Reduce the scope of the query to reduce FPs

java/ql/test/experimental/query-tests/security/CWE-759/SHA512.java

@@ -0,0 +1,21 @@
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+
+public class SHA512 implements HASH {
+  MessageDigest md;
+  public int getBlockSize() {return 32;}
+  public void init() throws NoSuchAlgorithmException {
+    try { md = MessageDigest.getInstance("SHA-512"); }
+    catch (Exception e){
+      System.err.println(e);
+    }
+  }
+
+  public void update(byte[] foo, int start, int len) throws NoSuchAlgorithmException {
+    md.update(foo, start, len);
+  }
+
+  public byte[] digest() throws NoSuchAlgorithmException {
+    return md.digest();
+  }
+}