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
68 static int des_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
69 const unsigned char *iv, int enc);
70 static 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
74 static int des_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
75 const unsigned char *in, size_t 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
82 static int des_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
83 const unsigned char *in, size_t inl)
84 {
85 while(inl>=EVP_MAXCHUNK)
86 {
87 DES_ofb64_encrypt(in, out, (long)EVP_MAXCHUNK, ctx->cipher_data,
88 (DES_cblock *)ctx->iv, &ctx->num);
89 inl-=EVP_MAXCHUNK;
90 in +=EVP_MAXCHUNK;
91 out+=EVP_MAXCHUNK;
92 }
93 if (inl)
94 DES_ofb64_encrypt(in, out, (long)inl, ctx->cipher_data,
95 (DES_cblock *)ctx->iv, &ctx->num);
96 return 1;
97 }
98
99 static int des_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
100 const unsigned char *in, size_t inl)
101 {
102 while(inl>=EVP_MAXCHUNK)
103 {
104 DES_ncbc_encrypt(in, out, (long)EVP_MAXCHUNK, ctx->cipher_data,
105 (DES_cblock *)ctx->iv, ctx->encrypt);
106 inl-=EVP_MAXCHUNK;
107 in +=EVP_MAXCHUNK;
108 out+=EVP_MAXCHUNK;
109 }
110 if (inl)
111 DES_ncbc_encrypt(in, out, (long)inl, ctx->cipher_data,
112 (DES_cblock *)ctx->iv, ctx->encrypt);
113 return 1;
114 }
115
116 static int des_cfb64_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
117 const unsigned char *in, size_t inl)
118 {
119 while(inl>=EVP_MAXCHUNK)
120 {
121 DES_cfb64_encrypt(in,out, (long)EVP_MAXCHUNK, ctx->cipher_data,
122 (DES_cblock *)ctx->iv, &ctx->num, ctx->encrypt);
123 inl-=EVP_MAXCHUNK;
124 in +=EVP_MAXCHUNK;
125 out+=EVP_MAXCHUNK;
126 }
127 if (inl)
128 DES_cfb64_encrypt(in, out, (long)inl, ctx->cipher_data,
129 (DES_cblock *)ctx->iv, &ctx->num, ctx->encrypt);
130 return 1;
131 }
132
133 /* Although we have a CFB-r implementation for DES, it doesn't pack the right
134 way, so wrap it here */
135 static int des_cfb1_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
136 const unsigned char *in, size_t inl)
137 {
138 size_t n,chunk=EVP_MAXCHUNK/8;
139 unsigned char c[1],d[1];
140
141 if (inl<chunk) chunk=inl;
142
143 while (inl && inl>=chunk)
144 {
145 for(n=0 ; n < chunk*8; ++n)
146 {
147 c[0]=(in[n/8]&(1 << (7-n%8))) ? 0x80 : 0;
148 DES_cfb_encrypt(c,d,1,1,ctx->cipher_data,(DES_cblock *)ctx->iv,
149 ctx->encrypt);
150 out[n/8]=(out[n/8]&~(0x80 >> (unsigned int)(n%8))) |
151 ((d[0]&0x80) >> (unsigned int)(n%8));
152 }
153 inl-=chunk;
154 in +=chunk;
155 out+=chunk;
156 if (inl<chunk) chunk=inl;
157 }
158
159 return 1;
160 }
161
162 static int des_cfb8_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
163 const unsigned char *in, size_t inl)
164 {
165 while (inl>=EVP_MAXCHUNK)
166 {
167 DES_cfb_encrypt(in,out,8,(long)EVP_MAXCHUNK,ctx->cipher_data,
168 (DES_cblock *)ctx->iv,ctx->encrypt);
169 inl-=EVP_MAXCHUNK;
170 in +=EVP_MAXCHUNK;
171 out+=EVP_MAXCHUNK;
172 }
173 if (inl)
174 DES_cfb_encrypt(in,out,8,(long)inl,ctx->cipher_data,
175 (DES_cblock *)ctx->iv,ctx->encrypt);
176 return 1;
177 }
178
179 BLOCK_CIPHER_defs(des, DES_key_schedule, NID_des, 8, 8, 8, 64,
180 EVP_CIPH_RAND_KEY, des_init_key, NULL,
181 EVP_CIPHER_set_asn1_iv,
182 EVP_CIPHER_get_asn1_iv,
183 des_ctrl)
184
185 BLOCK_CIPHER_def_cfb(des,DES_key_schedule,NID_des,8,8,1,
186 EVP_CIPH_RAND_KEY, des_init_key,NULL,
187 EVP_CIPHER_set_asn1_iv,
188 EVP_CIPHER_get_asn1_iv,des_ctrl)
189
190 BLOCK_CIPHER_def_cfb(des,DES_key_schedule,NID_des,8,8,8,
191 EVP_CIPH_RAND_KEY,des_init_key,NULL,
192 EVP_CIPHER_set_asn1_iv,
193 EVP_CIPHER_get_asn1_iv,des_ctrl)
194
195 static 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
208 static int des_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
209 {
210
211 switch(type)
212 {
213 case EVP_CTRL_RAND_KEY:
214 if (RAND_bytes(ptr, 8) <= 0)
215 return 0;
216 DES_set_odd_parity((DES_cblock *)ptr);
217 return 1;
218
219 default:
220 return -1;
221 }
222 }
223
224 #endif