RSA2密鑰轉換《PEMToXML》

var rsaPrivate = PEMToXML_All(_Config.RSAPrivate);//私鑰_Config.RSAPrivate

  #region PEM轉XML

    /// <summary>
    /// PEM格式的密鑰轉XML格式
    /// </summary>
    /// <param name="pemkey">pem格式的密鑰</param>
    /// <param name="isprikey">true：私鑰;false：公鑰</param>
    /// <returns>xml格式密鑰</returns>
    public static string PEMToXML_All(string pemkey)
    {
        // 將PEM格式的密鑰中的私鑰標識替換為空
        pemkey = pemkey.Replace("-----BEGIN PRIVATE KEY-----", "").Replace("-----END PRIVATE KEY-----", "");
        // 聲明變量
        string rsaKey = string.Empty;
        object pemObject = null;
        RSAParameters rsaPara = new RSAParameters();

        // 從字符串讀取PEM格式的密鑰
        using (StringReader sReader = new StringReader(pemkey))
        {
            var pemReader = new Org.BouncyCastle.OpenSsl.PemReader(sReader);
            pemObject = pemReader.ReadObject();
        }

        // 獲取RSA私鑰參數
        RsaPrivateCrtKeyParameters key = (RsaPrivateCrtKeyParameters)PrivateKeyFactory.CreateKey(Convert.FromBase64String(pemkey));
        rsaPara = new RSAParameters
        {
            Modulus = key.Modulus.ToByteArrayUnsigned(),
            Exponent = key.PublicExponent.ToByteArrayUnsigned(),
            D = key.Exponent.ToByteArrayUnsigned(),
            P = key.P.ToByteArrayUnsigned(),
            Q = key.Q.ToByteArrayUnsigned(),
            DP = key.DP.ToByteArrayUnsigned(),
            DQ = key.DQ.ToByteArrayUnsigned(),
            InverseQ = key.QInv.ToByteArrayUnsigned(),
        };

        // 將RSA私鑰參數導入到RSACryptoServiceProvider對象
        RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
        rsa.ImportParameters(rsaPara);

        // 將RSACryptoServiceProvider對象轉換為XML格式的字符串
        using (StringWriter sw = new StringWriter())
        {
            sw.Write(rsa.ToXmlString(true));
            rsaKey = sw.ToString();
        }

        return rsaKey;
    }

    #endregion