Generate Valid Aes 256 Encryption Key
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AES-256 requires a 256-bit key, period. However there are different ways of building that 256-bit key. One way is to generate 256 random bits and take them as the key. You need to store these 256 bits somewhere, or you won't be able to decrypt what you've encrypted. Item #1 isn't going to help you at all. If I'm given a ciphertext and a key but don't know the underlying encryption scheme used, I guarantee you that AES-256-CBC will be on my top 5 list of choices: AES is the most common encryption scheme used, the 256 bit version is its 2nd most popular variant, and CBC mode is the most common mode of operation.

Introduction

Laravel's encrypter uses OpenSSL to provide AES-256 and AES-128 encryption. You are strongly encouraged to use Laravel's built-in encryption facilities and not attempt to roll your own 'home grown' encryption algorithms. All of Laravel's encrypted values are signed using a message authentication code (MAC) so that their underlying value can not be modified once encrypted.

Configuration

Before using Laravel's encrypter, you must set a key option in your config/app.php configuration file. You should use the php artisan key:generate command to generate this key since this Artisan command will use PHP's secure random bytes generator to build your key. If this value is not properly set, all values encrypted by Laravel will be insecure.

Using The Encrypter

C# Aes 256 Encryption

Encrypting A Value

You may encrypt a value using the encrypt helper. All encrypted values are encrypted using OpenSSL and the AES-256-CBC cipher. Furthermore, all encrypted values are signed with a message authentication code (MAC) to detect any modifications to the encrypted string:

Generate Valid Aes 256 Encryption Key Password

Encrypting Without Serialization

Encrypted values are passed through serialize during encryption, which allows for encryption of objects and arrays. Thus, non-PHP clients receiving encrypted values will need to unserialize the data. If you would like to encrypt and decrypt values without serialization, you may use the encryptString and decryptString methods of the Crypt facade:

Generate valid aes 256 encryption keys

Decrypting A Value

Aes 256 Encryption Java

You may decrypt values using the decrypt helper. If the value can not be properly decrypted, such as when the MAC is invalid, an IlluminateContractsEncryptionDecryptException will be thrown: