Home Backend Development PHP Tutorial Detailed explanation of the function of password_hash in PHP

Detailed explanation of the function of password_hash in PHP

Jun 09, 2020 am 10:19 AM
password_hash

Detailed explanation of the function of password_hash in PHP

password_hash

传统的用户名和密码都采用加盐的方式存储加密信息,盐值也需要存储。

自PHP5.5.0之后,新增加了密码散列算法函数(password_hash),password_hash() 使用足够强度的单向散列算法创建密码的散列(hash)。 password_hash() 兼容 crypt()。 所以, crypt() 创建的密码散列也可用于 password_hash()。

说明

password_hash不需要再单独存储盐值,而且每次加密的值都不一样,我们只需要存储加密字符串,验证时用password_verify()方法即可得出结果!

当前支持的算法:

PASSWORD_DEFAULT - 使用 bcrypt 算法 (PHP 5.5.0 默认)。 注意,该常量会随着 PHP 加入更新更高强度的算法而改变。 所以,使用此常量生成结果的长度将在未来有变化。 因此,数据库里储存结果的列可超过60个字符(最好是255个字符)。

PASSWORD_BCRYPT - 使用 CRYPT_BLOWFISH 算法创建散列。 这会产生兼容使用 "$2y$" 的 crypt()。 结果将会是 60 个字符的字符串, 或者在失败时返回 FALSE。

PASSWORD_ARGON2I - 使用 Argon2 散列算法创建散列。

返回值:

返回散列后的密码, 或者在失败时返回 FALSE。

使用的算法、cost 和盐值作为散列的一部分返回。所以验证散列值的所有信息都已经包含在内。 这使 password_verify() 函数验证的时候,不需要额外储存盐值或者算法的信息。

/**
 * 我们想要使用默认算法散列密码
 * 当前是 BCRYPT,并会产生 60 个字符的结果。
 *
 * 请注意,随时间推移,默认算法可能会有变化,
 * 所以需要储存的空间能够超过 60 字(255字不错)
 */
 
 
password_hash("rasmuslerdorf", PASSWORD_DEFAULT);
 
输出类似结果:
$2y$10$.vGA1O9wmRjrwAVXD98HNOgsNpDczlqm3Jq7KnEd1rVAGv3Fykk1a
Copy after login

验证

$inputValue = '123456'; //用户输入的密码
if(password_verify( $inputValue, '数据库存储的密码')){
    //如果为真,则验证成功
}
 
输出:
True  或 False
Copy after login

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