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authorryker <>1998-10-05 20:13:14 +0000
committerryker <>1998-10-05 20:13:14 +0000
commitaeeae06a79815dc190061534d47236cec09f9e32 (patch)
tree851692b9c2f9c04f077666855641900f19fdb217 /src/lib/libcrypto/rc4/rc4_enc.c
parenta4f79641824cbf9f60ca9d1168d1fcc46717a82a (diff)
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Import of SSLeay-0.9.0b with RSA and IDEA stubbed + OpenBSD build
functionality for shared libs. Note that routines such as sslv2_init and friends that use RSA will not work due to lack of RSA in this library. Needs documentation and help from ports for easy upgrade to full functionality where legally possible.
Diffstat (limited to 'src/lib/libcrypto/rc4/rc4_enc.c')
-rw-r--r--src/lib/libcrypto/rc4/rc4_enc.c135
1 files changed, 135 insertions, 0 deletions
diff --git a/src/lib/libcrypto/rc4/rc4_enc.c b/src/lib/libcrypto/rc4/rc4_enc.c
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+++ b/src/lib/libcrypto/rc4/rc4_enc.c
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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 "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(key, len, indata, outdata)
71RC4_KEY *key;
72unsigned long len;
73unsigned char *indata;
74unsigned char *outdata;
75 {
76 register RC4_INT *d;
77 register RC4_INT x,y,tx,ty;
78 int i;
79
80 x=key->x;
81 y=key->y;
82 d=key->data;
83
84#define LOOP(in,out) \
85 x=((x+1)&0xff); \
86 tx=d[x]; \
87 y=(tx+y)&0xff; \
88 d[x]=ty=d[y]; \
89 d[y]=tx; \
90 (out) = d[(tx+ty)&0xff]^ (in);
91
92#ifndef RC4_INDEX
93#define RC4_LOOP(a,b,i) LOOP(*((a)++),*((b)++))
94#else
95#define RC4_LOOP(a,b,i) LOOP(a[i],b[i])
96#endif
97
98 i= -(int)len;
99 i=(int)(len>>3L);
100 if (i)
101 {
102 for (;;)
103 {
104 RC4_LOOP(indata,outdata,0);
105 RC4_LOOP(indata,outdata,1);
106 RC4_LOOP(indata,outdata,2);
107 RC4_LOOP(indata,outdata,3);
108 RC4_LOOP(indata,outdata,4);
109 RC4_LOOP(indata,outdata,5);
110 RC4_LOOP(indata,outdata,6);
111 RC4_LOOP(indata,outdata,7);
112#ifdef RC4_INDEX
113 indata+=8;
114 outdata+=8;
115#endif
116 if (--i == 0) break;
117 }
118 }
119 i=(int)len&0x07;
120 if (i)
121 {
122 for (;;)
123 {
124 RC4_LOOP(indata,outdata,0); if (--i == 0) break;
125 RC4_LOOP(indata,outdata,1); if (--i == 0) break;
126 RC4_LOOP(indata,outdata,2); if (--i == 0) break;
127 RC4_LOOP(indata,outdata,3); if (--i == 0) break;
128 RC4_LOOP(indata,outdata,4); if (--i == 0) break;
129 RC4_LOOP(indata,outdata,5); if (--i == 0) break;
130 RC4_LOOP(indata,outdata,6); if (--i == 0) break;
131 }
132 }
133 key->x=x;
134 key->y=y;
135 }