//
//  CipherTests.swift
//  CryptoSwift
//
//  Created by Marcin Krzyzanowski on 29/08/14.
//  Copyright (c) 2014 Marcin Krzyzanowski. All rights reserved.
//

import Foundation
import XCTest
import CryptoSwift

class CipherTests: XCTestCase {

    override func setUp() {
        super.setUp()
    }
    
    override func tearDown() {
        super.tearDown()
    }
    
    func testAES() {
        // 256 bit key
        var key:[Byte] = [Byte](count: 32, repeatedValue: 0)
        for i:Byte in 0..<Byte(key.count) {
            key[Int(i)] = i
        }
        
        var input:[Byte] = [0x00, 0x11, 0x22, 0x33,
            0x44, 0x55, 0x66, 0x77,
            0x88, 0x99, 0xaa, 0xbb,
            0xcc, 0xdd, 0xee, 0xff];
        
        let aes = AES() // 256
        let w = aes.keyExpansion(NSData.withBytes(key))
    }
    
    func testPoly1305() {
        let key:[Byte] = [0xdd,0xde,0xdf,0xe0,0xe1,0xe2,0xe3,0xe4,0xe5,0xe6,0xe7,0xe8,0xe9,0xea,0xeb,0xec,0xed,0xee,0xef,0xf0,0xf1,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7,0xf8,0xf9,0xfa,0xfb,0xfc]
        let msg:[Byte] = [0x79,0x7a,0x7b,0x7c,0x7d,0x7e,0x7f,0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8a,0x8b,0x8c,0x8d,0x8e,0x8f,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9a,0x9b,0x9c,0x9d,0x9e,0x9f,0xa0,0xa1,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7,0xa8,0xa9,0xaa,0xab,0xac,0xad,0xae,0xaf,0xb0,0xb1,0xb2,0xb3,0xb4,0xb5,0xb6,0xb7,0xb8,0xb9,0xba,0xbb,0xbc,0xbd,0xbe,0xbf,0xc0,0xc1]
        let expectedMac:[Byte] = [0xdd,0xb9,0xda,0x7d,0xdd,0x5e,0x52,0x79,0x27,0x30,0xed,0x5c,0xda,0x5f,0x90,0xa4]
        
        let mac = Authenticator.Poly1305(key: NSData.withBytes(key)).authenticate(NSData.withBytes(msg))
        XCTAssertEqual(mac!, NSData.withBytes(expectedMac), "Invalid authentication result")
        
        // extensions
        let msgData = NSData.withBytes(msg)
        let mac2 = msgData.authenticate(Authenticator.Poly1305(key: NSData.withBytes(key)))
        XCTAssertNotNil(mac2, "")
        XCTAssertEqual(mac2!, NSData.withBytes(expectedMac), "Invalid authentication result")
    }

    func testChaCha20() {
        let keys:[[Byte]] = [
            [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
            [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01],
            [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
            [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
            [0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F]
        ]
        
        let ivs:[[Byte]] = [
            [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
            [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
            [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01],
            [0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
            [0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07]
        ]
        
        let expectedHexes = [
            "76B8E0ADA0F13D90405D6AE55386BD28BDD219B8A08DED1AA836EFCC8B770DC7DA41597C5157488D7724E03FB8D84A376A43B8F41518A11CC387B669B2EE6586",
            "4540F05A9F1FB296D7736E7B208E3C96EB4FE1834688D2604F450952ED432D41BBE2A0B6EA7566D2A5D1E7E20D42AF2C53D792B1C43FEA817E9AD275AE546963",
            "DE9CBA7BF3D69EF5E786DC63973F653A0B49E015ADBFF7134FCB7DF137821031E85A050278A7084527214F73EFC7FA5B5277062EB7A0433E445F41E3",
            "EF3FDFD6C61578FBF5CF35BD3DD33B8009631634D21E42AC33960BD138E50D32111E4CAF237EE53CA8AD6426194A88545DDC497A0B466E7D6BBDB0041B2F586B",
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
        ]

        for (var idx = 0; idx < keys.count; idx++) {
            let keyData = NSData(bytes: keys[idx], length: keys[idx].count)
            let ivData = NSData(bytes: ivs[idx], length: ivs[idx].count)
            
            let expectedHex = expectedHexes[idx]
            //println(countElements(expectedHex) / 2);
            let message = [Byte](count: (countElements(expectedHex) / 2), repeatedValue: 0)
            let messageData = NSData(bytes: message, length: message.count);
            
            let setup = (key: keyData, iv: ivData)
            var encrypted = Cipher.ChaCha20(setup).encrypt(messageData)
            XCTAssertNotNil(encrypted, "")
            if let encrypted = encrypted {
                var decrypted = Cipher.ChaCha20(setup).decrypt(encrypted)
                XCTAssertNotNil(decrypted, "")
                if let decrypted = decrypted {
                    XCTAssertEqual(messageData, decrypted, "ChaCha20 decryption failed");
                }

                // check extension
                let encrypted2 = messageData.encrypt(Cipher.ChaCha20(setup))
                XCTAssertNotNil(encrypted2, "")
                if let encrypted2 = encrypted2 {
                    XCTAssertEqual(encrypted, encrypted2, "ChaCha20 extension failed")
                }
            }
        }
    }
}