ECDSA如何在C＃中将私有和公共字节转换为单个共享密钥

Question

我正在尝试在C＃中实现ecdsa。我可以从生成密钥 ECKeyPairGenerator，但我需要反向进行。我已经有密钥需要创建一个密钥。

有人可以帮我吗？我用C＃编写代码。

public static AsymmetricCipherKeyPair LoadPublicKey(byte[] publickey)
        {
            string curveName = "prime192v1";
            //Here I m generating the key I need to replace but load the public key of byte
            var gen = new ECKeyPairGenerator();
            X9ECParameters ecP = X962NamedCurves.GetByOid(X9ObjectIdentifiers.Prime192v1);
            // var ecP21 = TeleTrusTNamedCurves.GetByName("brainpoolp512t1");
            //  X9ECParameters ecP = NistNamedCurves.GetByName(curveName);

            ECDomainParameters keyGenParam = new ECDomainParameters(ecP.Curve, ecP.G, ecP.N, ecP.H, ecP.GetSeed());
            var secureRandom = new SecureRandom();
            ECKeyGenerationParameters genParam = new ECKeyGenerationParameters(keyGenParam, secureRandom);
            gen.Init(genParam);
            return gen.GenerateKeyPair();//only want to return public key
        }

Answer 1

您可以尝试

    var keyParams = new ECParameters
    {
        Curve = jwk.Curve.ToECCurve(), #your curve name
        Q = new ECPoint #Define X and Y
        {
            X = jwk.X.FromBase64UrlSafe(),
            Y = jwk.Y.FromBase64UrlSafe()
        }
    };

ECDsa.Create(keyParams);