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P256Signer

cratestack::cose

Struct P256Signer 

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pub struct P256Signer { /* private fields */ }
Expand description

An ESP256 (-9) signer from a 32-byte private scalar.

Signatures are deterministic (RFC 6979), so this signer’s output is reproducible. What it returns may have a high s: the envelope normalises every ESP256 signature to low-s after the signer returns, whichever signer it was (this one, a KMS, WebCrypto), because the verifier accepts low-s only. ECDSA verifiers do not care how k was chosen, so a randomized signature from a KMS verifies the same way once normalised.

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impl P256Signer

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pub fn from_scalar(scalar: &[u8; 32]) -> Result<P256Signer, CratestackError>

Fails with CratestackError::Validation for a scalar that is zero or not below the group order.

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pub fn verify_key(&self) -> CoseVerifyKey

The matching verification key, for a resolver.

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impl Clone for P256Signer

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fn clone(&self) -> P256Signer

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl CoseSigner for P256Signer

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fn sign_chunks( &self, to_be_signed: &[&[u8]], ) -> Option<Result<Vec<u8>, CratestackError>>

ESP256 signs SHA-256 of the message, so the structure is hashed in pieces. The result is the one sign gives for the concatenation (RFC 6979 derives k from the same digest).

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fn alg(&self) -> CoseAlg

The algorithm every signature from this signer uses.
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fn kid(&self) -> &[u8] ⓘ

The key’s kid: the first 8 bytes of its RFC 9679 thumbprint (§3).
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fn sign<'life0, 'life1, 'async_trait>( &'life0 self, to_be_signed: &'life1 [u8], ) -> Pin<Box<dyn Future<Output = Result<Vec<u8>, CratestackError>> + Send + 'async_trait>>
where 'life0: 'async_trait, 'life1: 'async_trait, P256Signer: 'async_trait,

Sign (or MAC) to_be_signed. For HMAC 256/64 this returns the truncated 8-byte tag. An error is a backend failure (a 500).
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impl Debug for P256Signer

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more

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