1/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2 * All rights reserved.
3 *
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
7 *
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to.  The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
14 *
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the copyright
26 *    notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 *    notice, this list of conditions and the following disclaimer in the
29 *    documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 *    must display the following acknowledgement:
32 *    "This product includes cryptographic software written by
33 *     Eric Young (eay@cryptsoft.com)"
34 *    The word 'cryptographic' can be left out if the rouines from the library
35 *    being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 *    the apps directory (application code) you must include an acknowledgement:
38 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50 * SUCH DAMAGE.
51 *
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed.  i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.]  */
56
57#include <string.h>
58
59#include <openssl/des.h>
60
61#include "../../crypto/fipsmodule/des/internal.h"
62#include "../../crypto/internal.h"
63
64
65// The input and output encrypted as though 64bit cfb mode is being used. The
66// extra state information to record how much of the 64bit block we have used
67// is contained in *num;
68void DES_ede3_cfb64_encrypt(const uint8_t *in, uint8_t *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) {
72  uint32_t v0, v1;
73  long l = length;
74  int n = *num;
75  uint32_t ti[2];
76  uint8_t *iv, c, cc;
77
78  iv = ivec->bytes;
79  if (enc) {
80    while (l--) {
81      if (n == 0) {
82        c2l(iv, v0);
83        c2l(iv, v1);
84
85        ti[0] = v0;
86        ti[1] = v1;
87        DES_encrypt3(ti, ks1, ks2, ks3);
88        v0 = ti[0];
89        v1 = ti[1];
90
91        iv = ivec->bytes;
92        l2c(v0, iv);
93        l2c(v1, iv);
94        iv = ivec->bytes;
95      }
96      c = *(in++) ^ iv[n];
97      *(out++) = c;
98      iv[n] = c;
99      n = (n + 1) & 0x07;
100    }
101  } else {
102    while (l--) {
103      if (n == 0) {
104        c2l(iv, v0);
105        c2l(iv, v1);
106
107        ti[0] = v0;
108        ti[1] = v1;
109        DES_encrypt3(ti, ks1, ks2, ks3);
110        v0 = ti[0];
111        v1 = ti[1];
112
113        iv = ivec->bytes;
114        l2c(v0, iv);
115        l2c(v1, iv);
116        iv = ivec->bytes;
117      }
118      cc = *(in++);
119      c = iv[n];
120      iv[n] = cc;
121      *(out++) = c ^ cc;
122      n = (n + 1) & 0x07;
123    }
124  }
125  v0 = v1 = ti[0] = ti[1] = c = cc = 0;
126  *num = n;
127}
128
129// This is compatible with the single key CFB-r for DES, even thought that's
130// not what EVP needs.
131
132void DES_ede3_cfb_encrypt(const uint8_t *in, uint8_t *out, int numbits,
133                          long length, DES_key_schedule *ks1,
134                          DES_key_schedule *ks2, DES_key_schedule *ks3,
135                          DES_cblock *ivec, int enc) {
136  uint32_t d0, d1, v0, v1;
137  unsigned long l = length, n = ((unsigned int)numbits + 7) / 8;
138  int num = numbits, i;
139  uint32_t ti[2];
140  uint8_t *iv;
141  uint8_t ovec[16];
142
143  if (num > 64) {
144    return;
145  };
146
147  iv = ivec->bytes;
148  c2l(iv, v0);
149  c2l(iv, v1);
150
151  if (enc) {
152    while (l >= n) {
153      l -= n;
154      ti[0] = v0;
155      ti[1] = v1;
156      DES_encrypt3(ti, ks1, ks2, ks3);
157      c2ln(in, d0, d1, n);
158      in += n;
159      d0 ^= ti[0];
160      d1 ^= ti[1];
161      l2cn(d0, d1, out, n);
162      out += n;
163      // 30-08-94 - eay - changed because l>>32 and l<<32 are bad under
164      // gcc :-(
165      if (num == 32) {
166        v0 = v1;
167        v1 = d0;
168      } else if (num == 64) {
169        v0 = d0;
170        v1 = d1;
171      } else {
172        iv = &ovec[0];
173        l2c(v0, iv);
174        l2c(v1, iv);
175        l2c(d0, iv);
176        l2c(d1, iv);
177        // shift ovec left most of the bits...
178        OPENSSL_memmove(ovec, ovec + num / 8, 8 + (num % 8 ? 1 : 0));
179        // now the remaining bits
180        if (num % 8 != 0) {
181          for (i = 0; i < 8; ++i) {
182            ovec[i] <<= num % 8;
183            ovec[i] |= ovec[i + 1] >> (8 - num % 8);
184          }
185        }
186        iv = &ovec[0];
187        c2l(iv, v0);
188        c2l(iv, v1);
189      }
190    }
191  } else {
192    while (l >= n) {
193      l -= n;
194      ti[0] = v0;
195      ti[1] = v1;
196      DES_encrypt3(ti, ks1, ks2, ks3);
197      c2ln(in, d0, d1, n);
198      in += n;
199      // 30-08-94 - eay - changed because l>>32 and l<<32 are bad under
200      // gcc :-(
201      if (num == 32) {
202        v0 = v1;
203        v1 = d0;
204      } else if (num == 64) {
205        v0 = d0;
206        v1 = d1;
207      } else {
208        iv = &ovec[0];
209        l2c(v0, iv);
210        l2c(v1, iv);
211        l2c(d0, iv);
212        l2c(d1, iv);
213        // shift ovec left most of the bits...
214        OPENSSL_memmove(ovec, ovec + num / 8, 8 + (num % 8 ? 1 : 0));
215        // now the remaining bits
216        if (num % 8 != 0) {
217          for (i = 0; i < 8; ++i) {
218            ovec[i] <<= num % 8;
219            ovec[i] |= ovec[i + 1] >> (8 - num % 8);
220          }
221        }
222        iv = &ovec[0];
223        c2l(iv, v0);
224        c2l(iv, v1);
225      }
226      d0 ^= ti[0];
227      d1 ^= ti[1];
228      l2cn(d0, d1, out, n);
229      out += n;
230    }
231  }
232
233  iv = ivec->bytes;
234  l2c(v0, iv);
235  l2c(v1, iv);
236  v0 = v1 = d0 = d1 = ti[0] = ti[1] = 0;
237}
238