Encryption and decryption implementation method developed in PHP in WeChat applet

As WeChat mini programs become more and more popular in the mobile application market, its development has also received more and more attention. In small programs, PHP, as a commonly used back-end language, is often used to handle the encryption and decryption of sensitive data. This article will introduce how to use PHP to implement encryption and decryption in WeChat applet.

1. What are encryption and decryption?

Encryption is the conversion of sensitive data into an unreadable form to ensure that the data is not stolen or tampered with during transmission. Decryption is the restoration of encrypted data to original data.

In mini programs, encryption and decryption usually include the processing of sensitive data such as user passwords, ID numbers, bank card numbers, etc. Therefore, it is very important to implement encryption and decryption functions correctly.

2. Basic principles of PHP encryption and decryption

In PHP, encryption and decryption usually use the concepts of algorithms and keys. Algorithms are the process used to convert raw data into encrypted data, while keys are the process used to verify and decrypt data.

In mini programs, commonly used encryption algorithms include AES, RSA, etc. The key needs to be kept safe and secret.

3. Steps to implement PHP encryption and decryption in WeChat mini program

1. Set the key and encryption algorithm

In the mini program, you first need to Generate keys and select encryption algorithms. This process can be achieved using PHP's openssl extension, for example:

$secret_key = 'abcd1234'; //Key
$secret_iv = '1234abcd'; //Vector
$encrypt_method = ' AES-256-CBC'; //Encryption algorithm

Among them, $secret_key is the key, $secret_iv is the vector, and $encrypt_method is the encryption algorithm used. The AES-256-CBC algorithm is used here.

2. Implement the encryption process

In PHP, use openssl_encrypt function to implement the encryption process, for example:

function encrypt($data) {
global $secret_key, $secret_iv, $encrypt_method;
$output = false;
$key = hash('sha256', $secret_key);
$iv = substr(hash('sha256', $ secret_iv), 0, 16);
$output = openssl_encrypt($data, $encrypt_method, $key, 0, $iv);
$output = base64_encode($output);
return $output;
}

Among them, $data is the original data to be encrypted, $key is the processed key, and $iv is the processed vector. The encryption process uses the openssl_encrypt function and encodes the output in base64 form.

3. Implementing the decryption process

Similar to the encryption process, the decryption process is implemented using the openssl_decrypt function, for example:

function decrypt($data) {
global $secret_key, $secret_iv, $encrypt_method;
$output = false;
$key = hash('sha256', $secret_key);
$iv = substr(hash('sha256', $secret_iv), 0, 16);
$output = openssl_decrypt(base64_decode($data), $encrypt_method, $key, 0, $iv);
return $output;
}

Where $data is the data to be decrypted, $key and $iv are the same as the encryption process. The decryption process uses the openssl_decrypt function and returns the output as raw data.

4. Application Example

Finally, we provide a complete application example. For example, we need to encrypt and decrypt the user's mobile phone number. The sample code is as follows:

$phone = '13812345678';
$encrypted_phone = encrypt($phone);
$decrypted_phone = decrypt($encrypted_phone);

Among them, $ encrypted_phone is the encrypted mobile phone number, $decrypted_phone is the decrypted mobile phone number.

This article introduces a simple method to use PHP to implement encryption and decryption in WeChat applet. As a mini program developer, it is very important to ensure the security and privacy of your data. Therefore, correctly implementing encryption and decryption functions can help us protect the security of users' sensitive data.

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