php 한글 메뉴얼 도움말 검색 사이트 Generate a PBKDF2 key derivation of a supplied password [function.hash-pbkdf2]

설명

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

인수

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.

반환값

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.

오류/예외

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).

예제

Example #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(16, MCRYPT_DEV_URANDOM);

$hash = hash_pbkdf2("sha256", $password, $salt, $iterations, 20);
echo $hash;
?>

위 예제의 출력 예시:

120fb6cffcf8b32c43e7

주의

Caution

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.

참고

crypt() - 단방향 문자열 암호화(해시)
password_hash() - Creates a password hash
hash() - Generate a hash value (message digest)
hash_algos() - Return a list of registered hashing algorithms
hash_init() - Initialize an incremental hashing context
hash_hmac() - Generate a keyed hash value using the HMAC method
hash_hmac_file() - Generate a keyed hash value using the HMAC method and the contents of a given file