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<title>rc4(3) - Plan 9 from User Space</title>
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<tr><td width=20><td><b>RC4(3)</b><td align=right><b>RC4(3)</b>
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<p><font size=+1><b>NAME </b></font><br>
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setupRC4state, rc4, rc4skip, rc4back - alleged rc4 encryption<br>
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<p><font size=+1><b>SYNOPSIS </b></font><br>
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<tt><font size=+1>#include <u.h><br>
#include <libc.h><br>
#include <mp.h><br>
#include <libsec.h>
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<tt><font size=+1>void setupRC4state(RC4state *s, uchar *seed, int slen)
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<tt><font size=+1>void rc4(RC4state *s, uchar *data, int dlen)
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<tt><font size=+1>void rc4skip(RC4state *s, int nbytes)
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<tt><font size=+1>void rc4back(RC4state *s, int nbytes)<br>
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<p><font size=+1><b>DESCRIPTION </b></font><br>
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This is an algorithm alleged to be Rivest’s RC4 encryption function.
It is a pseudo-random number generator with a 256 byte state and
a long cycle. The input buffer is XOR’d with the output of the
generator both to encrypt and to decrypt. The seed, entered using
<i>setupRC4state</i>, can be any length. The generator can
be run forward using <i>rc4</i>, skip over bytes using <i>rc4skip</i> to account
lost transmissions, or run backwards using <i>rc4back</i> to cover retransmitted
data. The <i>RC4state</i> structure keeps track of the algorithm.<br>
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<p><font size=+1><b>SOURCE </b></font><br>
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<tt><font size=+1>/usr/local/plan9/src/libsec<br>
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<p><font size=+1><b>SEE ALSO </b></font><br>
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<a href="../man3/mp.html"><i>mp</i>(3)</a>, <a href="../man3/aes.html"><i>aes</i>(3)</a>, <a href="../man3/blowfish.html"><i>blowfish</i>(3)</a>, <a href="../man3/des.html"><i>des</i>(3)</a>, <a href="../man3/dsa.html"><i>dsa</i>(3)</a>, <a href="../man3/elgamal.html"><i>elgamal</i>(3)</a>, <a href="../man3/rsa.html"><i>rsa</i>(3)</a>,
<a href="../man3/sechash.html"><i>sechash</i>(3)</a>, <a href="../man3/prime.html"><i>prime</i>(3)</a>, <a href="../man3/rand.html"><i>rand</i>(3)</a><br>
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