How To Decrypt Encrypted json object to its origial state

Question

I can Able to Encrypted the json object but when i try to decrypt the encrypted data to json

it is showing different response pls help me

When i try to debug im getting different symbols idk how to do it pls help me

This is my encryption code

protected void Button1_Click(object sender, EventArgs e)
        {
            var encrypted = Convert.ToString(TextEncrypt.Text);
            string jsonString = JsonConvert.SerializeObject(encrypted);
            //TextDecrypt.Text = "";
            string publickey = "santhosh";
            string secretkey = "engineer";
            byte[] secretkeyByte = { };
            secretkeyByte = Encoding.UTF8.GetBytes(secretkey);
            byte[] publickeybyte = { };
            publickeybyte = Encoding.UTF8.GetBytes(publickey);
            MemoryStream ms = null;
            CryptoStream cs = null;
            byte[] encryptedResult = Encoding.UTF8.GetBytes(encrypted);
            RijndaelManaged aes = new RijndaelManaged();
            aes.KeySize = 256;
            aes.BlockSize = 256;
            aes.Padding = PaddingMode.Zeros;
            aes.Mode = CipherMode.CBC;
            byte[] encodedTextBytes = Encoding.UTF8.GetBytes(TextEncrypt.Text);
            TextDecrypt.Text = Convert.ToBase64String(encodedTextBytes);

            //  Response.Write(TextDecrypt.Text);
            //  var toDecodeAsString = System.Convert.FromBase64String(encrypted);
            using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
            {
                RijndaelManaged AES = new RijndaelManaged();
                AES.KeySize = 256;
                AES.BlockSize = 128;
                ms = new MemoryStream();
                cs = new CryptoStream(ms, des.CreateEncryptor(publickeybyte, secretkeyByte), CryptoStreamMode.Write);
                cs.Write(encryptedResult, 0, encryptedResult.Length);
                cs.FlushFinalBlock();
                // Label1.Text = encryptedResult;
                TextDecrypt.Text = Convert.ToBase64String(encodedTextBytes);
                Label1.Text = Convert.ToBase64String(encodedTextBytes);
                
            }
        }

this is my json object


{id:487,mobile:9966368646,name :"jaya sai prakash",lname:"koyya",date:"2023-03-15",gender:"male",salary:"10000",location:"Nidadavolu"}





This is My code for decryption



 string publickey = "santhoshsanthosh";
            string privatekey = "mySecretKey1234567890engineer123";
            byte[] privatekeyByte = Encoding.UTF8.GetBytes(privatekey);
            byte[] publickeybyte = Encoding.UTF8.GetBytes(publickey);
            byte[] bytes = Convert.FromBase64String(TextDecrypt.Text);

            using (AesCryptoServiceProvider aes = new AesCryptoServiceProvider())
            {
                aes.Key = privatekeyByte;
                aes.IV = publickeybyte;

                using (MemoryStream ms = new MemoryStream(bytes))
                {
                    using (CryptoStream cs = new CryptoStream(ms, aes.CreateDecryptor(), CryptoStreamMode.Read))
                    {
                        using (StreamReader reader = new StreamReader(cs))
                        {
                            string decryptedText = reader.ReadToEnd();
                            TextEncrypt.Text = decryptedText;
                            Label2.Text = decryptedText;
                            Label1.Text = "";
                        }
                    }
                }
            }

Answer 1

your encryption and decryption code do not agree on keys or the encryption algorithm.

Answer 2

Hi @jaya prakash

I modified your answer code as follows:

 const string KEY_64 = "mySecretKey1234567890engineer123";
        const string IV_64 = "santhosh";
        protected void Page_Load(object sender, EventArgs e)
        {
        }
        public static string EnCrypt(string strContent, string strKey)
        {
            if (string.IsNullOrEmpty(strContent)) return string.Empty;
            if (strKey.Length > 8) strKey = strKey.Substring(0, 8); else strKey = KEY_64;
            byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(strKey);
            byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);
            DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
            int i = cryptoProvider.KeySize;
            MemoryStream ms = new MemoryStream();
            CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateEncryptor(byKey, byIV), CryptoStreamMode.Write);
            StreamWriter sw = new StreamWriter(cst);
            sw.Write(strContent);
            sw.Flush();
            cst.FlushFinalBlock();
            sw.Flush();
            return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length);
        }
        public static string DeCrypt(string strContent, string strKey)
        {
            if (string.IsNullOrEmpty(strContent)) return string.Empty;
            if (strKey.Length > 8) strKey = strKey.Substring(0, 8); else strKey = KEY_64;
            byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(strKey);
            byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);
            byte[] byEnc;
            try
            {
                byEnc = Convert.FromBase64String(strContent);
            }
            catch
            {
                return null;
            }
            DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
            MemoryStream ms = new MemoryStream(byEnc);
            CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateDecryptor(byKey, byIV), CryptoStreamMode.Read);
            StreamReader sr = new StreamReader(cst);
            return sr.ReadToEnd();
        }
        protected void Button1_Click(object sender, EventArgs e)
        {
            TextBox3.Text = EnCrypt(TextBox1.Text, TextBox2.Text);
        }
        protected void Button2_Click(object sender, EventArgs e)
        {
            TextBox6.Text = DeCrypt(TextBox4.Text, TextBox5.Text);
        }

<body>
    <form id="form1" runat="server">
        <div>
            <asp:Label ID="Label1" runat="server">Please enter the encrypted string</asp:Label>
            <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
        </div>
        <div>
            <asp:Label ID="Label2" runat="server">Please enter the key</asp:Label>
            <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
        </div>
        <div>
            <asp:Button ID="Button1" runat="server" Text="Encrypt" OnClick="Button1_Click" />
        </div>
        <div>
            <asp:Label ID="Label3" runat="server"> The encrypted string</asp:Label>
            <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
        </div>
        <br />
        <br />
        <br />
        <div>
            <asp:Label ID="Label4" runat="server"> Please enter the decrypted string</asp:Label>
            <asp:TextBox ID="TextBox4" runat="server"></asp:TextBox>
        </div>
        <div>
            <asp:Label ID="Label5" runat="server">Please enter the key</asp:Label>
            <asp:TextBox ID="TextBox5" runat="server"></asp:TextBox>
        </div>
        <div>
            <asp:Button ID="Button2" runat="server" Text="Decrypt" OnClick="Button2_Click" />
        </div>
        <div>
            <asp:Label ID="Label6" runat="server"> The decrypted string</asp:Label>
            <asp:TextBox ID="TextBox6" runat="server"></asp:TextBox>
        </div>
    </form>
</body>

KEY_64 is Key. We use this key every time we encrypt and decrypt.

It is mainly implemented using the DESCryptoServiceProvider class.

You can learn more form this document.

DESCryptoServiceProvider

Output:

Best regards,
Qi You

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