Here you can find the source of sha256()
public static MessageDigest sha256()
//package com.java2s; /**/*from w w w .ja v a 2 s . c o m*/ * This file is part of git-as-svn. It is subject to the license terms * in the LICENSE file found in the top-level directory of this distribution * and at http://www.gnu.org/licenses/gpl-2.0.html. No part of git-as-svn, * including this file, may be copied, modified, propagated, or distributed * except according to the terms contained in the LICENSE file. */ import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; public class Main { public static MessageDigest sha256() { try { return MessageDigest.getInstance("SHA-256"); } catch (NoSuchAlgorithmException e) { throw new IllegalStateException(e); } } }