Adds option to disable custom digest-md5 mechanism.

src/net/java/sip/communicator/impl/protocol/jabber/ProtocolProviderServiceJabberImpl.java

@@ -1247,10 +1247,18 @@ else if (tlsRequired)
 
         // Insert our sasl mechanism implementation
         // in order to support some incompatible servers
-        SASLAuthentication.unregisterSASLMechanism("DIGEST-MD5");
-        SASLAuthentication.registerSASLMechanism("DIGEST-MD5",
-            SASLDigestMD5Mechanism.class);
-        SASLAuthentication.supportSASLMechanism("DIGEST-MD5");
+        boolean disableCustomDigestMD5
+            = accountID.getAccountPropertyBoolean(
+            "DISABLE_CUSTOM_DIGEST_MD5",
+            false);
+
+        if(!disableCustomDigestMD5)
+        {
+            SASLAuthentication.unregisterSASLMechanism("DIGEST-MD5");
+            SASLAuthentication.registerSASLMechanism("DIGEST-MD5",
+                SASLDigestMD5Mechanism.class);
+            SASLAuthentication.supportSASLMechanism("DIGEST-MD5");
+        }
 
         connection.login(userName, password, resource);
 

src/net/java/sip/communicator/impl/protocol/jabber/sasl/SASLDigestMD5Mechanism.java

@@ -99,13 +99,13 @@ public void challengeReceived(String challenge)
             response = sc.evaluateChallenge(null);
         }
 
-		String authenticationText = null;
-		if(null != response) {
-			authenticationText = Base64.encodeBytes(response,Base64.DONT_BREAK_LINES);
-		}
-		if((null == authenticationText) || (authenticationText.equals(""))) {
-			authenticationText = "=";
-		}
+        String authenticationText = null;
+        if(null != response) {
+            authenticationText = Base64.encodeBytes(response,Base64.DONT_BREAK_LINES);
+        }
+        if((null == authenticationText) || (authenticationText.equals(""))) {
+            authenticationText = "=";
+        }
 
         // Send the authentication to the server
         getSASLAuthentication().send(new Response(authenticationText));