public void Decrypt(string inputFilePath, string outputFilePath)
{
using (var block = new RC5Block(inputFilePath, outputFilePath, BB))
{
var initializationVector = block.ReadBlock();
var prevEncryptedBlock = new byte[BB];
Array.Copy(initializationVector, prevEncryptedBlock, (int)BB);
byte[] encryptedBlock;
var decryptedBlock = new byte[BB];
while ((encryptedBlock = block.ReadBlock()) != null)
{
Decrypt(encryptedBlock, decryptedBlock);
for (var i = 0; i < decryptedBlock.Length; i++)
{
decryptedBlock[i] = (byte)(prevEncryptedBlock[i] ^ decryptedBlock[i]);
}
block.PutBlock(decryptedBlock);
Array.Copy(encryptedBlock, prevEncryptedBlock, (int)BB);
}
}
}
public void Encrypt(string inputFilePath, string outputFilePath)
{
using (var block = new RC5Block(inputFilePath, outputFilePath, BB))
{
// generate initialization vector
var encryptedBlock = new byte[BB];
//
//
//
Random.NextBytes(ref encryptedBlock);
//
//
//
block.PutBlock(encryptedBlock);
byte[] inputBlock;
while ((inputBlock = block.ReadBlock()) != null)
{
for (var i = 0; i < inputBlock.Length; i++)
{
inputBlock[i] = (byte)(inputBlock[i] ^ encryptedBlock[i]);
}
Encrypt(inputBlock, encryptedBlock);
block.PutBlock(encryptedBlock);
}
}
}
