2005-10-17 jrandom

* Allow an env prop to configure whether we want to use the backwards
      compatible (but not standards compliant) HMAC-MD5, or whether we want
      to use the not-backwards compatible (but standards compliant) one.  No
      one should touch this setting, unless your name is toad or jrandom ;)
    * Added some new dummy facades
    * Be more aggressive on loading up the router.config before building the
      router context
    * Added new hooks for apps to deal with previously undefined I2NP message
      types without having to modify any code.
    * Demo code for using a castrated router for SSU comm (SSUDemo.java)

core/java/src/net/i2p/crypto/HMACSHA256Generator.java

@@ -28,6 +28,7 @@ public class HMACSHA256Generator {
     /** set of available byte[] buffers for verify */
     private List _availableTmp;
     private boolean _useMD5;
+    private int _macSize;
     
     public static final boolean DEFAULT_USE_MD5 = true;
     
@@ -39,6 +40,10 @@ public class HMACSHA256Generator {
             _useMD5 = true;
         else
             _useMD5 = false;
+        if ("true".equals(context.getProperty("i2p.HMACBrokenSize", "true")))
+            _macSize = 32;
+        else
+            _macSize = (_useMD5 ? 16 : 32);
     }
     
     public static HMACSHA256Generator getInstance() {