1 files changed, 49 insertions, 0 deletions
diff --git a/tests/iketests/src/java/com/android/ike/ikev2/utils/BigIntegerUtilsTest.java b/tests/iketests/src/java/com/android/ike/ikev2/utils/BigIntegerUtilsTest.java
new file mode 100644
index 00000000..e3d06ce7
--- /dev/null
+++ b/tests/iketests/src/java/com/android/ike/ikev2/utils/BigIntegerUtilsTest.java
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.ike.ikev2.utils;
+
+import static org.junit.Assert.assertArrayEquals;
+
+import org.junit.Test;
+
+import java.math.BigInteger;
+
+public final class BigIntegerUtilsTest {
+    private static final String TEST_BIGINTEGER_A = "3FFF";
+    private static final String TEST_BIGINTEGER_B = "FFFF";
+    private static final byte[] EXPECTED_BYTE_ARRAY_A_2 = {(byte) 0x3F, (byte) 0xFF};
+    private static final byte[] EXPECTED_BYTE_ARRAY_B_2 = {(byte) 0xFF, (byte) 0xFF};
+    private static final byte[] EXPECTED_BYTE_ARRAY_A_3 = {0, (byte) 0x3F, (byte) 0xFF};
+    private static final byte[] EXPECTED_BYTE_ARRAY_B_3 = {0, (byte) 0xFF, (byte) 0xFF};
+
+    @Test
+    public void testBigIntegerToUnsignedByteArray() throws Exception {
+        BigInteger bigIntA = new BigInteger(TEST_BIGINTEGER_A, 16);
+        BigInteger bigIntB = new BigInteger(TEST_BIGINTEGER_B, 16);
+
+        byte[] byteArrayA2 = BigIntegerUtils.bigIntegerToUnsignedByteArray(bigIntA, 2);
+        assertArrayEquals(EXPECTED_BYTE_ARRAY_A_2, byteArrayA2);
+        byte[] byteArrayB2 = BigIntegerUtils.bigIntegerToUnsignedByteArray(bigIntB, 2);
+        assertArrayEquals(EXPECTED_BYTE_ARRAY_B_2, byteArrayB2);
+
+        byte[] byteArrayA3 = BigIntegerUtils.bigIntegerToUnsignedByteArray(bigIntA, 3);
+
+        assertArrayEquals(EXPECTED_BYTE_ARRAY_A_3, byteArrayA3);
+        byte[] byteArrayB3 = BigIntegerUtils.bigIntegerToUnsignedByteArray(bigIntB, 3);
+        assertArrayEquals(EXPECTED_BYTE_ARRAY_B_3, byteArrayB3);
+    }
+}