EL4121 Embedded System / mbed-os

mbed-os

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features/mbedtls/src/pkcs12.c@0:b74591d5ab33, 2017-12-11 (annotated)

Committer:
be_bryan
Date:
Mon Dec 11 17:54:04 2017 +0000
Revision:
0:b74591d5ab33
motor ++

Who changed what in which revision?

UserRevisionLine numberNew contents of line
be_bryan 0:b74591d5ab33 1 /*
be_bryan 0:b74591d5ab33 2 * PKCS#12 Personal Information Exchange Syntax
be_bryan 0:b74591d5ab33 3 *
be_bryan 0:b74591d5ab33 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
be_bryan 0:b74591d5ab33 5 * SPDX-License-Identifier: Apache-2.0
be_bryan 0:b74591d5ab33 6 *
be_bryan 0:b74591d5ab33 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
be_bryan 0:b74591d5ab33 8 * not use this file except in compliance with the License.
be_bryan 0:b74591d5ab33 9 * You may obtain a copy of the License at
be_bryan 0:b74591d5ab33 10 *
be_bryan 0:b74591d5ab33 11 * http://www.apache.org/licenses/LICENSE-2.0
be_bryan 0:b74591d5ab33 12 *
be_bryan 0:b74591d5ab33 13 * Unless required by applicable law or agreed to in writing, software
be_bryan 0:b74591d5ab33 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
be_bryan 0:b74591d5ab33 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
be_bryan 0:b74591d5ab33 16 * See the License for the specific language governing permissions and
be_bryan 0:b74591d5ab33 17 * limitations under the License.
be_bryan 0:b74591d5ab33 18 *
be_bryan 0:b74591d5ab33 19 * This file is part of mbed TLS (https://tls.mbed.org)
be_bryan 0:b74591d5ab33 20 */
be_bryan 0:b74591d5ab33 21 /*
be_bryan 0:b74591d5ab33 22 * The PKCS #12 Personal Information Exchange Syntax Standard v1.1
be_bryan 0:b74591d5ab33 23 *
be_bryan 0:b74591d5ab33 24 * http://www.rsa.com/rsalabs/pkcs/files/h11301-wp-pkcs-12v1-1-personal-information-exchange-syntax.pdf
be_bryan 0:b74591d5ab33 25 * ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-12/pkcs-12v1-1.asn
be_bryan 0:b74591d5ab33 26 */
be_bryan 0:b74591d5ab33 27
be_bryan 0:b74591d5ab33 28 #if !defined(MBEDTLS_CONFIG_FILE)
be_bryan 0:b74591d5ab33 29 #include "mbedtls/config.h"
be_bryan 0:b74591d5ab33 30 #else
be_bryan 0:b74591d5ab33 31 #include MBEDTLS_CONFIG_FILE
be_bryan 0:b74591d5ab33 32 #endif
be_bryan 0:b74591d5ab33 33
be_bryan 0:b74591d5ab33 34 #if defined(MBEDTLS_PKCS12_C)
be_bryan 0:b74591d5ab33 35
be_bryan 0:b74591d5ab33 36 #include "mbedtls/pkcs12.h"
be_bryan 0:b74591d5ab33 37 #include "mbedtls/asn1.h"
be_bryan 0:b74591d5ab33 38 #include "mbedtls/cipher.h"
be_bryan 0:b74591d5ab33 39
be_bryan 0:b74591d5ab33 40 #include <string.h>
be_bryan 0:b74591d5ab33 41
be_bryan 0:b74591d5ab33 42 #if defined(MBEDTLS_ARC4_C)
be_bryan 0:b74591d5ab33 43 #include "mbedtls/arc4.h"
be_bryan 0:b74591d5ab33 44 #endif
be_bryan 0:b74591d5ab33 45
be_bryan 0:b74591d5ab33 46 #if defined(MBEDTLS_DES_C)
be_bryan 0:b74591d5ab33 47 #include "mbedtls/des.h"
be_bryan 0:b74591d5ab33 48 #endif
be_bryan 0:b74591d5ab33 49
be_bryan 0:b74591d5ab33 50 /* Implementation that should never be optimized out by the compiler */
be_bryan 0:b74591d5ab33 51 static void mbedtls_zeroize( void *v, size_t n ) {
be_bryan 0:b74591d5ab33 52 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
be_bryan 0:b74591d5ab33 53 }
be_bryan 0:b74591d5ab33 54
be_bryan 0:b74591d5ab33 55 static int pkcs12_parse_pbe_params( mbedtls_asn1_buf *params,
be_bryan 0:b74591d5ab33 56 mbedtls_asn1_buf *salt, int *iterations )
be_bryan 0:b74591d5ab33 57 {
be_bryan 0:b74591d5ab33 58 int ret;
be_bryan 0:b74591d5ab33 59 unsigned char **p = &params->p;
be_bryan 0:b74591d5ab33 60 const unsigned char *end = params->p + params->len;
be_bryan 0:b74591d5ab33 61
be_bryan 0:b74591d5ab33 62 /*
be_bryan 0:b74591d5ab33 63 * pkcs-12PbeParams ::= SEQUENCE {
be_bryan 0:b74591d5ab33 64 * salt OCTET STRING,
be_bryan 0:b74591d5ab33 65 * iterations INTEGER
be_bryan 0:b74591d5ab33 66 * }
be_bryan 0:b74591d5ab33 67 *
be_bryan 0:b74591d5ab33 68 */
be_bryan 0:b74591d5ab33 69 if( params->tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) )
be_bryan 0:b74591d5ab33 70 return( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT +
be_bryan 0:b74591d5ab33 71 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
be_bryan 0:b74591d5ab33 72
be_bryan 0:b74591d5ab33 73 if( ( ret = mbedtls_asn1_get_tag( p, end, &salt->len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
be_bryan 0:b74591d5ab33 74 return( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT + ret );
be_bryan 0:b74591d5ab33 75
be_bryan 0:b74591d5ab33 76 salt->p = *p;
be_bryan 0:b74591d5ab33 77 *p += salt->len;
be_bryan 0:b74591d5ab33 78
be_bryan 0:b74591d5ab33 79 if( ( ret = mbedtls_asn1_get_int( p, end, iterations ) ) != 0 )
be_bryan 0:b74591d5ab33 80 return( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT + ret );
be_bryan 0:b74591d5ab33 81
be_bryan 0:b74591d5ab33 82 if( *p != end )
be_bryan 0:b74591d5ab33 83 return( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT +
be_bryan 0:b74591d5ab33 84 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
be_bryan 0:b74591d5ab33 85
be_bryan 0:b74591d5ab33 86 return( 0 );
be_bryan 0:b74591d5ab33 87 }
be_bryan 0:b74591d5ab33 88
be_bryan 0:b74591d5ab33 89 #define PKCS12_MAX_PWDLEN 128
be_bryan 0:b74591d5ab33 90
be_bryan 0:b74591d5ab33 91 static int pkcs12_pbe_derive_key_iv( mbedtls_asn1_buf *pbe_params, mbedtls_md_type_t md_type,
be_bryan 0:b74591d5ab33 92 const unsigned char *pwd, size_t pwdlen,
be_bryan 0:b74591d5ab33 93 unsigned char *key, size_t keylen,
be_bryan 0:b74591d5ab33 94 unsigned char *iv, size_t ivlen )
be_bryan 0:b74591d5ab33 95 {
be_bryan 0:b74591d5ab33 96 int ret, iterations = 0;
be_bryan 0:b74591d5ab33 97 mbedtls_asn1_buf salt;
be_bryan 0:b74591d5ab33 98 size_t i;
be_bryan 0:b74591d5ab33 99 unsigned char unipwd[PKCS12_MAX_PWDLEN * 2 + 2];
be_bryan 0:b74591d5ab33 100
be_bryan 0:b74591d5ab33 101 if( pwdlen > PKCS12_MAX_PWDLEN )
be_bryan 0:b74591d5ab33 102 return( MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA );
be_bryan 0:b74591d5ab33 103
be_bryan 0:b74591d5ab33 104 memset( &salt, 0, sizeof(mbedtls_asn1_buf) );
be_bryan 0:b74591d5ab33 105 memset( &unipwd, 0, sizeof(unipwd) );
be_bryan 0:b74591d5ab33 106
be_bryan 0:b74591d5ab33 107 if( ( ret = pkcs12_parse_pbe_params( pbe_params, &salt,
be_bryan 0:b74591d5ab33 108 &iterations ) ) != 0 )
be_bryan 0:b74591d5ab33 109 return( ret );
be_bryan 0:b74591d5ab33 110
be_bryan 0:b74591d5ab33 111 for( i = 0; i < pwdlen; i++ )
be_bryan 0:b74591d5ab33 112 unipwd[i * 2 + 1] = pwd[i];
be_bryan 0:b74591d5ab33 113
be_bryan 0:b74591d5ab33 114 if( ( ret = mbedtls_pkcs12_derivation( key, keylen, unipwd, pwdlen * 2 + 2,
be_bryan 0:b74591d5ab33 115 salt.p, salt.len, md_type,
be_bryan 0:b74591d5ab33 116 MBEDTLS_PKCS12_DERIVE_KEY, iterations ) ) != 0 )
be_bryan 0:b74591d5ab33 117 {
be_bryan 0:b74591d5ab33 118 return( ret );
be_bryan 0:b74591d5ab33 119 }
be_bryan 0:b74591d5ab33 120
be_bryan 0:b74591d5ab33 121 if( iv == NULL || ivlen == 0 )
be_bryan 0:b74591d5ab33 122 return( 0 );
be_bryan 0:b74591d5ab33 123
be_bryan 0:b74591d5ab33 124 if( ( ret = mbedtls_pkcs12_derivation( iv, ivlen, unipwd, pwdlen * 2 + 2,
be_bryan 0:b74591d5ab33 125 salt.p, salt.len, md_type,
be_bryan 0:b74591d5ab33 126 MBEDTLS_PKCS12_DERIVE_IV, iterations ) ) != 0 )
be_bryan 0:b74591d5ab33 127 {
be_bryan 0:b74591d5ab33 128 return( ret );
be_bryan 0:b74591d5ab33 129 }
be_bryan 0:b74591d5ab33 130 return( 0 );
be_bryan 0:b74591d5ab33 131 }
be_bryan 0:b74591d5ab33 132
be_bryan 0:b74591d5ab33 133 #undef PKCS12_MAX_PWDLEN
be_bryan 0:b74591d5ab33 134
be_bryan 0:b74591d5ab33 135 int mbedtls_pkcs12_pbe_sha1_rc4_128( mbedtls_asn1_buf *pbe_params, int mode,
be_bryan 0:b74591d5ab33 136 const unsigned char *pwd, size_t pwdlen,
be_bryan 0:b74591d5ab33 137 const unsigned char *data, size_t len,
be_bryan 0:b74591d5ab33 138 unsigned char *output )
be_bryan 0:b74591d5ab33 139 {
be_bryan 0:b74591d5ab33 140 #if !defined(MBEDTLS_ARC4_C)
be_bryan 0:b74591d5ab33 141 ((void) pbe_params);
be_bryan 0:b74591d5ab33 142 ((void) mode);
be_bryan 0:b74591d5ab33 143 ((void) pwd);
be_bryan 0:b74591d5ab33 144 ((void) pwdlen);
be_bryan 0:b74591d5ab33 145 ((void) data);
be_bryan 0:b74591d5ab33 146 ((void) len);
be_bryan 0:b74591d5ab33 147 ((void) output);
be_bryan 0:b74591d5ab33 148 return( MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE );
be_bryan 0:b74591d5ab33 149 #else
be_bryan 0:b74591d5ab33 150 int ret;
be_bryan 0:b74591d5ab33 151 unsigned char key[16];
be_bryan 0:b74591d5ab33 152 mbedtls_arc4_context ctx;
be_bryan 0:b74591d5ab33 153 ((void) mode);
be_bryan 0:b74591d5ab33 154
be_bryan 0:b74591d5ab33 155 mbedtls_arc4_init( &ctx );
be_bryan 0:b74591d5ab33 156
be_bryan 0:b74591d5ab33 157 if( ( ret = pkcs12_pbe_derive_key_iv( pbe_params, MBEDTLS_MD_SHA1,
be_bryan 0:b74591d5ab33 158 pwd, pwdlen,
be_bryan 0:b74591d5ab33 159 key, 16, NULL, 0 ) ) != 0 )
be_bryan 0:b74591d5ab33 160 {
be_bryan 0:b74591d5ab33 161 return( ret );
be_bryan 0:b74591d5ab33 162 }
be_bryan 0:b74591d5ab33 163
be_bryan 0:b74591d5ab33 164 mbedtls_arc4_setup( &ctx, key, 16 );
be_bryan 0:b74591d5ab33 165 if( ( ret = mbedtls_arc4_crypt( &ctx, len, data, output ) ) != 0 )
be_bryan 0:b74591d5ab33 166 goto exit;
be_bryan 0:b74591d5ab33 167
be_bryan 0:b74591d5ab33 168 exit:
be_bryan 0:b74591d5ab33 169 mbedtls_zeroize( key, sizeof( key ) );
be_bryan 0:b74591d5ab33 170 mbedtls_arc4_free( &ctx );
be_bryan 0:b74591d5ab33 171
be_bryan 0:b74591d5ab33 172 return( ret );
be_bryan 0:b74591d5ab33 173 #endif /* MBEDTLS_ARC4_C */
be_bryan 0:b74591d5ab33 174 }
be_bryan 0:b74591d5ab33 175
be_bryan 0:b74591d5ab33 176 int mbedtls_pkcs12_pbe( mbedtls_asn1_buf *pbe_params, int mode,
be_bryan 0:b74591d5ab33 177 mbedtls_cipher_type_t cipher_type, mbedtls_md_type_t md_type,
be_bryan 0:b74591d5ab33 178 const unsigned char *pwd, size_t pwdlen,
be_bryan 0:b74591d5ab33 179 const unsigned char *data, size_t len,
be_bryan 0:b74591d5ab33 180 unsigned char *output )
be_bryan 0:b74591d5ab33 181 {
be_bryan 0:b74591d5ab33 182 int ret, keylen = 0;
be_bryan 0:b74591d5ab33 183 unsigned char key[32];
be_bryan 0:b74591d5ab33 184 unsigned char iv[16];
be_bryan 0:b74591d5ab33 185 const mbedtls_cipher_info_t *cipher_info;
be_bryan 0:b74591d5ab33 186 mbedtls_cipher_context_t cipher_ctx;
be_bryan 0:b74591d5ab33 187 size_t olen = 0;
be_bryan 0:b74591d5ab33 188
be_bryan 0:b74591d5ab33 189 cipher_info = mbedtls_cipher_info_from_type( cipher_type );
be_bryan 0:b74591d5ab33 190 if( cipher_info == NULL )
be_bryan 0:b74591d5ab33 191 return( MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE );
be_bryan 0:b74591d5ab33 192
be_bryan 0:b74591d5ab33 193 keylen = cipher_info->key_bitlen / 8;
be_bryan 0:b74591d5ab33 194
be_bryan 0:b74591d5ab33 195 if( ( ret = pkcs12_pbe_derive_key_iv( pbe_params, md_type, pwd, pwdlen,
be_bryan 0:b74591d5ab33 196 key, keylen,
be_bryan 0:b74591d5ab33 197 iv, cipher_info->iv_size ) ) != 0 )
be_bryan 0:b74591d5ab33 198 {
be_bryan 0:b74591d5ab33 199 return( ret );
be_bryan 0:b74591d5ab33 200 }
be_bryan 0:b74591d5ab33 201
be_bryan 0:b74591d5ab33 202 mbedtls_cipher_init( &cipher_ctx );
be_bryan 0:b74591d5ab33 203
be_bryan 0:b74591d5ab33 204 if( ( ret = mbedtls_cipher_setup( &cipher_ctx, cipher_info ) ) != 0 )
be_bryan 0:b74591d5ab33 205 goto exit;
be_bryan 0:b74591d5ab33 206
be_bryan 0:b74591d5ab33 207 if( ( ret = mbedtls_cipher_setkey( &cipher_ctx, key, 8 * keylen, (mbedtls_operation_t) mode ) ) != 0 )
be_bryan 0:b74591d5ab33 208 goto exit;
be_bryan 0:b74591d5ab33 209
be_bryan 0:b74591d5ab33 210 if( ( ret = mbedtls_cipher_set_iv( &cipher_ctx, iv, cipher_info->iv_size ) ) != 0 )
be_bryan 0:b74591d5ab33 211 goto exit;
be_bryan 0:b74591d5ab33 212
be_bryan 0:b74591d5ab33 213 if( ( ret = mbedtls_cipher_reset( &cipher_ctx ) ) != 0 )
be_bryan 0:b74591d5ab33 214 goto exit;
be_bryan 0:b74591d5ab33 215
be_bryan 0:b74591d5ab33 216 if( ( ret = mbedtls_cipher_update( &cipher_ctx, data, len,
be_bryan 0:b74591d5ab33 217 output, &olen ) ) != 0 )
be_bryan 0:b74591d5ab33 218 {
be_bryan 0:b74591d5ab33 219 goto exit;
be_bryan 0:b74591d5ab33 220 }
be_bryan 0:b74591d5ab33 221
be_bryan 0:b74591d5ab33 222 if( ( ret = mbedtls_cipher_finish( &cipher_ctx, output + olen, &olen ) ) != 0 )
be_bryan 0:b74591d5ab33 223 ret = MBEDTLS_ERR_PKCS12_PASSWORD_MISMATCH;
be_bryan 0:b74591d5ab33 224
be_bryan 0:b74591d5ab33 225 exit:
be_bryan 0:b74591d5ab33 226 mbedtls_zeroize( key, sizeof( key ) );
be_bryan 0:b74591d5ab33 227 mbedtls_zeroize( iv, sizeof( iv ) );
be_bryan 0:b74591d5ab33 228 mbedtls_cipher_free( &cipher_ctx );
be_bryan 0:b74591d5ab33 229
be_bryan 0:b74591d5ab33 230 return( ret );
be_bryan 0:b74591d5ab33 231 }
be_bryan 0:b74591d5ab33 232
be_bryan 0:b74591d5ab33 233 static void pkcs12_fill_buffer( unsigned char *data, size_t data_len,
be_bryan 0:b74591d5ab33 234 const unsigned char *filler, size_t fill_len )
be_bryan 0:b74591d5ab33 235 {
be_bryan 0:b74591d5ab33 236 unsigned char *p = data;
be_bryan 0:b74591d5ab33 237 size_t use_len;
be_bryan 0:b74591d5ab33 238
be_bryan 0:b74591d5ab33 239 while( data_len > 0 )
be_bryan 0:b74591d5ab33 240 {
be_bryan 0:b74591d5ab33 241 use_len = ( data_len > fill_len ) ? fill_len : data_len;
be_bryan 0:b74591d5ab33 242 memcpy( p, filler, use_len );
be_bryan 0:b74591d5ab33 243 p += use_len;
be_bryan 0:b74591d5ab33 244 data_len -= use_len;
be_bryan 0:b74591d5ab33 245 }
be_bryan 0:b74591d5ab33 246 }
be_bryan 0:b74591d5ab33 247
be_bryan 0:b74591d5ab33 248 int mbedtls_pkcs12_derivation( unsigned char *data, size_t datalen,
be_bryan 0:b74591d5ab33 249 const unsigned char *pwd, size_t pwdlen,
be_bryan 0:b74591d5ab33 250 const unsigned char *salt, size_t saltlen,
be_bryan 0:b74591d5ab33 251 mbedtls_md_type_t md_type, int id, int iterations )
be_bryan 0:b74591d5ab33 252 {
be_bryan 0:b74591d5ab33 253 int ret;
be_bryan 0:b74591d5ab33 254 unsigned int j;
be_bryan 0:b74591d5ab33 255
be_bryan 0:b74591d5ab33 256 unsigned char diversifier[128];
be_bryan 0:b74591d5ab33 257 unsigned char salt_block[128], pwd_block[128], hash_block[128];
be_bryan 0:b74591d5ab33 258 unsigned char hash_output[MBEDTLS_MD_MAX_SIZE];
be_bryan 0:b74591d5ab33 259 unsigned char *p;
be_bryan 0:b74591d5ab33 260 unsigned char c;
be_bryan 0:b74591d5ab33 261
be_bryan 0:b74591d5ab33 262 size_t hlen, use_len, v, i;
be_bryan 0:b74591d5ab33 263
be_bryan 0:b74591d5ab33 264 const mbedtls_md_info_t *md_info;
be_bryan 0:b74591d5ab33 265 mbedtls_md_context_t md_ctx;
be_bryan 0:b74591d5ab33 266
be_bryan 0:b74591d5ab33 267 // This version only allows max of 64 bytes of password or salt
be_bryan 0:b74591d5ab33 268 if( datalen > 128 || pwdlen > 64 || saltlen > 64 )
be_bryan 0:b74591d5ab33 269 return( MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA );
be_bryan 0:b74591d5ab33 270
be_bryan 0:b74591d5ab33 271 md_info = mbedtls_md_info_from_type( md_type );
be_bryan 0:b74591d5ab33 272 if( md_info == NULL )
be_bryan 0:b74591d5ab33 273 return( MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE );
be_bryan 0:b74591d5ab33 274
be_bryan 0:b74591d5ab33 275 mbedtls_md_init( &md_ctx );
be_bryan 0:b74591d5ab33 276
be_bryan 0:b74591d5ab33 277 if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 0 ) ) != 0 )
be_bryan 0:b74591d5ab33 278 return( ret );
be_bryan 0:b74591d5ab33 279 hlen = mbedtls_md_get_size( md_info );
be_bryan 0:b74591d5ab33 280
be_bryan 0:b74591d5ab33 281 if( hlen <= 32 )
be_bryan 0:b74591d5ab33 282 v = 64;
be_bryan 0:b74591d5ab33 283 else
be_bryan 0:b74591d5ab33 284 v = 128;
be_bryan 0:b74591d5ab33 285
be_bryan 0:b74591d5ab33 286 memset( diversifier, (unsigned char) id, v );
be_bryan 0:b74591d5ab33 287
be_bryan 0:b74591d5ab33 288 pkcs12_fill_buffer( salt_block, v, salt, saltlen );
be_bryan 0:b74591d5ab33 289 pkcs12_fill_buffer( pwd_block, v, pwd, pwdlen );
be_bryan 0:b74591d5ab33 290
be_bryan 0:b74591d5ab33 291 p = data;
be_bryan 0:b74591d5ab33 292 while( datalen > 0 )
be_bryan 0:b74591d5ab33 293 {
be_bryan 0:b74591d5ab33 294 // Calculate hash( diversifier || salt_block || pwd_block )
be_bryan 0:b74591d5ab33 295 if( ( ret = mbedtls_md_starts( &md_ctx ) ) != 0 )
be_bryan 0:b74591d5ab33 296 goto exit;
be_bryan 0:b74591d5ab33 297
be_bryan 0:b74591d5ab33 298 if( ( ret = mbedtls_md_update( &md_ctx, diversifier, v ) ) != 0 )
be_bryan 0:b74591d5ab33 299 goto exit;
be_bryan 0:b74591d5ab33 300
be_bryan 0:b74591d5ab33 301 if( ( ret = mbedtls_md_update( &md_ctx, salt_block, v ) ) != 0 )
be_bryan 0:b74591d5ab33 302 goto exit;
be_bryan 0:b74591d5ab33 303
be_bryan 0:b74591d5ab33 304 if( ( ret = mbedtls_md_update( &md_ctx, pwd_block, v ) ) != 0 )
be_bryan 0:b74591d5ab33 305 goto exit;
be_bryan 0:b74591d5ab33 306
be_bryan 0:b74591d5ab33 307 if( ( ret = mbedtls_md_finish( &md_ctx, hash_output ) ) != 0 )
be_bryan 0:b74591d5ab33 308 goto exit;
be_bryan 0:b74591d5ab33 309
be_bryan 0:b74591d5ab33 310 // Perform remaining ( iterations - 1 ) recursive hash calculations
be_bryan 0:b74591d5ab33 311 for( i = 1; i < (size_t) iterations; i++ )
be_bryan 0:b74591d5ab33 312 {
be_bryan 0:b74591d5ab33 313 if( ( ret = mbedtls_md( md_info, hash_output, hlen, hash_output ) ) != 0 )
be_bryan 0:b74591d5ab33 314 goto exit;
be_bryan 0:b74591d5ab33 315 }
be_bryan 0:b74591d5ab33 316
be_bryan 0:b74591d5ab33 317 use_len = ( datalen > hlen ) ? hlen : datalen;
be_bryan 0:b74591d5ab33 318 memcpy( p, hash_output, use_len );
be_bryan 0:b74591d5ab33 319 datalen -= use_len;
be_bryan 0:b74591d5ab33 320 p += use_len;
be_bryan 0:b74591d5ab33 321
be_bryan 0:b74591d5ab33 322 if( datalen == 0 )
be_bryan 0:b74591d5ab33 323 break;
be_bryan 0:b74591d5ab33 324
be_bryan 0:b74591d5ab33 325 // Concatenating copies of hash_output into hash_block (B)
be_bryan 0:b74591d5ab33 326 pkcs12_fill_buffer( hash_block, v, hash_output, hlen );
be_bryan 0:b74591d5ab33 327
be_bryan 0:b74591d5ab33 328 // B += 1
be_bryan 0:b74591d5ab33 329 for( i = v; i > 0; i-- )
be_bryan 0:b74591d5ab33 330 if( ++hash_block[i - 1] != 0 )
be_bryan 0:b74591d5ab33 331 break;
be_bryan 0:b74591d5ab33 332
be_bryan 0:b74591d5ab33 333 // salt_block += B
be_bryan 0:b74591d5ab33 334 c = 0;
be_bryan 0:b74591d5ab33 335 for( i = v; i > 0; i-- )
be_bryan 0:b74591d5ab33 336 {
be_bryan 0:b74591d5ab33 337 j = salt_block[i - 1] + hash_block[i - 1] + c;
be_bryan 0:b74591d5ab33 338 c = (unsigned char) (j >> 8);
be_bryan 0:b74591d5ab33 339 salt_block[i - 1] = j & 0xFF;
be_bryan 0:b74591d5ab33 340 }
be_bryan 0:b74591d5ab33 341
be_bryan 0:b74591d5ab33 342 // pwd_block += B
be_bryan 0:b74591d5ab33 343 c = 0;
be_bryan 0:b74591d5ab33 344 for( i = v; i > 0; i-- )
be_bryan 0:b74591d5ab33 345 {
be_bryan 0:b74591d5ab33 346 j = pwd_block[i - 1] + hash_block[i - 1] + c;
be_bryan 0:b74591d5ab33 347 c = (unsigned char) (j >> 8);
be_bryan 0:b74591d5ab33 348 pwd_block[i - 1] = j & 0xFF;
be_bryan 0:b74591d5ab33 349 }
be_bryan 0:b74591d5ab33 350 }
be_bryan 0:b74591d5ab33 351
be_bryan 0:b74591d5ab33 352 ret = 0;
be_bryan 0:b74591d5ab33 353
be_bryan 0:b74591d5ab33 354 exit:
be_bryan 0:b74591d5ab33 355 mbedtls_zeroize( salt_block, sizeof( salt_block ) );
be_bryan 0:b74591d5ab33 356 mbedtls_zeroize( pwd_block, sizeof( pwd_block ) );
be_bryan 0:b74591d5ab33 357 mbedtls_zeroize( hash_block, sizeof( hash_block ) );
be_bryan 0:b74591d5ab33 358 mbedtls_zeroize( hash_output, sizeof( hash_output ) );
be_bryan 0:b74591d5ab33 359
be_bryan 0:b74591d5ab33 360 mbedtls_md_free( &md_ctx );
be_bryan 0:b74591d5ab33 361
be_bryan 0:b74591d5ab33 362 return( ret );
be_bryan 0:b74591d5ab33 363 }
be_bryan 0:b74591d5ab33 364
be_bryan 0:b74591d5ab33 365 #endif /* MBEDTLS_PKCS12_C */