Thanks for the response !
-----Original Message-----
From: cocoa-dev-bounces+anoop.varughese=email@hidden
[mailto:cocoa-dev-bounces+anoop.varughese=email@hidden] On
Behalf Of Nicko van Someren
Sent: Thursday, February 14, 2008 6:34 PM
To: Jens Alfke
Cc: Apple Cocoa-Dev Mailing List
Subject: Re: MD5 check sum of a file
On 13 Feb 2008, at 15:58, Jens Alfke wrote:
> On 13 Feb '08, at 2:49 AM, <email@hidden>
> <email@hidden
> > wrote:
>> I want to find out the md5 check sum of a file while giving the path
>> of the file.
>
> #include <CommonCrypto/CommonDigest.h>
>
> This is Apple's preferred high-level API for generating digests/
> hashes.
Is either the fact that this is preferred, or the header itself,
documented anywhere? Typing either "CommonCrypto" or "CommonDigest"
into the full text search no the latest Xcode yields just one hit in
some example code and no documentation whatsoever.
> If you have a choice of algorithms, and if this involves security at
> all, SHA-1 is a better choice. There are known weaknesses in MD5.
There are known weaknesses in SHA-1 as well (both have viable collision
attacks, neither has a viable second pre-image attack). If the hash is
being used for security then SHA-256 (in the same header
file) would be even better. That said, if all you are doing is checking
that bits didn't get corrupted in transit then MD5 is probably just
fine.
Cheers,
Nicko
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