172c33676SMaxim Ag /* $OpenBSD: rc2cfb64.c,v 1.5 2014/10/28 07:35:59 jsg Exp $ */
2f5b1c8a1SJohn Marino /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3f5b1c8a1SJohn Marino * All rights reserved.
4f5b1c8a1SJohn Marino *
5f5b1c8a1SJohn Marino * This package is an SSL implementation written
6f5b1c8a1SJohn Marino * by Eric Young (eay@cryptsoft.com).
7f5b1c8a1SJohn Marino * The implementation was written so as to conform with Netscapes SSL.
8f5b1c8a1SJohn Marino *
9f5b1c8a1SJohn Marino * This library is free for commercial and non-commercial use as long as
10f5b1c8a1SJohn Marino * the following conditions are aheared to. The following conditions
11f5b1c8a1SJohn Marino * apply to all code found in this distribution, be it the RC4, RSA,
12f5b1c8a1SJohn Marino * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13f5b1c8a1SJohn Marino * included with this distribution is covered by the same copyright terms
14f5b1c8a1SJohn Marino * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15f5b1c8a1SJohn Marino *
16f5b1c8a1SJohn Marino * Copyright remains Eric Young's, and as such any Copyright notices in
17f5b1c8a1SJohn Marino * the code are not to be removed.
18f5b1c8a1SJohn Marino * If this package is used in a product, Eric Young should be given attribution
19f5b1c8a1SJohn Marino * as the author of the parts of the library used.
20f5b1c8a1SJohn Marino * This can be in the form of a textual message at program startup or
21f5b1c8a1SJohn Marino * in documentation (online or textual) provided with the package.
22f5b1c8a1SJohn Marino *
23f5b1c8a1SJohn Marino * Redistribution and use in source and binary forms, with or without
24f5b1c8a1SJohn Marino * modification, are permitted provided that the following conditions
25f5b1c8a1SJohn Marino * are met:
26f5b1c8a1SJohn Marino * 1. Redistributions of source code must retain the copyright
27f5b1c8a1SJohn Marino * notice, this list of conditions and the following disclaimer.
28f5b1c8a1SJohn Marino * 2. Redistributions in binary form must reproduce the above copyright
29f5b1c8a1SJohn Marino * notice, this list of conditions and the following disclaimer in the
30f5b1c8a1SJohn Marino * documentation and/or other materials provided with the distribution.
31f5b1c8a1SJohn Marino * 3. All advertising materials mentioning features or use of this software
32f5b1c8a1SJohn Marino * must display the following acknowledgement:
33f5b1c8a1SJohn Marino * "This product includes cryptographic software written by
34f5b1c8a1SJohn Marino * Eric Young (eay@cryptsoft.com)"
35f5b1c8a1SJohn Marino * The word 'cryptographic' can be left out if the rouines from the library
36f5b1c8a1SJohn Marino * being used are not cryptographic related :-).
37f5b1c8a1SJohn Marino * 4. If you include any Windows specific code (or a derivative thereof) from
38f5b1c8a1SJohn Marino * the apps directory (application code) you must include an acknowledgement:
39f5b1c8a1SJohn Marino * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40f5b1c8a1SJohn Marino *
41f5b1c8a1SJohn Marino * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42f5b1c8a1SJohn Marino * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43f5b1c8a1SJohn Marino * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44f5b1c8a1SJohn Marino * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45f5b1c8a1SJohn Marino * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46f5b1c8a1SJohn Marino * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47f5b1c8a1SJohn Marino * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48f5b1c8a1SJohn Marino * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49f5b1c8a1SJohn Marino * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50f5b1c8a1SJohn Marino * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51f5b1c8a1SJohn Marino * SUCH DAMAGE.
52f5b1c8a1SJohn Marino *
53f5b1c8a1SJohn Marino * The licence and distribution terms for any publically available version or
54f5b1c8a1SJohn Marino * derivative of this code cannot be changed. i.e. this code cannot simply be
55f5b1c8a1SJohn Marino * copied and put under another distribution licence
56f5b1c8a1SJohn Marino * [including the GNU Public Licence.]
57f5b1c8a1SJohn Marino */
58f5b1c8a1SJohn Marino
59f5b1c8a1SJohn Marino #include <openssl/rc2.h>
60f5b1c8a1SJohn Marino #include "rc2_locl.h"
61f5b1c8a1SJohn Marino
62f5b1c8a1SJohn Marino /* The input and output encrypted as though 64bit cfb mode is being
63f5b1c8a1SJohn Marino * used. The extra state information to record how much of the
64f5b1c8a1SJohn Marino * 64bit block we have used is contained in *num;
65f5b1c8a1SJohn Marino */
66f5b1c8a1SJohn Marino
RC2_cfb64_encrypt(const unsigned char * in,unsigned char * out,long length,RC2_KEY * schedule,unsigned char * ivec,int * num,int encrypt)67f5b1c8a1SJohn Marino void RC2_cfb64_encrypt(const unsigned char *in, unsigned char *out,
68f5b1c8a1SJohn Marino long length, RC2_KEY *schedule, unsigned char *ivec,
69f5b1c8a1SJohn Marino int *num, int encrypt)
70f5b1c8a1SJohn Marino {
71f5b1c8a1SJohn Marino unsigned long v0,v1,t;
72f5b1c8a1SJohn Marino int n= *num;
73f5b1c8a1SJohn Marino long l=length;
74f5b1c8a1SJohn Marino unsigned long ti[2];
75f5b1c8a1SJohn Marino unsigned char *iv,c,cc;
76f5b1c8a1SJohn Marino
77f5b1c8a1SJohn Marino iv=(unsigned char *)ivec;
78f5b1c8a1SJohn Marino if (encrypt)
79f5b1c8a1SJohn Marino {
80f5b1c8a1SJohn Marino while (l--)
81f5b1c8a1SJohn Marino {
82f5b1c8a1SJohn Marino if (n == 0)
83f5b1c8a1SJohn Marino {
84f5b1c8a1SJohn Marino c2l(iv,v0); ti[0]=v0;
85f5b1c8a1SJohn Marino c2l(iv,v1); ti[1]=v1;
86f5b1c8a1SJohn Marino RC2_encrypt((unsigned long *)ti,schedule);
87f5b1c8a1SJohn Marino iv=(unsigned char *)ivec;
88f5b1c8a1SJohn Marino t=ti[0]; l2c(t,iv);
89f5b1c8a1SJohn Marino t=ti[1]; l2c(t,iv);
90f5b1c8a1SJohn Marino iv=(unsigned char *)ivec;
91f5b1c8a1SJohn Marino }
92f5b1c8a1SJohn Marino c= *(in++)^iv[n];
93f5b1c8a1SJohn Marino *(out++)=c;
94f5b1c8a1SJohn Marino iv[n]=c;
95f5b1c8a1SJohn Marino n=(n+1)&0x07;
96f5b1c8a1SJohn Marino }
97f5b1c8a1SJohn Marino }
98f5b1c8a1SJohn Marino else
99f5b1c8a1SJohn Marino {
100f5b1c8a1SJohn Marino while (l--)
101f5b1c8a1SJohn Marino {
102f5b1c8a1SJohn Marino if (n == 0)
103f5b1c8a1SJohn Marino {
104f5b1c8a1SJohn Marino c2l(iv,v0); ti[0]=v0;
105f5b1c8a1SJohn Marino c2l(iv,v1); ti[1]=v1;
106f5b1c8a1SJohn Marino RC2_encrypt((unsigned long *)ti,schedule);
107f5b1c8a1SJohn Marino iv=(unsigned char *)ivec;
108f5b1c8a1SJohn Marino t=ti[0]; l2c(t,iv);
109f5b1c8a1SJohn Marino t=ti[1]; l2c(t,iv);
110f5b1c8a1SJohn Marino iv=(unsigned char *)ivec;
111f5b1c8a1SJohn Marino }
112f5b1c8a1SJohn Marino cc= *(in++);
113f5b1c8a1SJohn Marino c=iv[n];
114f5b1c8a1SJohn Marino iv[n]=cc;
115f5b1c8a1SJohn Marino *(out++)=c^cc;
116f5b1c8a1SJohn Marino n=(n+1)&0x07;
117f5b1c8a1SJohn Marino }
118f5b1c8a1SJohn Marino }
119f5b1c8a1SJohn Marino v0=v1=ti[0]=ti[1]=t=c=cc=0;
120f5b1c8a1SJohn Marino *num=n;
121f5b1c8a1SJohn Marino }
122f5b1c8a1SJohn Marino
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