Test for BigIntegerScalarOps.reduce()

Author: str4d

test/net/i2p/crypto/eddsa/math/bigint/BigIntegerScalarOpsTest.java

@@ -0,0 +1,55 @@
+/**
+ * 
+ */
+package net.i2p.crypto.eddsa.math.bigint;
+
+import static org.hamcrest.Matchers.*;
+import static org.junit.Assert.*;
+
+import java.math.BigInteger;
+
+import net.i2p.crypto.eddsa.Utils;
+import net.i2p.crypto.eddsa.math.Field;
+import net.i2p.crypto.eddsa.math.ScalarOps;
+import net.i2p.crypto.eddsa.spec.EdDSANamedCurveSpec;
+import net.i2p.crypto.eddsa.spec.EdDSANamedCurveTable;
+
+import org.junit.Test;
+
+/**
+ * @author str4d
+ *
+ */
+public class BigIntegerScalarOpsTest {
+
+    static final EdDSANamedCurveSpec ed25519 = EdDSANamedCurveTable.getByName("ed25519-sha-512");
+    static final Field ed25519Field = ed25519.getCurve().getField();
+
+    /**
+     * Test method for {@link net.i2p.crypto.eddsa.math.bigint.BigIntegerScalarOps#reduce(byte[])}.
+     */
+    @Test
+    public void testReduce() {
+        ScalarOps sc = new BigIntegerScalarOps(ed25519Field,
+                new BigIntegerFieldElement(ed25519Field,
+                        new BigInteger("5")));
+        assertThat(sc.reduce(new byte[] {7}),
+                is(equalTo(Utils.hexToBytes("0200000000000000000000000000000000000000000000000000000000000000"))));
+
+        ScalarOps sc2 = new BigIntegerScalarOps(ed25519Field,
+                new BigIntegerFieldElement(ed25519Field,
+                        new BigInteger("7237005577332262213973186563042994240857116359379907606001950938285454250989")));
+        // Example from test case 1
+        byte[] r = Utils.hexToBytes("b6b19cd8e0426f5983fa112d89a143aa97dab8bc5deb8d5b6253c928b65272f4044098c2a990039cde5b6a4818df0bfb6e40dc5dee54248032962323e701352d");
+        assertThat(sc2.reduce(r), is(equalTo(Utils.hexToBytes("f38907308c893deaf244787db4af53682249107418afc2edc58f75ac58a07404"))));
+    }
+
+    /**
+     * Test method for {@link net.i2p.crypto.eddsa.math.bigint.BigIntegerScalarOps#multiplyAndAdd(byte[], byte[], byte[])}.
+     */
+    @Test
+    public void testMultiplyAndAdd() {
+        fail("Not yet implemented");
+    }
+
+}