SSL: add support for signature_algorithms extension.

scripts/base/init-bare.bro

@@ -3009,6 +3009,23 @@ export {
 	};
 }
 
+module SSL;
+export {
+	type SignatureAndHashAlgorithm: record {
+		HashAlgorithm: count; ##< Hash algorithm number
+		SignatureAlgorithm: count; ##< Signature algorithm number
+	};
+}
+
+module GLOBAL;
+
+## A vector of Signature and Hash Algorithms.
+##
+## .. todo:: We need this type definition only for declaring builtin functions
+##    via ``bifcl``. We should extend ``bifcl`` to understand composite types
+##    directly and then remove this alias.
+type signature_and_hashalgorithm_vec: vector of SSL::SignatureAndHashAlgorithm;
+
 module X509;
 export {
 	type Certificate: record {

scripts/base/protocols/ssl/consts.bro

@@ -57,6 +57,27 @@ export {
 		[2] = "fatal",
 	} &default=function(i: count):string { return fmt("unknown-%d", i); };
 
+	## Mapping between numeric codes and human readable strings for hash
+	## algorithms.
+	const hash_algorithms: table[count] of string = {
+		[0] = "none",
+		[1] = "md5",
+		[2] = "sha1",
+		[3] = "sha224",
+		[4] = "sha256",
+		[5] = "sha384",
+		[6] = "sha512",
+	} &default=function(i: count):string { return fmt("unknown-%d", i); };
+
+	## Mapping between numeric codes and human readable strings for signature
+	## algorithms.
+	const signature_algorithms: table[count] of string = {
+		[0] = "anonymous",
+		[1] = "rsa",
+		[2] = "dsa",
+		[3] = "ecdsa",
+	} &default=function(i: count):string { return fmt("unknown-%d", i); };
+
 	## Mapping between numeric codes and human readable strings for alert
 	## descriptions.
 	const alert_descriptions: table[count] of string = {