//
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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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// Electronic codebook (ECB)
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//
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public struct ECB: BlockMode {
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public let options: BlockModeOption = .paddingRequired
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public let customBlockSize: Int? = nil
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public init() {
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}
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public func worker(blockSize: Int, cipherOperation: @escaping CipherOperationOnBlock, encryptionOperation: @escaping CipherOperationOnBlock) throws -> CipherModeWorker {
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ECBModeWorker(blockSize: blockSize, cipherOperation: cipherOperation)
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}
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}
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struct ECBModeWorker: BlockModeWorker {
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typealias Element = Array<UInt8>
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let cipherOperation: CipherOperationOnBlock
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let blockSize: Int
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let additionalBufferSize: Int = 0
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init(blockSize: Int, cipherOperation: @escaping CipherOperationOnBlock) {
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self.blockSize = blockSize
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self.cipherOperation = cipherOperation
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}
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@inlinable
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mutating func encrypt(block plaintext: ArraySlice<UInt8>) -> Array<UInt8> {
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guard let ciphertext = cipherOperation(plaintext) else {
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return Array(plaintext)
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}
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return ciphertext
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}
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mutating func decrypt(block ciphertext: ArraySlice<UInt8>) -> Array<UInt8> {
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self.encrypt(block: ciphertext)
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}
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}
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