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ofb64ede.c
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1 /* crypto/des/ofb64ede.c */
2 /* Copyright (C) 1995-1998 Eric Young ([email protected])
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young ([email protected]).
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 ([email protected]).
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 ([email protected])"
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 ([email protected])"
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 "des_locl.h"
60 
61 /* The input and output encrypted as though 64bit ofb mode is being
62  * used. The extra state information to record how much of the
63  * 64bit block we have used is contained in *num;
64  */
65 void DES_ede3_ofb64_encrypt(register const unsigned char *in,
66  register unsigned char *out, long length,
68  DES_key_schedule *k3, DES_cblock *ivec,
69  int *num)
70  {
71  register DES_LONG v0,v1;
72  register int n= *num;
73  register long l=length;
74  DES_cblock d;
75  register char *dp;
76  DES_LONG ti[2];
77  unsigned char *iv;
78  int save=0;
79 
80  iv = &(*ivec)[0];
81  c2l(iv,v0);
82  c2l(iv,v1);
83  ti[0]=v0;
84  ti[1]=v1;
85  dp=(char *)d;
86  l2c(v0,dp);
87  l2c(v1,dp);
88  while (l--)
89  {
90  if (n == 0)
91  {
92  /* ti[0]=v0; */
93  /* ti[1]=v1; */
94  DES_encrypt3(ti,k1,k2,k3);
95  v0=ti[0];
96  v1=ti[1];
97 
98  dp=(char *)d;
99  l2c(v0,dp);
100  l2c(v1,dp);
101  save++;
102  }
103  *(out++)= *(in++)^d[n];
104  n=(n+1)&0x07;
105  }
106  if (save)
107  {
108 /* v0=ti[0];
109  v1=ti[1];*/
110  iv = &(*ivec)[0];
111  l2c(v0,iv);
112  l2c(v1,iv);
113  }
114  v0=v1=ti[0]=ti[1]=0;
115  *num=n;
116  }
117 
118 #ifdef undef /* MACRO */
119 void DES_ede2_ofb64_encrypt(register unsigned char *in,
120  register unsigned char *out, long length, DES_key_schedule k1,
121  DES_key_schedule k2, DES_cblock (*ivec), int *num)
122  {
123  DES_ede3_ofb64_encrypt(in, out, length, k1,k2,k1, ivec, num);
124  }
125 #endif