cose library

COSE wrappers for xDSA and xHPKE.

https://datatracker.ietf.org/doc/html/rfc8152 https://datatracker.ietf.org/doc/html/draft-ietf-cose-hpke

Functions

decrypt({required Uint8List msgToOpen, required Object? msgToAuth, required SecretKey recipient, required Uint8List domain}) → Uint8List

Decrypts a sealed message without verifying the signature.

encrypt({required Uint8List sign1, required Object? msgToAuth, required PublicKey recipient, required Uint8List domain}) → Uint8List

Encrypts an already-signed COSE_Sign1 to a recipient.

open<T>({required Uint8List msgToOpen, required Object? msgToAuth, required SecretKey recipient, required PublicKey sender, required Uint8List domain, int? maxDriftSecs}) → T

Decrypts and verifies a sealed message.

peek<T>({required Uint8List signature}) → T

Extracts the embedded payload from a COSE_Sign1 signature without verifying it.

recipient({required Uint8List ciphertext}) → Fingerprint

Extracts the recipient's fingerprint from a COSE_Encrypt0 message without decrypting it.

seal({required Object? msgToSeal, required Object? msgToAuth, required SecretKey signer, required PublicKey recipient, required Uint8List domain}) → Uint8List

Signs a message then encrypts it to a recipient.

sign({required Object? msgToEmbed, required Object? msgToAuth, required SecretKey signer, required Uint8List domain}) → Uint8List

Creates a COSE_Sign1 digital signature with an embedded payload.

signDetached({required Object? msgToAuth, required SecretKey signer, required Uint8List domain}) → Uint8List

Creates a COSE_Sign1 digital signature without an embedded payload (i.e. payload is empty).

signer({required Uint8List signature}) → Fingerprint

Extracts the signer's fingerprint from a COSE_Sign1 signature without verifying it.

verify<T>({required Uint8List msgToCheck, required Object? msgToAuth, required PublicKey verifier, required Uint8List domain, int? maxDriftSecs}) → T

Validates a COSE_Sign1 digital signature and returns the embedded payload.

verifyDetached({required Uint8List msgToCheck, required Object? msgToAuth, required PublicKey verifier, required Uint8List domain, int? maxDriftSecs}) → void

Validates a COSE_Sign1 digital signature with a detached payload.