added specific test for null pubExp in private CRT key.

Author: dghgit

core/src/test/java/org/bouncycastle/crypto/test/RSABlindedTest.java

@@ -1,5 +1,8 @@
 package org.bouncycastle.crypto.test;
 
+import java.math.BigInteger;
+import java.security.SecureRandom;
+
 import org.bouncycastle.crypto.AsymmetricBlockCipher;
 import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
 import org.bouncycastle.crypto.InvalidCipherTextException;
@@ -13,9 +16,6 @@
 import org.bouncycastle.util.encoders.Hex;
 import org.bouncycastle.util.test.SimpleTest;
 
-import java.math.BigInteger;
-import java.security.SecureRandom;
-
 public class RSABlindedTest
     extends SimpleTest
 {
@@ -426,6 +426,15 @@ public void performTest()
         {
             // expected
         }
+
+        // null public exponent
+        privParameters = new RSAPrivateCrtKeyParameters(mod, null, privExp, p, q, pExp, qExp, crtCoef);
+
+        RSABlindedEngine bEng = new RSABlindedEngine();
+
+        bEng.init(true, privParameters);
+
+        bEng.processBlock(new byte[]{ 1 }, 0, 1);
     }