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(PHP 5 >= 5.5.0)

hash_pbkdf2Generate a PBKDF2 key derivation of a supplied password


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



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


The password to use for the derivation.


The salt to use for the derivation.


The number of internal iterations to perform for the derivation.


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


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.


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).


Version Description
5.5.0 Function added


Example #1 hash_pbkdf2() example, basic usage

$salt "salt";
$hash hash_pbkdf2("sha256"$password$salt120);

The above example will output:




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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