[398] | 1 | /**
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| 2 | * \file pkcs5.c
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| 3 | *
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| 4 | * \brief PKCS#5 functions
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| 5 | *
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| 6 | * \author Mathias Olsson <mathias@kompetensum.com>
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| 7 | *
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| 8 | * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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| 9 | * SPDX-License-Identifier: Apache-2.0
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| 10 | *
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| 11 | * Licensed under the Apache License, Version 2.0 (the "License"); you may
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| 12 | * not use this file except in compliance with the License.
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| 13 | * You may obtain a copy of the License at
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| 14 | *
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| 15 | * http://www.apache.org/licenses/LICENSE-2.0
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| 16 | *
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| 17 | * Unless required by applicable law or agreed to in writing, software
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| 18 | * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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| 19 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| 20 | * See the License for the specific language governing permissions and
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| 21 | * limitations under the License.
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| 22 | *
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| 23 | * This file is part of mbed TLS (https://tls.mbed.org)
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| 24 | */
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| 25 | /*
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| 26 | * PKCS#5 includes PBKDF2 and more
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| 27 | *
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| 28 | * http://tools.ietf.org/html/rfc2898 (Specification)
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| 29 | * http://tools.ietf.org/html/rfc6070 (Test vectors)
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| 30 | */
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| 31 |
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| 32 | #if !defined(MBEDTLS_CONFIG_FILE)
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| 33 | #include "mbedtls/config.h"
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| 34 | #else
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| 35 | #include MBEDTLS_CONFIG_FILE
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| 36 | #endif
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| 37 |
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| 38 | #if defined(MBEDTLS_PKCS5_C)
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| 39 |
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| 40 | #include "mbedtls/pkcs5.h"
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| 41 |
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| 42 | #if defined(MBEDTLS_ASN1_PARSE_C)
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| 43 | #include "mbedtls/asn1.h"
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| 44 | #include "mbedtls/cipher.h"
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| 45 | #include "mbedtls/oid.h"
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| 46 | #endif /* MBEDTLS_ASN1_PARSE_C */
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| 47 |
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| 48 | #include <string.h>
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| 49 |
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| 50 | #if defined(MBEDTLS_PLATFORM_C)
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| 51 | #include "mbedtls/platform.h"
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| 52 | #else
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| 53 | #include <stdio.h>
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| 54 | #define mbedtls_printf printf
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| 55 | #endif
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| 56 |
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| 57 | #if defined(MBEDTLS_ASN1_PARSE_C)
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| 58 | static int pkcs5_parse_pbkdf2_params( const mbedtls_asn1_buf *params,
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| 59 | mbedtls_asn1_buf *salt, int *iterations,
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| 60 | int *keylen, mbedtls_md_type_t *md_type )
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| 61 | {
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| 62 | int ret;
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| 63 | mbedtls_asn1_buf prf_alg_oid;
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| 64 | unsigned char *p = params->p;
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| 65 | const unsigned char *end = params->p + params->len;
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| 66 |
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| 67 | if( params->tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) )
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| 68 | return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT +
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| 69 | MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
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| 70 | /*
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| 71 | * PBKDF2-params ::= SEQUENCE {
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| 72 | * salt OCTET STRING,
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| 73 | * iterationCount INTEGER,
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| 74 | * keyLength INTEGER OPTIONAL
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| 75 | * prf AlgorithmIdentifier DEFAULT algid-hmacWithSHA1
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| 76 | * }
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| 77 | *
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| 78 | */
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| 79 | if( ( ret = mbedtls_asn1_get_tag( &p, end, &salt->len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
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| 80 | return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT + ret );
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| 81 |
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| 82 | salt->p = p;
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| 83 | p += salt->len;
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| 84 |
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| 85 | if( ( ret = mbedtls_asn1_get_int( &p, end, iterations ) ) != 0 )
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| 86 | return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT + ret );
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| 87 |
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| 88 | if( p == end )
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| 89 | return( 0 );
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| 90 |
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| 91 | if( ( ret = mbedtls_asn1_get_int( &p, end, keylen ) ) != 0 )
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| 92 | {
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| 93 | if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
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| 94 | return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT + ret );
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| 95 | }
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| 96 |
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| 97 | if( p == end )
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| 98 | return( 0 );
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| 99 |
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| 100 | if( ( ret = mbedtls_asn1_get_alg_null( &p, end, &prf_alg_oid ) ) != 0 )
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| 101 | return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT + ret );
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| 102 |
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| 103 | if( mbedtls_oid_get_md_hmac( &prf_alg_oid, md_type ) != 0 )
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| 104 | return( MBEDTLS_ERR_PKCS5_FEATURE_UNAVAILABLE );
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| 105 |
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| 106 | if( p != end )
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| 107 | return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT +
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| 108 | MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
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| 109 |
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| 110 | return( 0 );
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| 111 | }
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| 112 |
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| 113 | int mbedtls_pkcs5_pbes2( const mbedtls_asn1_buf *pbe_params, int mode,
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| 114 | const unsigned char *pwd, size_t pwdlen,
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| 115 | const unsigned char *data, size_t datalen,
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| 116 | unsigned char *output )
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| 117 | {
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| 118 | int ret, iterations = 0, keylen = 0;
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| 119 | unsigned char *p, *end;
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| 120 | mbedtls_asn1_buf kdf_alg_oid, enc_scheme_oid, kdf_alg_params, enc_scheme_params;
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| 121 | mbedtls_asn1_buf salt;
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| 122 | mbedtls_md_type_t md_type = MBEDTLS_MD_SHA1;
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| 123 | unsigned char key[32], iv[32];
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| 124 | size_t olen = 0;
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| 125 | const mbedtls_md_info_t *md_info;
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| 126 | const mbedtls_cipher_info_t *cipher_info;
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| 127 | mbedtls_md_context_t md_ctx;
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| 128 | mbedtls_cipher_type_t cipher_alg;
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| 129 | mbedtls_cipher_context_t cipher_ctx;
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| 130 |
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| 131 | p = pbe_params->p;
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| 132 | end = p + pbe_params->len;
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| 133 |
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| 134 | /*
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| 135 | * PBES2-params ::= SEQUENCE {
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| 136 | * keyDerivationFunc AlgorithmIdentifier {{PBES2-KDFs}},
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| 137 | * encryptionScheme AlgorithmIdentifier {{PBES2-Encs}}
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| 138 | * }
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| 139 | */
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| 140 | if( pbe_params->tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) )
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| 141 | return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT +
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| 142 | MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
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| 143 |
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| 144 | if( ( ret = mbedtls_asn1_get_alg( &p, end, &kdf_alg_oid, &kdf_alg_params ) ) != 0 )
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| 145 | return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT + ret );
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| 146 |
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| 147 | // Only PBKDF2 supported at the moment
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| 148 | //
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| 149 | if( MBEDTLS_OID_CMP( MBEDTLS_OID_PKCS5_PBKDF2, &kdf_alg_oid ) != 0 )
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| 150 | return( MBEDTLS_ERR_PKCS5_FEATURE_UNAVAILABLE );
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| 151 |
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| 152 | if( ( ret = pkcs5_parse_pbkdf2_params( &kdf_alg_params,
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| 153 | &salt, &iterations, &keylen,
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| 154 | &md_type ) ) != 0 )
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| 155 | {
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| 156 | return( ret );
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| 157 | }
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| 158 |
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| 159 | md_info = mbedtls_md_info_from_type( md_type );
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| 160 | if( md_info == NULL )
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| 161 | return( MBEDTLS_ERR_PKCS5_FEATURE_UNAVAILABLE );
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| 162 |
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| 163 | if( ( ret = mbedtls_asn1_get_alg( &p, end, &enc_scheme_oid,
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| 164 | &enc_scheme_params ) ) != 0 )
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| 165 | {
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| 166 | return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT + ret );
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| 167 | }
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| 168 |
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| 169 | if( mbedtls_oid_get_cipher_alg( &enc_scheme_oid, &cipher_alg ) != 0 )
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| 170 | return( MBEDTLS_ERR_PKCS5_FEATURE_UNAVAILABLE );
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| 171 |
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| 172 | cipher_info = mbedtls_cipher_info_from_type( cipher_alg );
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| 173 | if( cipher_info == NULL )
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| 174 | return( MBEDTLS_ERR_PKCS5_FEATURE_UNAVAILABLE );
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| 175 |
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| 176 | /*
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| 177 | * The value of keylen from pkcs5_parse_pbkdf2_params() is ignored
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| 178 | * since it is optional and we don't know if it was set or not
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| 179 | */
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| 180 | keylen = cipher_info->key_bitlen / 8;
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| 181 |
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| 182 | if( enc_scheme_params.tag != MBEDTLS_ASN1_OCTET_STRING ||
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| 183 | enc_scheme_params.len != cipher_info->iv_size )
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| 184 | {
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| 185 | return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT );
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| 186 | }
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| 187 |
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| 188 | mbedtls_md_init( &md_ctx );
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| 189 | mbedtls_cipher_init( &cipher_ctx );
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| 190 |
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| 191 | memcpy( iv, enc_scheme_params.p, enc_scheme_params.len );
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| 192 |
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| 193 | if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 )
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| 194 | goto exit;
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| 195 |
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| 196 | if( ( ret = mbedtls_pkcs5_pbkdf2_hmac( &md_ctx, pwd, pwdlen, salt.p, salt.len,
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| 197 | iterations, keylen, key ) ) != 0 )
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| 198 | {
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| 199 | goto exit;
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| 200 | }
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| 201 |
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| 202 | if( ( ret = mbedtls_cipher_setup( &cipher_ctx, cipher_info ) ) != 0 )
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| 203 | goto exit;
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| 204 |
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| 205 | if( ( ret = mbedtls_cipher_setkey( &cipher_ctx, key, 8 * keylen, (mbedtls_operation_t) mode ) ) != 0 )
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| 206 | goto exit;
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| 207 |
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| 208 | if( ( ret = mbedtls_cipher_crypt( &cipher_ctx, iv, enc_scheme_params.len,
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| 209 | data, datalen, output, &olen ) ) != 0 )
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| 210 | ret = MBEDTLS_ERR_PKCS5_PASSWORD_MISMATCH;
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| 211 |
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| 212 | exit:
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| 213 | mbedtls_md_free( &md_ctx );
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| 214 | mbedtls_cipher_free( &cipher_ctx );
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| 215 |
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| 216 | return( ret );
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| 217 | }
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| 218 | #endif /* MBEDTLS_ASN1_PARSE_C */
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| 219 |
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| 220 | int mbedtls_pkcs5_pbkdf2_hmac( mbedtls_md_context_t *ctx, const unsigned char *password,
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| 221 | size_t plen, const unsigned char *salt, size_t slen,
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| 222 | unsigned int iteration_count,
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| 223 | uint32_t key_length, unsigned char *output )
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| 224 | {
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| 225 | int ret, j;
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| 226 | unsigned int i;
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| 227 | unsigned char md1[MBEDTLS_MD_MAX_SIZE];
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| 228 | unsigned char work[MBEDTLS_MD_MAX_SIZE];
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| 229 | unsigned char md_size = mbedtls_md_get_size( ctx->md_info );
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| 230 | size_t use_len;
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| 231 | unsigned char *out_p = output;
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| 232 | unsigned char counter[4];
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| 233 |
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| 234 | memset( counter, 0, 4 );
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| 235 | counter[3] = 1;
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| 236 |
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| 237 | #if UINT_MAX > 0xFFFFFFFF
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| 238 | if( iteration_count > 0xFFFFFFFF )
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| 239 | return( MBEDTLS_ERR_PKCS5_BAD_INPUT_DATA );
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| 240 | #endif
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| 241 |
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| 242 | while( key_length )
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| 243 | {
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| 244 | // U1 ends up in work
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| 245 | //
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| 246 | if( ( ret = mbedtls_md_hmac_starts( ctx, password, plen ) ) != 0 )
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| 247 | return( ret );
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| 248 |
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| 249 | if( ( ret = mbedtls_md_hmac_update( ctx, salt, slen ) ) != 0 )
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| 250 | return( ret );
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| 251 |
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| 252 | if( ( ret = mbedtls_md_hmac_update( ctx, counter, 4 ) ) != 0 )
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| 253 | return( ret );
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| 254 |
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| 255 | if( ( ret = mbedtls_md_hmac_finish( ctx, work ) ) != 0 )
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| 256 | return( ret );
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| 257 |
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| 258 | memcpy( md1, work, md_size );
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| 259 |
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| 260 | for( i = 1; i < iteration_count; i++ )
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| 261 | {
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| 262 | // U2 ends up in md1
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| 263 | //
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| 264 | if( ( ret = mbedtls_md_hmac_starts( ctx, password, plen ) ) != 0 )
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| 265 | return( ret );
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| 266 |
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| 267 | if( ( ret = mbedtls_md_hmac_update( ctx, md1, md_size ) ) != 0 )
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| 268 | return( ret );
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| 269 |
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| 270 | if( ( ret = mbedtls_md_hmac_finish( ctx, md1 ) ) != 0 )
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| 271 | return( ret );
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| 272 |
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| 273 | // U1 xor U2
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| 274 | //
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| 275 | for( j = 0; j < md_size; j++ )
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| 276 | work[j] ^= md1[j];
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| 277 | }
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| 278 |
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| 279 | use_len = ( key_length < md_size ) ? key_length : md_size;
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| 280 | memcpy( out_p, work, use_len );
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| 281 |
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| 282 | key_length -= (uint32_t) use_len;
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| 283 | out_p += use_len;
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| 284 |
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| 285 | for( i = 4; i > 0; i-- )
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| 286 | if( ++counter[i - 1] != 0 )
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| 287 | break;
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| 288 | }
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| 289 |
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| 290 | return( 0 );
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| 291 | }
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| 292 |
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| 293 | #if defined(MBEDTLS_SELF_TEST)
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| 294 |
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| 295 | #if !defined(MBEDTLS_SHA1_C)
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| 296 | int mbedtls_pkcs5_self_test( int verbose )
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| 297 | {
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| 298 | if( verbose != 0 )
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| 299 | mbedtls_printf( " PBKDF2 (SHA1): skipped\n\n" );
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| 300 |
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| 301 | return( 0 );
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| 302 | }
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| 303 | #else
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| 304 |
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| 305 | #define MAX_TESTS 6
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| 306 |
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| 307 | static const size_t plen[MAX_TESTS] =
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| 308 | { 8, 8, 8, 24, 9 };
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| 309 |
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| 310 | static const unsigned char password[MAX_TESTS][32] =
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| 311 | {
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| 312 | "password",
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| 313 | "password",
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| 314 | "password",
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| 315 | "passwordPASSWORDpassword",
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| 316 | "pass\0word",
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| 317 | };
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| 318 |
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| 319 | static const size_t slen[MAX_TESTS] =
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| 320 | { 4, 4, 4, 36, 5 };
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| 321 |
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| 322 | static const unsigned char salt[MAX_TESTS][40] =
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| 323 | {
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| 324 | "salt",
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| 325 | "salt",
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| 326 | "salt",
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| 327 | "saltSALTsaltSALTsaltSALTsaltSALTsalt",
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| 328 | "sa\0lt",
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| 329 | };
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| 330 |
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| 331 | static const uint32_t it_cnt[MAX_TESTS] =
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| 332 | { 1, 2, 4096, 4096, 4096 };
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| 333 |
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| 334 | static const uint32_t key_len[MAX_TESTS] =
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| 335 | { 20, 20, 20, 25, 16 };
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| 336 |
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| 337 | static const unsigned char result_key[MAX_TESTS][32] =
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| 338 | {
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| 339 | { 0x0c, 0x60, 0xc8, 0x0f, 0x96, 0x1f, 0x0e, 0x71,
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| 340 | 0xf3, 0xa9, 0xb5, 0x24, 0xaf, 0x60, 0x12, 0x06,
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| 341 | 0x2f, 0xe0, 0x37, 0xa6 },
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| 342 | { 0xea, 0x6c, 0x01, 0x4d, 0xc7, 0x2d, 0x6f, 0x8c,
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| 343 | 0xcd, 0x1e, 0xd9, 0x2a, 0xce, 0x1d, 0x41, 0xf0,
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| 344 | 0xd8, 0xde, 0x89, 0x57 },
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| 345 | { 0x4b, 0x00, 0x79, 0x01, 0xb7, 0x65, 0x48, 0x9a,
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| 346 | 0xbe, 0xad, 0x49, 0xd9, 0x26, 0xf7, 0x21, 0xd0,
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| 347 | 0x65, 0xa4, 0x29, 0xc1 },
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| 348 | { 0x3d, 0x2e, 0xec, 0x4f, 0xe4, 0x1c, 0x84, 0x9b,
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| 349 | 0x80, 0xc8, 0xd8, 0x36, 0x62, 0xc0, 0xe4, 0x4a,
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| 350 | 0x8b, 0x29, 0x1a, 0x96, 0x4c, 0xf2, 0xf0, 0x70,
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| 351 | 0x38 },
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| 352 | { 0x56, 0xfa, 0x6a, 0xa7, 0x55, 0x48, 0x09, 0x9d,
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| 353 | 0xcc, 0x37, 0xd7, 0xf0, 0x34, 0x25, 0xe0, 0xc3 },
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| 354 | };
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| 355 |
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| 356 | int mbedtls_pkcs5_self_test( int verbose )
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| 357 | {
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| 358 | mbedtls_md_context_t sha1_ctx;
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| 359 | const mbedtls_md_info_t *info_sha1;
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| 360 | int ret, i;
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| 361 | unsigned char key[64];
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| 362 |
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| 363 | mbedtls_md_init( &sha1_ctx );
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| 364 |
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| 365 | info_sha1 = mbedtls_md_info_from_type( MBEDTLS_MD_SHA1 );
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| 366 | if( info_sha1 == NULL )
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| 367 | {
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| 368 | ret = 1;
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| 369 | goto exit;
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| 370 | }
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| 371 |
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| 372 | if( ( ret = mbedtls_md_setup( &sha1_ctx, info_sha1, 1 ) ) != 0 )
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| 373 | {
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| 374 | ret = 1;
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| 375 | goto exit;
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| 376 | }
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| 377 |
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| 378 | for( i = 0; i < MAX_TESTS; i++ )
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| 379 | {
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| 380 | if( verbose != 0 )
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| 381 | mbedtls_printf( " PBKDF2 (SHA1) #%d: ", i );
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| 382 |
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| 383 | ret = mbedtls_pkcs5_pbkdf2_hmac( &sha1_ctx, password[i], plen[i], salt[i],
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| 384 | slen[i], it_cnt[i], key_len[i], key );
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| 385 | if( ret != 0 ||
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| 386 | memcmp( result_key[i], key, key_len[i] ) != 0 )
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| 387 | {
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| 388 | if( verbose != 0 )
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| 389 | mbedtls_printf( "failed\n" );
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| 390 |
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| 391 | ret = 1;
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| 392 | goto exit;
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| 393 | }
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| 394 |
|
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| 395 | if( verbose != 0 )
|
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| 396 | mbedtls_printf( "passed\n" );
|
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| 397 | }
|
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| 398 |
|
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| 399 | if( verbose != 0 )
|
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| 400 | mbedtls_printf( "\n" );
|
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| 401 |
|
---|
| 402 | exit:
|
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| 403 | mbedtls_md_free( &sha1_ctx );
|
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| 404 |
|
---|
| 405 | return( ret );
|
---|
| 406 | }
|
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| 407 | #endif /* MBEDTLS_SHA1_C */
|
---|
| 408 |
|
---|
| 409 | #endif /* MBEDTLS_SELF_TEST */
|
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| 410 |
|
---|
| 411 | #endif /* MBEDTLS_PKCS5_C */
|
---|