学步园

public class Security
{
    private RSACryptoServiceProvider RSAProvider;
    private string m_ContainerName;

    public string ContainerName
    {
        get
        {
            return m_ContainerName;
        }
        set
        {
            m_ContainerName = value;
        }
    }

 public Security()
 {
  //
  // TODO: 在此处添加构造函数逻辑
  //
        ContainerName = "Kotei";
 }

    public Security(string containername)
    {
        ContainerName = containername;
    }

    public string Encrypt(string encryptString)
    {
        CspParameters csp = new CspParameters();
        csp.KeyContainerName = ContainerName;
        RSAProvider = new RSACryptoServiceProvider(csp);
        byte[] encryptBytes = RSAProvider.Encrypt(ASCIIEncoding.ASCII.GetBytes(encryptString), true);
        string str = "";
        foreach (byte b in encryptBytes)
        {
            str = str + string.Format("{0:x2}", b);
        }
        return str;
    }

    public string Decrypt(string decryptString)
    {
        CspParameters csp = new CspParameters();
        csp.KeyContainerName = ContainerName;
        RSAProvider = new RSACryptoServiceProvider(csp);
        int length = (decryptString.Length / 2);
        byte[] decryptBytes = new byte[length];
        for (int index = 0; index < length; index++)
        {
            string substring = decryptString.Substring(index * 2, 2);
            decryptBytes[index] = Convert.ToByte(substring, 16);
        }
        decryptBytes = RSAProvider.Decrypt(decryptBytes, true);
        return ASCIIEncoding.ASCII.GetString(decryptBytes);
    }
}