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Merge pull request #71 from auth0/add-otp-generators
Add OTP Generators
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| @@ -0,0 +1,93 @@ | ||
| // OneTimePasswordGenerator.swift | ||
| // | ||
| // Copyright (c) 2018 Auth0 (http://auth0.com) | ||
| // | ||
| // Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| // of this software and associated documentation files (the "Software"), to deal | ||
| // in the Software without restriction, including without limitation the rights | ||
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| // copies of the Software, and to permit persons to whom the Software is | ||
| // furnished to do so, subject to the following conditions: | ||
| // | ||
| // The above copyright notice and this permission notice shall be included in | ||
| // all copies or substantial portions of the Software. | ||
| // | ||
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | ||
| // THE SOFTWARE. | ||
|
|
||
| import Foundation | ||
|
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| public protocol TOTP { | ||
| func new(time: TimeInterval, period: Int) -> String | ||
| } | ||
|
|
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| extension TOTP { | ||
| public func new(time: TimeInterval = Date().timeIntervalSince1970, period: Int = 30) -> String { | ||
| return self.new(time: time, period: period) | ||
| } | ||
| } | ||
|
|
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| public protocol HOTP { | ||
| func new(counter: Int) -> String | ||
| } | ||
|
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| public func totp(base32Secret: String, algorithm: HMACAlgorithm, digits: Int = 6) throws -> TOTP { | ||
| guard let secret = Base32.decode(string: base32Secret) else { throw GuardianError.invalidBase32Secret } | ||
| return try totp(secret: secret, algorithm: algorithm, digits: digits) | ||
| } | ||
|
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| public func totp(secret: Data, algorithm: HMACAlgorithm, digits: Int = 6) throws -> TOTP { | ||
| return try OneTimePasswordGenerator(secret: secret, algorithm: algorithm, digits: digits) | ||
| } | ||
|
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| public func hotp(secret: Data, algorithm: HMACAlgorithm, digits: Int = 6) throws -> HOTP { | ||
| return try OneTimePasswordGenerator(secret: secret, algorithm: algorithm, digits: digits) | ||
| } | ||
|
|
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| public enum HMACAlgorithm: String { | ||
| case sha1 | ||
| case sha256 | ||
| case sha512 | ||
|
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| func hmac(secret: Data) -> A0HMAC { | ||
| return A0HMAC(algorithm: self.rawValue, key: secret)! | ||
| } | ||
| } | ||
|
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| struct OneTimePasswordGenerator: TOTP, HOTP { | ||
| let digits: Int | ||
| let hmac: A0HMAC | ||
|
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| init(secret: Data, algorithm: HMACAlgorithm, digits: Int) throws { | ||
| self.hmac = algorithm.hmac(secret: secret) | ||
| self.digits = digits | ||
| } | ||
|
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| func new(counter: Int) -> String { | ||
| var c = UInt64(counter).bigEndian | ||
| let buffer = Data(bytes: &c, count: MemoryLayout<UInt64>.size); | ||
| let digestData = hmac.sign(buffer) | ||
| let hash = digestData.withUnsafeBytes { (bytes: UnsafePointer<UInt8>) -> UInt32 in | ||
| let last = bytes.advanced(by: hmac.digestLength - 1) | ||
| let offset = last.pointee & 0x0f | ||
| let start = bytes.advanced(by: Int(offset)) | ||
| let value = start.withMemoryRebound(to: UInt32.self, capacity: 1) { $0 } | ||
| var hash = UInt32(bigEndian: value.pointee) | ||
| hash &= 0x7fffffff | ||
| hash = hash % UInt32(pow(10, Float(digits))) | ||
| return hash | ||
| } | ||
|
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| return String(format: "%0\(digits)d", Int(hash)) | ||
| } | ||
|
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| func new(time: TimeInterval, period: Int) -> String { | ||
| let steps = time / Double(period) | ||
| return self.new(counter: Int(steps)) | ||
| } | ||
| } |
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