document aes_xts_decrypt, aesCCMdecrypt

Reference: /n/atom/patch/applied/manrefaes
Date: Sun Oct  4 16:53:56 CES 2015
Signed-off-by: quanstro@quanstro.net

--- /sys/man/2/aes	Sun Oct  4 16:53:43 2015
+++ /sys/man/2/aes	Sun Oct  4 16:53:45 2015
@@ -1,6 +1,6 @@
 .TH AES 2
 .SH NAME
-aes_encrypt, aes_decrypt, setupAESstate, aesCBCencrypt, aesCBCdecrypt, aesCTRencrypt, aesCTRdecrypt, setupAESXCBCstate, aesXCBCmac - advanced encryption standard (rijndael)
+aes_encrypt, aes_decrypt, aes_xts_encrypt, aes_xts_decrypt, setupAESstate, aesCBCencrypt, aesCBCdecrypt, aesCCMencrypt, aesCCMdecrypt, aesCTRencrypt, aesCTRdecrypt, setupAESXCBCstate, aesXCBCmac - advanced encryption standard (rijndael)
 .SH SYNOPSIS
 .B #include <u.h>
 .br
@@ -13,10 +13,20 @@
 .in +0.5i
 .ti -0.5i
 .B
-void	aes_encrypt(ulong rk[], int Nr, uchar pt[16], uchar ct[16]);
+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]);
+void	aes_decrypt(ulong rk[], int Nr, uchar ct[16], uchar pt[16])
+.PP
+.B
+void	aes_xts_encrypt(u32int tweak[], u32int ecb[], vlong sec,
+.B
+		uchar *in, uchar *out, usize len)
+.PP
+.B
+void	aes_xts_decrypt(u32int tweak[], u32int ecb[], vlong sec,
+.B
+		uchar *in, uchar *out, usize len)
 .PP
 .B
 void	setupAESstate(AESstate *s, uchar key[], int keybytes, uchar *ivec)
@@ -57,6 +67,10 @@
 .I aesCTRdecrypt
 implement counter mode, per RFC 3686;
 they are identical operations.
+.I AesCCMencrypt
+and
+.I aesCCMdecrypt
+implement 128-bit counter with CBC mac mode for authenticated encryption.
 .I setupAESXCBCstate
 and
 .I aesXCBCmac
@@ -71,6 +85,13 @@
 bytes should be random enough to be unlikely to be reused
 but does not need to be
 cryptographically strongly unpredictable.
+.PP
+.I Aes_xts_encrypt
+and
+.I aes_xts_decrypt
+is a variant implementing implements XTS (Xor-encrypt-xor with
+cypertext stealing) mode,
+commonly used for disk encryption.  
 .SH SOURCE
 .B /sys/src/libsec
 .SH SEE ALSO