Nathen Gallardojohnson / WNCInterface

I added functionality to get the RSSI, BER, and Cell Neighbor for reporting connection issues to M2X

Dependencies:   WncControllerK64F

mbedtls/source/pem.c@16:8a4105d407d3, 2016-11-14 (annotated)

Committer:
JMF
Date:
Mon Nov 14 21:15:42 2016 +0000
Revision:
16:8a4105d407d3
Parent:
12:0071cb144c7a 
updated to ensure it builds with TLS by correcting config defaults.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
JMF 12:0071cb144c7a 1 /*
JMF 12:0071cb144c7a 2 * Privacy Enhanced Mail (PEM) decoding
JMF 12:0071cb144c7a 3 *
JMF 12:0071cb144c7a 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
JMF 12:0071cb144c7a 5 * SPDX-License-Identifier: Apache-2.0
JMF 12:0071cb144c7a 6 *
JMF 12:0071cb144c7a 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
JMF 12:0071cb144c7a 8 * not use this file except in compliance with the License.
JMF 12:0071cb144c7a 9 * You may obtain a copy of the License at
JMF 12:0071cb144c7a 10 *
JMF 12:0071cb144c7a 11 * http://www.apache.org/licenses/LICENSE-2.0
JMF 12:0071cb144c7a 12 *
JMF 12:0071cb144c7a 13 * Unless required by applicable law or agreed to in writing, software
JMF 12:0071cb144c7a 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
JMF 12:0071cb144c7a 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
JMF 12:0071cb144c7a 16 * See the License for the specific language governing permissions and
JMF 12:0071cb144c7a 17 * limitations under the License.
JMF 12:0071cb144c7a 18 *
JMF 12:0071cb144c7a 19 * This file is part of mbed TLS (https://tls.mbed.org)
JMF 12:0071cb144c7a 20 */
JMF 12:0071cb144c7a 21
JMF 12:0071cb144c7a 22 #if !defined(MBEDTLS_CONFIG_FILE)
JMF 12:0071cb144c7a 23 #include "mbedtls/config.h"
JMF 12:0071cb144c7a 24 #else
JMF 12:0071cb144c7a 25 #include MBEDTLS_CONFIG_FILE
JMF 12:0071cb144c7a 26 #endif
JMF 12:0071cb144c7a 27
JMF 12:0071cb144c7a 28 #if defined(MBEDTLS_PEM_PARSE_C) || defined(MBEDTLS_PEM_WRITE_C)
JMF 12:0071cb144c7a 29
JMF 12:0071cb144c7a 30 #include "mbedtls/pem.h"
JMF 12:0071cb144c7a 31 #include "mbedtls/base64.h"
JMF 12:0071cb144c7a 32 #include "mbedtls/des.h"
JMF 12:0071cb144c7a 33 #include "mbedtls/aes.h"
JMF 12:0071cb144c7a 34 #include "mbedtls/md5.h"
JMF 12:0071cb144c7a 35 #include "mbedtls/cipher.h"
JMF 12:0071cb144c7a 36
JMF 12:0071cb144c7a 37 #include <string.h>
JMF 12:0071cb144c7a 38
JMF 12:0071cb144c7a 39 #if defined(MBEDTLS_PLATFORM_C)
JMF 12:0071cb144c7a 40 #include "mbedtls/platform.h"
JMF 12:0071cb144c7a 41 #else
JMF 12:0071cb144c7a 42 #include <stdlib.h>
JMF 12:0071cb144c7a 43 #define mbedtls_calloc calloc
JMF 12:0071cb144c7a 44 #define mbedtls_free free
JMF 12:0071cb144c7a 45 #endif
JMF 12:0071cb144c7a 46
JMF 12:0071cb144c7a 47 /* Implementation that should never be optimized out by the compiler */
JMF 12:0071cb144c7a 48 static void mbedtls_zeroize( void *v, size_t n ) {
JMF 12:0071cb144c7a 49 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
JMF 12:0071cb144c7a 50 }
JMF 12:0071cb144c7a 51
JMF 12:0071cb144c7a 52 #if defined(MBEDTLS_PEM_PARSE_C)
JMF 12:0071cb144c7a 53 void mbedtls_pem_init( mbedtls_pem_context *ctx )
JMF 12:0071cb144c7a 54 {
JMF 12:0071cb144c7a 55 memset( ctx, 0, sizeof( mbedtls_pem_context ) );
JMF 12:0071cb144c7a 56 }
JMF 12:0071cb144c7a 57
JMF 12:0071cb144c7a 58 #if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
JMF 12:0071cb144c7a 59 ( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
JMF 12:0071cb144c7a 60 /*
JMF 12:0071cb144c7a 61 * Read a 16-byte hex string and convert it to binary
JMF 12:0071cb144c7a 62 */
JMF 12:0071cb144c7a 63 static int pem_get_iv( const unsigned char *s, unsigned char *iv,
JMF 12:0071cb144c7a 64 size_t iv_len )
JMF 12:0071cb144c7a 65 {
JMF 12:0071cb144c7a 66 size_t i, j, k;
JMF 12:0071cb144c7a 67
JMF 12:0071cb144c7a 68 memset( iv, 0, iv_len );
JMF 12:0071cb144c7a 69
JMF 12:0071cb144c7a 70 for( i = 0; i < iv_len * 2; i++, s++ )
JMF 12:0071cb144c7a 71 {
JMF 12:0071cb144c7a 72 if( *s >= '0' && *s <= '9' ) j = *s - '0'; else
JMF 12:0071cb144c7a 73 if( *s >= 'A' && *s <= 'F' ) j = *s - '7'; else
JMF 12:0071cb144c7a 74 if( *s >= 'a' && *s <= 'f' ) j = *s - 'W'; else
JMF 12:0071cb144c7a 75 return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
JMF 12:0071cb144c7a 76
JMF 12:0071cb144c7a 77 k = ( ( i & 1 ) != 0 ) ? j : j << 4;
JMF 12:0071cb144c7a 78
JMF 12:0071cb144c7a 79 iv[i >> 1] = (unsigned char)( iv[i >> 1] | k );
JMF 12:0071cb144c7a 80 }
JMF 12:0071cb144c7a 81
JMF 12:0071cb144c7a 82 return( 0 );
JMF 12:0071cb144c7a 83 }
JMF 12:0071cb144c7a 84
JMF 12:0071cb144c7a 85 static void pem_pbkdf1( unsigned char *key, size_t keylen,
JMF 12:0071cb144c7a 86 unsigned char *iv,
JMF 12:0071cb144c7a 87 const unsigned char *pwd, size_t pwdlen )
JMF 12:0071cb144c7a 88 {
JMF 12:0071cb144c7a 89 mbedtls_md5_context md5_ctx;
JMF 12:0071cb144c7a 90 unsigned char md5sum[16];
JMF 12:0071cb144c7a 91 size_t use_len;
JMF 12:0071cb144c7a 92
JMF 12:0071cb144c7a 93 mbedtls_md5_init( &md5_ctx );
JMF 12:0071cb144c7a 94
JMF 12:0071cb144c7a 95 /*
JMF 12:0071cb144c7a 96 * key[ 0..15] = MD5(pwd || IV)
JMF 12:0071cb144c7a 97 */
JMF 12:0071cb144c7a 98 mbedtls_md5_starts( &md5_ctx );
JMF 12:0071cb144c7a 99 mbedtls_md5_update( &md5_ctx, pwd, pwdlen );
JMF 12:0071cb144c7a 100 mbedtls_md5_update( &md5_ctx, iv, 8 );
JMF 12:0071cb144c7a 101 mbedtls_md5_finish( &md5_ctx, md5sum );
JMF 12:0071cb144c7a 102
JMF 12:0071cb144c7a 103 if( keylen <= 16 )
JMF 12:0071cb144c7a 104 {
JMF 12:0071cb144c7a 105 memcpy( key, md5sum, keylen );
JMF 12:0071cb144c7a 106
JMF 12:0071cb144c7a 107 mbedtls_md5_free( &md5_ctx );
JMF 12:0071cb144c7a 108 mbedtls_zeroize( md5sum, 16 );
JMF 12:0071cb144c7a 109 return;
JMF 12:0071cb144c7a 110 }
JMF 12:0071cb144c7a 111
JMF 12:0071cb144c7a 112 memcpy( key, md5sum, 16 );
JMF 12:0071cb144c7a 113
JMF 12:0071cb144c7a 114 /*
JMF 12:0071cb144c7a 115 * key[16..23] = MD5(key[ 0..15] || pwd || IV])
JMF 12:0071cb144c7a 116 */
JMF 12:0071cb144c7a 117 mbedtls_md5_starts( &md5_ctx );
JMF 12:0071cb144c7a 118 mbedtls_md5_update( &md5_ctx, md5sum, 16 );
JMF 12:0071cb144c7a 119 mbedtls_md5_update( &md5_ctx, pwd, pwdlen );
JMF 12:0071cb144c7a 120 mbedtls_md5_update( &md5_ctx, iv, 8 );
JMF 12:0071cb144c7a 121 mbedtls_md5_finish( &md5_ctx, md5sum );
JMF 12:0071cb144c7a 122
JMF 12:0071cb144c7a 123 use_len = 16;
JMF 12:0071cb144c7a 124 if( keylen < 32 )
JMF 12:0071cb144c7a 125 use_len = keylen - 16;
JMF 12:0071cb144c7a 126
JMF 12:0071cb144c7a 127 memcpy( key + 16, md5sum, use_len );
JMF 12:0071cb144c7a 128
JMF 12:0071cb144c7a 129 mbedtls_md5_free( &md5_ctx );
JMF 12:0071cb144c7a 130 mbedtls_zeroize( md5sum, 16 );
JMF 12:0071cb144c7a 131 }
JMF 12:0071cb144c7a 132
JMF 12:0071cb144c7a 133 #if defined(MBEDTLS_DES_C)
JMF 12:0071cb144c7a 134 /*
JMF 12:0071cb144c7a 135 * Decrypt with DES-CBC, using PBKDF1 for key derivation
JMF 12:0071cb144c7a 136 */
JMF 12:0071cb144c7a 137 static void pem_des_decrypt( unsigned char des_iv[8],
JMF 12:0071cb144c7a 138 unsigned char *buf, size_t buflen,
JMF 12:0071cb144c7a 139 const unsigned char *pwd, size_t pwdlen )
JMF 12:0071cb144c7a 140 {
JMF 12:0071cb144c7a 141 mbedtls_des_context des_ctx;
JMF 12:0071cb144c7a 142 unsigned char des_key[8];
JMF 12:0071cb144c7a 143
JMF 12:0071cb144c7a 144 mbedtls_des_init( &des_ctx );
JMF 12:0071cb144c7a 145
JMF 12:0071cb144c7a 146 pem_pbkdf1( des_key, 8, des_iv, pwd, pwdlen );
JMF 12:0071cb144c7a 147
JMF 12:0071cb144c7a 148 mbedtls_des_setkey_dec( &des_ctx, des_key );
JMF 12:0071cb144c7a 149 mbedtls_des_crypt_cbc( &des_ctx, MBEDTLS_DES_DECRYPT, buflen,
JMF 12:0071cb144c7a 150 des_iv, buf, buf );
JMF 12:0071cb144c7a 151
JMF 12:0071cb144c7a 152 mbedtls_des_free( &des_ctx );
JMF 12:0071cb144c7a 153 mbedtls_zeroize( des_key, 8 );
JMF 12:0071cb144c7a 154 }
JMF 12:0071cb144c7a 155
JMF 12:0071cb144c7a 156 /*
JMF 12:0071cb144c7a 157 * Decrypt with 3DES-CBC, using PBKDF1 for key derivation
JMF 12:0071cb144c7a 158 */
JMF 12:0071cb144c7a 159 static void pem_des3_decrypt( unsigned char des3_iv[8],
JMF 12:0071cb144c7a 160 unsigned char *buf, size_t buflen,
JMF 12:0071cb144c7a 161 const unsigned char *pwd, size_t pwdlen )
JMF 12:0071cb144c7a 162 {
JMF 12:0071cb144c7a 163 mbedtls_des3_context des3_ctx;
JMF 12:0071cb144c7a 164 unsigned char des3_key[24];
JMF 12:0071cb144c7a 165
JMF 12:0071cb144c7a 166 mbedtls_des3_init( &des3_ctx );
JMF 12:0071cb144c7a 167
JMF 12:0071cb144c7a 168 pem_pbkdf1( des3_key, 24, des3_iv, pwd, pwdlen );
JMF 12:0071cb144c7a 169
JMF 12:0071cb144c7a 170 mbedtls_des3_set3key_dec( &des3_ctx, des3_key );
JMF 12:0071cb144c7a 171 mbedtls_des3_crypt_cbc( &des3_ctx, MBEDTLS_DES_DECRYPT, buflen,
JMF 12:0071cb144c7a 172 des3_iv, buf, buf );
JMF 12:0071cb144c7a 173
JMF 12:0071cb144c7a 174 mbedtls_des3_free( &des3_ctx );
JMF 12:0071cb144c7a 175 mbedtls_zeroize( des3_key, 24 );
JMF 12:0071cb144c7a 176 }
JMF 12:0071cb144c7a 177 #endif /* MBEDTLS_DES_C */
JMF 12:0071cb144c7a 178
JMF 12:0071cb144c7a 179 #if defined(MBEDTLS_AES_C)
JMF 12:0071cb144c7a 180 /*
JMF 12:0071cb144c7a 181 * Decrypt with AES-XXX-CBC, using PBKDF1 for key derivation
JMF 12:0071cb144c7a 182 */
JMF 12:0071cb144c7a 183 static void pem_aes_decrypt( unsigned char aes_iv[16], unsigned int keylen,
JMF 12:0071cb144c7a 184 unsigned char *buf, size_t buflen,
JMF 12:0071cb144c7a 185 const unsigned char *pwd, size_t pwdlen )
JMF 12:0071cb144c7a 186 {
JMF 12:0071cb144c7a 187 mbedtls_aes_context aes_ctx;
JMF 12:0071cb144c7a 188 unsigned char aes_key[32];
JMF 12:0071cb144c7a 189
JMF 12:0071cb144c7a 190 mbedtls_aes_init( &aes_ctx );
JMF 12:0071cb144c7a 191
JMF 12:0071cb144c7a 192 pem_pbkdf1( aes_key, keylen, aes_iv, pwd, pwdlen );
JMF 12:0071cb144c7a 193
JMF 12:0071cb144c7a 194 mbedtls_aes_setkey_dec( &aes_ctx, aes_key, keylen * 8 );
JMF 12:0071cb144c7a 195 mbedtls_aes_crypt_cbc( &aes_ctx, MBEDTLS_AES_DECRYPT, buflen,
JMF 12:0071cb144c7a 196 aes_iv, buf, buf );
JMF 12:0071cb144c7a 197
JMF 12:0071cb144c7a 198 mbedtls_aes_free( &aes_ctx );
JMF 12:0071cb144c7a 199 mbedtls_zeroize( aes_key, keylen );
JMF 12:0071cb144c7a 200 }
JMF 12:0071cb144c7a 201 #endif /* MBEDTLS_AES_C */
JMF 12:0071cb144c7a 202
JMF 12:0071cb144c7a 203 #endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
JMF 12:0071cb144c7a 204 ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
JMF 12:0071cb144c7a 205
JMF 12:0071cb144c7a 206 int mbedtls_pem_read_buffer( mbedtls_pem_context *ctx, const char *header, const char *footer,
JMF 12:0071cb144c7a 207 const unsigned char *data, const unsigned char *pwd,
JMF 12:0071cb144c7a 208 size_t pwdlen, size_t *use_len )
JMF 12:0071cb144c7a 209 {
JMF 12:0071cb144c7a 210 int ret, enc;
JMF 12:0071cb144c7a 211 size_t len;
JMF 12:0071cb144c7a 212 unsigned char *buf;
JMF 12:0071cb144c7a 213 const unsigned char *s1, *s2, *end;
JMF 12:0071cb144c7a 214 #if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
JMF 12:0071cb144c7a 215 ( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
JMF 12:0071cb144c7a 216 unsigned char pem_iv[16];
JMF 12:0071cb144c7a 217 mbedtls_cipher_type_t enc_alg = MBEDTLS_CIPHER_NONE;
JMF 12:0071cb144c7a 218 #else
JMF 12:0071cb144c7a 219 ((void) pwd);
JMF 12:0071cb144c7a 220 ((void) pwdlen);
JMF 12:0071cb144c7a 221 #endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
JMF 12:0071cb144c7a 222 ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
JMF 12:0071cb144c7a 223
JMF 12:0071cb144c7a 224 if( ctx == NULL )
JMF 12:0071cb144c7a 225 return( MBEDTLS_ERR_PEM_BAD_INPUT_DATA );
JMF 12:0071cb144c7a 226
JMF 12:0071cb144c7a 227 s1 = (unsigned char *) strstr( (const char *) data, header );
JMF 12:0071cb144c7a 228
JMF 12:0071cb144c7a 229 if( s1 == NULL )
JMF 12:0071cb144c7a 230 return( MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT );
JMF 12:0071cb144c7a 231
JMF 12:0071cb144c7a 232 s2 = (unsigned char *) strstr( (const char *) data, footer );
JMF 12:0071cb144c7a 233
JMF 12:0071cb144c7a 234 if( s2 == NULL || s2 <= s1 )
JMF 12:0071cb144c7a 235 return( MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT );
JMF 12:0071cb144c7a 236
JMF 12:0071cb144c7a 237 s1 += strlen( header );
JMF 12:0071cb144c7a 238 if( *s1 == ' ' ) s1++;
JMF 12:0071cb144c7a 239 if( *s1 == '\r' ) s1++;
JMF 12:0071cb144c7a 240 if( *s1 == '\n' ) s1++;
JMF 12:0071cb144c7a 241 else return( MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT );
JMF 12:0071cb144c7a 242
JMF 12:0071cb144c7a 243 end = s2;
JMF 12:0071cb144c7a 244 end += strlen( footer );
JMF 12:0071cb144c7a 245 if( *end == ' ' ) end++;
JMF 12:0071cb144c7a 246 if( *end == '\r' ) end++;
JMF 12:0071cb144c7a 247 if( *end == '\n' ) end++;
JMF 12:0071cb144c7a 248 *use_len = end - data;
JMF 12:0071cb144c7a 249
JMF 12:0071cb144c7a 250 enc = 0;
JMF 12:0071cb144c7a 251
JMF 12:0071cb144c7a 252 if( memcmp( s1, "Proc-Type: 4,ENCRYPTED", 22 ) == 0 )
JMF 12:0071cb144c7a 253 {
JMF 12:0071cb144c7a 254 #if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
JMF 12:0071cb144c7a 255 ( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
JMF 12:0071cb144c7a 256 enc++;
JMF 12:0071cb144c7a 257
JMF 12:0071cb144c7a 258 s1 += 22;
JMF 12:0071cb144c7a 259 if( *s1 == '\r' ) s1++;
JMF 12:0071cb144c7a 260 if( *s1 == '\n' ) s1++;
JMF 12:0071cb144c7a 261 else return( MBEDTLS_ERR_PEM_INVALID_DATA );
JMF 12:0071cb144c7a 262
JMF 12:0071cb144c7a 263
JMF 12:0071cb144c7a 264 #if defined(MBEDTLS_DES_C)
JMF 12:0071cb144c7a 265 if( memcmp( s1, "DEK-Info: DES-EDE3-CBC,", 23 ) == 0 )
JMF 12:0071cb144c7a 266 {
JMF 12:0071cb144c7a 267 enc_alg = MBEDTLS_CIPHER_DES_EDE3_CBC;
JMF 12:0071cb144c7a 268
JMF 12:0071cb144c7a 269 s1 += 23;
JMF 12:0071cb144c7a 270 if( pem_get_iv( s1, pem_iv, 8 ) != 0 )
JMF 12:0071cb144c7a 271 return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
JMF 12:0071cb144c7a 272
JMF 12:0071cb144c7a 273 s1 += 16;
JMF 12:0071cb144c7a 274 }
JMF 12:0071cb144c7a 275 else if( memcmp( s1, "DEK-Info: DES-CBC,", 18 ) == 0 )
JMF 12:0071cb144c7a 276 {
JMF 12:0071cb144c7a 277 enc_alg = MBEDTLS_CIPHER_DES_CBC;
JMF 12:0071cb144c7a 278
JMF 12:0071cb144c7a 279 s1 += 18;
JMF 12:0071cb144c7a 280 if( pem_get_iv( s1, pem_iv, 8) != 0 )
JMF 12:0071cb144c7a 281 return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
JMF 12:0071cb144c7a 282
JMF 12:0071cb144c7a 283 s1 += 16;
JMF 12:0071cb144c7a 284 }
JMF 12:0071cb144c7a 285 #endif /* MBEDTLS_DES_C */
JMF 12:0071cb144c7a 286
JMF 12:0071cb144c7a 287 #if defined(MBEDTLS_AES_C)
JMF 12:0071cb144c7a 288 if( memcmp( s1, "DEK-Info: AES-", 14 ) == 0 )
JMF 12:0071cb144c7a 289 {
JMF 12:0071cb144c7a 290 if( memcmp( s1, "DEK-Info: AES-128-CBC,", 22 ) == 0 )
JMF 12:0071cb144c7a 291 enc_alg = MBEDTLS_CIPHER_AES_128_CBC;
JMF 12:0071cb144c7a 292 else if( memcmp( s1, "DEK-Info: AES-192-CBC,", 22 ) == 0 )
JMF 12:0071cb144c7a 293 enc_alg = MBEDTLS_CIPHER_AES_192_CBC;
JMF 12:0071cb144c7a 294 else if( memcmp( s1, "DEK-Info: AES-256-CBC,", 22 ) == 0 )
JMF 12:0071cb144c7a 295 enc_alg = MBEDTLS_CIPHER_AES_256_CBC;
JMF 12:0071cb144c7a 296 else
JMF 12:0071cb144c7a 297 return( MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG );
JMF 12:0071cb144c7a 298
JMF 12:0071cb144c7a 299 s1 += 22;
JMF 12:0071cb144c7a 300 if( pem_get_iv( s1, pem_iv, 16 ) != 0 )
JMF 12:0071cb144c7a 301 return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
JMF 12:0071cb144c7a 302
JMF 12:0071cb144c7a 303 s1 += 32;
JMF 12:0071cb144c7a 304 }
JMF 12:0071cb144c7a 305 #endif /* MBEDTLS_AES_C */
JMF 12:0071cb144c7a 306
JMF 12:0071cb144c7a 307 if( enc_alg == MBEDTLS_CIPHER_NONE )
JMF 12:0071cb144c7a 308 return( MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG );
JMF 12:0071cb144c7a 309
JMF 12:0071cb144c7a 310 if( *s1 == '\r' ) s1++;
JMF 12:0071cb144c7a 311 if( *s1 == '\n' ) s1++;
JMF 12:0071cb144c7a 312 else return( MBEDTLS_ERR_PEM_INVALID_DATA );
JMF 12:0071cb144c7a 313 #else
JMF 12:0071cb144c7a 314 return( MBEDTLS_ERR_PEM_FEATURE_UNAVAILABLE );
JMF 12:0071cb144c7a 315 #endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
JMF 12:0071cb144c7a 316 ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
JMF 12:0071cb144c7a 317 }
JMF 12:0071cb144c7a 318
JMF 12:0071cb144c7a 319 if( s1 == s2 )
JMF 12:0071cb144c7a 320 return( MBEDTLS_ERR_PEM_INVALID_DATA );
JMF 12:0071cb144c7a 321
JMF 12:0071cb144c7a 322 ret = mbedtls_base64_decode( NULL, 0, &len, s1, s2 - s1 );
JMF 12:0071cb144c7a 323
JMF 12:0071cb144c7a 324 if( ret == MBEDTLS_ERR_BASE64_INVALID_CHARACTER )
JMF 12:0071cb144c7a 325 return( MBEDTLS_ERR_PEM_INVALID_DATA + ret );
JMF 12:0071cb144c7a 326
JMF 12:0071cb144c7a 327 if( ( buf = mbedtls_calloc( 1, len ) ) == NULL )
JMF 12:0071cb144c7a 328 return( MBEDTLS_ERR_PEM_ALLOC_FAILED );
JMF 12:0071cb144c7a 329
JMF 12:0071cb144c7a 330 if( ( ret = mbedtls_base64_decode( buf, len, &len, s1, s2 - s1 ) ) != 0 )
JMF 12:0071cb144c7a 331 {
JMF 12:0071cb144c7a 332 mbedtls_free( buf );
JMF 12:0071cb144c7a 333 return( MBEDTLS_ERR_PEM_INVALID_DATA + ret );
JMF 12:0071cb144c7a 334 }
JMF 12:0071cb144c7a 335
JMF 12:0071cb144c7a 336 if( enc != 0 )
JMF 12:0071cb144c7a 337 {
JMF 12:0071cb144c7a 338 #if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
JMF 12:0071cb144c7a 339 ( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
JMF 12:0071cb144c7a 340 if( pwd == NULL )
JMF 12:0071cb144c7a 341 {
JMF 12:0071cb144c7a 342 mbedtls_free( buf );
JMF 12:0071cb144c7a 343 return( MBEDTLS_ERR_PEM_PASSWORD_REQUIRED );
JMF 12:0071cb144c7a 344 }
JMF 12:0071cb144c7a 345
JMF 12:0071cb144c7a 346 #if defined(MBEDTLS_DES_C)
JMF 12:0071cb144c7a 347 if( enc_alg == MBEDTLS_CIPHER_DES_EDE3_CBC )
JMF 12:0071cb144c7a 348 pem_des3_decrypt( pem_iv, buf, len, pwd, pwdlen );
JMF 12:0071cb144c7a 349 else if( enc_alg == MBEDTLS_CIPHER_DES_CBC )
JMF 12:0071cb144c7a 350 pem_des_decrypt( pem_iv, buf, len, pwd, pwdlen );
JMF 12:0071cb144c7a 351 #endif /* MBEDTLS_DES_C */
JMF 12:0071cb144c7a 352
JMF 12:0071cb144c7a 353 #if defined(MBEDTLS_AES_C)
JMF 12:0071cb144c7a 354 if( enc_alg == MBEDTLS_CIPHER_AES_128_CBC )
JMF 12:0071cb144c7a 355 pem_aes_decrypt( pem_iv, 16, buf, len, pwd, pwdlen );
JMF 12:0071cb144c7a 356 else if( enc_alg == MBEDTLS_CIPHER_AES_192_CBC )
JMF 12:0071cb144c7a 357 pem_aes_decrypt( pem_iv, 24, buf, len, pwd, pwdlen );
JMF 12:0071cb144c7a 358 else if( enc_alg == MBEDTLS_CIPHER_AES_256_CBC )
JMF 12:0071cb144c7a 359 pem_aes_decrypt( pem_iv, 32, buf, len, pwd, pwdlen );
JMF 12:0071cb144c7a 360 #endif /* MBEDTLS_AES_C */
JMF 12:0071cb144c7a 361
JMF 12:0071cb144c7a 362 /*
JMF 12:0071cb144c7a 363 * The result will be ASN.1 starting with a SEQUENCE tag, with 1 to 3
JMF 12:0071cb144c7a 364 * length bytes (allow 4 to be sure) in all known use cases.
JMF 12:0071cb144c7a 365 *
JMF 12:0071cb144c7a 366 * Use that as heurisitic to try detecting password mismatchs.
JMF 12:0071cb144c7a 367 */
JMF 12:0071cb144c7a 368 if( len <= 2 || buf[0] != 0x30 || buf[1] > 0x83 )
JMF 12:0071cb144c7a 369 {
JMF 12:0071cb144c7a 370 mbedtls_free( buf );
JMF 12:0071cb144c7a 371 return( MBEDTLS_ERR_PEM_PASSWORD_MISMATCH );
JMF 12:0071cb144c7a 372 }
JMF 12:0071cb144c7a 373 #else
JMF 12:0071cb144c7a 374 mbedtls_free( buf );
JMF 12:0071cb144c7a 375 return( MBEDTLS_ERR_PEM_FEATURE_UNAVAILABLE );
JMF 12:0071cb144c7a 376 #endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC &&
JMF 12:0071cb144c7a 377 ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
JMF 12:0071cb144c7a 378 }
JMF 12:0071cb144c7a 379
JMF 12:0071cb144c7a 380 ctx->buf = buf;
JMF 12:0071cb144c7a 381 ctx->buflen = len;
JMF 12:0071cb144c7a 382
JMF 12:0071cb144c7a 383 return( 0 );
JMF 12:0071cb144c7a 384 }
JMF 12:0071cb144c7a 385
JMF 12:0071cb144c7a 386 void mbedtls_pem_free( mbedtls_pem_context *ctx )
JMF 12:0071cb144c7a 387 {
JMF 12:0071cb144c7a 388 mbedtls_free( ctx->buf );
JMF 12:0071cb144c7a 389 mbedtls_free( ctx->info );
JMF 12:0071cb144c7a 390
JMF 12:0071cb144c7a 391 mbedtls_zeroize( ctx, sizeof( mbedtls_pem_context ) );
JMF 12:0071cb144c7a 392 }
JMF 12:0071cb144c7a 393 #endif /* MBEDTLS_PEM_PARSE_C */
JMF 12:0071cb144c7a 394
JMF 12:0071cb144c7a 395 #if defined(MBEDTLS_PEM_WRITE_C)
JMF 12:0071cb144c7a 396 int mbedtls_pem_write_buffer( const char *header, const char *footer,
JMF 12:0071cb144c7a 397 const unsigned char *der_data, size_t der_len,
JMF 12:0071cb144c7a 398 unsigned char *buf, size_t buf_len, size_t *olen )
JMF 12:0071cb144c7a 399 {
JMF 12:0071cb144c7a 400 int ret;
JMF 12:0071cb144c7a 401 unsigned char *encode_buf, *c, *p = buf;
JMF 12:0071cb144c7a 402 size_t len = 0, use_len, add_len = 0;
JMF 12:0071cb144c7a 403
JMF 12:0071cb144c7a 404 mbedtls_base64_encode( NULL, 0, &use_len, der_data, der_len );
JMF 12:0071cb144c7a 405 add_len = strlen( header ) + strlen( footer ) + ( use_len / 64 ) + 1;
JMF 12:0071cb144c7a 406
JMF 12:0071cb144c7a 407 if( use_len + add_len > buf_len )
JMF 12:0071cb144c7a 408 {
JMF 12:0071cb144c7a 409 *olen = use_len + add_len;
JMF 12:0071cb144c7a 410 return( MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL );
JMF 12:0071cb144c7a 411 }
JMF 12:0071cb144c7a 412
JMF 12:0071cb144c7a 413 if( ( encode_buf = mbedtls_calloc( 1, use_len ) ) == NULL )
JMF 12:0071cb144c7a 414 return( MBEDTLS_ERR_PEM_ALLOC_FAILED );
JMF 12:0071cb144c7a 415
JMF 12:0071cb144c7a 416 if( ( ret = mbedtls_base64_encode( encode_buf, use_len, &use_len, der_data,
JMF 12:0071cb144c7a 417 der_len ) ) != 0 )
JMF 12:0071cb144c7a 418 {
JMF 12:0071cb144c7a 419 mbedtls_free( encode_buf );
JMF 12:0071cb144c7a 420 return( ret );
JMF 12:0071cb144c7a 421 }
JMF 12:0071cb144c7a 422
JMF 12:0071cb144c7a 423 memcpy( p, header, strlen( header ) );
JMF 12:0071cb144c7a 424 p += strlen( header );
JMF 12:0071cb144c7a 425 c = encode_buf;
JMF 12:0071cb144c7a 426
JMF 12:0071cb144c7a 427 while( use_len )
JMF 12:0071cb144c7a 428 {
JMF 12:0071cb144c7a 429 len = ( use_len > 64 ) ? 64 : use_len;
JMF 12:0071cb144c7a 430 memcpy( p, c, len );
JMF 12:0071cb144c7a 431 use_len -= len;
JMF 12:0071cb144c7a 432 p += len;
JMF 12:0071cb144c7a 433 c += len;
JMF 12:0071cb144c7a 434 *p++ = '\n';
JMF 12:0071cb144c7a 435 }
JMF 12:0071cb144c7a 436
JMF 12:0071cb144c7a 437 memcpy( p, footer, strlen( footer ) );
JMF 12:0071cb144c7a 438 p += strlen( footer );
JMF 12:0071cb144c7a 439
JMF 12:0071cb144c7a 440 *p++ = '\0';
JMF 12:0071cb144c7a 441 *olen = p - buf;
JMF 12:0071cb144c7a 442
JMF 12:0071cb144c7a 443 mbedtls_free( encode_buf );
JMF 12:0071cb144c7a 444 return( 0 );
JMF 12:0071cb144c7a 445 }
JMF 12:0071cb144c7a 446 #endif /* MBEDTLS_PEM_WRITE_C */
JMF 12:0071cb144c7a 447 #endif /* MBEDTLS_PEM_PARSE_C || MBEDTLS_PEM_WRITE_C */