1 /* crypto/des/ofb64ede.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 "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  */
des_ede3_ofb64_encrypt(register const unsigned char * in,register unsigned char * out,long length,des_key_schedule k1,des_key_schedule k2,des_key_schedule k3,des_cblock * ivec,int * num)65 void des_ede3_ofb64_encrypt(register const unsigned char *in,
66                register unsigned char *out, long length, des_key_schedule k1,
67                des_key_schedule k2, des_key_schedule k3, des_cblock *ivec,
68                int *num)
69           {
70           register DES_LONG v0,v1;
71           register int n= *num;
72           register long l=length;
73           des_cblock d;
74           register char *dp;
75           DES_LONG ti[2];
76           unsigned char *iv;
77           int save=0;
78 
79           iv = &(*ivec)[0];
80           c2l(iv,v0);
81           c2l(iv,v1);
82           ti[0]=v0;
83           ti[1]=v1;
84           dp=(char *)d;
85           l2c(v0,dp);
86           l2c(v1,dp);
87           while (l--)
88                     {
89                     if (n == 0)
90                               {
91                               /* ti[0]=v0; */
92                               /* ti[1]=v1; */
93                               des_encrypt3(ti,k1,k2,k3);
94                               v0=ti[0];
95                               v1=ti[1];
96 
97                               dp=(char *)d;
98                               l2c(v0,dp);
99                               l2c(v1,dp);
100                               save++;
101                               }
102                     *(out++)= *(in++)^d[n];
103                     n=(n+1)&0x07;
104                     }
105           if (save)
106                     {
107 /*                  v0=ti[0];
108                     v1=ti[1];*/
109                     iv = &(*ivec)[0];
110                     l2c(v0,iv);
111                     l2c(v1,iv);
112                     }
113           v0=v1=ti[0]=ti[1]=0;
114           *num=n;
115           }
116 
117 #ifdef undef /* MACRO */
des_ede2_ofb64_encrypt(register unsigned char * in,register unsigned char * out,long length,des_key_schedule k1,des_key_schedule k2,des_cblock (* ivec),int * num)118 void des_ede2_ofb64_encrypt(register unsigned char *in,
119                register unsigned char *out, long length, des_key_schedule k1,
120                des_key_schedule k2, des_cblock (*ivec), int *num)
121           {
122           des_ede3_ofb64_encrypt(in, out, length, k1,k2,k1, ivec, num);
123           }
124 #endif
125