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1/* crypto/rc4/rc4_enc.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 <openssl/rc4.h>
60#include "rc4_locl.h"
61
62/* RC4 as implemented from a posting from
63 * Newsgroups: sci.crypt
64 * From: sterndark@netcom.com (David Sterndark)
65 * Subject: RC4 Algorithm revealed.
66 * Message-ID: <sternCvKL4B.Hyy@netcom.com>
67 * Date: Wed, 14 Sep 1994 06:35:31 GMT
68 */
69
70void RC4(RC4_KEY *key, unsigned long len, unsigned char *indata,
71 unsigned char *outdata)
72 {
73 register RC4_INT *d;
74 register RC4_INT x,y,tx,ty;
75 int i;
76
77 x=key->x;
78 y=key->y;
79 d=key->data;
80
81#define LOOP(in,out) \
82 x=((x+1)&0xff); \
83 tx=d[x]; \
84 y=(tx+y)&0xff; \
85 d[x]=ty=d[y]; \
86 d[y]=tx; \
87 (out) = d[(tx+ty)&0xff]^ (in);
88
89#ifndef RC4_INDEX
90#define RC4_LOOP(a,b,i) LOOP(*((a)++),*((b)++))
91#else
92#define RC4_LOOP(a,b,i) LOOP(a[i],b[i])
93#endif
94
95 i=(int)(len>>3L);
96 if (i)
97 {
98 for (;;)
99 {
100 RC4_LOOP(indata,outdata,0);
101 RC4_LOOP(indata,outdata,1);
102 RC4_LOOP(indata,outdata,2);
103 RC4_LOOP(indata,outdata,3);
104 RC4_LOOP(indata,outdata,4);
105 RC4_LOOP(indata,outdata,5);
106 RC4_LOOP(indata,outdata,6);
107 RC4_LOOP(indata,outdata,7);
108#ifdef RC4_INDEX
109 indata+=8;
110 outdata+=8;
111#endif
112 if (--i == 0) break;
113 }
114 }
115 i=(int)len&0x07;
116 if (i)
117 {
118 for (;;)
119 {
120 RC4_LOOP(indata,outdata,0); if (--i == 0) break;
121 RC4_LOOP(indata,outdata,1); if (--i == 0) break;
122 RC4_LOOP(indata,outdata,2); if (--i == 0) break;
123 RC4_LOOP(indata,outdata,3); if (--i == 0) break;
124 RC4_LOOP(indata,outdata,4); if (--i == 0) break;
125 RC4_LOOP(indata,outdata,5); if (--i == 0) break;
126 RC4_LOOP(indata,outdata,6); if (--i == 0) break;
127 }
128 }
129 key->x=x;
130 key->y=y;
131 }
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