2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 #include <openssl/rc4.h>
14 * RC4 as implemented from a posting from
15 * Newsgroups: sci.crypt
16 * Subject: RC4 Algorithm revealed.
17 * Message-ID: <sternCvKL4B.Hyy@netcom.com>
18 * Date: Wed, 14 Sep 1994 06:35:31 GMT
21 void RC4(RC4_KEY *key, size_t len, const unsigned char *indata,
22 unsigned char *outdata)
25 register RC4_INT x, y, tx, ty;
32 #define LOOP(in,out) \
38 (out) = d[(tx+ty)&0xff]^ (in);
43 LOOP(indata[0], outdata[0]);
44 LOOP(indata[1], outdata[1]);
45 LOOP(indata[2], outdata[2]);
46 LOOP(indata[3], outdata[3]);
47 LOOP(indata[4], outdata[4]);
48 LOOP(indata[5], outdata[5]);
49 LOOP(indata[6], outdata[6]);
50 LOOP(indata[7], outdata[7]);
60 LOOP(indata[0], outdata[0]);
63 LOOP(indata[1], outdata[1]);
66 LOOP(indata[2], outdata[2]);
69 LOOP(indata[3], outdata[3]);
72 LOOP(indata[4], outdata[4]);
75 LOOP(indata[5], outdata[5]);
78 LOOP(indata[6], outdata[6]);