Crypto: Weak asymmetric key gen size fixes and test.

java/ql/test/experimental/query-tests/quantum/examples/WeakOrUnknownAsymmetricKeySize/InsufficientAsymmetricKeySize.java

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+import java.security.*;
+public class InsufficientAsymmetricKeySize{
+    public static void test() throws Exception{
+        KeyPairGenerator keyPairGen1 = KeyPairGenerator.getInstance("RSA");
+        keyPairGen1.initialize(1024); // $Alert[java/quantum/weak-asymmetric-key-gen-size]
+        keyPairGen1.generateKeyPair();
+
+        KeyPairGenerator keyPairGen2 = KeyPairGenerator.getInstance("DSA");
+        keyPairGen2.initialize(1024); // $Alert[java/quantum/weak-asymmetric-key-gen-size]
+        keyPairGen2.generateKeyPair();
+
+        KeyPairGenerator keyPairGen3 = KeyPairGenerator.getInstance("DH");
+        keyPairGen3.initialize(1024); // $Alert[java/quantum/weak-asymmetric-key-gen-size]
+        keyPairGen3.generateKeyPair();
+
+        KeyPairGenerator keyPairGen4 = KeyPairGenerator.getInstance("RSA");
+        keyPairGen4.initialize(2048); // GOOD
+        keyPairGen4.generateKeyPair();
+
+        KeyPairGenerator keyPairGen5 = KeyPairGenerator.getInstance("DSA");
+        keyPairGen5.initialize(2048); // GOOD
+        keyPairGen5.generateKeyPair();
+
+        KeyPairGenerator keyPairGen6 = KeyPairGenerator.getInstance("DH");
+        keyPairGen6.initialize(2048); // GOOD
+        keyPairGen6.generateKeyPair();
+    }
+}

java/ql/test/experimental/query-tests/quantum/examples/WeakOrUnknownAsymmetricKeySize/WeakOrUnknownAsymmetricKeyGenSize.expected

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+a

java/ql/test/experimental/query-tests/quantum/examples/WeakOrUnknownAsymmetricKeySize/WeakOrUnknownAsymmetricKeyGenSize.qlref

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+experimental/quantum/Examples/WeakAsymmetricKeyGenSize.ql