8a 46
maclobdell 0:f7c60d3e7b8a 47 /* Implementation that should never be optimized out by the compiler */
maclobdell 0:f7c60d3e7b8a 48 static void mbedtls_zeroize( void *v, size_t n ) {
maclobdell 0:f7c60d3e7b8a 49 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
maclobdell 0:f7c60d3e7b8a 50 }
maclobdell 0:f7c60d3e7b8a 51
maclobdell 0:f7c60d3e7b8a 52 #if defined(MBEDTLS_PEM_PARSE_C)
maclobdell 0:f7c60d3e7b8a 53 void mbedtls_pem_init( mbedtls_pem_context *ctx )
maclobdell 0:f7c60d3e7b8a 54 {
maclobdell 0:f7c60d3e7b8a 55 memset( ctx, 0, sizeof( mbedtls_pem_context ) );
maclobdell 0:f7c60d3e7b8a 56 }
maclobdell 0:f7c60d3e7b8a 57
maclobdell 0:f7c60d3e7b8a 58 #if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
maclobdell 0:f7c60d3e7b8a 59 ( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
maclobdell 0:f7c60d3e7b8a 60 /*
maclobdell 0:f7c60d3e7b8a 61 * Read a 16-byte hex string and convert it to binary
maclobdell 0:f7c60d3e7b8a 62 */
maclobdell 0:f7c60d3e7b8a 63 static int pem_get_iv( const unsigned char *s, unsigned char *iv,
maclobdell 0:f7c60d3e7b8a 64 size_t iv_len )
maclobdell 0:f7c60d3e7b8a 65 {
maclobdell 0:f7c60d3e7b8a 66 size_t i, j, k;
maclobdell 0:f7c60d3e7b8a 67
maclobdell 0:f7c60d3e7b8a 68 memset( iv, 0, iv_len );
maclobdell 0:f7c60d3e7b8a 69
maclobdell 0:f7c60d3e7b8a 70 for( i = 0; i < iv_len * 2; i++, s++ )
maclobdell 0:f7c60d3e7b8a 71 {
maclobdell 0:f7c60d3e7b8a 72 if( *s >= '0' && *s <= '9' ) j = *s - '0'; else
maclobdell 0:f7c60d3e7b8a 73 if( *s >= 'A' && *s <= 'F' ) j = *s - '7'; else
maclobdell 0:f7c60d3e7b8a 74 if( *s >= 'a' && *s <= 'f' ) j = *s - 'W'; else
maclobdell 0:f7c60d3e7b8a 75 return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
maclobdell 0:f7c60d3e7b8a 76
maclobdell 0:f7c60d3e7b8a 77 k = ( ( i & 1 ) != 0 ) ? j : j << 4;
maclobdell 0:f7c60d3e7b8a 78
maclobdell 0:f7c60d3e7b8a 79 iv[i >> 1] = (unsigned char)( iv[i >> 1] | k );
maclobdell 0:f7c60d3e7b8a 80 }
maclobdell 0:f7c60d3e7b8a 81
maclobdell 0:f7c60d3e7b8a 82 return( 0 );
maclobdell 0:f7c60d3e7b8a 83 }
maclobdell 0:f7c60d3e7b8a 84
maclobdell 0:f7c60d3e7b8a 85 static void pem_pbkdf1( unsigned char *key, size_t keylen,
maclobdell 0:f7c60d3e7b8a 86 unsigned char *iv,
maclobdell 0:f7c60d3e7b8a 87 const unsigned char *pwd, size_t pwdlen )
maclobdell 0:f7c60d3e7b8a 88 {
maclobdell 0:f7c60d3e7b8a 89 mbedtls_md5_context md5_ctx;
maclobdell 0:f7c60d3e7b8a 90 unsigned char md5sum[16];
maclobdell 0:f7c60d3e7b8a 91 size_t use_len;
maclobdell 0:f7c60d3e7b8a 92
maclobdell 0:f7c60d3e7b8a 93 mbedtls_md5_init( &md5_ctx );
maclobdell 0:f7c60d3e7b8a 94
maclobdell 0:f7c60d3e7b8a 95 /*
maclobdell 0:f7c60d3e7b8a 96 * key[ 0..15] = MD5(pwd || IV)
maclobdell 0:f7c60d3e7b8a 97 */
maclobdell 0:f7c60d3e7b8a 98 mbedtls_md5_starts( &md5_ctx );
maclobdell 0:f7c60d3e7b8a 99 mbedtls_md5_update( &md5_ctx, pwd, pwdlen );
maclobdell 0:f7c60d3e7b8a 100 mbedtls_md5_update( &md5_ctx, iv, 8 );
maclobdell 0:f7c60d3e7b8a 101 mbedtls_md5_finish( &md5_ctx, md5sum );
maclobdell 0:f7c60d3e7b8a 102
maclobdell 0:f7c60d3e7b8a 103 if( keylen <= 16 )
maclobdell 0:f7c60d3e7b8a 104 {
maclobdell 0:f7c60d3e7b8a 105 memcpy( key, md5sum, keylen );
maclobdell 0:f7c60d3e7b8a 106
maclobdell 0:f7c60d3e7b8a 107 mbedtls_md5_free( &md5_ctx );
maclobdell 0:f7c60d3e7b8a 108 mbedtls_zeroize( md5sum, 16 );
maclobdell 0:f7c60d3e7b8a 109 return;
maclobdell 0:f7c60d3e7b8a 110 }
maclobdell 0:f7c60d3e7b8a 111
maclobdell 0:f7c60d3e7b8a 112 memcpy( key, md5sum, 16 );
maclobdell 0:f7c60d3e7b8a 113
maclobdell 0:f7c60d3e7b8a 114 /*
maclobdell 0:f7c60d3e7b8a 115 * key[16..23] = MD5(key[ 0..15] || pwd || IV])
maclobdell 0:f7c60d3e7b8a 116 */
maclobdell 0:f7c60d3e7b8a 117 mbedtls_md5_starts( &md5_ctx );
maclobdell 0:f7c60d3e7b8a 118 mbedtls_md5_update( &md5_ctx, md5sum, 16 );
maclobdell 0:f7c60d3e7b8a 119 mbedtls_md5_update( &md5_ctx, pwd, pwdlen );
maclobdell 0:f7c60d3e7b8a 120 mbedtls_md5_update( &md5_ctx, iv, 8 );
maclobdell 0:f7c60d3e7b8a 121 mbedtls_md5_finish( &md5_ctx, md5sum );
maclobdell 0:f7c60d3e7b8a 122
maclobdell 0:f7c60d3e7b8a 123 use_len = 16;
maclobdell 0:f7c60d3e7b8a 124 if( keylen < 32 )
maclobdell 0:f7c60d3e7b8a 125 use_len = keylen - 16;
maclobdell 0:f7c60d3e7b8a 126
maclobdell 0:f7c60d3e7b8a 127 memcpy( key + 16, md5sum, use_len );
maclobdell 0:f7c60d3e7b8a 128
maclobdell 0:f7c60d3e7b8a 129 mbedtls_md5_free( &md5_ctx );
maclobdell 0:f7c60d3e7b8a 130 mbedtls_zeroize( md5sum, 16 );
maclobdell 0:f7c60d3e7b8a 131 }
maclobdell 0:f7c60d3e7b8a 132
maclobdell 0:f7c60d3e7b8a 133 #if defined(MBEDTLS_DES_C)
maclobdell 0:f7c60d3e7b8a 134 /*
maclobdell 0:f7c60d3e7b8a 135 * Decrypt with DES-CBC, using PBKDF1 for key derivation
maclobdell 0:f7c60d3e7b8a 136 */
maclobdell 0:f7c60d3e7b8a 137 static void pem_des_decrypt( unsigned char des_iv[8],
maclobdell 0:f7c60d3e7b8a 138 unsigned char *buf, size_t buflen,
maclobdell 0:f7c60d3e7b8a 139 const unsigned char *pwd, size_t pwdlen )
maclobdell 0:f7c60d3e7b8a 140 {
maclobdell 0:f7c60d3e7b8a 141 mbedtls_des_context des_ctx;
maclobdell 0:f7c60d3e7b8a 142 unsigned char des_key[8];
maclobdell 0:f7c60d3e7b8a 143
maclobdell 0:f7c60d3e7b8a 144 mbedtls_des_init( &des_ctx );
maclobdell 0:f7c60d3e7b8a 145
maclobdell 0:f7c60d3e7b8a 146 pem_pbkdf1( des_key, 8, des_iv, pwd, pwdlen );
maclobdell 0:f7c60d3e7b8a 147
maclobdell 0:f7c60d3e7b8a 148 mbedtls_des_setkey_dec( &des_ctx, des_key );
maclobdell 0:f7c60d3e7b8a 149 mbedtls_des_crypt_cbc( &des_ctx, MBEDTLS_DES_DECRYPT, buflen,
maclobdell 0:f7c60d3e7b8a 150 des_iv, buf, buf );
maclobdell 0:f7c60d3e7b8a 151
maclobdell 0:f7c60d3e7b8a 152 mbedtls_des_free( &des_ctx );
maclobdell 0:f7c60d3e7b8a 153 mbedtls_zeroize( des_key, 8 );
maclobdell 0:f7c60d3e7b8a 154 }
maclobdell 0:f7c60d3e7b8a 155
maclobdell 0:f7c60d3e7b8a 156 /*
maclobdell 0:f7c60d3e7b8a 157 * Decrypt with 3DES-CBC, using PBKDF1 for key derivation
maclobdell 0:f7c60d3e7b8a 158 */
maclobdell 0:f7c60d3e7b8a 159 static void pem_des3_decrypt( unsigned char des3_iv[8],
maclobdell 0:f7c60d3e7b8a 160 unsigned char *buf, size_t buflen,
maclobdell 0:f7c60d3e7b8a 161 const unsigned char *pwd, size_t pwdlen )
maclobdell 0:f7c60d3e7b8a 162 {
maclobdell 0:f7c60d3e7b8a 163 mbedtls_des3_context des3_ctx;
maclobdell 0:f7c60d3e7b8a 164 unsigned char des3_key[24];
maclobdell 0:f7c60d3e7b8a 165
maclobdell 0:f7c60d3e7b8a 166 mbedtls_des3_init( &des3_ctx );
maclobdell 0:f7c60d3e7b8a 167
maclobdell 0:f7c60d3e7b8a 168 pem_pbkdf1( des3_key, 24, des3_iv, pwd, pwdlen );
maclobdell 0:f7c60d3e7b8a 169
maclobdell 0:f7c60d3e7b8a 170 mbedtls_des3_set3key_dec( &des3_ctx, des3_key );
maclobdell 0:f7c60d3e7b8a 171 mbedtls_des3_crypt_cbc( &des3_ctx, MBEDTLS_DES_DECRYPT, buflen,
maclobdell 0:f7c60d3e7b8a 172 des3_iv, buf, buf );
maclobdell 0:f7c60d3e7b8a 173
maclobdell 0:f7c60d3e7b8a 174 mbedtls_des3_free( &des3_ctx );
maclobdell 0:f7c60d3e7b8a 175 mbedtls_zeroize( des3_key, 24 );
maclobdell 0:f7c60d3e7b8a 176 }
maclobdell 0:f7c60d3e7b8a 177 #endif /* MBEDTLS_DES_C */
maclobdell 0:f7c60d3e7b8a 178
maclobdell 0:f7c60d3e7b8a 179 #if defined(MBEDTLS_AES_C)
maclobdell 0:f7c60d3e7b8a 180 /*
maclobdell 0:f7c60d3e7b8a 181 * Decrypt with AES-XXX-CBC, using PBKDF1 for key derivation
maclobdell 0:f7c60d3e7b8a 182 */
maclobdell 0:f7c60d3e7b8a 183 static void pem_aes_decrypt( unsigned char aes_iv[16], unsigned int keylen,
maclobdell 0:f7c60d3e7b8a 184 unsigned char *buf, size_t buflen,
maclobdell 0:f7c60d3e7b8a 185 const unsigned char *pwd, size_t pwdlen )
maclobdell 0:f7c60d3e7b8a 186 {
maclobdell 0:f7c60d3e7b8a 187 mbedtls_aes_context aes_ctx;
maclobdell 0:f7c60d3e7b8a 188 unsigned char aes_key[32];
maclobdell 0:f7c60d3e7b8a 189
maclobdell 0:f7c60d3e7b8a 190 mbedtls_aes_init( &aes_ctx );
maclobdell 0:f7c60d3e7b8a 191
maclobdell 0:f7c60d3e7b8a 192 pem_pbkdf1( aes_key, keylen, aes_iv, pwd, pwdlen );
maclobdell 0:f7c60d3e7b8a 193
maclobdell 0:f7c60d3e7b8a 194 mbedtls_aes_setkey_dec( &aes_ctx, aes_key, keylen * 8 );
maclobdell 0:f7c60d3e7b8a 195 mbedtls_aes_crypt_cbc( &aes_ctx, MBEDTLS_AES_DECRYPT, buflen,
maclobdell 0:f7c60d3e7b8a 196 aes_iv, buf, buf );
maclobdell 0:f7c60d3e7b8a 197
maclobdell 0:f7c60d3e7b8a 198 mbedtls_aes_free( &aes_ctx );
maclobdell 0:f7c60d3e7b8a 199 mbedtls_zeroize( aes_key, keylen );
maclobdell 0:f7c60d3e7b8a 200 }
maclobdell 0:f7c60d3e7b8a 201 #endif /* MBEDTLS_AES_C */
maclobdell 0:f7c60d3e7b8a 202
maclobdell 0:f7c60d3e7b8a 203 #endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
maclobdell 0:f7c60d3e7b8a 204 ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
maclobdell 0:f7c60d3e7b8a 205
maclobdell 0:f7c60d3e7b8a 206 int mbedtls_pem_read_buffer( mbedtls_pem_context *ctx, const char *header, const char *footer,
maclobdell 0:f7c60d3e7b8a 207 const unsigned char *data, const unsigned char *pwd,
maclobdell 0:f7c60d3e7b8a 208 size_t pwdlen, size_t *use_len )
maclobdell 0:f7c60d3e7b8a 209 {
maclobdell 0:f7c60d3e7b8a 210 int ret, enc;
maclobdell 0:f7c60d3e7b8a 211 size_t len;
maclobdell 0:f7c60d3e7b8a 212 unsigned char *buf;
maclobdell 0:f7c60d3e7b8a 213 const unsigned char *s1, *s2, *end;
maclobdell 0:f7c60d3e7b8a 214 #if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
maclobdell 0:f7c60d3e7b8a 215 ( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
maclobdell 0:f7c60d3e7b8a 216 unsigned char pem_iv[16];
maclobdell 0:f7c60d3e7b8a 217 mbedtls_cipher_type_t enc_alg = MBEDTLS_CIPHER_NONE;
maclobdell 0:f7c60d3e7b8a 218 #else
maclobdell 0:f7c60d3e7b8a 219 ((void) pwd);
maclobdell 0:f7c60d3e7b8a 220 ((void) pwdlen);
maclobdell 0:f7c60d3e7b8a 221 #endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
maclobdell 0:f7c60d3e7b8a 222 ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
maclobdell 0:f7c60d3e7b8a 223
maclobdell 0:f7c60d3e7b8a 224 if( ctx == NULL )
maclobdell 0:f7c60d3e7b8a 225 return( MBEDTLS_ERR_PEM_BAD_INPUT_DATA );
maclobdell 0:f7c60d3e7b8a 226
maclobdell 0:f7c60d3e7b8a 227 s1 = (unsigned char *) strstr( (const char *) data, header );
maclobdell 0:f7c60d3e7b8a 228
maclobdell 0:f7c60d3e7b8a 229 if( s1 == NULL )
maclobdell 0:f7c60d3e7b8a 230 return( MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT );
maclobdell 0:f7c60d3e7b8a 231
maclobdell 0:f7c60d3e7b8a 232 s2 = (unsigned char *) strstr( (const char *) data, footer );
maclobdell 0:f7c60d3e7b8a 233
maclobdell 0:f7c60d3e7b8a 234 if( s2 == NULL || s2 <= s1 )
maclobdell 0:f7c60d3e7b8a 235 return( MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT );
maclobdell 0:f7c60d3e7b8a 236
maclobdell 0:f7c60d3e7b8a 237 s1 += strlen( header );
maclobdell 0:f7c60d3e7b8a 238 if( *s1 == ' ' ) s1++;
maclobdell 0:f7c60d3e7b8a 239 if( *s1 == '\r' ) s1++;
maclobdell 0:f7c60d3e7b8a 240 if( *s1 == '\n' ) s1++;
maclobdell 0:f7c60d3e7b8a 241 else return( MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT );
maclobdell 0:f7c60d3e7b8a 242
maclobdell 0:f7c60d3e7b8a 243 end = s2;
maclobdell 0:f7c60d3e7b8a 244 end += strlen( footer );
maclobdell 0:f7c60d3e7b8a 245 if( *end == ' ' ) end++;
maclobdell 0:f7c60d3e7b8a 246 if( *end == '\r' ) end++;
maclobdell 0:f7c60d3e7b8a 247 if( *end == '\n' ) end++;
maclobdell 0:f7c60d3e7b8a 248 *use_len = end - data;
maclobdell 0:f7c60d3e7b8a 249
maclobdell 0:f7c60d3e7b8a 250 enc = 0;
maclobdell 0:f7c60d3e7b8a 251
maclobdell 0:f7c60d3e7b8a 252 if( memcmp( s1, "Proc-Type: 4,ENCRYPTED", 22 ) == 0 )
maclobdell 0:f7c60d3e7b8a 253 {
maclobdell 0:f7c60d3e7b8a 254 #if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
maclobdell 0:f7c60d3e7b8a 255 ( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
maclobdell 0:f7c60d3e7b8a 256 enc++;
maclobdell 0:f7c60d3e7b8a 257
maclobdell 0:f7c60d3e7b8a 258 s1 += 22;
maclobdell 0:f7c60d3e7b8a 259 if( *s1 == '\r' ) s1++;
maclobdell 0:f7c60d3e7b8a 260 if( *s1 == '\n' ) s1++;
maclobdell 0:f7c60d3e7b8a 261 else return( MBEDTLS_ERR_PEM_INVALID_DATA );
maclobdell 0:f7c60d3e7b8a 262
maclobdell 0:f7c60d3e7b8a 263
maclobdell 0:f7c60d3e7b8a 264 #if defined(MBEDTLS_DES_C)
maclobdell 0:f7c60d3e7b8a 265 if( memcmp( s1, "DEK-Info: DES-EDE3-CBC,", 23 ) == 0 )
maclobdell 0:f7c60d3e7b8a 266 {
maclobdell 0:f7c60d3e7b8a 267 enc_alg = MBEDTLS_CIPHER_DES_EDE3_CBC;
maclobdell 0:f7c60d3e7b8a 268
maclobdell 0:f7c60d3e7b8a 269 s1 += 23;
maclobdell 0:f7c60d3e7b8a 270 if( pem_get_iv( s1, pem_iv, 8 ) != 0 )
maclobdell 0:f7c60d3e7b8a 271 return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
maclobdell 0:f7c60d3e7b8a 272
maclobdell 0:f7c60d3e7b8a 273 s1 += 16;
maclobdell 0:f7c60d3e7b8a 274 }
maclobdell 0:f7c60d3e7b8a 275 else if( memcmp( s1, "DEK-Info: DES-CBC,", 18 ) == 0 )
maclobdell 0:f7c60d3e7b8a 276 {
maclobdell 0:f7c60d3e7b8a 277 enc_alg = MBEDTLS_CIPHER_DES_CBC;
maclobdell 0:f7c60d3e7b8a 278
maclobdell 0:f7c60d3e7b8a 279 s1 += 18;
maclobdell 0:f7c60d3e7b8a 280 if( pem_get_iv( s1, pem_iv, 8) != 0 )
maclobdell 0:f7c60d3e7b8a 281 return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
maclobdell 0:f7c60d3e7b8a 282
maclobdell 0:f7c60d3e7b8a 283 s1 += 16;
maclobdell 0:f7c60d3e7b8a 284 }
maclobdell 0:f7c60d3e7b8a 285 #endif /* MBEDTLS_DES_C */
maclobdell 0:f7c60d3e7b8a 286
maclobdell 0:f7c60d3e7b8a 287 #if defined(MBEDTLS_AES_C)
maclobdell 0:f7c60d3e7b8a 288 if( memcmp( s1, "DEK-Info: AES-", 14 ) == 0 )
maclobdell 0:f7c60d3e7b8a 289 {
maclobdell 0:f7c60d3e7b8a 290 if( memcmp( s1, "DEK-Info: AES-128-CBC,", 22 ) == 0 )
maclobdell 0:f7c60d3e7b8a 291 enc_alg = MBEDTLS_CIPHER_AES_128_CBC;
maclobdell 0:f7c60d3e7b8a 292 else if( memcmp( s1, "DEK-Info: AES-192-CBC,", 22 ) == 0 )
maclobdell 0:f7c60d3e7b8a 293 enc_alg = MBEDTLS_CIPHER_AES_192_CBC;
maclobdell 0:f7c60d3e7b8a 294 else if( memcmp( s1, "DEK-Info: AES-256-CBC,", 22 ) == 0 )
maclobdell 0:f7c60d3e7b8a 295 enc_alg = MBEDTLS_CIPHER_AES_256_CBC;
maclobdell 0:f7c60d3e7b8a 296 else
maclobdell 0:f7c60d3e7b8a 297 return( MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG );
maclobdell 0:f7c60d3e7b8a 298
maclobdell 0:f7c60d3e7b8a 299 s1 += 22;
maclobdell 0:f7c60d3e7b8a 300 if( pem_get_iv( s1, pem_iv, 16 ) != 0 )
maclobdell 0:f7c60d3e7b8a 301 return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
maclobdell 0:f7c60d3e7b8a 302
maclobdell 0:f7c60d3e7b8a 303 s1 += 32;
maclobdell 0:f7c60d3e7b8a 304 }
maclobdell 0:f7c60d3e7b8a 305 #endif /* MBEDTLS_AES_C */
maclobdell 0:f7c60d3e7b8a 306
maclobdell 0:f7c60d3e7b8a 307 if( enc_alg == MBEDTLS_CIPHER_NONE )
maclobdell 0:f7c60d3e7b8a 308 return( MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG );
maclobdell 0:f7c60d3e7b8a 309
maclobdell 0:f7c60d3e7b8a 310 if( *s1 == '\r' ) s1++;
maclobdell 0:f7c60d3e7b8a 311 if( *s1 == '\n' ) s1++;
maclobdell 0:f7c60d3e7b8a 312 else return( MBEDTLS_ERR_PEM_INVALID_DATA );
maclobdell 0:f7c60d3e7b8a 313 #else
maclobdell 0:f7c60d3e7b8a 314 return( MBEDTLS_ERR_PEM_FEATURE_UNAVAILABLE );
maclobdell 0:f7c60d3e7b8a 315 #endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
maclobdell 0:f7c60d3e7b8a 316 ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
maclobdell 0:f7c60d3e7b8a 317 }
maclobdell 0:f7c60d3e7b8a 318
maclobdell 0:f7c60d3e7b8a 319 if( s1 == s2 )
maclobdell 0:f7c60d3e7b8a 320 return( MBEDTLS_ERR_PEM_INVALID_DATA );
maclobdell 0:f7c60d3e7b8a 321
maclobdell 0:f7c60d3e7b8a 322 ret = mbedtls_base64_decode( NULL, 0, &len, s1, s2 - s1 );
maclobdell 0:f7c60d3e7b8a 323
maclobdell 0:f7c60d3e7b8a 324 if( ret == MBEDTLS_ERR_BASE64_INVALID_CHARACTER )
maclobdell 0:f7c60d3e7b8a 325 return( MBEDTLS_ERR_PEM_INVALID_DATA + ret );
maclobdell 0:f7c60d3e7b8a 326
maclobdell 0:f7c60d3e7b8a 327 if( ( buf = mbedtls_calloc( 1, len ) ) == NULL )
maclobdell 0:f7c60d3e7b8a 328 return( MBEDTLS_ERR_PEM_ALLOC_FAILED );
maclobdell 0:f7c60d3e7b8a 329
maclobdell 0:f7c60d3e7b8a 330 if( ( ret = mbedtls_base64_decode( buf, len, &len, s1, s2 - s1 ) ) != 0 )
maclobdell 0:f7c60d3e7b8a 331 {
maclobdell 0:f7c60d3e7b8a 332 mbedtls_free( buf );
maclobdell 0:f7c60d3e7b8a 333 return( MBEDTLS_ERR_PEM_INVALID_DATA + ret );
maclobdell 0:f7c60d3e7b8a 334 }
maclobdell 0:f7c60d3e7b8a 335
maclobdell 0:f7c60d3e7b8a 336 if( enc != 0 )
maclobdell 0:f7c60d3e7b8a 337 {
maclobdell 0:f7c60d3e7b8a 338 #if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
maclobdell 0:f7c60d3e7b8a 339 ( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
maclobdell 0:f7c60d3e7b8a 340 if( pwd == NULL )
maclobdell 0:f7c60d3e7b8a 341 {
maclobdell 0:f7c60d3e7b8a 342 mbedtls_free( buf );
maclobdell 0:f7c60d3e7b8a 343 return( MBEDTLS_ERR_PEM_PASSWORD_REQUIRED );
maclobdell 0:f7c60d3e7b8a 344 }
maclobdell 0:f7c60d3e7b8a 345
maclobdell 0:f7c60d3e7b8a 346 #if defined(MBEDTLS_DES_C)
maclobdell 0:f7c60d3e7b8a 347 if( enc_alg == MBEDTLS_CIPHER_DES_EDE3_CBC )
maclobdell 0:f7c60d3e7b8a 348 pem_des3_decrypt( pem_iv, buf, len, pwd, pwdlen );
maclobdell 0:f7c60d3e7b8a 349 else if( enc_alg == MBEDTLS_CIPHER_DES_CBC )
maclobdell 0:f7c60d3e7b8a 350 pem_des_decrypt( pem_iv, buf, len, pwd, pwdlen );
maclobdell 0:f7c60d3e7b8a 351 #endif /* MBEDTLS_DES_C */
maclobdell 0:f7c60d3e7b8a 352
maclobdell 0:f7c60d3e7b8a 353 #if defined(MBEDTLS_AES_C)
maclobdell 0:f7c60d3e7b8a 354 if( enc_alg == MBEDTLS_CIPHER_AES_128_CBC )
maclobdell 0:f7c60d3e7b8a 355 pem_aes_decrypt( pem_iv, 16, buf, len, pwd, pwdlen );
maclobdell 0:f7c60d3e7b8a 356 else if( enc_alg == MBEDTLS_CIPHER_AES_192_CBC )
maclobdell 0:f7c60d3e7b8a 357 pem_aes_decrypt( pem_iv, 24, buf, len, pwd, pwdlen );
maclobdell 0:f7c60d3e7b8a 358 else if( enc_alg == MBEDTLS_CIPHER_AES_256_CBC )
maclobdell 0:f7c60d3e7b8a 359 pem_aes_decrypt( pem_iv, 32, buf, len, pwd, pwdlen );
maclobdell 0:f7c60d3e7b8a 360 #endif /* MBEDTLS_AES_C */
maclobdell 0:f7c60d3e7b8a 361
maclobdell 0:f7c60d3e7b8a 362 /*
maclobdell 0:f7c60d3e7b8a 363 * The result will be ASN.1 starting with a SEQUENCE tag, with 1 to 3
maclobdell 0:f7c60d3e7b8a 364 * length bytes (allow 4 to be sure) in all known use cases.
maclobdell 0:f7c60d3e7b8a 365 *
maclobdell 0:f7c60d3e7b8a 366 * Use that as heurisitic to try detecting password mismatchs.
maclobdell 0:f7c60d3e7b8a 367 */
maclobdell 0:f7c60d3e7b8a 368 if( len <= 2 || buf[0] != 0x30 || buf[1] > 0x83 )
maclobdell 0:f7c60d3e7b8a 369 {
maclobdell 0:f7c60d3e7b8a 370 mbedtls_free( buf );
maclobdell 0:f7c60d3e7b8a 371 return( MBEDTLS_ERR_PEM_PASSWORD_MISMATCH );
maclobdell 0:f7c60d3e7b8a 372 }
maclobdell 0:f7c60d3e7b8a 373 #else
maclobdell 0:f7c60d3e7b8a 374 mbedtls_free( buf );
maclobdell 0:f7c60d3e7b8a 375 return( MBEDTLS_ERR_PEM_FEATURE_UNAVAILABLE );
maclobdell 0:f7c60d3e7b8a 376 #endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
maclobdell 0:f7c60d3e7b8a 377 ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
maclobdell 0:f7c60d3e7b8a 378 }
maclobdell 0:f7c60d3e7b8a 379
maclobdell 0:f7c60d3e7b8a 380 ctx->buf = buf;
maclobdell 0:f7c60d3e7b8a 381 ctx->buflen = len;
maclobdell 0:f7c60d3e7b8a 382
maclobdell 0:f7c60d3e7b8a 383 return( 0 );
maclobdell 0:f7c60d3e7b8a 384 }
maclobdell 0:f7c60d3e7b8a 385
maclobdell 0:f7c60d3e7b8a 386 void mbedtls_pem_free( mbedtls_pem_context *ctx )
maclobdell 0:f7c60d3e7b8a 387 {
maclobdell 0:f7c60d3e7b8a 388 mbedtls_free( ctx->buf );
maclobdell 0:f7c60d3e7b8a 389 mbedtls_free( ctx->info );
maclobdell 0:f7c60d3e7b8a 390
maclobdell 0:f7c60d3e7b8a 391 mbedtls_zeroize( ctx, sizeof( mbedtls_pem_context ) );
maclobdell 0:f7c60d3e7b8a 392 }
maclobdell 0:f7c60d3e7b8a 393 #endif /* MBEDTLS_PEM_PARSE_C */
maclobdell 0:f7c60d3e7b8a 394
maclobdell 0:f7c60d3e7b8a 395 #if defined(MBEDTLS_PEM_WRITE_C)
maclobdell 0:f7c60d3e7b8a 396 int mbedtls_pem_write_buffer( const char *header, const char *footer,
maclobdell 0:f7c60d3e7b8a 397 const unsigned char *der_data, size_t der_len,
maclobdell 0:f7c60d3e7b8a 398 unsigned char *buf, size_t buf_len, size_t *olen )
maclobdell 0:f7c60d3e7b8a 399 {
maclobdell 0:f7c60d3e7b8a 400 int ret;
maclobdell 0:f7c60d3e7b8a 401 unsigned char *encode_buf, *c, *p = buf;
maclobdell 0:f7c60d3e7b8a 402 size_t len = 0, use_len, add_len = 0;
maclobdell 0:f7c60d3e7b8a 403
maclobdell 0:f7c60d3e7b8a 404 mbedtls_base64_encode( NULL, 0, &use_len, der_data, der_len );
maclobdell 0:f7c60d3e7b8a 405 add_len = strlen( header ) + strlen( footer ) + ( use_len / 64 ) + 1;
maclobdell 0:f7c60d3e7b8a 406
maclobdell 0:f7c60d3e7b8a 407 if( use_len + add_len > buf_len )
maclobdell 0:f7c60d3e7b8a 408 {
maclobdell 0:f7c60d3e7b8a 409 *olen = use_len + add_len;
maclobdell 0:f7c60d3e7b8a 410 return( MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL );
maclobdell 0:f7c60d3e7b8a 411 }
maclobdell 0:f7c60d3e7b8a 412
maclobdell 0:f7c60d3e7b8a 413 if( ( encode_buf = mbedtls_calloc( 1, use_len ) ) == NULL )
maclobdell 0:f7c60d3e7b8a 414 return( MBEDTLS_ERR_PEM_ALLOC_FAILED );
maclobdell 0:f7c60d3e7b8a 415
maclobdell 0:f7c60d3e7b8a 416 if( ( ret = mbedtls_base64_encode( encode_buf, use_len, &use_len, der_data,
maclobdell 0:f7c60d3e7b8a 417 der_len ) ) != 0 )
maclobdell 0:f7c60d3e7b8a 418 {
maclobdell 0:f7c60d3e7b8a 419 mbedtls_free( encode_buf );
maclobdell 0:f7c60d3e7b8a 420 return( ret );
maclobdell 0:f7c60d3e7b8a 421 }
maclobdell 0:f7c60d3e7b8a 422
maclobdell 0:f7c60d3e7b8a 423 memcpy( p, header, strlen( header ) );
maclobdell 0:f7c60d3e7b8a 424 p += strlen( header );
maclobdell 0:f7c60d3e7b8a 425 c = encode_buf;
maclobdell 0:f7c60d3e7b8a 426
maclobdell 0:f7c60d3e7b8a 427 while( use_len )
maclobdell 0:f7c60d3e7b8a 428 {
maclobdell 0:f7c60d3e7b8a 429 len = ( use_len > 64 ) ? 64 : use_len;
maclobdell 0:f7c60d3e7b8a 430 memcpy( p, c, len );
maclobdell 0:f7c60d3e7b8a 431 use_len -= len;
maclobdell 0:f7c60d3e7b8a 432 p += len;
maclobdell 0:f7c60d3e7b8a 433 c += len;
maclobdell 0:f7c60d3e7b8a 434 *p++ = '\n';
maclobdell 0:f7c60d3e7b8a 435 }
maclobdell 0:f7c60d3e7b8a 436
maclobdell 0:f7c60d3e7b8a 437 memcpy( p, footer, strlen( footer ) );
maclobdell 0:f7c60d3e7b8a 438 p += strlen( footer );
maclobdell 0:f7c60d3e7b8a 439
maclobdell 0:f7c60d3e7b8a 440 *p++ = '\0';
maclobdell 0:f7c60d3e7b8a 441 *olen = p - buf;
maclobdell 0:f7c60d3e7b8a 442
maclobdell 0:f7c60d3e7b8a 443 mbedtls_free( encode_buf );
maclobdell 0:f7c60d3e7b8a 444 return( 0 );
maclobdell 0:f7c60d3e7b8a 445 }
maclobdell 0:f7c60d3e7b8a 446 #endif /* MBEDTLS_PEM_WRITE_C */
maclobdell 0:f7c60d3e7b8a 447 #endif /* MBEDTLS_PEM_PARSE_C || MBEDTLS_PEM_WRITE_C */