Structure

P256K.KeyAgreement.XonlyKey

The 32-byte x-only form of a P256K.KeyAgreement.PublicKey, derived via secp256k1_xonly_pubkey_from_pubkey.

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

struct XonlyKey

Overview

Drops the Y-coordinate parity bit from the 33-byte compressed encoding, matching the BIP-340 x-only representation. The 1-bit parity is preserved separately in parity so Taproot-aware ECDH schemes can reconstruct the full point when needed.

Topics

Inspection

var dataRepresentation: Data
The 32-byte X coordinate as Data.
var parity: Bool
true if the full public key’s Y coordinate is odd (the x-only point is the negation of the original pubkey), false if even; as returned by secp256k1_xonly_pubkey_from_pubkey.