java实现DH密钥交换生成完整代码
时间: 2023-11-28 11:06:28 浏览: 35
下面是Java实现Diffie-Hellman密钥交换的完整代码:
```java
import java.math.BigInteger;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PublicKey;
import java.security.spec.X509EncodedKeySpec;
import javax.crypto.KeyAgreement;
import javax.crypto.interfaces.DHPublicKey;
import javax.crypto.spec.DHParameterSpec;
public class DiffieHellmanExample {
public static void main(String[] args) throws Exception {
// 1. 生成 DH 密钥对
KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("DiffieHellman");
keyPairGenerator.initialize(1024);
KeyPair keyPair = keyPairGenerator.generateKeyPair();
// 2. 获取 DH 参数
DHPublicKey publicKey = (DHPublicKey) keyPair.getPublic();
BigInteger p = publicKey.getParams().getP();
BigInteger g = publicKey.getParams().getG();
// 3. 将 DH 参数传递给对方
byte[] publicKeyBytes = publicKey.getEncoded();
// 4. 对方获得 DH 参数后,生成自己的 DH 密钥对
KeyFactory keyFactory = KeyFactory.getInstance("DiffieHellman");
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(publicKeyBytes);
PublicKey receivedPublicKey = keyFactory.generatePublic(keySpec);
KeyPairGenerator receivedKeyPairGenerator = KeyPairGenerator.getInstance("DiffieHellman");
receivedKeyPairGenerator.initialize(new DHParameterSpec(p, g));
KeyPair receivedKeyPair = receivedKeyPairGenerator.generateKeyPair();
// 5. 双方生成密钥
KeyAgreement keyAgreement = KeyAgreement.getInstance("DiffieHellman");
keyAgreement.init(keyPair.getPrivate());
keyAgreement.doPhase(receivedPublicKey, true);
byte[] sharedSecret1 = keyAgreement.generateSecret();
keyAgreement = KeyAgreement.getInstance("DiffieHellman");
keyAgreement.init(receivedKeyPair.getPrivate());
keyAgreement.doPhase(publicKey, true);
byte[] sharedSecret2 = keyAgreement.generateSecret();
// 6. 双方生成的密钥相同
System.out.println("Shared secret 1: " + bytesToHexString(sharedSecret1));
System.out.println("Shared secret 2: " + bytesToHexString(sharedSecret2));
}
private static String bytesToHexString(byte[] bytes) {
StringBuilder sb = new StringBuilder();
for (byte b : bytes) {
sb.append(String.format("%02X", b));
}
return sb.toString();
}
}
```
这段代码使用Java标准库中的Diffie-Hellman算法,生成了一对DH密钥对,并实现了密钥交换过程。在这个示例中,密钥长度为1024位,可以根据需要进行调整。
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