Java加密技术（五）——非对称加密算法的由来DH

接下来我们分析DH加密算法，一种适基于密钥一致协议的加密算法。

DH

Diffie-Hellman算法(D-H算法)，密钥一致协议。是由公开密钥密码体制的奠基人Diffie和Hellman所提出的一种思想。简单的说就是允许两名用户在公开媒体上交换信息以生成"一致"的、可以共享的密钥。换句话说，就是由甲方产出一对密钥（公钥、私钥），乙方依照甲方公钥产生乙方密钥对（公钥、私钥）。以此为基线，作为数据传输保密基础，同时双方使用同一种对称加密算法构建本地密钥（SecretKey）对数据加密。这样，在互通了本地密钥（SecretKey）算法后，甲乙双方公开自己的公钥，使用对方的公钥和刚才产生的私钥加密数据，同时可以使用对方的公钥和自己的私钥对数据解密。不单单是甲乙双方两方，可以扩展为多方共享数据通讯，这样就完成了网络交互数据的安全通讯！该算法源于中国的同余定理——中国馀数定理。


流程分析：

1.甲方构建密钥对儿，将公钥公布给乙方，将私钥保留；双方约定数据加密算法；乙方通过甲方公钥构建密钥对儿，将公钥公布给甲方，将私钥保留。

2.甲方使用私钥、乙方公钥、约定数据加密算法构建本地密钥，然后通过本地密钥加密数据，发送给乙方加密后的数据；乙方使用私钥、甲方公钥、约定数据加密算法构建本地密钥，然后通过本地密钥对数据解密。

3.乙方使用私钥、甲方公钥、约定数据加密算法构建本地密钥，然后通过本地密钥加密数据，发送给甲方加密后的数据；甲方使用私钥、乙方公钥、约定数据加密算法构建本地密钥，然后通过本地密钥对数据解密。







通过java代码实现如下：Coder类见 Java加密技术（一）

Java代码


import java.security.Key;

import java.security.KeyFactory;

import java.security.KeyPair;

import java.security.KeyPairGenerator;

import java.security.PublicKey;

import java.security.spec.PKCS8EncodedKeySpec;

import java.security.spec.X509EncodedKeySpec;

import java.util.HashMap;

import java.util.Map;

import javax.crypto.Cipher;

import javax.crypto.KeyAgreement;

import javax.crypto.SecretKey;

import javax.crypto.interfaces.DHPrivateKey;

import javax.crypto.interfaces.DHPublicKey;

import javax.crypto.spec.DHParameterSpec;

/**

* DH安全编码组件

*

* @author 梁栋

* @version 1.0

* @since 1.0

*/

public abstract class DHCoder extends Coder {

public static final String ALGORITHM = "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 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。

*/

public static final String SECRET_ALGORITHM = "DES";

private static final String PUBLIC_KEY = "DHPublicKey";

private static final String PRIVATE_KEY = "DHPrivateKey";

/**

* 初始化甲方密钥

*

* @return

* @throws Exception

*/

public static Map<String, Object> initKey() throws Exception {

KeyPairGenerator keyPairGenerator = KeyPairGenerator

.getInstance(ALGORITHM);

keyPairGenerator.initialize(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(PUBLIC_KEY, publicKey);

keyMap.put(PRIVATE_KEY, privateKey);

return keyMap;

}

/**

* 初始化乙方密钥

*

* @param key

* 甲方公钥

* @return

* @throws Exception

*/

public static Map<String, Object> initKey(String key) throws Exception {

// 解析甲方公钥

byte[] keyBytes = decryptBASE64(key);

X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);

KeyFactory keyFactory = KeyFactory.getInstance(ALGORITHM);

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(PUBLIC_KEY, publicKey);

keyMap.put(PRIVATE_KEY, privateKey);

return keyMap;

}

/**

* 加密<br>

*

* @param data

* 待加密数据

* @param publicKey

* 甲方公钥

* @param privateKey

* 乙方私钥

* @return

* @throws Exception

*/

public static byte[] encrypt(byte[] data, String publicKey,

String privateKey) throws Exception {

// 生成本地密钥

SecretKey secretKey = getSecretKey(publicKey, privateKey);

// 数据加密

Cipher cipher = Cipher.getInstance(secretKey.getAlgorithm());

cipher.init(Cipher.ENCRYPT_MODE, secretKey);

return cipher.doFinal(data);

}

/**

* 解密<br>

*

* @param data

* 待解密数据

* @param publicKey

* 乙方公钥

* @param privateKey

* 乙方私钥

* @return

* @throws Exception

*/

public static byte[] decrypt(byte[] data, String publicKey,

String privateKey) throws Exception {

// 生成本地密钥

SecretKey secretKey = getSecretKey(publicKey, privateKey);

// 数据解密

Cipher cipher = Cipher.getInstance(secretKey.getAlgorithm());

cipher.init(Cipher.DECRYPT_MODE, secretKey);

return cipher.doFinal(data);

}

/**

* 构建密钥

*

* @param publicKey

* 公钥

* @param privateKey

* 私钥

* @return

* @throws Exception

*/

private static SecretKey getSecretKey(String publicKey, String privateKey)

throws Exception {

// 初始化公钥

byte[] pubKeyBytes = decryptBASE64(publicKey);

KeyFactory keyFactory = KeyFactory.getInstance(ALGORITHM);

X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(pubKeyBytes);

PublicKey pubKey = keyFactory.generatePublic(x509KeySpec);

// 初始化私钥

byte[] priKeyBytes = decryptBASE64(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;

}

/**

* 取得私钥

*

* @param keyMap

* @return

* @throws Exception

*/

public static String getPrivateKey(Map<String, Object> keyMap)

throws Exception {

Key key = (Key) keyMap.get(PRIVATE_KEY);

return encryptBASE64(key.getEncoded());

}

/**

* 取得公钥

*

* @param keyMap

* @return

* @throws Exception

*/

public static String getPublicKey(Map<String, Object> keyMap)

throws Exception {

Key key = (Key) keyMap.get(PUBLIC_KEY);

return encryptBASE64(key.getEncoded());

}

}

再给出一个测试类：

Java代码


import static org.junit.Assert.*;

import java.util.Map;

import org.junit.Test;

/**

*

* @author 梁栋

* @version 1.0

* @since 1.0

*/

public class DHCoderTest {

@Test

public void test() throws Exception {

// 生成甲方密钥对儿

Map<String, Object> aKeyMap = DHCoder.initKey();

String aPublicKey = DHCoder.getPublicKey(aKeyMap);

String aPrivateKey = DHCoder.getPrivateKey(aKeyMap);

System.err.println("甲方公钥:\r" + aPublicKey);

System.err.println("甲方私钥:\r" + aPrivateKey);

// 由甲方公钥产生本地密钥对儿

Map<String, Object> bKeyMap = DHCoder.initKey(aPublicKey);

String bPublicKey = DHCoder.getPublicKey(bKeyMap);

String bPrivateKey = DHCoder.getPrivateKey(bKeyMap);

System.err.println("乙方公钥:\r" + bPublicKey);

System.err.println("乙方私钥:\r" + bPrivateKey);

String aInput = "abc ";

System.err.println("原文: " + aInput);

// 由甲方公钥，乙方私钥构建密文

byte[] aCode = DHCoder.encrypt(aInput.getBytes(), aPublicKey,

bPrivateKey);

// 由乙方公钥，甲方私钥解密

byte[] aDecode = DHCoder.decrypt(aCode, bPublicKey, aPrivateKey);

String aOutput = (new String(aDecode));

System.err.println("解密: " + aOutput);

assertEquals(aInput, aOutput);

System.err.println(" ===============反过来加密解密================== ");

String bInput = "def ";

System.err.println("原文: " + bInput);

// 由乙方公钥，甲方私钥构建密文

byte[] bCode = DHCoder.encrypt(bInput.getBytes(), bPublicKey,

aPrivateKey);

// 由甲方公钥，乙方私钥解密

byte[] bDecode = DHCoder.decrypt(bCode, aPublicKey, bPrivateKey);

String bOutput = (new String(bDecode));

System.err.println("解密: " + bOutput);

assertEquals(bInput, bOutput);

}

}

控制台输出：

Console代码


甲方公钥:

MIHfMIGXBgkqhkiG9w0BAwEwgYkCQQD8poLOjhLKuibvzPcRDlJtsHiwXt7LzR60ogjzrhYXrgHz

W5Gkfm32NBPF4S7QiZvNEyrNUNmRUb3EPuc3WS4XAkBnhHGyepz0TukaScUUfbGpqvJE8FpDTWSG

kx0tFCcbnjUDC3H9c9oXkGmzLik1Yw4cIGI1TQ2iCmxBblC+eUykAgIBgANDAAJAdAWBVmIzqcko

Ej6qFjLDL2+Y3FPq1iRbnOyOpDj71yKaK1K+FhTv04B0zy4DKcvAASV7/Gv0W+bgqdmffRkqrQ==

甲方私钥:

MIHRAgEAMIGXBgkqhkiG9w0BAwEwgYkCQQD8poLOjhLKuibvzPcRDlJtsHiwXt7LzR60ogjzrhYX

rgHzW5Gkfm32NBPF4S7QiZvNEyrNUNmRUb3EPuc3WS4XAkBnhHGyepz0TukaScUUfbGpqvJE8FpD

TWSGkx0tFCcbnjUDC3H9c9oXkGmzLik1Yw4cIGI1TQ2iCmxBblC+eUykAgIBgAQyAjACJRfy1LyR

eHyD+4Hfb+xR0uoIGR1oL9i9Nk6g2AAuaDPgEVWHn+QXID13yL/uDos=

乙方公钥:

MIHfMIGXBgkqhkiG9w0BAwEwgYkCQQD8poLOjhLKuibvzPcRDlJtsHiwXt7LzR60ogjzrhYXrgHz

W5Gkfm32NBPF4S7QiZvNEyrNUNmRUb3EPuc3WS4XAkBnhHGyepz0TukaScUUfbGpqvJE8FpDTWSG

kx0tFCcbnjUDC3H9c9oXkGmzLik1Yw4cIGI1TQ2iCmxBblC+eUykAgIBgANDAAJAVEYSfBA+I9nr

dWw3OBv475C+eBrWBBYqt0m6/eu4ptuDQHwV4MmUtKAC2wc2nNrdb1wmBhY1X8RnWkJ1XmdDbQ==

乙方私钥:

MIHSAgEAMIGXBgkqhkiG9w0BAwEwgYkCQQD8poLOjhLKuibvzPcRDlJtsHiwXt7LzR60ogjzrhYX

rgHzW5Gkfm32NBPF4S7QiZvNEyrNUNmRUb3EPuc3WS4XAkBnhHGyepz0TukaScUUfbGpqvJE8FpD

TWSGkx0tFCcbnjUDC3H9c9oXkGmzLik1Yw4cIGI1TQ2iCmxBblC+eUykAgIBgAQzAjEAqaZiCdXp

2iNpdBlHRaO9ir70wo2n32xNlIzIX19VLSPCDdeUWkgRv4CEj/8k+/yd

原文: abc

解密: abc

===============反过来加密解密==================

原文: def

解密: def

如我所言，甲乙双方在获得对方公钥后可以对发送给对方的数据加密，同时也能对接收到的数据解密，达到了数据安全通信的目的！