encrypt and decrypt on iOS

Mike Kerner MikeKerner at roadrunner.com
Sat Apr 26 15:53:39 CEST 2014


One more thing - don't forget to decode before you decrypt.


On Sat, Apr 26, 2014 at 9:52 AM, Mike Kerner <MikeKerner at roadrunner.com>wrote:

> Jim,
>
> There are two ways to do encryption on ios in LC:
> 1) Monte has an encryption external in his mergEXT suite
> 2) You can use the native code.  The native code uses OpenSSL.  Due to
> some technical issues it CAN be less secure than the libraries that Monte
> is using, but that is something for you to decide.
>
> You should also encode the encrypted data (AFTER encryption) to ensure
> that it transports properly.
>
> The syntax looks like this, assuming:
> * The data you want to encrypt is in "what"
>  * The cipher you want to use is aes-256
> * The key you want to use to do the encryption is in "theKey"
>
>
> encrypt what using "aes-256-cbc" with theKey
> put base64encode(it) into what #v. 1.6 was bit16
>
>
> From here you would either embed "what" into an email or write to a file
> and attach the file.
>
>
> If it was me, and I was helping you, I would suggest that you do not send
> email from ios, but that you use dropbox, because if you send email, your
> user will get a chance to see the email and thus screw something up, maybe
> by sending the encrypted data to somewhere else, or if you are directly
> embedding the "what" container in an email, by accidentally deleting or
> adding a character, or maybe a helpful introduction like "Here's the
> email", which will screw up your decryption, of course.
>
> Dropbox integration is fairly straightforward.  Monte has a couple of
> externals in the mergEXT suite, and there is also an open-source library
> that several of us have worked on that works (but it is arguably not as
> fast as Monte's external, because it relies on Dropbox's REST API, so your
> app will, in effect, have to sit there while the file(s) transfer).
>
>
>
> On Sat, Apr 26, 2014 at 3:16 AM, Jim sims <sims at ezpzapps.com> wrote:
>
>> Am trying to figure out how to use the new Encrypt/Decrypt with iOS.
>>
>> I want to encrypt a few hundred words of data then send as a file
>> attachment via email. I have zero idea what PEM format and such are.
>>
>> Anyone have a stack that shows how this is done?
>>
>> Would be great to have example stacks for new commands and features when
>> new versions come out.
>>
>> sims
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>
>
>
> --
> On the first day, God created the heavens and the Earth
> On the second day, God created the oceans.
> On the third day, God put the animals on hold for a few hours,
>    and did a little diving.
> And God said, "This is good."
>



-- 
On the first day, God created the heavens and the Earth
On the second day, God created the oceans.
On the third day, God put the animals on hold for a few hours,
   and did a little diving.
And God said, "This is good."


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