/// <summary>
/// 把java的私钥转换成.net的xml格式
/// </summary>
/// <param name="privateKey">java提供的第三方公钥</param>
/// <returns></returns>
public static void FromPublicKeyJavaString(this RSA rsa, string publicJavaKey)
{
string xmlpublicKey = rsa.ConvertToXmlPublicJavaKey(publicJavaKey);
rsa.FromXmlString(xmlpublicKey);
}