<em>Mac</em>Book项目 2009年学校开始实施<em>Mac</em>Book项目,所有师生配备一本<em>Mac</em>Book,并同步更新了校园无线网络。学校每周进行电脑技术更新,每月发送技术支持资料,极大改变了教学及学习方式。因此2011
2021-06-01 09:32:01
C#中實現AES演演算法加密解讀
2023-02-27 06:00:23
先上效果圖
檔案和加密檔案之間的轉換。
先新增輔助類
public class AES_EnorDecrypt
{
//定義預設金鑰
private static byte[] _aesKeyByte = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF, 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
private static string _aesKeyStr = Encoding.UTF8.GetString(_aesKeyByte);
/// <summary>
/// 隨機生成金鑰，預設金鑰長度為32，不足在加密時自動填充空格
/// </summary>
/// <param name="n">金鑰長度</param>
/// <returns></returns>
public static string GetIv(int n)
{
string s = "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
char[] arrChar = new char[s.Length];
for (int i = 0; i < s.Length; i++)
{
arrChar[i] = Convert.ToChar(s.Substring(i, 1));
}
StringBuilder num = new StringBuilder();
Random rnd = new Random(DateTime.Now.Millisecond);
for (int i = 0; i < n; i++)
{
num.Append(arrChar[rnd.Next(0, arrChar.Length)].ToString());
}
_aesKeyByte = Encoding.UTF8.GetBytes(num.ToString());
return _aesKeyStr = Encoding.UTF8.GetString(_aesKeyByte);
}
/// <summary>
/// AES加密，針對文字類檔案
/// </summary>
/// <param name="Data">被加密的明文</param>
/// <param name="Key">金鑰</param>
/// <param name="Vector">金鑰向量</param>
/// <returns>密文</returns>
public static string AESEncrypt(string Data, string Key, string Vector)
{
byte[] plainBytes = Encoding.UTF8.GetBytes(Data);
byte[] bKey = new byte[32];
Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length);
byte[] bVector = new byte[16];
Array.Copy(Encoding.UTF8.GetBytes(Vector.PadRight(bVector.Length)), bVector, bVector.Length);
byte[] Cryptograph = null;//加密後的密文
Rijndael Aes = Rijndael.Create();
try
{
using (MemoryStream Memory = new MemoryStream())
{
//把記憶體流物件包裝成加密流物件
using (CryptoStream Encryptor = new CryptoStream(Memory, Aes.CreateEncryptor(bKey, bVector), CryptoStreamMode.Write))
{
Encryptor.Write(plainBytes, 0, plainBytes.Length);
Encryptor.FlushFinalBlock();
Cryptograph = Memory.ToArray();
}
}
}
catch
{
Cryptograph = null;
}
return Convert.ToBase64String(Cryptograph);
}
/// <summary>
/// AES加密，任意檔案
/// </summary>
/// <param name="Data">被加密的明文</param>
/// <param name="Key">金鑰</param>
/// <param name="Vector">金鑰向量</param>
/// <returns>密文</returns>
public static byte[] AESEncrypt(byte[] Data, string Key, string Vector)
{
byte[] bKey = new byte[32];
Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length);
byte[] bVector = new byte[16];
Array.Copy(Encoding.UTF8.GetBytes(Vector.PadRight(bVector.Length)), bVector, bVector.Length);
byte[] Cryptograph = null;//加密後的密文
Rijndael Aes = Rijndael.Create();
try
{
using (MemoryStream Memory = new MemoryStream())
{
//把記憶體流物件包裝成加密流物件
using (CryptoStream Encryptor = new CryptoStream(Memory, Aes.CreateEncryptor(bKey, bVector), CryptoStreamMode.Write))
{
Encryptor.Write(Data, 0, Data.Length);
Encryptor.FlushFinalBlock();
Cryptograph = Memory.ToArray();
}
}
}
catch
{
Cryptograph = null;
}
return Cryptograph;
}
/// <summary>
/// AES解密，針對文字檔案
/// </summary>
/// <param name="Data">被解密的密文</param>
/// <param name="Key">金鑰</param>
/// <param name="Vector">金鑰向量</param>
/// <returns>明文</returns>
public static string AESDecrypt(string Data, string Key, string Vector)
{
byte[] encryptedBytes = Convert.FromBase64String(Data);
byte[] bKey = new byte[32];
Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length);
byte[] bVector = new byte[16];
Array.Copy(Encoding.UTF8.GetBytes(Vector.PadRight(bVector.Length)), bVector, bVector.Length);
byte[] original = null;//解密後的明文
Rijndael Aes = Rijndael.Create();
try
{
using (MemoryStream Memory = new MemoryStream(encryptedBytes))
{
//把記憶體流物件包裝成加密物件
using (CryptoStream Decryptor = new CryptoStream(Memory, Aes.CreateDecryptor(bKey, bVector), CryptoStreamMode.Read))
{
//明文儲存區
using (MemoryStream originalMemory = new MemoryStream())
{
byte[] Buffer = new byte[1024];
int readBytes = 0;
while ((readBytes = Decryptor.Read(Buffer, 0, Buffer.Length)) > 0)
{
originalMemory.Write(Buffer, 0, readBytes);
}
original = originalMemory.ToArray();
}
}
}
}
catch
{
original = null;
}
return Encoding.UTF8.GetString(original);
}
/// <summary>
/// AES解密，任意檔案
/// </summary>
/// <param name="Data">被解密的密文</param>
/// <param name="Key">金鑰</param>
/// <param name="Vector">金鑰向量</param>
/// <returns>明文</returns>
public static byte[] AESDecrypt(byte[] Data, string Key, string Vector)
{
byte[] bKey = new byte[32];
Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length);
byte[] bVector = new byte[16];
Array.Copy(Encoding.UTF8.GetBytes(Vector.PadRight(bVector.Length)), bVector, bVector.Length);
byte[] original = null;//解密後的明文
Rijndael Aes = Rijndael.Create();
try
{
using (MemoryStream Memory = new MemoryStream(Data))
{
//把記憶體流物件包裝成加密物件
using (CryptoStream Decryptor = new CryptoStream(Memory, Aes.CreateDecryptor(bKey, bVector), CryptoStreamMode.Read))
{
//明文儲存區
using (MemoryStream originalMemory = new MemoryStream())
{
byte[] Buffer = new byte[1024];
int readBytes = 0;
while ((readBytes = Decryptor.Read(Buffer, 0, Buffer.Length)) > 0)
{
originalMemory.Write(Buffer, 0, readBytes);
}
original = originalMemory.ToArray();
}
}
}
}
catch
{
original = null;
}
return original;
}
}
AES是塊加密，塊的長度是16位元組，如果原文不到16的位元組，就會進行填充至16個位元組。
開始實現
介面佈局
textbox1為檔案位置，textbox2為密碼。
設定好後
public partial class FormAes : Form
{
#region 屬性
private static string _aesKeyVector = "q2T_=R/*33vc";
#endregion
public FormAes()
{
InitializeComponent();
}
/// <summary>
/// 選擇檔案
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void textBox1_Click(object sender, EventArgs e)
{
OpenFileDialog dialog = new OpenFileDialog();
dialog.Multiselect = true;//該值確定是否可以選擇多個檔案
dialog.Title = "請選擇資料夾";
dialog.Filter = "所有檔案(*.*)|*.*";
if (dialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
textBox1.Text = dialog.FileName;
}
}
/// <summary>
/// 加密
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void button1_Click(object sender, EventArgs e)
{
if (string.IsNullOrWhiteSpace(textBox1.Text.Trim()) || string.IsNullOrWhiteSpace(textBox2.Text.Trim()))
return;
backgroundWorker1.RunWorkerAsync();
}
/// <summary>
/// 解密
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void button2_Click(object sender, EventArgs e)
{
if (string.IsNullOrWhiteSpace(textBox1.Text.Trim()) || string.IsNullOrWhiteSpace(textBox2.Text.Trim()))
return;
backgroundWorker2.RunWorkerAsync();
}
/// <summary>
/// 後臺執行緒執行的方法
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
string KeyVector = _aesKeyVector;//金鑰向量
string path = Path.GetDirectoryName(textBox1.Text);
string name = Path.GetFileName(textBox1.Text);
name += ".En";
#region 加密
FileStream sr = new FileStream(textBox1.Text, FileMode.Open, FileAccess.Read);
FileStream sw = new FileStream(path + "\" + name, FileMode.Create, FileAccess.Write);
if (sr.Length > 50 * 1024 * 1024)//如果檔案大於50M，採取分塊加密，按50MB讀寫
{
byte[] mybyte = new byte[52428800];//每50MB加密一次
int numBytesRead = 52428800;//每次加密的流大小
long leftBytes = sr.Length;//剩餘需要加密的流大小
long readBytes = 0;//已經讀取的流大小
//每50MB加密後會變成50MB+16B
byte[] encrpy = new byte[52428816];
while (true)
{
if (leftBytes > numBytesRead)
{
sr.Read(mybyte, 0, mybyte.Length);
encrpy = AES_EnorDecrypt.AESEncrypt(mybyte, textBox2.Text, KeyVector);
sw.Write(encrpy, 0, encrpy.Length);
leftBytes -= numBytesRead;
readBytes += numBytesRead;
backgroundWorker1.ReportProgress((int)(readBytes * 100 / sr.Length));
}
else//重新設定讀取流大小，避免最後多餘空值
{
byte[] newByte = new byte[leftBytes];
sr.Read(newByte, 0, newByte.Length);
byte[] newWriteByte;
newWriteByte = AES_EnorDecrypt.AESEncrypt(newByte, textBox2.Text, KeyVector);
sw.Write(newWriteByte, 0, newWriteByte.Length);
readBytes += leftBytes;
backgroundWorker1.ReportProgress((int)(readBytes * 100 / sr.Length));
break;
}
}
}
else
{
byte[] mybyte = new byte[sr.Length];
sr.Read(mybyte, 0, (int)sr.Length);
mybyte = AES_EnorDecrypt.AESEncrypt(mybyte, textBox2.Text, KeyVector);
sw.Write(mybyte, 0, mybyte.Length);
backgroundWorker1.ReportProgress(100);
}
sr.Close();
sw.Close();
#endregion
}
private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
progressBar1.Value = e.ProgressPercentage;
}
/// <summary>
/// 執行完成時觸發
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
MessageBox.Show("加密成功!");
}
/// <summary>
/// 後臺執行緒執行的方法
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void backgroundWorker2_DoWork(object sender, DoWorkEventArgs e)
{
try
{
string KeyVector = _aesKeyVector;//金鑰向量
string path = Path.GetDirectoryName(textBox1.Text);
string name = Path.GetFileName(textBox1.Text);
if (name.EndsWith(".En"))
{
name = name.Remove(name.Length - 3, 3);
}
#region 解密
FileStream sr = new FileStream(textBox1.Text, FileMode.Open, FileAccess.Read);
FileStream sw = new FileStream(path + "\" + name, FileMode.Create, FileAccess.Write);
if (sr.Length > 50 * 1024 * 1024)//如果檔案大於50M，採取分塊解密，按50MB讀寫
{
byte[] mybyte = new byte[52428816];//解密緩衝區50MB+16B
byte[] decrpt = new byte[52428800];//解密後的50MB
int numBytesRead = 52428816;//每次解密的流大小
long leftBytes = sr.Length;//剩餘需要解密的流大小
long readBytes = 0;//已經讀取的流大小
try
{
while (true)
{
if (leftBytes > numBytesRead)
{
sr.Read(mybyte, 0, mybyte.Length);
decrpt = AES_EnorDecrypt.AESDecrypt(mybyte, textBox2.Text, KeyVector);
sw.Write(decrpt, 0, decrpt.Length);
leftBytes -= numBytesRead;
readBytes += numBytesRead;
backgroundWorker2.ReportProgress((int)(readBytes * 100 / sr.Length));
}
else//重新設定讀取流大小，避免最後多餘空值
{
byte[] newByte = new byte[leftBytes];
sr.Read(newByte, 0, newByte.Length);
byte[] newWriteByte;
newWriteByte = AES_EnorDecrypt.AESDecrypt(newByte, textBox2.Text, KeyVector);
sw.Write(newWriteByte, 0, newWriteByte.Length);
readBytes += leftBytes;
backgroundWorker2.ReportProgress((int)(readBytes * 100 / sr.Length));
break;
}
}
}
catch
{
sr.Close();
sw.Close();
File.Delete(path + "\" + name);
e.Cancel = true;
}
sr.Close();
sw.Close();
}
else
{
byte[] mybyte = new byte[(int)sr.Length];
sr.Read(mybyte, 0, (int)sr.Length);
try
{
mybyte = AES_EnorDecrypt.AESDecrypt(mybyte, textBox2.Text, KeyVector);
sw.Write(mybyte, 0, mybyte.Length);
backgroundWorker2.ReportProgress(100);
}
catch
{
sr.Close();
sw.Close();
File.Delete(path + "\" + name);
e.Cancel = true;
}
sr.Close();
sw.Close();
}
#endregion
}
catch
{
e.Cancel = true;
}
}
private void backgroundWorker2_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
progressBar1.Value = e.ProgressPercentage;
}
/// <summary>
/// 執行完成時觸發
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void backgroundWorker2_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
if (e.Cancelled)
{
MessageBox.Show("解密失敗n密碼錯誤或加密檔案被篡改，無法解密");
}
else
{
MessageBox.Show("解密成功!");
}
}
}
總結
以上為個人經驗，希望能給大家一個參考，也希望大家多多支援it145.com。
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