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。