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Diffstat (limited to 'static/plan9-4e/man2/rc4.2')
| -rw-r--r-- | static/plan9-4e/man2/rc4.2 | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/static/plan9-4e/man2/rc4.2 b/static/plan9-4e/man2/rc4.2 new file mode 100644 index 00000000..c450c73c --- /dev/null +++ b/static/plan9-4e/man2/rc4.2 @@ -0,0 +1,54 @@ +.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 elgamal (2), +.IR rsa (2), +.IR sechash (2), +.IR prime (2), +.IR rand (2) |