/// <summary>
/// The MAC key is the first 32 bytes of the first key stream block.
/// </summary>
/// <param name="nonce">The nonce.</param>
/// <returns>System.Byte[].</returns>
private Span <byte> GetMacKey(ReadOnlySpan <byte> nonce)
{
Span <byte> firstBlock = new byte[_macKeySnuffle.BlockSizeInBytes];
_macKeySnuffle.ProcessKeyStreamBlock(nonce, 0, firstBlock);
return(firstBlock[..Poly1305.MAC_KEY_SIZE_IN_BYTES]);
/// <summary>
/// The MAC key is the first 32 bytes of the first key stream block.
/// </summary>
/// <param name="nonce">The nonce.</param>
/// <returns>System.Byte[].</returns>
private Span <byte> GetMacKey(ReadOnlySpan <byte> nonce)
{
Span <byte> firstBlock = new byte[Snuffle.BLOCK_SIZE_IN_BYTES];
_macKeySnuffle.ProcessKeyStreamBlock(nonce, 0, firstBlock);
return(firstBlock.Slice(0, Poly1305.MAC_KEY_SIZE_IN_BYTES));
}
/// <summary>
/// The MAC key is the first 32 bytes of the first key stream block.
/// </summary>
/// <param name="nonce">The nonce.</param>
/// <returns>System.Byte[].</returns>
private SpanOwner <byte> GetMacKey(ReadOnlySpan <byte> nonce)
{
//var firstBlock = new byte[Snuffle.BLOCK_SIZE_IN_BYTES];
//_macKeySnuffle.ProcessKeyStreamBlock(nonce, 0, firstBlock);
//var result = new byte[Poly1305.MAC_KEY_SIZE_IN_BYTES];
//Array.Copy(firstBlock, result, result.Length);
//return result;
using (var firstBlock = SpanOwner <byte> .Allocate(Snuffle.BLOCK_SIZE_IN_BYTES, AllocationMode.Clear))
{
//Span<byte> firstBlock = new byte[Snuffle.BLOCK_SIZE_IN_BYTES];
_macKeySnuffle.ProcessKeyStreamBlock(nonce, 0, firstBlock.Span);
var macKey = SpanOwner <byte> .Allocate(Poly1305.MAC_KEY_SIZE_IN_BYTES, AllocationMode.Clear);
firstBlock.Span.Slice(0, Poly1305.MAC_KEY_SIZE_IN_BYTES).CopyTo(macKey.Span);
firstBlock.Span.Clear();
return(macKey);
}
}
