441 lines
13 KiB
C
441 lines
13 KiB
C
/**
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* \file pkcs5.c
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*
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* \brief PKCS#5 functions
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*
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* \author Mathias Olsson <mathias@kompetensum.com>
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*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
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*
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* This file is provided under the Apache License 2.0, or the
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* GNU General Public License v2.0 or later.
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*
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* **********
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* Apache License 2.0:
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* **********
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*
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* **********
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* GNU General Public License v2.0 or later:
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* **********
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*/
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/*
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* PKCS#5 includes PBKDF2 and more
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*
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* http://tools.ietf.org/html/rfc2898 (Specification)
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* http://tools.ietf.org/html/rfc6070 (Test vectors)
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*/
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#if defined(MBEDTLS_PKCS5_C)
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#include "mbedtls/pkcs5.h"
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#if defined(MBEDTLS_ASN1_PARSE_C)
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#include "mbedtls/asn1.h"
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#include "mbedtls/cipher.h"
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#include "mbedtls/oid.h"
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#endif /* MBEDTLS_ASN1_PARSE_C */
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#include <string.h>
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#if defined(MBEDTLS_PLATFORM_C)
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#include "mbedtls/platform.h"
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#else
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#include <stdio.h>
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#define mbedtls_printf printf
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#endif
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#if defined(MBEDTLS_ASN1_PARSE_C)
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static int pkcs5_parse_pbkdf2_params( const mbedtls_asn1_buf *params,
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mbedtls_asn1_buf *salt, int *iterations,
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int *keylen, mbedtls_md_type_t *md_type )
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{
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int ret;
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mbedtls_asn1_buf prf_alg_oid;
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unsigned char *p = params->p;
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const unsigned char *end = params->p + params->len;
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if( params->tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) )
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return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT +
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MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
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/*
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* PBKDF2-params ::= SEQUENCE {
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* salt OCTET STRING,
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* iterationCount INTEGER,
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* keyLength INTEGER OPTIONAL
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* prf AlgorithmIdentifier DEFAULT algid-hmacWithSHA1
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* }
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*
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*/
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if( ( ret = mbedtls_asn1_get_tag( &p, end, &salt->len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
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return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT + ret );
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salt->p = p;
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p += salt->len;
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if( ( ret = mbedtls_asn1_get_int( &p, end, iterations ) ) != 0 )
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return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT + ret );
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if( p == end )
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return( 0 );
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if( ( ret = mbedtls_asn1_get_int( &p, end, keylen ) ) != 0 )
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{
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if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
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return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT + ret );
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}
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if( p == end )
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return( 0 );
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if( ( ret = mbedtls_asn1_get_alg_null( &p, end, &prf_alg_oid ) ) != 0 )
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return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT + ret );
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if( mbedtls_oid_get_md_hmac( &prf_alg_oid, md_type ) != 0 )
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return( MBEDTLS_ERR_PKCS5_FEATURE_UNAVAILABLE );
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if( p != end )
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return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT +
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MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
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return( 0 );
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}
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int mbedtls_pkcs5_pbes2( const mbedtls_asn1_buf *pbe_params, int mode,
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const unsigned char *pwd, size_t pwdlen,
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const unsigned char *data, size_t datalen,
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unsigned char *output )
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{
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int ret, iterations = 0, keylen = 0;
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unsigned char *p, *end;
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mbedtls_asn1_buf kdf_alg_oid, enc_scheme_oid, kdf_alg_params, enc_scheme_params;
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mbedtls_asn1_buf salt;
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mbedtls_md_type_t md_type = MBEDTLS_MD_SHA1;
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unsigned char key[32], iv[32];
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size_t olen = 0;
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const mbedtls_md_info_t *md_info;
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const mbedtls_cipher_info_t *cipher_info;
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mbedtls_md_context_t md_ctx;
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mbedtls_cipher_type_t cipher_alg;
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mbedtls_cipher_context_t cipher_ctx;
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p = pbe_params->p;
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end = p + pbe_params->len;
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/*
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* PBES2-params ::= SEQUENCE {
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* keyDerivationFunc AlgorithmIdentifier {{PBES2-KDFs}},
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* encryptionScheme AlgorithmIdentifier {{PBES2-Encs}}
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* }
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*/
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if( pbe_params->tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) )
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return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT +
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MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
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if( ( ret = mbedtls_asn1_get_alg( &p, end, &kdf_alg_oid, &kdf_alg_params ) ) != 0 )
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return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT + ret );
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// Only PBKDF2 supported at the moment
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//
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if( MBEDTLS_OID_CMP( MBEDTLS_OID_PKCS5_PBKDF2, &kdf_alg_oid ) != 0 )
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return( MBEDTLS_ERR_PKCS5_FEATURE_UNAVAILABLE );
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if( ( ret = pkcs5_parse_pbkdf2_params( &kdf_alg_params,
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&salt, &iterations, &keylen,
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&md_type ) ) != 0 )
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{
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return( ret );
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}
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md_info = mbedtls_md_info_from_type( md_type );
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if( md_info == NULL )
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return( MBEDTLS_ERR_PKCS5_FEATURE_UNAVAILABLE );
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if( ( ret = mbedtls_asn1_get_alg( &p, end, &enc_scheme_oid,
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&enc_scheme_params ) ) != 0 )
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{
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return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT + ret );
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}
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if( mbedtls_oid_get_cipher_alg( &enc_scheme_oid, &cipher_alg ) != 0 )
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return( MBEDTLS_ERR_PKCS5_FEATURE_UNAVAILABLE );
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cipher_info = mbedtls_cipher_info_from_type( cipher_alg );
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if( cipher_info == NULL )
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return( MBEDTLS_ERR_PKCS5_FEATURE_UNAVAILABLE );
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/*
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* The value of keylen from pkcs5_parse_pbkdf2_params() is ignored
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* since it is optional and we don't know if it was set or not
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*/
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keylen = cipher_info->key_bitlen / 8;
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if( enc_scheme_params.tag != MBEDTLS_ASN1_OCTET_STRING ||
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enc_scheme_params.len != cipher_info->iv_size )
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{
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return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT );
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}
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mbedtls_md_init( &md_ctx );
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mbedtls_cipher_init( &cipher_ctx );
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memcpy( iv, enc_scheme_params.p, enc_scheme_params.len );
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if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 )
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goto exit;
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if( ( ret = mbedtls_pkcs5_pbkdf2_hmac( &md_ctx, pwd, pwdlen, salt.p, salt.len,
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iterations, keylen, key ) ) != 0 )
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{
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goto exit;
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}
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if( ( ret = mbedtls_cipher_setup( &cipher_ctx, cipher_info ) ) != 0 )
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goto exit;
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if( ( ret = mbedtls_cipher_setkey( &cipher_ctx, key, 8 * keylen, (mbedtls_operation_t) mode ) ) != 0 )
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goto exit;
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if( ( ret = mbedtls_cipher_crypt( &cipher_ctx, iv, enc_scheme_params.len,
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data, datalen, output, &olen ) ) != 0 )
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ret = MBEDTLS_ERR_PKCS5_PASSWORD_MISMATCH;
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exit:
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mbedtls_md_free( &md_ctx );
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mbedtls_cipher_free( &cipher_ctx );
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return( ret );
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}
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#endif /* MBEDTLS_ASN1_PARSE_C */
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int mbedtls_pkcs5_pbkdf2_hmac( mbedtls_md_context_t *ctx, const unsigned char *password,
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size_t plen, const unsigned char *salt, size_t slen,
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unsigned int iteration_count,
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uint32_t key_length, unsigned char *output )
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{
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int ret = 0, j;
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unsigned int i;
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unsigned char md1[MBEDTLS_MD_MAX_SIZE];
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unsigned char work[MBEDTLS_MD_MAX_SIZE];
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unsigned char md_size = mbedtls_md_get_size( ctx->md_info );
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size_t use_len;
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unsigned char *out_p = output;
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unsigned char counter[4];
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memset( counter, 0, 4 );
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counter[3] = 1;
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#if UINT_MAX > 0xFFFFFFFF
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if( iteration_count > 0xFFFFFFFF )
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return( MBEDTLS_ERR_PKCS5_BAD_INPUT_DATA );
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#endif
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while( key_length )
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{
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// U1 ends up in work
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//
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if( ( ret = mbedtls_md_hmac_starts( ctx, password, plen ) ) != 0 )
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goto cleanup;
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if( ( ret = mbedtls_md_hmac_update( ctx, salt, slen ) ) != 0 )
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goto cleanup;
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if( ( ret = mbedtls_md_hmac_update( ctx, counter, 4 ) ) != 0 )
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goto cleanup;
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if( ( ret = mbedtls_md_hmac_finish( ctx, work ) ) != 0 )
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goto cleanup;
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memcpy( md1, work, md_size );
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for( i = 1; i < iteration_count; i++ )
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{
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// U2 ends up in md1
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//
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if( ( ret = mbedtls_md_hmac_starts( ctx, password, plen ) ) != 0 )
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goto cleanup;
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if( ( ret = mbedtls_md_hmac_update( ctx, md1, md_size ) ) != 0 )
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goto cleanup;
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if( ( ret = mbedtls_md_hmac_finish( ctx, md1 ) ) != 0 )
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goto cleanup;
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// U1 xor U2
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//
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for( j = 0; j < md_size; j++ )
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work[j] ^= md1[j];
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}
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use_len = ( key_length < md_size ) ? key_length : md_size;
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memcpy( out_p, work, use_len );
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key_length -= (uint32_t) use_len;
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out_p += use_len;
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for( i = 4; i > 0; i-- )
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if( ++counter[i - 1] != 0 )
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break;
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}
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cleanup:
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/* Zeroise buffers to clear sensitive data from memory. */
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mbedtls_platform_zeroize( work, MBEDTLS_MD_MAX_SIZE );
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mbedtls_platform_zeroize( md1, MBEDTLS_MD_MAX_SIZE );
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return( ret );
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}
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#if defined(MBEDTLS_SELF_TEST)
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#if !defined(MBEDTLS_SHA1_C)
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int mbedtls_pkcs5_self_test( int verbose )
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{
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if( verbose != 0 )
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mbedtls_printf( " PBKDF2 (SHA1): skipped\n\n" );
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return( 0 );
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}
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#else
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#define MAX_TESTS 6
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static const size_t plen[MAX_TESTS] =
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{ 8, 8, 8, 24, 9 };
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static const unsigned char password[MAX_TESTS][32] =
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{
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"password",
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"password",
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"password",
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"passwordPASSWORDpassword",
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"pass\0word",
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};
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static const size_t slen[MAX_TESTS] =
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{ 4, 4, 4, 36, 5 };
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static const unsigned char salt[MAX_TESTS][40] =
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{
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"salt",
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"salt",
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"salt",
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"saltSALTsaltSALTsaltSALTsaltSALTsalt",
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"sa\0lt",
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};
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static const uint32_t it_cnt[MAX_TESTS] =
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{ 1, 2, 4096, 4096, 4096 };
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static const uint32_t key_len[MAX_TESTS] =
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{ 20, 20, 20, 25, 16 };
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static const unsigned char result_key[MAX_TESTS][32] =
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{
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{ 0x0c, 0x60, 0xc8, 0x0f, 0x96, 0x1f, 0x0e, 0x71,
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0xf3, 0xa9, 0xb5, 0x24, 0xaf, 0x60, 0x12, 0x06,
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0x2f, 0xe0, 0x37, 0xa6 },
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{ 0xea, 0x6c, 0x01, 0x4d, 0xc7, 0x2d, 0x6f, 0x8c,
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0xcd, 0x1e, 0xd9, 0x2a, 0xce, 0x1d, 0x41, 0xf0,
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0xd8, 0xde, 0x89, 0x57 },
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{ 0x4b, 0x00, 0x79, 0x01, 0xb7, 0x65, 0x48, 0x9a,
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0xbe, 0xad, 0x49, 0xd9, 0x26, 0xf7, 0x21, 0xd0,
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0x65, 0xa4, 0x29, 0xc1 },
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{ 0x3d, 0x2e, 0xec, 0x4f, 0xe4, 0x1c, 0x84, 0x9b,
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0x80, 0xc8, 0xd8, 0x36, 0x62, 0xc0, 0xe4, 0x4a,
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0x8b, 0x29, 0x1a, 0x96, 0x4c, 0xf2, 0xf0, 0x70,
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0x38 },
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{ 0x56, 0xfa, 0x6a, 0xa7, 0x55, 0x48, 0x09, 0x9d,
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0xcc, 0x37, 0xd7, 0xf0, 0x34, 0x25, 0xe0, 0xc3 },
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};
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int mbedtls_pkcs5_self_test( int verbose )
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{
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mbedtls_md_context_t sha1_ctx;
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const mbedtls_md_info_t *info_sha1;
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int ret, i;
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unsigned char key[64];
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mbedtls_md_init( &sha1_ctx );
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info_sha1 = mbedtls_md_info_from_type( MBEDTLS_MD_SHA1 );
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if( info_sha1 == NULL )
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{
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ret = 1;
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goto exit;
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}
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if( ( ret = mbedtls_md_setup( &sha1_ctx, info_sha1, 1 ) ) != 0 )
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{
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ret = 1;
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goto exit;
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}
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for( i = 0; i < MAX_TESTS; i++ )
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{
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if( verbose != 0 )
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mbedtls_printf( " PBKDF2 (SHA1) #%d: ", i );
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ret = mbedtls_pkcs5_pbkdf2_hmac( &sha1_ctx, password[i], plen[i], salt[i],
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slen[i], it_cnt[i], key_len[i], key );
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if( ret != 0 ||
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memcmp( result_key[i], key, key_len[i] ) != 0 )
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{
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if( verbose != 0 )
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mbedtls_printf( "failed\n" );
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ret = 1;
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goto exit;
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}
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if( verbose != 0 )
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mbedtls_printf( "passed\n" );
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}
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if( verbose != 0 )
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mbedtls_printf( "\n" );
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exit:
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mbedtls_md_free( &sha1_ctx );
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return( ret );
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}
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#endif /* MBEDTLS_SHA1_C */
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#endif /* MBEDTLS_SELF_TEST */
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#endif /* MBEDTLS_PKCS5_C */
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