openssl_pbkdf2

(PHP 5 >= 5.5.0, PHP 7)

openssl_pbkdf2生成一个 PKCS5 v2 PBKDF2 字符串

说明

string openssl_pbkdf2 ( string $password , string $salt , int $key_length , int $iterations [, string $digest_algorithm = "sha1" ] )

openssl_pbkdf2() 计算 PBKDF2 (Password-Based Key Derivation Function 2), 在PKCS5 v2中定义的一个密钥的推导函数.

参数

password

派生密钥所生成的密码。

salt

PBKDF2 推荐一个不少于64位(8字节)的密码盐值。

key_length

希望输出密钥的长度。

iterations

需要的迭代次数 » NIST 建议至少10,000次.

digest_algorithm

openssl_get_md_methods()中可选的散列或摘要算法.默认是 SHA-1.

返回值

成功,返回原始二进制字符串 或者在失败时返回 FALSE.

范例

Example #1 openssl_pbkdf2() 范例

<?php
$password 
'yOuR-pAs5w0rd-hERe';
$salt openssl_random_pseudo_bytes(12);
$keyLength 40;
$iterations 10000;
$generated_key openssl_pbkdf2($password$salt$keyLength$iterations'sha256');
echo 
bin2hex($generated_key)."\n";
echo 
base64_encode($generated_key)."\n";
?>

参见

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User Contributed Notes 1 note

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1
McGlockenshire
4 years ago
Despite the manual claiming that this is available in PHP 5.5 and above, this function wasn't made available in my local install.

I expect that having a prehistoric OpenSSL library version installed is the likely culprit.

If you're using PHP 5.5 and don't have this function available in your OpenSSL extension, look at the functionally equivalent hash_pbkdf2 function instead.
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