Make WrongCertificateMessageType work in both 1.3 and 1.2.

In preparation for getting the tests going.

Change-Id: Ifd2ab09e6ce91f99abde759d5db8dc6554521572
Reviewed-on: https://boringssl-review.googlesource.com/8764
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: Steven Valdez <svaldez@google.com>
Reviewed-by: David Benjamin <davidben@google.com>

ssl/test/runner/handshake_server.go

@@ -433,8 +433,12 @@ Curves:
 		if !config.Bugs.EmptyCertificateList {
 			certMsg.certificates = hs.cert.Certificate
 		}
-		hs.writeServerHash(certMsg.marshal())
-		c.writeRecord(recordTypeHandshake, certMsg.marshal())
+		certMsgBytes := certMsg.marshal()
+		if config.Bugs.WrongCertificateMessageType {
+			certMsgBytes[0] += 42
+		}
+		hs.writeServerHash(certMsgBytes)
+		c.writeRecord(recordTypeHandshake, certMsgBytes)
 
 		certVerify := &certificateVerifyMsg{
 			hasSignatureAlgorithm: true,

ssl/test/runner/runner.go

@@ -1679,6 +1679,18 @@ func addBasicTests() {
 		},
 		{
 			name: "WrongMessageType",
+			config: Config{
+				MaxVersion: VersionTLS12,
+				Bugs: ProtocolBugs{
+					WrongCertificateMessageType: true,
+				},
+			},
+			shouldFail:         true,
+			expectedError:      ":UNEXPECTED_MESSAGE:",
+			expectedLocalError: "remote error: unexpected message",
+		},
+		{
+			name: "WrongMessageType-TLS13",
 			config: Config{
 				Bugs: ProtocolBugs{
 					WrongCertificateMessageType: true,