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‎AesOperation.cs‎

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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Security.Cryptography;
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using System.Text;
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//Encryption And Decryption Using A Symmetric Key In C#
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//Ref. https://www.c-sharpcorner.com/article/encryption-and-decryption-using-a-symmetric-key-in-c-sharp/
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namespace OfflinePM
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{
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public class AesOperation
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{
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public static string EncryptString(string key, string plainText)
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{
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byte[] iv = new byte[16];
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byte[] array;
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using (Aes aes = Aes.Create())
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{
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aes.Key = Encoding.UTF8.GetBytes(key);
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aes.IV = iv;
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ICryptoTransform encryptor = aes.CreateEncryptor(aes.Key, aes.IV);
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using (MemoryStream memoryStream = new MemoryStream())
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{
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using (CryptoStream cryptoStream = new CryptoStream((Stream)memoryStream, encryptor, CryptoStreamMode.Write))
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{
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using (StreamWriter streamWriter = new StreamWriter((Stream)cryptoStream))
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{
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streamWriter.Write(plainText);
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}
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array = memoryStream.ToArray();
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}
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}
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}
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return Convert.ToBase64String(array);
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}
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public static string DecryptString(string key, string cipherText)
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{
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byte[] iv = new byte[16];
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byte[] buffer = Convert.FromBase64String(cipherText);
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using (Aes aes = Aes.Create())
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{
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aes.Key = Encoding.UTF8.GetBytes(key);
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aes.IV = iv;
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ICryptoTransform decryptor = aes.CreateDecryptor(aes.Key, aes.IV);
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using (MemoryStream memoryStream = new MemoryStream(buffer))
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{
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using (CryptoStream cryptoStream = new CryptoStream((Stream)memoryStream, decryptor, CryptoStreamMode.Read))
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{
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using (StreamReader streamReader = new StreamReader((Stream)cryptoStream))
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{
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return streamReader.ReadToEnd();
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}
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}
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}
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}
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}
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}
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}

‎Frm_Add.Designer.cs‎

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‎Frm_Add.cs‎

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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Data;
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using System.Drawing;
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using System.IO;
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using System.Text;
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using System.Threading.Tasks;
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using System.Windows.Forms;
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namespace OfflinePM
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{
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public partial class Frm_Add : Form
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{
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public Frm_Add()
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{
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InitializeComponent();
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}
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private void btn_add_Click(object sender, EventArgs e)
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{
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int duplicate = 0;
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try
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{
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using (StreamReader sr = File.OpenText(Application.StartupPath + @"\Data.opm"))
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{
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string[] lines = sr.ReadToEnd().Split(new[] { Environment.NewLine },StringSplitOptions.None);
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foreach(string str in lines)
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{
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string[] real_str = str.Split("|");
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if(real_str[0] == txt_addweb.Text)
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{
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duplicate = 1;
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}
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sr.Close();
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}
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}
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}
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catch
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{
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}
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finally
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{
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if (duplicate != 0)
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{
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MessageBox.Show("duplicate data");
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}
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else
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{
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using (StreamWriter sw = File.AppendText(Application.StartupPath + @"\Data.opm"))
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{
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var key = "843f0736881b4c8e95b5c4459105be0b";
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string plaintext = txt_addweb.Text + "|" + txt_adduser.Text + "|" + txt_addpwd.Text;
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var encryptedString = AesOperation.EncryptString(key, plaintext);
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sw.WriteLine(encryptedString);
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}
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this.Close();
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}
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}
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}
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}
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}

‎Frm_Add.resx‎

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<root>
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<xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
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<xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
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<xsd:element name="root" msdata:IsDataSet="true">
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<xsd:complexType>
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<xsd:choice maxOccurs="unbounded">
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<xsd:element name="metadata">
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<xsd:complexType>
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<xsd:sequence>
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<xsd:element name="value" type="xsd:string" minOccurs="0" />
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</xsd:sequence>
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<xsd:attribute name="name" use="required" type="xsd:string" />
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<xsd:attribute name="type" type="xsd:string" />
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<xsd:attribute name="mimetype" type="xsd:string" />
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<xsd:attribute ref="xml:space" />
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</xsd:complexType>
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</xsd:element>
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<xsd:element name="assembly">
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<xsd:complexType>
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<xsd:attribute name="alias" type="xsd:string" />
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<xsd:attribute name="name" type="xsd:string" />
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</xsd:complexType>
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</xsd:element>
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<xsd:element name="data">
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<xsd:complexType>
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<xsd:sequence>
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<xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
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<xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
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</xsd:sequence>
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<xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
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<xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
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<xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
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<xsd:attribute ref="xml:space" />
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</xsd:complexType>
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</xsd:element>
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<xsd:element name="resheader">
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<xsd:complexType>
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<xsd:sequence>
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<xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
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</xsd:sequence>
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<xsd:attribute name="name" type="xsd:string" use="required" />
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</xsd:complexType>
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</xsd:element>
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</xsd:choice>
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</xsd:complexType>
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</xsd:element>
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</xsd:schema>
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<resheader name="resmimetype">
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<value>text/microsoft-resx</value>
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</resheader>
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<resheader name="version">
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<value>2.0</value>
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</resheader>
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<resheader name="reader">
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<value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
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</resheader>
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<resheader name="writer">
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<value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
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</resheader>
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</root>

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