99 lines
3.7 KiB
Swift
99 lines
3.7 KiB
Swift
//
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// Copyright (c) 2022 Touch Instinct
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the Software), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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import Foundation
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import Security
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open class DefaultTokenCipher: TokenCipher {
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public var saltPreprocessor: SaltPreprocessor
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public var passwordDerivator: PasswordDerivator
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public init(saltPreprocessor: SaltPreprocessor, passwordDerivator: PasswordDerivator) {
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self.saltPreprocessor = saltPreprocessor
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self.passwordDerivator = passwordDerivator
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}
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open func createCipher(iv: Data, key: Data) -> Cipher {
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AESCipher(iv: iv, key: key)
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}
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open func generateIV() -> Data {
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generateRandomData(count: CryptoConstants.ivLength)
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}
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open func generateSalt() -> Data {
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generateRandomData(count: CryptoConstants.saltLength)
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}
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open func generateRandomData(count: Int) -> Data {
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let randomBytes = Array<UInt8>(unsafeUninitializedCapacity: count) { buffer, initializedCount in
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guard let startAddress = buffer.baseAddress,
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SecRandomCopyBytes(kSecRandomDefault,
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count,
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startAddress) == errSecSuccess else {
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initializedCount = .zero
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return
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}
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initializedCount = count
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}
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return Data(randomBytes)
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}
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// MARK: - TokenCipher
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open func derive(password: String, using salt: Data) -> Result<Data, CipherError> {
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passwordDerivator.derive(password: password,
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salt: saltPreprocessor.preprocess(salt: salt))
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}
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open func encrypt(token: Data, using password: String) -> Result<StringEncryptionResult, CipherError> {
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let iv = generateIV()
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let salt = generateSalt()
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return derive(password: password, using: salt)
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.flatMap {
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createCipher(iv: iv, key: $0)
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.encrypt(data: token)
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.map {
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StringEncryptionResult(salt: salt, iv: iv, value: $0)
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}
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}
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}
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open func decrypt(token: StringEncryptionResult, using key: Data) -> Result<Data, CipherError> {
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createCipher(iv: token.iv, key: key)
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.decrypt(data: token.value)
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}
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open func decrypt(token: StringEncryptionResult, using password: String) -> Result<Data, CipherError> {
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passwordDerivator.derive(password: password,
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salt: saltPreprocessor.preprocess(salt: token.salt))
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.flatMap {
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createCipher(iv: token.iv,
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key: $0)
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.decrypt(data: token.value)
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}
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}
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}
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