CoseEcPublicKey Constructor

CoseEcPublicKey(CoseEcCurve, ReadOnlyMemory<byte>, ReadOnlyMemory<byte>)

Construct a CoseEcPublicKey based on the curve and point.

C#

public CoseEcPublicKey(CoseEcCurve curve, ReadOnlyMemory<byte> xCoordinate, ReadOnlyMemory<byte> yCoordinate)

Parameters

Type	Name	Description
CoseEcCurve	curve	The curve for this public key.
ReadOnlyMemory<byte>	xCoordinate	The x-coordinate of the public point.
ReadOnlyMemory<byte>	yCoordinate	The y-coordinate of the public point.

Exceptions

Type	Condition
ArgumentException	The xCoordinate or yCoordinate is not the correct length, or when the curve is not supported.

Remarks

An ECC public key is a curve and public point (x and y coordinates). This constructor expects the length of each coordinate to be at least one byte and 32 bytes or fewer. Valid keys are P-256, P-384, and P-521. Note: Certain keys might not be supported by the YubiKey.

CoseEcPublicKey(CoseEcCurve, CoseAlgorithmIdentifier, ReadOnlyMemory<byte>, ReadOnlyMemory<byte>)

Construct a CoseEcPublicKey based on the curve and x and y coordinates.

C#

public CoseEcPublicKey(CoseEcCurve curve, CoseAlgorithmIdentifier algorithm, ReadOnlyMemory<byte> xCoordinate, ReadOnlyMemory<byte> yCoordinate)

Parameters

Type	Name	Description
CoseEcCurve	curve	The curve for this public key.
CoseAlgorithmIdentifier	algorithm	The algorithm of the key.
ReadOnlyMemory<byte>	xCoordinate	The x-coordinate of the public point.
ReadOnlyMemory<byte>	yCoordinate	The y-coordinate of the public point.

Exceptions

Type	Condition
ArgumentException	The xCoordinate or yCoordinate is not the correct length, or when the curve is not supported.

Remarks

An ECC public key is a curve and public point (x and y coordinates). Valid keys are P-256, P-384, and P-521. Note: Certain keys might not be supported by the YubiKey.

CoseEcPublicKey(ReadOnlyMemory<byte>)

Construct a CoseEcPublicKey based on the CBOR encoding of a COSE_Key.

C#

public CoseEcPublicKey(ReadOnlyMemory<byte> encodedCoseKey)

Parameters

Type	Name	Description
ReadOnlyMemory<byte>	encodedCoseKey	The CBOR encoding.

Exceptions

Type	Condition
Ctap2DataException	The encodedCoseKey is not a correct EC Public Key encoding.

CoseEcPublicKey(ECParameters)

Construct a CoseEcPublicKey based on .NET elliptic curve parameters.

C#

public CoseEcPublicKey(ECParameters ecParameters)

Parameters

Type	Name	Description
ECParameters	ecParameters	An ECParameters structure with a specified Curve and a public point Q.

Exceptions

Type	Condition
ArgumentException	The ECParameters object does not contain a valid curve and
NotSupportedException	The parameters/public key specified is not supported.