| 12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455 |
- .TH RC4 2
- .SH NAME
- setupRC4state, rc4, rc4skip, rc4back - alleged rc4 encryption
- .SH SYNOPSIS
- .B #include <u.h>
- .br
- .B #include <libc.h>
- .br
- .B #include <mp.h>
- .br
- .B #include <libsec.h>
- .PP
- .B
- void setupRC4state(RC4state *s, uchar *seed, int slen)
- .PP
- .B
- void rc4(RC4state *s, uchar *data, int dlen)
- .PP
- .B
- void rc4skip(RC4state *s, int nbytes)
- .PP
- .B
- void rc4back(RC4state *s, int nbytes)
- .SH DESCRIPTION
- .PP
- 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
- .IR setupRC4state ,
- can be any length. The generator can be run forward using
- .IR rc4 ,
- skip over bytes using
- .I rc4skip
- to account lost transmissions,
- or run backwards using
- .I rc4back
- to cover retransmitted data.
- The
- .I RC4state
- structure keeps track of the algorithm.
- .SH SOURCE
- .B /sys/src/libsec
- .SH SEE ALSO
- .IR mp (2),
- .IR aes (2),
- .IR blowfish (2),
- .IR des (2),
- .IR dsa (2),
- .IR elgamal (2),
- .IR rsa (2),
- .IR sechash (2),
- .IR prime (2),
- .IR rand (2)
|
