AES 文档加密器

很多时候要用到AES对文件加密，这里自己通过C#写了一个界面版的软件加密器，针对txt，word，和图片都有效。软件界面如图

核心代码如下：

namespace AESV
{public partial class 文档加密器 : Form{public 文档加密器(){InitializeComponent();}// 有密码的AES加密 public static byte[] Encrypt(byte[] toEncrypt, byte[] key){RijndaelManaged rDel = new RijndaelManaged();rDel.Key = key;rDel.Mode = CipherMode.ECB;rDel.Padding = PaddingMode.PKCS7;ICryptoTransform cTransform = rDel.CreateEncryptor();byte[] resultArray = cTransform.TransformFinalBlock(toEncrypt, 0, toEncrypt.Length);return resultArray;}// AES解密public static byte[] Decrypt(byte[] toDecrypt, byte[] key){RijndaelManaged rDel = new RijndaelManaged();rDel.Key = key;rDel.Mode = CipherMode.ECB;rDel.Padding = PaddingMode.None;ICryptoTransform cTransform = rDel.CreateDecryptor();byte[] resultArray = cTransform.TransformFinalBlock(toDecrypt, 0, toDecrypt.Length);return resultArray;}//加密的具体实现，有打开对话框和另存为对话框private void button1_Click(object sender, EventArgs e){SaveFileDialog saveFileDialog1 = new SaveFileDialog();saveFileDialog1.FileName = "默认文件名";saveFileDialog1.Filter = "默认文件名" + " 文件|*.txt";if (saveFileDialog1.ShowDialog() != DialogResult.OK)return;if (saveFileDialog1.FileName == null || saveFileDialog1.FileName.Length <= 0){MessageBox.Show("文件名不能为空");return;}const int chunkSize = 12800;//每次读取文件，只读取100Mbyte[] byteContent = new byte[chunkSize];OpenFileDialog openFileDialog1 = new OpenFileDialog();string key = textBox1.Text;MD5 md5Hasher = MD5.Create();byte[] cKey = md5Hasher.ComputeHash(Encoding.Default.GetBytes(key));if (openFileDialog1.ShowDialog() == DialogResult.OK){if (File.Exists(openFileDialog1.FileName)){FileStream files = new FileStream(openFileDialog1.FileName, FileMode.Open);int lengthToRead = (int)files.Length;int lengthleft = lengthToRead;int lengthadd = 0;int round = (int)Math.Ceiling ((double)lengthToRead / (double)chunkSize);DateTime dt1 = DateTime.Now;FileStream fs = new FileStream(saveFileDialog1.FileName, FileMode.Create); if (lengthToRead > 0&lengthleft>0)//加密的时间{for (int i = 0; i <round; i++){if (lengthleft < chunkSize&lengthleft>0){byte[] byteShort = new byte[lengthleft];files.Read(byteShort, 0, lengthleft);byte[] enByte = Encrypt(byteShort, cKey);fs.Seek(lengthadd,SeekOrigin.Begin);fs.Write(enByte, 0, enByte.Length);}else{files.Read(byteContent, 0, chunkSize);byte[] enByte = Encrypt(byteContent, cKey);fs.Seek(lengthadd, SeekOrigin.Begin);fs.Write(enByte, 0, byteContent.Length);//write(byte,position,num)从第position个位置选取num个数放入程序内存中。}lengthadd += chunkSize;lengthleft -= chunkSize;/*    int j = 0;j++;MessageBox.Show("运行的次数为：" + j);*/}}fs.Close();files.Close();DateTime dt2 = DateTime.Now;TimeSpan dt = dt2.Subtract(dt1);string dtd = dt.ToString();MessageBox.Show("加密的时间为：" + dtd);}}}private void button2_Click(object sender, EventArgs e){SaveFileDialog saveFileDialog2 = new SaveFileDialog();saveFileDialog2.FileName = "默认文件名";saveFileDialog2.Filter = "默认文件名" + " 文件|*.txt";if (saveFileDialog2.ShowDialog() != DialogResult.OK)return;if (saveFileDialog2.FileName == null || saveFileDialog2.FileName.Length <= 0){MessageBox.Show("文件名不能为空");return;}const int chunkSize = 12800;//每次读取文件，只读取100Kbyte[] byteContent = new byte[chunkSize];OpenFileDialog openFileDialog2 = new OpenFileDialog();string key = textBox1.Text;MD5 md5Hasher = MD5.Create();byte[] cKey = md5Hasher.ComputeHash(Encoding.Default.GetBytes(key));if (openFileDialog2.ShowDialog() == DialogResult.OK){if (File.Exists(openFileDialog2.FileName)){FileStream files = new FileStream(openFileDialog2.FileName, FileMode.OpenOrCreate); int lengthToRead = (int)files.Length;int lengthleft = lengthToRead;int lengthadd = 0;int round = (int)Math.Ceiling((double)lengthToRead / (double)chunkSize);//解密的时间FileStream fs = new FileStream(saveFileDialog2.FileName, FileMode.Create);DateTime dt1 = DateTime.Now;if (lengthToRead > 0 & lengthleft > 0)//加密的时间{for (int i = 0; i < round; i++){if (lengthleft < chunkSize & lengthleft > 0){byte[] byteShort = new byte[lengthleft];files.Read(byteShort, 0, lengthleft);byte[] enByte = Decrypt(byteShort, cKey);fs.Seek(lengthadd, SeekOrigin.Begin);if (i == round -1)fs.Write(enByte, 0, enByte.Length - 16 + lengthToRead % 16);elsefs.Write(enByte, 0, enByte.Length);//write(byte,position,num)从第position个位置选取num个数放入程序内存中。lengthadd += chunkSize;}else{files.Read(byteContent, 0, chunkSize);byte[] enByte =Decrypt(byteContent, cKey);fs.Seek(lengthadd , SeekOrigin.Begin);fs.Write(enByte, 0, byteContent.Length);//write(byte,position,num)从第position个位置选取num个数放入程序内存中。lengthadd += chunkSize;}lengthleft -= chunkSize;}}fs.Close();files.Close();//此处使用AES-128-ECB加密模式，key需要为16位。DateTime dt2 = DateTime.Now;TimeSpan dt = dt2.Subtract(dt1);string dtd = dt.ToString();MessageBox.Show("解密的时间为：" + dtd);}}}public object Flase { get; set; }private void textBox1_TextChanged(object sender, EventArgs e){TextBox TextBox1 = sender as TextBox;TextBox1.PasswordChar = '*';TextBox1.MaxLength = 16;textBox1.TextAlign = HorizontalAlignment.Center;}private void label1_Click(object sender, EventArgs e){}}//类结束；
}//命名空间结束；

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