Re: pack it in

[Zoltán Németh <znemeth@xxxxxxxxxxxxxx>]

2008. 01. 25, péntek keltezéssel 00.20-kor Jochem Maas ezt írta:
> someone asked about checksum values in another thread, I believe
> he got his answer no thanks to me. but whilst I was trying to help
> I got stuck playing with pack/unpack.
> 
> so now I have the broadbrush question of what would one use
> pack/unpack for? can anyone point at some realworld examples/code that
> might help me broaden my horizons?
> 

I have used pack in my password decrypt function:

function encode_pwd($text) {
   $size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
   $iv = mcrypt_create_iv($size, MCRYPT_DEV_RANDOM);
   return bin2hex(mcrypt_encrypt(MCRYPT_RIJNDAEL_256,
     md5('secret key goes here'),
     $text,
     MCRYPT_MODE_ECB,
     $iv
   ));
}

function decode_pwd($encrypted_text) {
   $size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
   $iv = mcrypt_create_iv($size, MCRYPT_DEV_RANDOM);
   return trim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256,
     md5('secret key goes here'),
     pack("H*", $encrypted_text),
     MCRYPT_MODE_ECB,
     $iv
   ));
}

greets
Zoltán Németh

> rds,
> jochem
> 

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