Here you can find the source of sha1(String input)
public static String sha1(String input)
//package com.java2s; /*//from w ww . j av a 2 s .c o m * Copyright 2002-2015 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ public class Main { public static String sha1(String input) { return hash(input, "SHA1"); } private static String hash(String input, String algorithm) { try { java.security.MessageDigest md = java.security.MessageDigest.getInstance(algorithm); byte[] array = md.digest(input.getBytes()); StringBuffer sb = new StringBuffer(); for (int i = 0; i < array.length; ++i) { sb.append(Integer.toHexString((array[i] & 0xFF) | 0x100).substring(1, 3)); } return sb.toString(); } catch (Exception e) { //ignore } throw new IllegalArgumentException("The input " + input + " or algorithm " + algorithm + " is illegal"); } }