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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
       using  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)