/// <summary>
/// Decodes attested credential data.
/// </summary>
public AttestedCredentialData(BinaryReader reader)
{
// First 16 bytes is AAGUID
byte[] aaguidBytes = reader.ReadBytes(Marshal.SizeOf(typeof(Guid)));
// GUID from authenticator is big endian. If we are on a little endian system, convert.
this.AaGuid = aaguidBytes.ToGuidBigEndian();
// Byte length of Credential ID, 16-bit unsigned big-endian integer.
byte[] credentialIDLenBytes = reader.ReadBytes(sizeof(UInt16));
// Credential ID length from authenticator is big endian. If we are on little endian system, convert.
ushort credentialIDLen = credentialIDLenBytes.ToUInt16BigEndian();
// Read the credential ID bytes
this.CredentialID = reader.ReadBytes(credentialIDLen);
// "Determining attested credential data's length, which is variable, involves determining
// credentialPublicKey's beginning location given the preceding credentialId's length, and
// then determining the credentialPublicKey's length"
// "CBORObject.Read: This method will read from the stream until the end
// of the CBOR object is reached or an error occurs, whichever happens first."
// Read the CBOR object from the stream
var cpk = PeterO.Cbor.CBORObject.Read(reader.BaseStream);
// Encode the CBOR object back to a byte array.
this.CredentialPublicKey = new CredentialPublicKey(cpk);
}
/// <summary>
/// Decodes attested credential data.
/// </summary>
public AttestedCredentialData(BinaryReader reader)
{
// First 16 bytes is AAGUID
var aaguidBytes = reader.ReadBytes(Marshal.SizeOf(typeof(Guid)));
if (BitConverter.IsLittleEndian)
{
// GUID from authenticator is big endian. If we are on a little endian system, convert.
AaGuid = FromBigEndian(aaguidBytes);
}
else
{
AaGuid = new Guid(aaguidBytes);
}
// Byte length of Credential ID, 16-bit unsigned big-endian integer.
var credentialIDLenBytes = reader.ReadBytes(sizeof(UInt16));
if (BitConverter.IsLittleEndian)
{
// Credential ID length from authenticator is big endian. If we are on little endian system, convert.
Array.Reverse(credentialIDLenBytes);
}
// Convert the read bytes to uint16 so we know how many bytes to read for the credential ID
var credentialIDLen = BitConverter.ToUInt16(credentialIDLenBytes, 0);
// Read the credential ID bytes
CredentialID = reader.ReadBytes(credentialIDLen);
// "Determining attested credential data's length, which is variable, involves determining
// credentialPublicKey's beginning location given the preceding credentialId's length, and
// then determining the credentialPublicKey's length"
// "CBORObject.Read: This method will read from the stream until the end
// of the CBOR object is reached or an error occurs, whichever happens first."
// Read the CBOR object from the stream
var cpk = PeterO.Cbor.CBORObject.Read(reader.BaseStream);
// Encode the CBOR object back to a byte array.
CredentialPublicKey = new CredentialPublicKey(cpk);
}
