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VerifiedSigner

cratestack::context

Struct VerifiedSigner 

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

The key that signed a request body, as verified by CratestackEnvelope::open.

It is a recorded fact, not an identity. It is kept apart from auth/principal, which an AuthProvider fills. How a verified signer feeds the rate-limit and idempotency principal (§12), and whether it can stand in for an Authorization header, is decided by cratestack#1006. Recording a signer therefore does not make CratestackContext::is_authenticated true.

It names the key that verified, not the key the message claimed: open accepts a candidate only if its own kid equals the header’s, and then records that candidate’s full RFC 9679 thumbprint. Anything that derives a principal from a verified signer (#1006’s rate-limit and idempotency hooks) should key on thumbprint: an 8-byte kid prefix can collide (ADR 0006 §3; two keys sharing one are about 2³² keys away, and a test in cratestack-cose constructs a real pair), so the kid alone does not name one key.

The algorithm is the raw IANA “COSE Algorithms” value (-19 Ed25519, -9 ESP256, 4/5 HMAC), not a typed enum: core must not depend on cratestack-cose, and a raw registry value needs no core change when a new algorithm (Q5’s hybrid slot) arrives.

The fields are private, so a device or service id resolved from the key can still be added without a breaking change. The constructor took only a kid when cratestack#1004 merged; it now requires the thumbprint and the algorithm, so no envelope can record a signer without naming the key (a breaking change, acceptable pre-1.0 with no downstream user yet).

Implementations§

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impl VerifiedSigner

pub fn new( kid: impl Into<Bytes>, thumbprint: [u8; 32], alg: i64, ) -> VerifiedSigner

kid as it appeared in the protected header, thumbprint the full RFC 9679 thumbprint of the key that verified, alg its IANA COSE algorithm value.

Pass the kid as an owned copy, not as a Bytes slice of the received body: the signer lives as long as the context, and a slice would keep the whole body (payload included) alive with it.

pub fn kid(&self) -> &[u8] ⓘ

The verified key id, as it appeared in the protected header. The envelope checked that it is the verifying key’s own kid.

pub fn thumbprint(&self) -> &[u8; 32]

The RFC 9679 thumbprint of the key that verified: the unambiguous name of the signer.

pub fn alg(&self) -> i64

The IANA COSE algorithm value the message was verified with.

Trait Implementations§

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impl Clone for VerifiedSigner

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fn clone(&self) -> VerifiedSigner

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 Debug for VerifiedSigner

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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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impl Eq for VerifiedSigner

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impl PartialEq for VerifiedSigner

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fn eq(&self, other: &VerifiedSigner) -> bool

Tests for self and other values to be equal, and is used by ==.
1.0.0 (const: unstable) · Source§

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl StructuralPartialEq for VerifiedSigner

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