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/*
* Copyright (C) 2011 The Guava Authors
*
* 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.common.hash;
import com.google.common.base.Charsets;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import junit.framework.TestCase;
/**
* Tests for the MessageDigestHashFunction.
*
* @author Kurt Alfred Kluever
*/
public class MessageDigestHashFunctionTest extends TestCase {
private static final ImmutableSet<String> INPUTS = ImmutableSet.of("", "Z", "foobar");
// From "How Provider Implementations Are Requested and Supplied" from
// http://docs.oracle.com/javase/6/docs/technotes/guides/security/crypto/CryptoSpec.html
// - Some providers may choose to also include alias names.
// - For example, the "SHA-1" algorithm might be referred to as "SHA1".
// - The algorithm name is not case-sensitive.
private static final ImmutableMap<String, HashFunction> ALGORITHMS =
new ImmutableMap.Builder<String, HashFunction>()
.put("MD5", Hashing.md5())
.put("SHA", Hashing.sha1()) // Not the official name, but still works
.put("SHA1", Hashing.sha1()) // Not the official name, but still works
.put("sHa-1", Hashing.sha1()) // Not the official name, but still works
.put("SHA-1", Hashing.sha1())
.put("SHA-256", Hashing.sha256())
.put("SHA-384", Hashing.sha384())
.put("SHA-512", Hashing.sha512())
.build();
public void testHashing() {
for (String stringToTest : INPUTS) {
for (String algorithmToTest : ALGORITHMS.keySet()) {
assertMessageDigestHashing(HashTestUtils.ascii(stringToTest), algorithmToTest);
}
}
}
public void testPutAfterHash() {
Hasher sha1 = Hashing.sha1().newHasher();
assertEquals(
"2fd4e1c67a2d28fced849ee1bb76e7391b93eb12",
sha1.putString("The quick brown fox jumps over the lazy dog", Charsets.UTF_8)
.hash()
.toString());
try {
sha1.putInt(42);
fail();
} catch (IllegalStateException expected) {
}
}
public void testHashTwice() {
Hasher sha1 = Hashing.sha1().newHasher();
assertEquals(
"2fd4e1c67a2d28fced849ee1bb76e7391b93eb12",
sha1.putString("The quick brown fox jumps over the lazy dog", Charsets.UTF_8)
.hash()
.toString());
try {
sha1.hash();
fail();
} catch (IllegalStateException expected) {
}
}
public void testToString() {
assertEquals("Hashing.md5()", Hashing.md5().toString());
assertEquals("Hashing.sha1()", Hashing.sha1().toString());
assertEquals("Hashing.sha256()", Hashing.sha256().toString());
assertEquals("Hashing.sha512()", Hashing.sha512().toString());
}
private static void assertMessageDigestHashing(byte[] input, String algorithmName) {
try {
MessageDigest digest = MessageDigest.getInstance(algorithmName);
assertEquals(
HashCode.fromBytes(digest.digest(input)), ALGORITHMS.get(algorithmName).hashBytes(input));
for (int bytes = 4; bytes <= digest.getDigestLength(); bytes++) {
assertEquals(
HashCode.fromBytes(Arrays.copyOf(digest.digest(input), bytes)),
new MessageDigestHashFunction(algorithmName, bytes, algorithmName).hashBytes(input));
}
try {
int maxSize = digest.getDigestLength();
new MessageDigestHashFunction(algorithmName, maxSize + 1, algorithmName);
fail();
} catch (IllegalArgumentException expected) {
}
} catch (NoSuchAlgorithmException nsae) {
throw new AssertionError(nsae);
}
}
}
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