MAC算法結合了MD5和SHA算法的優點,並加入密鑰的支持,是一種更爲安全的消息摘要算法。java
MAC(Message Authentication Code,消息認證碼算法)是含有密鑰的散列函數算法,兼容了MD和SHA算法的特性,並在此基礎上加入了密鑰。日次,咱們也常把MAC稱爲HMAC(keyed-Hash Message Authentication Code)。算法
MAC算法主要集合了MD和SHA兩大系列消息摘要算法。MD系列的算法有HmacMD二、HmacMD四、HmacMD5三種算法;SHA系列的算法有HmacSHA一、HmacSHA22四、HmacSHA25六、HmacSHA384.HmacSHA512五種算法。安全
通過MAC算法獲得的摘要值也能夠使用十六進制編碼表示,其摘要值長度與參與實現的摘要值長度相同。例如,HmacSHA1算法獲得的摘要長度就是SHA1算法獲得的摘要長度,都是160位二進制碼,換算成十六進制編碼爲40位。ide
package com.soap.util; import java.security.NoSuchAlgorithmException; import javax.crypto.KeyGenerator; import javax.crypto.Mac; import javax.crypto.SecretKey; import javax.crypto.spec.SecretKeySpec; import javax.xml.bind.annotation.adapters.HexBinaryAdapter; /** * Hash Message Authentication Code,散列消息鑑別碼 基於密鑰的Hash算法的認證協議。 * * @author Roger */ public class HMACUtil { /** * 構建HmacMD5密鑰 * * @return * @throws Exception */ public static byte[] initHmacMD5Key() throws Exception { // 初始化HmacMD5摘要算法的密鑰產生器 KeyGenerator generator = KeyGenerator.getInstance("HmacMD5"); // 產生密鑰 SecretKey secretKey = generator.generateKey(); // 得到密鑰 byte[] key = secretKey.getEncoded(); return key; } /** * 生成32位HmacMD5加密數據 * @param data * @param key * @return * @throws Exception */ public static String encodeHmacMD5(byte[] data, byte[] key) throws Exception { // 還原密鑰 SecretKey secretKey = new SecretKeySpec(key, "HmacMD5"); // 實例化Mac Mac mac = Mac.getInstance(secretKey.getAlgorithm()); // 初始化mac mac.init(secretKey); // 執行消息摘要 byte[] digest = mac.doFinal(data); return new HexBinaryAdapter().marshal(digest);// 轉爲十六進制的字符串 } /** * 構建HmacSHA1密鑰 * @return * @throws NoSuchAlgorithmException */ public static byte[] initHmacSHAKey() throws NoSuchAlgorithmException { // 初始化HmacMD5摘要算法的密鑰產生器 KeyGenerator generator = KeyGenerator.getInstance("HmacSHA1"); // 產生密鑰 SecretKey secretKey = generator.generateKey(); // 得到密鑰 byte[] key = secretKey.getEncoded(); return key; } /** * 生成40位HmacSHA1加密數據 * @param data * @param key * @return * @throws Exception */ public static String encodeHmacSHA(byte[] data, byte[] key) throws Exception { // 還原密鑰 SecretKey secretKey = new SecretKeySpec(key, "HmacSHA1"); // 實例化Mac Mac mac = Mac.getInstance(secretKey.getAlgorithm()); // 初始化mac mac.init(secretKey); // 執行消息摘要 byte[] digest = mac.doFinal(data); return new HexBinaryAdapter().marshal(digest);// 轉爲十六進制的字符串 } /** * 構建HmacSHA256密鑰 * @return * @throws NoSuchAlgorithmException */ public static byte[] initHmacSHA256Key() throws NoSuchAlgorithmException { // 初始化HmacMD5摘要算法的密鑰產生器 KeyGenerator generator = KeyGenerator.getInstance("HmacSHA256"); // 產生密鑰 SecretKey secretKey = generator.generateKey(); // 得到密鑰 byte[] key = secretKey.getEncoded(); return key; } /** * 生成64位HmacSHA256加密數據 * @param data * @param key * @return * @throws Exception */ public static String encodeHmacSHA256(byte[] data, byte[] key) throws Exception { // 還原密鑰 SecretKey secretKey = new SecretKeySpec(key, "HmacSHA256"); // 實例化Mac Mac mac = Mac.getInstance(secretKey.getAlgorithm()); // 初始化mac mac.init(secretKey); // 執行消息摘要 byte[] digest = mac.doFinal(data); return new HexBinaryAdapter().marshal(digest);// 轉爲十六進制的字符串 } /** * 構建HmacSHA384密鑰 * @return * @throws NoSuchAlgorithmException */ public static byte[] initHmacSHA384Key() throws NoSuchAlgorithmException { // 初始化HmacMD5摘要算法的密鑰產生器 KeyGenerator generator = KeyGenerator.getInstance("HmacSHA384"); // 產生密鑰 SecretKey secretKey = generator.generateKey(); // 得到密鑰 byte[] key = secretKey.getEncoded(); return key; } /** * 生成96位HmacSHA384加密數據 * @param data * @param key * @return * @throws Exception */ public static String encodeHmacSHA384(byte[] data, byte[] key) throws Exception { // 還原密鑰 SecretKey secretKey = new SecretKeySpec(key, "HmacSHA384"); // 實例化Mac Mac mac = Mac.getInstance(secretKey.getAlgorithm()); // 初始化mac mac.init(secretKey); // 執行消息摘要 byte[] digest = mac.doFinal(data); return new HexBinaryAdapter().marshal(digest);// 轉爲十六進制的字符串 } /** * 構建HmacSHA512密鑰 * @return * @throws NoSuchAlgorithmException */ public static byte[] initHmacSHA512Key() throws NoSuchAlgorithmException { // 初始化HmacMD5摘要算法的密鑰產生器 KeyGenerator generator = KeyGenerator.getInstance("HmacSHA512"); // 產生密鑰 SecretKey secretKey = generator.generateKey(); // 得到密鑰 byte[] key = secretKey.getEncoded(); return key; } /** * 生成128位HmacSHA512加密信息 * @param data * @param key * @return * @throws Exception */ public static String encodeHmacSHA512(byte[] data, byte[] key) throws Exception { // 還原密鑰 SecretKey secretKey = new SecretKeySpec(key, "HmacSHA512"); // 實例化Mac Mac mac = Mac.getInstance(secretKey.getAlgorithm()); // 初始化mac mac.init(secretKey); // 執行消息摘要 byte[] digest = mac.doFinal(data); return new HexBinaryAdapter().marshal(digest);// 轉爲十六進制的字符串 } public static void main(String[] args) throws Exception { String testString = "asdasd"; byte[] keyHmacMD5 = initHmacMD5Key(); System.out.println(encodeHmacMD5(testString.getBytes(), keyHmacMD5)); System.out.println(encodeHmacMD5(testString.getBytes(), keyHmacMD5) .length()); byte[] keyHmacSHA1 = initHmacSHAKey(); System.out.println(encodeHmacSHA(testString.getBytes(), keyHmacSHA1)); System.out.println(encodeHmacSHA(testString.getBytes(), keyHmacSHA1) .length()); byte[] keyHmacSHA256 = initHmacSHA256Key(); System.out.println(encodeHmacSHA256(testString.getBytes(), keyHmacSHA256)); System.out.println(encodeHmacSHA256(testString.getBytes(), keyHmacSHA256).length()); byte[] keyHmacSHA384 = initHmacSHA384Key(); System.out.println(encodeHmacSHA384(testString.getBytes(), keyHmacSHA384)); System.out.println(encodeHmacSHA384(testString.getBytes(), keyHmacSHA384).length()); byte[] keyHmacSHA512 = initHmacSHA512Key(); System.out.println(encodeHmacSHA512(testString.getBytes(), keyHmacSHA512)); System.out.println(encodeHmacSHA512(testString.getBytes(), keyHmacSHA512).length()); } }