Generate a PBKDF2 key derivation of a supplied password
Syntax
hash_pbkdf2(
string $algo,
string $password,
string $salt,
int $iterations,
int $length = 0,
bool $binary = false
): stringParameters
algoName of selected hashing algorithm.
passwordThe password to use for the derivation.
saltThe salt to use for the derivation. This value should be generated randomly.
iterationsThe number of internal iterations to perform for the derivation.
lengthThe length of the output string. If binary is true this corresponds to the byte-length of the derived key, if binary 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.
binaryWhen set to true, outputs raw binary data. false outputs lowercase hexits.
Return
Returns a string containing the derived key as lowercase hexits unless binary is set to true in which case the raw binary representation of the derived key is returned.
Examples
1 · algo password salt iterations
<? $algo = 'sha384'; $password = 'password'; $salt = random_bytes(16); $iterations = 1000; $return = hash_pbkdf2($algo, $password, $salt, $iterations); echo $return; ?>
183fedcd29fe7f74e4402183c673506ae02ed1cdf57a5c1403213d910a3e0cfabf921738436787c143e1a1341968e90f
2 · length
<? $algo = 'sha384'; $password = 'password'; $salt = random_bytes(16); $iterations = 1000; $length = 32; $return = hash_pbkdf2($algo, $password, $salt, $iterations, $length); echo $return; ?>
a471b3c89f96e73090c812ed7d7fd0cb
3 · binary
<? $algo = 'sha384'; $password = 'password'; $salt = random_bytes(16); $iterations = 1000; $length = 32; $binary = true; $return = hash_pbkdf2($algo, $password, $salt, $iterations, $length, $binary); echo $return . PHP_EOL . bin2hex($return); ?>
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ea3354882770148cd53ac2112fe45089283c6ab574736290384c7b0c2c1b5e61
