如何使用BouncyCastle C＃从RSA私钥获取RSA keyid / Fingerprint

Question

我正在使用BouncyCastle来读取RSA私钥，我想从私钥中获取指纹或唯一密钥ID。

下面是代码

using (Stream stream = new MemoryStream(privateKey))
{
    using (var reader = new StreamReader(stream))
    {
        RsaPrivateCrtKeyParameters rsaPrivatekey;
        if (!string.IsNullOrEmpty(passPhrase))
        {
            var privateKeyObject = new PemReader(reader, new PasswordFinder(passPhrase)).ReadObject();
            rsaPrivatekey = (RsaPrivateCrtKeyParameters) privateKeyObject;
        }
        else
        {
            var privateKeyObject = new PemReader(reader).ReadObject();
            rsaPrivatekey = (RsaPrivateCrtKeyParameters) privateKeyObject;
        }
       /*here I want to get the Key Id or Fingerprint using 
       rsaPrivatekey object*/

    }
}