java 非对称加密算法DH实现详解
非对称加密算法是相对于对称加密算法来说的，对于对称加密算法请查阅之前的总结，今天为大家介绍一下DH算法，DH是一种密钥交换算法，接收方根据发送方加密时的密钥，生成接收方解密密钥。下面就一起来学习一下吧：
初始化发送方密钥：
KeyPairGeneratorsendKeyPairGenerator=KeyPairGenerator.getInstance("DH");
sendKeyPairGenerator.initialize(512);
KeyPairsendKeyPair=sendKeyPairGenerator.generateKeyPair();
byte[]sendPublicKeyEnc=sendKeyPair.getPublic().getEncoded();//生成发送方公钥，发送给接收方（网络、文件...）
初始化接收方密钥：
KeyFactoryreceiverKeyFactory=KeyFactory.getInstance("DH");
X509EncodedKeySpecx509EncodedKeySpec=newX509EncodedKeySpec(sendPublicKeyEnc);
PublicKeyreceivePublicKey=receiverKeyFactory.generatePublic(x509EncodedKeySpec);
DHParameterSpecdhParameterSpec=((DHPublicKey)receivePublicKey).getParams();
KeyPairGeneratorreceiverKeyPairGenerator=KeyPairGenerator.getInstance("DH");
receiverKeyPairGenerator.initialize(dhParameterSpec);
KeyPairreceiverKeyPair=receiverKeyPairGenerator.generateKeyPair();
PrivateKeyreceiverPrivateKey=receiverKeyPair.getPrivate();
byte[]receiverPublicKeyEnc=receiverKeyPair.getPublic().getEncoded();
构建接收方密钥：
KeyAgreementreceiverKeyAgreement=KeyAgreement.getInstance("DH");
receiverKeyAgreement.init(receiverPrivateKey);
receiverKeyAgreement.doPhase(receivePublicKey,true);
SecretKeyreceiverDESKey=receiverKeyAgreement.generateSecret("DES");//接收方Key
构建发送方密钥：
KeyFactorysendKeyFactory=KeyFactory.getInstance("DH");
x509EncodedKeySpec=newX509EncodedKeySpec(receiverPublicKeyEnc);
PublicKeysendPublicKey=sendKeyFactory.generatePublic(x509EncodedKeySpec);
KeyAgreementsendKeyAgreement=KeyAgreement.getInstance("DH");
sendKeyAgreement.init(sendKeyPair.getPrivate());
sendKeyAgreement.doPhase(sendPublicKey,true);
SecretKeysendDESKey=sendKeyAgreement.generateSecret("DES");//发送方Key
发送方加密：
CiphersendCipher=Cipher.getInstance("DES");
sendCipher.init(Cipher.ENCRYPT_MODE,sendDESKey);
byte[]sendResult=sendCipher.doFinal(src.getBytes());
System.out.println("sendResult："+Hex.encodeHexString(sendResult));
接收方解密：
CipherreceiverCipher=Cipher.getInstance("DES");
receiverCipher.init(Cipher.DECRYPT_MODE,receiverDESKey);
byte[]receiverResult=receiverCipher.doFinal(sendResult);
System.out.println("receiverResult:"+newString(receiverResult));
基于密钥交换的非对称加密算法（DH）,到这里就总结完毕了。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。
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