Re: Checksums and best way to get'em
Re: Checksums and best way to get'em
- Subject: Re: Checksums and best way to get'em
- From: Greg Hulands <email@hidden>
- Date: Wed, 9 Jun 2004 10:13:31 +1000
I think it would be easier to use a different way for you 30 day time
or whatever you are using the date for. Just use NSUserDefaults.
On 09/06/2004, at 9:56 AM, April Gendill wrote:
Not even by turning off the prebinding in the compiler?
April.
On Jun 8, 2004, at 8:38 AM, Shawn Erickson wrote:
You don't.
On Jun 8, 2004, at 8:16 AM, April Gendill wrote:
I guess then that the big question is how do I stop re-binding?
April.
On Jun 8, 2004, at 6:30 AM, Nick Zitzmann wrote:
On Jun 7, 2004, at 11:33 PM, April Gendill wrote:
But i'll try. How would one generate a checksum of a file and then
using that check sum verify whether or not changes have been made
to the file?
One other way of doing this is to use the MD5 or SHA-1 functions
from OpenSSL's libcrypto library. You can then read in the file
using read() or fread(), pass each byte through the "update"
function, and get the final digest from the "final" function. You
can find out more by running an apropos search for "md5" and "sha"
on your computer if you installed the BSD SDK when you installed
Xcode.
If you do a checksum on a file, and it's different than the last
time the checksum was performed, then the file was changed. I
assume you know how to compare strings. Keep in mind that, if
you're using these functions to get the checksum of a prebound
binary, then the checksum will change when the binary is re-bound.
Nick Zitzmann
<http://www.chronosnet.com/>
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