cagegit

public static void Main()
{
  var privateKey = "your privateKey string";
  privateKey = $"-----BEGIN RSA PRIVATE KEY-----{Environment.NewLine}{privateKey}{Environment.NewLine}-----END RSA PRIVATE KEY-----";
  var key = "your key need to be decrypt";
  var rsa = RSA.Create();
  rsa.ImportFromPem(privateKey.ToCharArray());
  var decryptedBytes = rsa.Decrypt(
    Convert.FromBase64String(key), 
    RSAEncryptionPadding.Pkcs1