(PHP 5 >= 5.5.0)
hash_pbkdf2 — Generate a PBKDF2 key derivation of a supplied password
$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.
FALSEoutputs lowercase hexits.
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.
E_WARNING will be raised if the algorithm is
iterations parameter is less than or
equal to 0, the
length is less
than 0 or the
salt is too long
INT_MAX - 4).
Example #1 hash_pbkdf2() example, basic usage
$password = "password";
$salt = "salt";
$hash = hash_pbkdf2("sha256", $password, $salt, 1, 20);
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 via crypt().
- 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