Struct Store 

pub struct Store { /* private fields */ }

Local encrypted keystore.

Private keys are encrypted with AES-256-GCM before writing to disk. The encryption key is derived from a machine-specific secret so key files are useless if copied to another machine.

v2 will delegate to OS credential stores (Secure Enclave / TPM 2.0).

Implementations

impl Store

pub fn open(dir: impl AsRef<Path>) -> Result<Self, KeyError>

Opens or creates a keystore at dir.

pub fn generate(&self, set_default: bool) -> Result<KeyInfo, KeyError>

Generates a new Ed25519 keypair, encrypts and stores it. If set_default is true (or there is no current default), makes this key the default signing key.

pub fn rotate( &self, predecessor_id: Option<&str>, grace_period: Duration, set_default: bool, ) -> Result<RotationResult, KeyError>

Rotate the current default key (or a specific key) to a freshly generated successor.

Mints a new Ed25519 keypair, links the predecessor to it via successor_key_id, and stamps the predecessor with a valid_until of now + grace_period. The grace window lets verifiers continue to accept signatures from the predecessor while clients catch up to the new public key.

If set_default is true (the typical case – you rotate because you want to start signing with the new key immediately), the successor becomes the default. Pass false to stage a rotation for review without flipping the active signer.

predecessor_id may be None to rotate the current default. Pass an explicit id to rotate a non-default key (e.g. a per-environment secondary).

Note on threat model: this is a graceful rotation primitive, not a revocation primitive. If the predecessor key is suspected compromised the grace_period should be Duration::ZERO (or use a future revoke() call once that lands) so the predecessor’s valid_until is in the past and any verifier honoring the metadata refuses further signatures from it.

pub fn successor_chain(&self, id: &str) -> Result<Vec<KeyId>, KeyError>

Walk the rotation chain forward from id, returning the ordered list of key ids: [id, successor_of_id, ...]. The first element is always id itself. Stops at a key with no successor_key_id.

pub fn valid_keys_at(&self, at_unix_secs: u64) -> Result<Vec<KeyInfo>, KeyError>

Returns the KeyInfo for every key whose valid_until is either unset or strictly after at_unix_secs. The result includes both rotated-but-still-in-grace predecessors and never-rotated keys. Useful for building a verifier’s accept-set as of a given time.

pub fn default_signer(&self) -> Result<Box<dyn Signer>, KeyError>

Returns a boxed Signer for the current default key.

pub fn signer(&self, id: &str) -> Result<Box<dyn Signer>, KeyError>

Returns a boxed Signer for a specific key ID.

pub fn default_key_id(&self) -> Result<KeyId, KeyError>

Returns the default key ID.

pub fn list(&self) -> Result<Vec<KeyInfo>, KeyError>

Lists all keys.

pub fn set_default(&self, id: &str) -> Result<(), KeyError>

Sets the default signing key.

pub fn public_key(&self, id: &str) -> Result<Vec<u8>, KeyError>

Returns the public key bytes for a key ID.