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use openssl to encrypt and decrypt data with key

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This commit is contained in:
Uwe Steinmann 2023-04-18 20:09:03 +02:00
parent 63ee505c0f
commit a43a09a0e2
1 changed files with 42 additions and 10 deletions
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32
inc/inc.Utils.php
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@ -582,11 +582,28 @@ function checkQuota($user) { /* {{{ */
* @return string encrypted data
*/
function encryptData($key, $value) { /* {{{ */
if(function_exists('openssl_cipher_iv_length')) {
$nonceSize = openssl_cipher_iv_length('aes-256-ctr');
$nonce = openssl_random_pseudo_bytes($nonceSize);
$ciphertext = openssl_encrypt(
$value,
'aes-256-ctr',
$key,
OPENSSL_RAW_DATA,
$nonce
);
// Now let's pack the IV and the ciphertext together
// Naively, we can just concatenate
return $nonce.$ciphertext;
} else {
$text = $value;
$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
$crypttext = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $text, MCRYPT_MODE_ECB, $iv);
return $crypttext;
}
} /* }}} */
/**
@ -597,11 +614,26 @@ function encryptData($key, $value) { /* {{{ */
* @return string plain text data
*/
function decryptData($key, $value) { /* {{{ */
if(function_exists('openssl_cipher_iv_length')) {
$nonceSize = openssl_cipher_iv_length('aes-256-ctr');
$nonce = mb_substr($value, 0, $nonceSize, '8bit');
$ciphertext = mb_substr($value, $nonceSize, null, '8bit');
$plaintext = openssl_decrypt(
$ciphertext,
'aes-256-ctr',
$key,
OPENSSL_RAW_DATA,
$nonce
);
return $plaintext;
} else {
$crypttext = $value;
$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
$decrypttext = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, $crypttext, MCRYPT_MODE_ECB, $iv);
return trim($decrypttext);
}
} /* }}} */
/**