1 /* crypto/rc2/rc2_ecb.c */
2 /* Copyright (C) 1995-1997 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
62 char *RC2_version="RC2 part of SSLeay 0.8.1b 29-Jun-1998";
64 /* RC2 as implemented frm a posting from
65 * Newsgroups: sci.crypt
66 * Sender: pgut01@cs.auckland.ac.nz (Peter Gutmann)
67 * Subject: Specification for Ron Rivests Cipher No.2
68 * Message-ID: <4fk39f$f70@net.auckland.ac.nz>
69 * Date: 11 Feb 1996 06:45:03 GMT
72 void RC2_ecb_encrypt(in, out, ks, encrypt)
82 RC2_encrypt(d,ks,encrypt);
88 void RC2_encrypt(d,key,encrypt)
94 register RC2_INT *p0,*p1;
95 register RC2_INT x0,x1,x2,x3,t;
100 x1=(RC2_INT)(l>>16L);
102 x2=(RC2_INT)l&0xffff;
103 x3=(RC2_INT)(l>>16L);
109 p0=p1= &(key->data[0]);
112 t=(x0+(x1& ~x3)+(x2&x3)+ *(p0++))&0xffff;
114 t=(x1+(x2& ~x0)+(x3&x0)+ *(p0++))&0xffff;
116 t=(x2+(x3& ~x1)+(x0&x1)+ *(p0++))&0xffff;
118 t=(x3+(x0& ~x2)+(x1&x2)+ *(p0++))&0xffff;
135 p0= &(key->data[63]);
139 t=((x3<<11)|(x3>>5))&0xffff;
140 x3=(t-(x0& ~x2)-(x1&x2)- *(p0--))&0xffff;
141 t=((x2<<13)|(x2>>3))&0xffff;
142 x2=(t-(x3& ~x1)-(x0&x1)- *(p0--))&0xffff;
143 t=((x1<<14)|(x1>>2))&0xffff;
144 x1=(t-(x2& ~x0)-(x3&x0)- *(p0--))&0xffff;
145 t=((x0<<15)|(x0>>1))&0xffff;
146 x0=(t-(x1& ~x3)-(x2&x3)- *(p0--))&0xffff;
153 x3=(x3-p1[x2&0x3f])&0xffff;
154 x2=(x2-p1[x1&0x3f])&0xffff;
155 x1=(x1-p1[x0&0x3f])&0xffff;
156 x0=(x0-p1[x3&0x3f])&0xffff;
161 d[0]=(unsigned long)(x0&0xffff)|((unsigned long)(x1&0xffff)<<16L);
162 d[1]=(unsigned long)(x2&0xffff)|((unsigned long)(x3&0xffff)<<16L);