Is this good enough encryption for daily use ?
FYI, I need to keep the first part of the file unencrypted so the file
will progressively load
Functions were taken from the mycrypt php page :)
$chunkSize = 32768;
$key = "6q9nKLg5"
if( $fd = fopen($filepath, 'rb')){
while(!feof($fd)) {
if($gotFastStartHeaders != true){
echo fread($fd, $chunkSize/30);
$gotFastStartHeaders = true;
}else{
echo encrypt(fread($fd, $chunkSize));
}
}
fclose ($fd);
exit;
}
/
/-----------------------------------------------------------------------
-------------------
// Encrypt
function encrypt($encrypt) {
global $key;
//$key = "6q9nEUg5";
srand((double) microtime() * 1000000); //for sake of MCRYPT_RAND
$iv = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256,
MCRYPT_MODE_ECB), MCRYPT_RAND);
$passcrypt = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $encrypt,
MCRYPT_MODE_ECB, $iv);
$encode = base64_encode($passcrypt);
return $encode;
}
/
/-----------------------------------------------------------------------
-------------------
// Decrypt
function decrypt($decrypt) {
global $key;
$decoded = base64_decode($decrypt);
$iv = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256,
MCRYPT_MODE_ECB), MCRYPT_RAND);
$decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, $decoded,
MCRYPT_MODE_ECB, $iv);
return $decrypted;
many thanks
g
On Sep 24, 2005, at 2:25 PM, Jasper Bryant-Greene wrote:
Graham Anderson wrote:
How do you display raw binary data of a file sent from a server
with curl ?
You can probably just use file_get_contents() if allow_url_fopen is
enabled (it is by default).
For binary data, base64_encode and it's friend base64_decode allow you
to encode and decode binary data in a normal ASCII string.
http://php.net/file_get_contents
http://php.net/base64_encode
I want to encrypt the file with something akin to str_replace and
decode it on the other side with a custom data handler
Just want to make sure that I am str_replace'ing the actual data and
not a representation of it :)
str_replace is not for encryption. You might want to look at mcrypt,
as using str_replace is probably just as bad as sending the
unencrypted string. It's not going to be secure.
http://php.net/mcrypt
--
Jasper Bryant-Greene
Freelance web developer
http://jasper.bryant-greene.name/
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