.TH AES 2
.SH NAME
aes_encrypt, aes_decrypt, setupAESstate, aesCBCencrypt, aesCBCdecrypt, aesCTRencrypt, aesCTRdecrypt, setupAESXCBCstate, aesXCBCmac - advanced encryption standard (rijndael)
.SH SYNOPSIS
.B #include <u.h>
.br
.B #include <libc.h>
.br
.B #include <mp.h>
.br
.B #include <libsec.h>
.PP
.in +0.5i
.ti -0.5i
.B
void	aes_encrypt(ulong rk[], int Nr, uchar pt[16], uchar ct[16]);
.PP
.B
void	aes_decrypt(ulong rk[], int Nr, uchar ct[16], uchar pt[16]);
.PP
.B
void	setupAESstate(AESstate *s, uchar key[], int keybytes, uchar *ivec)
.PP
.B
void	aesCBCencrypt(uchar *p, int len, AESstate *s)
.PP
.B
void	aesCBCdecrypt(uchar *p, int len, AESstate *s)
.PP
.B
void	aesCTRencrypt(uchar *p, int len, AESstate *s)
.PP
.B
void	aesCTRdecrypt(uchar *p, int len, AESstate *s)
.PP
.B
void	setupAESXCBCstate(AESstate *s)
.PP
.B
void	aesXCBCmac(uchar *p, int len, AESstate *s)
.SH DESCRIPTION
AES (a.k.a. Rijndael) has replaced DES as the preferred
block cipher.
.I Aes_encrypt
and
.I aes_decrypt
are the block ciphers, corresponding to
.IR des (2)'s
.IR block_cipher .
.IR SetupAESstate ,
.IR aesCBCencrypt ,
and
.I aesCBCdecrypt
implement cipher-block-chaining encryption.
.I AesCTRencrypt
and
.I aesCTRdecrypt
implement counter mode, per RFC 3686;
they are identical operations.
.I setupAESXCBCstate
and
.I aesXCBCmac
implement AES XCBC message authentication, per RFC 3566.
All ciphering is performed in place.
.I Keybytes
should be 16, 24, or 32.
The initialization vector
.I ivec
of
.I AESbsize
bytes should be random enough to be unlikely to be reused
but does not need to be
cryptographically strongly unpredictable.
.SH SOURCE
.B /sys/src/libsec
.SH SEE ALSO
.I aescbc
in
.IR secstore (1),
.IR mp (2),
.IR blowfish (2),
.IR des (2),
.IR dsa (2),
.IR elgamal (2),
.IR rc4 (2),
.IR rsa (2),
.IR sechash (2),
.IR prime (2),
.IR rand (2)
.br
.B http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf
.SH BUGS
The functions
.IR aes_encrypt ,
.IR aes_decrypt ,
.IR aesCTRencrypt ,
.IR aesCTRdecrypt ,
.IR setupAESXCBCstate ,
and
.IR aesXCBCmac
have not yet been verified by running test vectors through them.