//
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// CryptoSwift
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//
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// Copyright (C) 2014-2022 Marcin Krzyżanowski <marcin@krzyzanowskim.com>
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// This software is provided 'as-is', without any express or implied warranty.
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//
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// In no event will the authors be held liable for any damages arising from the use of this software.
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//
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// Permission is granted to anyone to use this software for any purpose,including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions:
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//
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// - The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation is required.
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// - Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
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// - This notice may not be removed or altered from any source or binary distribution.
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//
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public protocol CipherModeWorker {
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var cipherOperation: CipherOperationOnBlock { get }
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// Additional space needed when incrementally process data
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// eg. for GCM combined mode
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var additionalBufferSize: Int { get }
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@inlinable
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mutating func encrypt(block plaintext: ArraySlice<UInt8>) -> Array<UInt8>
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@inlinable
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mutating func decrypt(block ciphertext: ArraySlice<UInt8>) -> Array<UInt8>
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}
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/// Block workers use `BlockEncryptor`
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public protocol BlockModeWorker: CipherModeWorker {
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var blockSize: Int { get }
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}
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public protocol CounterModeWorker: CipherModeWorker {
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associatedtype Counter
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var counter: Counter { get set }
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}
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public protocol SeekableModeWorker: CipherModeWorker {
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mutating func seek(to position: Int) throws
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}
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/// Stream workers use `StreamEncryptor`
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public protocol StreamModeWorker: CipherModeWorker {
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}
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public protocol FinalizingEncryptModeWorker: CipherModeWorker {
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// Any final calculations, eg. calculate tag
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// Called after the last block is encrypted
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mutating func finalize(encrypt ciphertext: ArraySlice<UInt8>) throws -> ArraySlice<UInt8>
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}
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public protocol FinalizingDecryptModeWorker: CipherModeWorker {
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// Called before decryption, hence input is ciphertext.
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// ciphertext is either a last block, or a tag (for stream workers)
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@discardableResult
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mutating func willDecryptLast(bytes ciphertext: ArraySlice<UInt8>) throws -> ArraySlice<UInt8>
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// Called after decryption, hence input is ciphertext
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mutating func didDecryptLast(bytes plaintext: ArraySlice<UInt8>) throws -> ArraySlice<UInt8>
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// Any final calculations, eg. calculate tag
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// Called after the last block is encrypted
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mutating func finalize(decrypt plaintext: ArraySlice<UInt8>) throws -> ArraySlice<UInt8>
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}
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