Enum TempoSignature 

pub enum TempoSignature {
    Primitive(PrimitiveSignature),
    Keychain(KeychainSignature),
}

AA transaction signature supporting multiple signature schemes

Note: Uses custom Compact implementation that delegates to to_bytes() / from_bytes().

Variants

Primitive(PrimitiveSignature)

Primitive signature types: Secp256k1, P256, or WebAuthn

Keychain(KeychainSignature)

Keychain signature - wraps another signature with a key identifier Format: key_id (20 bytes) + inner signature IMP: The inner signature MUST NOT be another Keychain (validated at runtime) Note: Recursion is prevented by KeychainSignature’s custom Arbitrary impl

Implementations

impl TempoSignature

pub fn from_bytes(data: &[u8]) -> Result<Self, &'static str>

Parse signature from bytes with backward compatibility

For backward compatibility with existing secp256k1 signatures:

• If length is 65 bytes: treat as secp256k1 signature (no type identifier)
• Otherwise: first byte is the signature type identifier

pub fn to_bytes(&self) -> Bytes

Encode signature to bytes

For backward compatibility:

• Secp256k1: encoded WITHOUT type identifier (65 bytes)
• P256/WebAuthn: encoded WITH type identifier prefix

pub fn encoded_length(&self) -> usize

Get the length of the encoded signature in bytes

For backward compatibility:

• Secp256k1: 65 bytes (no type identifier)
• P256/WebAuthn: includes 1-byte type identifier prefix

pub fn signature_type(&self) -> SignatureType

Get signature type

pub fn size(&self) -> usize

Get the in-memory size of the signature

pub fn recover_signer(&self, sig_hash: &B256) -> Result<Address, RecoveryError>

Recover the signer address from the signature

This function verifies the signature and extracts the address based on signature type:

• secp256k1: Uses standard ecrecover (signature verification + address recovery)
• P256: Verifies P256 signature then derives address from public key
• WebAuthn: Parses WebAuthn data, verifies P256 signature, derives address
• Keychain: Validates inner signature and returns user_address

For Keychain signatures, this performs full validation of the inner signature. The access key address is cached in the KeychainSignature for later use. Note: This pattern has a big footgun, that someone using recover_signer, cannot assume that the signature is valid for the keychain. They also need to check the access key is authorized in the keychain precompile. We cannot check this here, as we don’t have access to the keychain precompile.

pub fn is_keychain(&self) -> bool

Check if this is a Keychain signature

pub fn is_legacy_keychain(&self) -> bool

Check if this is a legacy V1 Keychain signature (deprecated at T1C).

pub fn is_v2_keychain(&self) -> bool

Check if this is a V2 Keychain signature.

pub fn validate_version(&self, is_t1c: bool) -> Result<(), KeychainVersionError>

Validates keychain signature version compatibility with the current hardfork.

• Post-T1C: legacy V1 keychain signatures are rejected.
• Pre-T1C: V2 keychain signatures are rejected to prevent chain splits.

pub fn as_keychain(&self) -> Option<&KeychainSignature>

Get the Keychain signature if this is a Keychain signature

Trait Implementations

impl<'arbitrary> Arbitrary<'arbitrary> for TempoSignature

fn arbitrary(u: &mut Unstructured<'arbitrary>) -> Result<Self>

Generate an arbitrary value of Self from the given unstructured data.

fn arbitrary_take_rest(u: Unstructured<'arbitrary>) -> Result<Self>

Generate an arbitrary value of Self from the entirety of the given unstructured data.

fn size_hint(depth: usize) -> (usize, Option<usize>)

Get a size hint for how many bytes out of an Unstructured this type needs to construct itself.

fn try_size_hint( depth: usize, ) -> Result<(usize, Option<usize>), MaxRecursionReached>

Get a size hint for how many bytes out of an Unstructured this type needs to construct itself.

impl Clone for TempoSignature

fn clone(&self) -> TempoSignature

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Compact for TempoSignature

Available on crate feature reth-codec only.

fn to_compact<B>(&self, buf: &mut B) -> usize

where B: BufMut + AsMut<[u8]>,

Takes a buffer which can be written to. Ideally, it returns the length written to.

fn from_compact(buf: &[u8], len: usize) -> (Self, &[u8])

Takes a buffer which can be read from. Returns the object and buf with its internal cursor advanced (eg..advance(len)).

fn specialized_to_compact<B>(&self, buf: &mut B) -> usize

where B: BufMut + AsMut<[u8]>,

“Optional”: If there’s no good reason to use it, don’t.

fn specialized_from_compact(buf: &[u8], len: usize) -> (Self, &[u8])

“Optional”: If there’s no good reason to use it, don’t.

impl Debug for TempoSignature

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

Formats the value using the given formatter.

impl Decodable for TempoSignature

fn decode(buf: &mut &[u8]) -> Result<Self>

Decodes the blob into the appropriate type. buf must be advanced past the decoded object.

impl Default for TempoSignature

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for TempoSignature

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Encodable for TempoSignature

fn encode(&self, out: &mut dyn BufMut)

Encodes the type into the out buffer.

fn length(&self) -> usize

Returns the length of the encoding of this type in bytes.

impl From<Signature> for TempoSignature

fn from(signature: Signature) -> Self

Converts to this type from the input type.

impl Hash for TempoSignature

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for TempoSignature

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

Tests for self and other values to be equal, and is used by ==.

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

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

impl Serialize for TempoSignature

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for TempoSignature

impl StructuralPartialEq for TempoSignature

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 216 bytes

Size for each variant:

• Primitive: 168 bytes
• Keychain: 216 bytes