Bulgaria PHP Conference 2019

sodium_crypto_pwhash_str

(PHP 7 >= 7.2.0)

sodium_crypto_pwhash_strGet an ASCII-encoded hash

说明

sodium_crypto_pwhash_str ( string $password , int $opslimit , int $memlimit ) : string

Uses a CPU- and memory-hard hash algorithm along with a randomly-generated salt, and memory and CPU limits to generate an ASCII-encoded hash suitable for password storage.

参数

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.

返回值

Returns the hashed password, 或者在失败时返回 FALSE.

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.

注释

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.

范例

Example #1 password_hash() example

<?php
$password 
'password';
echo 
sodium_crypto_pwhash_str(
    
$password,
    
SODIUM_CRYPTO_PWHASH_OPSLIMIT_INTERACTIVE,
    
SODIUM_CRYPTO_PWHASH_MEMLIMIT_INTERACTIVE
);

以上例程的输出类似于:

$argon2id$v=19$m=65536,t=2,p=1$oWIfdaXwWwhVmovOBc2NAQ$EbsZ+JnZyyavkafS0hoc4HdaOB0ILWZESAZ7kVGa+Iw

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