e_des.c revision 296465 
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/*
73 * Because of various casts and different names can't use
74 * IMPLEMENT_BLOCK_CIPHER
75 */
76
77static int des_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
78                          const unsigned char *in, unsigned int inl)
79{
80    BLOCK_CIPHER_ecb_loop()
81        DES_ecb_encrypt((DES_cblock *)(in + i), (DES_cblock *)(out + i),
82                        ctx->cipher_data, ctx->encrypt);
83    return 1;
84}
85
86static int des_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
87                          const unsigned char *in, unsigned int inl)
88{
89    DES_ofb64_encrypt(in, out, (long)inl, ctx->cipher_data,
90                      (DES_cblock *)ctx->iv, &ctx->num);
91    return 1;
92}
93
94static int des_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
95                          const unsigned char *in, unsigned int inl)
96{
97    DES_ncbc_encrypt(in, out, (long)inl, ctx->cipher_data,
98                     (DES_cblock *)ctx->iv, ctx->encrypt);
99    return 1;
100}
101
102static int des_cfb64_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
103                            const unsigned char *in, unsigned int inl)
104{
105    DES_cfb64_encrypt(in, out, (long)inl, ctx->cipher_data,
106                      (DES_cblock *)ctx->iv, &ctx->num, ctx->encrypt);
107    return 1;
108}
109
110/*
111 * Although we have a CFB-r implementation for DES, it doesn't pack the right
112 * way, so wrap it here
113 */
114static int des_cfb1_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
115                           const unsigned char *in, unsigned int inl)
116{
117    unsigned int n;
118    unsigned char c[1], d[1];
119
120    for (n = 0; n < inl; ++n) {
121        c[0] = (in[n / 8] & (1 << (7 - n % 8))) ? 0x80 : 0;
122        DES_cfb_encrypt(c, d, 1, 1, ctx->cipher_data, (DES_cblock *)ctx->iv,
123                        ctx->encrypt);
124        out[n / 8] =
125            (out[n / 8] & ~(0x80 >> (n % 8))) | ((d[0] & 0x80) >> (n % 8));
126    }
127    return 1;
128}
129
130static int des_cfb8_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
131                           const unsigned char *in, unsigned int inl)
132{
133    DES_cfb_encrypt(in, out, 8, inl, ctx->cipher_data, (DES_cblock *)ctx->iv,
134                    ctx->encrypt);
135    return 1;
136}
137
138BLOCK_CIPHER_defs(des, DES_key_schedule, NID_des, 8, 8, 8, 64,
139                  EVP_CIPH_RAND_KEY,
140                  des_init_key, NULL,
141                  EVP_CIPHER_set_asn1_iv, EVP_CIPHER_get_asn1_iv, des_ctrl)
142
143
144BLOCK_CIPHER_def_cfb(des, DES_key_schedule, NID_des, 8, 8, 1,
145                 EVP_CIPH_RAND_KEY,
146                 des_init_key, NULL,
147                 EVP_CIPHER_set_asn1_iv, EVP_CIPHER_get_asn1_iv, des_ctrl)
148
149BLOCK_CIPHER_def_cfb(des, DES_key_schedule, NID_des, 8, 8, 8,
150                     EVP_CIPH_RAND_KEY,
151                     des_init_key, NULL,
152                     EVP_CIPHER_set_asn1_iv, EVP_CIPHER_get_asn1_iv, des_ctrl)
153
154static int des_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
155                        const unsigned char *iv, int enc)
156{
157    DES_cblock *deskey = (DES_cblock *)key;
158# ifdef EVP_CHECK_DES_KEY
159    if (DES_set_key_checked(deskey, ctx->cipher_data) != 0)
160        return 0;
161# else
162    DES_set_key_unchecked(deskey, ctx->cipher_data);
163# endif
164    return 1;
165}
166
167static int des_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
168{
169
170    switch (type) {
171    case EVP_CTRL_RAND_KEY:
172        if (RAND_bytes(ptr, 8) <= 0)
173            return 0;
174        DES_set_odd_parity((DES_cblock *)ptr);
175        return 1;
176
177    default:
178        return -1;
179    }
180}
181
182#endif
183