Using the PHP Function Hash_Hkdf

Hash_hkdf is a PHP function that allows the developer to create hashes with the help of HMAC. It takes a string value and uses the message-digest algorithm to generate the hash value. The hash_hkdf() function can be utilized in various security scenarios and is especially useful for encryption of passwords and salts/hashes, user login information, database credentials, etc.

The function can be used with a wide range of hashing algorithms to provide different security levels. The hash_alogs() function can be used to view a list of available algorithms.

Using Functions

PHP functions allow you to separate your programming logic and code into smaller chunks that can be easily understood. They are a powerful way to create modular applications and save a lot of code as you do not have to write everything from scratch. In addition, you can easily re-use the same functions multiple times across your application.

Functions in PHP are a great way to reduce complexity and make your code more modular. They can also be a great way to ensure your code is well-formed and readable.

Depending on your project, you may need to use many different functions in order to accomplish a specific task. Fortunately, there are a number of different PHP functions that can be used to perform common tasks in your application.

When writing PHP code, it is essential to know the syntax and semantics of the language in order to understand how it works. For example, PHP functions must be declared using open and closed parenthesis and must always start with a letter or underscore. In addition, PHP supports argument passing through the use of function arguments. Arguments are used to transfer information to a function and can be specified after the function name, inside the parentheses, with a comma separating each one.

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hash_hkdf example

throw EncryptionException::forNoDriverRequested();
        }

        if (! in_array($this->driver, $this->drivers, true)) {
            throw EncryptionException::forUnKnownHandler($this->driver);
        }

        if (empty($this->key)) {
            throw EncryptionException::forNeedsStarterKey();
        }

        $this->hmacKey = bin2hex(\hash_hkdf($this->digest, $this->key));

        $handlerName     = 'CodeIgniter\\Encryption\\Handlers\\' . $this->driver . 'Handler';
        $this->encrypter = new $handlerName($config);

        return $this->encrypter;
    }

    /** * Create a random key * * @param int $length Output length * * @return string */

        // Allow key override         if ($params) {
            $this->key = is_array($params) && isset($params['key']) ? $params['key'] : $params;
        }

        if (empty($this->key)) {
            throw EncryptionException::forNeedsStarterKey();
        }

        // derive a secret key         $encryptKey = \hash_hkdf($this->digest, $this->key, 0, $this->encryptKeyInfo);

        // basic encryption         $iv = ($ivSize = \openssl_cipher_iv_length($this->cipher)) ? \openssl_random_pseudo_bytes($ivSize) : null;

        $data = \openssl_encrypt($data, $this->cipher, $encryptKey, OPENSSL_RAW_DATA, $iv);

        if ($data === false) {
            throw EncryptionException::forEncryptionFailed();
        }

        $result = $this->rawData ? $iv . $data : base64_encode($iv . $data);

        
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