如何在 dotnet core 3.1 MacOS 上使用 ECDsa 使用现有私钥对消息进行签名?

How to sign a message with existing private key by using ECDsa on dotnet core 3.1 MacOS?

我通过 运行 以下命令生成了一个密钥:

openssl ecparam -genkey -name secp256k1 -out private.key

值得一提的是,我不得不使用 secp256k1 曲线。

这里是private.key:

-----BEGIN EC PARAMETERS-----
BgUrgQQACg==
-----END EC PARAMETERS-----
-----BEGIN EC PRIVATE KEY-----
MHQCAQEEIMaqRFP3zkco2B2xZaIDQ0/JGcgOqzLPcTTJPqvpu+UooAcGBSuBBAAK
oUQDQgAEp0mktO9BMlsVw9lG8EIxr9wZizBHSlUv3VIbf3sTBmCxE4myJvZcgF8b
qDp0T/o9TqnsBw15LU3wdnqV4tJp6w==
-----END EC PRIVATE KEY-----

然后我尝试签署一些随机的纯文本消息:

var privateKey = CngKey.Import(privateKeyBytes, CngKeyBlobFormat.EccPrivateBlob);
var signer = new ECDsaCng(privateKey);
var signed = signer.SignData(messageBytes, HashAlgorithmName.SHA256);

但是在调用 CngKey.Import 时遇到问题:Windows Cryptography Next Generation (CNG) is not supported on this platform. (MacOS)

有什么办法可以跨平台实现吗?

感谢 Maarten Bodewes I found BouncyCastle.NetCore包。

这是一个解决方案:

public void Main()
{
    var asymmetricCipherKeyPair = ReadAsymmetricCipherKeyPairFromPem("./key.pem");
    var signature = GetSignature(asymmetricCipherKeyPair.Private, "Some message");
}

private string GetSignature(AsymmetricKeyParameter privateKeyParameter, string message)
{
    var signer = SignerUtilities.GetSigner("SHA-256withECDSA");

    signer.Init(true, privateKeyParameter);

    signer.BlockUpdate(Encoding.ASCII.GetBytes(message), 0, Encoding.ASCII.GetBytes(message).Length);

    var signature = signer.GenerateSignature();

    return Convert.ToBase64String(signature);
}

private AsymmetricCipherKeyPair ReadAsymmetricCipherKeyPairFromPem(string pathToPem)
{
    using var reader = File.OpenText(pathToPem); 
    var keyPair = (AsymmetricCipherKeyPair)new PemReader(reader).ReadObject();

    return keyPair;
}

This library 使用纯 C# 安全地生成密钥、签名和验证 ECDSA-secp256k1 签名。在 .NET Standard 1.3+ 上运行。这是一个例子:

using System;
using EllipticCurve;

PrivateKey privateKey = PrivateKey.fromPem(privateKeyPem);

Signature signature = Ecdsa.sign(message, privateKey);
Console.WriteLine(signature.toBase64());

PublicKey publicKey = privateKey.publicKey();
Console.WriteLine(Ecdsa.verify(message, signature, publicKey));