sodium_crypto_pwhash_str
(PHP 7 >= 7.2.0)
sodium_crypto_pwhash_str — Get an ASCII-encoded hash
说明
$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_MODERATEandSODIUM_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, andSODIUM_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
opslimitandmemlimitparameters 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
参见
- sodium_crypto_pwhash_str_verify() - Verifies that a password matches a hash
- sodium_crypto_pwhash() - Derive a key from a password
- password_hash() - 创建密码的散列（hash）
- password_verify() - 验证密码是否和散列值匹配
- » Libsodium Argon2 docs
