Zend_Crypt_Math Class Reference

Inheritance diagram for Zend_Crypt_Math:

Public Member Functions
	rand ($minimum, $maximum)
	btwoc ($long)
	fromBinary ($binary)
	toBinary ($integer)
Public Member Functions inherited from Zend_Crypt_Math_BigInteger
	__construct ($extension=null)
	__call ($methodName, $args)

Static Public Member Functions
static	randBytes ($length, $strong=false)
static	randInteger ($min, $max, $strong=false)

Additional Inherited Members
Protected Member Functions inherited from Zend_Crypt_Math_BigInteger
	_loadAdapter ($extension=null)
Protected Attributes inherited from Zend_Crypt_Math_BigInteger
	$_math = null

Detailed Description

Definition at line 34 of file Math.php.

Member Function Documentation

btwoc()

btwoc

(

$long

)

Get the big endian two's complement of a given big integer in binary notation

Parameters

string

$long

Returns

string

Definition at line 161 of file Math.php.

    {
        if (ord($long[0]) > 127) {
            return "\x00" . $long;
        }
        return $long;
    }

fromBinary()

fromBinary

(

$binary

)

Translate a binary form into a big integer string

Parameters

string

$binary

Returns

string

Definition at line 175 of file Math.php.

    {
        return $this->_math->binaryToInteger($binary);
    }

rand()

rand	(		$minimum,
			$maximum
	)

Generate a pseudorandom number within the given range. Will attempt to read from a systems RNG if it exists or else utilises a simple random character to maximum length process. Simplicity is a factor better left for development...

Parameters

string | int	$minimum
string | int	$maximum

Returns

string

Definition at line 47 of file Math.php.

    {
        if (file_exists('/dev/urandom')) {
            $frandom = fopen('/dev/urandom', 'r');
            if ($frandom !== false) {
                return fread($frandom, strlen($maximum) - 1);
            }
        }
        if (strlen($maximum) < 4) {
            return mt_rand($minimum, $maximum - 1);
        }
        $rand = '';
        $i2 = strlen($maximum) - 1;
        for ($i = 1; $i < $i2; $i++) {
            $rand .= mt_rand(0, 9);
        }
        $rand .= mt_rand(0, 9);
        return $rand;
    }

randBytes()

static randBytes (   $length,   $strong = false  )

static

Return a random strings of $length bytes

Parameters

integer	$length
boolean	$strong

Returns

string

Definition at line 74 of file Math.php.

    {
        $length = (int) $length;
        if ($length <= 0) {
            return false;
        }
        if (function_exists('random_bytes')) { // available in PHP 7
            return random_bytes($length);
        }
        if (function_exists('mcrypt_create_iv')) {
            $bytes = mcrypt_create_iv($length, MCRYPT_DEV_URANDOM);
            if ($bytes !== false && strlen($bytes) === $length) {
                return $bytes;
            }
        }
        if (file_exists('/dev/urandom') && is_readable('/dev/urandom')) {
            $frandom = fopen('/dev/urandom', 'r');
            if ($frandom !== false) {
                return fread($frandom, $length);
            }
        }
        if (true === $strong) {
            require_once 'Zend/Crypt/Exception.php';
            throw new Zend_Crypt_Exception(
                'This PHP environment doesn\'t support secure random number generation. ' .
                'Please consider installing the OpenSSL and/or Mcrypt extensions'
            );
        }
        $rand = '';
        for ($i = 0; $i < $length; $i++) {
            $rand .= chr(mt_rand(0, 255));
        }
        return $rand;
    }

randInteger()

static randInteger (   $min,   $max,   $strong = false  )

static

Return a random integer between $min and $max

Parameters

integer	$min
integer	$max
boolean	$strong

Returns

integer

Definition at line 117 of file Math.php.

    {
        if ($min > $max) {
            require_once 'Zend/Crypt/Exception.php';
            throw new Zend_Crypt_Exception(
                'The min parameter must be lower than max parameter'
            );
        }
        $range = $max - $min;
        if ($range == 0) {
            return $max;
        } elseif ($range > PHP_INT_MAX || is_float($range)) {
            require_once 'Zend/Crypt/Exception.php';
            throw new Zend_Crypt_Exception(
                'The supplied range is too great to generate'
            );
        }
        if (function_exists('random_int')) { // available in PHP 7
            return random_int($min, $max);
        }
        // calculate number of bits required to store range on this machine
        $r = $range;
        $bits = 0;
        while ($r) {
            $bits++;
            $r >>= 1;
        }
        $bits   = (int) max($bits, 1);
        $bytes  = (int) max(ceil($bits / 8), 1);
        $filter = (int) ((1 << $bits) - 1);
        do {
            $rnd  = hexdec(bin2hex(self::randBytes($bytes, $strong)));
            $rnd &= $filter;
        } while ($rnd > $range);
        return ($min + $rnd);
    }

toBinary()

toBinary

(

$integer

)

Translate a big integer string into a binary form

Parameters

string

$integer

Returns

string

Definition at line 186 of file Math.php.

    {
        return $this->_math->integerToBinary($integer);
    }

---

The documentation for this class was generated from the following file:

• vendor/magento/zendframework1/library/Zend/Crypt/Math.php