RSA 生成密钥的错误，请高手看看！

[sykey]

RSACryptoServiceProvider provider = new RSACryptoServiceProvider();

privateKey = provider.ToXmlString(true);

publicKey = provider.ToXmlString(false);

以上代码在生成密钥时会出现以下异常：
System.Security.Cryptography.CryptographicException: 系统找不到指定的文件。


错误是在ToXmlString方法上。

不知道各位遇到过这种错误了没？

小弟很穷，暂时没分，不过会记住各位的大恩的，呵呵

[rangeon]

参考：
http://www.cnblogs.com/webabcd/archive/2007/02/03/639164.html

[rangeon]

//加密算法
public string EnCodes(string text)
{
    RSACryptoServiceProvider rsa1 = new RSACryptoServiceProvider();
    RSACryptoServiceProvider rsa2 = new RSACryptoServiceProvider();

    string publicKey = rsa1.ToXmlString(true);
    HttpContext.Current.Response.Cookies["PublicKey"].Value = publicKey;
    rsa2.FromXmlString(publicKey);
    byte[] ECode = rsa2.Encrypt(System.Text.Encoding.UTF8.GetBytes(text),false);

    return Convert.ToBase64String(ECode);
}

//解密算法
public string DeCodes(string text)
{
    RSACryptoServiceProvider rsa1 = new RSACryptoServiceProvider();

    byte[] DCode = Convert.FromBase64String(text);
    string publicKey = HttpContext.Current.Request.Cookies["PublicKey"].Value.ToString();
    rsa1.FromXmlString(publicKey);
    byte[] DCode2 = rsa1.Decrypt(DCode,false);

    return System.Text.Encoding.UTF8.GetString(DCode2);
}