CrescendoDLL.PCSC.FIDODataStructures.AttestationStatement Class Reference

Represents a CTAP2 attestation statement containing cryptographic proof of credential origin. More...

Properties
int	Alg [get, set]
	COSE algorithm identifier for the attestation signature.
byte[]	Sig = default! [get, set]
	Cryptographic signature over the attestation data.
List< byte[]>	X5c = new List<byte[]>() [get, set]
	X.509 certificate chain (for X.509-based attestation formats)

Detailed Description

Represents a CTAP2 attestation statement containing cryptographic proof of credential origin.

Property Documentation

Alg

int CrescendoDLL.PCSC.FIDODataStructures.AttestationStatement.Alg

getset

COSE algorithm identifier for the attestation signature.

Required parameter. Registered algorithm identifier from IANA COSE Algorithms registry (e.g., -7 for ES256, -257 for RS256). Matches the algorithm used in the authenticator's attestation key.

Sig

byte [] CrescendoDLL.PCSC.FIDODataStructures.AttestationStatement.Sig = default!

getset

Cryptographic signature over the attestation data.

Required parameter. Signature generated using the attestation private key over:

• Authenticator data (authData)
• SHA-256 hash of client data JSON

Verification method depends on the attestation format.

X5c

List<byte[]> CrescendoDLL.PCSC.FIDODataStructures.AttestationStatement.X5c = new List<byte[]>()

getset

X.509 certificate chain (for X.509-based attestation formats)

Optional parameter. Ordered list where:

• First certificate is the attestation certificate
• Subsequent certificates chain to a trusted root

May be empty for non-X.509 attestation formats (e.g., packed).