erkin yucel / mbed-os

mbed os with nrf51 internal bandgap enabled to read battery level

Dependents:   BLE_file_test BLE_Blink ExternalEncoder

features/mbedtls/src/pkcs12.c@0:f269e3021894, 2016-10-23 (annotated)

Committer:
elessair
Date:
Sun Oct 23 15:10:02 2016 +0000
Revision:
0:f269e3021894
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
elessair 0:f269e3021894 1 /*
elessair 0:f269e3021894 2 * PKCS#12 Personal Information Exchange Syntax
elessair 0:f269e3021894 3 *
elessair 0:f269e3021894 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
elessair 0:f269e3021894 5 * SPDX-License-Identifier: Apache-2.0
elessair 0:f269e3021894 6 *
elessair 0:f269e3021894 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
elessair 0:f269e3021894 8 * not use this file except in compliance with the License.
elessair 0:f269e3021894 9 * You may obtain a copy of the License at
elessair 0:f269e3021894 10 *
elessair 0:f269e3021894 11 * http://www.apache.org/licenses/LICENSE-2.0
elessair 0:f269e3021894 12 *
elessair 0:f269e3021894 13 * Unless required by applicable law or agreed to in writing, software
elessair 0:f269e3021894 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
elessair 0:f269e3021894 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
elessair 0:f269e3021894 16 * See the License for the specific language governing permissions and
elessair 0:f269e3021894 17 * limitations under the License.
elessair 0:f269e3021894 18 *
elessair 0:f269e3021894 19 * This file is part of mbed TLS (https://tls.mbed.org)
elessair 0:f269e3021894 20 */
elessair 0:f269e3021894 21 /*
elessair 0:f269e3021894 22 * The PKCS #12 Personal Information Exchange Syntax Standard v1.1
elessair 0:f269e3021894 23 *
elessair 0:f269e3021894 24 * http://www.rsa.com/rsalabs/pkcs/files/h11301-wp-pkcs-12v1-1-personal-information-exchange-syntax.pdf
elessair 0:f269e3021894 25 * ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-12/pkcs-12v1-1.asn
elessair 0:f269e3021894 26 */
elessair 0:f269e3021894 27
elessair 0:f269e3021894 28 #if !defined(MBEDTLS_CONFIG_FILE)
elessair 0:f269e3021894 29 #include "mbedtls/config.h"
elessair 0:f269e3021894 30 #else
elessair 0:f269e3021894 31 #include MBEDTLS_CONFIG_FILE
elessair 0:f269e3021894 32 #endif
elessair 0:f269e3021894 33
elessair 0:f269e3021894 34 #if defined(MBEDTLS_PKCS12_C)
elessair 0:f269e3021894 35
elessair 0:f269e3021894 36 #include "mbedtls/pkcs12.h"
elessair 0:f269e3021894 37 #include "mbedtls/asn1.h"
elessair 0:f269e3021894 38 #include "mbedtls/cipher.h"
elessair 0:f269e3021894 39
elessair 0:f269e3021894 40 #include <string.h>
elessair 0:f269e3021894 41
elessair 0:f269e3021894 42 #if defined(MBEDTLS_ARC4_C)
elessair 0:f269e3021894 43 #include "mbedtls/arc4.h"
elessair 0:f269e3021894 44 #endif
elessair 0:f269e3021894 45
elessair 0:f269e3021894 46 #if defined(MBEDTLS_DES_C)
elessair 0:f269e3021894 47 #include "mbedtls/des.h"
elessair 0:f269e3021894 48 #endif
elessair 0:f269e3021894 49
elessair 0:f269e3021894 50 /* Implementation that should never be optimized out by the compiler */
elessair 0:f269e3021894 51 static void mbedtls_zeroize( void *v, size_t n ) {
elessair 0:f269e3021894 52 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
elessair 0:f269e3021894 53 }
elessair 0:f269e3021894 54
elessair 0:f269e3021894 55 static int pkcs12_parse_pbe_params( mbedtls_asn1_buf *params,
elessair 0:f269e3021894 56 mbedtls_asn1_buf *salt, int *iterations )
elessair 0:f269e3021894 57 {
elessair 0:f269e3021894 58 int ret;
elessair 0:f269e3021894 59 unsigned char **p = &params->p;
elessair 0:f269e3021894 60 const unsigned char *end = params->p + params->len;
elessair 0:f269e3021894 61
elessair 0:f269e3021894 62 /*
elessair 0:f269e3021894 63 * pkcs-12PbeParams ::= SEQUENCE {
elessair 0:f269e3021894 64 * salt OCTET STRING,
elessair 0:f269e3021894 65 * iterations INTEGER
elessair 0:f269e3021894 66 * }
elessair 0:f269e3021894 67 *
elessair 0:f269e3021894 68 */
elessair 0:f269e3021894 69 if( params->tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) )
elessair 0:f269e3021894 70 return( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT +
elessair 0:f269e3021894 71 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
elessair 0:f269e3021894 72
elessair 0:f269e3021894 73 if( ( ret = mbedtls_asn1_get_tag( p, end, &salt->len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
elessair 0:f269e3021894 74 return( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT + ret );
elessair 0:f269e3021894 75
elessair 0:f269e3021894 76 salt->p = *p;
elessair 0:f269e3021894 77 *p += salt->len;
elessair 0:f269e3021894 78
elessair 0:f269e3021894 79 if( ( ret = mbedtls_asn1_get_int( p, end, iterations ) ) != 0 )
elessair 0:f269e3021894 80 return( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT + ret );
elessair 0:f269e3021894 81
elessair 0:f269e3021894 82 if( *p != end )
elessair 0:f269e3021894 83 return( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT +
elessair 0:f269e3021894 84 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
elessair 0:f269e3021894 85
elessair 0:f269e3021894 86 return( 0 );
elessair 0:f269e3021894 87 }
elessair 0:f269e3021894 88
elessair 0:f269e3021894 89 #define PKCS12_MAX_PWDLEN 128
elessair 0:f269e3021894 90
elessair 0:f269e3021894 91 static int pkcs12_pbe_derive_key_iv( mbedtls_asn1_buf *pbe_params, mbedtls_md_type_t md_type,
elessair 0:f269e3021894 92 const unsigned char *pwd, size_t pwdlen,
elessair 0:f269e3021894 93 unsigned char *key, size_t keylen,
elessair 0:f269e3021894 94 unsigned char *iv, size_t ivlen )
elessair 0:f269e3021894 95 {
elessair 0:f269e3021894 96 int ret, iterations = 0;
elessair 0:f269e3021894 97 mbedtls_asn1_buf salt;
elessair 0:f269e3021894 98 size_t i;
elessair 0:f269e3021894 99 unsigned char unipwd[PKCS12_MAX_PWDLEN * 2 + 2];
elessair 0:f269e3021894 100
elessair 0:f269e3021894 101 if( pwdlen > PKCS12_MAX_PWDLEN )
elessair 0:f269e3021894 102 return( MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA );
elessair 0:f269e3021894 103
elessair 0:f269e3021894 104 memset( &salt, 0, sizeof(mbedtls_asn1_buf) );
elessair 0:f269e3021894 105 memset( &unipwd, 0, sizeof(unipwd) );
elessair 0:f269e3021894 106
elessair 0:f269e3021894 107 if( ( ret = pkcs12_parse_pbe_params( pbe_params, &salt,
elessair 0:f269e3021894 108 &iterations ) ) != 0 )
elessair 0:f269e3021894 109 return( ret );
elessair 0:f269e3021894 110
elessair 0:f269e3021894 111 for( i = 0; i < pwdlen; i++ )
elessair 0:f269e3021894 112 unipwd[i * 2 + 1] = pwd[i];
elessair 0:f269e3021894 113
elessair 0:f269e3021894 114 if( ( ret = mbedtls_pkcs12_derivation( key, keylen, unipwd, pwdlen * 2 + 2,
elessair 0:f269e3021894 115 salt.p, salt.len, md_type,
elessair 0:f269e3021894 116 MBEDTLS_PKCS12_DERIVE_KEY, iterations ) ) != 0 )
elessair 0:f269e3021894 117 {
elessair 0:f269e3021894 118 return( ret );
elessair 0:f269e3021894 119 }
elessair 0:f269e3021894 120
elessair 0:f269e3021894 121 if( iv == NULL || ivlen == 0 )
elessair 0:f269e3021894 122 return( 0 );
elessair 0:f269e3021894 123
elessair 0:f269e3021894 124 if( ( ret = mbedtls_pkcs12_derivation( iv, ivlen, unipwd, pwdlen * 2 + 2,
elessair 0:f269e3021894 125 salt.p, salt.len, md_type,
elessair 0:f269e3021894 126 MBEDTLS_PKCS12_DERIVE_IV, iterations ) ) != 0 )
elessair 0:f269e3021894 127 {
elessair 0:f269e3021894 128 return( ret );
elessair 0:f269e3021894 129 }
elessair 0:f269e3021894 130 return( 0 );
elessair 0:f269e3021894 131 }
elessair 0:f269e3021894 132
elessair 0:f269e3021894 133 #undef PKCS12_MAX_PWDLEN
elessair 0:f269e3021894 134
elessair 0:f269e3021894 135 int mbedtls_pkcs12_pbe_sha1_rc4_128( mbedtls_asn1_buf *pbe_params, int mode,
elessair 0:f269e3021894 136 const unsigned char *pwd, size_t pwdlen,
elessair 0:f269e3021894 137 const unsigned char *data, size_t len,
elessair 0:f269e3021894 138 unsigned char *output )
elessair 0:f269e3021894 139 {
elessair 0:f269e3021894 140 #if !defined(MBEDTLS_ARC4_C)
elessair 0:f269e3021894 141 ((void) pbe_params);
elessair 0:f269e3021894 142 ((void) mode);
elessair 0:f269e3021894 143 ((void) pwd);
elessair 0:f269e3021894 144 ((void) pwdlen);
elessair 0:f269e3021894 145 ((void) data);
elessair 0:f269e3021894 146 ((void) len);
elessair 0:f269e3021894 147 ((void) output);
elessair 0:f269e3021894 148 return( MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE );
elessair 0:f269e3021894 149 #else
elessair 0:f269e3021894 150 int ret;
elessair 0:f269e3021894 151 unsigned char key[16];
elessair 0:f269e3021894 152 mbedtls_arc4_context ctx;
elessair 0:f269e3021894 153 ((void) mode);
elessair 0:f269e3021894 154
elessair 0:f269e3021894 155 mbedtls_arc4_init( &ctx );
elessair 0:f269e3021894 156
elessair 0:f269e3021894 157 if( ( ret = pkcs12_pbe_derive_key_iv( pbe_params, MBEDTLS_MD_SHA1,
elessair 0:f269e3021894 158 pwd, pwdlen,
elessair 0:f269e3021894 159 key, 16, NULL, 0 ) ) != 0 )
elessair 0:f269e3021894 160 {
elessair 0:f269e3021894 161 return( ret );
elessair 0:f269e3021894 162 }
elessair 0:f269e3021894 163
elessair 0:f269e3021894 164 mbedtls_arc4_setup( &ctx, key, 16 );
elessair 0:f269e3021894 165 if( ( ret = mbedtls_arc4_crypt( &ctx, len, data, output ) ) != 0 )
elessair 0:f269e3021894 166 goto exit;
elessair 0:f269e3021894 167
elessair 0:f269e3021894 168 exit:
elessair 0:f269e3021894 169 mbedtls_zeroize( key, sizeof( key ) );
elessair 0:f269e3021894 170 mbedtls_arc4_free( &ctx );
elessair 0:f269e3021894 171
elessair 0:f269e3021894 172 return( ret );
elessair 0:f269e3021894 173 #endif /* MBEDTLS_ARC4_C */
elessair 0:f269e3021894 174 }
elessair 0:f269e3021894 175
elessair 0:f269e3021894 176 int mbedtls_pkcs12_pbe( mbedtls_asn1_buf *pbe_params, int mode,
elessair 0:f269e3021894 177 mbedtls_cipher_type_t cipher_type, mbedtls_md_type_t md_type,
elessair 0:f269e3021894 178 const unsigned char *pwd, size_t pwdlen,
elessair 0:f269e3021894 179 const unsigned char *data, size_t len,
elessair 0:f269e3021894 180 unsigned char *output )
elessair 0:f269e3021894 181 {
elessair 0:f269e3021894 182 int ret, keylen = 0;
elessair 0:f269e3021894 183 unsigned char key[32];
elessair 0:f269e3021894 184 unsigned char iv[16];
elessair 0:f269e3021894 185 const mbedtls_cipher_info_t *cipher_info;
elessair 0:f269e3021894 186 mbedtls_cipher_context_t cipher_ctx;
elessair 0:f269e3021894 187 size_t olen = 0;
elessair 0:f269e3021894 188
elessair 0:f269e3021894 189 cipher_info = mbedtls_cipher_info_from_type( cipher_type );
elessair 0:f269e3021894 190 if( cipher_info == NULL )
elessair 0:f269e3021894 191 return( MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE );
elessair 0:f269e3021894 192
elessair 0:f269e3021894 193 keylen = cipher_info->key_bitlen / 8;
elessair 0:f269e3021894 194
elessair 0:f269e3021894 195 if( ( ret = pkcs12_pbe_derive_key_iv( pbe_params, md_type, pwd, pwdlen,
elessair 0:f269e3021894 196 key, keylen,
elessair 0:f269e3021894 197 iv, cipher_info->iv_size ) ) != 0 )
elessair 0:f269e3021894 198 {
elessair 0:f269e3021894 199 return( ret );
elessair 0:f269e3021894 200 }
elessair 0:f269e3021894 201
elessair 0:f269e3021894 202 mbedtls_cipher_init( &cipher_ctx );
elessair 0:f269e3021894 203
elessair 0:f269e3021894 204 if( ( ret = mbedtls_cipher_setup( &cipher_ctx, cipher_info ) ) != 0 )
elessair 0:f269e3021894 205 goto exit;
elessair 0:f269e3021894 206
elessair 0:f269e3021894 207 if( ( ret = mbedtls_cipher_setkey( &cipher_ctx, key, 8 * keylen, (mbedtls_operation_t) mode ) ) != 0 )
elessair 0:f269e3021894 208 goto exit;
elessair 0:f269e3021894 209
elessair 0:f269e3021894 210 if( ( ret = mbedtls_cipher_set_iv( &cipher_ctx, iv, cipher_info->iv_size ) ) != 0 )
elessair 0:f269e3021894 211 goto exit;
elessair 0:f269e3021894 212
elessair 0:f269e3021894 213 if( ( ret = mbedtls_cipher_reset( &cipher_ctx ) ) != 0 )
elessair 0:f269e3021894 214 goto exit;
elessair 0:f269e3021894 215
elessair 0:f269e3021894 216 if( ( ret = mbedtls_cipher_update( &cipher_ctx, data, len,
elessair 0:f269e3021894 217 output, &olen ) ) != 0 )
elessair 0:f269e3021894 218 {
elessair 0:f269e3021894 219 goto exit;
elessair 0:f269e3021894 220 }
elessair 0:f269e3021894 221
elessair 0:f269e3021894 222 if( ( ret = mbedtls_cipher_finish( &cipher_ctx, output + olen, &olen ) ) != 0 )
elessair 0:f269e3021894 223 ret = MBEDTLS_ERR_PKCS12_PASSWORD_MISMATCH;
elessair 0:f269e3021894 224
elessair 0:f269e3021894 225 exit:
elessair 0:f269e3021894 226 mbedtls_zeroize( key, sizeof( key ) );
elessair 0:f269e3021894 227 mbedtls_zeroize( iv, sizeof( iv ) );
elessair 0:f269e3021894 228 mbedtls_cipher_free( &cipher_ctx );
elessair 0:f269e3021894 229
elessair 0:f269e3021894 230 return( ret );
elessair 0:f269e3021894 231 }
elessair 0:f269e3021894 232
elessair 0:f269e3021894 233 static void pkcs12_fill_buffer( unsigned char *data, size_t data_len,
elessair 0:f269e3021894 234 const unsigned char *filler, size_t fill_len )
elessair 0:f269e3021894 235 {
elessair 0:f269e3021894 236 unsigned char *p = data;
elessair 0:f269e3021894 237 size_t use_len;
elessair 0:f269e3021894 238
elessair 0:f269e3021894 239 while( data_len > 0 )
elessair 0:f269e3021894 240 {
elessair 0:f269e3021894 241 use_len = ( data_len > fill_len ) ? fill_len : data_len;
elessair 0:f269e3021894 242 memcpy( p, filler, use_len );
elessair 0:f269e3021894 243 p += use_len;
elessair 0:f269e3021894 244 data_len -= use_len;
elessair 0:f269e3021894 245 }
elessair 0:f269e3021894 246 }
elessair 0:f269e3021894 247
elessair 0:f269e3021894 248 int mbedtls_pkcs12_derivation( unsigned char *data, size_t datalen,
elessair 0:f269e3021894 249 const unsigned char *pwd, size_t pwdlen,
elessair 0:f269e3021894 250 const unsigned char *salt, size_t saltlen,
elessair 0:f269e3021894 251 mbedtls_md_type_t md_type, int id, int iterations )
elessair 0:f269e3021894 252 {
elessair 0:f269e3021894 253 int ret;
elessair 0:f269e3021894 254 unsigned int j;
elessair 0:f269e3021894 255
elessair 0:f269e3021894 256 unsigned char diversifier[128];
elessair 0:f269e3021894 257 unsigned char salt_block[128], pwd_block[128], hash_block[128];
elessair 0:f269e3021894 258 unsigned char hash_output[MBEDTLS_MD_MAX_SIZE];
elessair 0:f269e3021894 259 unsigned char *p;
elessair 0:f269e3021894 260 unsigned char c;
elessair 0:f269e3021894 261
elessair 0:f269e3021894 262 size_t hlen, use_len, v, i;
elessair 0:f269e3021894 263
elessair 0:f269e3021894 264 const mbedtls_md_info_t *md_info;
elessair 0:f269e3021894 265 mbedtls_md_context_t md_ctx;
elessair 0:f269e3021894 266
elessair 0:f269e3021894 267 // This version only allows max of 64 bytes of password or salt
elessair 0:f269e3021894 268 if( datalen > 128 || pwdlen > 64 || saltlen > 64 )
elessair 0:f269e3021894 269 return( MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA );
elessair 0:f269e3021894 270
elessair 0:f269e3021894 271 md_info = mbedtls_md_info_from_type( md_type );
elessair 0:f269e3021894 272 if( md_info == NULL )
elessair 0:f269e3021894 273 return( MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE );
elessair 0:f269e3021894 274
elessair 0:f269e3021894 275 mbedtls_md_init( &md_ctx );
elessair 0:f269e3021894 276
elessair 0:f269e3021894 277 if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 0 ) ) != 0 )
elessair 0:f269e3021894 278 return( ret );
elessair 0:f269e3021894 279 hlen = mbedtls_md_get_size( md_info );
elessair 0:f269e3021894 280
elessair 0:f269e3021894 281 if( hlen <= 32 )
elessair 0:f269e3021894 282 v = 64;
elessair 0:f269e3021894 283 else
elessair 0:f269e3021894 284 v = 128;
elessair 0:f269e3021894 285
elessair 0:f269e3021894 286 memset( diversifier, (unsigned char) id, v );
elessair 0:f269e3021894 287
elessair 0:f269e3021894 288 pkcs12_fill_buffer( salt_block, v, salt, saltlen );
elessair 0:f269e3021894 289 pkcs12_fill_buffer( pwd_block, v, pwd, pwdlen );
elessair 0:f269e3021894 290
elessair 0:f269e3021894 291 p = data;
elessair 0:f269e3021894 292 while( datalen > 0 )
elessair 0:f269e3021894 293 {
elessair 0:f269e3021894 294 // Calculate hash( diversifier || salt_block || pwd_block )
elessair 0:f269e3021894 295 if( ( ret = mbedtls_md_starts( &md_ctx ) ) != 0 )
elessair 0:f269e3021894 296 goto exit;
elessair 0:f269e3021894 297
elessair 0:f269e3021894 298 if( ( ret = mbedtls_md_update( &md_ctx, diversifier, v ) ) != 0 )
elessair 0:f269e3021894 299 goto exit;
elessair 0:f269e3021894 300
elessair 0:f269e3021894 301 if( ( ret = mbedtls_md_update( &md_ctx, salt_block, v ) ) != 0 )
elessair 0:f269e3021894 302 goto exit;
elessair 0:f269e3021894 303
elessair 0:f269e3021894 304 if( ( ret = mbedtls_md_update( &md_ctx, pwd_block, v ) ) != 0 )
elessair 0:f269e3021894 305 goto exit;
elessair 0:f269e3021894 306
elessair 0:f269e3021894 307 if( ( ret = mbedtls_md_finish( &md_ctx, hash_output ) ) != 0 )
elessair 0:f269e3021894 308 goto exit;
elessair 0:f269e3021894 309
elessair 0:f269e3021894 310 // Perform remaining ( iterations - 1 ) recursive hash calculations
elessair 0:f269e3021894 311 for( i = 1; i < (size_t) iterations; i++ )
elessair 0:f269e3021894 312 {
elessair 0:f269e3021894 313 if( ( ret = mbedtls_md( md_info, hash_output, hlen, hash_output ) ) != 0 )
elessair 0:f269e3021894 314 goto exit;
elessair 0:f269e3021894 315 }
elessair 0:f269e3021894 316
elessair 0:f269e3021894 317 use_len = ( datalen > hlen ) ? hlen : datalen;
elessair 0:f269e3021894 318 memcpy( p, hash_output, use_len );
elessair 0:f269e3021894 319 datalen -= use_len;
elessair 0:f269e3021894 320 p += use_len;
elessair 0:f269e3021894 321
elessair 0:f269e3021894 322 if( datalen == 0 )
elessair 0:f269e3021894 323 break;
elessair 0:f269e3021894 324
elessair 0:f269e3021894 325 // Concatenating copies of hash_output into hash_block (B)
elessair 0:f269e3021894 326 pkcs12_fill_buffer( hash_block, v, hash_output, hlen );
elessair 0:f269e3021894 327
elessair 0:f269e3021894 328 // B += 1
elessair 0:f269e3021894 329 for( i = v; i > 0; i-- )
elessair 0:f269e3021894 330 if( ++hash_block[i - 1] != 0 )
elessair 0:f269e3021894 331 break;
elessair 0:f269e3021894 332
elessair 0:f269e3021894 333 // salt_block += B
elessair 0:f269e3021894 334 c = 0;
elessair 0:f269e3021894 335 for( i = v; i > 0; i-- )
elessair 0:f269e3021894 336 {
elessair 0:f269e3021894 337 j = salt_block[i - 1] + hash_block[i - 1] + c;
elessair 0:f269e3021894 338 c = (unsigned char) (j >> 8);
elessair 0:f269e3021894 339 salt_block[i - 1] = j & 0xFF;
elessair 0:f269e3021894 340 }
elessair 0:f269e3021894 341
elessair 0:f269e3021894 342 // pwd_block += B
elessair 0:f269e3021894 343 c = 0;
elessair 0:f269e3021894 344 for( i = v; i > 0; i-- )
elessair 0:f269e3021894 345 {
elessair 0:f269e3021894 346 j = pwd_block[i - 1] + hash_block[i - 1] + c;
elessair 0:f269e3021894 347 c = (unsigned char) (j >> 8);
elessair 0:f269e3021894 348 pwd_block[i - 1] = j & 0xFF;
elessair 0:f269e3021894 349 }
elessair 0:f269e3021894 350 }
elessair 0:f269e3021894 351
elessair 0:f269e3021894 352 ret = 0;
elessair 0:f269e3021894 353
elessair 0:f269e3021894 354 exit:
elessair 0:f269e3021894 355 mbedtls_zeroize( salt_block, sizeof( salt_block ) );
elessair 0:f269e3021894 356 mbedtls_zeroize( pwd_block, sizeof( pwd_block ) );
elessair 0:f269e3021894 357 mbedtls_zeroize( hash_block, sizeof( hash_block ) );
elessair 0:f269e3021894 358 mbedtls_zeroize( hash_output, sizeof( hash_output ) );
elessair 0:f269e3021894 359
elessair 0:f269e3021894 360 mbedtls_md_free( &md_ctx );
elessair 0:f269e3021894 361
elessair 0:f269e3021894 362 return( ret );
elessair 0:f269e3021894 363 }
elessair 0:f269e3021894 364
elessair 0:f269e3021894 365 #endif /* MBEDTLS_PKCS12_C */