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devtls: fix hmac buffer size for SHA1 hashes (from erik)

the buffer isn't big enough for SHA1 hashes, which are larger than MD5
hashes.

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

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

@@ -732,7 +732,7 @@

 {

 	OneWay *volatile in;

 	Block *volatile b;

-	uchar *p, seq[8], header[RecHdrLen], hmac[MD5dlen];

+	uchar *p, seq[8], header[RecHdrLen], hmac[MaxMacLen];

 	int volatile nconsumed;

 	int len, type, ver, unpad_len;

@@ -1323,7 +1323,7 @@

 	tr = tlsdevs[CONV(c->qid)];

 	if(tr == nil)

-		panic("tlsbread");

+		panic("tlsbwrite");

 	ty = TYPE(c->qid);

 	switch(ty) {

-- 

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