Проверка валидности пароля php

PHP password_verify

Summary: in this tutorial, you’ll learn to use the PHP password_verify() function to check if a password matches a hashed password.

Introduction to the PHP password_verify() function

When dealing with passwords, you should never store them in the database as plain text. And you should always hash the passwords using a secure one-way hash algorithm.

PHP provided the built-in password_hash() function that creates a hash from a plain text password. Note that the password_hash() function is a one-way hash function. It means that you cannot find its original value.

To verify if a plain text password matches a hashed password, you must hash the plain text password and compare the hashes.

However, you don’t have to do it manually since PHP provides you with the built-in password_verify() function that allows you to compare a password with a hash:

password_verify(string $password, string $hash): boolCode language: PHP (php)

The password_verify() has two parameters:

• $password is a plain text password to match.
• $hash is a hash created by the password_hash() function.

The password_verify() function returns true if the password matches the hash or false otherwise.

PHP password_verify() function example

The following example uses the password_verify() function to check if the password Password1 matches a hash:

 $hash = '$2y$10$hnQY9vdyZUcwzg2CO7ykf.a4iI5ij4Pi5ZwySwplFJM7AKUNUVssO'; $valid = password_verify('Password1', $hash); echo $valid ? 'Valid' : 'Not valid';Code language: PHP (php)

ValidCode language: PHP (php)

In practice, you’ll use the password_verify() function as following to verify a login:

• Find a user from the database by a username (or email)
• Use the password_verify() function to match the user’s provided password with a hashed password.
• If the password matches the hash, you log the user in. Otherwise, you’ll issue an error message.

The code will look like the following:

 // . $user = find_user_by_username($username); if ($user && password_verify($password, $user['password'])) < // log the user in session_regenerate_id(); $_SESSION['user_id'] = $user['id']; > else < echo 'Invalid username or password'; >Code language: PHP (php)

In the following tutorial, you’ll learn to use the password_verify() function in the login form.

Summary

• Use the PHP password_verify() function to check if a password matches a hashed password created by the password_hash() function.

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README.md

Класс для валидации паролей, написанный на PHP. Может проверять пароли по следующим параметрам:

• Минимальная длина
• Максимальная длина
• Содержит ли цифры
• Минимальное кол-во цифр
• Максимальное кол-во цифр
• Содержит ли буквы
• Минимальное кол-во букв
• Максимальное кол-во букв
• Есть ли буквы в нижнем регистре
• Есть ли буквы в верхнем регистре
• Содержит ли символы
• Разрешенные символы
• Отсутствие пробелов

При необходимости в момент создания экземпляра класса в него можно передать массив с параметрами, которые будут учитываться при валидации.

$pwd = new PasswordValidator([ 'lang' => 'en', 'minLength' => 5, 'maxLength' => INF, 'containNumbers' => false, 'minNumbers' => 0, 'maxNumbers' => INF, 'containLetters' => false, 'minLetters' => 0, 'maxLetters' => INF, 'lowerLetters' => false, 'upperLetters' => false, 'containSymbols' => false, 'availableSymbols' => '+-*$#@!%:?', 'availableSpaces' => false, ]);

После того, как все параметры заданы, останется только проверять пароли:

В случае, если все проверки прошли, метод вернет пустой массив. Если же при проверке обнаружены ошибки, то метод вернет описание ошибок на выбранном языке. На данный момент присуствует русская и английская локализация.

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How to validate password strength in PHP

Today, we’ll explain to you how to validate password strength in PHP. It is very useful to check that the password is strong which protects the user accounts and prevents hacking.

Using regular expressions, we will validate the password strength in PHP.

Check the following points to validate the password strength

• Password must be a minimum of 8 characters
• Password must contain at least 1 number
• Password must contain at least one uppercase character
• Password must contain at least one lowercase character
• Password must contain at least one special character

In the code below, we will use the PHP function preg_match() to check if the password matches the defined pattern.

if ( strlen ( $password ) < 8 | | ! $number | | ! $uppercase | | ! $lowercase | | ! $specialChars )

echo «Password must be at least 8 characters in length and must contain at least one number, one upper case letter, one lower case letter and one special character.» ;

Example

Let’s take an example to check the output. Use the above code with the HTML as below.

if ( strlen ( $password ) < 8 | | ! $number | | ! $uppercase | | ! $lowercase | | ! $specialChars )

$msg = «Password must be at least 8 characters in length and must contain at least one number, one upper case letter, one lower case letter and one special character.» ;

We can also check the password strength in a single pattern with regex.

echo «Password must be at least 8 characters in length and must contain at least one number, one upper case letter, one lower case letter and one special character.» ;

Output

Run the code and check the output in the browser.

That’s it for today.
Thank you for reading. Happy Coding.

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IMTIAZ EPU

Password Validation with PHP and Regular Expressions

Password Validation with PHP and Regular Expressions.

Regular-Expressions are equally complicated and elegant at the exact same time. They may be made to look like someone was only hammering randomly on their keyboard. They’re also a remarkably effective and elegant solution to describing the structure of the text and fitting those structures.

They’re very handy for defining what a string should look like and as such are very great to be used in password validation. It’s essential that the password needs to be validated With safe & strength for security. So Make it difficult for password crackers. Use long passwords with letters, CAPS, numbers, and symbols. Let’s check a password validation with PHP and regular expressions. That is a straightforward and long example for beginners.

$pwd = $_POST[‘password ‘]; if( strlen($password ) < 8 ) < $error .= "Password too short! "; >if( strlen($password ) > 20 ) < $error .= "Password too long! "; >if( strlen($password ) < 8 ) < $error .= "Password too short! "; >if( !preg_match(«#9+#», $password ) ) < $error .= "Password must include at least one number! "; >if( !preg_match(«#[a-z]+#», $password ) ) < $error .= "Password must include at least one letter! "; >if( !preg_match(«#[A-Z]+#», $password ) ) < $error .= "Password must include at least one CAPS! "; >if( !preg_match(«#W+#», $password ) ) < $error .= "Password must include at least one symbol! "; >if($error) < echo "Password validation failure(your choise is weak): $error"; >else

Short example with Regex

This is the short version of that password -check with regex(lookahead / lookbehind / lookaround) using PHP’s PCRE engine.

$password = $_POST[‘password ‘]; if (preg_match(«#.*^(?=.)(?=.*[a-z])(?=.*[A-Z])(?=.*5)(?=.*W).*$#», $password )) < echo "Your password is strong."; >else

You may use «d» instead of «[a-z]» and «W» instead of non-word characters, symbols. You can make a manual list of most used symbols like [#.-_,$%&!] .

Remember most consumers don’t enjoy passwords with symbols, you can exclude emblem checks for. Just check letters, duration, caps, and numbers.

$password= $_POST[‘password’]; if (preg_match(«#.*^(?=.)(?=.*[a-z])(?=.*[A-Z])(?=.*5).*$#», $password)) < echo "Your password is good."; >else

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PHP password_verify() Function

The password_verify() function is used to match the hash password with the original password. Another function, password_hash() is used to generate the hash value based on the hashing algorithm, cost, and salt value. The password_verify() function contains all hashing information to verify the hash with the password. The uses of this function have been shown in this tutorial by using multiple examples.

Syntax

This function has two arguments and it returns true on success and false on failure. The syntax of this function has given below.

The first argument contains the password that will be checked. The second argument contains the hash value that is used to check the password is valid or not. This hash value is generated by using the password_hash() function.

Different types of algorithms can be used to generate the hash value of any password. The second argument of the password_hash() function contains a constant value that indicates a hashing algorithm. The constants which can be used by the password_hash() function has mentioned below.

Constant Name	Description
PASSWORD_DEFAULT	It uses the default algorithm to generate the hash value of the password.
PASSWORD_BCRYPT	It uses the CRYPT_BLOWFISH algorithm to generate the hash value of the password.
PASSWORD_ARGON2I	It uses the Argon2i algorithm to generate the hash value of the password.
PASSWORD_ARGON2ID	It uses the Argon2id algorithm to generate the hash value of the password.

Uses of password_verify() Function

The ways to verify the password based on the hash value generated by different hashing algorithms has shown in this part of the tutorial.

Example-1: Verify Password with the Hash Generated by PASSWORD_DEFAULT

Create a PHP file with the following script that will display a form for the user to provide the password that will be checked by the password_verify() function for validation when the submit button will be pressed.

The constant value, PASSWORD_DEFAULT has been used in the password_hash() function to generate the hash value of the particular password. Next, the password_verify() function has used to check the password value given by the user is valid or invalid.

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