public bool Decode(byte[] authData)
{
try {
int index = 0;
// rpIdHash (32)
RpIdHash = authData.Skip(index).Take(32).ToArray();
index = index + 32;
// flags(1)
{
byte flags = authData[index];
index++;
Flags_UserPresentResult = Common.GetBit(flags, 0);
Flags_UserVerifiedResult = Common.GetBit(flags, 2);
Flags_AttestedCredentialDataIncluded = Common.GetBit(flags, 6);
Flags_ExtensionDataIncluded = Common.GetBit(flags, 7);
}
// signCount(4)
{
SignCount = Common.ToInt32(authData, index, true);
index = index + 4;
}
// aaguid 16
Aaguid = authData.Skip(index).Take(16).ToArray();
index = index + 16;
// credentialId
{
int credentialIdLength = Common.ToInt16(authData, index, true);
index = index + 2;
CredentialId = authData.Skip(index).Take(credentialIdLength).ToArray();
index = index + credentialIdLength;
}
// credentialPublicKey
{
var tmp = authData.Skip(index).ToArray();
// tmp -> cbors
// [0] credentialPublicKey
// [1] extensions
var cbors = CBORObject.DecodeSequenceFromBytes(tmp, CBOREncodeOptions.Default);
if (cbors.Count() > 0)
{
var credentialPublicKeyByte = cbors[0].EncodeToBytes();
// PublickKeyをPEMに変換する
PublicKeyPem = this.convertCOSEtoPEM(credentialPublicKeyByte);
}
}
return(true);
} catch (Exception ex) {
Logger.Err(ex, "Decode");
return(false);
}
}
private void parseAuthData(byte[] data)
{
try {
int index = 0;
// rpIdHash (32)
Attestation.RpIdHash = data.Skip(index).Take(32).ToArray();
index = index + 32;
// flags(1)
{
byte flags = data[index];
index++;
Attestation.Flags_UserPresentResult = Common.GetBit(flags, 0);
Attestation.Flags_UserVerifiedResult = Common.GetBit(flags, 2);
Attestation.Flags_AttestedCredentialDataIncluded = Common.GetBit(flags, 6);
Attestation.Flags_ExtensionDataIncluded = Common.GetBit(flags, 7);
}
// signCount(4)
{
Attestation.SignCount = Common.ToInt32(data, index, true);
index = index + 4;
}
// aaguid 16
Attestation.Aaguid = data.Skip(index).Take(16).ToArray();
index = index + 16;
// credentialId
{
int credentialIdLength = Common.ToInt16(data, index, true);
index = index + 2;
Attestation.CredentialId = data.Skip(index).Take(credentialIdLength).ToArray();
index = index + credentialIdLength;
}
// credentialPublicKey
if (Attestation.Flags_AttestedCredentialDataIncluded)
{
// credentialPublicKey(cbor) & extensions(cbor)
var tmp = data.Skip(index).ToArray();
// var tmp = Attestation.CredentialPublicKeyByte.ToArray();
//var tmp = Common.HexStringToBytes("A30181684649444F5F325F3003504B44444978AA4DB5A3221C6F9A4E5CDB04A362726BF5627570F5627576F5");
//var concatenated = Attestation.CredentialPublicKeyByte.Concat(tmp).ToArray();
// tmp -> cbors
// [0] credentialPublicKey
// [1] extensions
var cbors = CBORObject.DecodeSequenceFromBytes(tmp, CBOREncodeOptions.Default);
if (cbors.Count() > 0)
{
Attestation.CredentialPublicKey = cbors[0].ToJSONString();
Logger.Log("credentialPublicKeyCobr:" + Attestation.CredentialPublicKey);
Attestation.CredentialPublicKeyByte = cbors[0].EncodeToBytes();
}
}
} catch (Exception ex) {
Logger.Err(ex, "parseAuthData");
}
Attestation.AuthData = data.ToArray();
}