Encrypt and Decrypt Data Securely in PHP: OpenSSL, Sodium & defuse/php-encryption (code to accompany https://youtu.be/VCdFFQvJl2k)

openssl.php

<?php

$cipher_algo = 'AES-256-CBC';

$key = 'encryption key here';

$iv_length = openssl_cipher_iv_length($cipher_algo);

$iv = openssl_random_pseudo_bytes($iv_length);

// $options = OPENSSL_RAW_DATA;
$options = 0;

$plaintext = readline('Enter some text: ');

$ciphertext = openssl_encrypt($plaintext, $cipher_algo, $key, $options, $iv);

echo "Original string: $plaintext\n";

echo "Encrypted string: $ciphertext\n";

$decrypted = openssl_decrypt($ciphertext, $cipher_algo, $key, $options, $iv);

echo "Decrypted string: $decrypted\n";

php-encryption.php

<?php

use Defuse\Crypto\Key;
use Defuse\Crypto\Crypto;

require 'vendor/autoload.php';

$key_ascii = 'encryption key here';

$key = Key::loadFromAsciiSafeString($key_ascii);

$plaintext = readline('Enter some text: ');

$ciphertext = Crypto::encrypt($plaintext, $key);

echo "Original string: $plaintext\n";

echo "Encrypted string: $ciphertext\n";

$decrypted = Crypto::decrypt($ciphertext, $key);

echo "Decrypted string: $decrypted\n";

sodium.php

<?php

$key = 'encryption key here';

$nonce = random_bytes(SODIUM_CRYPTO_SECRETBOX_NONCEBYTES);

$plaintext = readline('Enter some text: ');

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

echo "Original string: $plaintext\n";

echo "Encrypted string: $ciphertext\n";

echo "Encrypted string hex: " . bin2hex($ciphertext) . "\n";

$decrypted = sodium_crypto_secretbox_open($ciphertext, $nonce, $key);

echo "Decrypted string: $decrypted\n";