/// <summary>
/// RSA加载JAVA PrivateKey
/// </summary>
/// <param name="privateJavaKey">java提供的第三方私钥</param>
/// <returns></returns>
public static void FromPrivateKeyJavaString(this System.Security.Cryptography.RSA rsa, string privateJavaKey)
{
string xmlPrivateKey = rsa.ConvertToXmlPrivateKey(privateJavaKey);
rsa.FromXmlString(xmlPrivateKey);
}