Zi 字媒體
2017-07-25T20:27:27+00:00
C# AES加解密
資料來源:http://joyceevent.blogspot.tw/2015/09/c-javascript-aes.html
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;
using System.IO;
namespace CS_Console_AES
{
class Program
{
//解密資料
public static string DecryptStringAES(string cipherText)
{
var keybytes = Encoding.UTF8.GetBytes(“8080808080808080”); //自行設定，但要與JavaScript端 一致
var iv = Encoding.UTF8.GetBytes(“8080808080808080”); // 自行設定，但要與JavaScript端 一致
var encrypted = Convert.FromBase64String(cipherText);
var decriptedFromJavascript = DecryptStringFromBytes(encrypted, keybytes, iv);
return string.Format(decriptedFromJavascript);
}
private static string DecryptStringFromBytes(byte[] cipherText, byte[] key, byte[] iv)
{
if (cipherText == null || cipherText.Length <= 0)
{
throw new ArgumentNullException(“cipherText”);
}
if (key == null || key.Length <= 0)
{
throw new ArgumentNullException(“key”);
}
if (iv == null || iv.Length <= 0)
{
throw new ArgumentNullException(“key”);
}
string plaintext = null;
using (var rijAlg = new RijndaelManaged())
{
rijAlg.Mode = CipherMode.ECB;
rijAlg.Padding = PaddingMode.PKCS7;
rijAlg.FeedbackSize = 128;
rijAlg.Key = key;
rijAlg.IV = iv;
var decryptor = rijAlg.CreateDecryptor(rijAlg.Key, rijAlg.IV);
try
{
using (var msDecrypt = new MemoryStream(cipherText))
{
using (var csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
using (var srDecrypt = new StreamReader(csDecrypt))
{
plaintext = srDecrypt.ReadToEnd();
}
}
}
}
catch
{
plaintext = “keyError”;
}
}
return plaintext;
}
//加密資料
public static string EncryptStringAES(string cipherText)
{
var keybytes = Encoding.UTF8.GetBytes(“8080808080808080”); //自行設定
var iv = Encoding.UTF8.GetBytes(“8080808080808080”); //自行設定
var EncryptString = EncryptStringToBytes(cipherText, keybytes, iv);
var str = BitConverter.ToString(EncryptString).Replace(“-“, string.Empty).ToLower();
Console.WriteLine(“Hex=” + str+”\n”);
return Convert.ToBase64String(EncryptString);
}
private static byte[] EncryptStringToBytes(string plainText, byte[] key, byte[] iv)
{
if (plainText == null || plainText.Length <= 0)
{
throw new ArgumentNullException(“plainText”);
}
if (key == null || key.Length <= 0)
{
throw new ArgumentNullException(“key”);
}
if (iv == null || iv.Length <= 0)
{
throw new ArgumentNullException(“key”);
}
byte[] encrypted;
using (var rijAlg = new RijndaelManaged())
{
rijAlg.Mode = CipherMode.ECB;
rijAlg.Padding = PaddingMode.PKCS7;
rijAlg.FeedbackSize = 128;
rijAlg.Key = key;
rijAlg.IV = iv;
var encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);
using (var msEncrypt = new MemoryStream())
{
using (var csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
{
using (var swEncrypt = new StreamWriter(csEncrypt))
{
swEncrypt.Write(plainText);
}
encrypted = msEncrypt.ToArray();
}
}
}
return encrypted;
}
static void Pause()
{
Console.Write(“Press any key to continue . . . “);
Console.ReadKey(true);
}
static void Main(string[] args)
{
String Data = EncryptStringAES(“HELLOHELLOHELLOHELLOHELLOHELLOHELLOHELLOHELLOHELLOHELLOHELLOHELLOHELLOHELLOHELLO”);
Console.WriteLine(Data+”\n”);
Console.WriteLine(DecryptStringAES(Data)+”\n”);
//驗證比對網頁：http://www.seacha.com/tools/aes.html
Pause();
}
}
}
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