常用Java 加密算法

//汇总常用Java 加密算法


import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;

import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.SecureRandom;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.Mac;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.SecretKeySpec;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

/**
 * 基础加密组件
 * 
 * @author 梁栋
 * @version 1.0
 * @since 1.0
 */
public class Coder {
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
 * @return
 * @throws Exception
 */
public static byte[] decryptBASE64(String key) throws Exception {
return (new BASE64Decoder()).decodeBuffer(key);
}

/**
 * BASE64加密
 * 
 * @param key
 * @return
 * @throws Exception
 */
public static String encryptBASE64(byte[] key) throws Exception {
return (new BASE64Encoder()).encodeBuffer(key);
}

/**
 * MD5加密
 * 
 * @param data
 * @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
 * @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();
System.out.println("MAC key====:" + secretKey.getEncoded());
return encryptBASE64(secretKey.getEncoded());
}

/**
 * HMAC加密
 * 
 * @param data
 * @param key
 * @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);

}

/**
 * 加密
 * 
 * @param datasource
 *            byte[]
 * @param password
 *            String
 * @return byte[]
 */
public static byte[] encrypt(byte[] datasource, String password) {
try {
SecureRandom random = new SecureRandom();
DESKeySpec desKey = new DESKeySpec(password.getBytes());
// 创建一个密匙工厂，然后用它把DESKeySpec转换成
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey securekey = keyFactory.generateSecret(desKey);
// Cipher对象实际完成加密操作
Cipher cipher = Cipher.getInstance("DES");
// 用密匙初始化Cipher对象
cipher.init(Cipher.ENCRYPT_MODE, securekey, random);
// 现在，获取数据并加密
// 正式执行加密操作
return cipher.doFinal(datasource);
} catch (Throwable e) {
e.printStackTrace();
}
return null;
}

/**
 * 解密
 * 
 * @param src
 *            byte[]
 * @param password
 *            String
 * @return byte[]
 * @throws Exception
 */
public static byte[] decrypt(byte[] src, String password) throws Exception {
// DES算法要求有一个可信任的随机数源
SecureRandom random = new SecureRandom();
// 创建一个DESKeySpec对象
DESKeySpec desKey = new DESKeySpec(password.getBytes());
// 创建一个密匙工厂
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
// 将DESKeySpec对象转换成SecretKey对象
SecretKey securekey = keyFactory.generateSecret(desKey);
// Cipher对象实际完成解密操作
Cipher cipher = Cipher.getInstance("DES");
// 用密匙初始化Cipher对象
cipher.init(Cipher.DECRYPT_MODE, securekey, random);
// 真正开始解密操作
return cipher.doFinal(src);
}

public static void main(String[] args) throws Exception {
String inputStr = "简单加密";
System.err.println("原文:\n" + inputStr);

byte[] inputData = inputStr.getBytes();
String code = Coder.encryptBASE64(inputData);

System.err.println("BASE64加密后:\n" + code);

byte[] output = Coder.decryptBASE64(code);

String outputStr = new String(output);

System.err.println("BASE64解密后:\n" + outputStr);

// 验证BASE64加密解密一致性
assertEquals(inputStr, outputStr);

// 验证MD5对于同一内容加密是否一致
assertArrayEquals(Coder.encryptMD5(inputData), Coder.encryptMD5(inputData));

// 验证SHA对于同一内容加密是否一致
assertArrayEquals(Coder.encryptSHA(inputData), Coder.encryptSHA(inputData));

String key = Coder.initMacKey();
System.err.println("Mac密钥:\n" + key);

// 验证HMAC对于同一内容，同一密钥加密是否一致
assertArrayEquals(Coder.encryptHMAC(inputData, key), Coder.encryptHMAC(inputData, key));

BigInteger md5 = new BigInteger(Coder.encryptMD5(inputData));
System.err.println("MD5:\n" + md5.toString(16));

BigInteger sha = new BigInteger(Coder.encryptSHA(inputData));
System.err.println("SHA:\n" + sha.toString(32));

BigInteger mac = new BigInteger(Coder.encryptHMAC(inputData, inputStr));
System.err.println("HMAC:\n" + mac.toString(16));

String str = "admin";
// 密码，长度要是8的倍数
String password = "!@#$%^&*1";

byte[] result = DES.encrypt(str.getBytes(), password);
System.out.println("DES加密后：\n" + new String(result));
// 直接将如上内容解密
try {
byte[] decryResult = DES.decrypt(result, password);
System.out.println("DES解密后：\n" + new String(decryResult));
} catch (Exception e1) {
e1.printStackTrace();
}
}
}