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package com.oracle.truffle.api.test.source;
import java.lang.reflect.Method;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.util.Random;
import org.junit.Assert;
import org.junit.Test;
import com.oracle.truffle.api.test.ReflectionUtils;
public class ContentDigestTest {
@Test
public void emptySHA256() throws Exception {
assertDigest(new byte[0], "Empty SHA-256 digest");
}
@Test
public void hiSHA256() throws Exception {
assertDigest("Hi".getBytes("UTF-8"), "Empty SHA-256 digest");
}
@Test
public void helloWorldSHA256() throws Exception {
assertDigest("Hello World!".getBytes("UTF-8"), "Empty SHA-256 digest");
}
@Test
public void minusSHA256() throws Exception {
assertDigest(new byte[]{-75, 119}, "SHA-256 digest for negative byte");
}
@Test
public void computeSHA256s() throws Exception {
for (int i = 0; i < 100; i++) {
long seed = System.currentTimeMillis();
final String msg = "Digest for seed " + seed + " is the same";
Random random = new Random(seed);
int len = random.nextInt(2048);
byte[] arr = new byte[len];
random.nextBytes(arr);
assertDigest(arr, msg);
}
}
private static void assertDigest(byte[] arr, final String msg) throws Exception {
byte[] result = MessageDigest.getInstance("SHA-256").digest(arr);
String expecting = new BigInteger(1, result).toString(16);
// Add leading `0`s if missing to allign to standard 64 digit SHA-256 format.
while (expecting.length() < 64) {
expecting = '0' + expecting;
}
Method m = Class.forName("com.oracle.truffle.api.source.Source").getDeclaredMethod("digest", byte[].class, int.class, int.class);
ReflectionUtils.setAccessible(m, true);
String own = (String) m.invoke(null, arr, 0, arr.length);
Assert.assertEquals(msg, expecting, own);
}
}