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PHP Manual


hash_pbkdf2

(PHP 5 >= 5.5.0)

hash_pbkdf2Generate a PBKDF2 key derivation of a supplied password

Description

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

Parameters

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.

iterations

The number of internal iterations to perform for the derivation.

length

The length of the derived key to output. If "0", the length of the supplied algorithm is used.

raw_output

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

Return Values

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.

Errors/Exceptions

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).

Changelog

Version Description
5.5.0 Function added

Examples

Example #1 hash_pbkdf2() example, basic usage

<?php
   $password 
"password";
   
$salt "salt";
   
$hash hash_pbkdf2("sha256"$password$salt120);
   echo 
$hash;
   
?>

The above example will output:

   120fb6cffcf8b32c43e7
   

Notes

Caution

The PBKDF2 method can be used for hashing passwords for storage (It is NIST approved for that use). However, it should be noted that CRYPT_BLOWFISH is better suited for password storage and should be used instead.

See Also

  • crypt() - One-way string hashing
  • 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




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