535 lines
17 KiB
C
535 lines
17 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
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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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* 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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#include "common.h"
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#if defined(MBEDTLS_PKCS5_C)
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#include "mbedtls/pkcs5.h"
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#include "mbedtls/error.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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#include "hash_info.h"
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#include "mbedtls/psa_util.h"
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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 = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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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_ERROR_ADD( 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,
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MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
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return( MBEDTLS_ERROR_ADD( 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_ERROR_ADD( 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_ERROR_ADD( 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_ERROR_ADD( 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_ERROR_ADD( 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_cipher_info_t *cipher_info;
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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_ERROR_ADD( 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,
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&kdf_alg_params ) ) != 0 )
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return( MBEDTLS_ERROR_ADD( 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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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_ERROR_ADD( 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_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_pkcs5_pbkdf2_hmac_ext( md_type, pwd, pwdlen, salt.p,
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salt.len, iterations, keylen,
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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,
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(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_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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#if defined(MBEDTLS_MD_C)
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static int pkcs5_pbkdf2_hmac( mbedtls_md_context_t *ctx,
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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 = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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int 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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if( ( ret = mbedtls_md_hmac_starts( ctx, password, plen ) ) != 0 )
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return( ret );
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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_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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if( ( ret = mbedtls_md_hmac_reset( ctx ) ) != 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_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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if( ( ret = mbedtls_md_hmac_reset( ctx ) ) != 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_DEPRECATED_REMOVED)
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int mbedtls_pkcs5_pbkdf2_hmac( mbedtls_md_context_t *ctx,
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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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return( pkcs5_pbkdf2_hmac( ctx, password, plen, salt, slen, iteration_count,
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key_length, output ) );
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}
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#endif
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#endif /* MBEDTLS_MD_C */
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int mbedtls_pkcs5_pbkdf2_hmac_ext( mbedtls_md_type_t md_alg,
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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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#if defined(MBEDTLS_MD_C)
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mbedtls_md_context_t md_ctx;
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const mbedtls_md_info_t *md_info = NULL;
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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md_info = mbedtls_md_info_from_type( md_alg );
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if( md_info == NULL )
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return( MBEDTLS_ERR_PKCS5_FEATURE_UNAVAILABLE );
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mbedtls_md_init( &md_ctx );
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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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ret = pkcs5_pbkdf2_hmac( &md_ctx, password, plen, salt, slen,
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iteration_count, key_length, output );
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exit:
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mbedtls_md_free( &md_ctx );
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return( ret );
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#else
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int j;
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unsigned int i;
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unsigned char md1[PSA_HASH_MAX_SIZE];
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unsigned char work[PSA_HASH_MAX_SIZE];
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const unsigned char md_size = mbedtls_hash_info_get_size( md_alg );
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psa_mac_operation_t operation = PSA_MAC_OPERATION_INIT;
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psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
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psa_status_t status_destruction = PSA_ERROR_CORRUPTION_DETECTED;
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size_t use_len, out_len;
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unsigned char *out_p = output;
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unsigned char counter[4];
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mbedtls_svc_key_id_t psa_hmac_key = MBEDTLS_SVC_KEY_ID_INIT;
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psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
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const psa_algorithm_t alg = PSA_ALG_HMAC( mbedtls_hash_info_psa_from_md( md_alg ) );
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const size_t out_size = PSA_MAC_LENGTH( PSA_KEY_TYPE_HMAC, 0, alg );
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memset( counter, 0, sizeof( counter ) );
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counter[3] = 1;
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psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_SIGN_MESSAGE );
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psa_set_key_algorithm( &attributes, alg );
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psa_set_key_type( &attributes, PSA_KEY_TYPE_HMAC );
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if( key_length == 0 )
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return 0;
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if( ( status = psa_import_key( &attributes,
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password, plen,
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&psa_hmac_key ) ) != PSA_SUCCESS )
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{
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return MBEDTLS_ERR_PKCS5_BAD_INPUT_DATA;
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}
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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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status = psa_mac_sign_setup( &operation, psa_hmac_key,
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PSA_ALG_HMAC( alg ) );
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if( status != PSA_SUCCESS )
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goto cleanup;
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// U1 ends up in work
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if( ( status = psa_mac_update( &operation, salt, slen ) ) != PSA_SUCCESS )
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goto cleanup;
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if( ( status = psa_mac_update( &operation, counter, sizeof( counter ) ) ) != PSA_SUCCESS )
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goto cleanup;
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if( ( status = psa_mac_sign_finish( &operation, work, out_size, &out_len ) )
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!= PSA_SUCCESS )
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goto cleanup;
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memcpy( md1, work, out_len );
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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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status = psa_mac_sign_setup( &operation, psa_hmac_key,
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PSA_ALG_HMAC( alg ) );
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if( status != PSA_SUCCESS )
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goto cleanup;
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if( ( status = psa_mac_update( &operation, md1, md_size ) ) != PSA_SUCCESS )
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goto cleanup;
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if( ( status = psa_mac_sign_finish( &operation, md1, out_size, &out_len ) ) != PSA_SUCCESS )
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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, PSA_HASH_MAX_SIZE );
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mbedtls_platform_zeroize( md1, PSA_HASH_MAX_SIZE );
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status_destruction = psa_destroy_key( psa_hmac_key );
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if( status == PSA_SUCCESS && status_destruction != PSA_SUCCESS )
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status = status_destruction;
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status_destruction = psa_mac_abort( &operation );
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if( status == PSA_SUCCESS && status_destruction != PSA_SUCCESS )
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status = status_destruction;
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return( mbedtls_md_error_from_psa( status ) );
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#endif /* !MBEDTLS_MD_C */
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}
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#if defined(MBEDTLS_SELF_TEST)
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#if !defined(MBEDTLS_HAS_ALG_SHA_1_VIA_MD_OR_PSA)
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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_test_data[MAX_TESTS] =
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{ 8, 8, 8, 24, 9 };
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static const unsigned char password_test_data[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_test_data[MAX_TESTS] =
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{ 4, 4, 4, 36, 5 };
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static const unsigned char salt_test_data[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",
|
|
"sa\0lt",
|
|
};
|
|
|
|
static const uint32_t it_cnt_test_data[MAX_TESTS] =
|
|
{ 1, 2, 4096, 4096, 4096 };
|
|
|
|
static const uint32_t key_len_test_data[MAX_TESTS] =
|
|
{ 20, 20, 20, 25, 16 };
|
|
|
|
static const unsigned char result_key_test_data[MAX_TESTS][32] =
|
|
{
|
|
{ 0x0c, 0x60, 0xc8, 0x0f, 0x96, 0x1f, 0x0e, 0x71,
|
|
0xf3, 0xa9, 0xb5, 0x24, 0xaf, 0x60, 0x12, 0x06,
|
|
0x2f, 0xe0, 0x37, 0xa6 },
|
|
{ 0xea, 0x6c, 0x01, 0x4d, 0xc7, 0x2d, 0x6f, 0x8c,
|
|
0xcd, 0x1e, 0xd9, 0x2a, 0xce, 0x1d, 0x41, 0xf0,
|
|
0xd8, 0xde, 0x89, 0x57 },
|
|
{ 0x4b, 0x00, 0x79, 0x01, 0xb7, 0x65, 0x48, 0x9a,
|
|
0xbe, 0xad, 0x49, 0xd9, 0x26, 0xf7, 0x21, 0xd0,
|
|
0x65, 0xa4, 0x29, 0xc1 },
|
|
{ 0x3d, 0x2e, 0xec, 0x4f, 0xe4, 0x1c, 0x84, 0x9b,
|
|
0x80, 0xc8, 0xd8, 0x36, 0x62, 0xc0, 0xe4, 0x4a,
|
|
0x8b, 0x29, 0x1a, 0x96, 0x4c, 0xf2, 0xf0, 0x70,
|
|
0x38 },
|
|
{ 0x56, 0xfa, 0x6a, 0xa7, 0x55, 0x48, 0x09, 0x9d,
|
|
0xcc, 0x37, 0xd7, 0xf0, 0x34, 0x25, 0xe0, 0xc3 },
|
|
};
|
|
|
|
int mbedtls_pkcs5_self_test( int verbose )
|
|
{
|
|
int ret, i;
|
|
unsigned char key[64];
|
|
|
|
for( i = 0; i < MAX_TESTS; i++ )
|
|
{
|
|
if( verbose != 0 )
|
|
mbedtls_printf( " PBKDF2 (SHA1) #%d: ", i );
|
|
|
|
ret = mbedtls_pkcs5_pbkdf2_hmac_ext( MBEDTLS_MD_SHA1, password_test_data[i],
|
|
plen_test_data[i], salt_test_data[i],
|
|
slen_test_data[i], it_cnt_test_data[i],
|
|
key_len_test_data[i], key );
|
|
if( ret != 0 ||
|
|
memcmp( result_key_test_data[i], key, key_len_test_data[i] ) != 0 )
|
|
{
|
|
if( verbose != 0 )
|
|
mbedtls_printf( "failed\n" );
|
|
|
|
ret = 1;
|
|
goto exit;
|
|
}
|
|
|
|
if( verbose != 0 )
|
|
mbedtls_printf( "passed\n" );
|
|
}
|
|
|
|
if( verbose != 0 )
|
|
mbedtls_printf( "\n" );
|
|
|
|
exit:
|
|
return( ret );
|
|
}
|
|
#endif /* MBEDTLS_HAS_ALG_SHA_1_VIA_MD_OR_PSA */
|
|
|
|
#endif /* MBEDTLS_SELF_TEST */
|
|
|
|
#endif /* MBEDTLS_PKCS5_C */
|