mirror of
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500 lines
15 KiB
C
500 lines
15 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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#include "mbedtls/platform.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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/*
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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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}
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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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}
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if (p == end) {
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return 0;
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}
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if ((ret = mbedtls_asn1_get_int(&p, end, keylen)) != 0) {
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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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}
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if (p == end) {
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return 0;
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}
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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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}
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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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}
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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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}
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return 0;
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}
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#if !defined(MBEDTLS_CIPHER_PADDING_PKCS7)
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int mbedtls_pkcs5_pbes2_ext(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, size_t output_size,
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size_t *output_len);
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#endif
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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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size_t output_len = 0;
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/* We assume caller of the function is providing a big enough output buffer
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* so we pass output_size as SIZE_MAX to pass checks, However, no guarantees
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* for the output size actually being correct.
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*/
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return mbedtls_pkcs5_pbes2_ext(pbe_params, mode, pwd, pwdlen, data,
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datalen, output, SIZE_MAX, &output_len);
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}
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int mbedtls_pkcs5_pbes2_ext(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, size_t output_size,
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size_t *output_len)
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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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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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unsigned int padlen = 0;
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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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}
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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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}
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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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}
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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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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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}
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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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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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}
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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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/*
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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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return MBEDTLS_ERR_PKCS5_INVALID_FORMAT;
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}
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if (mode == MBEDTLS_PKCS5_DECRYPT) {
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if (output_size < datalen) {
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return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
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}
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}
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if (mode == MBEDTLS_PKCS5_ENCRYPT) {
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padlen = cipher_info->block_size - (datalen % cipher_info->block_size);
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if (output_size < (datalen + padlen)) {
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return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
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}
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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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}
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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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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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}
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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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}
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#if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING)
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/* PKCS5 uses CBC with PKCS7 padding (which is the same as
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* "PKCS5 padding" except that it's typically only called PKCS5
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* with 64-bit-block ciphers).
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*/
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mbedtls_cipher_padding_t padding = MBEDTLS_PADDING_PKCS7;
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#if !defined(MBEDTLS_CIPHER_PADDING_PKCS7)
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/* For historical reasons, when decrypting, this function works when
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* decrypting even when support for PKCS7 padding is disabled. In this
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* case, it ignores the padding, and so will never report a
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* password mismatch.
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*/
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if (mode == MBEDTLS_DECRYPT) {
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padding = MBEDTLS_PADDING_NONE;
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}
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#endif
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if ((ret = mbedtls_cipher_set_padding_mode(&cipher_ctx, padding)) != 0) {
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goto exit;
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}
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#endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */
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if ((ret = mbedtls_cipher_crypt(&cipher_ctx, iv, enc_scheme_params.len,
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data, datalen, output, output_len)) != 0) {
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ret = MBEDTLS_ERR_PKCS5_PASSWORD_MISMATCH;
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}
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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,
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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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}
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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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}
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while (key_length) {
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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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}
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if ((ret = mbedtls_md_hmac_update(ctx, counter, 4)) != 0) {
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goto cleanup;
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}
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if ((ret = mbedtls_md_hmac_finish(ctx, work)) != 0) {
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goto cleanup;
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}
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if ((ret = mbedtls_md_hmac_reset(ctx)) != 0) {
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goto cleanup;
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}
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memcpy(md1, work, md_size);
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for (i = 1; i < iteration_count; i++) {
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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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}
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if ((ret = mbedtls_md_hmac_finish(ctx, md1)) != 0) {
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goto cleanup;
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}
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if ((ret = mbedtls_md_hmac_reset(ctx)) != 0) {
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goto cleanup;
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}
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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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}
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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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}
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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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}
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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",
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"sa\0lt",
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};
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static const uint32_t it_cnt_test_data[MAX_TESTS] =
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{ 1, 2, 4096, 4096, 4096 };
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static const uint32_t key_len_test_data[MAX_TESTS] =
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{ 20, 20, 20, 25, 16 };
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static const unsigned char result_key_test_data[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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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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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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if (verbose != 0) {
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mbedtls_printf(" PBKDF2 (SHA1) #%d: ", i);
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}
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ret = mbedtls_pkcs5_pbkdf2_hmac(&sha1_ctx, password_test_data[i],
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|
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:
|
|
mbedtls_md_free(&sha1_ctx);
|
|
|
|
return ret;
|
|
}
|
|
#endif /* MBEDTLS_SHA1_C */
|
|
|
|
#endif /* MBEDTLS_SELF_TEST */
|
|
|
|
#endif /* MBEDTLS_PKCS5_C */
|