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/*
* Copyright 1999-2021 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include <stdlib.h>
#include "internal/cryptlib.h"
#include <openssl/x509.h>
#include <openssl/evp.h>
#include <openssl/core_names.h>
#include <openssl/kdf.h>
/*
* Doesn't do anything now: Builtin PBE algorithms in static table.
*/
void PKCS5_PBE_add(void)
{
}
int PKCS5_PBE_keyivgen_ex(EVP_CIPHER_CTX *cctx, const char *pass, int passlen,
ASN1_TYPE *param, const EVP_CIPHER *cipher,
const EVP_MD *md, int en_de, OSSL_LIB_CTX *libctx,
const char *propq)
{
unsigned char md_tmp[EVP_MAX_MD_SIZE];
unsigned char key[EVP_MAX_KEY_LENGTH], iv[EVP_MAX_IV_LENGTH];
int ivl, kl;
PBEPARAM *pbe = NULL;
int saltlen, iter;
unsigned char *salt;
int mdsize;
int rv = 0;
EVP_KDF *kdf;
EVP_KDF_CTX *kctx = NULL;
OSSL_PARAM params[5], *p = params;
const char *mdname = EVP_MD_name(md);
/* Extract useful info from parameter */
if (param == NULL || param->type != V_ASN1_SEQUENCE ||
param->value.sequence == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_DECODE_ERROR);
return 0;
}
pbe = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBEPARAM), param);
if (pbe == NULL) {
ERR_raise(ERR_LIB_EVP, EVP_R_DECODE_ERROR);
return 0;
}
ivl = EVP_CIPHER_get_iv_length(cipher);
if (ivl < 0 || ivl > 16) {
ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_IV_LENGTH);
goto err;
}
kl = EVP_CIPHER_get_key_length(cipher);
if (kl < 0 || kl > (int)sizeof(md_tmp)) {
ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_KEY_LENGTH);
goto err;
}
if (pbe->iter == NULL)
iter = 1;
else
iter = ASN1_INTEGER_get(pbe->iter);
salt = pbe->salt->data;
saltlen = pbe->salt->length;
if (pass == NULL)
passlen = 0;
else if (passlen == -1)
passlen = strlen(pass);
mdsize = EVP_MD_get_size(md);
if (mdsize < 0)
goto err;
kdf = EVP_KDF_fetch(libctx, OSSL_KDF_NAME_PBKDF1, propq);
kctx = EVP_KDF_CTX_new(kdf);
EVP_KDF_free(kdf);
if (kctx == NULL)
goto err;
*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_PASSWORD,
(char *)pass, (size_t)passlen);
*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SALT,
salt, saltlen);
*p++ = OSSL_PARAM_construct_int(OSSL_KDF_PARAM_ITER, &iter);
*p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
(char *)mdname, 0);
*p = OSSL_PARAM_construct_end();
if (EVP_KDF_derive(kctx, md_tmp, mdsize, params) != 1)
goto err;
memcpy(key, md_tmp, kl);
memcpy(iv, md_tmp + (16 - ivl), ivl);
if (!EVP_CipherInit_ex(cctx, cipher, NULL, key, iv, en_de))
goto err;
OPENSSL_cleanse(md_tmp, EVP_MAX_MD_SIZE);
OPENSSL_cleanse(key, EVP_MAX_KEY_LENGTH);
OPENSSL_cleanse(iv, EVP_MAX_IV_LENGTH);
rv = 1;
err:
EVP_KDF_CTX_free(kctx);
PBEPARAM_free(pbe);
return rv;
}
int PKCS5_PBE_keyivgen(EVP_CIPHER_CTX *cctx, const char *pass, int passlen,
ASN1_TYPE *param, const EVP_CIPHER *cipher,
const EVP_MD *md, int en_de)
{
return PKCS5_PBE_keyivgen_ex(cctx, pass, passlen, param, cipher, md, en_de,
NULL, NULL);
}
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