How to solve laravel error The MAC is invalid

This article mainly talks about the solution to the error The MAC is invalid reported by Laravel. It has certain reference value and interested friends can learn about it.

When using the laravel framework for website development, we will use laravel's Crypt class to encrypt the user's password to achieve the purpose of information encryption. The Crypt class will rely on APP_KEY when encrypting data, so when replacing APP_KEY, and then use the Crypt::decrypt() function during login verification, the error The MAC is invalid. will be reported.

So the solution is to decrypt the original APP_KEY to obtain the user's original data, and then re-encrypt the user data according to the new APP_KEY and store it in the database.

The manual instructions are as follows:
Settings:
Before using Laravel's encryption function, you need to set a value for the APP_KEY parameter in the config/app.php configuration file. This value is a value containing A string of 32 random characters. If this value is not set correctly, all data encrypted by Laravel is insecure.
Basic usage:
A piece of data can be encrypted through the Crypt facade. All encryption uses OpenSSL and AES-256-CBC cipher. Moreover, all encrypted data will be assigned a "Message Authentication Code" (MAC) to prevent the encrypted string from being tampered with.

This shows that the value generated by encrypt is related to APP_KEY, and after encrypting the data, a mac will be given for security verification when decrypting. Since the APP_KEY needs to be regenerated after the project changes the environment, the previously generated The data cannot be decrypted in the new environment.

The above error report that the MAC value is invalid is not the computer mac address, but laravel's encrypt encryption is related to its app_key, and each data is given a special mac verification code.

After changing the environment, you need to regenerate APP_KEY first, and then the data encrypted using encrypt in the database needs to be re-encrypted.

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