Java笔记-DH密钥交换获取密钥及AES加解密

DH密钥交换是这样的：

程序运行截图如下：

D:\java8\content\bin\java.exe -javaagent:D:\idea\content\lib\idea_rt.jar=61009:D:\idea\content\bin -Dfile.encoding=UTF-8 -classpath D:\java8\content\jre\lib\charsets.jar;D:\java8\content\jre\lib\deploy.jar;D:\java8\content\jre\lib\ext\access-bridge-64.jar;D:\java8\content\jre\lib\ext\cldrdata.jar;D:\java8\content\jre\lib\ext\dnsns.jar;D:\java8\content\jre\lib\ext\jaccess.jar;D:\java8\content\jre\lib\ext\jfxrt.jar;D:\java8\content\jre\lib\ext\localedata.jar;D:\java8\content\jre\lib\ext\nashorn.jar;D:\java8\content\jre\lib\ext\sunec.jar;D:\java8\content\jre\lib\ext\sunjce_provider.jar;D:\java8\content\jre\lib\ext\sunmscapi.jar;D:\java8\content\jre\lib\ext\sunpkcs11.jar;D:\java8\content\jre\lib\ext\zipfs.jar;D:\java8\content\jre\lib\javaws.jar;D:\java8\content\jre\lib\jce.jar;D:\java8\content\jre\lib\jfr.jar;D:\java8\content\jre\lib\jfxswt.jar;D:\java8\content\jre\lib\jsse.jar;D:\java8\content\jre\lib\management-agent.jar;D:\java8\content\jre\lib\plugin.jar;D:\java8\content\jre\lib\resources.jar;D:\java8\content\jre\lib\rt.jar;D:\IDEAProject\DHDemo\target\classes;D:\newGenRepository\repository\commons-codec\commons-codec\1.11\commons-codec-1.11.jar cn.it1995.Test
服务端公钥:MIHgMIGXBgkqhkiG9w0BAwEwgYkCQQD8poLOjhLKuibvzPcRDlJtsHiwXt7LzR60ogjzrhYXrgHzW5Gkfm32NBPF4S7QiZvNEyrNUNmRUb3EPuc3WS4XAkBnhHGyepz0TukaScUUfbGpqvJE8FpDTWSGkx0tFCcbnjUDC3H9c9oXkGmzLik1Yw4cIGI1TQ2iCmxBblC+eUykAgIBgANEAAJBAKvnBpIb+eOiVyKDGkTsSc+8lOlgMdu6hEumGfdl6+yOyu3+Rlw9PwbiJ1Fd7qDD/vpI5+nktCA3C5FstsCF/ZM=
服务端私钥:MIHSAgEAMIGXBgkqhkiG9w0BAwEwgYkCQQD8poLOjhLKuibvzPcRDlJtsHiwXt7LzR60ogjzrhYXrgHzW5Gkfm32NBPF4S7QiZvNEyrNUNmRUb3EPuc3WS4XAkBnhHGyepz0TukaScUUfbGpqvJE8FpDTWSGkx0tFCcbnjUDC3H9c9oXkGmzLik1Yw4cIGI1TQ2iCmxBblC+eUykAgIBgAQzAjEA1JWmuoylaemaZlWJTPz887uUitPZdphkrhv79XsIlHBLjmFB6dFQLJ/6TLaQGNLz
客户端公钥:MIHgMIGXBgkqhkiG9w0BAwEwgYkCQQD8poLOjhLKuibvzPcRDlJtsHiwXt7LzR60ogjzrhYXrgHzW5Gkfm32NBPF4S7QiZvNEyrNUNmRUb3EPuc3WS4XAkBnhHGyepz0TukaScUUfbGpqvJE8FpDTWSGkx0tFCcbnjUDC3H9c9oXkGmzLik1Yw4cIGI1TQ2iCmxBblC+eUykAgIBgANEAAJBAOhfxWPk/NI4wAWhaM14wJVgdUObef9J2kAzRy5yyi5QfrSabMpQh64oE72KzKMjMhgvPfqYSw5NYFu8V8EMW20=
客户端私钥:MIHSAgEAMIGXBgkqhkiG9w0BAwEwgYkCQQD8poLOjhLKuibvzPcRDlJtsHiwXt7LzR60ogjzrhYXrgHzW5Gkfm32NBPF4S7QiZvNEyrNUNmRUb3EPuc3WS4XAkBnhHGyepz0TukaScUUfbGpqvJE8FpDTWSGkx0tFCcbnjUDC3H9c9oXkGmzLik1Yw4cIGI1TQ2iCmxBblC+eUykAgIBgAQzAjEAtjb/+dXXhPMI3xubgp3LipUgNYjMtWok30cn3KxGgkspHEqI35h+TLRmT2CZDopA
客户端计算出的AES密钥:g/tQbIkTCH3I1gXCVNObyyHKsBkWXTsNJIiPG3gVJII=
服务端计算出的AES密钥:g/tQbIkTCH3I1gXCVNObyyHKsBkWXTsNJIiPG3gVJII=
原文:Hello world, 中文
密文:���-�5�5�u�ɫ5>#�Ij>�/hC�
解密:Hello world, 中文Process finished with exit code 0

程序结构如下：

代码如下：

DataSecret.java

package cn.it1995;import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;public class DataSecret {private static final String SELECT_ALGORITHM = "AES";   //DES、DESede或者AESpublic static byte[] encrypt(byte[] data, byte[] key) throws Exception {//生成本地密钥SecretKey secretKey = new SecretKeySpec(key, SELECT_ALGORITHM);//加密Cipher cipher = Cipher.getInstance(secretKey.getAlgorithm());cipher.init(Cipher.ENCRYPT_MODE, secretKey);return cipher.doFinal(data);}public static byte[] decrypt(byte[] data, byte[] key) throws Exception {SecretKey secretKey = new SecretKeySpec(key, SELECT_ALGORITHM);Cipher cipher = Cipher.getInstance(secretKey.getAlgorithm());cipher.init(Cipher.DECRYPT_MODE, secretKey);return cipher.doFinal(data);}
}

DH.java

package cn.it1995;import javax.crypto.KeyAgreement;
import javax.crypto.SecretKey;
import javax.crypto.interfaces.DHPrivateKey;
import javax.crypto.interfaces.DHPublicKey;
import java.security.*;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.HashMap;
import java.util.Map;public abstract class DH {private static final String KEY_ALGORITHM = "DH";private static final int KEY_SIZE = 512;private static final String PUBLIC_KEY = "DHPublicKey";private static final String PRIVATE_KEY = "DHPrivateKey";private static final String SELECT_ALGORITHM = "AES";   //DES、DESede或者AES/**** 初始化服务端密钥* @return* @throws Exception*/public static Map<String, Object> initKey() throws Exception {KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(KEY_ALGORITHM);keyPairGenerator.initialize(KEY_SIZE);KeyPair keyPair = keyPairGenerator.generateKeyPair();DHPublicKey publicKey = (DHPublicKey)keyPair.getPublic();DHPrivateKey privateKey = (DHPrivateKey)keyPair.getPrivate();Map<String, Object> keyMap = new HashMap<>();keyMap.put(PUBLIC_KEY, publicKey);keyMap.put(PRIVATE_KEY, privateKey);return keyMap;}public static byte[] getSecretKey(byte[] publicKey, byte[] privateKey) throws Exception {KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(publicKey);PublicKey pubKey = keyFactory.generatePublic(x509KeySpec);PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(privateKey);PrivateKey priKey = keyFactory.generatePrivate(pkcs8KeySpec);KeyAgreement keyAgree = KeyAgreement.getInstance(keyFactory.getAlgorithm());keyAgree.init(priKey);keyAgree.doPhase(pubKey, true);SecretKey secretKey = keyAgree.generateSecret(SELECT_ALGORITHM);return secretKey.getEncoded();}public static byte[] getPublicKey(Map<String, Object> keyMap){Key key = (Key) keyMap.get(PUBLIC_KEY);return key.getEncoded();}public static byte[] getPrivateKey(Map<String, Object> keyMap){Key key = (Key) keyMap.get(PRIVATE_KEY);return key.getEncoded();}}

Test.java

package cn.it1995;import org.apache.commons.codec.binary.Base64;import java.util.Map;public class Test {private static byte[] publicKey1;private static byte[] privateKey1;private static byte[] key1;private static byte[] publicKey2;private static byte[] privateKey2;private static byte[] key2;public static void main(String[] args) throws Exception {System.getProperties().setProperty("jdk.crypto.KeyAgreement.legacyKDF", "true");//服务端密钥Map<String, Object> keyMap1 = DH.initKey();publicKey1 = DH.getPublicKey(keyMap1);privateKey1 = DH.getPrivateKey(keyMap1);System.out.println("服务端公钥:" + Base64.encodeBase64String(publicKey1));System.out.println("服务端私钥:" + Base64.encodeBase64String(privateKey1));//客户端密钥Map<String, Object> keyMap2 = DH.initKey();publicKey2 = DH.getPublicKey(keyMap2);privateKey2 = DH.getPrivateKey(keyMap2);System.out.println("客户端公钥:" + Base64.encodeBase64String(publicKey2));System.out.println("客户端私钥:" + Base64.encodeBase64String(privateKey2));//服务端公钥和客户端私钥生成密钥key1 = DH.getSecretKey(publicKey1, privateKey2);System.out.println("客户端计算出的AES密钥:" + Base64.encodeBase64String(key1));//客户端公钥和服务端私钥生成密钥key2 = DH.getSecretKey(publicKey2, privateKey1);System.out.println("服务端计算出的AES密钥:" + Base64.encodeBase64String(key2));//开始进行加密String string = "Hello world, 中文";byte[] encrypt = DataSecret.encrypt(string.getBytes(), key1);byte[] decrypt = DataSecret.decrypt(encrypt, key2);System.out.println("原文:" + string);System.out.println("密文:" + new String(encrypt));System.out.println("解密:" + new String(decrypt));}
}

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