package org.uli.sha256; import java.io.IOException; import java.io.UnsupportedEncodingException; import java.math.BigInteger; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import org.uli.util.FileToByteArray; public class SHA256Sum { public String sha2hex(byte[] bytesOfMessage) throws NoSuchAlgorithmException, UnsupportedEncodingException, IOException { MessageDigest md = MessageDigest.getInstance("SHA-256"); byte[] thedigest = md.digest(bytesOfMessage); BigInteger bigInt = new BigInteger(1, thedigest); String hashtext = bigInt.toString(16); // Now we need to zero pad it if you actually want the full 32 chars. while (hashtext.length() < 32) { hashtext = "0" + hashtext; } return hashtext; } static public void main(String[] args) throws Exception { SHA256Sum sha256 = new SHA256Sum(); if (args.length <= 0) { FileToByteArray ftba = new FileToByteArray(System.in); System.out.println(sha256.sha2hex(ftba.getBytes()) + " " + ftba.getFilename()); } else { for (String arg : args) { FileToByteArray ftba = new FileToByteArray(arg); System.out.println(sha256.sha2hex(ftba.getBytes()) + " " + ftba.getFilename()); } } } }