How to Encrypted a File and attachment send out in php?

Question

Do anyone know how can I encrypted a file and attachment send out in php?

Example: If I have a csv file call test.csv. Any way that I can encrypted the file then attached and send it over to someone. Also, how can I decrypt the file from the other side?

Answer 1

get the file into $file_str:

$file_string = file_get_contents("text.csv");

encrypt via mcrypt

$key = "mykey";
$data = mcrypt_encrypt(MCRYPT_RIJNDAEL_256,$key,$file_string,MCRYPT_MODE_CBC,$key);

decrypt in client's end

$file_string = mcrypt_decrypt(MCRYPT_RIJNDAEL_256,$key,$data,MCRYPT_MODE_CBC,$key);

create the file again

file_put_contents("text.csv",$file_string);