private byte[] EncryptDataFile(byte[] fileBytes)
{
byte[] encryptedBytes;
switch (Settings.Default.DataFileCryption)
{
case CryptoChoices.OneTimePad:
OneTimePadCrypter otp = new OneTimePadCrypter(Encoding.UTF8.GetBytes(Settings.Default.CryptionDataKey));
encryptedBytes = otp.Encrypt(fileBytes);
break;
case CryptoChoices.TEA:
TEACrypter tea = new TEACrypter(Encoding.UTF8.GetBytes(Settings.Default.CryptionDataKey));
if (TEACrypter.CheckIfDataNeedsPadding(fileBytes))
{
fileBytes = TEACrypter.PadData(fileBytes);
Settings.Default.DataFilePadded = true;
Settings.Default.Save();
}
encryptedBytes = tea.Encrypt(fileBytes);
break;
default:
throw new InvalidOperationException("Cryption settings are not valid: Desired cryption algorithm doesn't exist.");
}
return(encryptedBytes);
}
public void ShouldEncryptAndDecryptFullBlockByTEA()
{
var rnd = new Random(19);
var block = new byte[8];
var key = new byte[16];
rnd.NextBytes(block);
rnd.NextBytes(key);
var crypter = new TEACrypter(key);
var encrypt = crypter.Encrypt(block);
var decrypt = crypter.Decrypt(encrypt);
decrypt.Should().BeEquivalentTo(block, o => o.WithStrictOrdering());
}
public byte[] EncryptFile(string fileName, byte[] fileBytes, CryptoChoice settings, bool replaceRecordIfConflict = false)
{
if (ReadRecord(fileName) != null)
{
if (replaceRecordIfConflict)
{
RemoveRecord(fileName);
}
else
{
throw new InvalidOperationException("The record for a file with this name already exists. If you want to replace it, pass another bool as an argument to the method.");
}
}
SHA1Hasher sha1 = new SHA1Hasher();
sha1.ComputeHash(fileBytes);
string fileHash = sha1.HashedString;
byte[] encryptedBytes;
switch (settings.Choice)
{
case CryptoChoices.OneTimePad:
OneTimePadCrypter otp = new OneTimePadCrypter(settings.Key);
encryptedBytes = otp.Encrypt(fileBytes);
break;
case CryptoChoices.TEA:
TEACrypter tea = new TEACrypter(settings.Key);
if (TEACrypter.CheckIfDataNeedsPadding(fileBytes))
{
fileBytes = TEACrypter.PadData(fileBytes);
settings.Depad = true;
}
encryptedBytes = tea.Encrypt(fileBytes);
break;
default:
throw new InvalidOperationException("Cryption settings are not valid: Desired cryption algorithm doesn't exist.");
}
AddRecord(fileName, settings, fileHash);
return(encryptedBytes);
}
