How to use php7 encryption method to protect code security

Preface

With the rapid development of the Internet, the security of websites, apps and other applications is becoming more and more important. In the process of developing applications, in order to protect the code from being stolen and tampered by malicious attackers, code encryption is very necessary. This article will introduce how to use php7's encryption method to protect the security of your code.

1. What is code encryption?

Code encryption is to transcode, obfuscate or encrypt the code so that the code cannot be read directly during runtime, thereby enhancing code confidentiality and security, thereby preventing malicious attacks and illegal tampering.

2. Why use code encryption?

1. Protect code security: Encrypted code can prevent hackers from cracking, stealing and other malicious behaviors;
2. Prevent code plagiarism: Encrypted code will become difficult Understand, thereby preventing others from plagiarizing the code;
3. Improve code execution efficiency: During the encryption process, some code optimization can be performed to improve code execution efficiency.

3. How to implement code encryption?

In versions below php7, code encryption can be achieved by converting the code into opcode. In php7 and above, you can use the sodium extension or openssl extension to encrypt php code. This article describes how to use the sodium extension for code encryption.

1. Install the sodium extension

First, you need to install the sodium extension, you can do it in the following way:

In the Linux system, execute:

apt-get install libsodium-dev
pecl install libsodium

In Windows systems, you can use [Sodium independent installation package](https://support.microsoft.com/zh-cn/help/2977003/the-latest-supported-visual-c-downloads) for installation.

2. Encrypt PHP code

The process of code encryption includes the following steps:

(1) Package the PHP file that needs to be encrypted.

(2) Encrypt the packaged files.

Use the following command to package the php file:

tar cvf mycode.tar mycode.php

Use the following command to encrypt the packaged file:

sodium -e mycode.tar -o mycode.so -p 1d3f7b760c4b4a7b4a4e4d7c762c4739

Among them, the -p parameter is used to set the key, Different encryption methods can be achieved by setting different keys. You can generate your own keys for setup.

3. Decrypt php code

Use the following command to decrypt the encrypted file:

sodium -d mycode.so -o mycode.tar -p 1d3f7b760c4b4a7b4a4e4d7c762c4739

Among them, the -p parameter needs to be set and encrypted Same key.

4. Notes

1. The encrypted file needs to be the same version of PHP used for encryption.
2. Since the encrypted code becomes difficult to understand, it is best to comment, indent, etc. before encrypting the code.
3. It is also recommended to use code obfuscation tools, such as Obfuscator, to further enhance the security of the code.

5. Summary

Code encryption can well protect the security of the code and prevent malicious attacks and illegal tampering. When encrypting code, you need to pay attention to the choice of encryption method and the setting of the key. At the same time, code obfuscation tools and other methods can be combined to further enhance code security.

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