利用 TripleDES 來對字串進行加解密，這篇就單純紀錄課程中的 Code 而已
namespace MVATwentyQuestions
{
class Program
{
static void Main(string[] args)
{
string plainText = "This is plain text that we will encrypt";
string password = "P@$$w0rd";
string depassword = "doesn't work";
Console.WriteLine(plainText);
Console.WriteLine();
// create a new instance of our encryption class passing in the password as the key
DESEncrypt testEncrypt = new DESEncrypt();
string encText = testEncrypt.EncryptString(plainText, password);
Console.WriteLine("****** Encrypted text ******");
Console.WriteLine(encText);
Console.WriteLine();
Console.WriteLine("****** Decrypted text ******");
//string plain = testEncrypt.DecryptString(encText, password);
string plain = testEncrypt.DecryptString(encText, depassword);
Console.WriteLine(plain);
Console.WriteLine();
}
}
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Security.Cryptography;
using System.IO;
namespace MVATwentyQuestions
{
class DESEncrypt
{
static TripleDES CreateDES(string key)
{
MD5 md5 = new MD5CryptoServiceProvider();
TripleDES des = new TripleDESCryptoServiceProvider();
des.Key = md5.ComputeHash(Encoding.Unicode.GetBytes(key));
des.IV = new byte[des.BlockSize / 8];
return des;
}
public string EncryptString(string plainText, string password)
{
// first we convert the plain text into a byte array
byte[] plainTextBytes = Encoding.Unicode.GetBytes(plainText);
// use a memory stream to hold the bytes
MemoryStream myStream = new MemoryStream();
// create the key and initialization vector using the password
TripleDES des = CreateDES(password);
// create the encoder that will write to the memory stream
CryptoStream cryptStream = new CryptoStream(myStream, des.CreateEncryptor(), CryptoStreamMode.Write);
// we now use the crypto stream to write our byte array to the memory stream
cryptStream.Write(plainTextBytes, 0, plainTextBytes.Length);
cryptStream.FlushFinalBlock();
// change the encrypted stream to a printable version of our encrypted string
return Convert.ToBase64String(myStream.ToArray());
}
public string DecryptString(string encryptedText, string password)
{
// convert our encrypted string to a byte array
byte[] encryptedTextBytes = Convert.FromBase64String(encryptedText);
// create a memory stream to hold the bytes
MemoryStream myStream = new MemoryStream();
// create the key and initialization vector using the password
TripleDES des = CreateDES(password);
// create our decoder to write to the stream
CryptoStream decryptStream = new CryptoStream(myStream, des.CreateDecryptor(), CryptoStreamMode.Write);
// we now use the crypto stream to the byte array
decryptStream.Write(encryptedTextBytes, 0, encryptedTextBytes.Length);
decryptStream.FlushFinalBlock();
// convert our stream to a string value
return Encoding.Unicode.GetString(myStream.ToArray());
}
}
}
沒有留言:
張貼留言