Hash.php

<?php
 
class Hash {

    /**
     * Hash a password using the Bcrypt hashing scheme.
     *
     * <code>
     *    	// Create a Bcrypt hash of a value
     *		$hash = Hash::make('secret');
     *
     *		// Use a specified number of iterations when creating the hash
     *		$hash = Hash::make('secret', 12);
     * </code>
     *
     * @param  string  $value
     * @param  int     $rounds
     * @return string
     */
    public static function make($value, $rounds = 8)
    {
        $work = str_pad($rounds, 2, '0', STR_PAD_LEFT);

        // Bcrypt expects the salt to be 22 base64 encoded characters including
        // dots and slashes. We will get rid of the plus signs included in the
        // base64 data and replace them with dots.
        if (function_exists('openssl_random_pseudo_bytes'))
        {
            $salt = openssl_random_pseudo_bytes(16);
        }
        else
        {
            $salt = static::random(40);
        }

        $salt = substr(strtr(base64_encode($salt), '+', '.'), 0 , 22);

        return crypt($value, '$2a$'.$work.'$'.$salt);
    }

    /**
     * Determine if an unhashed value matches a Bcrypt hash.
     *
     * @param  string  $value
     * @param  string  $hash
     * @return bool
     */
    public static function check($value, $hash)
    {
        return crypt($value, $hash) === $hash;
    }

    /**
     * Generate a random alpha or alpha-numeric string.
     *
     * <code>
     *		// Generate a 40 character random alpha-numeric string
     *		echo Str::random(40);
     * <code>
     *
     * @param  int	   $length
     * @return string
     */
    public static function random($length)
    {
        $pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';

        return substr(str_shuffle(str_repeat($pool, 5)), 0, $length);
    }

}