P256K
P256K
P256K.Schnorr
P256K.Schnorr.XonlyKey

Structure

P256K.Schnorr.XonlyKey

The corresponding x-only public key for the secp256k1 curve, as defined by BIP-340.

iOS 13.0+
macCatalyst 13.0+
macOS 10.15+
tvOS 13.0+
visionOS 1.0+
watchOS 6.0+

struct XonlyKey

Mentioned In

Overview

X-only keys drop the Y-coordinate parity bit from the 33-byte compressed encoding, matching the representation BIP-340 verifiers consume directly. The 1-bit parity is preserved separately as parity so Taproot tweak verification can reconstruct the full (x, y) point.

Topics

Inspection

Construction

init<D>(dataRepresentation: D, keyParity: Int32, cache: [UInt8])
Creates an x-only public key from a 32-byte X-coordinate, parity bit, and optional pre-computed full-pubkey cache.

Operators

static func == (P256K.Schnorr.XonlyKey, P256K.Schnorr.XonlyKey) -> Bool
Determines if two x-only keys are equal.

Instance Methods

func add([UInt8]) throws -> P256K.Schnorr.XonlyKey
Creates a new P256K.Schnorr.XonlyKey by applying a BIP-341 Taproot tweak to the x-only public key via secp256k1_xonly_pubkey_tweak_add and verifies the result with secp256k1_xonly_pubkey_tweak_add_check.
func isValid(P256K.Schnorr.SchnorrSignature, for: inout [UInt8]) -> Bool
Verifies a Schnorr signature over an arbitrary-length message using secp256k1_schnorrsig_verify.
func isValidSignature<D>(P256K.Schnorr.SchnorrSignature, for: D) -> Bool
Verifies a BIP-340 Schnorr signature against a pre-computed digest using secp256k1_schnorrsig_verify.