[aerogear-dev] iOS Crypto findings

[Corinne Krych]

Hi All,

Discussing with iOS team with all possible options taking into account OS licenses and encryption algorithms coverage, we'd like to move forward investigating openSSL srtarting with this interesting entry point:
> https://github.com/x2on/OpenSSL-for-iPhone


We'll tell you more soon. 
++
Corinne.

On Oct 10, 2013, at 9:36 PM, Corinne Krych <corinnekrych at gmail.com> wrote:

> According to 
> https://gist.github.com/cvasilak/b967893655a04cbe5b7b#file-gistfile1-txt-L669
> CBC is supported. 
> 
> Maybe it's worth investigating OpenSSL vs PolarSSL iOS support.
> Interesting work dto dig further
> https://github.com/x2on/OpenSSL-for-iPhone
> http://x2on.de/2010/12/16/tutorial-script-for-building-openssl-for-ios-iphoneipad/
> or
> https://github.com/x2on/PolarSSL-for-iOS
> 
> ++
> Corinne
> 
> On Oct 10, 2013, at 8:39 PM, Bruno Oliveira <bruno at abstractj.org> wrote:
> 
>> Aloha, looks like Apple wants to hide all the good crypto! Have you got
>> the chance to look at this? https://github.com/rnapier/RNCryptor I also
>> see some developers using OpenSSL as an alternative. My suggestion:
>> 
>> a) If you think this item is tricky to implement atm consider AES with
>> CBC or AES with CCM (We can support it on the server if necessary). I
>> was trying to find which modes is currently supported but looks like the
>> documentation is super safe, because I can't find it
>> 
>> b) It can be done with OpenSSL in the worst case scenario (not saying is
>> a piece of cake to do, just possible). Let's start simple first.
>> 
>> Regarding http://www.cryptopp.com/ looks like they have all that we
>> need, maybe worth to take a look at this. What do you think? Off the top
>> of my head I only can see 3 alternatives:
>> 
>> 1- Implement encryption with what CommonCrypto provides
>> 2- Try cryptopp or another alternative
>> 3- Implement it with OpenSSL. For example SilentCircle make use of
>> PolarSSL
>> https://github.com/SilentCircle/silent-phone-base/tree/master/libs. I'm
>> not saying to do the same, just an example.
>> 
>>> Christos Vasilakis <mailto:cvasilak at gmail.com>
>>> October 10, 2013 2:29 PM
>>> Hi team,
>>> 
>>> I am digging on the CommonCrypto API and I found some issues.
>>> Specifically:
>>> 
>>> a)  GCM mode for AES symmetric encryption is part of a private API.
>>> See [1] the public interface of the current definitions of supported
>>> modes of operation. 'kCCModeGCM' is missing _although_ digging on the
>>> source code of the apple's web site it is defined in [2]  'private'
>>> (The file is included from a private interface here [3]).  Also here
>>> is the implementation of the GCM mode in [4] and test cases that
>>> exercise it [5]. Not sure why Apple left it out in public. On my
>>> search, one area in which they use this mode is on the KeyChain from
>>> iOS 5 onwards, see 'KeyChain' section here [6]
>>> 
>>> b) Generation of asymmetric  ECC keys and encryption is supported by
>>> CommonCrypto but _again_ under a private interface, see [7] and [8].
>>> ECC is used in the protection class
>>> 'NSFileProtectionCompleteUnlessOpen' according to the iOS Security doc
>>> here [9]. In the meeting there was a plan B for it, RSA with Diffie
>>> Hellman. I am looking at it, but to my current knowledge is supported
>>> if you trust the apple docs here [10] 
>>> 
>>> My worry is how can we proceed with the first issue.
>>> 
>>> As a side note, during my search I discovered Crypto++ [11] , which
>>> seems to offer many of the features we are trying to support. Con is a
>>> C++ interface although an iOS distribution of it exists (see [12]),
>>> and there is an iOS wiki page in the library home page [13].  Needs
>>> more research.
>>> 
>>> Thanks,
>>> Christos
>>> 
>>> 
>>> [1] https://gist.github.com/cvasilak/b967893655a04cbe5b7b#file-gistfile1-txt-L667
>>> [2] https://github.com/Apple-FOSS-Mirror/CommonCrypto/blob/master/Source/CommonCryptoSPI/CommonCryptorSPI.h#L70
>>> [3] https://github.com/Apple-FOSS-Mirror/CommonCrypto/blob/master/Source/CommonCryptoSPI/CommonCryptoPriv.h
>>> [4] https://github.com/Apple-FOSS-Mirror/CommonCrypto/blob/master/Source/API/CommonGCMCryptor.c
>>> [5] https://github.com/Apple-FOSS-Mirror/CommonCrypto/blob/master/CCRegression/CommonCrypto/CommonCryptoSymGCM.c
>>> [6] http://esec-lab.sogeti.com/post/iOS-5-data-protection-updates
>>> [7] https://github.com/Apple-FOSS-Mirror/CommonCrypto/blob/master/Source/CommonCryptoSPI/CommonECCryptor.h
>>> [8] https://github.com/Apple-FOSS-Mirror/CommonCrypto/blob/master/Source/API/CommonECCryptor.c
>>> [9] http://www.apple.com/ipad/business/docs/iOS_Security_Oct12.pdf
>>> [10]https://developer.apple.com/library/ios/documentation/security/conceptual/cryptoservices/CryptographyConcepts/CryptographyConcepts.html#//apple_ref/doc/uid/TP40011172-CH8-CHDCCDIA
>>> [11] http://www.cryptopp.com <http://www.cryptopp.com/>
>>> [12] https://github.com/noloader/cryptopp-5.6.2-ios
>>> [13] http://www.cryptopp.com/wiki/IOS_(Xcode)
>>> <http://www.cryptopp.com/wiki/IOS_%28Xcode%29>
>>> _______________________________________________
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>>> aerogear-dev at lists.jboss.org
>>> https://lists.jboss.org/mailman/listinfo/aerogear-dev
>> 
>> -- 
>> abstractj
>> 
>> 
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