term% cat index.txt RC4(2) System Calls Manual RC4(2)
NAME
setupRC4state, rc4, rc4skip, rc4back - alleged rc4 encryption
SYNOPSIS
#include <u.h>
#include <libc.h>
#include <mp.h>
#include <libsec.h>
void setupRC4state(RC4state *s, uchar *seed, int slen)
void rc4(RC4state *s, uchar *data, int dlen)
void rc4skip(RC4state *s, int nbytes)
void rc4back(RC4state *s, int nbytes)
DESCRIPTION
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 setupRC4state, can
be any length. The generator can be run forward using rc4, skip over
bytes using rc4skip to account lost transmissions, or run backwards us‐
ing rc4back to cover retransmitted data. The RC4state structure keeps
track of the algorithm.
SOURCE
/sys/src/libsec
SEE ALSO
mp(2), aes(2), blowfish(2), des(2), dsa(2), elgamal(2), rsa(2),
sechash(2), prime(2), rand(2)
RC4(2)