Openssl encrypt php with key

<?php
//$key previously generated safely, ie: openssl_random_pseudo_bytes
$plaintext = "message to be encrypted";
$ivlen = openssl_cipher_iv_length($cipher="AES-128-CBC");
$iv = openssl_random_pseudo_bytes($ivlen);
$ciphertext_raw = openssl_encrypt($plaintext, $cipher, $key, $options=OPENSSL_RAW_DATA, $iv);
$hmac = hash_hmac('sha256', $ciphertext_raw, $key, $as_binary=true);
$ciphertext = base64_encode( $iv.$hmac.$ciphertext_raw );

//decrypt later....
$c = base64_decode($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);
$original_plaintext = openssl_decrypt($ciphertext_raw, $cipher, $key, $options=OPENSSL_RAW_DATA, $iv);
$calcmac = hash_hmac('sha256', $ciphertext_raw, $key, $as_binary=true);
if (hash_equals($hmac, $calcmac))// timing attack safe comparison
{
    echo $original_plaintext."\n";
}
?>

Source: php.net

Similar codes

3 votes153 views1 answer
Increase phpmyadmin upload limit cpanel
PHP
12 votes157 views4 answers
Php convert array to object
PHP
-1 vote165 views1 answer
Php get error
PHP
12 votes138 views6 answers
Set session data in laravel
PHP
6 votes141 views1 answer
PDOException::("SQLSTATE[42000]: Syntax error or access violation: 1071 Specified key was too long; max key length is 1000 bytes") laravel 8
PHP
1 vote249 views2 answers
Magento2 zend log
PHP Zend
0 vote158 views1 answer
Php get header language
PHP
-2 votes155 views3 answers
Laravel where condition with if
PHP
2 votes143 views1 answer
Retrieving a cookie in php
PHP
2 votes160 views1 answer
Addition in php
PHP