Take more time to decrypt

[kamalupasena]

Hi i am currently using this library for file decryption and its work fine but the issue i am facing was its take more time to decrypt. my file size around 10 MB and it take around 5mins to decrypt to work. this is my decryption code

let decryptedPart = try! AES(key: keyArray, iv: ivDecodeData, blockMode: .CTR, padding: NoPadding()).decrypt(encrptedPart)

i am working in swift 2.2 and can you give me a solution for this issue ?

[krzyzanowskim]

Upgrade to Swift 3 and use Release build with "whole module optimization" enabled. According to my latest tests it should take ~4s to process 10MB when run on iPhone6 hardware.

[kamalupasena]

i am currently using
pod 'CryptoSwift' , '~>0.5.2'

which version should i use ?

[krzyzanowskim]

0.6.5 or above

[kamalupasena]

is there a way to do it without updating it into swift 3.0 ?

[krzyzanowskim]

For the best performance, you'll need the latest release, Swift 3 compatible. I have no plans to maintain Swift 2.2.

[kamalupasena]

Hi
I have update my code to swift 3 and do same decryption but it still take about 5 min to do the decryption can you tell me what i am doing wrong here ?

[krzyzanowskim]

share you sample project please, to verify

[kamalupasena]

i am using
pod 'CryptoSwift'

let ivDecodeData = Data(base64Encoded: myChapter.iv!, options: [])?.bytes

        let keySha = myChapter.secret!.data(using: String.Encoding.utf8)!.sha1().bytes


        var keyArray = Array<UInt8>()

        for i in 0...15{
            keyArray.append(keySha[i])
        }

        print("Start Time ", NSDate().timeIntervalSince1970)

        let decryptedPart = try! AES(key: keyArray, iv: ivDecodeData, blockMode: .CTR, padding: NoPadding()).decrypt(encrptedPart)

         print("Finished Time ", NSDate().timeIntervalSince1970)

        var decryptedPartSemi = [UInt8]()

ill share the sample project with you but for the time being this is my code snippet

[krzyzanowskim]

no way. I took 7.5 s. on my iPhone 6. You must build it in "debug" mode.

[kamalupasena]

i have created a sample application

Here
and i am testing this on my iPhone 5

[kamalupasena]

Did you able to run the project that i have share with you ?

[krzyzanowskim]

yes, here the results

iPhone6

File Downloading at 100 %
Downloaded file successfully
Decryption Start Time  1478206541.37543
Decryption Finished Time  1478206548.36963
true

iPad Mini (iPhone 4s)

File Downloading at 100 %
Downloaded file successfully
Decryption Start Time  1478213743.40164
Decryption Finished Time  1478213762.92804
true

[kamalupasena]

So what i am doing wrong there ? because i'am getting following results

Start Time 1478213260.39949 Finished Time 1478213607.22812

[krzyzanowskim]

I'm pretty sure you're testing Debug builds, not Release builds.

[kamalupasena]

Can you tell me how to change it ?

[krzyzanowskim]

sure. Like this:

Also... you may want update CryptoSwift target in Pods (as seen in screenshot) to enable "Whole Module Optimization"

[kamalupasena]

Thank you very much, changing it to Release and enable Whole Module Optimization cut the decryption time in to this

Start Time 1478215560.89765 Finished Time 1478215574.24821

Thank you very much again for your support and this awesome library