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These 2 functions are used to perform encryptions. They are currently set up to perform triple des encrypting on information that will be stored in a file. The str_replace calls at the beginning of each function were put there after hours of debugging, i am sure the replacements could be done quicker... These functions with a little modification could be used to store encrypted information in a database... I prefer to use mcrypt over any other encryption, because of the security. _mencrypt ( string $input, string $key ) $input - stuff to encrypt $key - the secret key to use _mdecrypt ( string $input, string $key ) $input - stuff to decrypt $key - the secret key to use both function perform these: substr(md5($key),0,24) - this make sure the secret key is the max length, the longer the key the harder to break it. str_replace - a few characters , both function must be the same Usage: 1. For storing Credit Card Numbers in a database. 2. encrypting a user file based on their password, their password would be the key to decrypting. This also brings up a point that in this user file could be used to stored other keys for decrypting other sensitive data, such as credit card numbers. These functions are currently running in an application for a hospital. Any questions, or comments feel free to get in contact, i have received allot from others, its time i gave back. <? //$input - stuff to encrypt //$key - the secret key to use function _mencrypt($input,$key){ $input = str_replace("\n","",$input); $input = str_replace("\t","",$input); $input = str_replace("\r","",$input); $key = substr(md5($key),0,24); $td = mcrypt_module_open ('tripledes', '', 'ecb', ''); $iv = mcrypt_create_iv (mcrypt_enc_get_iv_size ($td), MCRYPT_RAND); mcrypt_generic_init ($td, $key, $iv); $encrypted_data = mcrypt_generic ($td, $input); mcrypt_generic_deinit ($td); mcrypt_module_close ($td); return trim(chop(base64_encode($encrypted_data))); } //$input - stuff to decrypt //$key - the secret key to use function _mdecrypt($input,$key){ $input = str_replace("\n","",$input); $input = str_replace("\t","",$input); $input = str_replace("\r","",$input); $input = trim(chop(base64_decode($input))); $td = mcrypt_module_open ('tripledes', '', 'ecb', ''); $key = substr(md5($key),0,24); $iv = mcrypt_create_iv (mcrypt_enc_get_iv_size ($td), MCRYPT_RAND); mcrypt_generic_init ($td, $key, $iv); $decrypted_data = mdecrypt_generic ($td, $input); mcrypt_generic_deinit ($td); mcrypt_module_close ($td); return trim(chop($decrypted_data)); } ?> | |||||
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