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 * From: sterndark@netcom.com (David Sterndark)
17 * Subject: RC4 Algorithm revealed.
18 * Message-ID: <sternCvKL4B.Hyy@netcom.com>
19 * Date: Wed, 14 Sep 1994 06:35:31 GMT
22 void RC4(RC4_KEY *key, size_t len, const unsigned char *indata,
23 unsigned char *outdata)
26 register RC4_INT x, y, tx, ty;
33 #define LOOP(in,out) \
39 (out) = d[(tx+ty)&0xff]^ (in);
44 LOOP(indata[0], outdata[0]);
45 LOOP(indata[1], outdata[1]);
46 LOOP(indata[2], outdata[2]);
47 LOOP(indata[3], outdata[3]);
48 LOOP(indata[4], outdata[4]);
49 LOOP(indata[5], outdata[5]);
50 LOOP(indata[6], outdata[6]);
51 LOOP(indata[7], outdata[7]);
61 LOOP(indata[0], outdata[0]);
64 LOOP(indata[1], outdata[1]);
67 LOOP(indata[2], outdata[2]);
70 LOOP(indata[3], outdata[3]);
73 LOOP(indata[4], outdata[4]);
76 LOOP(indata[5], outdata[5]);
79 LOOP(indata[6], outdata[6]);