java加密解密
package com.util;
import java.math.BigInteger;
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;
/**
*
* @author skyline
*
*/
public class DataEncryptUtil {
public static final String KEY_SHA = "SHA";
public static final String KEY_MD5 = "MD5";
/**
* MAC算法可选以下多种算法
*
* <pre>
* HmacMD5
* HmacSHA1
* HmacSHA256
* HmacSHA384
* HmacSHA512
* </pre>
*/
public static final String KEY_MAC = "HmacMD5";
/**
* BASE64解密
*
* @param key = 需要解密的密码字符串
* @return
* @throws Exception
*/
public static byte[] decryptBASE64(String key) throws Exception {
return (new BASE64Decoder()).decodeBuffer(key);
}
/**
* BASE64加密
*
* @param key = 需要加密的字符数组
* @return
* @throws Exception
*/
public static String encryptBASE64(byte[] key) throws Exception {
return (new BASE64Encoder()).encodeBuffer(key);
}
/**
* MD5加密
*
* @param data = 需要加密的字符数组
* @return
* @throws Exception
*/
public static byte[] encryptMD5(byte[] data) throws Exception {
MessageDigest md5 = MessageDigest.getInstance(KEY_MD5);
md5.update(data);
return md5.digest();
}
/**
* SHA加密
*
* @param data = 需要加密的字符数组
* @return
* @throws Exception
*/
public static byte[] encryptSHA(byte[] data) throws Exception {
MessageDigest sha = MessageDigest.getInstance(KEY_SHA);
sha.update(data);
return sha.digest();
}
/**
* 初始化HMAC密钥
*
* @return
* @throws Exception
*/
public static String initMacKey() throws Exception {
KeyGenerator keyGenerator = KeyGenerator.getInstance(KEY_MAC);
SecretKey secretKey = keyGenerator.generateKey();
return encryptBASE64(secretKey.getEncoded());
}
/**
* HMAC加密
*
* @param data = 密匙加密过的字符数组
* @param key = 需要加密的字符串
* @return
* @throws Exception
*/
public static byte[] encryptHMAC(byte[] data, String key) throws Exception {
SecretKey secretKey = new SecretKeySpec(decryptBASE64(key), KEY_MAC);
Mac mac = Mac.getInstance(secretKey.getAlgorithm());
mac.init(secretKey);
return mac.doFinal(data);
}
public static void main(String[] args) {
String inputStr = "简单加密";
System.err.println("原文:\n" + inputStr);
byte[] inputData = inputStr.getBytes();
String code;
try {
code = DataEncryptUtil.encryptBASE64(inputData);
System.err.println("BASE64加密后:\n" + code);
byte[] output = DataEncryptUtil.decryptBASE64(code);
String outputStr = new String(output);
System.err.println("BASE64解密后:\n" + outputStr);
System.err.println("验证base64加密解密一致性"+inputStr.equals(outputStr));
String key = DataEncryptUtil.initMacKey();
System.err.println("Mac密钥:\n" + key);
DataEncryptUtil.encryptHMAC( inputData, key);
BigInteger mac = new
BigInteger(DataEncryptUtil.encryptHMAC(inputData, inputStr));
System.err.println("HMAC:\n" + mac.toString(16));
BigInteger md5 = new
BigInteger(DataEncryptUtil.encryptMD5(inputData));
System.err.println("MD5:\n" + md5.toString(16));
BigInteger sha = new
BigInteger(DataEncryptUtil.encryptSHA(inputData));
System.err.println("SHA:\n" + sha.toString(32));
} catch (Exception e) {
e.printStackTrace();
}
}
}