1 /* $OpenBSD: e_null.c,v 1.21 2024/04/09 13:52:41 beck Exp $ */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59 #include <stdio.h>
60 #include <string.h>
61
62 #include <openssl/evp.h>
63 #include <openssl/objects.h>
64
65 #include "evp_local.h"
66
67 static int null_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
68 const unsigned char *iv, int enc);
69 static int null_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
70 const unsigned char *in, size_t inl);
71
72 static const EVP_CIPHER n_cipher = {
73 .nid = NID_undef,
74 .block_size = 1,
75 .key_len = 0,
76 .iv_len = 0,
77 .flags = 0,
78 .init = null_init_key,
79 .do_cipher = null_cipher,
80 .cleanup = NULL,
81 .ctx_size = 0,
82 .set_asn1_parameters = NULL,
83 .get_asn1_parameters = NULL,
84 .ctrl = NULL,
85 };
86
87 const EVP_CIPHER *
EVP_enc_null(void)88 EVP_enc_null(void)
89 {
90 return (&n_cipher);
91 }
92 LCRYPTO_ALIAS(EVP_enc_null);
93
94 static int
null_init_key(EVP_CIPHER_CTX * ctx,const unsigned char * key,const unsigned char * iv,int enc)95 null_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
96 const unsigned char *iv, int enc)
97 {
98 /* memset(&(ctx->c),0,sizeof(ctx->c));*/
99 return 1;
100 }
101
102 static int
null_cipher(EVP_CIPHER_CTX * ctx,unsigned char * out,const unsigned char * in,size_t inl)103 null_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
104 const unsigned char *in, size_t inl)
105 {
106 if (in != out)
107 memcpy((char *)out, (const char *)in, inl);
108 return 1;
109 }
110