Mark Radbourne / mbedtls

mbed TLS Build

Dependents:   Encrypt_Decrypt1 mbed_blink_tls encrypt encrypt

library/pkcs12.c@0:cdf462088d13, 2017-01-05 (annotated)

Committer:
markrad
Date:
Thu Jan 05 00:18:44 2017 +0000
Revision:
0:cdf462088d13
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
markrad 0:cdf462088d13 1 /*
markrad 0:cdf462088d13 2 * PKCS#12 Personal Information Exchange Syntax
markrad 0:cdf462088d13 3 *
markrad 0:cdf462088d13 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
markrad 0:cdf462088d13 5 * SPDX-License-Identifier: Apache-2.0
markrad 0:cdf462088d13 6 *
markrad 0:cdf462088d13 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
markrad 0:cdf462088d13 8 * not use this file except in compliance with the License.
markrad 0:cdf462088d13 9 * You may obtain a copy of the License at
markrad 0:cdf462088d13 10 *
markrad 0:cdf462088d13 11 * http://www.apache.org/licenses/LICENSE-2.0
markrad 0:cdf462088d13 12 *
markrad 0:cdf462088d13 13 * Unless required by applicable law or agreed to in writing, software
markrad 0:cdf462088d13 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
markrad 0:cdf462088d13 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
markrad 0:cdf462088d13 16 * See the License for the specific language governing permissions and
markrad 0:cdf462088d13 17 * limitations under the License.
markrad 0:cdf462088d13 18 *
markrad 0:cdf462088d13 19 * This file is part of mbed TLS (https://tls.mbed.org)
markrad 0:cdf462088d13 20 */
markrad 0:cdf462088d13 21 /*
markrad 0:cdf462088d13 22 * The PKCS #12 Personal Information Exchange Syntax Standard v1.1
markrad 0:cdf462088d13 23 *
markrad 0:cdf462088d13 24 * http://www.rsa.com/rsalabs/pkcs/files/h11301-wp-pkcs-12v1-1-personal-information-exchange-syntax.pdf
markrad 0:cdf462088d13 25 * ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-12/pkcs-12v1-1.asn
markrad 0:cdf462088d13 26 */
markrad 0:cdf462088d13 27
markrad 0:cdf462088d13 28 #if !defined(MBEDTLS_CONFIG_FILE)
markrad 0:cdf462088d13 29 #include "mbedtls/config.h"
markrad 0:cdf462088d13 30 #else
markrad 0:cdf462088d13 31 #include MBEDTLS_CONFIG_FILE
markrad 0:cdf462088d13 32 #endif
markrad 0:cdf462088d13 33
markrad 0:cdf462088d13 34 #if defined(MBEDTLS_PKCS12_C)
markrad 0:cdf462088d13 35
markrad 0:cdf462088d13 36 #include "mbedtls/pkcs12.h"
markrad 0:cdf462088d13 37 #include "mbedtls/asn1.h"
markrad 0:cdf462088d13 38 #include "mbedtls/cipher.h"
markrad 0:cdf462088d13 39
markrad 0:cdf462088d13 40 #include <string.h>
markrad 0:cdf462088d13 41
markrad 0:cdf462088d13 42 #if defined(MBEDTLS_ARC4_C)
markrad 0:cdf462088d13 43 #include "mbedtls/arc4.h"
markrad 0:cdf462088d13 44 #endif
markrad 0:cdf462088d13 45
markrad 0:cdf462088d13 46 #if defined(MBEDTLS_DES_C)
markrad 0:cdf462088d13 47 #include "mbedtls/des.h"
markrad 0:cdf462088d13 48 #endif
markrad 0:cdf462088d13 49
markrad 0:cdf462088d13 50 /* Implementation that should never be optimized out by the compiler */
markrad 0:cdf462088d13 51 static void mbedtls_zeroize( void *v, size_t n ) {
markrad 0:cdf462088d13 52 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
markrad 0:cdf462088d13 53 }
markrad 0:cdf462088d13 54
markrad 0:cdf462088d13 55 static int pkcs12_parse_pbe_params( mbedtls_asn1_buf *params,
markrad 0:cdf462088d13 56 mbedtls_asn1_buf *salt, int *iterations )
markrad 0:cdf462088d13 57 {
markrad 0:cdf462088d13 58 int ret;
markrad 0:cdf462088d13 59 unsigned char **p = &params->p;
markrad 0:cdf462088d13 60 const unsigned char *end = params->p + params->len;
markrad 0:cdf462088d13 61
markrad 0:cdf462088d13 62 /*
markrad 0:cdf462088d13 63 * pkcs-12PbeParams ::= SEQUENCE {
markrad 0:cdf462088d13 64 * salt OCTET STRING,
markrad 0:cdf462088d13 65 * iterations INTEGER
markrad 0:cdf462088d13 66 * }
markrad 0:cdf462088d13 67 *
markrad 0:cdf462088d13 68 */
markrad 0:cdf462088d13 69 if( params->tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) )
markrad 0:cdf462088d13 70 return( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT +
markrad 0:cdf462088d13 71 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
markrad 0:cdf462088d13 72
markrad 0:cdf462088d13 73 if( ( ret = mbedtls_asn1_get_tag( p, end, &salt->len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
markrad 0:cdf462088d13 74 return( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT + ret );
markrad 0:cdf462088d13 75
markrad 0:cdf462088d13 76 salt->p = *p;
markrad 0:cdf462088d13 77 *p += salt->len;
markrad 0:cdf462088d13 78
markrad 0:cdf462088d13 79 if( ( ret = mbedtls_asn1_get_int( p, end, iterations ) ) != 0 )
markrad 0:cdf462088d13 80 return( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT + ret );
markrad 0:cdf462088d13 81
markrad 0:cdf462088d13 82 if( *p != end )
markrad 0:cdf462088d13 83 return( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT +
markrad 0:cdf462088d13 84 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
markrad 0:cdf462088d13 85
markrad 0:cdf462088d13 86 return( 0 );
markrad 0:cdf462088d13 87 }
markrad 0:cdf462088d13 88
markrad 0:cdf462088d13 89 #define PKCS12_MAX_PWDLEN 128
markrad 0:cdf462088d13 90
markrad 0:cdf462088d13 91 static int pkcs12_pbe_derive_key_iv( mbedtls_asn1_buf *pbe_params, mbedtls_md_type_t md_type,
markrad 0:cdf462088d13 92 const unsigned char *pwd, size_t pwdlen,
markrad 0:cdf462088d13 93 unsigned char *key, size_t keylen,
markrad 0:cdf462088d13 94 unsigned char *iv, size_t ivlen )
markrad 0:cdf462088d13 95 {
markrad 0:cdf462088d13 96 int ret, iterations = 0;
markrad 0:cdf462088d13 97 mbedtls_asn1_buf salt;
markrad 0:cdf462088d13 98 size_t i;
markrad 0:cdf462088d13 99 unsigned char unipwd[PKCS12_MAX_PWDLEN * 2 + 2];
markrad 0:cdf462088d13 100
markrad 0:cdf462088d13 101 if( pwdlen > PKCS12_MAX_PWDLEN )
markrad 0:cdf462088d13 102 return( MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA );
markrad 0:cdf462088d13 103
markrad 0:cdf462088d13 104 memset( &salt, 0, sizeof(mbedtls_asn1_buf) );
markrad 0:cdf462088d13 105 memset( &unipwd, 0, sizeof(unipwd) );
markrad 0:cdf462088d13 106
markrad 0:cdf462088d13 107 if( ( ret = pkcs12_parse_pbe_params( pbe_params, &salt,
markrad 0:cdf462088d13 108 &iterations ) ) != 0 )
markrad 0:cdf462088d13 109 return( ret );
markrad 0:cdf462088d13 110
markrad 0:cdf462088d13 111 for( i = 0; i < pwdlen; i++ )
markrad 0:cdf462088d13 112 unipwd[i * 2 + 1] = pwd[i];
markrad 0:cdf462088d13 113
markrad 0:cdf462088d13 114 if( ( ret = mbedtls_pkcs12_derivation( key, keylen, unipwd, pwdlen * 2 + 2,
markrad 0:cdf462088d13 115 salt.p, salt.len, md_type,
markrad 0:cdf462088d13 116 MBEDTLS_PKCS12_DERIVE_KEY, iterations ) ) != 0 )
markrad 0:cdf462088d13 117 {
markrad 0:cdf462088d13 118 return( ret );
markrad 0:cdf462088d13 119 }
markrad 0:cdf462088d13 120
markrad 0:cdf462088d13 121 if( iv == NULL || ivlen == 0 )
markrad 0:cdf462088d13 122 return( 0 );
markrad 0:cdf462088d13 123
markrad 0:cdf462088d13 124 if( ( ret = mbedtls_pkcs12_derivation( iv, ivlen, unipwd, pwdlen * 2 + 2,
markrad 0:cdf462088d13 125 salt.p, salt.len, md_type,
markrad 0:cdf462088d13 126 MBEDTLS_PKCS12_DERIVE_IV, iterations ) ) != 0 )
markrad 0:cdf462088d13 127 {
markrad 0:cdf462088d13 128 return( ret );
markrad 0:cdf462088d13 129 }
markrad 0:cdf462088d13 130 return( 0 );
markrad 0:cdf462088d13 131 }
markrad 0:cdf462088d13 132
markrad 0:cdf462088d13 133 #undef PKCS12_MAX_PWDLEN
markrad 0:cdf462088d13 134
markrad 0:cdf462088d13 135 int mbedtls_pkcs12_pbe_sha1_rc4_128( mbedtls_asn1_buf *pbe_params, int mode,
markrad 0:cdf462088d13 136 const unsigned char *pwd, size_t pwdlen,
markrad 0:cdf462088d13 137 const unsigned char *data, size_t len,
markrad 0:cdf462088d13 138 unsigned char *output )
markrad 0:cdf462088d13 139 {
markrad 0:cdf462088d13 140 #if !defined(MBEDTLS_ARC4_C)
markrad 0:cdf462088d13 141 ((void) pbe_params);
markrad 0:cdf462088d13 142 ((void) mode);
markrad 0:cdf462088d13 143 ((void) pwd);
markrad 0:cdf462088d13 144 ((void) pwdlen);
markrad 0:cdf462088d13 145 ((void) data);
markrad 0:cdf462088d13 146 ((void) len);
markrad 0:cdf462088d13 147 ((void) output);
markrad 0:cdf462088d13 148 return( MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE );
markrad 0:cdf462088d13 149 #else
markrad 0:cdf462088d13 150 int ret;
markrad 0:cdf462088d13 151 unsigned char key[16];
markrad 0:cdf462088d13 152 mbedtls_arc4_context ctx;
markrad 0:cdf462088d13 153 ((void) mode);
markrad 0:cdf462088d13 154
markrad 0:cdf462088d13 155 mbedtls_arc4_init( &ctx );
markrad 0:cdf462088d13 156
markrad 0:cdf462088d13 157 if( ( ret = pkcs12_pbe_derive_key_iv( pbe_params, MBEDTLS_MD_SHA1,
markrad 0:cdf462088d13 158 pwd, pwdlen,
markrad 0:cdf462088d13 159 key, 16, NULL, 0 ) ) != 0 )
markrad 0:cdf462088d13 160 {
markrad 0:cdf462088d13 161 return( ret );
markrad 0:cdf462088d13 162 }
markrad 0:cdf462088d13 163
markrad 0:cdf462088d13 164 mbedtls_arc4_setup( &ctx, key, 16 );
markrad 0:cdf462088d13 165 if( ( ret = mbedtls_arc4_crypt( &ctx, len, data, output ) ) != 0 )
markrad 0:cdf462088d13 166 goto exit;
markrad 0:cdf462088d13 167
markrad 0:cdf462088d13 168 exit:
markrad 0:cdf462088d13 169 mbedtls_zeroize( key, sizeof( key ) );
markrad 0:cdf462088d13 170 mbedtls_arc4_free( &ctx );
markrad 0:cdf462088d13 171
markrad 0:cdf462088d13 172 return( ret );
markrad 0:cdf462088d13 173 #endif /* MBEDTLS_ARC4_C */
markrad 0:cdf462088d13 174 }
markrad 0:cdf462088d13 175
markrad 0:cdf462088d13 176 int mbedtls_pkcs12_pbe( mbedtls_asn1_buf *pbe_params, int mode,
markrad 0:cdf462088d13 177 mbedtls_cipher_type_t cipher_type, mbedtls_md_type_t md_type,
markrad 0:cdf462088d13 178 const unsigned char *pwd, size_t pwdlen,
markrad 0:cdf462088d13 179 const unsigned char *data, size_t len,
markrad 0:cdf462088d13 180 unsigned char *output )
markrad 0:cdf462088d13 181 {
markrad 0:cdf462088d13 182 int ret, keylen = 0;
markrad 0:cdf462088d13 183 unsigned char key[32];
markrad 0:cdf462088d13 184 unsigned char iv[16];
markrad 0:cdf462088d13 185 const mbedtls_cipher_info_t *cipher_info;
markrad 0:cdf462088d13 186 mbedtls_cipher_context_t cipher_ctx;
markrad 0:cdf462088d13 187 size_t olen = 0;
markrad 0:cdf462088d13 188
markrad 0:cdf462088d13 189 cipher_info = mbedtls_cipher_info_from_type( cipher_type );
markrad 0:cdf462088d13 190 if( cipher_info == NULL )
markrad 0:cdf462088d13 191 return( MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE );
markrad 0:cdf462088d13 192
markrad 0:cdf462088d13 193 keylen = cipher_info->key_bitlen / 8;
markrad 0:cdf462088d13 194
markrad 0:cdf462088d13 195 if( ( ret = pkcs12_pbe_derive_key_iv( pbe_params, md_type, pwd, pwdlen,
markrad 0:cdf462088d13 196 key, keylen,
markrad 0:cdf462088d13 197 iv, cipher_info->iv_size ) ) != 0 )
markrad 0:cdf462088d13 198 {
markrad 0:cdf462088d13 199 return( ret );
markrad 0:cdf462088d13 200 }
markrad 0:cdf462088d13 201
markrad 0:cdf462088d13 202 mbedtls_cipher_init( &cipher_ctx );
markrad 0:cdf462088d13 203
markrad 0:cdf462088d13 204 if( ( ret = mbedtls_cipher_setup( &cipher_ctx, cipher_info ) ) != 0 )
markrad 0:cdf462088d13 205 goto exit;
markrad 0:cdf462088d13 206
markrad 0:cdf462088d13 207 if( ( ret = mbedtls_cipher_setkey( &cipher_ctx, key, 8 * keylen, (mbedtls_operation_t) mode ) ) != 0 )
markrad 0:cdf462088d13 208 goto exit;
markrad 0:cdf462088d13 209
markrad 0:cdf462088d13 210 if( ( ret = mbedtls_cipher_set_iv( &cipher_ctx, iv, cipher_info->iv_size ) ) != 0 )
markrad 0:cdf462088d13 211 goto exit;
markrad 0:cdf462088d13 212
markrad 0:cdf462088d13 213 if( ( ret = mbedtls_cipher_reset( &cipher_ctx ) ) != 0 )
markrad 0:cdf462088d13 214 goto exit;
markrad 0:cdf462088d13 215
markrad 0:cdf462088d13 216 if( ( ret = mbedtls_cipher_update( &cipher_ctx, data, len,
markrad 0:cdf462088d13 217 output, &olen ) ) != 0 )
markrad 0:cdf462088d13 218 {
markrad 0:cdf462088d13 219 goto exit;
markrad 0:cdf462088d13 220 }
markrad 0:cdf462088d13 221
markrad 0:cdf462088d13 222 if( ( ret = mbedtls_cipher_finish( &cipher_ctx, output + olen, &olen ) ) != 0 )
markrad 0:cdf462088d13 223 ret = MBEDTLS_ERR_PKCS12_PASSWORD_MISMATCH;
markrad 0:cdf462088d13 224
markrad 0:cdf462088d13 225 exit:
markrad 0:cdf462088d13 226 mbedtls_zeroize( key, sizeof( key ) );
markrad 0:cdf462088d13 227 mbedtls_zeroize( iv, sizeof( iv ) );
markrad 0:cdf462088d13 228 mbedtls_cipher_free( &cipher_ctx );
markrad 0:cdf462088d13 229
markrad 0:cdf462088d13 230 return( ret );
markrad 0:cdf462088d13 231 }
markrad 0:cdf462088d13 232
markrad 0:cdf462088d13 233 static void pkcs12_fill_buffer( unsigned char *data, size_t data_len,
markrad 0:cdf462088d13 234 const unsigned char *filler, size_t fill_len )
markrad 0:cdf462088d13 235 {
markrad 0:cdf462088d13 236 unsigned char *p = data;
markrad 0:cdf462088d13 237 size_t use_len;
markrad 0:cdf462088d13 238
markrad 0:cdf462088d13 239 while( data_len > 0 )
markrad 0:cdf462088d13 240 {
markrad 0:cdf462088d13 241 use_len = ( data_len > fill_len ) ? fill_len : data_len;
markrad 0:cdf462088d13 242 memcpy( p, filler, use_len );
markrad 0:cdf462088d13 243 p += use_len;
markrad 0:cdf462088d13 244 data_len -= use_len;
markrad 0:cdf462088d13 245 }
markrad 0:cdf462088d13 246 }
markrad 0:cdf462088d13 247
markrad 0:cdf462088d13 248 int mbedtls_pkcs12_derivation( unsigned char *data, size_t datalen,
markrad 0:cdf462088d13 249 const unsigned char *pwd, size_t pwdlen,
markrad 0:cdf462088d13 250 const unsigned char *salt, size_t saltlen,
markrad 0:cdf462088d13 251 mbedtls_md_type_t md_type, int id, int iterations )
markrad 0:cdf462088d13 252 {
markrad 0:cdf462088d13 253 int ret;
markrad 0:cdf462088d13 254 unsigned int j;
markrad 0:cdf462088d13 255
markrad 0:cdf462088d13 256 unsigned char diversifier[128];
markrad 0:cdf462088d13 257 unsigned char salt_block[128], pwd_block[128], hash_block[128];
markrad 0:cdf462088d13 258 unsigned char hash_output[MBEDTLS_MD_MAX_SIZE];
markrad 0:cdf462088d13 259 unsigned char *p;
markrad 0:cdf462088d13 260 unsigned char c;
markrad 0:cdf462088d13 261
markrad 0:cdf462088d13 262 size_t hlen, use_len, v, i;
markrad 0:cdf462088d13 263
markrad 0:cdf462088d13 264 const mbedtls_md_info_t *md_info;
markrad 0:cdf462088d13 265 mbedtls_md_context_t md_ctx;
markrad 0:cdf462088d13 266
markrad 0:cdf462088d13 267 // This version only allows max of 64 bytes of password or salt
markrad 0:cdf462088d13 268 if( datalen > 128 || pwdlen > 64 || saltlen > 64 )
markrad 0:cdf462088d13 269 return( MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA );
markrad 0:cdf462088d13 270
markrad 0:cdf462088d13 271 md_info = mbedtls_md_info_from_type( md_type );
markrad 0:cdf462088d13 272 if( md_info == NULL )
markrad 0:cdf462088d13 273 return( MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE );
markrad 0:cdf462088d13 274
markrad 0:cdf462088d13 275 mbedtls_md_init( &md_ctx );
markrad 0:cdf462088d13 276
markrad 0:cdf462088d13 277 if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 0 ) ) != 0 )
markrad 0:cdf462088d13 278 return( ret );
markrad 0:cdf462088d13 279 hlen = mbedtls_md_get_size( md_info );
markrad 0:cdf462088d13 280
markrad 0:cdf462088d13 281 if( hlen <= 32 )
markrad 0:cdf462088d13 282 v = 64;
markrad 0:cdf462088d13 283 else
markrad 0:cdf462088d13 284 v = 128;
markrad 0:cdf462088d13 285
markrad 0:cdf462088d13 286 memset( diversifier, (unsigned char) id, v );
markrad 0:cdf462088d13 287
markrad 0:cdf462088d13 288 pkcs12_fill_buffer( salt_block, v, salt, saltlen );
markrad 0:cdf462088d13 289 pkcs12_fill_buffer( pwd_block, v, pwd, pwdlen );
markrad 0:cdf462088d13 290
markrad 0:cdf462088d13 291 p = data;
markrad 0:cdf462088d13 292 while( datalen > 0 )
markrad 0:cdf462088d13 293 {
markrad 0:cdf462088d13 294 // Calculate hash( diversifier || salt_block || pwd_block )
markrad 0:cdf462088d13 295 if( ( ret = mbedtls_md_starts( &md_ctx ) ) != 0 )
markrad 0:cdf462088d13 296 goto exit;
markrad 0:cdf462088d13 297
markrad 0:cdf462088d13 298 if( ( ret = mbedtls_md_update( &md_ctx, diversifier, v ) ) != 0 )
markrad 0:cdf462088d13 299 goto exit;
markrad 0:cdf462088d13 300
markrad 0:cdf462088d13 301 if( ( ret = mbedtls_md_update( &md_ctx, salt_block, v ) ) != 0 )
markrad 0:cdf462088d13 302 goto exit;
markrad 0:cdf462088d13 303
markrad 0:cdf462088d13 304 if( ( ret = mbedtls_md_update( &md_ctx, pwd_block, v ) ) != 0 )
markrad 0:cdf462088d13 305 goto exit;
markrad 0:cdf462088d13 306
markrad 0:cdf462088d13 307 if( ( ret = mbedtls_md_finish( &md_ctx, hash_output ) ) != 0 )
markrad 0:cdf462088d13 308 goto exit;
markrad 0:cdf462088d13 309
markrad 0:cdf462088d13 310 // Perform remaining ( iterations - 1 ) recursive hash calculations
markrad 0:cdf462088d13 311 for( i = 1; i < (size_t) iterations; i++ )
markrad 0:cdf462088d13 312 {
markrad 0:cdf462088d13 313 if( ( ret = mbedtls_md( md_info, hash_output, hlen, hash_output ) ) != 0 )
markrad 0:cdf462088d13 314 goto exit;
markrad 0:cdf462088d13 315 }
markrad 0:cdf462088d13 316
markrad 0:cdf462088d13 317 use_len = ( datalen > hlen ) ? hlen : datalen;
markrad 0:cdf462088d13 318 memcpy( p, hash_output, use_len );
markrad 0:cdf462088d13 319 datalen -= use_len;
markrad 0:cdf462088d13 320 p += use_len;
markrad 0:cdf462088d13 321
markrad 0:cdf462088d13 322 if( datalen == 0 )
markrad 0:cdf462088d13 323 break;
markrad 0:cdf462088d13 324
markrad 0:cdf462088d13 325 // Concatenating copies of hash_output into hash_block (B)
markrad 0:cdf462088d13 326 pkcs12_fill_buffer( hash_block, v, hash_output, hlen );
markrad 0:cdf462088d13 327
markrad 0:cdf462088d13 328 // B += 1
markrad 0:cdf462088d13 329 for( i = v; i > 0; i-- )
markrad 0:cdf462088d13 330 if( ++hash_block[i - 1] != 0 )
markrad 0:cdf462088d13 331 break;
markrad 0:cdf462088d13 332
markrad 0:cdf462088d13 333 // salt_block += B
markrad 0:cdf462088d13 334 c = 0;
markrad 0:cdf462088d13 335 for( i = v; i > 0; i-- )
markrad 0:cdf462088d13 336 {
markrad 0:cdf462088d13 337 j = salt_block[i - 1] + hash_block[i - 1] + c;
markrad 0:cdf462088d13 338 c = (unsigned char) (j >> 8);
markrad 0:cdf462088d13 339 salt_block[i - 1] = j & 0xFF;
markrad 0:cdf462088d13 340 }
markrad 0:cdf462088d13 341
markrad 0:cdf462088d13 342 // pwd_block += B
markrad 0:cdf462088d13 343 c = 0;
markrad 0:cdf462088d13 344 for( i = v; i > 0; i-- )
markrad 0:cdf462088d13 345 {
markrad 0:cdf462088d13 346 j = pwd_block[i - 1] + hash_block[i - 1] + c;
markrad 0:cdf462088d13 347 c = (unsigned char) (j >> 8);
markrad 0:cdf462088d13 348 pwd_block[i - 1] = j & 0xFF;
markrad 0:cdf462088d13 349 }
markrad 0:cdf462088d13 350 }
markrad 0:cdf462088d13 351
markrad 0:cdf462088d13 352 ret = 0;
markrad 0:cdf462088d13 353
markrad 0:cdf462088d13 354 exit:
markrad 0:cdf462088d13 355 mbedtls_zeroize( salt_block, sizeof( salt_block ) );
markrad 0:cdf462088d13 356 mbedtls_zeroize( pwd_block, sizeof( pwd_block ) );
markrad 0:cdf462088d13 357 mbedtls_zeroize( hash_block, sizeof( hash_block ) );
markrad 0:cdf462088d13 358 mbedtls_zeroize( hash_output, sizeof( hash_output ) );
markrad 0:cdf462088d13 359
markrad 0:cdf462088d13 360 mbedtls_md_free( &md_ctx );
markrad 0:cdf462088d13 361
markrad 0:cdf462088d13 362 return( ret );
markrad 0:cdf462088d13 363 }
markrad 0:cdf462088d13 364
markrad 0:cdf462088d13 365 #endif /* MBEDTLS_PKCS12_C */