/*

 * 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);

}