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git.ipfire.org Git - thirdparty/openssl.git/blob - crypto/rc4/rc4_enc.c
1 /* crypto/rc4/rc4_enc.org */
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.]
59 /* WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
61 * Always modify rc4_enc.org since rc4_enc.c is automatically generated from
62 * it during SSLeay configuration.
63 * WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
68 /* if this is defined data[i] is used instead of *data, this is a %20
72 char *RC4_version
="RC4 part of SSLeay 0.8.1a 24-Jun-1998";
77 if (sizeof(RC4_INT
) == 1)
78 return("rc4(idx,char)");
80 return("rc4(idx,int)");
82 if (sizeof(RC4_INT
) == 1)
83 return("rc4(ptr,char)");
85 return("rc4(ptr,int)");
89 /* RC4 as implemented from a posting from
90 * Newsgroups: sci.crypt
91 * From: sterndark@netcom.com (David Sterndark)
92 * Subject: RC4 Algorithm revealed.
93 * Message-ID: <sternCvKL4B.Hyy@netcom.com>
94 * Date: Wed, 14 Sep 1994 06:35:31 GMT
97 void RC4_set_key(key
, len
, data
)
100 register unsigned char *data
;
102 register RC4_INT tmp
;
103 register int id1
,id2
;
108 for (i
=0; i
<256; i
++)
114 #define SK_LOOP(n) { \
116 id2 = (data[id1] + tmp + id2) & 0xff; \
117 if (++id1 == len) id1=0; \
121 for (i
=0; i
< 256; i
+=4)
130 void RC4(key
, len
, indata
, outdata
)
133 unsigned char *indata
;
134 unsigned char *outdata
;
137 register RC4_INT x
,y
,tx
,ty
;
144 #define LOOP(in,out) \
150 (out) = d[(tx+ty)&0xff]^ (in);
153 #define RC4_LOOP(a,b,i) LOOP(*((a)++),*((b)++))
155 #define RC4_LOOP(a,b,i) LOOP(a[i],b[i])
164 RC4_LOOP(indata
,outdata
,0);
165 RC4_LOOP(indata
,outdata
,1);
166 RC4_LOOP(indata
,outdata
,2);
167 RC4_LOOP(indata
,outdata
,3);
168 RC4_LOOP(indata
,outdata
,4);
169 RC4_LOOP(indata
,outdata
,5);
170 RC4_LOOP(indata
,outdata
,6);
171 RC4_LOOP(indata
,outdata
,7);
184 RC4_LOOP(indata
,outdata
,0); if (--i
== 0) break;
185 RC4_LOOP(indata
,outdata
,1); if (--i
== 0) break;
186 RC4_LOOP(indata
,outdata
,2); if (--i
== 0) break;
187 RC4_LOOP(indata
,outdata
,3); if (--i
== 0) break;
188 RC4_LOOP(indata
,outdata
,4); if (--i
== 0) break;
189 RC4_LOOP(indata
,outdata
,5); if (--i
== 0) break;
190 RC4_LOOP(indata
,outdata
,6); if (--i
== 0) break;