Here you can find the source of getHash(final byte[] data, final String hashAlgorithm)
private static String getHash(final byte[] data, final String hashAlgorithm)
//package com.java2s; /**/*from w w w. j a va 2 s. co m*/ * * BibSonomy-Common - Common things (e.g., exceptions, enums, utils, etc.) * * Copyright (C) 2006 - 2011 Knowledge & Data Engineering Group, * University of Kassel, Germany * http://www.kde.cs.uni-kassel.de/ * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; public class Main { private static String getHash(final byte[] data, final String hashAlgorithm) { if (data == null) return null; try { final MessageDigest md = MessageDigest.getInstance(hashAlgorithm); return toHexString(md.digest(data)); } catch (final NoSuchAlgorithmException e) { return null; } } /** * Converts a buffer of bytes into a string of hex values. * * @param buffer * array of bytes which should be converted * @return hex string representation of buffer */ public static String toHexString(byte[] buffer) { final StringBuilder result = new StringBuilder(); for (int i = 0; i < buffer.length; i++) { String hex = Integer.toHexString(buffer[i]); if (hex.length() == 1) { hex = "0" + hex; } result.append(hex.substring(hex.length() - 2)); } return result.toString(); } }