шифрование php

encrypt_decrypt.php

<?

define('ENCRYPTION_KEY', 'EncryptDecryptPHP201908Y');

// Encrypt

function encrypt($plaintext){
	$ivlen = openssl_cipher_iv_length($cipher="AES-128-CBC");
	$iv = openssl_random_pseudo_bytes($ivlen);
	$ciphertext_raw = openssl_encrypt($plaintext, $cipher, ENCRYPTION_KEY, $options=OPENSSL_RAW_DATA, $iv);
	$hmac = hash_hmac('sha256', $ciphertext_raw, ENCRYPTION_KEY, $as_binary=true);
	$ciphertext = base64_encode( $iv.$hmac.$ciphertext_raw );
	return $ciphertext;
}

// Decrypt

function decrypt($ciphertext){
	$c = base64_decode($ciphertext);
	$ivlen = openssl_cipher_iv_length($cipher="AES-128-CBC");
	$iv = substr($c, 0, $ivlen);
	$hmac = substr($c, $ivlen, $sha2len=32);
	$ciphertext_raw = substr($c, $ivlen+$sha2len);
	$plaintext = openssl_decrypt($ciphertext_raw, $cipher, ENCRYPTION_KEY, $options=OPENSSL_RAW_DATA, $iv);
	$calcmac = hash_hmac('sha256', $ciphertext_raw, ENCRYPTION_KEY, $as_binary=true);
	if (hash_equals($hmac, $calcmac))
	{
		return $plaintext;
	}
}

?>