public OOTransport(bool initiator, CipherState <CipherType> c1, CipherState <CipherType> c2)
{
Exceptions.ThrowIfNull(c1, nameof(c1));
this.initiator = initiator;
this.c1 = c1;
this.c2 = c2;
filter = new ReplayFilterNoBitshift();
}
/// <summary>
/// Returns a pair of CipherState objects for encrypting transport messages.
/// </summary>
public (CipherState <CipherType> c1, CipherState <CipherType> c2) Split()
{
Span <byte> output = stackalloc byte[2 * hash.HashLen];
hkdf.ExtractAndExpand2(ck, null, output);
var tempK1 = output.Slice(0, Aead.KeySize);
var tempK2 = output.Slice(hash.HashLen, Aead.KeySize);
var c1 = new CipherState <CipherType>();
var c2 = new CipherState <CipherType>();
c1.InitializeKey(tempK1);
c2.InitializeKey(tempK2);
return(c1, c2);
}