45 lines
1.8 KiB
Swift
45 lines
1.8 KiB
Swift
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import Foundation
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import CryptoKit
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/// spec, раздел "Мнемоника и seed → Каноническая wordlist".
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/// 2048 lowercase ASCII слов, sorted lexicographically.
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/// Binding fingerprint: SHA-256(canonical_bytes) =
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/// 2f5eed53a4727b4bf8880d8f3f199efc90e58503646d9ff8eff3a2ed3b24dbda
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enum Wordlist {
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static let canonical: [String] = {
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guard let url = Bundle.main.url(forResource: "wordlist", withExtension: "txt"),
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let raw = try? String(contentsOf: url, encoding: .ascii)
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else {
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fatalError("Resources/wordlist.txt отсутствует или повреждён")
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}
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let words = raw.split(separator: "\n").map { String($0) }
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precondition(words.count == 2048, "wordlist должен содержать ровно 2048 слов, получено \(words.count)")
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return words
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}()
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/// Binary search index слова в canonical wordlist.
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static func index(of word: String) -> UInt16? {
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var lo = 0
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var hi = canonical.count
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while lo < hi {
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let mid = (lo + hi) / 2
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if canonical[mid] < word {
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lo = mid + 1
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} else if canonical[mid] > word {
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hi = mid
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} else {
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return UInt16(mid)
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}
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}
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return nil
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}
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/// Verify binding fingerprint при старте приложения (spec обязательное правило).
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static func verifyBindingFingerprint() -> Bool {
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let canonicalBytes = canonical.map { $0 + "\n" }.joined().data(using: .ascii)!
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let hash = SHA256.hash(data: canonicalBytes)
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let hex = hash.map { String(format: "%02x", $0) }.joined()
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return hex == "2f5eed53a4727b4bf8880d8f3f199efc90e58503646d9ff8eff3a2ed3b24dbda"
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}
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}
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