using System;
using System.IO;
using System.Security;
using System.Security.Cryptography;
public class StoreCryptoStream : ICryptoStream {
static byte[] tag1 = {(byte)'[',(byte)'S',(byte)'a',(byte)'u' ,
(byte)'d' ,(byte)'e',(byte)'s' ,(byte)']'};
static byte[] tag2 = {(byte)'[',(byte)'S',(byte)'a',(byte)'u' ,
(byte)'r' ,(byte)'c',(byte)'2' ,(byte)']'};
FileStream fs;
public StoreCryptoStream(FileStream fout) {
fs = fout;
}
public virtual void CloseStream() { fs.Close(); }
public virtual void CloseStream(Object obj) { fs.Close(); }
public virtual void SetSink(ICryptoStream pstm) { }
public virtual void SetSource(CryptographicObject co) { }
public virtual ICryptoStream GetSink() { return null; }
public virtual void Write(byte[] bin) {
int len = bin.GetLength(0);
Write(bin, 0, len);
}
public virtual void Write(byte[] bin, int start, int len) {
fs.Write(bin, start, len);
}
}
public class MainClass {
static byte[] symKey;
static byte[] symIV;
private static bool GenerateKey(string password) {
try {
int len;
char[] cp = password.ToCharArray();
len = cp.GetLength(0);
byte[] bt = new byte[len];
for (int i = 0; i < len; i++) { bt[i] = (byte)cp[i]; } symKey = new byte[8]; symIV = new byte[8]; SHA1_CSP sha = new SHA1_CSP(); sha.Write(bt); sha.CloseStream(); for (int i = 0; i < 8; i++) { symKey[i] = sha.Hash[i]; } for (int i = 8; i < 16; i++) { symIV[i - 8] = sha.Hash[i]; } return true; } catch (Exception e) { Console.WriteLine("An Exception Occurred in Generating eys:" + e.ToString()); return false; } } private static void EncryptData(string infile, string outfile) { try { FileStream fin = new FileStream(infile, FileMode.Open, FileAccess.Read); FileStream fout = new FileStream(outfile, FileMode.OpenOrCreate, FileAccess.Write); fout.SetLength(0); byte[] bin = new byte[4096]; long totlen = fin.Length; long rdlen = 0; int len; SymmetricAlgorithm des = new DES_CSP(); StoreCryptoStream scs = new StoreCryptoStream(fout); SymmetricStreamEncryptor sse = des.CreateEncryptor(symKey, symIV); SHA1_CSP sha = new SHA1_CSP(); sse.SetSink(sha); sha.SetSource(sse); sha.SetSink(scs); scs.SetSource(sha); while (rdlen < totlen) { len = fin.Read(bin, 0, 4096); sse.Write(bin, 0, len); rdlen = rdlen + len; } sse.CloseStream(); fin.Close(); fout.Close(); } catch (Exception e) { Console.WriteLine("An exception occurred while encrypting :" + e.ToString()); } } public static void Main(string[] args) { GenerateKey(args[0]); EncryptData(args[1], args[2]); } } [/csharp]