加密、解密
关注1：http://hello-nick-xu.iteye.com/blog/2103775
关注2：http://hello-nick-xu.iteye.com/blog/2103781
package com.rock;
import java.io.IOException;
import java.security.Key;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.Signature;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
public class EncryptUtil {
private static Log logger = LogFactory.getLog(EncryptUtil.class);
private static final int KEY_SIZE = 1024;
private static final String MD5_ALGORITHM= "md5";
private static final String DES_ALGORITHM= "des";
private static final String RSA_ALGORITHM= "rsa";
private static final String SIGNATURE_ALGORITHM= "MD5withRSA";
private static MessageDigest md5;
private static BASE64Encoder encoder;
private static BASE64Decoder decoder;
private static SecureRandom random;
private static KeyPair keyPair;
private EncryptUtil() {
}
static {
try {
md5 = MessageDigest.getInstance(MD5_ALGORITHM);
KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(RSA_ALGORITHM);
keyPairGenerator.initialize(KEY_SIZE);
keyPair = keyPairGenerator.generateKeyPair();
}
catch (NoSuchAlgorithmException e) {
// Exception handler
logger.error(e);
}
encoder = new BASE64Encoder();
decoder = new BASE64Decoder();
random = new SecureRandom();
}
/**
* 功能简述: 使用md5进行单向加密.
*/
public static String encryptMD5(String plainText) {
byte[] cipherData = md5.digest(plainText.getBytes());
StringBuilder builder = new StringBuilder();
for(byte cipher : cipherData) {
String toHexStr = Integer.toHexString(cipher & 0xff);
builder.append(toHexStr.length() == 1 ? "0" + toHexStr : toHexStr);
}
return builder.toString();
}
// public static void main(String[] args) {
// System.out.println("=======>>MD5加密： "+encryptMD5("xueshuanglong_198822"));
// //8ff95d3b0db752ac6d10b21bc05dec38
// }
/**
* 功能简述: 使用BASE64进行加密.
* @param plainData 明文数据
* @return 加密之后的文本内容
*/
public static String encryptBASE64(byte[] plainData) {
return encoder.encode(plainData);
}
// public static void main(String[] args) {
//
// System.out.println("=======>>BASE64加密： "+encryptBASE64("xueshuanglong_198822".getBytes()));
// //eHVlc2h1YW5nbG9uZ18xOTg4MjI=
// }
/**
* 功能简述: 使用BASE64进行解密.
* @param cipherText 密文文本
* @return 解密之后的数据
*/
public static byte[] decryptBASE64(String cipherText) {
byte[] plainData = null;
try {
plainData = decoder.decodeBuffer(cipherText);
}
catch (IOException e) {
// Exception handler
logger.error(e);
}
return plainData;
}
// public static void main(String[] args) {
//
// System.out.println("=======>>BASE64解密： "+new String(decryptBASE64("eHVlc2h1YW5nbG9uZ18xOTg4MjI=")));
// //eHVlc2h1YW5nbG9uZ18xOTg4MjI=
//}
/**
* 功能简述: 使用DES算法进行加密.
* @param plainData 明文数据
* @param key 加密密钥
* @return
*/
public static byte[] encryptDES(byte[] plainData, String key) {
return processCipher(plainData, createSecretKey(key), Cipher.ENCRYPT_MODE, DES_ALGORITHM);
}
// public static void main(String[] args) {
// System.out.println("=======>>DES加密： "+encryptBASE64(encryptDES("xueshuanglong_198822".getBytes(), "1234567890")));
// //AW+L+c1d/zTRW0xFkA05Wft+S8LmvkCL
// }
/**
* 功能简述: 使用DES算法进行解密.
* @param cipherData 密文数据
* @param key 解密密钥
* @return
*/
public static byte[] decryptDES(byte[] cipherData, String key) {
return processCipher(cipherData, createSecretKey(key), Cipher.DECRYPT_MODE, DES_ALGORITHM);
}
// public static void main(String[] args) {
// System.out.println("=======>>DES解密： "+new String(decryptDES(decryptBASE64("AW+L+c1d/zTRW0xFkA05Wft+S8LmvkCL"),"1234567890")));
//
// }
/**
* 功能简述: 根据key创建密钥SecretKey.
* @param key
* @return
*/
private static SecretKey createSecretKey(String key) {
SecretKey secretKey = null;
try {
DESKeySpec keySpec = new DESKeySpec(key.getBytes());
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES_ALGORITHM);
secretKey = keyFactory.generateSecret(keySpec);
}
catch (Exception e) {
// Exception handler
logger.error(e);
}
return secretKey;
}
/**
* 功能简述: 加密/解密处理流程.
* @param processData 待处理的数据
* @param key 提供的密钥
* @param opsMode 工作模式
* @param algorithm 使用的算法
* @return
*/
private static byte[] processCipher(byte[] processData, Key key, int opsMode, String algorithm) {
try{
Cipher cipher = Cipher.getInstance(algorithm);
cipher.init(opsMode, key, random);
return cipher.doFinal(processData);
}
catch (Exception e) {
// Exception handler
logger.error(e);
}
return null;
}
/**
* 功能简述: 创建私钥，用于RSA非对称加密.
* @return
*/
public static PrivateKey createPrivateKey() {
return keyPair.getPrivate();
}
/**
* 功能简述: 创建公钥，用于RSA非对称加密.
* @return
*/
public static PublicKey createPublicKey() {
return keyPair.getPublic();
}
/**
* 功能简述: 使用RSA算法加密.
* @param plainData 明文数据
* @param key 密钥
* @return
*/
public static byte[] encryptRSA(byte[] plainData, Key key) {
return processCipher(plainData, key, Cipher.ENCRYPT_MODE, RSA_ALGORITHM);
}
// public static void main(String[] args) {
//
// System.out.println("=======>>RSA加密： "+new BASE64Encoder().encode(encryptRSA("Hello , world !".getBytes(), createPrivateKey())));
// }
/**
* 功能简述: 使用RSA算法解密.
* @param cipherData 密文数据
* @param key 密钥
* @return
*/
public static byte[] decryptRSA(byte[] cipherData, Key key) {
return processCipher(cipherData, key, Cipher.DECRYPT_MODE, RSA_ALGORITHM);
}
public static void main(String[] args) {
byte[] cipherData = encryptRSA("Hello , world !".getBytes(), createPrivateKey());
System.out.println("=======>>RSA加密： "+new BASE64Encoder().encode(cipherData));
System.out.println("=======>>RSA解密： "+new String(decryptRSA(cipherData, createPublicKey())));
byte[] signData=createSignature(cipherData,createPrivateKey());
System.out.println("=======>>使用私钥对加密数据创建数字签名： "+new BASE64Encoder().encode(signData));
System.out.println("=======>>使用公钥对数字签名进行验证： "+verifySignature(cipherData,signData,createPublicKey()));
}
/**
* 功能简述: 使用私钥对加密数据创建数字签名.
* @param cipherData 已经加密过的数据
* @param privateKey 私钥
* @return
*/
public static byte[] createSignature(byte[] cipherData, PrivateKey privateKey) {
try {
Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
signature.initSign(privateKey);
signature.update(cipherData);
return signature.sign();
}
catch (Exception e) {
// Exception handler
logger.error(e);
}
return null;
}
/**
* 功能简述: 使用公钥对数字签名进行验证.
* @param signData 数字签名
* @param publicKey 公钥
* @return
*/
public static boolean verifySignature(byte[] cipherData, byte[] signData, PublicKey publicKey) {
try {
Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
signature.initVerify(publicKey);
signature.update(cipherData);
return signature.verify(signData);
}
catch (Exception e) {
// Exception handler
logger.error(e);
}
return false;
}
}