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1/* crypto/evp/e_des.c */
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 "cryptlib.h"
61#ifndef OPENSSL_NO_DES
62#include <openssl/evp.h>
63#include <openssl/objects.h>
64#include "evp_locl.h"
65#include <openssl/des.h>
66#include <openssl/rand.h>
67
68static int des_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
69 const unsigned char *iv, int enc);
70static int des_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
71
72/* Because of various casts and different names can't use IMPLEMENT_BLOCK_CIPHER */
73
74static int des_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
75 const unsigned char *in, unsigned int inl)
76{
77 BLOCK_CIPHER_ecb_loop()
78 DES_ecb_encrypt((DES_cblock *)(in + i), (DES_cblock *)(out + i), ctx->cipher_data, ctx->encrypt);
79 return 1;
80}
81
82static int des_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
83 const unsigned char *in, unsigned int inl)
84{
85 DES_ofb64_encrypt(in, out, (long)inl, ctx->cipher_data, (DES_cblock *)ctx->iv, &ctx->num);
86 return 1;
87}
88
89static int des_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
90 const unsigned char *in, unsigned int inl)
91{
92 DES_ncbc_encrypt(in, out, (long)inl, ctx->cipher_data,
93 (DES_cblock *)ctx->iv, ctx->encrypt);
94 return 1;
95}
96
97static int des_cfb64_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
98 const unsigned char *in, unsigned int inl)
99{
100 DES_cfb64_encrypt(in, out, (long)inl, ctx->cipher_data,
101 (DES_cblock *)ctx->iv, &ctx->num, ctx->encrypt);
102 return 1;
103}
104
105/* Although we have a CFB-r implementation for DES, it doesn't pack the right
106 way, so wrap it here */
107static int des_cfb1_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
108 const unsigned char *in, unsigned int inl)
109 {
110 unsigned int n;
111 unsigned char c[1],d[1];
112
113 for(n=0 ; n < inl ; ++n)
114 {
115 c[0]=(in[n/8]&(1 << (7-n%8))) ? 0x80 : 0;
116 DES_cfb_encrypt(c,d,1,1,ctx->cipher_data,(DES_cblock *)ctx->iv,
117 ctx->encrypt);
118 out[n/8]=(out[n/8]&~(0x80 >> (n%8)))|((d[0]&0x80) >> (n%8));
119 }
120 return 1;
121 }
122
123static int des_cfb8_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
124 const unsigned char *in, unsigned int inl)
125 {
126 DES_cfb_encrypt(in,out,8,inl,ctx->cipher_data,(DES_cblock *)ctx->iv,
127 ctx->encrypt);
128 return 1;
129 }
130
131BLOCK_CIPHER_defs(des, DES_key_schedule, NID_des, 8, 8, 8, 64,
132 EVP_CIPH_RAND_KEY,
133 des_init_key, NULL,
134 EVP_CIPHER_set_asn1_iv,
135 EVP_CIPHER_get_asn1_iv,
136 des_ctrl)
137
138BLOCK_CIPHER_def_cfb(des,DES_key_schedule,NID_des,8,8,1,
139 EVP_CIPH_RAND_KEY,
140 des_init_key, NULL,
141 EVP_CIPHER_set_asn1_iv,
142 EVP_CIPHER_get_asn1_iv,des_ctrl)
143
144BLOCK_CIPHER_def_cfb(des,DES_key_schedule,NID_des,8,8,8,
145 EVP_CIPH_RAND_KEY,
146 des_init_key,NULL,
147 EVP_CIPHER_set_asn1_iv,
148 EVP_CIPHER_get_asn1_iv,des_ctrl)
149
150static int des_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
151 const unsigned char *iv, int enc)
152 {
153 DES_cblock *deskey = (DES_cblock *)key;
154#ifdef EVP_CHECK_DES_KEY
155 if(DES_set_key_checked(deskey,ctx->cipher_data) != 0)
156 return 0;
157#else
158 DES_set_key_unchecked(deskey,ctx->cipher_data);
159#endif
160 return 1;
161 }
162
163static int des_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
164 {
165
166 switch(type)
167 {
168 case EVP_CTRL_RAND_KEY:
169 if (RAND_bytes(ptr, 8) <= 0)
170 return 0;
171 DES_set_odd_parity((DES_cblock *)ptr);
172 return 1;
173
174 default:
175 return -1;
176 }
177 }
178
179#endif
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