如何利用PHP开发记账系统的数据加密功能 - 提供数据加密功能的开发指南

$plaintext = "要加密的数据";
$encryption_key = "加密密钥";
$encryption_method = "AES-256-CBC";
$iv = "初始向量";
$encrypted = openssl_encrypt($plaintext, $encryption_method, $encryption_key, 0, $iv);

$encrypted = "加密后的数据";
$encryption_key = "加密密钥";
$encryption_method = "AES-256-CBC";
$iv = "初始向量";
$decrypted = openssl_decrypt($encrypted, $encryption_method, $encryption_key, 0, $iv);

$plaintext = "要加密的数据";
$public_key = openssl_pkey_get_public(file_get_contents("public.pem"));
openssl_public_encrypt($plaintext, $encrypted, $public_key);

$encrypted = "加密后的数据";
$private_key = openssl_pkey_get_private(file_get_contents("private.pem"));
openssl_private_decrypt($encrypted, $decrypted, $private_key);

$password = "用户密码";
$hashed_password = password_hash($password, PASSWORD_DEFAULT);
// 将hashed_password存储到数据库

$password = "用户输入的密码";
$hashed_password = "从数据库中获取的加密密码";
if (password_verify($password, $hashed_password)) {
    // 登录成功
} else {
    // 登录失败
}

$data = "要加密的数据";
$encryption_key = "加密密钥";
$encryption_method = "AES-256-CBC";
$iv = "初始向量";
$encrypted_data = openssl_encrypt($data, $encryption_method, $encryption_key, 0, $iv);
// 将encrypted_data存储到数据库

$encrypted_data = "从数据库中获取的加密数据";
$decrypted_data = openssl_decrypt($encrypted_data, $encryption_method, $encryption_key, 0, $iv);