public async Task <byte[]> HandleEncryption(CipherAction cipherAction, SymmetricCipherMode cipherMode, CipherBlockSize cipherBlockSize,
Stream data, Stream keyStream, Stream initilizationVectorStream)
{
var dataToProcess = await ReadAllBytesFromStream(data);
var key = await ReadAllBytesFromStream(keyStream);
_symmetricCipherManager.Key = key;
_symmetricCipherManager.CipherMode = cipherMode;
_symmetricCipherManager.CipherBlockSize = cipherBlockSize;
if (cipherMode is not SymmetricCipherMode.ElectronicCodeBook)
{
var initializationVector = await ReadAllBytesFromStream(initilizationVectorStream);
_symmetricCipherManager.InitializationVector = initializationVector;
}
var processedData = new byte[] {};
switch (cipherAction)
{
case CipherAction.Encrypt:
processedData = _symmetricCipherManager.Encrypt(dataToProcess);
break;
case CipherAction.Decrypt:
processedData = _symmetricCipherManager.Decrypt(dataToProcess);
break;
}
return(processedData);
}
public void GenerateAndSaveRandomKeyToFile(string fileName, CipherBlockSize cipherBlockSize)
{
var randomKey = GenerateRandomKey((int)cipherBlockSize / 8);
WriteAllBytesToFile(fileName, randomKey);
}
public void ShouldResultAfterEncryptionThenDecryptionBeSameAsOriginaldata(int blockSize, CipherBlockSize cipherBlockSize)
{
//arrange
var openText = new byte[blockSize];
var key = new byte[blockSize];
var random = new Random();
random.NextBytes(openText);
random.NextBytes(key);
var rijandelUnderTest = new RijandelCipher();
rijandelUnderTest.CipherBlockSize = cipherBlockSize;
rijandelUnderTest.CreateRoundKeys(key);
//act
var cipherText = rijandelUnderTest.Encrypt(openText);
var actualdecryptionResult = rijandelUnderTest.Decrypt(cipherText);
//assert
Assert.Equal(openText, actualdecryptionResult);
}
