php7.1 universal encryption method

With the continuous development of the Internet, network security is being paid more and more attention. In order to ensure data security, we usually encrypt important data. In web development, commonly used encryption methods include md5, sha1, etc. However, these encryption methods are no longer secure, and attackers can easily crack the encrypted data using methods such as brute force cracking. Therefore, some new encryption methods have emerged, such as the universal encryption method provided in php7.1. This article will introduce how to use the php7.1 universal encryption method.

1. Introduction

The universal encryption method, the Sodium extension, is the encryption extension that comes with php7.1. The Sodium extension provides a set of secure encryption functions, including public key encryption, AES encryption, etc., to protect data security. Compared with previous encryption methods, Sodium extension is more secure and efficient. The encryption algorithm used by the Sodium extension is set by cryptography experts, and its security is guaranteed.

2. Installation

To use the Sodium extension, you need to enable it in the php.ini file. In a Linux environment, you can use the following command to install:

$ sudo apt-get install libsodium-dev

After the installation is complete, you can add the following configuration in php.ini:

extension=sodium.so

3. API

Sodium extension provides a series of secure API functions, including:

• sodium_crypto_secretbox — Use the XSalsa20-Poly1305 algorithm to encrypt a message
• sodium_crypto_secretbox_open — Use the XSalsa20-Poly1305 algorithm to encrypt a message Decrypt a message
• sodium_crypto_box — Encrypt a message using public key encryption
• sodium_crypto_box_open — Decrypt a message using public key encryption
• sodium_crypto_aead_aes256gcm_encrypt — Use AES -GCM algorithm to encrypt a message
• sodium_crypto_aead_aes256gcm_decrypt — Use AES-GCM algorithm to decrypt a message

Among them, sodium_crypto_secretbox_open and sodium_crypto_box_open are mainly used to decrypt messages. Other functions are used to encrypt messages.

The following is a code example for using sodium_crypto_secretbox to encrypt data:

<?php

$plaintext = 'Hello World';
$key = random_bytes(SODIUM_CRYPTO_SECRETBOX_KEYBYTES); // 生成秘钥
$nonce = random_bytes(SODIUM_CRYPTO_SECRETBOX_NONCEBYTES); // 生成随机数

$ciphertext = sodium_crypto_secretbox($plaintext, $nonce, $key);

?>

In the above code, $plaintext is the plaintext, $key is the encryption key, and $nonce is a random number. The sodium_crypto_secretbox function encrypts $plaintext using the XSalsa20-Poly1305 algorithm and returns the encrypted ciphertext.

4. Cryptographic security

When using the Sodium extension for encryption, you need to pay attention to cryptographic security. Some security precautions are as follows:

• Use high-strength secret keys, do not use too simple keys
• Use random numbers for each encryption, do not use the same random number
• Do not use encryption algorithms that have been attacked. It is recommended to use algorithms such as XSalsa20-Poly1305, AES-GCM etc.
• Do not implement encryption algorithms manually, but use ready-made functions

5. Summary

This article introduces the Sodium extension provided in php7.1. The Sodium extension provides a set of secure encryption API functions, including public key encryption, AES encryption, etc., to ensure the security of web applications. The encryption algorithm used by the Sodium extension is safe and reliable, so it is one of the preferred extensions for secure encryption in current web development. When using the Sodium extension for encryption, you need to pay attention to cryptographic security to ensure data security.

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