//
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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 final class CBCMAC: CMAC {
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public override func authenticate(_ bytes: Array<UInt8>) throws -> Array<UInt8> {
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var inBytes = bytes
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bitPadding(to: &inBytes, blockSize: CMAC.BlockSize)
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let blocks = inBytes.batched(by: CMAC.BlockSize)
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var lastBlockEncryptionResult: [UInt8] = CBCMAC.Zero
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try blocks.forEach { block in
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let aes = try AES(key: Array(key), blockMode: CBC(iv: lastBlockEncryptionResult), padding: .noPadding)
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lastBlockEncryptionResult = try aes.encrypt(block)
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}
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return lastBlockEncryptionResult
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}
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}
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