//
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// CryptoSwift
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//
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// Copyright (C) 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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import Foundation
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// First byte is 0x80, rest is zero padding
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// http://www.crypto-it.net/eng/theory/padding.html
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// http://www.embedx.com/pdfs/ISO_STD_7816/info_isoiec7816-4%7Bed21.0%7Den.pdf
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struct ISO78164Padding: PaddingProtocol {
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init() {
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}
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@inlinable
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func add(to bytes: Array<UInt8>, blockSize: Int) -> Array<UInt8> {
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var padded = Array(bytes)
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padded.append(0x80)
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while (padded.count % blockSize) != 0 {
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padded.append(0x00)
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}
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return padded
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}
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@inlinable
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func remove(from bytes: Array<UInt8>, blockSize _: Int?) -> Array<UInt8> {
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if let idx = bytes.lastIndex(of: 0x80) {
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return Array(bytes[..<idx])
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} else {
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return bytes
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}
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}
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}
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