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package org.bouncycastle.crypto.test;
import org.bouncycastle.util.test.SimpleTest;
import org.bouncycastle.util.encoders.Hex;
import org.bouncycastle.util.Arrays;
import org.bouncycastle.crypto.prng.DigestRandomGenerator;
import org.bouncycastle.crypto.digests.SHA1Digest;
import org.bouncycastle.crypto.digests.SHA256Digest;
import org.bouncycastle.crypto.Digest;
public class DigestRandomNumberTest
extends SimpleTest
{
private static final byte[] ZERO_SEED = { 0, 0, 0, 0, 0, 0, 0, 0 };
private static final byte[] TEST_SEED = Hex.decode("81dcfafc885914057876");
private static final byte[] expected0SHA1 = Hex.decode("95bca677b3d4ff793213c00892d2356ec729ee02");
private static final byte[] noCycle0SHA1 = Hex.decode("d57ccd0eb12c3938d59226412bc1268037b6b846");
private static final byte[] expected0SHA256 = Hex.decode("587e2dfd597d086e47ddcd343eac983a5c913bef8c6a1a560a5c1bc3a74b0991");
private static final byte[] noCycle0SHA256 = Hex.decode("e5776c4483486ba7be081f4e1b9dafbab25c8fae290fd5474c1ceda2c16f9509");
private static final byte[] expected100SHA1 = Hex.decode("b9d924092546e0876cafd4937d7364ebf9efa4be");
private static final byte[] expected100SHA256 = Hex.decode("fbc4aa54b948b99de104c44563a552899d718bb75d1941cc62a2444b0506abaf");
private static final byte[] expectedTestSHA1 = Hex.decode("e9ecef9f5306daf1ac51a89a211a64cb24415649");
private static final byte[] expectedTestSHA256 = Hex.decode("bdab3ca831b472a2fa09bd1bade541ef16c96640a91fcec553679a136061de98");
private static final byte[] sha1Xors = Hex.decode("7edcc1216934f3891b03ffa65821611a3e2b1f79");
private static final byte[] sha256Xors = Hex.decode("5ec48189cc0aa71e79c707bc3c33ffd47bbba368a83d6cfebf3cd3969d7f3eed");
public String getName()
{
return "DigestRandomNumber";
}
private void doExpectedTest(Digest digest, int seed, byte[] expected)
{
doExpectedTest(digest, seed, expected, null);
}
private void doExpectedTest(Digest digest, int seed, byte[] expected, byte[] noCycle)
{
DigestRandomGenerator rGen = new DigestRandomGenerator(digest);
byte[] output = new byte[digest.getDigestSize()];
rGen.addSeedMaterial(seed);
for (int i = 0; i != 1024; i++)
{
rGen.nextBytes(output);
}
if (noCycle != null)
{
if (Arrays.areEqual(noCycle, output))
{
fail("seed not being cycled!");
}
}
if (!Arrays.areEqual(expected, output))
{
fail("expected output doesn't match");
}
}
private void doExpectedTest(Digest digest, byte[] seed, byte[] expected)
{
DigestRandomGenerator rGen = new DigestRandomGenerator(digest);
byte[] output = new byte[digest.getDigestSize()];
rGen.addSeedMaterial(seed);
for (int i = 0; i != 1024; i++)
{
rGen.nextBytes(output);
}
if (!Arrays.areEqual(expected, output))
{
fail("expected output doesn't match");
}
}
private void doCountTest(Digest digest, byte[] seed, byte[] expectedXors)
{
DigestRandomGenerator rGen = new DigestRandomGenerator(digest);
byte[] output = new byte[digest.getDigestSize()];
int[] averages = new int[digest.getDigestSize()];
byte[] ands = new byte[digest.getDigestSize()];
byte[] xors = new byte[digest.getDigestSize()];
byte[] ors = new byte[digest.getDigestSize()];
rGen.addSeedMaterial(seed);
for (int i = 0; i != 1000000; i++)
{
rGen.nextBytes(output);
for (int j = 0; j != output.length; j++)
{
averages[j] += output[j] & 0xff;
ands[j] &= output[j];
xors[j] ^= output[j];
ors[j] |= output[j];
}
}
for (int i = 0; i != output.length; i++)
{
if ((averages[i] / 1000000) != 127)
{
fail("average test failed for " + digest.getAlgorithmName());
}
if (ands[i] != 0)
{
fail("and test failed for " + digest.getAlgorithmName());
}
if ((ors[i] & 0xff) != 0xff)
{
fail("or test failed for " + digest.getAlgorithmName());
}
if (xors[i] != expectedXors[i])
{
fail("xor test failed for " + digest.getAlgorithmName());
}
}
}
public void performTest()
throws Exception
{
doExpectedTest(new SHA1Digest(), 0, expected0SHA1, noCycle0SHA1);
doExpectedTest(new SHA256Digest(), 0, expected0SHA256, noCycle0SHA256);
doExpectedTest(new SHA1Digest(), 100, expected100SHA1);
doExpectedTest(new SHA256Digest(), 100, expected100SHA256);
doExpectedTest(new SHA1Digest(), ZERO_SEED, expected0SHA1);
doExpectedTest(new SHA256Digest(), ZERO_SEED, expected0SHA256);
doExpectedTest(new SHA1Digest(), TEST_SEED, expectedTestSHA1);
doExpectedTest(new SHA256Digest(), TEST_SEED, expectedTestSHA256);
doCountTest(new SHA1Digest(), TEST_SEED, sha1Xors);
doCountTest(new SHA256Digest(), TEST_SEED, sha256Xors);
}
public static void main(
String[] args)
{
runTest(new DigestRandomNumberTest());
}
}
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