iOS 10 kernel decryption benchmark

main.m

//
//  main.m
//  kern-dec-bench
//
//  Created by Jevin Sweval on 6/23/16.
//  Copyright © 2016 Arxan Technologies, Inc. All rights reserved.
//

#import <UIKit/UIKit.h>
#import "AppDelegate.h"
#import <CommonCrypto/CommonCrypto.h>

int main(int argc, char * argv[]) {
  @autoreleasepool {
    NSString *kernpath = [NSBundle.mainBundle pathForResource:@"kernelcache.release" ofType:@"n66"];
    NSLog(@"kernpath: %@", kernpath);
    NSMutableData *kerndata = [NSMutableData dataWithContentsOfFile:kernpath];
    NSMutableData *key = [NSMutableData dataWithLength:32];
    NSMutableData *iv = [NSMutableData dataWithLength:16];
    size_t outLength;
    NSMutableData *kerndec = [NSMutableData dataWithLength:kerndata.length + kCCBlockSizeAES128];
    CFTimeInterval start = CACurrentMediaTime();
    for (int i = 0; i < 16; ++i) {
    CCCryptorStatus
    result = CCCrypt(kCCEncrypt, // operation
                     kCCAlgorithmAES128, // Algorithm
                     kCCOptionPKCS7Padding, // options
                     key.bytes, // key
                     key.length, // keylength
                     iv.bytes,// iv
                     kerndata.bytes, // dataIn
                     kerndata.length, // dataInLength,
                     kerndec.mutableBytes, // dataOut
                     kerndec.length, // dataOutAvailable
                     &outLength); // dataOutMoved
      assert(result == kCCSuccess);
    }
    CFTimeInterval stop = CACurrentMediaTime();
    NSLog(@"start: %f stop: %f diff: %f", start, stop, stop - start);
    return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
  }
}