| // Copyright 2017 Google Inc. |
| // |
| // 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.google.crypto.tink.mac.internal; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertThrows; |
| |
| import com.google.crypto.tink.subtle.Hex; |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| import org.junit.runners.JUnit4; |
| |
| /** Tests for AesUtil */ |
| @RunWith(JUnit4.class) |
| public class AesUtilTest { |
| |
| // Some test arrays for the XOR operations. |
| static final byte[] EMPTY = {}; |
| static final byte[] ONE_ONE = {1}; |
| |
| @Test |
| public void padBasicTest() { |
| byte[] r = AesUtil.cmacPad(EMPTY); |
| assertEquals((byte) 0x80, r[0]); |
| assertEquals((byte) 0x00, r[1]); |
| assertEquals((byte) 0x00, r[15]); |
| assertEquals(16, r.length); |
| |
| r = AesUtil.cmacPad(ONE_ONE); |
| assertEquals((byte) 0x01, r[0]); |
| assertEquals((byte) 0x80, r[1]); |
| assertEquals((byte) 0x00, r[2]); |
| assertEquals((byte) 0x00, r[15]); |
| assertEquals(16, r.length); |
| } |
| |
| @Test |
| public void padTooLongTest() { |
| assertThrows(IllegalArgumentException.class, () -> AesUtil.cmacPad(new byte[16])); |
| } |
| |
| @Test |
| public void dblTestVectors() { |
| // Extracted from the SIV test vectors at https://tools.ietf.org/html/rfc5297#section-2.3 |
| // (all the double() steps in Appendix A) |
| String[] testVectorInputs = { |
| "0e04dfafc1efbf040140582859bf073a", |
| "edf09de876c642ee4d78bce4ceedfc4f", |
| "c8b43b5974960e7ce6a5dd85231e591a", |
| "adf31e285d3d1e1d4ddefc1e5bec63e9", |
| "826aa75b5e568eed3125bfb266c61d4e", |
| }; |
| String[] testVectorOutputs = { |
| "1c09bf5f83df7e080280b050b37e0e74", |
| "dbe13bd0ed8c85dc9af179c99ddbf819", |
| "916876b2e92c1cf9cd4bbb0a463cb2b3", |
| "5be63c50ba7a3c3a9bbdf83cb7d8c755", |
| "04d54eb6bcad1dda624b7f64cd8c3a1b", |
| }; |
| |
| byte[] r; |
| for (int i = 0; i < testVectorInputs.length; i++) { |
| r = AesUtil.dbl(Hex.decode(testVectorInputs[i])); |
| assertEquals(testVectorOutputs[i], Hex.encode(r)); |
| } |
| } |
| } |