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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,60 @@ | ||
| // | ||
| // BIP39.swift | ||
| // TangemSdk | ||
| // | ||
| // Created by Alexander Osokin on 06.03.2023. | ||
| // Copyright © 2023 Tangem AG. All rights reserved. | ||
| // | ||
|
|
||
| import Foundation | ||
|
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||
| @available(iOS 13.0, *) | ||
| public struct BIP39 { | ||
| /// Generate a mnemonic. | ||
| /// - Parameters: | ||
| /// - entropyLength: An entropy length to use. Default is 128 bit. | ||
| /// - wordlist: A wordlist to use. Default is english. | ||
| /// - Returns: Generated mnemonic | ||
| public func generateMnemonic(entropyLength: EntropyLength = .bits128, wordlist: Wordlist = .en) throws -> [String] { | ||
| guard entropyLength.rawValue % 32 == 0 else { | ||
| throw MnemonicError.mnenmonicCreationFailed | ||
| } | ||
|
|
||
| let entropyBytesCount = entropyLength.rawValue / 8 | ||
| let entropyData = try CryptoUtils.generateRandomBytes(count: entropyBytesCount) | ||
| return try generateMnemonic(from: entropyData, wordlist: wordlist) | ||
| } | ||
|
|
||
| /// Generate a mnemonic from data. Useful for testing purposes. | ||
| /// - Parameters: | ||
| /// - data: Entropy data in hex format | ||
| /// - wordlist: A wordlist to use. | ||
| /// - Returns: Generated mnemonic | ||
| func generateMnemonic(from entropyData: Data, wordlist: Wordlist) throws -> [String] { | ||
| guard let entropyLength = EntropyLength(rawValue: entropyData.count * 8) else { | ||
| throw MnemonicError.invalidEntropyLength | ||
| } | ||
|
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| let entropyHashBits = entropyData.getSha256().toBits() | ||
| let checksumBitLength = entropyLength.rawValue / 32 | ||
| let entropyChecksumBits = entropyHashBits.prefix(checksumBitLength) | ||
|
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| let entropyBits = entropyData.toBits() | ||
| let concatenatedBits = entropyBits + entropyChecksumBits | ||
| let bitIndexes = concatenatedBits.chunked(into: 11) | ||
| let indexes = bitIndexes.compactMap { Int($0.joined(), radix: 2) } | ||
|
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| guard indexes.count == entropyLength.wordsCount else { | ||
| throw MnemonicError.mnenmonicCreationFailed | ||
| } | ||
|
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| let allWords = wordlist.words | ||
|
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| guard indexes.allSatisfy({ $0 < allWords.count }) else { | ||
| throw MnemonicError.mnenmonicCreationFailed | ||
| } | ||
|
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| let words = indexes.map { allWords[$0] } | ||
| return words | ||
| } | ||
| } |
27 changes: 27 additions & 0 deletions
27
TangemSdk/TangemSdk/Common/HDWallet/BIP39/EntropyLength.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,27 @@ | ||
| // | ||
| // EntropyLength.swift | ||
| // TangemSdk | ||
| // | ||
| // Created by Alexander Osokin on 01.03.2023. | ||
| // Copyright © 2023 Tangem AG. All rights reserved. | ||
| // | ||
|
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| import Foundation | ||
|
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| public enum EntropyLength: Int { | ||
| case bits128 = 128 | ||
| case bits160 = 160 | ||
| case bits192 = 192 | ||
| case bits224 = 224 | ||
| case bits256 = 256 | ||
|
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| var wordsCount: Int { | ||
| switch self { | ||
| case .bits128: return 12 | ||
| case .bits160: return 15 | ||
| case .bits192: return 18 | ||
| case .bits224: return 21 | ||
| case .bits256: return 24 | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,16 @@ | ||
| // | ||
| // Mnemonic.swift | ||
| // TangemSdk | ||
| // | ||
| // Created by Alexander Osokin on 01.03.2023. | ||
| // Copyright © 2023 Tangem AG. All rights reserved. | ||
| // | ||
|
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| import Foundation | ||
|
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| @available(iOS 13.0, *) | ||
| public enum Mnemonic { | ||
| public static func generateMnemonic(entropyLength: EntropyLength, wordlist: Wordlist) throws { | ||
|
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| } | ||
| } |
16 changes: 16 additions & 0 deletions
16
TangemSdk/TangemSdk/Common/HDWallet/BIP39/MnemonicError.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,16 @@ | ||
| // | ||
| // MnemonicError.swift | ||
| // TangemSdk | ||
| // | ||
| // Created by Alexander Osokin on 01.03.2023. | ||
| // Copyright © 2023 Tangem AG. All rights reserved. | ||
| // | ||
|
|
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| import Foundation | ||
|
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| public enum MnemonicError: Error { | ||
| case invalidEntropyLength | ||
| case invalidWordCount | ||
| case invalidWordsFile | ||
| case mnenmonicCreationFailed | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,40 @@ | ||
| // | ||
| // Wordlist.swift | ||
| // TangemSdk | ||
| // | ||
| // Created by Alexander Osokin on 01.03.2023. | ||
| // Copyright © 2023 Tangem AG. All rights reserved. | ||
| // | ||
|
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| import Foundation | ||
|
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| @available(iOS 13.0, *) | ||
| public enum Wordlist { | ||
| case en | ||
|
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| /// This var reads a big array from a file | ||
| public var words: [String] { | ||
| (try? readWords(from: fileName)) ?? [] | ||
| } | ||
|
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| private var fileName: String { | ||
| switch self { | ||
| case .en: | ||
| return "english" | ||
| } | ||
| } | ||
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| private func readWords(from fileName: String) throws -> [String] { | ||
| guard let path = Bundle.sdkBundle.path(forResource: fileName, ofType: "txt") else { | ||
| throw MnemonicError.invalidWordsFile | ||
| } | ||
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| let content = try String(contentsOfFile: path, encoding: .utf8) | ||
| let words = content.trim().components(separatedBy: "\n") | ||
| guard words.count == 2048 else { | ||
| throw MnemonicError.invalidWordCount | ||
| } | ||
|
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| return words | ||
| } | ||
| } |
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