An implementation of Steve Gibson's Perfect Paper Passwords (PPP) system.
Implements Steve Gibson's PPP One-Time-Pad System along with some additional helpers.
Requires OpenSSL and bcmaths PHP extension to be installed.
Version 3.1.0 changed from the, now deprecated, mcrypt library over to using OpenSSL internally.
$key = CryptoPPP::genKeys(); or
$key = CryptoPPP::genKeys(1);
If you want 2 keys you would do
$keys = CryptoPPP::genKeys(2); to get them in the $keys array or do
list($k1, $k2) = CryptoPPP::genKeys(2); to assign them to named variables.
Now that you have at least one key, you can use it as the basis of generating tokens or token streams.
The simplest way to convert a key into a token of a given length and using a given output alphabet is to call the
CryptoPPP::keyToToken static method. If no length or alphabet is defined a 12 character token using the default
!#%+23456789:=?@ABCDEFGHJKLMNPRSTUVWXYZabcdefghijkmnopqrstuvwxyz) will be created from the key.
To create tokens with a format such as 'X7gM-jA9v-KtWs' where the length of the 'blocks' and the 'glue' between them are
customisable you can use the related helper method
If your application can associate an incrementing sequence number with a key, then you can use the PPP system to
generate a One-Time-Pad (a stream of tokens.) This is simply done by passing the key, the sequence position, output
alphabet and token length to
CryptoPPP::getCode(). Once your application finishes using that token from the token stream, simply increment the sequence number ready for the next usage.