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
16 static int null_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
17 const unsigned char *iv, int enc);
18 static int null_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
19 const unsigned char *in, size_t inl);
20 static 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
EVP_enc_null(void)34 const EVP_CIPHER *EVP_enc_null(void)
35 {
36 return &n_cipher;
37 }
38
null_init_key(EVP_CIPHER_CTX * ctx,const unsigned char * key,const unsigned char * iv,int enc)39 static 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
null_cipher(EVP_CIPHER_CTX * ctx,unsigned char * out,const unsigned char * in,size_t inl)45 static 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
