java - 如何为diffie hellman算法生成curve25519 key 对？

我想在我的项目中实现ECDHE算法，为此我想使用Curve25519。但是卡住了如何为Curve25519生成密钥对。对于其他曲线，我能够生成密钥对，但是对于Curve25519，找不到算法

我尝试了以下代码:

KeyPairGenerator kpg = KeyPairGenerator.getInstance("EC");
        kpg.initialize(256);
        KeyPair private_Key1 = kpg.generateKeyPair();
       PublicKey ourPk1 = private_Key1.getPublic();

最佳答案

您可以将 BouncyCastle 用作支持此曲线的加密提供程序:

import org.bouncycastle.asn1.x9.X9ECParameters;
import org.bouncycastle.crypto.ec.CustomNamedCurves;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.jce.spec.ECParameterSpec;

import java.security.InvalidAlgorithmParameterException;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;

public class Test {
    public static void main(String[] args) throws NoSuchAlgorithmException, InvalidAlgorithmParameterException {
        X9ECParameters curveParams = CustomNamedCurves.getByName("Curve25519");
        ECParameterSpec ecSpec = new ECParameterSpec(curveParams.getCurve(), curveParams.getG(), curveParams.getN(), curveParams.getH(), curveParams.getSeed());

        KeyPairGenerator kpg = KeyPairGenerator.getInstance("EC", new BouncyCastleProvider());
        kpg.initialize(ecSpec);

        KeyPair keyPair = kpg.generateKeyPair();
        PublicKey publicKey = keyPair.getPublic();
        PrivateKey privateKey = keyPair.getPrivate();

    }
}