What is the method for encrypting with AES in PHP?

1 year ago
Ava Mitchell
2 minutes

In PHP, the openssl library can be used to implement AES encryption.

Here is an example code using the openssl library to perform AES encryption.

<?php
function encrypt($data, $key, $iv) {
    $ciphertext = openssl_encrypt($data, 'AES-128-CBC', $key, OPENSSL_RAW_DATA, $iv);
    return base64_encode($ciphertext);
}

function decrypt($data, $key, $iv) {
    $ciphertext = base64_decode($data);
    return openssl_decrypt($ciphertext, 'AES-128-CBC', $key, OPENSSL_RAW_DATA, $iv);
}

$data = 'Hello, World!';
$key = '0123456789abcdef';
$iv = 'fedcba9876543210';

$encrypted = encrypt($data, $key, $iv);
echo 'Encrypted: ' . $encrypted . "\n";

$decrypted = decrypt($encrypted, $key, $iv);
echo 'Decrypted: ' . $decrypted . "\n";
?>

In the above code, the encrypt function encrypts data using the openssl_encrypt function with AES encryption, and then converts the encrypted data to a readable string using the base64_encode function. The decrypt function decrypts the encrypted data by first converting the encrypted string back to binary data using the base64_decode function, and then decrypting it using the openssl_decrypt function.

Please note that the AES-128 algorithm and CBC mode are used in the examples above, you can adjust the parameters of the openssl_encrypt and openssl_decrypt functions if you need to use a different algorithm or mode.

At the same time, make sure that the OpenSSL extension is installed, or else the above code cannot be used.

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