How can I create an SHA512 digest string in Java using bouncy castle?

Question

This unit test is failing:

    public void testDigest() throws NoSuchAlgorithmException {
    String hashExpected = "150a14ed5bea6cc731cf86c41566ac427a8db48ef1b9fd626664b3bfbb99071fa4c922f33dde38719b8c8354e2b7ab9d77e0e67fc12843920a712e73d558e197";
    MessageDigest md = new MessageDigest();
    String hashActual = new String(md.digest("hi"));
    Assert.assertEquals(hashExpected, hashActual);
}

Below is my implementation of my MessageDigest class:

import java.io.IOException;
import java.io.InputStream;
import java.security.NoSuchAlgorithmException;
import java.security.Security;


import org.bouncycastle.crypto.Digest; import org.bouncycastle.crypto.digests.SHA512Digest; import org.bouncycastle.crypto.io.DigestInputStream; import org.bouncycastle.jce.provider.BouncyCastleProvider;

public class MessageDigest { private Digest messageDigest;

public MessageDigest() throws NoSuchAlgorithmException {
    Security.addProvider(new BouncyCastleProvider());
    messageDigest = new SHA512Digest();
}

public byte[] digest(String message) {
    byte[] retValue = new byte[messageDigest.getDigestSize()];
    messageDigest.update(message.getBytes(), 0, message.length());
    messageDigest.doFinal(retValue, 0);
    return retValue;
}


} 

The test fails with the following reason:

junit.framework.ComparisonFailure: expected:<150a14ed5bea6cc731cf86c41566ac427a8db48ef1b9fd626664b3bfbb99071fa4c922f33dde38719b8c8354e2b7ab9d77e0e67fc12843920a712e73d558e197> but was:<
í[êlÇ1φÄf¬Bz�´Žñ¹ýbfd³¿»™¤É"ó=Þ8q›ŒƒTâ·«�wàæÁ(C’
q.sÕXá

I have a feeling I'm not using the right encoding scheme when I convert my byte[] digest into a string. Any help would be appreciated.

Answer 1

The value you're expecting is a Hex-encoded value. You're creating a String based on the raw bytes, which won't work.

You should use the standard Java Crypto API whenever possible instead of BouncyCastle specific APIs.

Try the following (the Hex library comes from commons-codec ):

Security.addProvider(new BouncyCastleProvider());

String data = "hello world";

MessageDigest mda = MessageDigest.getInstance("SHA-512", "BC");
byte [] digesta = mda.digest(data.getBytes());

MessageDigest mdb = MessageDigest.getInstance("SHA-512", "BC");
byte [] digestb = mdb.digest(data.getBytes());

System.out.println(MessageDigest.isEqual(digesta, digestb));

System.out.println(Hex.encodeHex(digesta));

Answer 2

只是对Kevin的回答的补充：从Java 5开始，您可以使用String.format("%0128x", new BigInteger(1, digesta))而不是commons-codec将字节数组格式化为128位十六进制编码数字零。

Answer 3

Yes, you need to turn your byte array into a hex string. :-) Look into Apache Commons Codec , especially the Hex class.

Answer 4

Since BouncyCastle 1.49 there is a handful toHexString method in the Hex class. For example:

Hex.toHexString(digest);

will return you the hash digest as a Java String in a hexadecimal format.

For reference see BouncyCastle javadoc or grepcode .