crc32 command

[Sascha Hauer]

Hi Benoit,

On Fri, May 13, 2011 at 05:54:00PM +0200, Benoît Burnichon wrote:
> Hi all,
> 
> I want to verify the version downloaded by tftp before installing it.
> 
> I have the file on my workstation:
> 
> $ cksum /var/lib/tftpboot/uImage-pcm038 
> 2156276197 2317276 /var/lib/tftpboot/uImage-pcm038
> 
> Under my barebox, I then try to verify the file:
> 
> barebox:/ crc32
> Usage: crc32 [OPTION] [AREA]
> Calculate a crc32 checksum of a memory area
> Options:
>   -f <file>   Use file instead of memory
>   -v <crc>    Verfify
> 
> barebox:/ crc32 -f uImage-pcm038 -v 2156276197 0+2317276
> CRC32 for uImage-pcm038 0x00000000 ... 0x00235bdb ==> 0xd484eccb != 0x808629e5 ** ERROR **
> barebox:/ crc32 -f uImage-pcm038                        
> CRC32 for uImage-pcm038 0x00000000 ... 0x00235bdb ==> 0xd484eccb
> 
> 
> I have barebox-2010.11.0
> 
> 
> How can I use crc32 to verify the files I transfer?

The algorithms differ, so cksum is not usable here. Got curious myself
and looked around in the net. the zip tool is usable for this:

zip test.zip barebox.bin; unzip -lv test.zip

Ok, this sucks, but there is also a standalone program (haven't tested
this). See here:

http://docwiki.gumstix.org/index.php/Calculating_32_bit_CRCs

Sascha

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