/*

 * Copyright 1995-2021 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/evp.h>

#include <openssl/objects.h>

#include "crypto/evp.h"

static int null_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,

                         const unsigned char *iv, int enc);

static int null_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,

                       const unsigned char *in, size_t inl);

static const EVP_CIPHER n_cipher = {

    NID_undef,

    1, 0, 0, 0,

    EVP_ORIG_GLOBAL,

    null_init_key,

    null_cipher,

    NULL,

    0,

    NULL,

    NULL,

    NULL,

    NULL

};

const EVP_CIPHER *EVP_enc_null(void)

{

    return &n_cipher;

}

static int null_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,

                         const unsigned char *iv, int enc)

{

    return 1;

}

static int null_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,

                       const unsigned char *in, size_t inl)

{

    if (in != out)

        memcpy(out, in, inl);

    return 1;

}