e_des.c revision 296341 
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, size_t 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, size_t inl)
88{
89    while (inl >= EVP_MAXCHUNK) {
90        DES_ofb64_encrypt(in, out, (long)EVP_MAXCHUNK, ctx->cipher_data,
91                          (DES_cblock *)ctx->iv, &ctx->num);
92        inl -= EVP_MAXCHUNK;
93        in += EVP_MAXCHUNK;
94        out += EVP_MAXCHUNK;
95    }
96    if (inl)
97        DES_ofb64_encrypt(in, out, (long)inl, ctx->cipher_data,
98                          (DES_cblock *)ctx->iv, &ctx->num);
99    return 1;
100}
101
102static int des_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
103                          const unsigned char *in, size_t inl)
104{
105    while (inl >= EVP_MAXCHUNK) {
106        DES_ncbc_encrypt(in, out, (long)EVP_MAXCHUNK, ctx->cipher_data,
107                         (DES_cblock *)ctx->iv, ctx->encrypt);
108        inl -= EVP_MAXCHUNK;
109        in += EVP_MAXCHUNK;
110        out += EVP_MAXCHUNK;
111    }
112    if (inl)
113        DES_ncbc_encrypt(in, out, (long)inl, ctx->cipher_data,
114                         (DES_cblock *)ctx->iv, ctx->encrypt);
115    return 1;
116}
117
118static int des_cfb64_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
119                            const unsigned char *in, size_t inl)
120{
121    while (inl >= EVP_MAXCHUNK) {
122        DES_cfb64_encrypt(in, out, (long)EVP_MAXCHUNK, ctx->cipher_data,
123                          (DES_cblock *)ctx->iv, &ctx->num, ctx->encrypt);
124        inl -= EVP_MAXCHUNK;
125        in += EVP_MAXCHUNK;
126        out += EVP_MAXCHUNK;
127    }
128    if (inl)
129        DES_cfb64_encrypt(in, out, (long)inl, ctx->cipher_data,
130                          (DES_cblock *)ctx->iv, &ctx->num, ctx->encrypt);
131    return 1;
132}
133
134/*
135 * Although we have a CFB-r implementation for DES, it doesn't pack the right
136 * way, so wrap it here
137 */
138static int des_cfb1_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
139                           const unsigned char *in, size_t inl)
140{
141    size_t n, chunk = EVP_MAXCHUNK / 8;
142    unsigned char c[1], d[1];
143
144    if (inl < chunk)
145        chunk = inl;
146
147    while (inl && inl >= chunk) {
148        for (n = 0; n < chunk * 8; ++n) {
149            c[0] = (in[n / 8] & (1 << (7 - n % 8))) ? 0x80 : 0;
150            DES_cfb_encrypt(c, d, 1, 1, ctx->cipher_data,
151                            (DES_cblock *)ctx->iv, ctx->encrypt);
152            out[n / 8] =
153                (out[n / 8] & ~(0x80 >> (unsigned int)(n % 8))) |
154                ((d[0] & 0x80) >> (unsigned int)(n % 8));
155        }
156        inl -= chunk;
157        in += chunk;
158        out += chunk;
159        if (inl < chunk)
160            chunk = inl;
161    }
162
163    return 1;
164}
165
166static int des_cfb8_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
167                           const unsigned char *in, size_t inl)
168{
169    while (inl >= EVP_MAXCHUNK) {
170        DES_cfb_encrypt(in, out, 8, (long)EVP_MAXCHUNK, ctx->cipher_data,
171                        (DES_cblock *)ctx->iv, ctx->encrypt);
172        inl -= EVP_MAXCHUNK;
173        in += EVP_MAXCHUNK;
174        out += EVP_MAXCHUNK;
175    }
176    if (inl)
177        DES_cfb_encrypt(in, out, 8, (long)inl, ctx->cipher_data,
178                        (DES_cblock *)ctx->iv, ctx->encrypt);
179    return 1;
180}
181
182BLOCK_CIPHER_defs(des, DES_key_schedule, NID_des, 8, 8, 8, 64,
183                  EVP_CIPH_RAND_KEY, des_init_key, NULL,
184                  EVP_CIPHER_set_asn1_iv, EVP_CIPHER_get_asn1_iv, des_ctrl)
185
186
187BLOCK_CIPHER_def_cfb(des, DES_key_schedule, NID_des, 8, 8, 1,
188                 EVP_CIPH_RAND_KEY, des_init_key, NULL,
189                 EVP_CIPHER_set_asn1_iv, EVP_CIPHER_get_asn1_iv, des_ctrl)
190
191BLOCK_CIPHER_def_cfb(des, DES_key_schedule, NID_des, 8, 8, 8,
192                     EVP_CIPH_RAND_KEY, des_init_key, NULL,
193                     EVP_CIPHER_set_asn1_iv, EVP_CIPHER_get_asn1_iv, des_ctrl)
194
195static int des_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
196                        const unsigned char *iv, int enc)
197{
198    DES_cblock *deskey = (DES_cblock *)key;
199# ifdef EVP_CHECK_DES_KEY
200    if (DES_set_key_checked(deskey, ctx->cipher_data) != 0)
201        return 0;
202# else
203    DES_set_key_unchecked(deskey, ctx->cipher_data);
204# endif
205    return 1;
206}
207
208static int des_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
209{
210
211    switch (type) {
212    case EVP_CTRL_RAND_KEY:
213        if (RAND_bytes(ptr, 8) <= 0)
214            return 0;
215        DES_set_odd_parity((DES_cblock *)ptr);
216        return 1;
217
218    default:
219        return -1;
220    }
221}
222
223#endif
224