首先,需要在C#代码中添加System.Security.Cryptography命名空间,然后定义一个DES加密算法类使用的密钥和IV(初始化向量),并创建一个DES加密器对象,以便用于加密文件。
接下来,需要读取要加密的文件,并将其存储到内存流中。然后,使用加密器对象对数据进行处理,将加密后的数据写入新的文件中。最后,需要关闭加密器和内存流对象。
以下是一个示例代码:
using System.Security.Cryptography;
using System.IO;
namespace DESDemo
{
public class DESFileEncryption
{
private readonly byte[] Key;
private readonly byte[] IV;
public DESFileEncryption()
{
Key = new byte[] { 0x10, 0x01, 0x11, 0x20, 0x02, 0x12, 0x22, 0x03 };
IV = new byte[] { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08 };
}
public void EncryptFile(string inputFile, string outputFile)
{
using (DES desProvider = DES.Create())
{
desProvider.Key = Key;
desProvider.IV = IV;
using (FileStream inputFileStream = new FileStream(inputFile, FileMode.Open, FileAccess.Read))
{
using (FileStream outputFileStream = new FileStream(outputFile, FileMode.Create, FileAccess.Write))
{
using (ICryptoTransform encryptorTransform = desProvider.CreateEncryptor())
{
using (CryptoStream encryptStream = new CryptoStream(outputFileStream, encryptorTransform, CryptoStreamMode.Write))
{
byte[] buffer = new byte[8192];
int bytesRead;
do
{
bytesRead = inputFileStream.Read(buffer, 0, buffer.Length);
encryptStream.Write(buffer, 0, bytesRead);
} while (bytesRead != 0);
}
}
}
}
}
}
public void DecryptFile(string inputFile, string outputFile)
{
using (DES desProvider = DES.Create())
{
desProvider.Key = Key;
desProvider.IV = IV;
using (FileStream inputFileStream = new FileStream(inputFile, FileMode.Open, FileAccess.Read))
{
using (FileStream outputFileStream = new FileStream(outputFile, FileMode.Create, FileAccess.Write))
{
using (ICryptoTransform decryptorTransform = desProvider.CreateDecryptor())
{
using (CryptoStream decryptStream = new CryptoStream(inputFileStream, decryptorTransform, CryptoStreamMode.Read))
{
byte[] buffer = new byte[8192];
int bytesRead;
do
{
bytesRead = decryptStream.Read(buffer, 0, buffer.Length);
outputFileStream.Write(buffer, 0, bytesRead);
} while (bytesRead != 0);
}
}
}
}
}
}
}
}
在上面的示例代码中,我们已经定义了一个包含密钥和IV的DES加密算法类,该类提供了两种方法,用于加密或解密大文件,代码非常易于理解。可以使用以下代码来测试这些方法:
static void Main(string[] args)
{
DESFileEncryption desEncryption = new DESFileEncryption();
string inputFile = @"C:\path_to_your_input_file\input_file.txt";
string encryptedFile = @"C:\path_to_your_output_file\encrypted_file.enc";
string decryptedFile = @"C:\path_to_your_output_file\decrypted_file.txt";
desEncryption.EncryptFile(inputFile, encryptedFile);
desEncryption.DecryptFile(encryptedFile, decryptedFile);
}
以上就是使用C#通过DES加密算法加密大文件的方法以及示例代码。
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