Greg Steiert / pegasus_dev

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Dependents:   blinky_max32630fthr

features/mbedtls/src/pem.c@3:1198227e6421, 2016-12-16 (annotated)

Committer:
switches
Date:
Fri Dec 16 16:27:57 2016 +0000
Revision:
3:1198227e6421
Parent:
0:5c4d7b2438d3 
Changed ADC scale for MAX32625 platforms to 1.2V full scale to match MAX32630 platforms

Who changed what in which revision?

UserRevisionLine numberNew contents of line
switches 0:5c4d7b2438d3 1 /*
switches 0:5c4d7b2438d3 2 * Privacy Enhanced Mail (PEM) decoding
switches 0:5c4d7b2438d3 3 *
switches 0:5c4d7b2438d3 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
switches 0:5c4d7b2438d3 5 * SPDX-License-Identifier: Apache-2.0
switches 0:5c4d7b2438d3 6 *
switches 0:5c4d7b2438d3 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
switches 0:5c4d7b2438d3 8 * not use this file except in compliance with the License.
switches 0:5c4d7b2438d3 9 * You may obtain a copy of the License at
switches 0:5c4d7b2438d3 10 *
switches 0:5c4d7b2438d3 11 * http://www.apache.org/licenses/LICENSE-2.0
switches 0:5c4d7b2438d3 12 *
switches 0:5c4d7b2438d3 13 * Unless required by applicable law or agreed to in writing, software
switches 0:5c4d7b2438d3 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
switches 0:5c4d7b2438d3 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
switches 0:5c4d7b2438d3 16 * See the License for the specific language governing permissions and
switches 0:5c4d7b2438d3 17 * limitations under the License.
switches 0:5c4d7b2438d3 18 *
switches 0:5c4d7b2438d3 19 * This file is part of mbed TLS (https://tls.mbed.org)
switches 0:5c4d7b2438d3 20 */
switches 0:5c4d7b2438d3 21
switches 0:5c4d7b2438d3 22 #if !defined(MBEDTLS_CONFIG_FILE)
switches 0:5c4d7b2438d3 23 #include "mbedtls/config.h"
switches 0:5c4d7b2438d3 24 #else
switches 0:5c4d7b2438d3 25 #include MBEDTLS_CONFIG_FILE
switches 0:5c4d7b2438d3 26 #endif
switches 0:5c4d7b2438d3 27
switches 0:5c4d7b2438d3 28 #if defined(MBEDTLS_PEM_PARSE_C) || defined(MBEDTLS_PEM_WRITE_C)
switches 0:5c4d7b2438d3 29
switches 0:5c4d7b2438d3 30 #include "mbedtls/pem.h"
switches 0:5c4d7b2438d3 31 #include "mbedtls/base64.h"
switches 0:5c4d7b2438d3 32 #include "mbedtls/des.h"
switches 0:5c4d7b2438d3 33 #include "mbedtls/aes.h"
switches 0:5c4d7b2438d3 34 #include "mbedtls/md5.h"
switches 0:5c4d7b2438d3 35 #include "mbedtls/cipher.h"
switches 0:5c4d7b2438d3 36
switches 0:5c4d7b2438d3 37 #include <string.h>
switches 0:5c4d7b2438d3 38
switches 0:5c4d7b2438d3 39 #if defined(MBEDTLS_PLATFORM_C)
switches 0:5c4d7b2438d3 40 #include "mbedtls/platform.h"
switches 0:5c4d7b2438d3 41 #else
switches 0:5c4d7b2438d3 42 #include <stdlib.h>
switches 0:5c4d7b2438d3 43 #define mbedtls_calloc calloc
switches 0:5c4d7b2438d3 44 #define mbedtls_free free
switches 0:5c4d7b2438d3 45 #endif
switches 0:5c4d7b2438d3 46
switches 0:5c4d7b2438d3 47 /* Implementation that should never be optimized out by the compiler */
switches 0:5c4d7b2438d3 48 static void mbedtls_zeroize( void *v, size_t n ) {
switches 0:5c4d7b2438d3 49 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
switches 0:5c4d7b2438d3 50 }
switches 0:5c4d7b2438d3 51
switches 0:5c4d7b2438d3 52 #if defined(MBEDTLS_PEM_PARSE_C)
switches 0:5c4d7b2438d3 53 void mbedtls_pem_init( mbedtls_pem_context *ctx )
switches 0:5c4d7b2438d3 54 {
switches 0:5c4d7b2438d3 55 memset( ctx, 0, sizeof( mbedtls_pem_context ) );
switches 0:5c4d7b2438d3 56 }
switches 0:5c4d7b2438d3 57
switches 0:5c4d7b2438d3 58 #if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
switches 0:5c4d7b2438d3 59 ( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
switches 0:5c4d7b2438d3 60 /*
switches 0:5c4d7b2438d3 61 * Read a 16-byte hex string and convert it to binary
switches 0:5c4d7b2438d3 62 */
switches 0:5c4d7b2438d3 63 static int pem_get_iv( const unsigned char *s, unsigned char *iv,
switches 0:5c4d7b2438d3 64 size_t iv_len )
switches 0:5c4d7b2438d3 65 {
switches 0:5c4d7b2438d3 66 size_t i, j, k;
switches 0:5c4d7b2438d3 67
switches 0:5c4d7b2438d3 68 memset( iv, 0, iv_len );
switches 0:5c4d7b2438d3 69
switches 0:5c4d7b2438d3 70 for( i = 0; i < iv_len * 2; i++, s++ )
switches 0:5c4d7b2438d3 71 {
switches 0:5c4d7b2438d3 72 if( *s >= '0' && *s <= '9' ) j = *s - '0'; else
switches 0:5c4d7b2438d3 73 if( *s >= 'A' && *s <= 'F' ) j = *s - '7'; else
switches 0:5c4d7b2438d3 74 if( *s >= 'a' && *s <= 'f' ) j = *s - 'W'; else
switches 0:5c4d7b2438d3 75 return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
switches 0:5c4d7b2438d3 76
switches 0:5c4d7b2438d3 77 k = ( ( i & 1 ) != 0 ) ? j : j << 4;
switches 0:5c4d7b2438d3 78
switches 0:5c4d7b2438d3 79 iv[i >> 1] = (unsigned char)( iv[i >> 1] | k );
switches 0:5c4d7b2438d3 80 }
switches 0:5c4d7b2438d3 81
switches 0:5c4d7b2438d3 82 return( 0 );
switches 0:5c4d7b2438d3 83 }
switches 0:5c4d7b2438d3 84
switches 0:5c4d7b2438d3 85 static void pem_pbkdf1( unsigned char *key, size_t keylen,
switches 0:5c4d7b2438d3 86 unsigned char *iv,
switches 0:5c4d7b2438d3 87 const unsigned char *pwd, size_t pwdlen )
switches 0:5c4d7b2438d3 88 {
switches 0:5c4d7b2438d3 89 mbedtls_md5_context md5_ctx;
switches 0:5c4d7b2438d3 90 unsigned char md5sum[16];
switches 0:5c4d7b2438d3 91 size_t use_len;
switches 0:5c4d7b2438d3 92
switches 0:5c4d7b2438d3 93 mbedtls_md5_init( &md5_ctx );
switches 0:5c4d7b2438d3 94
switches 0:5c4d7b2438d3 95 /*
switches 0:5c4d7b2438d3 96 * key[ 0..15] = MD5(pwd || IV)
switches 0:5c4d7b2438d3 97 */
switches 0:5c4d7b2438d3 98 mbedtls_md5_starts( &md5_ctx );
switches 0:5c4d7b2438d3 99 mbedtls_md5_update( &md5_ctx, pwd, pwdlen );
switches 0:5c4d7b2438d3 100 mbedtls_md5_update( &md5_ctx, iv, 8 );
switches 0:5c4d7b2438d3 101 mbedtls_md5_finish( &md5_ctx, md5sum );
switches 0:5c4d7b2438d3 102
switches 0:5c4d7b2438d3 103 if( keylen <= 16 )
switches 0:5c4d7b2438d3 104 {
switches 0:5c4d7b2438d3 105 memcpy( key, md5sum, keylen );
switches 0:5c4d7b2438d3 106
switches 0:5c4d7b2438d3 107 mbedtls_md5_free( &md5_ctx );
switches 0:5c4d7b2438d3 108 mbedtls_zeroize( md5sum, 16 );
switches 0:5c4d7b2438d3 109 return;
switches 0:5c4d7b2438d3 110 }
switches 0:5c4d7b2438d3 111
switches 0:5c4d7b2438d3 112 memcpy( key, md5sum, 16 );
switches 0:5c4d7b2438d3 113
switches 0:5c4d7b2438d3 114 /*
switches 0:5c4d7b2438d3 115 * key[16..23] = MD5(key[ 0..15] || pwd || IV])
switches 0:5c4d7b2438d3 116 */
switches 0:5c4d7b2438d3 117 mbedtls_md5_starts( &md5_ctx );
switches 0:5c4d7b2438d3 118 mbedtls_md5_update( &md5_ctx, md5sum, 16 );
switches 0:5c4d7b2438d3 119 mbedtls_md5_update( &md5_ctx, pwd, pwdlen );
switches 0:5c4d7b2438d3 120 mbedtls_md5_update( &md5_ctx, iv, 8 );
switches 0:5c4d7b2438d3 121 mbedtls_md5_finish( &md5_ctx, md5sum );
switches 0:5c4d7b2438d3 122
switches 0:5c4d7b2438d3 123 use_len = 16;
switches 0:5c4d7b2438d3 124 if( keylen < 32 )
switches 0:5c4d7b2438d3 125 use_len = keylen - 16;
switches 0:5c4d7b2438d3 126
switches 0:5c4d7b2438d3 127 memcpy( key + 16, md5sum, use_len );
switches 0:5c4d7b2438d3 128
switches 0:5c4d7b2438d3 129 mbedtls_md5_free( &md5_ctx );
switches 0:5c4d7b2438d3 130 mbedtls_zeroize( md5sum, 16 );
switches 0:5c4d7b2438d3 131 }
switches 0:5c4d7b2438d3 132
switches 0:5c4d7b2438d3 133 #if defined(MBEDTLS_DES_C)
switches 0:5c4d7b2438d3 134 /*
switches 0:5c4d7b2438d3 135 * Decrypt with DES-CBC, using PBKDF1 for key derivation
switches 0:5c4d7b2438d3 136 */
switches 0:5c4d7b2438d3 137 static void pem_des_decrypt( unsigned char des_iv[8],
switches 0:5c4d7b2438d3 138 unsigned char *buf, size_t buflen,
switches 0:5c4d7b2438d3 139 const unsigned char *pwd, size_t pwdlen )
switches 0:5c4d7b2438d3 140 {
switches 0:5c4d7b2438d3 141 mbedtls_des_context des_ctx;
switches 0:5c4d7b2438d3 142 unsigned char des_key[8];
switches 0:5c4d7b2438d3 143
switches 0:5c4d7b2438d3 144 mbedtls_des_init( &des_ctx );
switches 0:5c4d7b2438d3 145
switches 0:5c4d7b2438d3 146 pem_pbkdf1( des_key, 8, des_iv, pwd, pwdlen );
switches 0:5c4d7b2438d3 147
switches 0:5c4d7b2438d3 148 mbedtls_des_setkey_dec( &des_ctx, des_key );
switches 0:5c4d7b2438d3 149 mbedtls_des_crypt_cbc( &des_ctx, MBEDTLS_DES_DECRYPT, buflen,
switches 0:5c4d7b2438d3 150 des_iv, buf, buf );
switches 0:5c4d7b2438d3 151
switches 0:5c4d7b2438d3 152 mbedtls_des_free( &des_ctx );
switches 0:5c4d7b2438d3 153 mbedtls_zeroize( des_key, 8 );
switches 0:5c4d7b2438d3 154 }
switches 0:5c4d7b2438d3 155
switches 0:5c4d7b2438d3 156 /*
switches 0:5c4d7b2438d3 157 * Decrypt with 3DES-CBC, using PBKDF1 for key derivation
switches 0:5c4d7b2438d3 158 */
switches 0:5c4d7b2438d3 159 static void pem_des3_decrypt( unsigned char des3_iv[8],
switches 0:5c4d7b2438d3 160 unsigned char *buf, size_t buflen,
switches 0:5c4d7b2438d3 161 const unsigned char *pwd, size_t pwdlen )
switches 0:5c4d7b2438d3 162 {
switches 0:5c4d7b2438d3 163 mbedtls_des3_context des3_ctx;
switches 0:5c4d7b2438d3 164 unsigned char des3_key[24];
switches 0:5c4d7b2438d3 165
switches 0:5c4d7b2438d3 166 mbedtls_des3_init( &des3_ctx );
switches 0:5c4d7b2438d3 167
switches 0:5c4d7b2438d3 168 pem_pbkdf1( des3_key, 24, des3_iv, pwd, pwdlen );
switches 0:5c4d7b2438d3 169
switches 0:5c4d7b2438d3 170 mbedtls_des3_set3key_dec( &des3_ctx, des3_key );
switches 0:5c4d7b2438d3 171 mbedtls_des3_crypt_cbc( &des3_ctx, MBEDTLS_DES_DECRYPT, buflen,
switches 0:5c4d7b2438d3 172 des3_iv, buf, buf );
switches 0:5c4d7b2438d3 173
switches 0:5c4d7b2438d3 174 mbedtls_des3_free( &des3_ctx );
switches 0:5c4d7b2438d3 175 mbedtls_zeroize( des3_key, 24 );
switches 0:5c4d7b2438d3 176 }
switches 0:5c4d7b2438d3 177 #endif /* MBEDTLS_DES_C */
switches 0:5c4d7b2438d3 178
switches 0:5c4d7b2438d3 179 #if defined(MBEDTLS_AES_C)
switches 0:5c4d7b2438d3 180 /*
switches 0:5c4d7b2438d3 181 * Decrypt with AES-XXX-CBC, using PBKDF1 for key derivation
switches 0:5c4d7b2438d3 182 */
switches 0:5c4d7b2438d3 183 static void pem_aes_decrypt( unsigned char aes_iv[16], unsigned int keylen,
switches 0:5c4d7b2438d3 184 unsigned char *buf, size_t buflen,
switches 0:5c4d7b2438d3 185 const unsigned char *pwd, size_t pwdlen )
switches 0:5c4d7b2438d3 186 {
switches 0:5c4d7b2438d3 187 mbedtls_aes_context aes_ctx;
switches 0:5c4d7b2438d3 188 unsigned char aes_key[32];
switches 0:5c4d7b2438d3 189
switches 0:5c4d7b2438d3 190 mbedtls_aes_init( &aes_ctx );
switches 0:5c4d7b2438d3 191
switches 0:5c4d7b2438d3 192 pem_pbkdf1( aes_key, keylen, aes_iv, pwd, pwdlen );
switches 0:5c4d7b2438d3 193
switches 0:5c4d7b2438d3 194 mbedtls_aes_setkey_dec( &aes_ctx, aes_key, keylen * 8 );
switches 0:5c4d7b2438d3 195 mbedtls_aes_crypt_cbc( &aes_ctx, MBEDTLS_AES_DECRYPT, buflen,
switches 0:5c4d7b2438d3 196 aes_iv, buf, buf );
switches 0:5c4d7b2438d3 197
switches 0:5c4d7b2438d3 198 mbedtls_aes_free( &aes_ctx );
switches 0:5c4d7b2438d3 199 mbedtls_zeroize( aes_key, keylen );
switches 0:5c4d7b2438d3 200 }
switches 0:5c4d7b2438d3 201 #endif /* MBEDTLS_AES_C */
switches 0:5c4d7b2438d3 202
switches 0:5c4d7b2438d3 203 #endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
switches 0:5c4d7b2438d3 204 ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
switches 0:5c4d7b2438d3 205
switches 0:5c4d7b2438d3 206 int mbedtls_pem_read_buffer( mbedtls_pem_context *ctx, const char *header, const char *footer,
switches 0:5c4d7b2438d3 207 const unsigned char *data, const unsigned char *pwd,
switches 0:5c4d7b2438d3 208 size_t pwdlen, size_t *use_len )
switches 0:5c4d7b2438d3 209 {
switches 0:5c4d7b2438d3 210 int ret, enc;
switches 0:5c4d7b2438d3 211 size_t len;
switches 0:5c4d7b2438d3 212 unsigned char *buf;
switches 0:5c4d7b2438d3 213 const unsigned char *s1, *s2, *end;
switches 0:5c4d7b2438d3 214 #if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
switches 0:5c4d7b2438d3 215 ( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
switches 0:5c4d7b2438d3 216 unsigned char pem_iv[16];
switches 0:5c4d7b2438d3 217 mbedtls_cipher_type_t enc_alg = MBEDTLS_CIPHER_NONE;
switches 0:5c4d7b2438d3 218 #else
switches 0:5c4d7b2438d3 219 ((void) pwd);
switches 0:5c4d7b2438d3 220 ((void) pwdlen);
switches 0:5c4d7b2438d3 221 #endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
switches 0:5c4d7b2438d3 222 ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
switches 0:5c4d7b2438d3 223
switches 0:5c4d7b2438d3 224 if( ctx == NULL )
switches 0:5c4d7b2438d3 225 return( MBEDTLS_ERR_PEM_BAD_INPUT_DATA );
switches 0:5c4d7b2438d3 226
switches 0:5c4d7b2438d3 227 s1 = (unsigned char *) strstr( (const char *) data, header );
switches 0:5c4d7b2438d3 228
switches 0:5c4d7b2438d3 229 if( s1 == NULL )
switches 0:5c4d7b2438d3 230 return( MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT );
switches 0:5c4d7b2438d3 231
switches 0:5c4d7b2438d3 232 s2 = (unsigned char *) strstr( (const char *) data, footer );
switches 0:5c4d7b2438d3 233
switches 0:5c4d7b2438d3 234 if( s2 == NULL || s2 <= s1 )
switches 0:5c4d7b2438d3 235 return( MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT );
switches 0:5c4d7b2438d3 236
switches 0:5c4d7b2438d3 237 s1 += strlen( header );
switches 0:5c4d7b2438d3 238 if( *s1 == ' ' ) s1++;
switches 0:5c4d7b2438d3 239 if( *s1 == '\r' ) s1++;
switches 0:5c4d7b2438d3 240 if( *s1 == '\n' ) s1++;
switches 0:5c4d7b2438d3 241 else return( MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT );
switches 0:5c4d7b2438d3 242
switches 0:5c4d7b2438d3 243 end = s2;
switches 0:5c4d7b2438d3 244 end += strlen( footer );
switches 0:5c4d7b2438d3 245 if( *end == ' ' ) end++;
switches 0:5c4d7b2438d3 246 if( *end == '\r' ) end++;
switches 0:5c4d7b2438d3 247 if( *end == '\n' ) end++;
switches 0:5c4d7b2438d3 248 *use_len = end - data;
switches 0:5c4d7b2438d3 249
switches 0:5c4d7b2438d3 250 enc = 0;
switches 0:5c4d7b2438d3 251
switches 0:5c4d7b2438d3 252 if( memcmp( s1, "Proc-Type: 4,ENCRYPTED", 22 ) == 0 )
switches 0:5c4d7b2438d3 253 {
switches 0:5c4d7b2438d3 254 #if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
switches 0:5c4d7b2438d3 255 ( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
switches 0:5c4d7b2438d3 256 enc++;
switches 0:5c4d7b2438d3 257
switches 0:5c4d7b2438d3 258 s1 += 22;
switches 0:5c4d7b2438d3 259 if( *s1 == '\r' ) s1++;
switches 0:5c4d7b2438d3 260 if( *s1 == '\n' ) s1++;
switches 0:5c4d7b2438d3 261 else return( MBEDTLS_ERR_PEM_INVALID_DATA );
switches 0:5c4d7b2438d3 262
switches 0:5c4d7b2438d3 263
switches 0:5c4d7b2438d3 264 #if defined(MBEDTLS_DES_C)
switches 0:5c4d7b2438d3 265 if( memcmp( s1, "DEK-Info: DES-EDE3-CBC,", 23 ) == 0 )
switches 0:5c4d7b2438d3 266 {
switches 0:5c4d7b2438d3 267 enc_alg = MBEDTLS_CIPHER_DES_EDE3_CBC;
switches 0:5c4d7b2438d3 268
switches 0:5c4d7b2438d3 269 s1 += 23;
switches 0:5c4d7b2438d3 270 if( pem_get_iv( s1, pem_iv, 8 ) != 0 )
switches 0:5c4d7b2438d3 271 return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
switches 0:5c4d7b2438d3 272
switches 0:5c4d7b2438d3 273 s1 += 16;
switches 0:5c4d7b2438d3 274 }
switches 0:5c4d7b2438d3 275 else if( memcmp( s1, "DEK-Info: DES-CBC,", 18 ) == 0 )
switches 0:5c4d7b2438d3 276 {
switches 0:5c4d7b2438d3 277 enc_alg = MBEDTLS_CIPHER_DES_CBC;
switches 0:5c4d7b2438d3 278
switches 0:5c4d7b2438d3 279 s1 += 18;
switches 0:5c4d7b2438d3 280 if( pem_get_iv( s1, pem_iv, 8) != 0 )
switches 0:5c4d7b2438d3 281 return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
switches 0:5c4d7b2438d3 282
switches 0:5c4d7b2438d3 283 s1 += 16;
switches 0:5c4d7b2438d3 284 }
switches 0:5c4d7b2438d3 285 #endif /* MBEDTLS_DES_C */
switches 0:5c4d7b2438d3 286
switches 0:5c4d7b2438d3 287 #if defined(MBEDTLS_AES_C)
switches 0:5c4d7b2438d3 288 if( memcmp( s1, "DEK-Info: AES-", 14 ) == 0 )
switches 0:5c4d7b2438d3 289 {
switches 0:5c4d7b2438d3 290 if( memcmp( s1, "DEK-Info: AES-128-CBC,", 22 ) == 0 )
switches 0:5c4d7b2438d3 291 enc_alg = MBEDTLS_CIPHER_AES_128_CBC;
switches 0:5c4d7b2438d3 292 else if( memcmp( s1, "DEK-Info: AES-192-CBC,", 22 ) == 0 )
switches 0:5c4d7b2438d3 293 enc_alg = MBEDTLS_CIPHER_AES_192_CBC;
switches 0:5c4d7b2438d3 294 else if( memcmp( s1, "DEK-Info: AES-256-CBC,", 22 ) == 0 )
switches 0:5c4d7b2438d3 295 enc_alg = MBEDTLS_CIPHER_AES_256_CBC;
switches 0:5c4d7b2438d3 296 else
switches 0:5c4d7b2438d3 297 return( MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG );
switches 0:5c4d7b2438d3 298
switches 0:5c4d7b2438d3 299 s1 += 22;
switches 0:5c4d7b2438d3 300 if( pem_get_iv( s1, pem_iv, 16 ) != 0 )
switches 0:5c4d7b2438d3 301 return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
switches 0:5c4d7b2438d3 302
switches 0:5c4d7b2438d3 303 s1 += 32;
switches 0:5c4d7b2438d3 304 }
switches 0:5c4d7b2438d3 305 #endif /* MBEDTLS_AES_C */
switches 0:5c4d7b2438d3 306
switches 0:5c4d7b2438d3 307 if( enc_alg == MBEDTLS_CIPHER_NONE )
switches 0:5c4d7b2438d3 308 return( MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG );
switches 0:5c4d7b2438d3 309
switches 0:5c4d7b2438d3 310 if( *s1 == '\r' ) s1++;
switches 0:5c4d7b2438d3 311 if( *s1 == '\n' ) s1++;
switches 0:5c4d7b2438d3 312 else return( MBEDTLS_ERR_PEM_INVALID_DATA );
switches 0:5c4d7b2438d3 313 #else
switches 0:5c4d7b2438d3 314 return( MBEDTLS_ERR_PEM_FEATURE_UNAVAILABLE );
switches 0:5c4d7b2438d3 315 #endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
switches 0:5c4d7b2438d3 316 ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
switches 0:5c4d7b2438d3 317 }
switches 0:5c4d7b2438d3 318
switches 0:5c4d7b2438d3 319 if( s1 == s2 )
switches 0:5c4d7b2438d3 320 return( MBEDTLS_ERR_PEM_INVALID_DATA );
switches 0:5c4d7b2438d3 321
switches 0:5c4d7b2438d3 322 ret = mbedtls_base64_decode( NULL, 0, &len, s1, s2 - s1 );
switches 0:5c4d7b2438d3 323
switches 0:5c4d7b2438d3 324 if( ret == MBEDTLS_ERR_BASE64_INVALID_CHARACTER )
switches 0:5c4d7b2438d3 325 return( MBEDTLS_ERR_PEM_INVALID_DATA + ret );
switches 0:5c4d7b2438d3 326
switches 0:5c4d7b2438d3 327 if( ( buf = mbedtls_calloc( 1, len ) ) == NULL )
switches 0:5c4d7b2438d3 328 return( MBEDTLS_ERR_PEM_ALLOC_FAILED );
switches 0:5c4d7b2438d3 329
switches 0:5c4d7b2438d3 330 if( ( ret = mbedtls_base64_decode( buf, len, &len, s1, s2 - s1 ) ) != 0 )
switches 0:5c4d7b2438d3 331 {
switches 0:5c4d7b2438d3 332 mbedtls_free( buf );
switches 0:5c4d7b2438d3 333 return( MBEDTLS_ERR_PEM_INVALID_DATA + ret );
switches 0:5c4d7b2438d3 334 }
switches 0:5c4d7b2438d3 335
switches 0:5c4d7b2438d3 336 if( enc != 0 )
switches 0:5c4d7b2438d3 337 {
switches 0:5c4d7b2438d3 338 #if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
switches 0:5c4d7b2438d3 339 ( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
switches 0:5c4d7b2438d3 340 if( pwd == NULL )
switches 0:5c4d7b2438d3 341 {
switches 0:5c4d7b2438d3 342 mbedtls_free( buf );
switches 0:5c4d7b2438d3 343 return( MBEDTLS_ERR_PEM_PASSWORD_REQUIRED );
switches 0:5c4d7b2438d3 344 }
switches 0:5c4d7b2438d3 345
switches 0:5c4d7b2438d3 346 #if defined(MBEDTLS_DES_C)
switches 0:5c4d7b2438d3 347 if( enc_alg == MBEDTLS_CIPHER_DES_EDE3_CBC )
switches 0:5c4d7b2438d3 348 pem_des3_decrypt( pem_iv, buf, len, pwd, pwdlen );
switches 0:5c4d7b2438d3 349 else if( enc_alg == MBEDTLS_CIPHER_DES_CBC )
switches 0:5c4d7b2438d3 350 pem_des_decrypt( pem_iv, buf, len, pwd, pwdlen );
switches 0:5c4d7b2438d3 351 #endif /* MBEDTLS_DES_C */
switches 0:5c4d7b2438d3 352
switches 0:5c4d7b2438d3 353 #if defined(MBEDTLS_AES_C)
switches 0:5c4d7b2438d3 354 if( enc_alg == MBEDTLS_CIPHER_AES_128_CBC )
switches 0:5c4d7b2438d3 355 pem_aes_decrypt( pem_iv, 16, buf, len, pwd, pwdlen );
switches 0:5c4d7b2438d3 356 else if( enc_alg == MBEDTLS_CIPHER_AES_192_CBC )
switches 0:5c4d7b2438d3 357 pem_aes_decrypt( pem_iv, 24, buf, len, pwd, pwdlen );
switches 0:5c4d7b2438d3 358 else if( enc_alg == MBEDTLS_CIPHER_AES_256_CBC )
switches 0:5c4d7b2438d3 359 pem_aes_decrypt( pem_iv, 32, buf, len, pwd, pwdlen );
switches 0:5c4d7b2438d3 360 #endif /* MBEDTLS_AES_C */
switches 0:5c4d7b2438d3 361
switches 0:5c4d7b2438d3 362 /*
switches 0:5c4d7b2438d3 363 * The result will be ASN.1 starting with a SEQUENCE tag, with 1 to 3
switches 0:5c4d7b2438d3 364 * length bytes (allow 4 to be sure) in all known use cases.
switches 0:5c4d7b2438d3 365 *
switches 0:5c4d7b2438d3 366 * Use that as heurisitic to try detecting password mismatchs.
switches 0:5c4d7b2438d3 367 */
switches 0:5c4d7b2438d3 368 if( len <= 2 || buf[0] != 0x30 || buf[1] > 0x83 )
switches 0:5c4d7b2438d3 369 {
switches 0:5c4d7b2438d3 370 mbedtls_free( buf );
switches 0:5c4d7b2438d3 371 return( MBEDTLS_ERR_PEM_PASSWORD_MISMATCH );
switches 0:5c4d7b2438d3 372 }
switches 0:5c4d7b2438d3 373 #else
switches 0:5c4d7b2438d3 374 mbedtls_free( buf );
switches 0:5c4d7b2438d3 375 return( MBEDTLS_ERR_PEM_FEATURE_UNAVAILABLE );
switches 0:5c4d7b2438d3 376 #endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
switches 0:5c4d7b2438d3 377 ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
switches 0:5c4d7b2438d3 378 }
switches 0:5c4d7b2438d3 379
switches 0:5c4d7b2438d3 380 ctx->buf = buf;
switches 0:5c4d7b2438d3 381 ctx->buflen = len;
switches 0:5c4d7b2438d3 382
switches 0:5c4d7b2438d3 383 return( 0 );
switches 0:5c4d7b2438d3 384 }
switches 0:5c4d7b2438d3 385
switches 0:5c4d7b2438d3 386 void mbedtls_pem_free( mbedtls_pem_context *ctx )
switches 0:5c4d7b2438d3 387 {
switches 0:5c4d7b2438d3 388 mbedtls_free( ctx->buf );
switches 0:5c4d7b2438d3 389 mbedtls_free( ctx->info );
switches 0:5c4d7b2438d3 390
switches 0:5c4d7b2438d3 391 mbedtls_zeroize( ctx, sizeof( mbedtls_pem_context ) );
switches 0:5c4d7b2438d3 392 }
switches 0:5c4d7b2438d3 393 #endif /* MBEDTLS_PEM_PARSE_C */
switches 0:5c4d7b2438d3 394
switches 0:5c4d7b2438d3 395 #if defined(MBEDTLS_PEM_WRITE_C)
switches 0:5c4d7b2438d3 396 int mbedtls_pem_write_buffer( const char *header, const char *footer,
switches 0:5c4d7b2438d3 397 const unsigned char *der_data, size_t der_len,
switches 0:5c4d7b2438d3 398 unsigned char *buf, size_t buf_len, size_t *olen )
switches 0:5c4d7b2438d3 399 {
switches 0:5c4d7b2438d3 400 int ret;
switches 0:5c4d7b2438d3 401 unsigned char *encode_buf, *c, *p = buf;
switches 0:5c4d7b2438d3 402 size_t len = 0, use_len, add_len = 0;
switches 0:5c4d7b2438d3 403
switches 0:5c4d7b2438d3 404 mbedtls_base64_encode( NULL, 0, &use_len, der_data, der_len );
switches 0:5c4d7b2438d3 405 add_len = strlen( header ) + strlen( footer ) + ( use_len / 64 ) + 1;
switches 0:5c4d7b2438d3 406
switches 0:5c4d7b2438d3 407 if( use_len + add_len > buf_len )
switches 0:5c4d7b2438d3 408 {
switches 0:5c4d7b2438d3 409 *olen = use_len + add_len;
switches 0:5c4d7b2438d3 410 return( MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL );
switches 0:5c4d7b2438d3 411 }
switches 0:5c4d7b2438d3 412
switches 0:5c4d7b2438d3 413 if( ( encode_buf = mbedtls_calloc( 1, use_len ) ) == NULL )
switches 0:5c4d7b2438d3 414 return( MBEDTLS_ERR_PEM_ALLOC_FAILED );
switches 0:5c4d7b2438d3 415
switches 0:5c4d7b2438d3 416 if( ( ret = mbedtls_base64_encode( encode_buf, use_len, &use_len, der_data,
switches 0:5c4d7b2438d3 417 der_len ) ) != 0 )
switches 0:5c4d7b2438d3 418 {
switches 0:5c4d7b2438d3 419 mbedtls_free( encode_buf );
switches 0:5c4d7b2438d3 420 return( ret );
switches 0:5c4d7b2438d3 421 }
switches 0:5c4d7b2438d3 422
switches 0:5c4d7b2438d3 423 memcpy( p, header, strlen( header ) );
switches 0:5c4d7b2438d3 424 p += strlen( header );
switches 0:5c4d7b2438d3 425 c = encode_buf;
switches 0:5c4d7b2438d3 426
switches 0:5c4d7b2438d3 427 while( use_len )
switches 0:5c4d7b2438d3 428 {
switches 0:5c4d7b2438d3 429 len = ( use_len > 64 ) ? 64 : use_len;
switches 0:5c4d7b2438d3 430 memcpy( p, c, len );
switches 0:5c4d7b2438d3 431 use_len -= len;
switches 0:5c4d7b2438d3 432 p += len;
switches 0:5c4d7b2438d3 433 c += len;
switches 0:5c4d7b2438d3 434 *p++ = '\n';
switches 0:5c4d7b2438d3 435 }
switches 0:5c4d7b2438d3 436
switches 0:5c4d7b2438d3 437 memcpy( p, footer, strlen( footer ) );
switches 0:5c4d7b2438d3 438 p += strlen( footer );
switches 0:5c4d7b2438d3 439
switches 0:5c4d7b2438d3 440 *p++ = '\0';
switches 0:5c4d7b2438d3 441 *olen = p - buf;
switches 0:5c4d7b2438d3 442
switches 0:5c4d7b2438d3 443 mbedtls_free( encode_buf );
switches 0:5c4d7b2438d3 444 return( 0 );
switches 0:5c4d7b2438d3 445 }
switches 0:5c4d7b2438d3 446 #endif /* MBEDTLS_PEM_WRITE_C */
switches 0:5c4d7b2438d3 447 #endif /* MBEDTLS_PEM_PARSE_C || MBEDTLS_PEM_WRITE_C */