1*0Sstevel@tonic-gate /* crypto/des/cfb64enc.c */
2*0Sstevel@tonic-gate /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3*0Sstevel@tonic-gate * All rights reserved.
4*0Sstevel@tonic-gate *
5*0Sstevel@tonic-gate * This package is an SSL implementation written
6*0Sstevel@tonic-gate * by Eric Young (eay@cryptsoft.com).
7*0Sstevel@tonic-gate * The implementation was written so as to conform with Netscapes SSL.
8*0Sstevel@tonic-gate *
9*0Sstevel@tonic-gate * This library is free for commercial and non-commercial use as long as
10*0Sstevel@tonic-gate * the following conditions are aheared to. The following conditions
11*0Sstevel@tonic-gate * apply to all code found in this distribution, be it the RC4, RSA,
12*0Sstevel@tonic-gate * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13*0Sstevel@tonic-gate * included with this distribution is covered by the same copyright terms
14*0Sstevel@tonic-gate * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15*0Sstevel@tonic-gate *
16*0Sstevel@tonic-gate * Copyright remains Eric Young's, and as such any Copyright notices in
17*0Sstevel@tonic-gate * the code are not to be removed.
18*0Sstevel@tonic-gate * If this package is used in a product, Eric Young should be given attribution
19*0Sstevel@tonic-gate * as the author of the parts of the library used.
20*0Sstevel@tonic-gate * This can be in the form of a textual message at program startup or
21*0Sstevel@tonic-gate * in documentation (online or textual) provided with the package.
22*0Sstevel@tonic-gate *
23*0Sstevel@tonic-gate * Redistribution and use in source and binary forms, with or without
24*0Sstevel@tonic-gate * modification, are permitted provided that the following conditions
25*0Sstevel@tonic-gate * are met:
26*0Sstevel@tonic-gate * 1. Redistributions of source code must retain the copyright
27*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer.
28*0Sstevel@tonic-gate * 2. Redistributions in binary form must reproduce the above copyright
29*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer in the
30*0Sstevel@tonic-gate * documentation and/or other materials provided with the distribution.
31*0Sstevel@tonic-gate * 3. All advertising materials mentioning features or use of this software
32*0Sstevel@tonic-gate * must display the following acknowledgement:
33*0Sstevel@tonic-gate * "This product includes cryptographic software written by
34*0Sstevel@tonic-gate * Eric Young (eay@cryptsoft.com)"
35*0Sstevel@tonic-gate * The word 'cryptographic' can be left out if the rouines from the library
36*0Sstevel@tonic-gate * being used are not cryptographic related :-).
37*0Sstevel@tonic-gate * 4. If you include any Windows specific code (or a derivative thereof) from
38*0Sstevel@tonic-gate * the apps directory (application code) you must include an acknowledgement:
39*0Sstevel@tonic-gate * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40*0Sstevel@tonic-gate *
41*0Sstevel@tonic-gate * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42*0Sstevel@tonic-gate * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43*0Sstevel@tonic-gate * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44*0Sstevel@tonic-gate * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45*0Sstevel@tonic-gate * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46*0Sstevel@tonic-gate * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47*0Sstevel@tonic-gate * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48*0Sstevel@tonic-gate * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49*0Sstevel@tonic-gate * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50*0Sstevel@tonic-gate * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51*0Sstevel@tonic-gate * SUCH DAMAGE.
52*0Sstevel@tonic-gate *
53*0Sstevel@tonic-gate * The licence and distribution terms for any publically available version or
54*0Sstevel@tonic-gate * derivative of this code cannot be changed. i.e. this code cannot simply be
55*0Sstevel@tonic-gate * copied and put under another distribution licence
56*0Sstevel@tonic-gate * [including the GNU Public Licence.]
57*0Sstevel@tonic-gate */
58*0Sstevel@tonic-gate
59*0Sstevel@tonic-gate #include "des_locl.h"
60*0Sstevel@tonic-gate
61*0Sstevel@tonic-gate /* The input and output encrypted as though 64bit cfb mode is being
62*0Sstevel@tonic-gate * used. The extra state information to record how much of the
63*0Sstevel@tonic-gate * 64bit block we have used is contained in *num;
64*0Sstevel@tonic-gate */
65*0Sstevel@tonic-gate
DES_cfb64_encrypt(const unsigned char * in,unsigned char * out,long length,DES_key_schedule * schedule,DES_cblock * ivec,int * num,int enc)66*0Sstevel@tonic-gate void DES_cfb64_encrypt(const unsigned char *in, unsigned char *out,
67*0Sstevel@tonic-gate long length, DES_key_schedule *schedule,
68*0Sstevel@tonic-gate DES_cblock *ivec, int *num, int enc)
69*0Sstevel@tonic-gate {
70*0Sstevel@tonic-gate register DES_LONG v0,v1;
71*0Sstevel@tonic-gate register long l=length;
72*0Sstevel@tonic-gate register int n= *num;
73*0Sstevel@tonic-gate DES_LONG ti[2];
74*0Sstevel@tonic-gate unsigned char *iv,c,cc;
75*0Sstevel@tonic-gate
76*0Sstevel@tonic-gate iv = &(*ivec)[0];
77*0Sstevel@tonic-gate if (enc)
78*0Sstevel@tonic-gate {
79*0Sstevel@tonic-gate while (l--)
80*0Sstevel@tonic-gate {
81*0Sstevel@tonic-gate if (n == 0)
82*0Sstevel@tonic-gate {
83*0Sstevel@tonic-gate c2l(iv,v0); ti[0]=v0;
84*0Sstevel@tonic-gate c2l(iv,v1); ti[1]=v1;
85*0Sstevel@tonic-gate DES_encrypt1(ti,schedule,DES_ENCRYPT);
86*0Sstevel@tonic-gate iv = &(*ivec)[0];
87*0Sstevel@tonic-gate v0=ti[0]; l2c(v0,iv);
88*0Sstevel@tonic-gate v0=ti[1]; l2c(v0,iv);
89*0Sstevel@tonic-gate iv = &(*ivec)[0];
90*0Sstevel@tonic-gate }
91*0Sstevel@tonic-gate c= *(in++)^iv[n];
92*0Sstevel@tonic-gate *(out++)=c;
93*0Sstevel@tonic-gate iv[n]=c;
94*0Sstevel@tonic-gate n=(n+1)&0x07;
95*0Sstevel@tonic-gate }
96*0Sstevel@tonic-gate }
97*0Sstevel@tonic-gate else
98*0Sstevel@tonic-gate {
99*0Sstevel@tonic-gate while (l--)
100*0Sstevel@tonic-gate {
101*0Sstevel@tonic-gate if (n == 0)
102*0Sstevel@tonic-gate {
103*0Sstevel@tonic-gate c2l(iv,v0); ti[0]=v0;
104*0Sstevel@tonic-gate c2l(iv,v1); ti[1]=v1;
105*0Sstevel@tonic-gate DES_encrypt1(ti,schedule,DES_ENCRYPT);
106*0Sstevel@tonic-gate iv = &(*ivec)[0];
107*0Sstevel@tonic-gate v0=ti[0]; l2c(v0,iv);
108*0Sstevel@tonic-gate v0=ti[1]; l2c(v0,iv);
109*0Sstevel@tonic-gate iv = &(*ivec)[0];
110*0Sstevel@tonic-gate }
111*0Sstevel@tonic-gate cc= *(in++);
112*0Sstevel@tonic-gate c=iv[n];
113*0Sstevel@tonic-gate iv[n]=cc;
114*0Sstevel@tonic-gate *(out++)=c^cc;
115*0Sstevel@tonic-gate n=(n+1)&0x07;
116*0Sstevel@tonic-gate }
117*0Sstevel@tonic-gate }
118*0Sstevel@tonic-gate v0=v1=ti[0]=ti[1]=c=cc=0;
119*0Sstevel@tonic-gate *num=n;
120*0Sstevel@tonic-gate }
121*0Sstevel@tonic-gate
122