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features/mbedtls/src/pkcs12.c@0:098463de4c5d, 2017-01-25 (annotated)

Committer:
group-onsemi
Date:
Wed Jan 25 20:34:15 2017 +0000
Revision:
0:098463de4c5d
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
group-onsemi 0:098463de4c5d 1 /*
group-onsemi 0:098463de4c5d 2 * PKCS#12 Personal Information Exchange Syntax
group-onsemi 0:098463de4c5d 3 *
group-onsemi 0:098463de4c5d 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
group-onsemi 0:098463de4c5d 5 * SPDX-License-Identifier: Apache-2.0
group-onsemi 0:098463de4c5d 6 *
group-onsemi 0:098463de4c5d 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
group-onsemi 0:098463de4c5d 8 * not use this file except in compliance with the License.
group-onsemi 0:098463de4c5d 9 * You may obtain a copy of the License at
group-onsemi 0:098463de4c5d 10 *
group-onsemi 0:098463de4c5d 11 * http://www.apache.org/licenses/LICENSE-2.0
group-onsemi 0:098463de4c5d 12 *
group-onsemi 0:098463de4c5d 13 * Unless required by applicable law or agreed to in writing, software
group-onsemi 0:098463de4c5d 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
group-onsemi 0:098463de4c5d 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
group-onsemi 0:098463de4c5d 16 * See the License for the specific language governing permissions and
group-onsemi 0:098463de4c5d 17 * limitations under the License.
group-onsemi 0:098463de4c5d 18 *
group-onsemi 0:098463de4c5d 19 * This file is part of mbed TLS (https://tls.mbed.org)
group-onsemi 0:098463de4c5d 20 */
group-onsemi 0:098463de4c5d 21 /*
group-onsemi 0:098463de4c5d 22 * The PKCS #12 Personal Information Exchange Syntax Standard v1.1
group-onsemi 0:098463de4c5d 23 *
group-onsemi 0:098463de4c5d 24 * http://www.rsa.com/rsalabs/pkcs/files/h11301-wp-pkcs-12v1-1-personal-information-exchange-syntax.pdf
group-onsemi 0:098463de4c5d 25 * ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-12/pkcs-12v1-1.asn
group-onsemi 0:098463de4c5d 26 */
group-onsemi 0:098463de4c5d 27
group-onsemi 0:098463de4c5d 28 #if !defined(MBEDTLS_CONFIG_FILE)
group-onsemi 0:098463de4c5d 29 #include "mbedtls/config.h"
group-onsemi 0:098463de4c5d 30 #else
group-onsemi 0:098463de4c5d 31 #include MBEDTLS_CONFIG_FILE
group-onsemi 0:098463de4c5d 32 #endif
group-onsemi 0:098463de4c5d 33
group-onsemi 0:098463de4c5d 34 #if defined(MBEDTLS_PKCS12_C)
group-onsemi 0:098463de4c5d 35
group-onsemi 0:098463de4c5d 36 #include "mbedtls/pkcs12.h"
group-onsemi 0:098463de4c5d 37 #include "mbedtls/asn1.h"
group-onsemi 0:098463de4c5d 38 #include "mbedtls/cipher.h"
group-onsemi 0:098463de4c5d 39
group-onsemi 0:098463de4c5d 40 #include <string.h>
group-onsemi 0:098463de4c5d 41
group-onsemi 0:098463de4c5d 42 #if defined(MBEDTLS_ARC4_C)
group-onsemi 0:098463de4c5d 43 #include "mbedtls/arc4.h"
group-onsemi 0:098463de4c5d 44 #endif
group-onsemi 0:098463de4c5d 45
group-onsemi 0:098463de4c5d 46 #if defined(MBEDTLS_DES_C)
group-onsemi 0:098463de4c5d 47 #include "mbedtls/des.h"
group-onsemi 0:098463de4c5d 48 #endif
group-onsemi 0:098463de4c5d 49
group-onsemi 0:098463de4c5d 50 /* Implementation that should never be optimized out by the compiler */
group-onsemi 0:098463de4c5d 51 static void mbedtls_zeroize( void *v, size_t n ) {
group-onsemi 0:098463de4c5d 52 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
group-onsemi 0:098463de4c5d 53 }
group-onsemi 0:098463de4c5d 54
group-onsemi 0:098463de4c5d 55 static int pkcs12_parse_pbe_params( mbedtls_asn1_buf *params,
group-onsemi 0:098463de4c5d 56 mbedtls_asn1_buf *salt, int *iterations )
group-onsemi 0:098463de4c5d 57 {
group-onsemi 0:098463de4c5d 58 int ret;
group-onsemi 0:098463de4c5d 59 unsigned char **p = &params->p;
group-onsemi 0:098463de4c5d 60 const unsigned char *end = params->p + params->len;
group-onsemi 0:098463de4c5d 61
group-onsemi 0:098463de4c5d 62 /*
group-onsemi 0:098463de4c5d 63 * pkcs-12PbeParams ::= SEQUENCE {
group-onsemi 0:098463de4c5d 64 * salt OCTET STRING,
group-onsemi 0:098463de4c5d 65 * iterations INTEGER
group-onsemi 0:098463de4c5d 66 * }
group-onsemi 0:098463de4c5d 67 *
group-onsemi 0:098463de4c5d 68 */
group-onsemi 0:098463de4c5d 69 if( params->tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) )
group-onsemi 0:098463de4c5d 70 return( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT +
group-onsemi 0:098463de4c5d 71 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
group-onsemi 0:098463de4c5d 72
group-onsemi 0:098463de4c5d 73 if( ( ret = mbedtls_asn1_get_tag( p, end, &salt->len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
group-onsemi 0:098463de4c5d 74 return( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT + ret );
group-onsemi 0:098463de4c5d 75
group-onsemi 0:098463de4c5d 76 salt->p = *p;
group-onsemi 0:098463de4c5d 77 *p += salt->len;
group-onsemi 0:098463de4c5d 78
group-onsemi 0:098463de4c5d 79 if( ( ret = mbedtls_asn1_get_int( p, end, iterations ) ) != 0 )
group-onsemi 0:098463de4c5d 80 return( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT + ret );
group-onsemi 0:098463de4c5d 81
group-onsemi 0:098463de4c5d 82 if( *p != end )
group-onsemi 0:098463de4c5d 83 return( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT +
group-onsemi 0:098463de4c5d 84 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
group-onsemi 0:098463de4c5d 85
group-onsemi 0:098463de4c5d 86 return( 0 );
group-onsemi 0:098463de4c5d 87 }
group-onsemi 0:098463de4c5d 88
group-onsemi 0:098463de4c5d 89 #define PKCS12_MAX_PWDLEN 128
group-onsemi 0:098463de4c5d 90
group-onsemi 0:098463de4c5d 91 static int pkcs12_pbe_derive_key_iv( mbedtls_asn1_buf *pbe_params, mbedtls_md_type_t md_type,
group-onsemi 0:098463de4c5d 92 const unsigned char *pwd, size_t pwdlen,
group-onsemi 0:098463de4c5d 93 unsigned char *key, size_t keylen,
group-onsemi 0:098463de4c5d 94 unsigned char *iv, size_t ivlen )
group-onsemi 0:098463de4c5d 95 {
group-onsemi 0:098463de4c5d 96 int ret, iterations = 0;
group-onsemi 0:098463de4c5d 97 mbedtls_asn1_buf salt;
group-onsemi 0:098463de4c5d 98 size_t i;
group-onsemi 0:098463de4c5d 99 unsigned char unipwd[PKCS12_MAX_PWDLEN * 2 + 2];
group-onsemi 0:098463de4c5d 100
group-onsemi 0:098463de4c5d 101 if( pwdlen > PKCS12_MAX_PWDLEN )
group-onsemi 0:098463de4c5d 102 return( MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 103
group-onsemi 0:098463de4c5d 104 memset( &salt, 0, sizeof(mbedtls_asn1_buf) );
group-onsemi 0:098463de4c5d 105 memset( &unipwd, 0, sizeof(unipwd) );
group-onsemi 0:098463de4c5d 106
group-onsemi 0:098463de4c5d 107 if( ( ret = pkcs12_parse_pbe_params( pbe_params, &salt,
group-onsemi 0:098463de4c5d 108 &iterations ) ) != 0 )
group-onsemi 0:098463de4c5d 109 return( ret );
group-onsemi 0:098463de4c5d 110
group-onsemi 0:098463de4c5d 111 for( i = 0; i < pwdlen; i++ )
group-onsemi 0:098463de4c5d 112 unipwd[i * 2 + 1] = pwd[i];
group-onsemi 0:098463de4c5d 113
group-onsemi 0:098463de4c5d 114 if( ( ret = mbedtls_pkcs12_derivation( key, keylen, unipwd, pwdlen * 2 + 2,
group-onsemi 0:098463de4c5d 115 salt.p, salt.len, md_type,
group-onsemi 0:098463de4c5d 116 MBEDTLS_PKCS12_DERIVE_KEY, iterations ) ) != 0 )
group-onsemi 0:098463de4c5d 117 {
group-onsemi 0:098463de4c5d 118 return( ret );
group-onsemi 0:098463de4c5d 119 }
group-onsemi 0:098463de4c5d 120
group-onsemi 0:098463de4c5d 121 if( iv == NULL || ivlen == 0 )
group-onsemi 0:098463de4c5d 122 return( 0 );
group-onsemi 0:098463de4c5d 123
group-onsemi 0:098463de4c5d 124 if( ( ret = mbedtls_pkcs12_derivation( iv, ivlen, unipwd, pwdlen * 2 + 2,
group-onsemi 0:098463de4c5d 125 salt.p, salt.len, md_type,
group-onsemi 0:098463de4c5d 126 MBEDTLS_PKCS12_DERIVE_IV, iterations ) ) != 0 )
group-onsemi 0:098463de4c5d 127 {
group-onsemi 0:098463de4c5d 128 return( ret );
group-onsemi 0:098463de4c5d 129 }
group-onsemi 0:098463de4c5d 130 return( 0 );
group-onsemi 0:098463de4c5d 131 }
group-onsemi 0:098463de4c5d 132
group-onsemi 0:098463de4c5d 133 #undef PKCS12_MAX_PWDLEN
group-onsemi 0:098463de4c5d 134
group-onsemi 0:098463de4c5d 135 int mbedtls_pkcs12_pbe_sha1_rc4_128( mbedtls_asn1_buf *pbe_params, int mode,
group-onsemi 0:098463de4c5d 136 const unsigned char *pwd, size_t pwdlen,
group-onsemi 0:098463de4c5d 137 const unsigned char *data, size_t len,
group-onsemi 0:098463de4c5d 138 unsigned char *output )
group-onsemi 0:098463de4c5d 139 {
group-onsemi 0:098463de4c5d 140 #if !defined(MBEDTLS_ARC4_C)
group-onsemi 0:098463de4c5d 141 ((void) pbe_params);
group-onsemi 0:098463de4c5d 142 ((void) mode);
group-onsemi 0:098463de4c5d 143 ((void) pwd);
group-onsemi 0:098463de4c5d 144 ((void) pwdlen);
group-onsemi 0:098463de4c5d 145 ((void) data);
group-onsemi 0:098463de4c5d 146 ((void) len);
group-onsemi 0:098463de4c5d 147 ((void) output);
group-onsemi 0:098463de4c5d 148 return( MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE );
group-onsemi 0:098463de4c5d 149 #else
group-onsemi 0:098463de4c5d 150 int ret;
group-onsemi 0:098463de4c5d 151 unsigned char key[16];
group-onsemi 0:098463de4c5d 152 mbedtls_arc4_context ctx;
group-onsemi 0:098463de4c5d 153 ((void) mode);
group-onsemi 0:098463de4c5d 154
group-onsemi 0:098463de4c5d 155 mbedtls_arc4_init( &ctx );
group-onsemi 0:098463de4c5d 156
group-onsemi 0:098463de4c5d 157 if( ( ret = pkcs12_pbe_derive_key_iv( pbe_params, MBEDTLS_MD_SHA1,
group-onsemi 0:098463de4c5d 158 pwd, pwdlen,
group-onsemi 0:098463de4c5d 159 key, 16, NULL, 0 ) ) != 0 )
group-onsemi 0:098463de4c5d 160 {
group-onsemi 0:098463de4c5d 161 return( ret );
group-onsemi 0:098463de4c5d 162 }
group-onsemi 0:098463de4c5d 163
group-onsemi 0:098463de4c5d 164 mbedtls_arc4_setup( &ctx, key, 16 );
group-onsemi 0:098463de4c5d 165 if( ( ret = mbedtls_arc4_crypt( &ctx, len, data, output ) ) != 0 )
group-onsemi 0:098463de4c5d 166 goto exit;
group-onsemi 0:098463de4c5d 167
group-onsemi 0:098463de4c5d 168 exit:
group-onsemi 0:098463de4c5d 169 mbedtls_zeroize( key, sizeof( key ) );
group-onsemi 0:098463de4c5d 170 mbedtls_arc4_free( &ctx );
group-onsemi 0:098463de4c5d 171
group-onsemi 0:098463de4c5d 172 return( ret );
group-onsemi 0:098463de4c5d 173 #endif /* MBEDTLS_ARC4_C */
group-onsemi 0:098463de4c5d 174 }
group-onsemi 0:098463de4c5d 175
group-onsemi 0:098463de4c5d 176 int mbedtls_pkcs12_pbe( mbedtls_asn1_buf *pbe_params, int mode,
group-onsemi 0:098463de4c5d 177 mbedtls_cipher_type_t cipher_type, mbedtls_md_type_t md_type,
group-onsemi 0:098463de4c5d 178 const unsigned char *pwd, size_t pwdlen,
group-onsemi 0:098463de4c5d 179 const unsigned char *data, size_t len,
group-onsemi 0:098463de4c5d 180 unsigned char *output )
group-onsemi 0:098463de4c5d 181 {
group-onsemi 0:098463de4c5d 182 int ret, keylen = 0;
group-onsemi 0:098463de4c5d 183 unsigned char key[32];
group-onsemi 0:098463de4c5d 184 unsigned char iv[16];
group-onsemi 0:098463de4c5d 185 const mbedtls_cipher_info_t *cipher_info;
group-onsemi 0:098463de4c5d 186 mbedtls_cipher_context_t cipher_ctx;
group-onsemi 0:098463de4c5d 187 size_t olen = 0;
group-onsemi 0:098463de4c5d 188
group-onsemi 0:098463de4c5d 189 cipher_info = mbedtls_cipher_info_from_type( cipher_type );
group-onsemi 0:098463de4c5d 190 if( cipher_info == NULL )
group-onsemi 0:098463de4c5d 191 return( MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE );
group-onsemi 0:098463de4c5d 192
group-onsemi 0:098463de4c5d 193 keylen = cipher_info->key_bitlen / 8;
group-onsemi 0:098463de4c5d 194
group-onsemi 0:098463de4c5d 195 if( ( ret = pkcs12_pbe_derive_key_iv( pbe_params, md_type, pwd, pwdlen,
group-onsemi 0:098463de4c5d 196 key, keylen,
group-onsemi 0:098463de4c5d 197 iv, cipher_info->iv_size ) ) != 0 )
group-onsemi 0:098463de4c5d 198 {
group-onsemi 0:098463de4c5d 199 return( ret );
group-onsemi 0:098463de4c5d 200 }
group-onsemi 0:098463de4c5d 201
group-onsemi 0:098463de4c5d 202 mbedtls_cipher_init( &cipher_ctx );
group-onsemi 0:098463de4c5d 203
group-onsemi 0:098463de4c5d 204 if( ( ret = mbedtls_cipher_setup( &cipher_ctx, cipher_info ) ) != 0 )
group-onsemi 0:098463de4c5d 205 goto exit;
group-onsemi 0:098463de4c5d 206
group-onsemi 0:098463de4c5d 207 if( ( ret = mbedtls_cipher_setkey( &cipher_ctx, key, 8 * keylen, (mbedtls_operation_t) mode ) ) != 0 )
group-onsemi 0:098463de4c5d 208 goto exit;
group-onsemi 0:098463de4c5d 209
group-onsemi 0:098463de4c5d 210 if( ( ret = mbedtls_cipher_set_iv( &cipher_ctx, iv, cipher_info->iv_size ) ) != 0 )
group-onsemi 0:098463de4c5d 211 goto exit;
group-onsemi 0:098463de4c5d 212
group-onsemi 0:098463de4c5d 213 if( ( ret = mbedtls_cipher_reset( &cipher_ctx ) ) != 0 )
group-onsemi 0:098463de4c5d 214 goto exit;
group-onsemi 0:098463de4c5d 215
group-onsemi 0:098463de4c5d 216 if( ( ret = mbedtls_cipher_update( &cipher_ctx, data, len,
group-onsemi 0:098463de4c5d 217 output, &olen ) ) != 0 )
group-onsemi 0:098463de4c5d 218 {
group-onsemi 0:098463de4c5d 219 goto exit;
group-onsemi 0:098463de4c5d 220 }
group-onsemi 0:098463de4c5d 221
group-onsemi 0:098463de4c5d 222 if( ( ret = mbedtls_cipher_finish( &cipher_ctx, output + olen, &olen ) ) != 0 )
group-onsemi 0:098463de4c5d 223 ret = MBEDTLS_ERR_PKCS12_PASSWORD_MISMATCH;
group-onsemi 0:098463de4c5d 224
group-onsemi 0:098463de4c5d 225 exit:
group-onsemi 0:098463de4c5d 226 mbedtls_zeroize( key, sizeof( key ) );
group-onsemi 0:098463de4c5d 227 mbedtls_zeroize( iv, sizeof( iv ) );
group-onsemi 0:098463de4c5d 228 mbedtls_cipher_free( &cipher_ctx );
group-onsemi 0:098463de4c5d 229
group-onsemi 0:098463de4c5d 230 return( ret );
group-onsemi 0:098463de4c5d 231 }
group-onsemi 0:098463de4c5d 232
group-onsemi 0:098463de4c5d 233 static void pkcs12_fill_buffer( unsigned char *data, size_t data_len,
group-onsemi 0:098463de4c5d 234 const unsigned char *filler, size_t fill_len )
group-onsemi 0:098463de4c5d 235 {
group-onsemi 0:098463de4c5d 236 unsigned char *p = data;
group-onsemi 0:098463de4c5d 237 size_t use_len;
group-onsemi 0:098463de4c5d 238
group-onsemi 0:098463de4c5d 239 while( data_len > 0 )
group-onsemi 0:098463de4c5d 240 {
group-onsemi 0:098463de4c5d 241 use_len = ( data_len > fill_len ) ? fill_len : data_len;
group-onsemi 0:098463de4c5d 242 memcpy( p, filler, use_len );
group-onsemi 0:098463de4c5d 243 p += use_len;
group-onsemi 0:098463de4c5d 244 data_len -= use_len;
group-onsemi 0:098463de4c5d 245 }
group-onsemi 0:098463de4c5d 246 }
group-onsemi 0:098463de4c5d 247
group-onsemi 0:098463de4c5d 248 int mbedtls_pkcs12_derivation( unsigned char *data, size_t datalen,
group-onsemi 0:098463de4c5d 249 const unsigned char *pwd, size_t pwdlen,
group-onsemi 0:098463de4c5d 250 const unsigned char *salt, size_t saltlen,
group-onsemi 0:098463de4c5d 251 mbedtls_md_type_t md_type, int id, int iterations )
group-onsemi 0:098463de4c5d 252 {
group-onsemi 0:098463de4c5d 253 int ret;
group-onsemi 0:098463de4c5d 254 unsigned int j;
group-onsemi 0:098463de4c5d 255
group-onsemi 0:098463de4c5d 256 unsigned char diversifier[128];
group-onsemi 0:098463de4c5d 257 unsigned char salt_block[128], pwd_block[128], hash_block[128];
group-onsemi 0:098463de4c5d 258 unsigned char hash_output[MBEDTLS_MD_MAX_SIZE];
group-onsemi 0:098463de4c5d 259 unsigned char *p;
group-onsemi 0:098463de4c5d 260 unsigned char c;
group-onsemi 0:098463de4c5d 261
group-onsemi 0:098463de4c5d 262 size_t hlen, use_len, v, i;
group-onsemi 0:098463de4c5d 263
group-onsemi 0:098463de4c5d 264 const mbedtls_md_info_t *md_info;
group-onsemi 0:098463de4c5d 265 mbedtls_md_context_t md_ctx;
group-onsemi 0:098463de4c5d 266
group-onsemi 0:098463de4c5d 267 // This version only allows max of 64 bytes of password or salt
group-onsemi 0:098463de4c5d 268 if( datalen > 128 || pwdlen > 64 || saltlen > 64 )
group-onsemi 0:098463de4c5d 269 return( MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 270
group-onsemi 0:098463de4c5d 271 md_info = mbedtls_md_info_from_type( md_type );
group-onsemi 0:098463de4c5d 272 if( md_info == NULL )
group-onsemi 0:098463de4c5d 273 return( MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE );
group-onsemi 0:098463de4c5d 274
group-onsemi 0:098463de4c5d 275 mbedtls_md_init( &md_ctx );
group-onsemi 0:098463de4c5d 276
group-onsemi 0:098463de4c5d 277 if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 0 ) ) != 0 )
group-onsemi 0:098463de4c5d 278 return( ret );
group-onsemi 0:098463de4c5d 279 hlen = mbedtls_md_get_size( md_info );
group-onsemi 0:098463de4c5d 280
group-onsemi 0:098463de4c5d 281 if( hlen <= 32 )
group-onsemi 0:098463de4c5d 282 v = 64;
group-onsemi 0:098463de4c5d 283 else
group-onsemi 0:098463de4c5d 284 v = 128;
group-onsemi 0:098463de4c5d 285
group-onsemi 0:098463de4c5d 286 memset( diversifier, (unsigned char) id, v );
group-onsemi 0:098463de4c5d 287
group-onsemi 0:098463de4c5d 288 pkcs12_fill_buffer( salt_block, v, salt, saltlen );
group-onsemi 0:098463de4c5d 289 pkcs12_fill_buffer( pwd_block, v, pwd, pwdlen );
group-onsemi 0:098463de4c5d 290
group-onsemi 0:098463de4c5d 291 p = data;
group-onsemi 0:098463de4c5d 292 while( datalen > 0 )
group-onsemi 0:098463de4c5d 293 {
group-onsemi 0:098463de4c5d 294 // Calculate hash( diversifier || salt_block || pwd_block )
group-onsemi 0:098463de4c5d 295 if( ( ret = mbedtls_md_starts( &md_ctx ) ) != 0 )
group-onsemi 0:098463de4c5d 296 goto exit;
group-onsemi 0:098463de4c5d 297
group-onsemi 0:098463de4c5d 298 if( ( ret = mbedtls_md_update( &md_ctx, diversifier, v ) ) != 0 )
group-onsemi 0:098463de4c5d 299 goto exit;
group-onsemi 0:098463de4c5d 300
group-onsemi 0:098463de4c5d 301 if( ( ret = mbedtls_md_update( &md_ctx, salt_block, v ) ) != 0 )
group-onsemi 0:098463de4c5d 302 goto exit;
group-onsemi 0:098463de4c5d 303
group-onsemi 0:098463de4c5d 304 if( ( ret = mbedtls_md_update( &md_ctx, pwd_block, v ) ) != 0 )
group-onsemi 0:098463de4c5d 305 goto exit;
group-onsemi 0:098463de4c5d 306
group-onsemi 0:098463de4c5d 307 if( ( ret = mbedtls_md_finish( &md_ctx, hash_output ) ) != 0 )
group-onsemi 0:098463de4c5d 308 goto exit;
group-onsemi 0:098463de4c5d 309
group-onsemi 0:098463de4c5d 310 // Perform remaining ( iterations - 1 ) recursive hash calculations
group-onsemi 0:098463de4c5d 311 for( i = 1; i < (size_t) iterations; i++ )
group-onsemi 0:098463de4c5d 312 {
group-onsemi 0:098463de4c5d 313 if( ( ret = mbedtls_md( md_info, hash_output, hlen, hash_output ) ) != 0 )
group-onsemi 0:098463de4c5d 314 goto exit;
group-onsemi 0:098463de4c5d 315 }
group-onsemi 0:098463de4c5d 316
group-onsemi 0:098463de4c5d 317 use_len = ( datalen > hlen ) ? hlen : datalen;
group-onsemi 0:098463de4c5d 318 memcpy( p, hash_output, use_len );
group-onsemi 0:098463de4c5d 319 datalen -= use_len;
group-onsemi 0:098463de4c5d 320 p += use_len;
group-onsemi 0:098463de4c5d 321
group-onsemi 0:098463de4c5d 322 if( datalen == 0 )
group-onsemi 0:098463de4c5d 323 break;
group-onsemi 0:098463de4c5d 324
group-onsemi 0:098463de4c5d 325 // Concatenating copies of hash_output into hash_block (B)
group-onsemi 0:098463de4c5d 326 pkcs12_fill_buffer( hash_block, v, hash_output, hlen );
group-onsemi 0:098463de4c5d 327
group-onsemi 0:098463de4c5d 328 // B += 1
group-onsemi 0:098463de4c5d 329 for( i = v; i > 0; i-- )
group-onsemi 0:098463de4c5d 330 if( ++hash_block[i - 1] != 0 )
group-onsemi 0:098463de4c5d 331 break;
group-onsemi 0:098463de4c5d 332
group-onsemi 0:098463de4c5d 333 // salt_block += B
group-onsemi 0:098463de4c5d 334 c = 0;
group-onsemi 0:098463de4c5d 335 for( i = v; i > 0; i-- )
group-onsemi 0:098463de4c5d 336 {
group-onsemi 0:098463de4c5d 337 j = salt_block[i - 1] + hash_block[i - 1] + c;
group-onsemi 0:098463de4c5d 338 c = (unsigned char) (j >> 8);
group-onsemi 0:098463de4c5d 339 salt_block[i - 1] = j & 0xFF;
group-onsemi 0:098463de4c5d 340 }
group-onsemi 0:098463de4c5d 341
group-onsemi 0:098463de4c5d 342 // pwd_block += B
group-onsemi 0:098463de4c5d 343 c = 0;
group-onsemi 0:098463de4c5d 344 for( i = v; i > 0; i-- )
group-onsemi 0:098463de4c5d 345 {
group-onsemi 0:098463de4c5d 346 j = pwd_block[i - 1] + hash_block[i - 1] + c;
group-onsemi 0:098463de4c5d 347 c = (unsigned char) (j >> 8);
group-onsemi 0:098463de4c5d 348 pwd_block[i - 1] = j & 0xFF;
group-onsemi 0:098463de4c5d 349 }
group-onsemi 0:098463de4c5d 350 }
group-onsemi 0:098463de4c5d 351
group-onsemi 0:098463de4c5d 352 ret = 0;
group-onsemi 0:098463de4c5d 353
group-onsemi 0:098463de4c5d 354 exit:
group-onsemi 0:098463de4c5d 355 mbedtls_zeroize( salt_block, sizeof( salt_block ) );
group-onsemi 0:098463de4c5d 356 mbedtls_zeroize( pwd_block, sizeof( pwd_block ) );
group-onsemi 0:098463de4c5d 357 mbedtls_zeroize( hash_block, sizeof( hash_block ) );
group-onsemi 0:098463de4c5d 358 mbedtls_zeroize( hash_output, sizeof( hash_output ) );
group-onsemi 0:098463de4c5d 359
group-onsemi 0:098463de4c5d 360 mbedtls_md_free( &md_ctx );
group-onsemi 0:098463de4c5d 361
group-onsemi 0:098463de4c5d 362 return( ret );
group-onsemi 0:098463de4c5d 363 }
group-onsemi 0:098463de4c5d 364
group-onsemi 0:098463de4c5d 365 #endif /* MBEDTLS_PKCS12_C */