C#对文件进行加密解密代码

加密代码

using system;
using system.io;
using system.security.cryptography;
  
public class example19_9
{
  public static void main()
  {
  
    // create a new file to work with
    filestream fsout = file.create(@"c:\temp\encrypted.txt");
  
    // create a new crypto provider
    tripledescryptoserviceprovider tdes =
      new tripledescryptoserviceprovider();
  
    // create a cryptostream to encrypt to the filestream
    cryptostream cs = new cryptostream(fsout, tdes.createencryptor(),
      cryptostreammode.write);
  
    // create a streamwriter to format the output
    streamwriter sw = new streamwriter(cs);
  
    // and write some data
    sw.writeline("'twas brillig, and the slithy toves");
    sw.writeline("did gyre and gimble in the wabe.");
    sw.flush();
    sw.close();
  
    // save the key and iv for future use
    filestream fskeyout = file.create(@"c:\\temp\encrypted.key");
  
    // use a binarywriter to write formatted data to the file
    binarywriter bw = new binarywriter(fskeyout);
  
    // write data to the file
    bw.write( tdes.key );
    bw.write( tdes.iv );
  
    // flush and close
    bw.flush();
    bw.close();
  
  }
  
}

解密代码如下

using system;
using system.io;
using system.security.cryptography;
  
public class example19_10
{
  public static void main()
  {
  
    // create a new crypto provider
    tripledescryptoserviceprovider tdes =
      new tripledescryptoserviceprovider();
  
    // open the file containing the key and iv
    filestream fskeyin = file.openread(@"c:\temp\encrypted.key");
  
    // use a binaryreader to read formatted data from the file
    binaryreader br = new binaryreader(fskeyin);
  
    // read data from the file and close it
    tdes.key = br.readbytes(24);
    tdes.iv = br.readbytes(8);
  
    // open the encrypted file
    filestream fsin = file.openread(@"c:\\temp\\encrypted.txt");
  
    // create a cryptostream to decrypt from the filestream
    cryptostream cs = new cryptostream(fsin, tdes.createdecryptor(),
      cryptostreammode.read);
  
    // create a streamreader to format the input
    streamreader sr = new streamreader(cs);
  
    // and decrypt the data
    console.writeline(sr.readtoend());
    sr.close();
  
  }
  
}

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