/*

 * 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 "internal/cryptlib.h"

#include <openssl/asn1t.h>

#include <openssl/x509.h>

#include <openssl/rand.h>

/* PKCS#5 password based encryption structure */

ASN1_SEQUENCE(PBEPARAM) = {

        ASN1_SIMPLE(PBEPARAM, salt, ASN1_OCTET_STRING),

        ASN1_SIMPLE(PBEPARAM, iter, ASN1_INTEGER)

} ASN1_SEQUENCE_END(PBEPARAM)

IMPLEMENT_ASN1_FUNCTIONS(PBEPARAM)

/* Set an algorithm identifier for a PKCS#5 PBE algorithm */

int PKCS5_pbe_set0_algor_ex(X509_ALGOR *algor, int alg, int iter,

                            const unsigned char *salt, int saltlen,

                            OSSL_LIB_CTX *ctx)

{

    PBEPARAM *pbe = NULL;

    ASN1_STRING *pbe_str = NULL;

    unsigned char *sstr = NULL;

    pbe = PBEPARAM_new();

    if (pbe == NULL) {

        /* ERR_R_ASN1_LIB, because PBEPARAM_new() is defined in crypto/asn1 */

        ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB);

        goto err;

    }

    if (iter <= 0)

        iter = PKCS5_DEFAULT_ITER;

    if (!ASN1_INTEGER_set(pbe->iter, iter)) {

        ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB);

        goto err;

    }

    if (!saltlen)

        saltlen = PKCS5_SALT_LEN;

    if (saltlen < 0)

        goto err;

    sstr = OPENSSL_malloc(saltlen);

    if (sstr == NULL)

        goto err;

    if (salt)

        memcpy(sstr, salt, saltlen);

    else if (RAND_bytes_ex(ctx, sstr, saltlen, 0) <= 0)

        goto err;

    ASN1_STRING_set0(pbe->salt, sstr, saltlen);

    sstr = NULL;

    if (!ASN1_item_pack(pbe, ASN1_ITEM_rptr(PBEPARAM), &pbe_str)) {

        ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB);

        goto err;

    }

    PBEPARAM_free(pbe);

    pbe = NULL;

    if (X509_ALGOR_set0(algor, OBJ_nid2obj(alg), V_ASN1_SEQUENCE, pbe_str))

        return 1;

 err:

    OPENSSL_free(sstr);

    PBEPARAM_free(pbe);

    ASN1_STRING_free(pbe_str);

    return 0;

}

int PKCS5_pbe_set0_algor(X509_ALGOR *algor, int alg, int iter,

                         const unsigned char *salt, int saltlen)

{

    return PKCS5_pbe_set0_algor_ex(algor, alg, iter, salt, saltlen, NULL);

}

/* Return an algorithm identifier for a PKCS#5 PBE algorithm */

X509_ALGOR *PKCS5_pbe_set_ex(int alg, int iter,

                             const unsigned char *salt, int saltlen,

                             OSSL_LIB_CTX *ctx)

{

    X509_ALGOR *ret;

    ret = X509_ALGOR_new();

    if (ret == NULL) {

        ERR_raise(ERR_LIB_ASN1, ERR_R_X509_LIB);

        return NULL;

    }

    if (PKCS5_pbe_set0_algor_ex(ret, alg, iter, salt, saltlen, ctx))

        return ret;

    X509_ALGOR_free(ret);

    return NULL;

}

X509_ALGOR *PKCS5_pbe_set(int alg, int iter,

                          const unsigned char *salt, int saltlen)

{

    return PKCS5_pbe_set_ex(alg, iter, salt, saltlen, NULL);

}