Hash 函数
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hash_pbkdf2

(PHP 5 >= 5.5.0)

hash_pbkdf2Generate a PBKDF2 key derivation of a supplied password

说明

string hash_pbkdf2 ( string $algo , string $password , string $salt , int $iterations [, int $length = 0 [, bool $raw_output = false ]] )

参数

algo

Name of selected hashing algorithm (i.e. md5, sha256, haval160,4, etc..) See hash_algos() for a list of supported algorithms.

password

The password to use for the derivation.

salt

The salt to use for the derivation.

iterations

The number of internal iterations to perform for the derivation.

length

The length of the derived key to output. If 0, the length of the supplied algorithm is used.

raw_output

When set to TRUE, outputs raw binary data. FALSE outputs lowercase hexits.

返回值

Returns a string containing the derived key as lowercase hexits unless raw_output is set to true in which case the raw binary representation of the derived key is returned.

错误/异常

An E_WARNING will be raised if the algorithm is unknown, the iterations parameter is less than or equal to 0, the length is less than 0 or the salt is too long (greater than INT_MAX - 4).

范例

Example #1 hash_pbkdf2() example, basic usage

<?php
$password 
"password";
$salt "salt";
$hash hash_pbkdf2("sha256"$password$salt120);
echo 
$hash;
?>

以上例程会输出:

120fb6cffcf8b32c43e7

注释

Caution

The PBKDF2 method can be used for hashing passwords for storage (it is NIST approved for that use). However, it should be noted that CRYPT_BLOWFISH is better suited for password storage and should be used instead via crypt().

参见


Hash 函数
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