68 lines
2.3 KiB
Swift
68 lines
2.3 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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public struct StringEncryptionResult {
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public struct DataRangeMismatch: Error {
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public let dataLength: Int
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public let valueRangeLowerBound: Int
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}
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public let salt: Data
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public let iv: Data
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public let value: Data
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private static var saltRange: Range<Int> {
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.zero..<CryptoConstants.saltLength
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}
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private static var ivRange: Range<Int> {
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saltRange.endIndex..<CryptoConstants.saltLength + CryptoConstants.ivLength
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}
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private static var valueRange: PartialRangeFrom<Int> {
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ivRange.endIndex...
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}
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public init(salt: Data, iv: Data, value: Data) {
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self.salt = salt
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self.iv = iv
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self.value = value
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}
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public init(storableData: Data) throws {
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guard Self.valueRange.contains(storableData.endIndex) else {
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throw DataRangeMismatch(dataLength: storableData.count,
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valueRangeLowerBound: Self.valueRange.lowerBound)
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}
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self.init(salt: storableData[Self.saltRange],
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iv: storableData[Self.ivRange],
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value: storableData[Self.valueRange])
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}
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public func asStorableData() -> Data {
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salt + iv + value
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}
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}
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