PHP AES 加解密示例

<?php
// 加密函数
function encrypt($data, $key) {
    $iv = openssl_random_pseudo_bytes(openssl_cipher_iv_length('aes-256-cbc'));
    $encrypted = openssl_encrypt($data, 'aes-256-cbc', $key, 0, $iv);
    return base64_encode($iv . $encrypted);
}
 
// 解密函数
function decrypt($data, $key) {
    $data = base64_decode($data);
    $iv = substr($data, 0, openssl_cipher_iv_length('aes-256-cbc'));
    $data = substr($data, openssl_cipher_iv_length('aes-256-cbc'));
    $decrypted = openssl_decrypt($data, 'aes-256-cbc', $key, 0, $iv);
    return $decrypted;
}
 
// 使用示例
$key = 'your-256-bit-secret'; // 256位密钥
$plaintext = 'Hello, World!';
 
// 加密
$encrypted = encrypt($plaintext, $key);
echo "Encrypted: " . $encrypted . "\n";
 
// 解密
$decrypted = decrypt($encrypted, $key);
echo "Decrypted: " . $decrypted . "\n";
?>

这段代码提供了AES-256-CBC加密算法的加解密函数，并展示了如何使用这些函数进行数据加密和解密。在实际应用中，应该使用强随机密钥，并确保其安全传输。