WebService RSA加密传输示例

public class secureServices : System.Web.Services.WebService
{
    public secureServices()
    {
        //如果使用设计的组件，请取消注释以下行
        //InitializeComponent();
    }
 
    [WebMethod()]
//公开的方法 ，返回加密的公钥，xml的形式
    public string GetPublicKey()
    {
        RSACryptoServiceProvider cryot = GetKeyFromState();
        return cryot.ToXmlString(false );
    }
//生成一个 RSA算法的对象，该对象生成的时候，就自动生成出公钥，私钥
    private RSACryptoServiceProvider GetKeyFromState()
    {
        RSACryptoServiceProvider crypt = null;
        if (Application["Key"] == null)
        {
      //把RSA对象放置在全局的缓冲区，方便解密时使用
            CspParameters param = new CspParameters();
            param.Flags = CspProviderFlags.UseMachineKeyStore;
            crypt = new RSACryptoServiceProvider(param);
            Application["Key"] = crypt;
        }
        else
        {
            crypt = (RSACryptoServiceProvider)Application["Key"];
        }
        return crypt;
    }
    [WebMethod(Description = "Parameters to this method must be encrypted with the web service public key")]
    public string  DepositFunds(byte[] encryptedAccountNumber,byte[] encryptedAmount)
    {
//模拟的一个公开的方法，给客户传递加密的用户名和钱的数量
        RSACryptoServiceProvider crypt = GetKeyFromState();
        string decryptedAccountNumber;
        decimal decryptedAmount;
        System.Text.UnicodeEncoding ncd = new System.Text.UnicodeEncoding();
//解密过程
        decryptedAccountNumber = ncd.GetString(crypt.Decrypt(encryptedAccountNumber,false));
        decryptedAmount = Decimal.Parse(ncd.GetString(crypt.Decrypt(encryptedAmount,false)));
//向调用客户返回一个字符串，明文，带有解密信息
        return decryptedAccountNumber + "has used" + decryptedAmount.ToString();

    }
    private void DESCryptoNotes()
    {
    }
}

客户端来说，必须添加这个 webservice引用

然后生成一个服务器的代理对象，通过服务器的公钥加密要传递的数据

private void button1_Click(object sender,EventArgs e)
        {
            WindowsApplication1.localhost.secureServices proxy =new  WindowsApplication1.localhost.secureServices();
            RSACryptoServiceProvider crypt = new RSACryptoServiceProvider();
//加密数据，使用服务器传递的公钥，由于是非对称加密的公钥，所以可以公开
给任何人，通过公钥来构造加密对象
            crypt.FromXmlString(proxy.GetPublicKey());
            string accountName = textBox1.Text;
            string amount = textBox2.Text;

            byte[] encryptedAccountName,encryptedAmount;
            System.Text.UnicodeEncoding  uce=new UnicodeEncoding ();
            encryptedAccountName = crypt.Encrypt(uce.GetBytes(accountName),false );
            encryptedAmount = crypt.Encrypt(uce.GetBytes(amount),false);
//把加密信息发送给服务器，然后吧返回值显示出来           
 MessageBox.Show(proxy.DepositFunds(encryptedAccountName,encryptedAmount));
        }