CryptoSwift/Sources/CryptoSwift/Padding.swift

//
//  CryptoSwift
//
//  Copyright (C) 2014-2017 Marcin Krzyżanowski <marcin@krzyzanowskim.com>
//  This software is provided 'as-is', without any express or implied warranty.
//
//  In no event will the authors be held liable for any damages arising from the use of this software.
//
//  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:
//
//  - 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.
//  - Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
//  - This notice may not be removed or altered from any source or binary distribution.
//

public protocol PaddingProtocol {
  func add(to: Array<UInt8>, blockSize: Int) -> Array<UInt8>
  func remove(from: Array<UInt8>, blockSize: Int?) -> Array<UInt8>
}

public enum Padding: PaddingProtocol {
  case noPadding, zeroPadding, pkcs7, pkcs5, iso78164

  public func add(to: Array<UInt8>, blockSize: Int) -> Array<UInt8> {
    switch self {
      case .noPadding:
        return to // NoPadding().add(to: to, blockSize: blockSize)
      case .zeroPadding:
        return ZeroPadding().add(to: to, blockSize: blockSize)
      case .pkcs7:
        return PKCS7.Padding().add(to: to, blockSize: blockSize)
      case .pkcs5:
        return PKCS5.Padding().add(to: to, blockSize: blockSize)
      case .iso78164:
        return ISO78164Padding().add(to: to, blockSize: blockSize)
    }
  }

  public func remove(from: Array<UInt8>, blockSize: Int?) -> Array<UInt8> {
    switch self {
      case .noPadding:
        return from //NoPadding().remove(from: from, blockSize: blockSize)
      case .zeroPadding:
        return ZeroPadding().remove(from: from, blockSize: blockSize)
      case .pkcs7:
        return PKCS7.Padding().remove(from: from, blockSize: blockSize)
      case .pkcs5:
        return PKCS5.Padding().remove(from: from, blockSize: blockSize)
      case .iso78164:
        return ISO78164Padding().remove(from: from, blockSize: blockSize)
    }
  }
}