public byte[] ToByteArray()
{
using (var ms = new MemoryStream())
{
using (var writer = new BinaryWriter(ms))
{
// Write the aaguid bytes out, reverse if we're on a little endian system
if (BitConverter.IsLittleEndian)
{
writer.Write(AaGuidToBigEndian(AaGuid));
}
else
{
writer.Write(AaGuid.ToByteArray());
}
// Write the length of credential ID, as big endian bytes of a 16-bit unsigned integer
var credentialIDLen = (ushort)CredentialID.Length;
var credentialIDLenBytes = BitConverter.GetBytes(credentialIDLen);
if (BitConverter.IsLittleEndian)
{
Array.Reverse(credentialIDLenBytes);
}
writer.Write(credentialIDLenBytes);
// Write CredentialID bytes
writer.Write(CredentialID);
// Write credential public key bytes
writer.Write(CredentialPublicKey.GetBytes());
}
return(ms.ToArray());
}
}
/// <summary>
/// AAGUID is sent as big endian byte array, this converter is for little endian systems.
/// </summary>
private byte[] AaGuidToBigEndian()
{
var aaguid = AaGuid.ToByteArray();
SwapBytes(aaguid, 0, 3);
SwapBytes(aaguid, 1, 2);
SwapBytes(aaguid, 4, 5);
SwapBytes(aaguid, 6, 7);
return(aaguid);
}