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JAVA單向加密(MD5，SHA，MAC)

具體代碼如下：

import java.security.MessageDigest;

import javax.crypto.KeyGenerator;

import javax.crypto.Mac;

import javax.crypto.SecretKey;

import javax.crypto.spec.SecretKeySpec;

import sun.misc.BASE64Decoder;

import sun.misc.BASE64Encoder;

/**

* 加密（主要有：MD4,SHA,MAC）

*

* @author kinkding

* @history 2009-6-3

*/

public class MyEncrypt {

/** MD5 加密 */

public static byte[] encryptMD5(byte[] data) throws Exception {

MessageDigest md5 = MessageDigest.getInstance("MD5");

md5.update(data);

return md5.digest();

}

/** SHA 加密 */

public static byte[] encryptSHA(byte[] data) throws Exception {

MessageDigest sha = MessageDigest.getInstance("SHA");

sha.update(data);

return sha.digest();

}

/** 取得HMAC密鑰 */

public static String getMacKey() throws Exception {

KeyGenerator keyGenerator = KeyGenerator.getInstance("HmacMD5");

SecretKey secretKey = keyGenerator.generateKey();

return new BASE64Encoder().encode(secretKey.getEncoded());

}

/** 執行加密 */

public static byte[] encryptHMAC(byte[] data, String key) throws Exception {

byte[] bkey = new BASE64Decoder().decodeBuffer(key);

SecretKey secretKey = new SecretKeySpec(bkey, "HmacMD5");

Mac mac = Mac.getInstance(secretKey.getAlgorithm());

mac.init(secretKey);

return mac.doFinal(data);

}

private static String toHex(byte[] buffer) {

StringBuffer sb = new StringBuffer(buffer.length * 3);

for (int i = 0; i < buffer.length; i++) {

sb.append(Character.forDigit((buffer[i] & 0xf0) >> 4, 16));

sb.append(Character.forDigit(buffer[i] & 0x0f, 16));

}

return sb.toString();

}

public static void main(String[] args) {

String msg = "生活真好^_^";

byte[] data = msg.getBytes();

try {

System.out.println("msg:" + msg);

System.out.println("md5:" + toHex(encryptMD5(data)));

System.out.println("sha:" + toHex(encryptSHA(data)));

String key = getMacKey();

System.out.println("mac key:" + key);

System.out.println("mac:" + toHex(encryptHMAC(data, key)));

} catch (Exception e) {

e.printStackTrace();

}

運行效果如下：

msg:生活真好^_^

md5:e0649dfaef57789734e920c7ecb9c4ea

sha:a4bd855836de26b2323778b797629fed4416f12f

mac key:zBPe28oho2H84+Mg8mF4abpd0MQvdjgqgFdX4hmUQQbOGnX1aFq/oQnogsHVIczgx1AZ1s2/ncPz

tBQIGLZUnw==

mac:87f4140161ad43797059e85dd9962897

posted on 2009-06-03 23:20 俊星閱讀(1269) 評論(0) 編輯收藏

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