Generate a PBKDF2 key derivation of a supplied password


(PHP 5 >= 5.5.0)

hash_pbkdf2Generate a PBKDF2 key derivation of a supplied password

Описание

string hash_pbkdf2 ( string $algo , string $password , string $salt , int $iterations [, int $length = 0 [, bool $raw_output = false ]] )

Список параметров

algo

Name of selected hashing algorithm (i.e. md5, sha256, haval160,4, etc..) See hash_algos() for a list of supported algorithms.

password

The password to use for the derivation.

salt

The salt to use for the derivation. This value should be generated randomly.

iterations

The number of internal iterations to perform for the derivation.

length

The length of the output string. If raw_output is TRUE this corresponds to the byte-length of the derived key, if raw_output is FALSE this corresponds to twice the byte-length of the derived key (as every byte of the key is returned as two hexits).

If 0 is passed, the entire output of the supplied algorithm is used.

raw_output

When set to TRUE, outputs raw binary data. FALSE outputs lowercase hexits.

Возвращаемые значения

Returns a string containing the derived key as lowercase hexits unless raw_output is set to TRUE in which case the raw binary representation of the derived key is returned.

Ошибки

An E_WARNING will be raised if the algorithm is unknown, the iterations parameter is less than or equal to 0, the length is less than 0 or the salt is too long (greater than INT_MAX - 4).

Примеры

Пример #1 hash_pbkdf2() example, basic usage

<?php
$password 
"password";
$iterations 1000;

// Generate a random IV using mcrypt_create_iv(),
// openssl_random_pseudo_bytes() or another suitable source of randomness
$salt mcrypt_create_iv(16MCRYPT_DEV_URANDOM);

$hash hash_pbkdf2("sha256"$password$salt$iterations20);
echo 
$hash;
?>

Результатом выполнения данного примера будет что-то подобное:

 120fb6cffcf8b32c43e7 

Примечания

Предостережение

The PBKDF2 method can be used for hashing passwords for storage. However, it should be noted that password_hash() or crypt() with CRYPT_BLOWFISH are better suited for password storage.

Смотрите также

  • crypt() - Необратимое хэширование строки
  • password_hash() - Creates a password hash
  • hash() - Генерирует хеш-код (дайджест сообщения)
  • hash_algos() - Возвращает список зарегистрированных алгоритмов хеширования
  • hash_init() - Инициализация инкриментального контекста хеширования
  • hash_hmac() - Генерация хеш-кода на основе ключа, используя метод HMAC
  • hash_hmac_file() - Генерация хэш-кода на основе ключа, используя метод HMAC и содержимое полученного файла