Struct ExtendedSigningKey 

pub struct ExtendedSigningKey {
    pub depth: u8,
    pub child_index: ChildIndex,
    pub signing_key: SigningKey,
    pub chain_code: [u8; 32],
}

An Ed25519 signing key plus the chain code needed to derive its children.

signing_key holds the 32-byte seed form of the Ed25519 key (what SigningKey::as_bytes returns), which is what did:key encoding and Secret::generate_ed25519 consume — the reason SLIP-0010 fits this workspace and BIP32-Ed25519 does not.

Fields

depth: u8

Derivation depth: 0 for the master key.

child_index: ChildIndex

The index this key was derived under. Normal(0) for the master key, which matches SLIP-0010 and the crate this replaces.

signing_key: SigningKey

The Ed25519 signing key at this path.

chain_code: [u8; 32]

The chain code, mixed into every child derivation.

Implementations

impl ExtendedSigningKey

pub fn from_seed(seed: &[u8]) -> Result<Self, Slip10Error>

Derive the master key from a seed.

Errors if the seed is shorter than MIN_SEED_LEN.

pub fn derive<P: AsRef<[ChildIndex]>>( &self, path: &P, ) -> Result<Self, Slip10Error>

Derive along a whole path. An empty path returns a clone of self.

pub fn derive_child(&self, index: ChildIndex) -> Result<Self, Slip10Error>

Derive a single child.

Refuses non-hardened indexes — Ed25519 has no normal derivation.

pub fn verifying_key(&self) -> VerifyingKey

The public key for this signing key.

Trait Implementations

impl Clone for ExtendedSigningKey

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ExtendedSigningKey

Redacted on purpose: the crate this replaces derived Debug, which prints the private key bytes. Anything that logged an ExtendedSigningKey — or a struct containing one — leaked a key into the log.

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

Formats the value using the given formatter.