Cập nhật ngày 27/12/2021 Show Nội dung chính
Trong PHP, muốn sử dụng mã hoá Bcrypt ta sẽ dùng hàm password_hash(). Hàm này thường dùng để mã hoá mật khẩu. Ngoài mã hoá Bcrypt hàm này còn hỗ trợ mã hoá Argon2i và Argon2id. password_hash ( string $password , int $algo [, array $options ] ) : string Trong đó:
Kết quả: Trả về chuỗi mã hoá hoặc FALSE nếu thất bại. Ví dụ: <?php $options = [ 'cost' => 12, ]; echo password_hash("rasmuslerdorf", PASSWORD_BCRYPT, $options); So sánh 2 chuỗi đã mã hoá?Đồi khi ta buồn ta chả biết làm gì rồi ngồi vu vơ nghĩ về Bcrypt, khi mà cùng 1 chuỗi nó mã hoá ra nhiều chuỗi mới khác nhau thì làm sao so sánh? Nhưng không sao, PHP đã cung cấp cho ta 1 hàm giúp làm việc này đó là password_verify(). password_verify ( string $password , string $hash ) : bool Trong đó:
Kết quả: TRUE nếu khớp, FALSE nếu không khớp. Ví dụ: <?php $hash = '$2y$07$BCryptRequires22Chrcte/VlQH0piJtjXl.0t1XkA8pw9dMXTpOq'; if (password_verify('rasmuslerdorf', $hash)) { echo 'Password is valid!'; } else { echo 'Invalid password.'; } Cập nhật ngày 27/12/2021 Nội dung chính
Trong PHP, muốn sử dụng mã hoá Bcrypt ta sẽ dùng hàm password_hash(). Hàm này thường dùng để mã hoá mật khẩu. Ngoài mã hoá Bcrypt hàm này còn hỗ trợ mã hoá Argon2i và Argon2id. password_hash ( string $password , int $algo [, array $options ] ) : string Trong đó:
Kết quả: Trả về chuỗi mã hoá hoặc FALSE nếu thất bại. Ví dụ: <?php $options = [ 'cost' => 12, ]; echo password_hash("rasmuslerdorf", PASSWORD_BCRYPT, $options); So sánh 2 chuỗi đã mã hoá?Đồi khi ta buồn ta chả biết làm gì rồi ngồi vu vơ nghĩ về Bcrypt, khi mà cùng 1 chuỗi nó mã hoá ra nhiều chuỗi mới khác nhau thì làm sao so sánh? Nhưng không sao, PHP đã cung cấp cho ta 1 hàm giúp làm việc này đó là password_verify(). password_verify ( string $password , string $hash ) : bool Trong đó:
Kết quả: TRUE nếu khớp, FALSE nếu không khớp. Ví dụ: <?php $hash = '$2y$07$BCryptRequires22Chrcte/VlQH0piJtjXl.0t1XkA8pw9dMXTpOq'; if (password_verify('rasmuslerdorf', $hash)) { echo 'Password is valid!'; } else { echo 'Invalid password.'; } So, you want to use bcrypt? Awesome! However, like other areas of cryptography, you shouldn't be doing it yourself. If you need to worry about anything like managing keys, or storing salts or generating random numbers, you're doing it wrong. The reason is simple: it's so trivially easy to screw up bcrypt. In fact, if you look at almost every piece of code on this page, you'll notice that it's violating at least one of these common problems. Face It, Cryptography is hard.Leave it for the experts. Leave it for people whose job it is to maintain these libraries. If you need to make a decision, you're doing it wrong. Instead, just use a library. Several exist depending on your requirements. LibrariesHere is a breakdown of some of the more common APIs. PHP 5.5 API - (Available for 5.3.7+)Starting in PHP 5.5, a new API for hashing passwords is being introduced. There is also a shim compatibility library maintained (by me) for 5.3.7+. This has the benefit of being a peer-reviewed and simple to use implementation.
Really, it's aimed to be extremely simple. Resources:
Zend\Crypt\Password\Bcrypt (5.3.2+)This is another API that's similar to the PHP 5.5 one, and does a similar purpose.
Resources:
PasswordLibThis is a slightly different approach to password hashing. Rather than simply supporting bcrypt, PasswordLib supports a large number of hashing algorithms. It's mainly useful in contexts where you need to support compatibility with legacy and disparate systems that may be outside of your control. It supports a large number of hashing algorithms. And is supported 5.3.2+
References:
PHPASSThis is a layer that does support bcrypt, but also supports a fairly strong algorithm that's useful if you do not have access to PHP >= 5.3.2... It actually supports PHP 3.0+ (although not with bcrypt).
Resources
Note: Don't use the PHPASS alternatives that are not hosted on openwall, they are different projects!!! About BCryptIf you notice, every one of these libraries returns a single string. That's because of how BCrypt works internally. And there are a TON of answers about that. Here are a selection that I've written, that I won't copy/paste here, but link to:
Wrap UpThere are many different choices. Which you choose is up to you. However, I would HIGHLY recommend that you use one of the above libraries for handling this for you. Again, if you're using Just use a library... |