SoftwareEs256Signer class

An in-memory Es256Signer for tests and examples — a real P-256 key that produces real, verifiable ES256 signatures, with no hardware involved.

Signatures are deterministic (RFC 6979) and normalised to low-S, so the same input always yields the same output and third-party verifiers that reject high-S signatures still accept them.

Implemented types

• Es256Signer

Constructors

SoftwareEs256Signer.generate({Random? random, KeyAttestation? attestor(String nonce)?})

Generates a fresh key. Pass a seeded random for reproducible keys, and attestor to exercise the optional attest path.

factory

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

attest(String nonce) → Future<KeyAttestation?>

Optional key attestation bound to nonce. Returns null when the implementation cannot attest, in which case the library simply omits it.

override

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

publicJwk() → Future<Map<String, dynamic>>

Public JWK of the holder key (kty:EC, crv:P-256, x, y). Goes into the credential's cnf claim and into proof / KB-JWT headers.

override

publicJwkSync() → Map<String, dynamic>

Synchronous accessor for the public JWK — handy when acting as a test issuer (e.g. serving a jwt-vc-issuer JWK set).

signBytes(List<int> message) → Uint8List

Signs raw message bytes with ES256 (low-S), returning the 64-byte R‖S. Useful when acting as a test issuer signing non-JOSE bytes — e.g. an X.509 TBSCertificate when building a chain fixture. signEs256 is the JOSE-string variant most callers want.

signEs256(String signingInput) → Future<String>

Signs a JOSE signing input (base64url(header).base64url(payload)) and returns the signature as raw R‖S (64 bytes), base64url — the ES256 wire format. A hardware implementation triggers the biometric/PIN gate here when the key is auth-required.

override

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited