1/*
2 * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License").  You may not use
5 * this file except in compliance with the License.  You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include <stdio.h>
11#include "internal/cryptlib.h"
12#include <openssl/evp.h>
13#include <openssl/objects.h>
14#include "crypto/evp.h"
15
16static int null_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
17                         const unsigned char *iv, int enc);
18static int null_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
19                       const unsigned char *in, size_t inl);
20static const EVP_CIPHER n_cipher = {
21    NID_undef,
22    1, 0, 0, 0,
23    EVP_ORIG_GLOBAL,
24    null_init_key,
25    null_cipher,
26    NULL,
27    0,
28    NULL,
29    NULL,
30    NULL,
31    NULL
32};
33
34const EVP_CIPHER *EVP_enc_null(void)
35{
36    return &n_cipher;
37}
38
39static int null_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
40                         const unsigned char *iv, int enc)
41{
42    return 1;
43}
44
45static int null_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
46                       const unsigned char *in, size_t inl)
47{
48    if (in != out)
49        memcpy(out, in, inl);
50    return 1;
51}
52