我要评论加密代码
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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