test: remove 512 bits test in test-tls-dhe.js

Test of 512 bits key is failed after upgrading openssl-1.0.1o due to
its limit of 768 bits key size. Remove it and start from 1024 bits
test.

Reviewed-By: Michael Dawson <mdawson@devrus.com>
PR-URL: nodejs/node-v0.x-archive#25533

Author: Shigeki Ohtsu

Diff for: test/fixtures/keys/Makefile

@@ -1,4 +1,4 @@
-all: agent1-cert.pem agent2-cert.pem agent3-cert.pem agent4-cert.pem agent5-cert.pem ca2-crl.pem ec-cert.pem dh512.pem dh1024.pem dh2048.pem
+all: agent1-cert.pem agent2-cert.pem agent3-cert.pem agent4-cert.pem agent5-cert.pem ca2-crl.pem ec-cert.pem dh1024.pem dh2048.pem
 
 
 #
@@ -170,9 +170,6 @@ ec-cert.pem: ec-csr.pem ec-key.pem
 		-signkey ec-key.pem \
 		-out ec-cert.pem
 
-dh512.pem:
-	openssl dhparam -out dh512.pem 512
-
 dh1024.pem:
 	openssl dhparam -out dh1024.pem 1024
 

Diff for: test/fixtures/keys/dh512.pem

@@ -80,11 +80,6 @@ function test(keylen, expectedCipher, cb) {
   });
 }
 
-function test512() {
-  test(512, 'DHE-RSA-AES128-SHA256', test1024);
-  ntests++;
-}
-
 function test1024() {
   test(1024, 'DHE-RSA-AES128-SHA256', test2048);
   ntests++;
@@ -100,7 +95,7 @@ function testError() {
   ntests++;
 }
 
-test512();
+test1024();
 
 process.on('exit', function() {
   assert.equal(ntests, nsuccess);