How to implement data encryption on Linux server via PHP script

How to implement data encryption on a Linux server through PHP script, specific code examples are required

1. Introduction
   Data encryption is very important in modern computer systems a safety measure. By encrypting sensitive data, user privacy and data integrity are protected. This article will introduce how to use PHP scripts to implement data encryption on a Linux server and provide specific code examples.
2. Using the OpenSSL library
   OpenSSL is an open source cryptography tool library that provides a variety of different encryption algorithms and implementations. On a Linux server, you can use PHP's OpenSSL extension to call OpenSSL functions. First you need to make sure that the OpenSSL extension is installed on the server.

The steps to use OpenSSL to encrypt data in a PHP script are as follows:

Step 1: Generate a key pair
First you need to generate a key pair, a public key for To encrypt data, a private key is used to decrypt the data. You can use the following code to generate a key pair:

$config = [
    "digest_alg" => "sha512",
    "private_key_bits" => 4096,
    "private_key_type" => OPENSSL_KEYTYPE_RSA,
];

$res = openssl_pkey_new($config);
openssl_pkey_export($res, $privateKey);
$publicKey = openssl_pkey_get_details($res)['key'];

// 保存私钥和公钥到文件
file_put_contents("private_key.pem", $privateKey);
file_put_contents("public_key.pem", $publicKey);

The above code will generate a 4096-bit RSA key pair and save the private and public keys to private_key.pem and public_key.pem file.

Step 2: Use the public key to encrypt the data
Where the data needs to be encrypted, you can use the following code to encrypt the data:

$publicKey = file_get_contents("public_key.pem");

$data = "要加密的数据";
openssl_public_encrypt($data, $encryptedData, $publicKey);

// 将加密后的数据保存到文件或传输到网络
file_put_contents("encrypted_data.txt", base64_encode($encryptedData));

The above code encrypts the data using the public key, and Save the encrypted data to the encrypted_data.txt file.

Step 3: Use the private key to decrypt the data
If you need to decrypt the data, you can use the following code to decrypt:

$privateKey = file_get_contents("private_key.pem");

$encryptedData = file_get_contents("encrypted_data.txt");
$encryptedData = base64_decode($encryptedData);

openssl_private_decrypt($encryptedData, $decryptedData, $privateKey);

echo $decryptedData;

The above code will use the private key to decrypt the previously encrypted data and will The decrypted data is output to the screen.

3. Summary
   This article introduces how to use PHP scripts to implement data encryption on a Linux server and provides specific code examples. By using the OpenSSL library, you can easily encrypt and decrypt sensitive data and improve system security. In practical applications, it can also be combined with other security measures, such as secure transmission protocols (such as HTTPS), access control, and data backup, to better protect data security.

The above is the detailed content of How to implement data encryption on Linux server via PHP script. For more information, please follow other related articles on the PHP Chinese website!