hash_pbkdf2
Description
The hash_pbkdf2 of Hash for PHP 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
algo
Name of selected hashing algorithm.
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 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.
binary
When 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; ?>
83806c25a5fcf85ea803228d31f35dda9feae0b6f4319817252e7336913450c54215839dc38cb96db888b2f1a99b6c3e
2 · length
<? $algo = 'sha384'; $password = 'password'; $salt = random_bytes(16); $iterations = 1000; $length = 32; $return = hash_pbkdf2($algo, $password, $salt, $iterations, $length); echo $return; ?>
d05e69d78157cef44c651d4a2ccf8134
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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5b282f6f9bb8ad3ff3371d20428e82e348e0a16e7b4dff07b58a5d78ccce44a0
