public void Decrypt(BinaryReader input, string keyPhrase, BinaryWriter output)
{
var block = new byte[2 * U];
var key = GenerateKey(keyPhrase);
var s = CreateSArray(key);
for (int i = 0; i < B; i++)
{
key[i] = 0;
}
input.Read(block);
var vector = Rc5Common.Decrypt(block, s);
while (input.Read(block) > 0)
{
var partlyDecrypted = Rc5Common.Decrypt(block, s);
var decrypted = partlyDecrypted.Zip(vector, (fst, snd) => (byte)(fst ^ snd)).ToArray();
output.Write(input.BaseStream.Length != input.BaseStream.Position ?
decrypted :
decrypted.Take(2 * U - decrypted.Last()).ToArray());
Array.Copy(block, vector, 2 * U);
}
for (int i = 0; i < SArraySize; i++)
{
s[i] = 0;
}
}
public void Encrypt(BinaryReader input, string keyPhrase, BinaryWriter output)
{
var enumerable = new Rc5BinaryEnumerable(input);
var vector = GenerateVector();
var key = GenerateKey(keyPhrase);
var s = CreateSArray(key);
for (int i = 0; i < B; i++)
{
key[i] = 0;
}
var vectorEncrypted = Rc5Common.Encrypt(vector, s);
output.Write(vectorEncrypted);
foreach (var block in enumerable)
{
var forEncryption = block.Zip(vector, (fst, snd) => (byte)(fst ^ snd)).ToArray();
var encrypted = Rc5Common.Encrypt(forEncryption, s);
output.Write(encrypted);
vector = encrypted;
}
for (int i = 0; i < SArraySize; i++)
{
s[i] = 0;
}
}
