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java 非對稱加密算法DH實現(xiàn)詳解

更新時間：2019年07月27日 16:16:22 作者：小破孩123

這篇文章主要介紹了java 非對稱加密算法DH實現(xiàn)詳解 ,文中通過示例代碼介紹的非常詳細(xì)，對大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價值,需要的朋友可以參考下

非對稱加密算法是相對于對稱加密算法來說的，對于對稱加密算法請查閱之前的總結(jié)，今天為大家介紹一下DH算法，DH是一種密鑰交換算法，接收方根據(jù)發(fā)送方加密時的密鑰，生成接收方解密密鑰。下面就一起來學(xué)習(xí)一下吧：

初始化發(fā)送方密鑰：

KeyPairGenerator sendKeyPairGenerator = KeyPairGenerator.getInstance("DH");
      sendKeyPairGenerator.initialize(512);
      KeyPair sendKeyPair = sendKeyPairGenerator.generateKeyPair();
      byte[] sendPublicKeyEnc = sendKeyPair.getPublic().getEncoded();//生成發(fā)送方公鑰，發(fā)送給接收方（網(wǎng)絡(luò)、文件...）

初始化接收方密鑰：

KeyFactory receiverKeyFactory = KeyFactory.getInstance("DH");
      X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(sendPublicKeyEnc);
      PublicKey receivePublicKey = receiverKeyFactory.generatePublic(x509EncodedKeySpec);
      DHParameterSpec dhParameterSpec = ((DHPublicKey)receivePublicKey).getParams();
      KeyPairGenerator receiverKeyPairGenerator = KeyPairGenerator.getInstance("DH");
      receiverKeyPairGenerator.initialize(dhParameterSpec);
      KeyPair receiverKeyPair = receiverKeyPairGenerator.generateKeyPair();
      PrivateKey receiverPrivateKey = receiverKeyPair.getPrivate();
      byte[] receiverPublicKeyEnc = receiverKeyPair.getPublic().getEncoded();

構(gòu)建接收方密鑰：

KeyAgreement receiverKeyAgreement = KeyAgreement.getInstance("DH");
      receiverKeyAgreement.init(receiverPrivateKey);
      receiverKeyAgreement.doPhase(receivePublicKey, true);
      
      SecretKey receiverDESKey = receiverKeyAgreement.generateSecret("DES");//接收方Key

構(gòu)建發(fā)送方密鑰：

KeyFactory sendKeyFactory = KeyFactory.getInstance("DH");
      x509EncodedKeySpec = new X509EncodedKeySpec(receiverPublicKeyEnc);
      PublicKey sendPublicKey = sendKeyFactory.generatePublic(x509EncodedKeySpec);
      
      KeyAgreement sendKeyAgreement = KeyAgreement.getInstance("DH");
      sendKeyAgreement.init(sendKeyPair.getPrivate());
      sendKeyAgreement.doPhase(sendPublicKey, true);
      
      SecretKey sendDESKey = sendKeyAgreement.generateSecret("DES");//發(fā)送方Key

發(fā)送方加密：

Cipher sendCipher = 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：

Cipher receiverCipher = Cipher.getInstance("DES");
      receiverCipher.init(Cipher.DECRYPT_MODE, receiverDESKey);
      byte[] receiverResult = receiverCipher.doFinal(sendResult);
      System.out.println("receiverResult : "+new String (receiverResult));

基于密鑰交換的非對稱加密算法（DH）,到這里就總結(jié)完畢了。

以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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