PHP implementation of data encryption and decryption in WeChat applet

WeChat Mini Program is a new experience developed by WeChat, which allows users to directly use the functions of web pages without installing software. In WeChat mini programs, in order to ensure data security, developers need to encrypt and decrypt data. This article will introduce how to implement PHP implementation of data encryption and decryption in WeChat applet.

1. WeChat Mini Program Data Encryption and Decryption Algorithm

The encryption and decryption algorithm of WeChat Mini Program is based on the AES-128-CBC encryption mode and requires the use of a 16-byte random string. As the initial vector and perform the filling operation. When encrypting or decrypting data, the padded data needs to be processed accordingly.

2. PHP implements data encryption and decryption

The following will introduce in detail how to implement WeChat applet data encryption and decryption in PHP.

1. Encrypted data

In PHP, the method of using openssl library to encrypt data is as follows:

function encrypt($data, $iv, $key){
   $block_size = 16;
   //补位处理
   $padding = $block_size - strlen($data) % $block_size;
   $data .= str_repeat(chr($padding), $padding);
   //加密
   $encrypted = openssl_encrypt($data, 'AES-128-CBC', $key, OPENSSL_RAW_DATA, $iv);
   return base64_encode($encrypted);
}

In the above code, $data needs to be encrypted The data, $iv is the initial vector, $key is the key. First, the data is padded to ensure that the data length is divisible by 16, then the openssl_encrypt function is used to encrypt the data, and base64 is used to encode the output.

2. Decrypt data

In PHP, the method of using openssl library to decrypt data is as follows:

function decrypt($encrypted, $iv, $key){
   $encrypted = base64_decode($encrypted);
   $decrypted = openssl_decrypt($encrypted, 'AES-128-CBC', $key, OPENSSL_RAW_DATA, $iv);
   //去除补位信息
   $padding = ord(substr($decrypted, -1));
   if($padding < 1 || $padding > $block_size) {
       $padding = 0;
   }
   $decrypted = substr($decrypted, 0, strlen($decrypted) - $padding);
   return $decrypted;
}

In the above code, $encrypted needs to be decrypted The data, $iv is the initial vector, $key is the key. First, the data is decoded using base64 and then decrypted using the openssl_decrypt function. After the decryption is completed, the padding information needs to be removed to obtain the real data.

3. Summary

This article introduces the algorithm for data encryption and decryption of WeChat applet and its implementation in PHP. During use, you need to pay attention to using the correct key and initial vector. Through the introduction of this article, I hope readers can master the implementation method of data encryption and decryption of WeChat mini programs, thereby providing help for the development of mini programs.

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