60 lines
1.5 KiB
Swift
60 lines
1.5 KiB
Swift
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//
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// NodePublicKey.swift
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// wallet
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//
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// Created by Jason van den Berg on 2020/08/20.
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// Copyright © 2020 Jason. All rights reserved.
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//
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import Foundation
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class NodePublicKey {
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enum NodePublicKeyErrors: Error {
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case invalidHexString
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case invalidByte
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case invalidByteLength
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}
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private let bytes: [UInt8]
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let hexString: String
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var data: Data {
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return Data(bytes)
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}
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init(_ hexString: String) throws {
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let length = hexString.count
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// Must start with 02 or 03 as according to SECP256K1
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guard hexString.hasPrefix("02") || hexString.hasPrefix("03") else {
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throw NodePublicKeyErrors.invalidHexString
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}
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// Must be even characters
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guard length & 1 == 0 else {
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throw NodePublicKeyErrors.invalidHexString
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}
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var bytes = [UInt8]()
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bytes.reserveCapacity(length / 2)
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var index = hexString.startIndex
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for _ in 0..<length / 2 {
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let nextIndex = hexString.index(index, offsetBy: 2)
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guard let byte = UInt8(hexString[index..<nextIndex], radix: 16) else {
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throw NodePublicKeyErrors.invalidByte
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}
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bytes.append(byte)
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index = nextIndex
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}
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// Must be 33 bytes in length for compressed bitcoin public key
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guard bytes.count == 33 else {
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throw NodePublicKeyErrors.invalidByteLength
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}
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self.bytes = bytes
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self.hexString = hexString
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}
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}
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