1*c9496f6bSchristos /* crypto/des/ofb64enc.c */
2*c9496f6bSchristos /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3*c9496f6bSchristos * All rights reserved.
4*c9496f6bSchristos *
5*c9496f6bSchristos * This package is an SSL implementation written
6*c9496f6bSchristos * by Eric Young (eay@cryptsoft.com).
7*c9496f6bSchristos * The implementation was written so as to conform with Netscapes SSL.
8*c9496f6bSchristos *
9*c9496f6bSchristos * This library is free for commercial and non-commercial use as long as
10*c9496f6bSchristos * the following conditions are aheared to. The following conditions
11*c9496f6bSchristos * apply to all code found in this distribution, be it the RC4, RSA,
12*c9496f6bSchristos * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13*c9496f6bSchristos * included with this distribution is covered by the same copyright terms
14*c9496f6bSchristos * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15*c9496f6bSchristos *
16*c9496f6bSchristos * Copyright remains Eric Young's, and as such any Copyright notices in
17*c9496f6bSchristos * the code are not to be removed.
18*c9496f6bSchristos * If this package is used in a product, Eric Young should be given attribution
19*c9496f6bSchristos * as the author of the parts of the library used.
20*c9496f6bSchristos * This can be in the form of a textual message at program startup or
21*c9496f6bSchristos * in documentation (online or textual) provided with the package.
22*c9496f6bSchristos *
23*c9496f6bSchristos * Redistribution and use in source and binary forms, with or without
24*c9496f6bSchristos * modification, are permitted provided that the following conditions
25*c9496f6bSchristos * are met:
26*c9496f6bSchristos * 1. Redistributions of source code must retain the copyright
27*c9496f6bSchristos * notice, this list of conditions and the following disclaimer.
28*c9496f6bSchristos * 2. Redistributions in binary form must reproduce the above copyright
29*c9496f6bSchristos * notice, this list of conditions and the following disclaimer in the
30*c9496f6bSchristos * documentation and/or other materials provided with the distribution.
31*c9496f6bSchristos * 3. All advertising materials mentioning features or use of this software
32*c9496f6bSchristos * must display the following acknowledgement:
33*c9496f6bSchristos * "This product includes cryptographic software written by
34*c9496f6bSchristos * Eric Young (eay@cryptsoft.com)"
35*c9496f6bSchristos * The word 'cryptographic' can be left out if the rouines from the library
36*c9496f6bSchristos * being used are not cryptographic related :-).
37*c9496f6bSchristos * 4. If you include any Windows specific code (or a derivative thereof) from
38*c9496f6bSchristos * the apps directory (application code) you must include an acknowledgement:
39*c9496f6bSchristos * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40*c9496f6bSchristos *
41*c9496f6bSchristos * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42*c9496f6bSchristos * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43*c9496f6bSchristos * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44*c9496f6bSchristos * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45*c9496f6bSchristos * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46*c9496f6bSchristos * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47*c9496f6bSchristos * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48*c9496f6bSchristos * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49*c9496f6bSchristos * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50*c9496f6bSchristos * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51*c9496f6bSchristos * SUCH DAMAGE.
52*c9496f6bSchristos *
53*c9496f6bSchristos * The licence and distribution terms for any publically available version or
54*c9496f6bSchristos * derivative of this code cannot be changed. i.e. this code cannot simply be
55*c9496f6bSchristos * copied and put under another distribution licence
56*c9496f6bSchristos * [including the GNU Public Licence.]
57*c9496f6bSchristos */
58*c9496f6bSchristos
59*c9496f6bSchristos #include "des_locl.h"
60*c9496f6bSchristos
61*c9496f6bSchristos /* The input and output encrypted as though 64bit ofb mode is being
62*c9496f6bSchristos * used. The extra state information to record how much of the
63*c9496f6bSchristos * 64bit block we have used is contained in *num;
64*c9496f6bSchristos */
des_ofb64_encrypt(register const unsigned char * in,register unsigned char * out,long length,des_key_schedule schedule,des_cblock * ivec,int * num)65*c9496f6bSchristos void des_ofb64_encrypt(register const unsigned char *in,
66*c9496f6bSchristos register unsigned char *out, long length, des_key_schedule schedule,
67*c9496f6bSchristos des_cblock *ivec, int *num)
68*c9496f6bSchristos {
69*c9496f6bSchristos register DES_LONG v0,v1,t;
70*c9496f6bSchristos register int n= *num;
71*c9496f6bSchristos register long l=length;
72*c9496f6bSchristos des_cblock d;
73*c9496f6bSchristos register unsigned char *dp;
74*c9496f6bSchristos DES_LONG ti[2];
75*c9496f6bSchristos unsigned char *iv;
76*c9496f6bSchristos int save=0;
77*c9496f6bSchristos
78*c9496f6bSchristos iv = &(*ivec)[0];
79*c9496f6bSchristos c2l(iv,v0);
80*c9496f6bSchristos c2l(iv,v1);
81*c9496f6bSchristos ti[0]=v0;
82*c9496f6bSchristos ti[1]=v1;
83*c9496f6bSchristos dp=d;
84*c9496f6bSchristos l2c(v0,dp);
85*c9496f6bSchristos l2c(v1,dp);
86*c9496f6bSchristos while (l--)
87*c9496f6bSchristos {
88*c9496f6bSchristos if (n == 0)
89*c9496f6bSchristos {
90*c9496f6bSchristos des_encrypt1(ti,schedule,DES_ENCRYPT);
91*c9496f6bSchristos dp=d;
92*c9496f6bSchristos t=ti[0]; l2c(t,dp);
93*c9496f6bSchristos t=ti[1]; l2c(t,dp);
94*c9496f6bSchristos save++;
95*c9496f6bSchristos }
96*c9496f6bSchristos *(out++)= *(in++)^d[n];
97*c9496f6bSchristos n=(n+1)&0x07;
98*c9496f6bSchristos }
99*c9496f6bSchristos if (save)
100*c9496f6bSchristos {
101*c9496f6bSchristos v0=ti[0];
102*c9496f6bSchristos v1=ti[1];
103*c9496f6bSchristos iv = &(*ivec)[0];
104*c9496f6bSchristos l2c(v0,iv);
105*c9496f6bSchristos l2c(v1,iv);
106*c9496f6bSchristos }
107*c9496f6bSchristos t=v0=v1=ti[0]=ti[1]=0;
108*c9496f6bSchristos *num=n;
109*c9496f6bSchristos }
110*c9496f6bSchristos
111