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devtls: add support for aes_128_cbc and aes_256_cbc (import from sources)

--- a/sys/src/9/port/devtls.c

+++ b/sys/src/9/port/devtls.c

@@ -234,6 +234,8 @@

 static int	rc4enc(Secret *sec, uchar *buf, int n);

 static int	des3enc(Secret *sec, uchar *buf, int n);

 static int	des3dec(Secret *sec, uchar *buf, int n);

+static int	aesenc(Secret *sec, uchar *buf, int n);

+static int	aesdec(Secret *sec, uchar *buf, int n);

 static int	noenc(Secret *sec, uchar *buf, int n);

 static int	sslunpad(uchar *buf, int n, int block);

 static int	tlsunpad(uchar *buf, int n, int block);

@@ -1428,6 +1430,16 @@

 }

 static void

+initAESkey(Encalg *ea, Secret *s, uchar *p, uchar *iv)

+{

+	s->enckey = smalloc(sizeof(AESstate));

+	s->enc = aesenc;

+	s->dec = aesdec;

+	s->block = 16;

+	setupAESstate(s->enckey, p, ea->keylen, iv);

+}

+

+static void

 initclearenc(Encalg *, Secret *s, uchar *, uchar *)

 {

 	s->enc = noenc;

@@ -1440,6 +1452,8 @@

 	{ "clear", 0, 0, initclearenc },

 	{ "rc4_128", 128/8, 0, initRC4key },

 	{ "3des_ede_cbc", 3 * 8, 8, initDES3key },

+	{ "aes_128_cbc", 128/8, 16, initAESkey },

+	{ "aes_256_cbc", 256/8, 16, initAESkey },

 	{ 0 }

 };

@@ -2015,6 +2029,22 @@

 	des3CBCdecrypt(buf, n, sec->enckey);

 	return (*sec->unpad)(buf, n, 8);

 }

+

+static int

+aesenc(Secret *sec, uchar *buf, int n)

+{

+	n = blockpad(buf, n, 16);

+	aesCBCencrypt(buf, n, sec->enckey);

+	return n;

+}

+

+static int

+aesdec(Secret *sec, uchar *buf, int n)

+{

+	aesCBCdecrypt(buf, n, sec->enckey);

+	return (*sec->unpad)(buf, n, 16);

+}

+

 static DigestState*

 nomac(uchar *, ulong, uchar *, ulong, uchar *, DigestState *)

 {