sodium_crypto_pwhash_str
Get an ASCII-encoded hash
Description
string sodium_crypto_pwhash_str(#[\SensitiveParameter]string $password
, int $opslimit
, int $memlimit
)
Parameters
-
password
-
string; The password to generate a hash for.
-
opslimit
-
Represents a maximum amount of computations to perform. Raising this number will make the function require more CPU cycles to compute a key. There are constants available to set the operations limit to appropriate values depending on intended use, in order of strength: SODIUM_CRYPTO_PWHASH_OPSLIMIT_INTERACTIVE
, SODIUM_CRYPTO_PWHASH_OPSLIMIT_MODERATE
and SODIUM_CRYPTO_PWHASH_OPSLIMIT_SENSITIVE
.
-
memlimit
-
The maximum amount of RAM that the function will use, in bytes. There are constants to help you choose an appropriate value, in order of size: SODIUM_CRYPTO_PWHASH_MEMLIMIT_INTERACTIVE
, SODIUM_CRYPTO_PWHASH_MEMLIMIT_MODERATE
, and SODIUM_CRYPTO_PWHASH_MEMLIMIT_SENSITIVE
. Typically these should be paired with the matching opslimit values.
Return Values
Returns the hashed password.
In order to produce the same password hash from the same password, the same values for opslimit
and memlimit
must be used. These are embedded within the generated hash, so
everything that's needed to verify the hash is included. This allows
the sodium_crypto_pwhash_str_verify function to verify the hash without
needing separate storage for the other parameters.
Examples
Example #1 sodium_crypto_pwhash_str example
<?php
$password = 'password';
echo sodium_crypto_pwhash_str(
$password,
SODIUM_CRYPTO_PWHASH_OPSLIMIT_INTERACTIVE,
SODIUM_CRYPTO_PWHASH_MEMLIMIT_INTERACTIVE
);
The above example will output
something similar to:
$argon2id$v=19$m=65536,t=2,p=1$oWIfdaXwWwhVmovOBc2NAQ$EbsZ+JnZyyavkafS0hoc4HdaOB0ILWZESAZ7kVGa+Iw
Notes
Note:
Hashes are calculated using the Argon2ID algorithm,
providing resistance to both GPU and side-channel attacks.
In contrast to the password_hash function,
there is no salt parameter (a salt is generated automatically),
and the opslimit
and
memlimit
parameters are not optional.