/**
* Create a buffered block cipher without padding.
*
* @param cipher the underlying block cipher this buffering object wraps.
* @param padded true if the buffer should add, or remove, pad bytes,
* false otherwise.
*/
public BufferedBlockCipher(
BlockCipher cipher)
{
this.cipher = cipher;
buf = new byte[cipher.getBlockSize()];
bufOff = 0;
//
// check if we can handle partial blocks on doFinal.
//
String name = cipher.getAlgorithmName();
int idx = name.IndexOf('/') + 1;
pgpCFB = (idx > 0 && name.Substring(idx).StartsWith("PGP"));
if (pgpCFB)
{
partialBlockOkay = true;
}
else
{
partialBlockOkay = (idx > 0 && (name.Substring(idx).StartsWith("CFB") ||
name.Substring(idx).StartsWith("OFB")));
}
}
private int DecryptBlock(
byte[] input,
int inOff,
byte[] outBytes,
int outOff)
{
input.DeepCopy_NoChecks(inOff, _cbcNextV, 0, CipherBlockSize);
int length = BlockCipher.ProcessBlock(input, inOff, outBytes, outOff);
/*
* XOR the cbcV and the output
*/
outBytes.XorInPlaceInternal(outOff, _cbcV, 0, CipherBlockSize);
/*
* swap the back up buffer into next position
*/
byte[] tmp;
tmp = _cbcV;
_cbcV = _cbcNextV;
_cbcNextV = tmp;
return(length);
}
/// <summary>
/// Creates a configuration for key confirmation using an CMAC/OMAC1 construction.
/// </summary>
/// <param name="cipherEnum">Block cipher to use as basis of CMAC construction.</param>
/// <returns>A key confirmation configuration as a <see cref="AuthenticationConfiguration"/>.</returns>
public static AuthenticationConfiguration GenerateConfiguration(BlockCipher cipherEnum)
{
int outputSize;
var config = AuthenticationConfigurationFactory.CreateAuthenticationConfigurationCmac(cipherEnum, out outputSize);
return(config);
}
/// <summary>
/// Reset the chaining vector back to the IV and reset the underlying cipher.
/// </summary>
public override void Reset()
{
Array.Copy(IV, 0, _cfbV, 0, IV.Length);
_cfbOutV.SecureWipe();
BlockCipher.Reset();
}
/**
* create a standard MAC based on a block cipher with the size of the
* MAC been given in bits. This class uses CFB mode as the basis for the
* MAC generation.
* <p>
* Note: the size of the MAC must be at least 24 bits (FIPS Publication 81),
* or 16 bits if being used as a data authenticator (FIPS Publication 113),
* and in general should be less than the size of the block cipher as it reduces
* the chance of an exhaustive attack (see Handbook of Applied Cryptography).
*
* @param cipher the cipher to be used as the basis of the MAC generation.
* @param cfbBitSize the size of an output block produced by the CFB mode.
* @param macSizeInBits the size of the MAC in bits, must be a multiple of 8.
*/
public CFBBlockCipherMac(
BlockCipher cipher,
int cfbBitSize,
int macSizeInBits)
: this(cipher, cfbBitSize, macSizeInBits, null)
{
}
public static void Initialize()
{
if (IsOpen || ListeningThread != null)
{
return;
}
ushort port = (ushort)Configuration.General["Master Port"];
Sock = new UdpClient(Configuration.General["Master Addr"], port);
// TODO figure out what this has to do with ICMP (in server too)
uint IOC_IN = 0x80000000,
IOC_VENDOR = 0x18000000,
SIO_UDP_CONNRESET = IOC_IN | IOC_VENDOR | 0xC;
Sock.Client.IOControl((int)SIO_UDP_CONNRESET, new byte[] { 0 }, null);
Key = new Key();
Encryptor = null;
IsOpen = true;
ListeningThread = new Thread(Listener);
ListeningThread.Start();
}
/**
* Basic constructor.
*
* @param c the block cipher to be used.
*/
public SICBlockCipher(BlockCipher c)
{
this.cipher = c;
this.blockSize = cipher.getBlockSize();
this.IV = new byte[blockSize];
this.counter = new byte[blockSize];
this.counterOut = new byte[blockSize];
}
public BlockSizeException(BlockCipher cipherEnum, int requestedSizeBits)
: base(String.Format("The size {0} is not supported for use with the {1} cipher.", requestedSizeBits,
Athena.Cryptography.BlockCiphers[cipherEnum].DisplayName))
{
RequestedSize = requestedSizeBits;
Mode = cipherEnum;
AllowedSizes = Athena.Cryptography.BlockCiphers[cipherEnum].AllowableBlockSizesBits.ToList();
}
/**
* basic constructor.
*
* @param cipher the block cipher to be wrapped.
* @exception IllegalArgumentException if the cipher has a block size other than
* one.
*/
public StreamBlockCipher(
BlockCipher cipher)
{
if (cipher.getBlockSize() != 1)
{
throw new ArgumentException("block cipher block size != 1.");
}
this.cipher = cipher;
}
/**
* Basic constructor.
*
* @param cipher the block cipher to be used as the basis of chaining.
*/
public CBCBlockCipher(
BlockCipher cipher)
{
this.cipher = cipher;
this.blockSize = cipher.getBlockSize();
this.IV = new byte[blockSize];
this.cbcV = new byte[blockSize];
this.cbcNextV = new byte[blockSize];
}
/**
* Create a buffered block cipher with the desired padding.
*
* @param cipher the underlying block cipher this buffering object wraps.
* @param padding the padding type.
*/
public PaddedBufferedBlockCipher(
BlockCipher cipher,
BlockCipherPadding padding)
{
this.cipher = cipher;
this.padding = padding;
buf = new byte[cipher.getBlockSize()];
bufOff = 0;
}
/// <summary>
/// Reset the cipher to the same state as it was after the last init (if there was one).
/// </summary>
public override void Reset()
{
if (IV != null)
{
Array.Copy(IV, 0, _cbcV, 0, IV.Length);
}
_cbcNextV.SecureWipe();
BlockCipher.Reset();
}
/// <inheritdoc />
protected override void InitState(byte[] key)
{
// Prepend the supplied IV with zeros (as per FIPS PUB 81)
byte[] workingIv = new byte[CipherBlockSize];
IV.DeepCopy_NoChecks(0, workingIv, CipherBlockSize - IV.Length, IV.Length);
Array.Clear(workingIv, 0, CipherBlockSize - IV.Length);
IV = workingIv;
Reset();
BlockCipher.Init(true, key); // Streaming mode - cipher always used in encryption mode
}
/**
* Basic constructor.
*
* @param cipher the block cipher to be used as the basis of the
* feedback mode.
* @param blockSize the block size in bits (note: a multiple of 8)
*/
public CFBBlockCipher(
BlockCipher cipher,
int bitBlockSize)
{
this.cipher = cipher;
this.blockSize = bitBlockSize / 8;
this.IV = new byte[cipher.getBlockSize()];
this.cfbV = new byte[cipher.getBlockSize()];
this.cfbOutV = new byte[cipher.getBlockSize()];
}
protected override BlockCipher EncryptBlock(BlockCipher block)
{
uint uint32_1 = BitConverter.ToUInt32(block.ToBytesArray(), 0);
uint uint32_2 = BitConverter.ToUInt32(block.ToBytesArray(), 4);
uint num1 = 0;
uint num2 = 32;
while (num2-- > 0U)
{
}
return(new BlockCipher((DWord)uint32_1, (DWord)uint32_2));
}
private void btnSaveStream_Click(object sender, RoutedEventArgs e)
{
SaveFileDialog saveFileDialog = new SaveFileDialog();
saveFileDialog.Filter = "Image files (*.png;*.jpg;*.jpeg)|*.png;*.jpg;*.jpeg";
saveFileDialog.InitialDirectory = System.AppDomain.CurrentDomain.BaseDirectory;
if (saveFileDialog.ShowDialog() == true)
{
File.WriteAllBytes(saveFileDialog.FileName, BlockCipher.imageToByteArray(_encryptedBitmap));
}
}
/// <summary>
/// Instantiates and returns an implementation of the requested symmetric block cipher.
/// </summary>
/// <returns>A <see cref="BlockCipherBase" /> cipher object implementing the relevant cipher algorithm.</returns>
public static BlockCipherBase CreateBlockCipher(BlockCipher cipherEnum, int?blockSize = null)
{
if (cipherEnum == BlockCipher.None)
{
throw new ArgumentException("Cipher set to None.", "cipherEnum",
new InvalidOperationException("Cannot instantiate null block cipher."));
}
if (blockSize == null)
{
blockSize = Athena.Cryptography.BlockCiphers[cipherEnum].DefaultBlockSizeBits;
}
return(EngineInstantiatorsBlock[cipherEnum](blockSize.Value));
}
private int EncryptBlock(
byte[] input,
int inOff,
byte[] outBytes,
int outOff)
{
BlockCipher.ProcessBlock(_cfbV, 0, _cfbOutV, 0);
// XOR the cfbV with the plaintext producing the ciphertext
input.XorInternal(inOff, _cfbOutV, 0, outBytes, outOff, _feedbackSize);
// change over the input block.
Array.Copy(_cfbV, _feedbackSize, _cfbV, 0, _cfbV.Length - _feedbackSize);
Array.Copy(outBytes, outOff, _cfbV, _cfbV.Length - _feedbackSize, _feedbackSize);
return(_feedbackSize);
}
/// <inheritdoc />
internal override int ProcessBlockInternal(byte[] input, int inOff, byte[] output, int outOff)
{
BlockCipher.ProcessBlock(_ofbV, 0, _ofbOutV, 0);
// XOR the ofbV with the plaintext producing the cipher text (and
// the next input block).
input.XorInternal(inOff, _ofbOutV, 0, output, outOff, CipherBlockSize);
// change over the input block.
Array.Copy(_ofbV, CipherBlockSize, _ofbV, 0, _ofbV.Length - CipherBlockSize);
Array.Copy(_ofbOutV, 0, _ofbV, _ofbV.Length - CipherBlockSize, CipherBlockSize);
return(CipherBlockSize);
}
/// <summary>
/// Create a configuration for a block cipher.
/// </summary>
/// <param name="cipher">Block cipher to use.</param>
/// <param name="mode">Mode of operation for the cipher.</param>
/// <param name="padding">Padding scheme to use with the mode, where necessary (e.g. CBC).</param>
/// <param name="keySize">Key size to use, in bits.</param>
/// <param name="blockSize">Cipher block size to use, in bits.</param>
/// <returns>Block cipher configuration DTO.</returns>
public static CipherConfiguration CreateBlockCipherConfiguration(BlockCipher cipher,
BlockCipherMode mode, BlockCipherPadding padding, int?keySize = null, int?blockSize = null)
{
var config = new CipherConfiguration {
Type = CipherType.Block
};
// Set the key size
int keySizeNonNull = keySize ?? Athena.Cryptography.BlockCiphers[cipher].DefaultKeySizeBits;
if (keySize == null || Athena.Cryptography.BlockCiphers[cipher].AllowableKeySizesBits.Contains(keySizeNonNull))
{
config.KeySizeBits = keySizeNonNull;
}
else
{
throw new CipherKeySizeException(cipher, keySizeNonNull);
}
// Set the block size
int blockSizeNonNull = blockSize ?? Athena.Cryptography.BlockCiphers[cipher].DefaultBlockSizeBits;
if (blockSize == null ||
Athena.Cryptography.BlockCiphers[cipher].AllowableBlockSizesBits.Contains(blockSizeNonNull))
{
config.BlockSizeBits = blockSizeNonNull;
}
else
{
throw new BlockSizeException(cipher, blockSizeNonNull);
}
// Set the mode
if (Athena.Cryptography.BlockCipherModes[mode].PaddingRequirement == PaddingRequirement.Always &&
padding == BlockCipherPadding.None)
{
throw new ArgumentException(mode +
" mode must be used with padding or errors will occur when plaintext length is not equal to or a multiple of the block size.");
}
config.ModeName = mode.ToString();
config.PaddingName = padding.ToString();
config.CipherName = cipher.ToString();
config.InitialisationVector = new byte[config.BlockSizeBits.Value / 8];
StratCom.EntropySupplier.NextBytes(config.InitialisationVector);
return(config);
}
protected override BlockCipher DecryptBlock(BlockCipher block)
{
uint uint32_1 = BitConverter.ToUInt32(block.ToBytesArray(), 0);
uint uint32_2 = BitConverter.ToUInt32(block.ToBytesArray(), 4);
uint num1 = 3337565984;
uint num2 = 32;
while (num2-- > 0U)
{
//uint32_2 -= (uint)(((int)uint32_1 << 4 ^ (int)(uint32_1 >> 5)) + (int)uint32_1 ^ (int)num1 + (int)this._realedKey[(IntPtr)(num1 >> 11 & 3U)]);
//num1 -= 2654435769U;
//uint32_1 -= (uint)(((int)uint32_2 << 4 ^ (int)(uint32_2 >> 5)) + (int)uint32_2 ^ (int)num1 + (int)this._realedKey[(IntPtr)(num1 & 3U)]);
}
return(new BlockCipher((DWord)uint32_1, (DWord)uint32_2));
}
/// <inheritdoc />
internal override int ProcessBlockInternal(byte[] input, int inOff, byte[] output, int outOff)
{
BlockCipher.ProcessBlock(_counter, 0, _counterOut, 0);
// XOR the counterOut with the plaintext producing the cipher text
input.XorInternal(inOff, _counterOut, 0, output, outOff, CipherBlockSize);
// Increment the counter
int j = CipherBlockSize;
while (--j >= 0 && ++_counter[j] == 0)
{
}
return(CipherBlockSize);
}
/// <summary>
/// Creates a Poly1305 primitive using a symmetric block cipher primitive (cipher must have a block size of 128 bits).
/// If salt is used, it is applied as: salt||message, where || is concatenation.
/// </summary>
/// <param name="cipherEnum">Cipher primitive to use as the basis for the Poly1305 construction.</param>
/// <param name="key">Cryptographic key to use in the MAC operation.</param>
/// <param name="nonce">Initialisation vector/nonce. Required.</param>
/// <param name="salt">Cryptographic salt to use in the MAC operation, if any.</param>
/// <returns>Pre-initialised Poly1305 MAC primitive as a <see cref="IMac" />.</returns>
public static IMac CreatePoly1305Primitive(BlockCipher cipherEnum, byte[] key, byte[] nonce, byte[] salt = null)
{
if (Athena.Cryptography.BlockCiphers[cipherEnum].DefaultBlockSizeBits != 128)
{
throw new NotSupportedException();
}
var macObj = new Poly1305Mac(CipherFactory.CreateBlockCipher(cipherEnum));
macObj.Init(key, nonce);
if (salt.IsNullOrZeroLength() == false)
{
macObj.BlockUpdate(salt, 0, salt.Length);
}
return(macObj);
}
/// <summary>
/// Creates a CMAC primitive using a symmetric block cipher primitive configured with default block size.
/// Default block sizes (and so, output sizes) can be found by querying <see cref="Athena" />.
/// </summary>
/// <param name="cipherEnum">
/// Cipher primitive to use as the basis for the CMAC construction. Block size must be 64 or 128
/// bits.
/// </param>
/// <param name="key">Cryptographic key to use in the MAC operation.</param>
/// <param name="salt">Cryptographic salt to use in the MAC operation, if any.</param>
/// <returns>Pre-initialised CMAC primitive as a <see cref="IMac" />.</returns>
public static IMac CreateCmacPrimitive(BlockCipher cipherEnum, byte[] key, byte[] salt = null)
{
int?defaultBlockSize = Athena.Cryptography.BlockCiphers[cipherEnum].DefaultBlockSizeBits;
if (defaultBlockSize != 64 && defaultBlockSize != 128)
{
throw new NotSupportedException("CMAC/OMAC1 only supports ciphers with 64 / 128 bit block sizes.");
}
var macObj = new CMac(CipherFactory.CreateBlockCipher(cipherEnum, null));
macObj.Init(key);
if (salt.IsNullOrZeroLength() == false)
{
macObj.BlockUpdate(salt, 0, salt.Length);
}
return(macObj);
}
/**
* create a standard MAC based on a block cipher with the size of the
* MAC been given in bits. This class uses CBC mode as the basis for the
* MAC generation.
* <p>
* Note: the size of the MAC must be at least 24 bits (FIPS Publication 81),
* or 16 bits if being used as a data authenticator (FIPS Publication 113),
* and in general should be less than the size of the block cipher as it reduces
* the chance of an exhaustive attack (see Handbook of Applied Cryptography).
*
* @param cipher the cipher to be used as the basis of the MAC generation.
* @param macSizeInBits the size of the MAC in bits, must be a multiple of 8.
* @param padding the padding to be used to complete the last block.
*/
public CBCBlockCipherMac(
BlockCipher cipher,
int macSizeInBits,
BlockCipherPadding padding)
{
if ((macSizeInBits % 8) != 0)
{
throw new ArgumentException("MAC size must be multiple of 8");
}
this.cipher = new CBCBlockCipher(cipher);
this.padding = padding;
this.macSize = macSizeInBits / 8;
mac = new byte[cipher.getBlockSize()];
buf = new byte[cipher.getBlockSize()];
bufOff = 0;
}
private int EncryptBlock(
byte[] input,
int inOff,
byte[] outBytes,
int outOff)
{
/*
* XOR the cbcV and the input,
* then encrypt the cbcV
*/
_cbcV.XorInPlaceInternal(0, input, inOff, CipherBlockSize);
int length = BlockCipher.ProcessBlock(_cbcV, 0, outBytes, outOff);
/*
* copy ciphertext to cbcV
*/
outBytes.DeepCopy_NoChecks(outOff, _cbcV, 0, _cbcV.Length);
return(length);
}
private void btnDecrypt_Click(object sender, RoutedEventArgs e)
{
try
{
CipherMode mode = CipherMode.CBC;
if ((bool)rbEncryptionModeCBC.IsChecked)
{
mode = CipherMode.CBC;
}
else if ((bool)rbEncryptionModeECB.IsChecked)
{
mode = CipherMode.ECB;
}
Drawing.Image decryptedImg = BlockCipher.DecryptImage(_encryptedBitmap, mode);
SetWpfImageFromImage(decryptedImg, imgDisplay);
btnDecrypt.IsEnabled = false;
}
catch (Exception ex)
{
throw ex;
}
}
private void btnEncrypt_Click(object sender, RoutedEventArgs e)
{
try
{
CipherMode mode = CipherMode.CBC;
if ((bool)rbEncryptionModeCBC.IsChecked)
{
mode = CipherMode.CBC;
}
else if ((bool)rbEncryptionModeECB.IsChecked)
{
mode = CipherMode.ECB;
}
_encryptedBitmap = BlockCipher.EncryptImage(_blockFilePath, mode);
SetWpfImageFromImage(_encryptedBitmap, imgDisplay);
btnDecrypt.IsEnabled = true;
}
catch (Exception ex)
{
throw ex;
}
}
protected override BlockCipher DecryptBlock(BlockCipher block)
{
uint uint32_1 = BitConverter.ToUInt32(block.ToBytesArray(), 0);
uint uint32_2 = BitConverter.ToUInt32(block.ToBytesArray(), 4);
uint ui1 = uint32_1 ^ this._pBox[17];
uint ui2 = uint32_2 ^ (this.F(ui1) ^ this._pBox[16]);
uint ui3 = ui1 ^ (this.F(ui2) ^ this._pBox[15]);
uint ui4 = ui2 ^ (this.F(ui3) ^ this._pBox[14]);
uint ui5 = ui3 ^ (this.F(ui4) ^ this._pBox[13]);
uint ui6 = ui4 ^ (this.F(ui5) ^ this._pBox[12]);
uint ui7 = ui5 ^ (this.F(ui6) ^ this._pBox[11]);
uint ui8 = ui6 ^ (this.F(ui7) ^ this._pBox[10]);
uint ui9 = ui7 ^ (this.F(ui8) ^ this._pBox[9]);
uint ui10 = ui8 ^ (this.F(ui9) ^ this._pBox[8]);
uint ui11 = ui9 ^ (this.F(ui10) ^ this._pBox[7]);
uint ui12 = ui10 ^ (this.F(ui11) ^ this._pBox[6]);
uint ui13 = ui11 ^ (this.F(ui12) ^ this._pBox[5]);
uint ui14 = ui12 ^ (this.F(ui13) ^ this._pBox[4]);
uint ui15 = ui13 ^ (this.F(ui14) ^ this._pBox[3]);
uint ui16 = ui14 ^ (this.F(ui15) ^ this._pBox[2]);
uint num = ui15 ^ (this.F(ui16) ^ this._pBox[1]);
return(new BlockCipher((DWord)(ui16 ^ this._pBox[0]), (DWord)num));
}
public void TestTransform()
{
BlockCipher cipher1 = new BlockCipher();
BlockCipher cipher2 = new BlockCipher();
byte[] bytes1 = cipher1.InitializeHandshake();
byte[] bytes2 = cipher2.InitializeHandshake();
bytes1 = cipher2.Handshake(bytes1);
bytes2 = cipher1.Handshake(bytes2);
cipher1.FinalizeHandshake(bytes1);
cipher2.FinalizeHandshake(bytes2);
var buffer = new x2net.Buffer();
string text = new String('x', 5300);
Assert.Equal(5300, text.Length);
/*
* buffer.Write(1);
* buffer.Write(text);
* buffer.Shrink(1);
*/
cipher1.Transform(buffer, (int)buffer.Length);
cipher2.InverseTransform(buffer, (int)buffer.Length);
buffer.Rewind();
/*
* string result;
* buffer.Read(out result);
*
* Assert.AreEqual(text, result);
*/
}
/// <summary>
/// Initializes the specified cipher mode.
/// </summary>
/// <param name="cipher">The cipher.</param>
internal void Init(BlockCipher cipher)
{
this.Cipher = cipher;
this._blockSize = cipher.BlockSize;
this.IV = this.IV.Take(this._blockSize).ToArray();
}
/// <summary>
/// Initializes the specified cipher mode.
/// </summary>
/// <param name="cipher">The cipher.</param>
internal void Init(BlockCipher cipher)
{
Cipher = cipher;
_blockSize = cipher.BlockSize;
IV = IV.Take(_blockSize);
}
public IBlockCipher GetBlockCipher(BlockCipher cipher)
{
return BlockCipherBuilders[cipher].Build();
}
