Greg Steiert / pegasus_dev

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Dependents:   blinky_max32630fthr

features/mbedtls/src/pkcs12.c@0:5c4d7b2438d3, 2016-11-11 (annotated)

Committer:
switches
Date:
Fri Nov 11 20:59:50 2016 +0000
Revision:
0:5c4d7b2438d3
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
switches 0:5c4d7b2438d3 1 /*
switches 0:5c4d7b2438d3 2 * PKCS#12 Personal Information Exchange Syntax
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 * The PKCS #12 Personal Information Exchange Syntax Standard v1.1
switches 0:5c4d7b2438d3 23 *
switches 0:5c4d7b2438d3 24 * http://www.rsa.com/rsalabs/pkcs/files/h11301-wp-pkcs-12v1-1-personal-information-exchange-syntax.pdf
switches 0:5c4d7b2438d3 25 * ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-12/pkcs-12v1-1.asn
switches 0:5c4d7b2438d3 26 */
switches 0:5c4d7b2438d3 27
switches 0:5c4d7b2438d3 28 #if !defined(MBEDTLS_CONFIG_FILE)
switches 0:5c4d7b2438d3 29 #include "mbedtls/config.h"
switches 0:5c4d7b2438d3 30 #else
switches 0:5c4d7b2438d3 31 #include MBEDTLS_CONFIG_FILE
switches 0:5c4d7b2438d3 32 #endif
switches 0:5c4d7b2438d3 33
switches 0:5c4d7b2438d3 34 #if defined(MBEDTLS_PKCS12_C)
switches 0:5c4d7b2438d3 35
switches 0:5c4d7b2438d3 36 #include "mbedtls/pkcs12.h"
switches 0:5c4d7b2438d3 37 #include "mbedtls/asn1.h"
switches 0:5c4d7b2438d3 38 #include "mbedtls/cipher.h"
switches 0:5c4d7b2438d3 39
switches 0:5c4d7b2438d3 40 #include <string.h>
switches 0:5c4d7b2438d3 41
switches 0:5c4d7b2438d3 42 #if defined(MBEDTLS_ARC4_C)
switches 0:5c4d7b2438d3 43 #include "mbedtls/arc4.h"
switches 0:5c4d7b2438d3 44 #endif
switches 0:5c4d7b2438d3 45
switches 0:5c4d7b2438d3 46 #if defined(MBEDTLS_DES_C)
switches 0:5c4d7b2438d3 47 #include "mbedtls/des.h"
switches 0:5c4d7b2438d3 48 #endif
switches 0:5c4d7b2438d3 49
switches 0:5c4d7b2438d3 50 /* Implementation that should never be optimized out by the compiler */
switches 0:5c4d7b2438d3 51 static void mbedtls_zeroize( void *v, size_t n ) {
switches 0:5c4d7b2438d3 52 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
switches 0:5c4d7b2438d3 53 }
switches 0:5c4d7b2438d3 54
switches 0:5c4d7b2438d3 55 static int pkcs12_parse_pbe_params( mbedtls_asn1_buf *params,
switches 0:5c4d7b2438d3 56 mbedtls_asn1_buf *salt, int *iterations )
switches 0:5c4d7b2438d3 57 {
switches 0:5c4d7b2438d3 58 int ret;
switches 0:5c4d7b2438d3 59 unsigned char **p = &params->p;
switches 0:5c4d7b2438d3 60 const unsigned char *end = params->p + params->len;
switches 0:5c4d7b2438d3 61
switches 0:5c4d7b2438d3 62 /*
switches 0:5c4d7b2438d3 63 * pkcs-12PbeParams ::= SEQUENCE {
switches 0:5c4d7b2438d3 64 * salt OCTET STRING,
switches 0:5c4d7b2438d3 65 * iterations INTEGER
switches 0:5c4d7b2438d3 66 * }
switches 0:5c4d7b2438d3 67 *
switches 0:5c4d7b2438d3 68 */
switches 0:5c4d7b2438d3 69 if( params->tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) )
switches 0:5c4d7b2438d3 70 return( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT +
switches 0:5c4d7b2438d3 71 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
switches 0:5c4d7b2438d3 72
switches 0:5c4d7b2438d3 73 if( ( ret = mbedtls_asn1_get_tag( p, end, &salt->len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
switches 0:5c4d7b2438d3 74 return( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT + ret );
switches 0:5c4d7b2438d3 75
switches 0:5c4d7b2438d3 76 salt->p = *p;
switches 0:5c4d7b2438d3 77 *p += salt->len;
switches 0:5c4d7b2438d3 78
switches 0:5c4d7b2438d3 79 if( ( ret = mbedtls_asn1_get_int( p, end, iterations ) ) != 0 )
switches 0:5c4d7b2438d3 80 return( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT + ret );
switches 0:5c4d7b2438d3 81
switches 0:5c4d7b2438d3 82 if( *p != end )
switches 0:5c4d7b2438d3 83 return( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT +
switches 0:5c4d7b2438d3 84 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
switches 0:5c4d7b2438d3 85
switches 0:5c4d7b2438d3 86 return( 0 );
switches 0:5c4d7b2438d3 87 }
switches 0:5c4d7b2438d3 88
switches 0:5c4d7b2438d3 89 #define PKCS12_MAX_PWDLEN 128
switches 0:5c4d7b2438d3 90
switches 0:5c4d7b2438d3 91 static int pkcs12_pbe_derive_key_iv( mbedtls_asn1_buf *pbe_params, mbedtls_md_type_t md_type,
switches 0:5c4d7b2438d3 92 const unsigned char *pwd, size_t pwdlen,
switches 0:5c4d7b2438d3 93 unsigned char *key, size_t keylen,
switches 0:5c4d7b2438d3 94 unsigned char *iv, size_t ivlen )
switches 0:5c4d7b2438d3 95 {
switches 0:5c4d7b2438d3 96 int ret, iterations = 0;
switches 0:5c4d7b2438d3 97 mbedtls_asn1_buf salt;
switches 0:5c4d7b2438d3 98 size_t i;
switches 0:5c4d7b2438d3 99 unsigned char unipwd[PKCS12_MAX_PWDLEN * 2 + 2];
switches 0:5c4d7b2438d3 100
switches 0:5c4d7b2438d3 101 if( pwdlen > PKCS12_MAX_PWDLEN )
switches 0:5c4d7b2438d3 102 return( MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA );
switches 0:5c4d7b2438d3 103
switches 0:5c4d7b2438d3 104 memset( &salt, 0, sizeof(mbedtls_asn1_buf) );
switches 0:5c4d7b2438d3 105 memset( &unipwd, 0, sizeof(unipwd) );
switches 0:5c4d7b2438d3 106
switches 0:5c4d7b2438d3 107 if( ( ret = pkcs12_parse_pbe_params( pbe_params, &salt,
switches 0:5c4d7b2438d3 108 &iterations ) ) != 0 )
switches 0:5c4d7b2438d3 109 return( ret );
switches 0:5c4d7b2438d3 110
switches 0:5c4d7b2438d3 111 for( i = 0; i < pwdlen; i++ )
switches 0:5c4d7b2438d3 112 unipwd[i * 2 + 1] = pwd[i];
switches 0:5c4d7b2438d3 113
switches 0:5c4d7b2438d3 114 if( ( ret = mbedtls_pkcs12_derivation( key, keylen, unipwd, pwdlen * 2 + 2,
switches 0:5c4d7b2438d3 115 salt.p, salt.len, md_type,
switches 0:5c4d7b2438d3 116 MBEDTLS_PKCS12_DERIVE_KEY, iterations ) ) != 0 )
switches 0:5c4d7b2438d3 117 {
switches 0:5c4d7b2438d3 118 return( ret );
switches 0:5c4d7b2438d3 119 }
switches 0:5c4d7b2438d3 120
switches 0:5c4d7b2438d3 121 if( iv == NULL || ivlen == 0 )
switches 0:5c4d7b2438d3 122 return( 0 );
switches 0:5c4d7b2438d3 123
switches 0:5c4d7b2438d3 124 if( ( ret = mbedtls_pkcs12_derivation( iv, ivlen, unipwd, pwdlen * 2 + 2,
switches 0:5c4d7b2438d3 125 salt.p, salt.len, md_type,
switches 0:5c4d7b2438d3 126 MBEDTLS_PKCS12_DERIVE_IV, iterations ) ) != 0 )
switches 0:5c4d7b2438d3 127 {
switches 0:5c4d7b2438d3 128 return( ret );
switches 0:5c4d7b2438d3 129 }
switches 0:5c4d7b2438d3 130 return( 0 );
switches 0:5c4d7b2438d3 131 }
switches 0:5c4d7b2438d3 132
switches 0:5c4d7b2438d3 133 #undef PKCS12_MAX_PWDLEN
switches 0:5c4d7b2438d3 134
switches 0:5c4d7b2438d3 135 int mbedtls_pkcs12_pbe_sha1_rc4_128( mbedtls_asn1_buf *pbe_params, int mode,
switches 0:5c4d7b2438d3 136 const unsigned char *pwd, size_t pwdlen,
switches 0:5c4d7b2438d3 137 const unsigned char *data, size_t len,
switches 0:5c4d7b2438d3 138 unsigned char *output )
switches 0:5c4d7b2438d3 139 {
switches 0:5c4d7b2438d3 140 #if !defined(MBEDTLS_ARC4_C)
switches 0:5c4d7b2438d3 141 ((void) pbe_params);
switches 0:5c4d7b2438d3 142 ((void) mode);
switches 0:5c4d7b2438d3 143 ((void) pwd);
switches 0:5c4d7b2438d3 144 ((void) pwdlen);
switches 0:5c4d7b2438d3 145 ((void) data);
switches 0:5c4d7b2438d3 146 ((void) len);
switches 0:5c4d7b2438d3 147 ((void) output);
switches 0:5c4d7b2438d3 148 return( MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE );
switches 0:5c4d7b2438d3 149 #else
switches 0:5c4d7b2438d3 150 int ret;
switches 0:5c4d7b2438d3 151 unsigned char key[16];
switches 0:5c4d7b2438d3 152 mbedtls_arc4_context ctx;
switches 0:5c4d7b2438d3 153 ((void) mode);
switches 0:5c4d7b2438d3 154
switches 0:5c4d7b2438d3 155 mbedtls_arc4_init( &ctx );
switches 0:5c4d7b2438d3 156
switches 0:5c4d7b2438d3 157 if( ( ret = pkcs12_pbe_derive_key_iv( pbe_params, MBEDTLS_MD_SHA1,
switches 0:5c4d7b2438d3 158 pwd, pwdlen,
switches 0:5c4d7b2438d3 159 key, 16, NULL, 0 ) ) != 0 )
switches 0:5c4d7b2438d3 160 {
switches 0:5c4d7b2438d3 161 return( ret );
switches 0:5c4d7b2438d3 162 }
switches 0:5c4d7b2438d3 163
switches 0:5c4d7b2438d3 164 mbedtls_arc4_setup( &ctx, key, 16 );
switches 0:5c4d7b2438d3 165 if( ( ret = mbedtls_arc4_crypt( &ctx, len, data, output ) ) != 0 )
switches 0:5c4d7b2438d3 166 goto exit;
switches 0:5c4d7b2438d3 167
switches 0:5c4d7b2438d3 168 exit:
switches 0:5c4d7b2438d3 169 mbedtls_zeroize( key, sizeof( key ) );
switches 0:5c4d7b2438d3 170 mbedtls_arc4_free( &ctx );
switches 0:5c4d7b2438d3 171
switches 0:5c4d7b2438d3 172 return( ret );
switches 0:5c4d7b2438d3 173 #endif /* MBEDTLS_ARC4_C */
switches 0:5c4d7b2438d3 174 }
switches 0:5c4d7b2438d3 175
switches 0:5c4d7b2438d3 176 int mbedtls_pkcs12_pbe( mbedtls_asn1_buf *pbe_params, int mode,
switches 0:5c4d7b2438d3 177 mbedtls_cipher_type_t cipher_type, mbedtls_md_type_t md_type,
switches 0:5c4d7b2438d3 178 const unsigned char *pwd, size_t pwdlen,
switches 0:5c4d7b2438d3 179 const unsigned char *data, size_t len,
switches 0:5c4d7b2438d3 180 unsigned char *output )
switches 0:5c4d7b2438d3 181 {
switches 0:5c4d7b2438d3 182 int ret, keylen = 0;
switches 0:5c4d7b2438d3 183 unsigned char key[32];
switches 0:5c4d7b2438d3 184 unsigned char iv[16];
switches 0:5c4d7b2438d3 185 const mbedtls_cipher_info_t *cipher_info;
switches 0:5c4d7b2438d3 186 mbedtls_cipher_context_t cipher_ctx;
switches 0:5c4d7b2438d3 187 size_t olen = 0;
switches 0:5c4d7b2438d3 188
switches 0:5c4d7b2438d3 189 cipher_info = mbedtls_cipher_info_from_type( cipher_type );
switches 0:5c4d7b2438d3 190 if( cipher_info == NULL )
switches 0:5c4d7b2438d3 191 return( MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE );
switches 0:5c4d7b2438d3 192
switches 0:5c4d7b2438d3 193 keylen = cipher_info->key_bitlen / 8;
switches 0:5c4d7b2438d3 194
switches 0:5c4d7b2438d3 195 if( ( ret = pkcs12_pbe_derive_key_iv( pbe_params, md_type, pwd, pwdlen,
switches 0:5c4d7b2438d3 196 key, keylen,
switches 0:5c4d7b2438d3 197 iv, cipher_info->iv_size ) ) != 0 )
switches 0:5c4d7b2438d3 198 {
switches 0:5c4d7b2438d3 199 return( ret );
switches 0:5c4d7b2438d3 200 }
switches 0:5c4d7b2438d3 201
switches 0:5c4d7b2438d3 202 mbedtls_cipher_init( &cipher_ctx );
switches 0:5c4d7b2438d3 203
switches 0:5c4d7b2438d3 204 if( ( ret = mbedtls_cipher_setup( &cipher_ctx, cipher_info ) ) != 0 )
switches 0:5c4d7b2438d3 205 goto exit;
switches 0:5c4d7b2438d3 206
switches 0:5c4d7b2438d3 207 if( ( ret = mbedtls_cipher_setkey( &cipher_ctx, key, 8 * keylen, (mbedtls_operation_t) mode ) ) != 0 )
switches 0:5c4d7b2438d3 208 goto exit;
switches 0:5c4d7b2438d3 209
switches 0:5c4d7b2438d3 210 if( ( ret = mbedtls_cipher_set_iv( &cipher_ctx, iv, cipher_info->iv_size ) ) != 0 )
switches 0:5c4d7b2438d3 211 goto exit;
switches 0:5c4d7b2438d3 212
switches 0:5c4d7b2438d3 213 if( ( ret = mbedtls_cipher_reset( &cipher_ctx ) ) != 0 )
switches 0:5c4d7b2438d3 214 goto exit;
switches 0:5c4d7b2438d3 215
switches 0:5c4d7b2438d3 216 if( ( ret = mbedtls_cipher_update( &cipher_ctx, data, len,
switches 0:5c4d7b2438d3 217 output, &olen ) ) != 0 )
switches 0:5c4d7b2438d3 218 {
switches 0:5c4d7b2438d3 219 goto exit;
switches 0:5c4d7b2438d3 220 }
switches 0:5c4d7b2438d3 221
switches 0:5c4d7b2438d3 222 if( ( ret = mbedtls_cipher_finish( &cipher_ctx, output + olen, &olen ) ) != 0 )
switches 0:5c4d7b2438d3 223 ret = MBEDTLS_ERR_PKCS12_PASSWORD_MISMATCH;
switches 0:5c4d7b2438d3 224
switches 0:5c4d7b2438d3 225 exit:
switches 0:5c4d7b2438d3 226 mbedtls_zeroize( key, sizeof( key ) );
switches 0:5c4d7b2438d3 227 mbedtls_zeroize( iv, sizeof( iv ) );
switches 0:5c4d7b2438d3 228 mbedtls_cipher_free( &cipher_ctx );
switches 0:5c4d7b2438d3 229
switches 0:5c4d7b2438d3 230 return( ret );
switches 0:5c4d7b2438d3 231 }
switches 0:5c4d7b2438d3 232
switches 0:5c4d7b2438d3 233 static void pkcs12_fill_buffer( unsigned char *data, size_t data_len,
switches 0:5c4d7b2438d3 234 const unsigned char *filler, size_t fill_len )
switches 0:5c4d7b2438d3 235 {
switches 0:5c4d7b2438d3 236 unsigned char *p = data;
switches 0:5c4d7b2438d3 237 size_t use_len;
switches 0:5c4d7b2438d3 238
switches 0:5c4d7b2438d3 239 while( data_len > 0 )
switches 0:5c4d7b2438d3 240 {
switches 0:5c4d7b2438d3 241 use_len = ( data_len > fill_len ) ? fill_len : data_len;
switches 0:5c4d7b2438d3 242 memcpy( p, filler, use_len );
switches 0:5c4d7b2438d3 243 p += use_len;
switches 0:5c4d7b2438d3 244 data_len -= use_len;
switches 0:5c4d7b2438d3 245 }
switches 0:5c4d7b2438d3 246 }
switches 0:5c4d7b2438d3 247
switches 0:5c4d7b2438d3 248 int mbedtls_pkcs12_derivation( unsigned char *data, size_t datalen,
switches 0:5c4d7b2438d3 249 const unsigned char *pwd, size_t pwdlen,
switches 0:5c4d7b2438d3 250 const unsigned char *salt, size_t saltlen,
switches 0:5c4d7b2438d3 251 mbedtls_md_type_t md_type, int id, int iterations )
switches 0:5c4d7b2438d3 252 {
switches 0:5c4d7b2438d3 253 int ret;
switches 0:5c4d7b2438d3 254 unsigned int j;
switches 0:5c4d7b2438d3 255
switches 0:5c4d7b2438d3 256 unsigned char diversifier[128];
switches 0:5c4d7b2438d3 257 unsigned char salt_block[128], pwd_block[128], hash_block[128];
switches 0:5c4d7b2438d3 258 unsigned char hash_output[MBEDTLS_MD_MAX_SIZE];
switches 0:5c4d7b2438d3 259 unsigned char *p;
switches 0:5c4d7b2438d3 260 unsigned char c;
switches 0:5c4d7b2438d3 261
switches 0:5c4d7b2438d3 262 size_t hlen, use_len, v, i;
switches 0:5c4d7b2438d3 263
switches 0:5c4d7b2438d3 264 const mbedtls_md_info_t *md_info;
switches 0:5c4d7b2438d3 265 mbedtls_md_context_t md_ctx;
switches 0:5c4d7b2438d3 266
switches 0:5c4d7b2438d3 267 // This version only allows max of 64 bytes of password or salt
switches 0:5c4d7b2438d3 268 if( datalen > 128 || pwdlen > 64 || saltlen > 64 )
switches 0:5c4d7b2438d3 269 return( MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA );
switches 0:5c4d7b2438d3 270
switches 0:5c4d7b2438d3 271 md_info = mbedtls_md_info_from_type( md_type );
switches 0:5c4d7b2438d3 272 if( md_info == NULL )
switches 0:5c4d7b2438d3 273 return( MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE );
switches 0:5c4d7b2438d3 274
switches 0:5c4d7b2438d3 275 mbedtls_md_init( &md_ctx );
switches 0:5c4d7b2438d3 276
switches 0:5c4d7b2438d3 277 if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 0 ) ) != 0 )
switches 0:5c4d7b2438d3 278 return( ret );
switches 0:5c4d7b2438d3 279 hlen = mbedtls_md_get_size( md_info );
switches 0:5c4d7b2438d3 280
switches 0:5c4d7b2438d3 281 if( hlen <= 32 )
switches 0:5c4d7b2438d3 282 v = 64;
switches 0:5c4d7b2438d3 283 else
switches 0:5c4d7b2438d3 284 v = 128;
switches 0:5c4d7b2438d3 285
switches 0:5c4d7b2438d3 286 memset( diversifier, (unsigned char) id, v );
switches 0:5c4d7b2438d3 287
switches 0:5c4d7b2438d3 288 pkcs12_fill_buffer( salt_block, v, salt, saltlen );
switches 0:5c4d7b2438d3 289 pkcs12_fill_buffer( pwd_block, v, pwd, pwdlen );
switches 0:5c4d7b2438d3 290
switches 0:5c4d7b2438d3 291 p = data;
switches 0:5c4d7b2438d3 292 while( datalen > 0 )
switches 0:5c4d7b2438d3 293 {
switches 0:5c4d7b2438d3 294 // Calculate hash( diversifier || salt_block || pwd_block )
switches 0:5c4d7b2438d3 295 if( ( ret = mbedtls_md_starts( &md_ctx ) ) != 0 )
switches 0:5c4d7b2438d3 296 goto exit;
switches 0:5c4d7b2438d3 297
switches 0:5c4d7b2438d3 298 if( ( ret = mbedtls_md_update( &md_ctx, diversifier, v ) ) != 0 )
switches 0:5c4d7b2438d3 299 goto exit;
switches 0:5c4d7b2438d3 300
switches 0:5c4d7b2438d3 301 if( ( ret = mbedtls_md_update( &md_ctx, salt_block, v ) ) != 0 )
switches 0:5c4d7b2438d3 302 goto exit;
switches 0:5c4d7b2438d3 303
switches 0:5c4d7b2438d3 304 if( ( ret = mbedtls_md_update( &md_ctx, pwd_block, v ) ) != 0 )
switches 0:5c4d7b2438d3 305 goto exit;
switches 0:5c4d7b2438d3 306
switches 0:5c4d7b2438d3 307 if( ( ret = mbedtls_md_finish( &md_ctx, hash_output ) ) != 0 )
switches 0:5c4d7b2438d3 308 goto exit;
switches 0:5c4d7b2438d3 309
switches 0:5c4d7b2438d3 310 // Perform remaining ( iterations - 1 ) recursive hash calculations
switches 0:5c4d7b2438d3 311 for( i = 1; i < (size_t) iterations; i++ )
switches 0:5c4d7b2438d3 312 {
switches 0:5c4d7b2438d3 313 if( ( ret = mbedtls_md( md_info, hash_output, hlen, hash_output ) ) != 0 )
switches 0:5c4d7b2438d3 314 goto exit;
switches 0:5c4d7b2438d3 315 }
switches 0:5c4d7b2438d3 316
switches 0:5c4d7b2438d3 317 use_len = ( datalen > hlen ) ? hlen : datalen;
switches 0:5c4d7b2438d3 318 memcpy( p, hash_output, use_len );
switches 0:5c4d7b2438d3 319 datalen -= use_len;
switches 0:5c4d7b2438d3 320 p += use_len;
switches 0:5c4d7b2438d3 321
switches 0:5c4d7b2438d3 322 if( datalen == 0 )
switches 0:5c4d7b2438d3 323 break;
switches 0:5c4d7b2438d3 324
switches 0:5c4d7b2438d3 325 // Concatenating copies of hash_output into hash_block (B)
switches 0:5c4d7b2438d3 326 pkcs12_fill_buffer( hash_block, v, hash_output, hlen );
switches 0:5c4d7b2438d3 327
switches 0:5c4d7b2438d3 328 // B += 1
switches 0:5c4d7b2438d3 329 for( i = v; i > 0; i-- )
switches 0:5c4d7b2438d3 330 if( ++hash_block[i - 1] != 0 )
switches 0:5c4d7b2438d3 331 break;
switches 0:5c4d7b2438d3 332
switches 0:5c4d7b2438d3 333 // salt_block += B
switches 0:5c4d7b2438d3 334 c = 0;
switches 0:5c4d7b2438d3 335 for( i = v; i > 0; i-- )
switches 0:5c4d7b2438d3 336 {
switches 0:5c4d7b2438d3 337 j = salt_block[i - 1] + hash_block[i - 1] + c;
switches 0:5c4d7b2438d3 338 c = (unsigned char) (j >> 8);
switches 0:5c4d7b2438d3 339 salt_block[i - 1] = j & 0xFF;
switches 0:5c4d7b2438d3 340 }
switches 0:5c4d7b2438d3 341
switches 0:5c4d7b2438d3 342 // pwd_block += B
switches 0:5c4d7b2438d3 343 c = 0;
switches 0:5c4d7b2438d3 344 for( i = v; i > 0; i-- )
switches 0:5c4d7b2438d3 345 {
switches 0:5c4d7b2438d3 346 j = pwd_block[i - 1] + hash_block[i - 1] + c;
switches 0:5c4d7b2438d3 347 c = (unsigned char) (j >> 8);
switches 0:5c4d7b2438d3 348 pwd_block[i - 1] = j & 0xFF;
switches 0:5c4d7b2438d3 349 }
switches 0:5c4d7b2438d3 350 }
switches 0:5c4d7b2438d3 351
switches 0:5c4d7b2438d3 352 ret = 0;
switches 0:5c4d7b2438d3 353
switches 0:5c4d7b2438d3 354 exit:
switches 0:5c4d7b2438d3 355 mbedtls_zeroize( salt_block, sizeof( salt_block ) );
switches 0:5c4d7b2438d3 356 mbedtls_zeroize( pwd_block, sizeof( pwd_block ) );
switches 0:5c4d7b2438d3 357 mbedtls_zeroize( hash_block, sizeof( hash_block ) );
switches 0:5c4d7b2438d3 358 mbedtls_zeroize( hash_output, sizeof( hash_output ) );
switches 0:5c4d7b2438d3 359
switches 0:5c4d7b2438d3 360 mbedtls_md_free( &md_ctx );
switches 0:5c4d7b2438d3 361
switches 0:5c4d7b2438d3 362 return( ret );
switches 0:5c4d7b2438d3 363 }
switches 0:5c4d7b2438d3 364
switches 0:5c4d7b2438d3 365 #endif /* MBEDTLS_PKCS12_C */