I have question if you want:
- Why password hash bcrypt in laravel is random unlike sha1?
I test password 12345678in bcrypt and the result are different or with sha1 the same result.
So, how the system recognize password bcrypt in login app?
Thank you
That's just how bcrypt() and Hash::make work. Every time you run the method, you get a different string.
To check if password is correct, Laravel uses Hash::check() method:
Hash::check($passord, $hashedPassword)
Verifying A Password Against A Hash
The check method allows you to verify that a given plain-text string corresponds to a given hash.
Under the hood this method uses password_verify PHP function.
https://laravel.com/docs/5.5/hashing#basic-usage
Related
we know we can get a password as request and then check it with hash which determines whether user is authenticated or not. for example my password from request data is "12345678";
$user = User::select('password')->where('email', $request->email)->first();
Hash::check($request->password, $user->password);
it gives us a boolean result; but what if the password from request data is already hashed...for example "$2y$10$7slzuQpl8IKB.SOccwF8h.jQnykRyPyX66PtYgzIiYoq2u1AAUl2W"
in this case is there any process by which i can check user validity.?
If it's already hashed, what about:
if($user->password === $request->password)
Give you back a boolean
By default, Laravel currently uses bcrypt algorithm for hashing.
In PHP a random salt is provided to anything you hash. Meaning if you were to have the same thing multiple times, it can give different results. This is to prevent security risks, such as Rainbow table attacks, where someone can lookup your hashed value, and find the original value.
Therefore it is NOT possible to do something like this:
$user = User::where('password', $hashedPassword)->first();
See:
https://www.php.net/manual/en/function.password-hash.php
There is no option to convert hashed text back to plain text. Thats the reason why we use that method to store password - only the author of a password can know the real value - nobody else (developers and someone who can stole passwords). The popular method used to break hashed password is called "brute force attack" and is based on comparing already known hashed values of popular passwords to existing ones in database.
Now i need to show current password when user change password. but hash password cant not return back.
how to solve this issue?
convert hashed password to normal password?
Encryption is a two-way function; what is encrypted can be decrypted with the proper key.
Hashing is a one-way function that scrambles plain text to produce a unique message digest. With a properly designed algorithm, there is no way to reverse the hashing process to reveal the original password.
Now i need to show current password when user change password. but hash password cant not return back. how to solve this issue?
You do not need to show the password to anyone, including the owner of the password.
If you want to check, you can use check method, allows you to verify that a given plain-text string corresponds to a given hash.
if (Hash::check('plain-text', $hashedPassword)) {
// The passwords match...
}
I have some different requirement, i don't want to decode the password, but i am building some other app based on SAME DATABASE for LOGIN so what i can do to "encrypt the password value so that it matches the backend password encrypted code".
I want to provide LOGIN from CODEIGNITOR app where data base is created by admin app in LARAVEL ... this is the issue...
So through CodeIgnitor if someone is LOGIN the password will be encrypted equivalent hash encrypted laravel application code.
The Encrypted Password is
$2y$10$cwd15HRgON0ytqkkV5F9zupfUOkqaii7fpbB9Kjd9I7W46LRYY0Km
And the real PASSWOORD is
123456
Please help...
Caddy DZ's answer is right, but to better answer your question you should know that every time you generate a new password with bcrypt function, a new random salt is used.
This leads you to end up getting a different hash for the same password each time you generate one.
The only way you have to verify the correctness of the password, is to use a built-in php function called password_verify.
That function will hash your password (that you provide as a second argument) with the same salt that has been used to generate the stored password (the salt to use is stored in the password hash) you already have in the database:
$password = '123456';
$saved = 'your stored hash';
if (password_verify($password, $saved)) {
echo 'Correct password.';
}
You can check the documentation about password_verify
This is not standard encryption that can be decrypted, this is hashing which is only one (1) way encryption..
To make this work in, you need to use the same hashing algorithm between the two apps (Laravel and CodeIgniter)
For instance laravel uses bcrypt by default to hash the password, so you need to configure CodeIgniter to use the same or vice versa.
bcrypt for codeigniter
I have a slight problem after upgrading to laravel 5.4
When i do a password reset, the email gets generated and sent perfectly, however the token it saves to the user record in the database is as follows:
$2y$10$N0WFuqEkEIFto.CazxYLdOUmY1X9tBHfvDn8iWKUdlq2W9uOc00Ku
But the token it sends to the user to do a password reset is:
bc1c82830bc8ad1356aa5e2a2a5a342ae6c6fabd385add503795cca1a1993e15
My question is why are the two tokens different. and how do i perform a check now to validate if the token exists in the database as i need to get the email address to post to the reset controller.
Thanx in advance.
Token you store in database is hashed same as your password column in users table.
However the token you recieve is not hashed. Thats why they are different
Due to get this password ;
$2y$10$N0WFuqEkEIFto.CazxYLdOUmY1X9tBHfvDn8iWKUdlq2W9uOc00Ku
you have to do
Hash::make('bc1c82830bc8ad1356aa5e2a2a5a342ae6c6fabd385add503795cca1a1993e15');
And you cannot revert this process backwards.
The token in the database is encrypted with Bcrypt. That's why it is different in the database.
The token will still work when you use it.
The token it stores in the database is the same string, but hashed with bcrypt, a secure and adaptive algorithm based on the Blowfish cipher.
You can see the documentation for the vanilla PHP password_hash() function to see how it's built, and the password_verify() function to verify that the hashed string is valid against an unhashed version of it (what is sent to the user, in this case).
Laravel Hashing
Laravel includes its own hashing objects and facades which are documented.
To create a hash:
$string = 'Hello world.';
$hash = Hash::make($string);
To verify the hash against a plain string:
if (Hash::check($string, $hash)) {
// The passwords match...
}
Note: In Laravel 5.4, the email token changed from SHA256 to bcrypt in an undocumented change (as issue #18570 shows), so bear that in mind if you are upgrading from Laravel 5.3 or lower.
I am working on a website's framework translation. I have translate it from Yii php framework to Laravel. I have got an existing database and I have to provide login access to existing users to the new website. The problem is now I am using Laravel and Laravel does not recognizes the hashed values of the previous framework. i.e the values that are stored in the database hashed by some method in Yii framework. Is there any way to resolve this. I am using Auth::attempt() method in Laravel.
You can't... plain and simple...
hashing isn't encryption. hashing is one way, you can prove this to yourself by taking an md5 or shasum of a large file, since the file's size is larger than the hashes output, by pigeonhole principle hashes can't be restored...
you could try to rainbow table them with password lists, don't, because this is compromising users security.
you will probably have to figure out a way to mash Yii's auth module into Laravel, or use some sort of middle man auth bit... or just make everyone change passwords.
The Yii framework generates password hashes through the crypt function, and according to the documentation it generates BCrypt hashes. You can check this easily by looking at the hashes, BCrypt hashes start with $2y.
So Laravel should actually be able to check password with your hashes, if you cannot find a method which is integrated in Laravel itself, you can surely use the password_verify() function to check the hashes.