java加密解密

package com.jetsum.util;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.KeyStore;
import java.security.KeyStoreException;
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 java.security.SignatureException;
import java.security.UnrecoverableKeyException;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyAgreement;
import javax.crypto.KeyGenerator;
import javax.crypto.Mac;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.interfaces.DHPrivateKey;
import javax.crypto.interfaces.DHPublicKey;
import javax.crypto.spec.DHParameterSpec;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;
import javax.crypto.spec.SecretKeySpec;

public class CipherUtil {

    /**
     * MD5算法
     */
    private static final String ALGORITHM_MD5 = "MD5";
    /**
     * SHA算法
     */
    private static final String ALGORITHM_SHA = "SHA";
    /**
     * HMAC算法
     */
    private static final String ALGORITHM_MAC = "HmacMD5";
    /**
     * DES算法
     */
    private static final String ALGORITHM_DES = "DES";
    /**
     * PBE算法
     */
    private static final String ALGORITHM_PBE = "PBEWITHMD5andDES";

    /**
     * AESkey
     */
    private static final String KEY_AES = "AES";

    /**
     * AES算法
     */
    private static final String ALGORITHM_AES = "AES/CBC/PKCS5Padding";

    /**
     * RSA算法
     */
    private static final String KEY_ALGORITHM = "RSA";

    /**
     * 数字签名
     */
    private static final String SIGNATURE_ALGORITHM = "MD5withRSA";

    /**
     * 公钥
     */
    private static final String RSAPUBLIC_KEY = "RSAPublicKey";

    /**
     * 私钥
     */
    private static final String RSAPRIVATE_KEY = "RSAPrivateKey";

    /**
     * D-H算法
     */
    private static final String ALGORITHM_DH = "DH";

    /**
     * 默认密钥字节数
     *
     * <pre>
     * DH
     * Default Keysize 1024
     * Keysize must be a multiple of 64, ranging from 512 to 1024 (inclusive).
     * </pre>
     */
    private static final int DH_KEY_SIZE = 1024;

    /**
     * DH加密下需要一种对称加密算法对数据加密，这里我们使用DES，也可以使用其他对称加密算法。
     */
    private static final String SECRET_ALGORITHM = "DES";

    /**
     * DH公钥
     */
    private static final String DHPUBLIC_KEY = "DHPublicKey";

    /**
     * DH私钥
     */
    private static final String DHPRIVATE_KEY = "DHPrivateKey";

    /**
     * Java密钥库(Java Key Store，JKS)KEY_STORE
     */
    private static final String KEY_STORE = "JKS";

    private static final String X509 = "X.509";

    /**
     * 信息摘要算法
     * @param algorithm 算法类型
     * @param data 要加密的字符串
     * @return 返回加密后的摘要信息
     */
    private static String encryptEncode(String algorithm, String data) {
        try {
            MessageDigest md = MessageDigest.getInstance(algorithm);
            return TranscodeUtil.byteArrayToHexStr(md.digest(data.getBytes()));
        } catch(NoSuchAlgorithmException ex) {
            ex.printStackTrace();
        }
        return null;
    }

    /**
     * 使用MD5加密
     * @param data 要加密的字符串
     * @return 返回加密后的信息
     */
    public static String MD5Encode(String data) {
        return encryptEncode(ALGORITHM_MD5, data);
    }

    /**
     * 使用SHA加密
     * @param data 要加密的字符串
     * @return 返回加密后的信息
     */
    public static String SHAEncode(String data) {
        return encryptEncode(ALGORITHM_SHA, data);
    }

    /**
     * 生成HMAC密钥
     * @return 返回密钥信息
     */
    public static String generateMACKey() {
        try {
            KeyGenerator keyGenerator = KeyGenerator.getInstance(ALGORITHM_MAC);
            SecretKey secretKey = keyGenerator.generateKey();
            return TranscodeUtil.byteArrayToBase64Str(secretKey.getEncoded());
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 使用HMAC加密
     * @param data 要加密的字符串
     * @param key 密钥
     * @return 返回加密后的信息
     */
    public static String HMACEncode(String data, String key) {
        Key k = toKey(key,ALGORITHM_MAC);
        try {
            Mac mac = Mac.getInstance(k.getAlgorithm());
            mac.init(k);
            return TranscodeUtil.byteArrayToBase64Str(mac.doFinal(data.getBytes()));
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 将base64编码后的密钥字符串转换成密钥对象
     * @param key 密钥字符串
     * @param algorithm 加密算法
     * @return 返回密钥对象
     */
    private static Key toKey(String key,String algorithm) {
        SecretKey secretKey = new SecretKeySpec(TranscodeUtil.base64StrToByteArray(key), algorithm);
        return secretKey;
    }

    /**
     * 生成DES密钥
     * @param seed 密钥种子
     * @return 返回base64编码的密钥字符串
     */
    public static String generateDESKey(String seed) {
        try {
            KeyGenerator kg = KeyGenerator.getInstance(ALGORITHM_DES);
            kg.init(new SecureRandom(seed.getBytes()));
            SecretKey secretKey = kg.generateKey();
            return TranscodeUtil.byteArrayToBase64Str(secretKey.getEncoded());
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * DES加密
     * @param data 要加密的数据
     * @param key 密钥
     * @return 返回加密后的数据(经过base64编码)
     */
    public static String DESEncrypt(String data,String key) {
        return DESCipher(data,key,Cipher.ENCRYPT_MODE);
    }

    /**
     * DES解密
     * @param data 要解密的数据
     * @param key 密钥
     * @return 返回解密后的数据
     */
    public static String DESDecrypt(String data, String key) {
        return DESCipher(data,key,Cipher.DECRYPT_MODE);
    }

    /**
     * DES的加密解密
     * @param data 要加密或解密的数据
     * @param key 密钥
     * @param mode 加密或解密模式
     * @return 返回加密或解密的数据
     */
    private static String DESCipher(String data, String key, int mode) {
        try {
            Key k = toKey(key,ALGORITHM_DES);
            Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
            cipher.init(mode, k);
            return mode == Cipher.DECRYPT_MODE?new String(cipher.doFinal(TranscodeUtil.base64StrToByteArray(data))):TranscodeUtil.byteArrayToBase64Str(cipher.doFinal(data.getBytes()));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 生成盐
     * @return 返回base64编码后的盐信息
     */
    public static String generatePBESalt() {
        byte[] salt = new byte[8];
        Random random = new Random();
        random.nextBytes(salt);
        return TranscodeUtil.byteArrayToBase64Str(salt);
    }

    /**
     * PBE(Password-based encryption基于密码加密)加密
     * @param data 要加密的数据
     * @param password 密码
     * @param salt 盐
     * @return 返回加密后的数据(经过base64编码)
     */
    public static String PBEEncrypt(String data,String password,String salt) {
        return PBECipher( data, password, salt, Cipher.ENCRYPT_MODE);
    }

    /**
     * PBE(Password-based encryption基于密码加密)解密
     * @param data 要解密的数据
     * @param password 密码
     * @param salt 盐
     * @return 返回解密后的数据
     */
    public static String PBEDecrypt(String data,String password,String salt) {
        return PBECipher( data, password, salt, Cipher.DECRYPT_MODE);
    }

    /**
     * PBE加密解密
     * @param data 要加密解密的信息
     * @param password 密码
     * @param salt 盐
     * @param mode 加密或解密模式
     * @return 返回加密解密后的数据
     */
    private static String PBECipher(String data,String password,String salt,int mode) {
        try {
            Key secretKey = toPBEKey(password);
            PBEParameterSpec paramSpec = new PBEParameterSpec(TranscodeUtil.base64StrToByteArray(salt), 100);
            Cipher cipher = Cipher.getInstance(ALGORITHM_PBE);
            cipher.init(mode, secretKey, paramSpec);
            return mode == Cipher.DECRYPT_MODE?new String(cipher.doFinal(TranscodeUtil.base64StrToByteArray(data))):TranscodeUtil.byteArrayToBase64Str(cipher.doFinal(data.getBytes()));
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (InvalidAlgorithmParameterException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 生成PBEkey
     * @param password 使用的密码
     * @return 返回生成的PBEkey
     */
    private static Key toPBEKey(String password) {
        PBEKeySpec keySpec = new PBEKeySpec(password.toCharArray());
        try {
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(ALGORITHM_PBE);
            SecretKey secretKey = keyFactory.generateSecret(keySpec);
            return secretKey;
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (InvalidKeySpecException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 生成AESkey
     * @param keySize key的位数
     * @param seed 随机种子
     * @return 返回base64编码后的key信息
     */
    public static String generateAESKey(int keySize,String seed) {
        try {
            KeyGenerator kgen = KeyGenerator.getInstance(KEY_AES);
            kgen.init(keySize,new SecureRandom(seed.getBytes()));
            SecretKey key = kgen.generateKey();
            return TranscodeUtil.byteArrayToBase64Str(key.getEncoded());
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * AES加密
     * @param data 要加密的数据
     * @param key 密钥
     * @param algorithmParameter 算法参数
     * @return 返回加密数据
     */
    public static String AESEncrypt(String data,String key,String algorithmParameter) {
        return AESCipher(data, key, algorithmParameter,Cipher.ENCRYPT_MODE);
    }

    /**
     * AES解密
     * @param data 要解密的数据
     * @param key 密钥
     * @param algorithmParameter 算法参数
     * @return 返回解密数据
     */
    public static String AESDecrypt(String data,String key,String algorithmParameter) {
        return AESCipher(data, key, algorithmParameter,Cipher.DECRYPT_MODE);
    }

    /**
     * 实现AES加密解密
     * @param data 要加密或解密的数据
     * @param key 密钥
     * @param algorithmParameter 算法参数
     * @param mode 加密或解密
     * @return 返回加密或解密的数据
     */
    private static String AESCipher(String data, String key, String algorithmParameter,int mode) {
        try {
            Key k = toKey(key,KEY_AES);
            AlgorithmParameterSpec paramSpec = new IvParameterSpec(algorithmParameter.getBytes());
            Cipher ecipher = Cipher.getInstance(ALGORITHM_AES);
            ecipher.init(mode, k, paramSpec);
            return mode==Cipher.DECRYPT_MODE?new String(ecipher.doFinal(TranscodeUtil.base64StrToByteArray(data))):TranscodeUtil.byteArrayToBase64Str(ecipher.doFinal(data.getBytes()));
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (InvalidAlgorithmParameterException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 数字签名
     * @param data 要签名的密文
     * @param privateKey 私钥
     * @return 返回签名信息
     */
    public static String RSASign(String data, String privateKey) {
        try {
            // 解密由base64编码的私钥
            byte[] keyBytes = TranscodeUtil.base64StrToByteArray(privateKey);
            // 构造PKCS8EncodedKeySpec对象
            PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
            // KEY_ALGORITHM 指定的加密算法
            KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
            // 取私钥匙对象
            PrivateKey priKey = keyFactory.generatePrivate(pkcs8KeySpec);
            // 用私钥对信息生成数字签名
            Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
            signature.initSign(priKey);
            signature.update(TranscodeUtil.base64StrToByteArray(data));
            return TranscodeUtil.byteArrayToBase64Str(signature.sign());
        } catch(NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (InvalidKeySpecException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (SignatureException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 验证签名
     * @param data 要验证的密文
     * @param publicKey 公钥
     * @param sign 签名信息
     * @return 返回验证成功状态
     */
    public static boolean RSAVerify(String data, String publicKey, String sign) {
        try {
            // 解密由base64编码的公钥
            byte[] keyBytes = TranscodeUtil.base64StrToByteArray(publicKey);
            // 构造X509EncodedKeySpec对象
            X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
            // KEY_ALGORITHM 指定的加密算法
            Signature signature;
            KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
            // 取公钥匙对象
            PublicKey pubKey = keyFactory.generatePublic(keySpec);
            signature = Signature.getInstance(SIGNATURE_ALGORITHM);
            signature.initVerify(pubKey);
            signature.update(TranscodeUtil.base64StrToByteArray(data));
            // 验证签名是否正常
            return signature.verify(TranscodeUtil.base64StrToByteArray(sign));
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (InvalidKeySpecException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (SignatureException e) {
            e.printStackTrace();
        }
        return false;
    }

    /**
     * 私钥解密
     * @param data 要解密的字符串
     * @param key 私钥
     * @return 返回解密后的字符串
     */
    public static String RSADecryptByPrivateKey(String data, String key) {
        try {
            // 对密钥解密
            byte[] keyBytes = TranscodeUtil.base64StrToByteArray(key);
            // 取得私钥
            PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
            KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
            Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
            // 对数据解密
            Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
            cipher.init(Cipher.DECRYPT_MODE, privateKey);
            return new String(cipher.doFinal(TranscodeUtil.base64StrToByteArray(data)));
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (InvalidKeySpecException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 公钥解密
     * @param data 要解密的数据
     * @param key 公钥
     * @return 返回解密后的数据
     */
    public static String RSADecryptByPublicKey(String data, String key) {
        try {
            // 对密钥解密
            byte[] keyBytes = TranscodeUtil.base64StrToByteArray(key);
            // 取得公钥
            X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
            KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
            Key publicKey = keyFactory.generatePublic(x509KeySpec);
            // 对数据解密
            Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
            cipher.init(Cipher.DECRYPT_MODE, publicKey);
            return new String(cipher.doFinal(TranscodeUtil.base64StrToByteArray(data)));
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        } catch (InvalidKeySpecException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 公钥加密
     * @param data 要加密的数据
     * @param key 公钥
     * @return 返回加密的数据
     */
    public static String RSAEncryptByPublicKey(String data, String key) {
        try {
            // 对公钥解密
            byte[] keyBytes = TranscodeUtil.base64StrToByteArray(key);
            // 取得公钥
            X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
            KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
            Key publicKey = keyFactory.generatePublic(x509KeySpec);
            // 对数据加密
            Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
            cipher.init(Cipher.ENCRYPT_MODE, publicKey);
            return TranscodeUtil.byteArrayToBase64Str(cipher.doFinal(data.getBytes()));
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (InvalidKeySpecException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 私钥加密
     * @param data 要加密的数据
     * @param key 私钥
     * @return 返回加密后的数据
     */
    public static String RSAEncryptByPrivateKey(String data, String key) {
        try {
            // 对密钥解密
            byte[] keyBytes = TranscodeUtil.base64StrToByteArray(key);
            // 取得私钥
            PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
            KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
            Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
            // 对数据加密
            Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
            cipher.init(Cipher.ENCRYPT_MODE, privateKey);
            return TranscodeUtil.byteArrayToBase64Str(cipher.doFinal(data.getBytes()));
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (InvalidKeySpecException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 获得私钥
     * @param keyMap 密钥对
     * @return 返回经过base64编码的私钥
     */
    public static String getRSAPrivateKey(Map<String, Object> keyMap) {
        Key key = (Key) keyMap.get(RSAPRIVATE_KEY);
        return TranscodeUtil.byteArrayToBase64Str(key.getEncoded());
    }

    /**
     * 获得公钥(base64编码)
     * @param keyMap 密钥对
     * @return 返回经过base64编码的公钥
     */
    public static String getRSAPublicKey(Map<String, Object> keyMap) {
        Key key = (Key) keyMap.get(RSAPUBLIC_KEY);
        return TranscodeUtil.byteArrayToBase64Str(key.getEncoded());
    }

    /**
     * 初始化密钥对
     * @return 返回密钥对
     */
    public static Map<String, Object> initRSAKey() {
        Map<String, Object> keyMap = new HashMap<String, Object>(2);
        try {
            KeyPairGenerator keyPairGen = KeyPairGenerator
                                          .getInstance(KEY_ALGORITHM);
            keyPairGen.initialize(1024);
            KeyPair keyPair = keyPairGen.generateKeyPair();
            // 公钥
            RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
            // 私钥
            RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
            keyMap.put(RSAPUBLIC_KEY, publicKey);
            keyMap.put(RSAPRIVATE_KEY, privateKey);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return keyMap;
    }

    /**
     * 初始化甲方密钥对
     * @return 返回甲方密钥对
     */
    public static Map<String, Object> initDHKey() {
        try {
            KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(ALGORITHM_DH);
            keyPairGenerator.initialize(DH_KEY_SIZE);
            KeyPair keyPair = keyPairGenerator.generateKeyPair();
            // 甲方公钥
            DHPublicKey publicKey = (DHPublicKey) keyPair.getPublic();
            // 甲方私钥
            DHPrivateKey privateKey = (DHPrivateKey) keyPair.getPrivate();
            Map<String, Object> keyMap = new HashMap<String, Object>(2);
            keyMap.put(DHPUBLIC_KEY, publicKey);
            keyMap.put(DHPRIVATE_KEY, privateKey);
            return keyMap;
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 使用甲方公钥初始化乙方密钥对
     * @param key 甲方公钥
     * @return 返回乙方密钥对
     */
    public static Map<String, Object> initDHKey(String key) {
        try {
            // 解析甲方公钥
            byte[] keyBytes = TranscodeUtil.base64StrToByteArray(key);
            X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
            KeyFactory keyFactory = KeyFactory.getInstance(ALGORITHM_DH);
            PublicKey pubKey = keyFactory.generatePublic(x509KeySpec);
            // 由甲方公钥构建乙方密钥
            DHParameterSpec dhParamSpec = ((DHPublicKey) pubKey).getParams();
            KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(keyFactory.getAlgorithm());
            keyPairGenerator.initialize(dhParamSpec);
            KeyPair keyPair = keyPairGenerator.generateKeyPair();
            // 乙方公钥
            DHPublicKey publicKey = (DHPublicKey) keyPair.getPublic();
            // 乙方私钥
            DHPrivateKey privateKey = (DHPrivateKey) keyPair.getPrivate();
            Map<String, Object> keyMap = new HashMap<String, Object>(2);
            keyMap.put(DHPUBLIC_KEY, publicKey);
            keyMap.put(DHPRIVATE_KEY, privateKey);
            return keyMap;
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (InvalidKeySpecException e) {
            e.printStackTrace();
        } catch (InvalidAlgorithmParameterException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * DH加密
     * @param data 要加密的数据
     * @param publicKey 甲方或乙方公钥
     * @param privateKey 甲方或乙方私钥
     * @return 加密结果
     */
    public static String DHEncrypt(String data, String publicKey,String privateKey) {
        try {
            // 生成本地密钥
            SecretKey secretKey = getDHSecretKey(publicKey, privateKey);
            // 数据加密
            Cipher cipher = Cipher.getInstance(secretKey.getAlgorithm());
            cipher.init(Cipher.ENCRYPT_MODE, secretKey);
            return TranscodeUtil.byteArrayToBase64Str(cipher.doFinal(data.getBytes()));
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * DH解密
     * @param data 要解密的数据
     * @param publicKey 公钥
     * @param privateKey 私钥
     * @return 返回解密结果
     */
    public static String DHDecrypt(String data, String publicKey,String privateKey) {
        try {
            // 生成本地密钥
            SecretKey secretKey = getDHSecretKey(publicKey, privateKey);
            // 数据解密
            Cipher cipher = Cipher.getInstance(secretKey.getAlgorithm());
            cipher.init(Cipher.DECRYPT_MODE, secretKey);
            return new String(cipher.doFinal(TranscodeUtil.base64StrToByteArray(data)));
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 生成本地密钥
     * @param publicKey 公钥
     * @param privateKey 私钥
     * @return 返回本地密钥
     */
    private static SecretKey getDHSecretKey(String publicKey, String privateKey) {
        try {
            // 初始化公钥
            byte[] pubKeyBytes = TranscodeUtil.base64StrToByteArray(publicKey);
            KeyFactory keyFactory = KeyFactory.getInstance(ALGORITHM_DH);
            X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(pubKeyBytes);
            PublicKey pubKey = keyFactory.generatePublic(x509KeySpec);
            // 初始化私钥
            byte[] priKeyBytes = TranscodeUtil.base64StrToByteArray(privateKey);
            PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(priKeyBytes);
            Key priKey = keyFactory.generatePrivate(pkcs8KeySpec);
            KeyAgreement keyAgree = KeyAgreement.getInstance(keyFactory.getAlgorithm());
            keyAgree.init(priKey);
            keyAgree.doPhase(pubKey, true);
            // 生成本地密钥
            SecretKey secretKey = keyAgree.generateSecret(SECRET_ALGORITHM);
            return secretKey;
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (InvalidKeySpecException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 获取私钥
     * @param keyMap 密钥对
     * @return 返回base64编码的私钥
     */
    public static String getDHPrivateKey(Map<String, Object> keyMap) {
        Key key = (Key) keyMap.get(DHPRIVATE_KEY);
        return TranscodeUtil.byteArrayToBase64Str(key.getEncoded());
    }

    /**
     * 获取公钥
     * @param keyMap 密钥对
     * @return 返回base64编码的公钥
     */
    public static String getDHPublicKey(Map<String, Object> keyMap) {
        Key key = (Key) keyMap.get(DHPUBLIC_KEY);
        return TranscodeUtil.byteArrayToBase64Str(key.getEncoded());
    }

    /**
     * 获取私钥
     * @param keyStorePath keystore文件路径
     * @param alias 别名
     * @param password 密码
     * @return 返回私钥
     */
    private static PrivateKey getKeyStorePrivateKey(String keyStorePath, String alias,String password) {
        try {
            KeyStore ks = getKeyStore(keyStorePath, password);
            PrivateKey key = (PrivateKey) ks.getKey(alias, password.toCharArray());
            return key;
        } catch (UnrecoverableKeyException e) {
            e.printStackTrace();
        } catch (KeyStoreException e) {
            e.printStackTrace();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 获取公钥
     * @param certificatePath 证书文件路径
     * @return 返回公钥
     */
    private static PublicKey getCertificatePublicKey(String certificatePath) {
        try {
            Certificate certificate = getCertificate(certificatePath);
            PublicKey key = certificate.getPublicKey();
            return key;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 加载证书文件
     * @param certificatePath 证书文件路径
     * @return 返回证书
     */
    private static Certificate getCertificate(String certificatePath) {
        try {
            CertificateFactory certificateFactory = CertificateFactory.getInstance(X509);
            FileInputStream in = new FileInputStream(certificatePath);
            Certificate certificate = certificateFactory.generateCertificate(in);
            in.close();
            return certificate;
        } catch (CertificateException e) {
            e.printStackTrace();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 获取证书
     * @param keyStorePath keystore文件路径
     * @param alias 别名
     * @param password 密码
     * @return 返回证书
     */
    private static Certificate getCertificate(String keyStorePath,String alias, String password) {
        try {
            KeyStore ks = getKeyStore(keyStorePath, password);
            Certificate certificate = ks.getCertificate(alias);
            return certificate;
        } catch (KeyStoreException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 加载KeyStore文件
     * @param keyStorePath keystore文件地址
     * @param password keystore密码
     * @return 返回KeyStore
     */
    private static KeyStore getKeyStore(String keyStorePath, String password) {
        try {
            FileInputStream is = new FileInputStream(keyStorePath);
            KeyStore ks = KeyStore.getInstance(KEY_STORE);
            ks.load(is, password.toCharArray());
            is.close();
            return ks;
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (KeyStoreException e) {
            e.printStackTrace();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (CertificateException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 加密数据
     * @param data 要加密的数据
     * @param keyStorePath keystore路径
     * @param alias 别名
     * @param password 密码
     * @return 返回加密后的数据
     */
    public static String encryptByPrivateKey(String data, String keyStorePath,
            String alias, String password) {
        try {
            // 取得私钥
            PrivateKey privateKey = getKeyStorePrivateKey(keyStorePath, alias, password);
            // 对数据加密
            Cipher cipher = Cipher.getInstance(privateKey.getAlgorithm());
            cipher.init(Cipher.ENCRYPT_MODE, privateKey);
            return TranscodeUtil.byteArrayToBase64Str(cipher.doFinal(data.getBytes()));
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 私钥解密
     * @param data 要解密的数据
     * @param keyStorePath keystore路径
     * @param alias 别名
     * @param password 密码
     * @return 返回解密后的数据
     */
    public static String decryptByPrivateKey(String data, String keyStorePath,String alias, String password) {
        try {
            // 取得私钥
            PrivateKey privateKey = getKeyStorePrivateKey(keyStorePath, alias, password);
            // 对数据加密
            Cipher cipher = Cipher.getInstance(privateKey.getAlgorithm());
            cipher.init(Cipher.DECRYPT_MODE, privateKey);
            return new String(cipher.doFinal(TranscodeUtil.base64StrToByteArray(data)));
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 私钥加密
     * @param data 要加密的数据
     * @param certificatePath 证书路径
     * @return 返回加密后的信息
     */
    public static String encryptByPublicKey(String data, String certificatePath) {
        try {
            // 取得公钥
            PublicKey publicKey = getCertificatePublicKey(certificatePath);
            // 对数据加密
            Cipher cipher = Cipher.getInstance(publicKey.getAlgorithm());
            cipher.init(Cipher.ENCRYPT_MODE, publicKey);
            return TranscodeUtil.byteArrayToBase64Str(cipher.doFinal(data.getBytes()));
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 公钥解密
     * @param data 要解密的数据
     * @param certificatePath 证书路径
     * @return 返回解密信息
     */
    public static String decryptByPublicKey(String data, String certificatePath) {
        try {
            // 取得公钥
            PublicKey publicKey = getCertificatePublicKey(certificatePath);
            // 对数据加密
            Cipher cipher = Cipher.getInstance(publicKey.getAlgorithm());
            cipher.init(Cipher.DECRYPT_MODE, publicKey);
            return new String(cipher.doFinal(TranscodeUtil.base64StrToByteArray(data)));
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 验证证书是否过期
     * @param certificatePath 证书路径
     * @return 返回验证结果
     */
    public static boolean verifyCertificate(String certificatePath) {
        return verifyCertificate(new Date(), certificatePath);
    }

    /**
     * 验证证书是否过期
     * @param date 日期
     * @param certificatePath 证书路径
     * @return 返回验证结果
     */
    public static boolean verifyCertificate(Date date, String certificatePath) {
        boolean status = true;
        try {
            // 取得证书
            Certificate certificate = getCertificate(certificatePath);
            // 验证证书是否过期或无效
            status = verifyCertificate(date, certificate);
        } catch (Exception e) {
            status = false;
        }
        return status;
    }

    /**
     * 验证证书是否过期
     * @param date 日期
     * @param certificate 证书
     * @return 返回验证结果
     */
    private static boolean verifyCertificate(Date date, Certificate certificate) {
        boolean status = true;
        try {
            X509Certificate x509Certificate = (X509Certificate) certificate;
            x509Certificate.checkValidity(date);
        } catch (Exception e) {
            status = false;
        }
        return status;
    }

    /**
     * 对于数据进行签名
     * @param sign 要签名的信息
     * @param keyStorePath keystore文件位置
     * @param alias 别名
     * @param password 密码
     * @return 返回签名信息
     */
    public static String sign(String sign, String keyStorePath, String alias,String password) {
        try {
            // 获得证书
            X509Certificate x509Certificate = (X509Certificate) getCertificate(
                                                  keyStorePath, alias, password);
            // 获取私钥
            KeyStore ks = getKeyStore(keyStorePath, password);
            // 取得私钥
            PrivateKey privateKey = (PrivateKey) ks.getKey(alias, password
                                    .toCharArray());
            // 构建签名
            Signature signature = Signature.getInstance(x509Certificate
                                  .getSigAlgName());
            signature.initSign(privateKey);
            signature.update(TranscodeUtil.base64StrToByteArray(sign));
            return TranscodeUtil.byteArrayToBase64Str(signature.sign());
        } catch (UnrecoverableKeyException e) {
            e.printStackTrace();
        } catch (KeyStoreException e) {
            e.printStackTrace();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (SignatureException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 验证签名信息
     * @param data 要验证的信息
     * @param sign 签名信息
     * @param certificatePath 证书路径
     * @return 返回验证结果
     */
    public static boolean verify(String data, String sign,String certificatePath) {
        try {
            // 获得证书
            X509Certificate x509Certificate = (X509Certificate) getCertificate(certificatePath);
            // 获得公钥
            PublicKey publicKey = x509Certificate.getPublicKey();
            // 构建签名
            Signature signature = Signature.getInstance(x509Certificate
                                  .getSigAlgName());
            signature.initVerify(publicKey);
            signature.update(TranscodeUtil.base64StrToByteArray(data));
            return signature.verify(TranscodeUtil.base64StrToByteArray(sign));
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (SignatureException e) {
            e.printStackTrace();
        }
        return false;
    }

    /**
     * 验证证书
     * @param date 日期
     * @param keyStorePath keystore文件路径
     * @param alias 别名
     * @param password 密码
     * @return 返回验证结果
     */
    public static boolean verifyCertificate(Date date, String keyStorePath,
                                            String alias, String password) {
        boolean status = true;
        try {
            Certificate certificate = getCertificate(keyStorePath, alias,
                                      password);
            status = verifyCertificate(date, certificate);
        } catch (Exception e) {
            status = false;
        }
        return status;
    }

    /**
     * 验证证书
     * @param keyStorePath keystore文件路径
     * @param alias 别名
     * @param password 密码
     * @return 返回验证结果
     */
    public static boolean verifyCertificate(String keyStorePath, String alias,
                                            String password) {
        return verifyCertificate(new Date(), keyStorePath, alias, password);
    }

}