Decrypting (and encrypting) Large files

[Craig Newman]

Ah, I see.

I did not appreciate that the dataset could be in the many gigabytes.

Craig

> On May 9, 2022, at 12:42 PM, Tom Glod via use-livecode <use-livecode at lists.runrev.com> wrote:
> 
> there is no way to decrypt something that does not fit in memory. with 64
> bit builds the limit is whatever the motherboard  supports.   on 32 bit
> builds the limit is whatever the os will allow 1 process to have,
> but then u need memory to store the decrypted data too.
> you can use a command line program to outsource that work and memory
> management.
> 
> On Mon, May 9, 2022 at 9:44 AM Craig Newman via use-livecode <
> use-livecode at lists.runrev.com> wrote:
> 
>> I believe that there is no upper limit to the size of a variable in LC. So
>> I am with Mike here. What makes you nervous about dealing with a large
>> dataset within LC itself?
>> 
>> Craig
>> 
>>> On May 9, 2022, at 8:49 AM, Mike Kerner via use-livecode <
>> use-livecode at lists.runrev.com> wrote:
>>> 
>>> have you tried ti? i have not run into a situation where a variable was
>> too
>>> big.
>>> 
>>> On Sun, May 8, 2022 at 6:46 PM Mark Clark via use-livecode <
>>> use-livecode at lists.runrev.com> wrote:
>>> 
>>>> Wondering if anyone has used LiveCode for encrypting-decrypting large
>>>> files? The docs typically have nice examples for files that can fit
>> into a
>>>> variable, but what are folks doing for big files that are larger than
>> what
>>>> you’d want in a variable? I’m thinking about using LC for decrypting zip
>>>> compressed log files that can be multiple gigabytes in size. I’d like to
>>>> use just LC vs. resorting to shell if possible.
>>>> 
>>>> Likely need a hash value to compare the decrypted output against the
>>>> original as well. I’m thinking some variation along the lines of open
>> file
>>>> x for read, reading some manageable chunk into memory, decrypting a
>>>> portion, writing that to disk and repeat. But that seems too simple.
>> Think
>>>> we need AES 256. Any shared experience much appreciated.
>>>> 
>>>> Thanks all,
>>>> 
>>>> Mark
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>>> 
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