public void Encrypt(ReadOnlySpan <byte> input, Span <byte> output)
{
int length = Math.Min(input.Length, output.Length);
int blockCount = length >> 4;
int leftover = length & 0xF;
// Data units must be at least 1 block long.
if (length < Aes.BlockSize)
{
throw new ArgumentException();
}
var tweak = new Buffer16();
_tweakAesCore.Encrypt(Iv, tweak);
using var tweakBuffer = new RentedArray <byte>(blockCount * Aes.BlockSize);
tweak = FillTweakBuffer(tweak, MemoryMarshal.Cast <byte, Buffer16>(tweakBuffer.Span));
Utilities.XorArrays(output, input, tweakBuffer.Span);
_dataAesCore.Encrypt(output.Slice(0, blockCount * Aes.BlockSize), output);
Utilities.XorArrays(output, output, tweakBuffer.Array);
if (leftover != 0)
{
Buffer16 inBlock =
Unsafe.Add(ref Unsafe.As <byte, Buffer16>(ref MemoryMarshal.GetReference(input)), blockCount);
ref Buffer16 outBlock =
ref Unsafe.Add(ref Unsafe.As <byte, Buffer16>(ref MemoryMarshal.GetReference(output)), blockCount);
ref Buffer16 prevOutBlock = ref Unsafe.Subtract(ref outBlock, 1);
public void Transform(ReadOnlySpan<byte> input, Span<byte> output)
{
int blockCount = BitUtil.DivideUp(input.Length, Aes.BlockSize);
int length = blockCount * Aes.BlockSize;
using var counterBuffer = new RentedArray<byte>(length);
FillDecryptedCounter(Iv, counterBuffer.Span);
_aesCore.Encrypt(counterBuffer.Array, counterBuffer.Array, length);
Utilities.XorArrays(output, input, counterBuffer.Span);
}
public void Encrypt(ReadOnlySpan <byte> input, Span <byte> output)
{
_aesCore.Encrypt(input, output);
}