/// <summary>Calculate the counter and iv, update the decryptor.</summary>
/// <exception cref="System.IO.IOException"/>
private void UpdateDecryptor(Decryptor decryptor, long position, byte[] iv)
{
long counter = GetCounter(position);
codec.CalculateIV(initIV, counter, iv);
decryptor.Init(key, iv);
}
private void AssertIVCalculation(CryptoCodec codec, byte[] initIV, long counter,
byte[] Iv)
{
codec.CalculateIV(initIV, counter, Iv);
BigInteger iv = new BigInteger(1, Iv);
BigInteger @ref = CalculateRef(initIV, counter);
Assert.True("Calculated IV don't match with the reference", iv.
Equals(@ref));
}
/// <summary>
/// Update the
/// <see cref="encryptor"/>
/// : calculate counter and
/// <see cref="padding"/>
/// .
/// </summary>
/// <exception cref="System.IO.IOException"/>
private void UpdateEncryptor()
{
long counter = streamOffset / codec.GetCipherSuite().GetAlgorithmBlockSize();
padding = unchecked ((byte)(streamOffset % codec.GetCipherSuite().GetAlgorithmBlockSize
()));
inBuffer.Position(padding);
// Set proper position for input data.
codec.CalculateIV(initIV, counter, iv);
encryptor.Init(key, iv);
}