Sha.java

package org.oregami.util;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Sha {
	public static String hash256(String data) {
		MessageDigest md;
		try {
			md = MessageDigest.getInstance("SHA-256");
		} catch (NoSuchAlgorithmException e) {
			throw new RuntimeException(e);
		}
		md.update(data.getBytes());
		return bytesToHex(md.digest());
	}

	public static String bytesToHex(byte[] bytes) {
		StringBuffer result = new StringBuffer();
		for (byte byt : bytes)
			result.append(Integer.toString((byt & 0xff) + 0x100, 16).substring(
					1));
		return result.toString();
	}
}