SecurityUtil.java

package br.ufrgs.inf.dsmoura.repository.controller.util;

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

public class SecurityUtil {
	public static String generateHash(String plaintext) {
		try {
			StringBuilder hash = new StringBuilder();
			MessageDigest sha = MessageDigest.getInstance("SHA-1");
			byte[] hashedBytes = sha.digest(plaintext.getBytes());
			char[] digits = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
										'a', 'b', 'c', 'd', 'e', 'f' };
			for (int idx = 0; idx < hashedBytes.length; ++idx) {
				byte b = hashedBytes[idx];
				hash.append(digits[(b & 0xf0) >> 4]);
				hash.append(digits[b & 0x0f]);
			}
			return hash.toString();
		} catch (NoSuchAlgorithmException e) {
			throw new RuntimeException(e);
		}
	}
}