private void InitCiphers()
{
CfbBlockCipher encryptor = new CfbBlockCipher(new AesEngine(), 8);
CfbBlockCipher decryptor = new CfbBlockCipher(new AesEngine(), 8);
encryptor.Init(true, new ParametersWithIV(new KeyParameter(SharedKey), SharedKey));
decryptor.Init(false, new ParametersWithIV(new KeyParameter(SharedKey), SharedKey));
encStream = new StreamBlockCipher(encryptor);
decStream = new StreamBlockCipher(decryptor);
}
public virtual ITestResult Perform()
{
KeyParameter key = new KeyParameter(Hex.Decode("0011223344556677"));
byte[] input = Hex.Decode("4e6f7720");
byte[] out1 = new byte[4];
byte[] out2 = new byte[4];
IBlockCipher ofb = new OfbBlockCipher(new DesEngine(), 32);
ofb.Init(true, new ParametersWithIV(key, Hex.Decode("1122334455667788")));
ofb.ProcessBlock(input, 0, out1, 0);
ofb.Init(false, new ParametersWithIV(key, Hex.Decode("1122334455667788")));
ofb.ProcessBlock(out1, 0, out2, 0);
if (!Arrays.AreEqual(out2, input))
{
return(new SimpleTestResult(false, Name + ": test 1 - in != out"));
}
ofb.Init(true, new ParametersWithIV(key, Hex.Decode("11223344")));
ofb.ProcessBlock(input, 0, out1, 0);
ofb.Init(false, new ParametersWithIV(key, Hex.Decode("0000000011223344")));
ofb.ProcessBlock(out1, 0, out2, 0);
if (!Arrays.AreEqual(out2, input))
{
return(new SimpleTestResult(false, Name + ": test 2 - in != out"));
}
IBlockCipher cfb = new CfbBlockCipher(new DesEngine(), 32);
cfb.Init(true, new ParametersWithIV(key, Hex.Decode("1122334455667788")));
cfb.ProcessBlock(input, 0, out1, 0);
cfb.Init(false, new ParametersWithIV(key, Hex.Decode("1122334455667788")));
cfb.ProcessBlock(out1, 0, out2, 0);
if (!Arrays.AreEqual(out2, input))
{
return(new SimpleTestResult(false, Name + ": test 3 - in != out"));
}
cfb.Init(true, new ParametersWithIV(key, Hex.Decode("11223344")));
cfb.ProcessBlock(input, 0, out1, 0);
cfb.Init(false, new ParametersWithIV(key, Hex.Decode("0000000011223344")));
cfb.ProcessBlock(out1, 0, out2, 0);
if (!Arrays.AreEqual(out2, input))
{
return(new SimpleTestResult(false, Name + ": test 4 - in != out"));
}
return(new SimpleTestResult(true, Name + ": Okay"));
}
} // DecryptArray
/*
* private static bool DONT_USE_AESEncDecArray(bool bEncryptorDecrypt, ref byte[] aData, byte[] aAESKey, byte[] aIV = null)
* {
* bool bRet = true;
* try
* {
* if ( (aData == null)
|| ((bEncryptorDecrypt == true) && (aData.Length == 0))
|| ((bEncryptorDecrypt == false) && (aData.Length <= 16)) //Must be longer than the IV, when decrypting
|| (aAESKey.Length != 32)
|| ((aIV != null) && (aIV.Length != 16)))
|| return false;
||
|| // Instantiate a new Aes object to perform string symmetric encryption
||
|| using (Rijndael AES = RijndaelManaged.Create()) //Not FIPS compliant. :(
|| //using (Aes AES = Aes.Create()) //Issues! Not compatible with AES CPP implementation
|| {
|| //Construct the IV
|| bool bIVWasNull = (aIV == null);
|| if (bIVWasNull)
|| aIV = new byte[16];
||
|| if (bEncryptorDecrypt)
|| {
|| if (bIVWasNull)
|| aIV.FillRandom(); //when encrypting: new IV
|| }
|| else
|| Array.Copy(aData, aData.Length - 16, aIV, 0, 16); //when decrypting: use the IV thats the last 16 bytes of the data.
||
|| // Set mode, padding, key and IV
|| AES.Mode = CipherMode.CFB;
|| AES.Padding = PaddingMode.None;
|| AES.Key = aAESKey;
|| AES.IV = aIV;
|| AES.BlockSize = 128; //16 bytes
||
|| // Instantiate a new MemoryStream object to contain the encrypted bytes
|| MemoryStream ms = new MemoryStream();
|| //Dispose not required on MemoryStream, but gives a compiler warning/error when in a 'using' as CryptoStream below disposes of it as well.
|| //using (MemoryStream ms = new MemoryStream())
|| {
|| // Instantiate a new encryptor/decryptor from our Aes object
|| using (ICryptoTransform aesCryptor = bEncryptorDecrypt ? AES.CreateEncryptor() : AES.CreateDecryptor())
|| {
|| // Instantiate a new CryptoStream object to process the data and write it to the memory stream
|| using (CryptoStream cs = new CryptoStream(ms, aesCryptor, CryptoStreamMode.Write))
|| {
|| // Encrypt/decrypt the input
|| int iCount = bEncryptorDecrypt ? aData.Length : aData.Length - 16;
|| cs.Write(aData, 0, iCount); //-16, ignore the IV
||
|| //Add padding
|| int iPadded = -1;
|| {
|| //Padding.. .Why do we have to do this!
|| int iBlockSizeInBytes = AES.BlockSize / 8; //Bits to bytes.
||
|| int iCompleteBlock = iBlockSizeInBytes - (iCount % iBlockSizeInBytes);
|| if (iCompleteBlock < iBlockSizeInBytes)
|| {
|| iPadded = iCompleteBlock;
|| byte[] aZero = new byte[iPadded];
|| cs.Write(aZero, 0, iPadded); //-16, ignore the IV
|| }
||
|| }
||
|| // Complete the encrypt/decrypt process
|| cs.FlushFinalBlock();
||
|| //Remove Padding
|| if (iPadded > 0)
|| {
||
|| long iLen = ms.Length;
|| if (iLen > iPadded)
|| ms.SetLength(iLen - iPadded);
|| }
||
|| if (bEncryptorDecrypt)
|| ms.Write(aIV, 0, aIV.Length);
||
|| // Convert the encrypted/decrypted data from a MemoryStream to a byte array
|| aData = ms.ToArray();
|| }
|| }
|| }
|| }
|| }
|| catch (Exception e) { bRet = false; e.CatchMessage().TraceError("EncDecArray(): "); }
|| return bRet;
||} // DONT_USE_AESEncDecArray
*/
private static bool AESEncDecArray(bool bEncryptorDecrypt, ref byte[] aData, byte[] aAESKey, byte[] aIV = null)
{
bool bRet = true;
try
{
if ((aData == null) ||
((bEncryptorDecrypt == true) && (aData.Length == 0)) ||
((bEncryptorDecrypt == false) && (aData.Length <= 16)) || //Must be longer than the IV, when decrypting
(aAESKey.Length != 32) ||
((aIV != null) && (aIV.Length != 16)))
{
return(false);
}
//Construct the IV
bool bIVWasNull = (aIV == null);
if (bIVWasNull)
{
aIV = new byte[16];
}
int iDataLength = 0;
if (bEncryptorDecrypt)
{
iDataLength = aData.Length;
if (bIVWasNull)
{
aIV.FillRandom(); //when encrypting: new IV
}
}
else
{
Array.Copy(aData, aData.Length - 16, aIV, 0, 16); //when decrypting: use the IV thats the last 16 bytes of the data.
iDataLength = aData.Length - 16;
}
CfbBlockCipher cfb = new CfbBlockCipher(new AesEngine(), 128);
cfb.Init(bEncryptorDecrypt, new ParametersWithIV(new KeyParameter(aAESKey), aIV));
int iBlockSize = cfb.GetBlockSize();
for (int i = 0; i < iDataLength; i += iBlockSize)
{
int iRet = 0;
int iRemaining = iDataLength - i;
if (iRemaining < iBlockSize)
{
//Last partial block
byte[] aIn = new byte[iBlockSize];
byte[] aOut = new byte[iBlockSize];
Array.Copy(aData, i, aIn, 0, iRemaining);
if (bEncryptorDecrypt)
{
iRet = cfb.EncryptBlock(aIn, 0, aOut, 0);
}
else
{
iRet = cfb.DecryptBlock(aIn, 0, aOut, 0);
}
Array.Copy(aOut, 0, aData, i, iRemaining);
continue;
}
if (bEncryptorDecrypt)
{
iRet = cfb.EncryptBlock(aData, i, aData, i);
}
else
{
iRet = cfb.DecryptBlock(aData, i, aData, i);
}
}
if (bEncryptorDecrypt)
{
//Append IV.
Array.Resize(ref aData, iDataLength + 16);
Array.Copy(aIV, 0, aData, iDataLength, 16);
}
else
{
//Remove IV
Array.Resize(ref aData, iDataLength);
}
}
catch (Exception e) { bRet = false; e.CatchMessage().TraceError("AESEncDecArray(): "); }
return(bRet);
} // AESEncDecArray
