java 中DH的方式实现非对称加密的实例
java中DH的方式实现非对称加密的实例
实现代码：
packagecom.sahadev;
importjava.security.KeyFactory;
importjava.security.KeyPair;
importjava.security.KeyPairGenerator;
importjava.security.PrivateKey;
importjava.security.PublicKey;
importjava.security.spec.X509EncodedKeySpec;
importjava.util.Objects;
importjavax.crypto.Cipher;
importjavax.crypto.KeyAgreement;
importjavax.crypto.SecretKey;
importjavax.crypto.interfaces.DHPublicKey;
importjavax.crypto.spec.DHParameterSpec;
importorg.apache.commons.codec.binary.Hex;
publicclassDH{
publicstaticStringsrc="Hello,sahadev!";
publicstaticvoidmain(String[]args){
JDKDH();
}
publicstaticvoidJDKDH(){
try{
//初始化发送方密钥
KeyPairGeneratorsenderKeyPairGenerator=KeyPairGenerator.getInstance("DH");
senderKeyPairGenerator.initialize(512);
KeyPairsenderKeyPair=senderKeyPairGenerator.generateKeyPair();
byte[]senderPublicKey=senderKeyPair.getPublic().getEncoded();
//初始化接收方的密钥
KeyFactoryinstance=KeyFactory.getInstance("DH");
X509EncodedKeySpecx509EncodedKeySpec=newX509EncodedKeySpec(senderPublicKey);
PublicKeysendPublicKeyTemp=instance.generatePublic(x509EncodedKeySpec);
DHParameterSpecdhParameterSpec=((DHPublicKey)sendPublicKeyTemp).getParams();
KeyPairGeneratorkeyPairGenerator=KeyPairGenerator.getInstance("DH");
keyPairGenerator.initialize(dhParameterSpec);
//接收方生成密钥
KeyPairgenerateKeyPair=keyPairGenerator.generateKeyPair();
byte[]receiverPublicKey=generateKeyPair.getPublic().getEncoded();
PrivateKeyreceiverPrivateKey=generateKeyPair.getPrivate();
//接收方密钥构建
KeyAgreementreceiverKeyAgreement=KeyAgreement.getInstance("DH");
receiverKeyAgreement.init(receiverPrivateKey);
receiverKeyAgreement.doPhase(senderKeyPair.getPublic(),true);
//使用我的密钥和你的公钥生成密钥
SecretKeyreceiverDesKey=receiverKeyAgreement.generateSecret("DES");
//发送方密钥构建
KeyFactorykeyFactory=KeyFactory.getInstance("DH");
X509EncodedKeySpecx509EncodedKeySpec2=newX509EncodedKeySpec(receiverPublicKey);
PublicKeyreceiverPublicKeyTemp=keyFactory.generatePublic(x509EncodedKeySpec2);
//发送方拿到接收方返回的公钥做本地密钥
KeyAgreementsenderKeyAgreement=KeyAgreement.getInstance("DH");
senderKeyAgreement.init(senderKeyPair.getPrivate());
senderKeyAgreement.doPhase(receiverPublicKeyTemp,true);
//使用你的密钥我的公钥进行构建
SecretKeysenderDesKey=senderKeyAgreement.generateSecret("DES");
//判断双方的本地密钥是否相同
if(Objects.equals(receiverDesKey,senderDesKey)){
System.out.println("双方密钥相同");
}
//加密
Ciphercipher=Cipher.getInstance("DES");
cipher.init(Cipher.ENCRYPT_MODE,senderDesKey);
byte[]result=cipher.doFinal(src.getBytes());
System.out.println("加密结果为:"+Hex.encodeHexString(result));
//解密
cipher.init(Cipher.DECRYPT_MODE,senderDesKey);
result=cipher.doFinal(result);
System.out.println("解密结果为:"+newString(result));
}catch(Exceptione){
e.printStackTrace();
}
}
}
附上结果：
双方密钥相同 DES:da1cc13d388423e82a110539414b1ec0 解密结果为:Hello,sahadev!
以上就是DH实现非对称加密的实例，如有疑问请留言或者到本站社区交流讨论，感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！