private void InputData()
{
/*numericUpDown1.Value =20;
textBox5.Text = "2";
textBox2.Text = "1023";
textBox3.Text = "32";
textBox4.Text = "0";*/
ulong x0 = Convert.ToUInt64(textBox5.Text);
ulong m = Convert.ToUInt64(textBox2.Text);
ulong a = Convert.ToUInt64(textBox3.Text);
ulong c = Convert.ToUInt64(textBox4.Text);
_myRandom = new MyRandom(x0, m, a, c);
}
private void EncryptStream(Stream inputStream, Stream outputStream)
{
byte[] key = _mKey;
var s = GenerateSubKeys(key);
ushort a0 = 0, b0 = 0, a, b;
MyRandom myRandom = new MyRandom(31, 2147483647, 16807, 17711);
a0 = (ushort) myRandom.random();//generate random a and b
b0 = (ushort) myRandom.random();
int w2 = (_mW << 1);
var buffer = new byte[w2];//buffer of a and b
inputStream.Position = 0;
outputStream.Position = 0;
int paddingLength = 0;
int readBytesCount;
do
{//main cycle
readBytesCount = inputStream.Read(buffer, 0, w2);
if (readBytesCount == 0)
break;
a = BitConverter.ToUInt16(buffer, 0);//get a
b = BitConverter.ToUInt16(buffer, _mW);//get b
EncryptBlock(ref a0, ref b0, ref a, ref b, s);
outputStream.Write(BitConverter.GetBytes(a0), 0, _mW);
outputStream.Write(BitConverter.GetBytes(b0), 0, _mW);
if (readBytesCount < w2)//if the last block < w2
paddingLength = w2 - readBytesCount;//fill padding by random bytes
if (OnProgressChanged != null)//calculate progress
OnProgressChanged((int)(inputStream.Position / (float)inputStream.Length * 100));
} while (true);
int countOfPaddingBlocks = _mKey.Length + 1;//space on md5 + length of prev padding
countOfPaddingBlocks = countOfPaddingBlocks / w2 + (countOfPaddingBlocks / w2 > 0 ? 1 : 0);
buffer = new byte[w2 * countOfPaddingBlocks];
_mKey.CopyTo(buffer, 0);//password md5 padding
buffer[buffer.Length - 1] = (byte)paddingLength;//padding length
for (int i = 0; i < countOfPaddingBlocks; ++i)//padding filler
{
a = BitConverter.ToUInt16(buffer, i * w2);
b = BitConverter.ToUInt16(buffer, i * w2 + _mW);
EncryptBlock(ref a0, ref b0, ref a, ref b, s);
outputStream.Write(BitConverter.GetBytes(a), 0, _mW);
outputStream.Write(BitConverter.GetBytes(b), 0, _mW);
}
if (OnProgressChanged != null)
OnProgressChanged(100);
}
public MyRC5(uint numberOfRounds, KeyLength keyLength, uint wordLength)
{
_numberOfRounds = (int) numberOfRounds;
//_keyLength = keyLength;
_wordLength = wordLength;
switch (keyLength)
{
case KeyLength.KEY_LENGTH_16:
_pw = P_16;
_qw = Q_16;
break;
case KeyLength.KEY_LENGTH_32:
_pw = P_32;
_qw = Q_32;
break;
case KeyLength.KEY_LENGTH_64:
_pw = P_64;
_qw = Q_64;
break;
}
_myRandom = new MyRandom(31, 2147483647, 16807, 17711);
_myMd5 = new MyMD5();
}
private bool DecryptStream(Stream inputStream, Stream outputStream)
{
byte[] key = _mKey; //key in byte format
var s = GenerateSubKeys(key);
ushort a0 = 0, b0 = 0, a, b;
MyRandom myRandom = new MyRandom(31, 2147483647, 16807, 17711);
a0 = (ushort) myRandom.random();//generate random a and b
b0 = (ushort) myRandom.random();
int w2 = _mW << 1, i, l = _mKey.Length + 1;
var buffer = new byte[w2];
inputStream.Position = 0;
outputStream.Position = 0;
l = l / w2 + (l / w2 > 0 ? 1 : 0);//number of padding blocks
do
{
inputStream.Read(buffer, 0, w2);
a = BitConverter.ToUInt16(buffer, 0);
b = BitConverter.ToUInt16(buffer, _mW);
DecryptBlock(ref a0, ref b0, ref a, ref b, s);
outputStream.Write(BitConverter.GetBytes(a), 0, _mW);
outputStream.Write(BitConverter.GetBytes(b), 0, _mW);
if (OnProgressChanged != null)//calculate progress
OnProgressChanged((int)(inputStream.Position / (float)inputStream.Length * 100));
} while (inputStream.Position < inputStream.Length - l * w2 - w2);
byte[] padding = new byte[l * w2 + w2];
MemoryStream paddingStream = new MemoryStream(padding);
paddingStream.Position = 0;
do
{
inputStream.Read(buffer, 0, w2); //padding
a = BitConverter.ToUInt16(buffer, 0);
b = BitConverter.ToUInt16(buffer, _mW);
DecryptBlock(ref a0, ref b0, ref a, ref b, s);
paddingStream.Write(BitConverter.GetBytes(a), 0, _mW);
paddingStream.Write(BitConverter.GetBytes(b), 0, _mW);
} while (inputStream.Position < inputStream.Length);
for (i = 0; i < _mKey.Length; ++i)//check md5
{//16-31 password md5
if (_mKey[i] != padding[i + 16/4])
{
//MessageBox.Show("not right password");
if (OnDecryptedPasswordFailed != null)
OnDecryptedPasswordFailed();
return false;
}
}
int len = padding[padding.Length - 1];
outputStream.Write(padding, 0, w2 - len);
if (OnProgressChanged != null)//calculate process
OnProgressChanged(100);
return true;
}
