Permit null ciphers.

CHANGES

@@ -5,6 +5,12 @@
 
  Changes between 0.9.1c and 0.9.2
 
+  *) Permit null encryption ciphersuites, used for authentication only. It used
+     to be necessary to set the preprocessor define SSL_ALLOW_ENULL to do this.
+     It is now necessary to set SSL_FORBID_ENULL to prevent the use of null
+     encryption.
+     [Ben Laurie]
+
   *) Add a bunch of fixes to the PKCS#7 stuff. It used to sometimes reorder
      signed attributes when verifying signatures (this would break them), 
      the detached data encoding was wrong and public keys obtained using

ssl/ssl_ciph.c

@@ -353,7 +353,7 @@ char *str;
 	mask|=SSL_kDHr|SSL_kDHd|SSL_kEDH|SSL_aDH;
 #endif
 
-#ifndef SSL_ALLOW_ENULL
+#ifdef SSL_FORBID_ENULL
 	mask|=SSL_eNULL;
 #endif