1 /* crypto/des/cfb64ede.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
63 * The input and output encrypted as though 64bit cfb mode is being used.
64 * The extra state information to record how much of the 64bit block we have
65 * used is contained in *num;
68 void DES_ede3_cfb64_encrypt(const unsigned char *in, unsigned char *out,
69 long length, DES_key_schedule *ks1,
70 DES_key_schedule *ks2, DES_key_schedule *ks3,
71 DES_cblock *ivec, int *num, int enc)
73 register DES_LONG v0, v1;
74 register long l = length;
75 register int n = *num;
77 unsigned char *iv, c, cc;
88 DES_encrypt3(ti, ks1, ks2, ks3);
110 DES_encrypt3(ti, ks1, ks2, ks3);
126 v0 = v1 = ti[0] = ti[1] = c = cc = 0;
131 * This is compatible with the single key CFB-r for DES, even thought that's
132 * not what EVP needs.
135 void DES_ede3_cfb_encrypt(const unsigned char *in, unsigned char *out,
136 int numbits, long length, DES_key_schedule *ks1,
137 DES_key_schedule *ks2, DES_key_schedule *ks3,
138 DES_cblock *ivec, int enc)
140 register DES_LONG d0, d1, v0, v1;
141 register unsigned long l = length, n = ((unsigned int)numbits + 7) / 8;
142 register int num = numbits, i;
145 unsigned char ovec[16];
157 DES_encrypt3(ti, ks1, ks2, ks3);
162 l2cn(d0, d1, out, n);
165 * 30-08-94 - eay - changed because l>>32 and l<<32 are bad under
171 } else if (num == 64) {
180 /* shift ovec left most of the bits... */
181 memmove(ovec, ovec + num / 8, 8 + (num % 8 ? 1 : 0));
182 /* now the remaining bits */
184 for (i = 0; i < 8; ++i) {
186 ovec[i] |= ovec[i + 1] >> (8 - num % 8);
198 DES_encrypt3(ti, ks1, ks2, ks3);
202 * 30-08-94 - eay - changed because l>>32 and l<<32 are bad under
208 } else if (num == 64) {
217 /* shift ovec left most of the bits... */
218 memmove(ovec, ovec + num / 8, 8 + (num % 8 ? 1 : 0));
219 /* now the remaining bits */
221 for (i = 0; i < 8; ++i) {
223 ovec[i] |= ovec[i + 1] >> (8 - num % 8);
231 l2cn(d0, d1, out, n);
238 v0 = v1 = d0 = d1 = ti[0] = ti[1] = 0;