Structure

P256K.Signing.PublicKey

secp256k1 ECDSA public key for verifying P256K.Signing.ECDSASignature values, available in compressed (33-byte) or uncompressed (65-byte) serialized form.

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

struct PublicKey

Mentioned In

Overview

Obtain a public key from its companion publicKey property, or by deserializing a compressed (33-byte), uncompressed (65-byte), PEM, DER, or ANSI X9.63 representation. The serialization format is preserved and reported by the format property. Parsing goes through secp256k1_ec_pubkey_parse (declared in Vendor/secp256k1/include/secp256k1.h), which rejects off-curve points and wrong-length encodings.

Topics

Construction

Serialized Forms

Algebra

var negation: P256K.Signing.PublicKey
A new P256K.Signing.PublicKey that is the additive inverse of this key on the secp256k1 curve, produced by secp256k1_ec_pubkey_negate.

Instance Methods

func add([UInt8], format: P256K.Format) throws -> P256K.Signing.PublicKey
Creates a new P256K.Signing.PublicKey by computing public_key' = public_key + G × tweak via secp256k1_ec_pubkey_tweak_add, where G is the secp256k1 generator point.
func combine([P256K.Signing.PublicKey], format: P256K.Format) throws -> P256K.Signing.PublicKey
Creates a new P256K.Signing.PublicKey by adding this key together with pubkeys via secp256k1_ec_pubkey_combine (declared in Vendor/secp256k1/include/secp256k1.h), equivalent to point addition on the secp256k1 curve.
func isValidSignature<D>(P256K.Signing.ECDSASignature, for: D) -> Bool
Verifies an ECDSA signature against a pre-computed digest using secp256k1_ecdsa_verify, which requires the signature to be in lower-S normalized form.
func isValidSignature<D>(P256K.Signing.ECDSASignature, for: D) -> Bool
Verifies an ECDSA signature by first hashing data with SHA-256, then calling secp256k1_ecdsa_verify.
func multiply([UInt8], format: P256K.Format) throws -> P256K.Signing.PublicKey
Creates a new P256K.Signing.PublicKey by computing public_key' = public_key × tweak via secp256k1_ec_pubkey_tweak_mul.