如何在C＃Windows Form应用程序中使用aes_encrypt

Question

I have been mainly writing in PHP and only know one way to create an aes encryption for a variable:

aes_encrypt(variableName, 'SecretSalt')

I need to encrypt a variable in C# and I have tried a similar approach as in PHP but it is not working (I get an error "The name aes does not exist in current context"

Here is my current code in C#:

        var username = txtusername.Text;
        var password = txtpassword.Text;
        var usernameAES = aes_encrypt(username, 'mySalt');

What is the correct way to use AES_ENCRYPT ? I am sending the variable to a PHP Web Service

Update: More C# code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Net.Http;
using System.Net;
using System.IO;
using System.Threading;

        private void Login()
    {
        if (String.IsNullOrEmpty(txtusername.Text))
        {
            MessageBox.Show("Please insert username");
        }

        if (String.IsNullOrEmpty(txtpassword.Text))
        {
            MessageBox.Show("Please insert password");
        }
        var Token = "TMMZC 77385 R8G2D6";
        var username = txtusername.Text;
        var password = txtpassword.Text;
        var usernameAES = aes_encrypt(username, 'mySalt');
        var url = "https://mydomain.co.za/LoginVerification.php?";
        var var = "username=" + username + "&password=" + password + "&Token=" + Token Token;
        var URL = url + var;

        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URL);
        HttpWebResponse response = (HttpWebResponse)request.GetResponse();
        Stream dataStream = response.GetResponseStream();
        // Open the stream using a StreamReader for easy access.  
        StreamReader reader = new StreamReader(dataStream);
        // Read the content.  
        var responseFromServer = reader.ReadToEnd();
        //MessageBox.Show(responseFromServer);
        // Display the content.  
        if (responseFromServer == "Allow")
        {
            //Open Form1
            Form1 Form = new Form1();
            Form.Show();

            //CLose Password Form
            Password PasswordForm = new Password();
            PasswordForm.Close();
        }

Answer 1

try this code

using System.Security.Cryptography;
using System.IO;


public string EncryptText(string input, string password)
{
    // Get the bytes of the string
    byte[] bytesToBeEncrypted = Encoding.UTF8.GetBytes(input);
    byte[] passwordBytes = Encoding.UTF8.GetBytes(password);

    // Hash the password with SHA256
    passwordBytes = SHA256.Create().ComputeHash(passwordBytes);

    byte[] bytesEncrypted = AES_Encrypt(bytesToBeEncrypted, passwordBytes);

    string result = Convert.ToBase64String(bytesEncrypted);

    return result;
}

public byte[] aes_encrypt(byte[] bytesToBeEncrypted, byte[] passwordBytes)
{
    byte[] encryptedBytes = null;

    // Set your salt here, change it to meet your flavor:
    // The salt bytes must be at least 8 bytes.
    byte[] saltBytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 };

    using (MemoryStream ms = new MemoryStream())
    {
        using (RijndaelManaged AES = new RijndaelManaged())
        {
            AES.KeySize = 256;
            AES.BlockSize = 128;

            var key = new Rfc2898DeriveBytes(passwordBytes, saltBytes, 1000);
            AES.Key = key.GetBytes(AES.KeySize / 8);
            AES.IV = key.GetBytes(AES.BlockSize / 8);

            AES.Mode = CipherMode.CBC;

            using (var cs = new CryptoStream(ms, AES.CreateEncryptor(), CryptoStreamMode.Write))
            {
                cs.Write(bytesToBeEncrypted, 0, bytesToBeEncrypted.Length);
                cs.Close();
            }
            encryptedBytes = ms.ToArray();
        }
    }

    return encryptedBytes;
}