xref: /openssl/crypto/evp/e_null.c (revision f5afac4b)
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