(PHP 4 >= 4.0.4, PHP 5)mhash_keygen_s2k -- Generates a key

Description

string mhash_keygen_s2k (int hash, string password, string salt, int bytes)

mhash_keygen_s2k() generates a key that is

bytes long, from a user given password.

This is the Salted S2K algorithm as specified in the OpenPGP

document (RFC 2440). That algorithm will use the specified

hash algorithm to create the key.

The salt must be different and random

enough for every key you generate in order to create different keys.

That salt must be known when you check the keys, thus it is

a good idea to append the key to it. Salt has a fixed length

of 8 bytes and will be padded with zeros if you supply less bytes.

Keep in mind that user supplied passwords are not really suitable

to be used as keys in cryptographic algorithms, since users normally

choose keys they can write on keyboard. These passwords use

only 6 to 7 bits per character (or less). It is highly recommended

to use some kind of transformation (like this function) to the user

supplied key.

Пред.

Начало

След.

mhash_get_hash_name

Уровень выше

mhash