public bool Encrypt(string src, string des, string pass, int et, int padMode, int ciMode)
{
SymmetricAlgorithm EncryptionType;
if (et == 0)
{
EncryptionType = new RijndaelManaged();
}
else
{
EncryptionType = new TripleDESCryptoServiceProvider();
}
//set padding mode
EncryptionType.Padding = padMode == 0 ? PaddingMode.PKCS7 : PaddingMode.ISO10126;
//set mode of operation
EncryptionType.Mode = ciMode == 0 ? CipherMode.CBC : CipherMode.CFB;
//generate random Initial Vector
EncryptionType.GenerateIV();
Tool t = new Tool();
var key = Encoding.ASCII.GetBytes(t.Expand(pass, EncryptionType.KeySize / 8));
EncryptionType.Key = key;
ICryptoTransform transform = EncryptionType.CreateEncryptor();
//prepare header
byte[] LenKey = new byte[4];
byte[] LenIV = new byte[4];
byte[] mPadMode = new byte[4];
byte[] mEncryptionType = new byte[4];
byte[] mModeOperation = new byte[4];
LenKey = BitConverter.GetBytes(EncryptionType.KeySize);
LenIV = BitConverter.GetBytes(EncryptionType.IV.Length);
mPadMode = BitConverter.GetBytes(padMode);
mEncryptionType = BitConverter.GetBytes(et);
mModeOperation = BitConverter.GetBytes(ciMode);
//write encrypted data to file
using (FileStream outFs = new FileStream(des, FileMode.Create))
{
outFs.Write(mEncryptionType, 0, 4);
outFs.Write(mModeOperation, 0, 4);
outFs.Write(mPadMode, 0, 4);
outFs.Write(LenKey, 0, 4);
outFs.Write(LenIV, 0, 4);
outFs.Write(EncryptionType.IV, 0, EncryptionType.IV.Length);
using (CryptoStream outStreamEncrypted = new CryptoStream(outFs, transform, CryptoStreamMode.Write))
{
int blockSizeBytes = EncryptionType.BlockSize / 8;
byte[] data = new byte[blockSizeBytes];
int bytesRead = 0;
int count = 0;
int offset = 0;
using (FileStream inFs = new FileStream(src, FileMode.Open))
{
do
{
count = inFs.Read(data, 0, blockSizeBytes);
offset += count;
outStreamEncrypted.Write(data, 0, count);
bytesRead += blockSizeBytes;
}while (count > 0);
inFs.Close();
}
outStreamEncrypted.FlushFinalBlock();
outStreamEncrypted.Close();
}
outFs.Close();
}
return(true);
}
