encrypt and decrypt on iOS

[Jim sims]

Mike - thanks loads :-)

I was trying to use the dictionary syntax:

*Syntax: *

encrypt *source* using *cipher* with [password|key] *passorkey *[and salt
saltvalue] [and IV *IVvalue*] [at *bitvalue* bit]

I found your explanation much more friendly, in fact got it working first
shot.

We think alike - I already use Monte's mergEXT, excellent Man & stuff. Also
plan on using the DropBox method for some things. Wanted to learn the
native LiveCode version however, i like to go native whenever i can  ;-)

Is there a webpage for the DropBox REST api effort you refer to?

Thanks again,

sims


On Sat, Apr 26, 2014 at 3:53 PM, Mike Kerner <MikeKerner at roadrunner.com>wrote:

> 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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> >
> >
> > --
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> > 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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