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/des/internal.h"
62
63
64/* The input and output encrypted as though 64bit cfb mode is being used. The
65 * extra state information to record how much of the 64bit block we have used
66 * is contained in *num; */
67void DES_ede3_cfb64_encrypt(const uint8_t *in, uint8_t *out,
68                            long length, DES_key_schedule *ks1,
69                            DES_key_schedule *ks2, DES_key_schedule *ks3,
70                            DES_cblock *ivec, int *num, int enc) {
71  uint32_t v0, v1;
72  long l = length;
73  int n = *num;
74  uint32_t ti[2];
75  uint8_t *iv, c, cc;
76
77  iv = ivec->bytes;
78  if (enc) {
79    while (l--) {
80      if (n == 0) {
81        c2l(iv, v0);
82        c2l(iv, v1);
83
84        ti[0] = v0;
85        ti[1] = v1;
86        DES_encrypt3(ti, ks1, ks2, ks3);
87        v0 = ti[0];
88        v1 = ti[1];
89
90        iv = ivec->bytes;
91        l2c(v0, iv);
92        l2c(v1, iv);
93        iv = ivec->bytes;
94      }
95      c = *(in++) ^ iv[n];
96      *(out++) = c;
97      iv[n] = c;
98      n = (n + 1) & 0x07;
99    }
100  } else {
101    while (l--) {
102      if (n == 0) {
103        c2l(iv, v0);
104        c2l(iv, v1);
105
106        ti[0] = v0;
107        ti[1] = v1;
108        DES_encrypt3(ti, ks1, ks2, ks3);
109        v0 = ti[0];
110        v1 = ti[1];
111
112        iv = ivec->bytes;
113        l2c(v0, iv);
114        l2c(v1, iv);
115        iv = ivec->bytes;
116      }
117      cc = *(in++);
118      c = iv[n];
119      iv[n] = cc;
120      *(out++) = c ^ cc;
121      n = (n + 1) & 0x07;
122    }
123  }
124  v0 = v1 = ti[0] = ti[1] = c = cc = 0;
125  *num = n;
126}
127
128/* This is compatible with the single key CFB-r for DES, even thought that's
129 * not what EVP needs. */
130
131void DES_ede3_cfb_encrypt(const uint8_t *in, uint8_t *out, int numbits,
132                          long length, DES_key_schedule *ks1,
133                          DES_key_schedule *ks2, DES_key_schedule *ks3,
134                          DES_cblock *ivec, int enc) {
135  uint32_t d0, d1, v0, v1;
136  unsigned long l = length, n = ((unsigned int)numbits + 7) / 8;
137  int num = numbits, i;
138  uint32_t ti[2];
139  uint8_t *iv;
140  uint8_t ovec[16];
141
142  if (num > 64) {
143    return;
144  };
145
146  iv = ivec->bytes;
147  c2l(iv, v0);
148  c2l(iv, v1);
149
150  if (enc) {
151    while (l >= n) {
152      l -= n;
153      ti[0] = v0;
154      ti[1] = v1;
155      DES_encrypt3(ti, ks1, ks2, ks3);
156      c2ln(in, d0, d1, n);
157      in += n;
158      d0 ^= ti[0];
159      d1 ^= ti[1];
160      l2cn(d0, d1, out, n);
161      out += n;
162      /* 30-08-94 - eay - changed because l>>32 and l<<32 are bad under
163       * gcc :-( */
164      if (num == 32) {
165        v0 = v1;
166        v1 = d0;
167      } else if (num == 64) {
168        v0 = d0;
169        v1 = d1;
170      } else {
171        iv = &ovec[0];
172        l2c(v0, iv);
173        l2c(v1, iv);
174        l2c(d0, iv);
175        l2c(d1, iv);
176        /* shift ovec left most of the bits... */
177        memmove(ovec, ovec + num / 8, 8 + (num % 8 ? 1 : 0));
178        /* now the remaining bits */
179        if (num % 8 != 0) {
180          for (i = 0; i < 8; ++i) {
181            ovec[i] <<= num % 8;
182            ovec[i] |= ovec[i + 1] >> (8 - num % 8);
183          }
184        }
185        iv = &ovec[0];
186        c2l(iv, v0);
187        c2l(iv, v1);
188      }
189    }
190  } else {
191    while (l >= n) {
192      l -= n;
193      ti[0] = v0;
194      ti[1] = v1;
195      DES_encrypt3(ti, ks1, ks2, ks3);
196      c2ln(in, d0, d1, n);
197      in += n;
198      /* 30-08-94 - eay - changed because l>>32 and l<<32 are bad under
199       * gcc :-( */
200      if (num == 32) {
201        v0 = v1;
202        v1 = d0;
203      } else if (num == 64) {
204        v0 = d0;
205        v1 = d1;
206      } else {
207        iv = &ovec[0];
208        l2c(v0, iv);
209        l2c(v1, iv);
210        l2c(d0, iv);
211        l2c(d1, iv);
212        /* shift ovec left most of the bits... */
213        memmove(ovec, ovec + num / 8, 8 + (num % 8 ? 1 : 0));
214        /* now the remaining bits */
215        if (num % 8 != 0) {
216          for (i = 0; i < 8; ++i) {
217            ovec[i] <<= num % 8;
218            ovec[i] |= ovec[i + 1] >> (8 - num % 8);
219          }
220        }
221        iv = &ovec[0];
222        c2l(iv, v0);
223        c2l(iv, v1);
224      }
225      d0 ^= ti[0];
226      d1 ^= ti[1];
227      l2cn(d0, d1, out, n);
228      out += n;
229    }
230  }
231
232  iv = ivec->bytes;
233  l2c(v0, iv);
234  l2c(v1, iv);
235  v0 = v1 = d0 = d1 = ti[0] = ti[1] = 0;
236}
237