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2006-02-05, 22:37
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<?php
function encrypt_hash_crc($txt,$key,$hash_func = 'md5',$crc_func = 'crc32')
{
$crc = intval( $crc_func($txt.$key) );
$hash = $hash_func($crc.$key);
//Éú³ÉÖмä½á¹ûtemp
$tmp = stringxor($txt,$hash);
//Ìí¼Ó$crcµ½Í·²¿
$result = int2string($crc).$tmp;
return $result;
}
function decrypt_hash_crc($txt,$key,$hash_func = 'md5',$crc_func = 'crc32')
{
$tmp = $txt ;
//È»ºóÌáÈ¡crc£¬Ç°4¸ö×Ö½ÚÊÇCRC
$crc = string2int(substr($tmp,0,4));
$hash = $hash_func($crc.$key);
//ÌáÈ¡txt
$txt = substr($tmp,4);
//×îºó½âÃÜ
$tmp = stringxor($txt,$hash);
return $tmp;
}
?>
cnbragon
2006-02-06, 02:05
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CRC32(PlainText+Key)=str_crc
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panic
2006-02-06, 09:16
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