package cn7.javasec.blatt8;

import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.FileInputStream;
import java.security.DigestInputStream;
import java.security.MessageDigest;

public class Aufgabe2b {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		String alg = "SHA-512";
		//alg = "MD5";
		
		try {
			MessageDigest md = MessageDigest.getInstance(alg);			
			
			DigestInputStream dis = new DigestInputStream(new FileInputStream("digest.file"), md);
						
			while ((dis.read()) != -1);
			dis.close();
			
			// out
			byte[] out = md.digest();
			BufferedInputStream br = new BufferedInputStream(new ByteArrayInputStream(out));
			int k = 0;
			String output = "";
			while ((k = br.read()) != -1) {
				k = k & 0xFF;
				if (k < 16)
					output += "0";
				output += Integer.toString(k, 16).toUpperCase() + " ";
			}
			System.out.println("OUT:\n"  +output);
			
			
			System.out.println();
		} catch (Exception e) {
			e.printStackTrace();
		}		

	}

}