如何使用我自己的RSA私钥使用RS256算法签个字节？

问题描述

我有我自己的私人密钥字符串，即

I have my own private key string, i.e.

-----BEGIN RSA PRIVATE KEY-----

MIICXAIBAAKBgQCSAYYgzvGTww....
....
....
.....
3yUMYj9oYzqdrRHP0XgD0cEEvyqPBwLaNsRdFwy5qTiHjj0f+ZWHQWmqcoLmmpzyZEbIvQm/VhbjRF6iKG4WZ9Hfa7ntYRNGdWgD/KMIeZI=

-----END RSA PRIVATE KEY-----

现在，我需要注册使用C＃此私钥生成JWT有效载荷我的声明集

Now, I need to sign my claim set using this private key in C# to generate JWT payload.

我写了下面的代码：

var utc0 = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
var issueTime = DateTime.Now;

var iat = (int)issueTime.Subtract(utc0).TotalSeconds;
var exp = (int)issueTime.AddMinutes(55).Subtract(utc0).TotalSeconds;

var payload = new
{
    iss = email,
    prn = prn,
    scope = "scope",
    aud = "https://example.com",
    exp = exp,
    iat = iat
};

var segments = new List<string>();
var header = new { typ = "JWT", alg = "RS256" };

byte[] headerBytes = Encoding.UTF8.GetBytes(jsonSerializer.Serialize(header));
byte[] payloadBytes = Encoding.UTF8.GetBytes(jsonSerializer.Serialize(payload));

segments.Add(Base64UrlEncode(headerBytes));
segments.Add(Base64UrlEncode(payloadBytes));

var stringToSign = string.Join(".", segments.ToArray());

var bytesToSign = Encoding.UTF8.GetBytes(stringToSign);

现在我需要这些bytesToSign正如我上面使用RS256算法FFT提到要由我的私钥签名。任何人都可以帮忙吗？

Now I need these bytesToSign to be signed by my private key as I mentioned above using the rs256 alogorithm. Can anyone help?

我已经更新了我的代码按以下内容：

I've updated my code as per the following:

var pemprivatekey = OpenSSLKey.DecodeOpenSSLPrivateKey(privateKey);
RSACryptoServiceProvider rsaProvider = new RSACryptoServiceProvider();

if (pemprivatekey != null)
{
    rsaProvider = OpenSSLKey.DecodeRSAPrivateKey(pemprivatekey);
}

byte[] signature = rsaProvider.SignData(bytesToSign, "SHA256");

segments.Add(Base64UrlEncode(signature));

return string.Join(".", segments.ToArray());

和生成JWT令牌。请让我知道我犯了一个错误作为其不正确的一项：当我把它传递给API，它不工作，并抛出一个错误

and generated JWT token. Please let me know where I made a mistake as its not correct one: when I pass it to the API, it doesn't work and throws an error.

推荐答案

我发现了一些纯粹基于JavaScript的解决方案，如果是有用的人。你可以找到的JS库。

I found some purely Javascript based solution, if it is useful to anyone. You can find the JS Libraries here.

这解决了我的要求。

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