java加密算法--MD5加密和哈希散列帶秘鑰加密算法源碼
最近學習加密算法的知識，利用MD5加密，百度一下網上資料很多，不是很詳細，這裡就整理下如何實現用MD5加密和哈希散列帶秘鑰加密算法，大家可以看下。
實現代碼：
package com.ompa.common.utils;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;import javax.crypto.Mac;import javax.crypto.SecretKey;import javax.crypto.spec.SecretKeySpec;/*** 採用MD5加密* * @author zhangcd* @date 2016-4-29*/public class EncryptUtil { private static final String MAC_NAME = "HmacSHA1"; private static final String ENCODING = "UTF-8"; private static final String key = "iloveyou";/*** * MD5加碼生成32位md5碼*/ public static String string2MD5(String inStr){ MessageDigest md5 = null; try{ md5 = MessageDigest.getInstance("MD5"); }catch (Exception e){ System.out.println(e.toString()); e.printStackTrace(); return ""; } char[] charArray = inStr.toCharArray(); byte[] byteArray = new byte[charArray.length]; for (int i = 0; i < charArray.length; i++) byteArray[i] = (byte) charArray[i]; byte[] md5Bytes = md5.digest(byteArray); StringBuffer hexValue = new StringBuffer(); for (int i = 0; i < md5Bytes.length; i++){ int val = ((int) md5Bytes[i]) & 0xff; if (val < 16) hexValue.append("0"); hexValue.append(Integer.toHexString(val)); } return hexValue.toString(); } /*** * MD5加密生成32位md5碼*/ public static String stringMD5(String inStr){ return string2MD5(string2MD5(inStr)); }/** * 加密解密算法*/ public static String convertMD5(String inStr){ char[] a = inStr.toCharArray(); for (int i = 0; i < a.length; i++){ a[i] = (char) (a[i] ^ 't'); } String s = new String(a); return s; } /** * HMAC-SHA1 * @param encryptText * @param encryptKey * @return * @throws Exception */ public static String HmacSHA1Encrypt(String encryptText, String encryptKey) throws Exception { byte[] data=encryptKey.getBytes(ENCODING); SecretKey secretKey = new SecretKeySpec(data, MAC_NAME); Mac mac = Mac.getInstance(MAC_NAME); mac.init(secretKey); byte[] text = encryptText.getBytes(ENCODING); byte[] str = mac.doFinal(text);// Create Hex StringStringBuffer hexString = new StringBuffer();// 字節數組轉換為十六進制數for (int i = 0; i < str.length; i++) {String shaHex = Integer.toHexString(str[i] & 0xFF);if (shaHex.length() < 2) {hexString.append(0);}hexString.append(shaHex);}return hexString.toString();} public static String convertSHA1(String instr){try {return HmacSHA1Encrypt(instr,key);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();return "";}}// 測試主函數public static void main(String args[]) throws Exception { //哈希散列帶秘鑰加密String tt = convertSHA1("123456");System.out.println(tt);//MD5加密String s = new String("123456"); System.out.println("原始：" + s); System.out.println("MD5後：" + string2MD5(s)); System.out.println("MD5加密後：" + stringMD5(s));} }感謝閱讀，希望能幫助到大家，謝謝大家對本站的支持！