+ Changed the approach to an OOP model

This commit is contained in:
Daniel Legt 2021-02-28 10:58:55 +02:00
parent a1833a238c
commit 5ae3d8294b
1 changed files with 102 additions and 63 deletions

165
lib.php
View File

@ -1,80 +1,119 @@
<?php <?php
/** /**
* @param string $data The data to be encrypted, this can only encrypt strings. * @author Kato Twofold
* @param string $key The key to use to encrypt the data, this key should be generated using the openssl_random_pseudo_bytes * @copyright MIT
* @param string $cipherMethod The cypher method to use in the encryption process, these can be checked using *
* @param bool $integrity_check Check if the encrypted data can also be decypted, this will take 2x more time to process the data, but will make 100% sure that the data is safe and can be decrypted. * The class has full support for encryption of strings, provides validation for those
* and makes sure they can be decrypted on the other end, the key is extremely important
* and you MUST keep track of it and not lose it as there is no way of getting it back.
*
*/ */
function encryptData( string $data, string $key, string $cipherMethod = 'AES-256-CBC', bool $integrity_check = TRUE) { class kpcrypt {
// Lowercase the cipher // The key to use in the encryption process
$cipherMethod = strtolower($cipherMethod); private $key = null;
// Check if the encryption method is valid /**
if (!in_array($cipherMethod, openssl_get_cipher_methods())) { * @param string $key [Optional] The key to use for encryption, if none is mentioned a random one will be generated
// Cypher was not in the available ciphers list. */
return FALSE; public function __construct( string $key = null) {
// If no key is mentioned, generate one
if ( empty($key) ) {
$key = bin2hex(openssl_random_pseudo_bytes("64"));
}
} }
// To encrypt a string /**
$iv = openssl_random_pseudo_bytes(openssl_cipher_iv_length($cipherMethod)); * Get the key that the instance is currently using, really useful for when you randomly generate it!
* @return string The key of the instance
*/
public function getKey() {
return $this->key;
}
// Encrypt the data /**
$encryptedData = openssl_encrypt($data, $cipherMethod, $key, OPENSSL_RAW_DATA, $iv); * @param string $data The data to be encrypted, this can only encrypt strings.
* @param string $key The key to use to encrypt the data, this key should be generated using the openssl_random_pseudo_bytes
* @param string $cipherMethod The cypher method to use in the encryption process, these can be checked using
* @param bool $integrity_check Check if the encrypted data can also be decypted, this will take 2x more time to process the data, but will make 100% sure that the data is safe and can be decrypted.
*/
function encryptData(string $data, string $key, string $cipherMethod = 'AES-256-CBC', bool $integrity_check = TRUE) {
// Grab the key from self-reference
$key = $this->key;
// Append the iv to the encrypted data // Lowercase the cipher
$encryptedData = $iv . $encryptedData; $cipherMethod = strtolower($cipherMethod);
// base64 encrypt to make sure we don't lose bytes // Check if the encryption method is valid
$encryptedData = base64_encode($encryptedData); if (!in_array($cipherMethod, openssl_get_cipher_methods())) {
// Cypher was not in the available ciphers list.
// Check if we should verify the integrity of the encryption
if ( $integrity_check === TRUE ) {
// Test for decryption validity
if ( md5(decryptData($encryptedData, $key, $cipherMethod)) === md5($data) ) {
// Put the output in the result
return $encryptedData;
} else {
// Assign the output to the result
return FALSE; return FALSE;
} }
} else {
// Simply return the results // To encrypt a string
return $encryptedData; $iv = openssl_random_pseudo_bytes(openssl_cipher_iv_length($cipherMethod));
// Encrypt the data
$encryptedData = openssl_encrypt($data, $cipherMethod, $key, OPENSSL_RAW_DATA, $iv);
// Append the iv to the encrypted data
$encryptedData = $iv . $encryptedData;
// base64 encrypt to make sure we don't lose bytes
$encryptedData = base64_encode($encryptedData);
// Check if we should verify the integrity of the encryption
if ($integrity_check === TRUE) {
// Test for decryption validity
if (md5($this->decryptData($encryptedData, $key, $cipherMethod)) === md5($data)) {
// Put the output in the result
return $encryptedData;
} else {
// Assign the output to the result
return FALSE;
}
} else {
// Simply return the results
return $encryptedData;
}
} }
/**
* @param string $data The data to be encrypted, this can only encrypt strings.
* @param string $key The key to use to encrypt the data, this key should be generated using the openssl_random_pseudo_bytes
* @param string $cipherMethod The cypher method to use in the encryption process, these can be checked using
*/
function decryptData(string $data, string $cipherMethod = 'AES-256-CBC') {
// Grab the key from self-reference
$key = $this->key;
// Lowercase the cipher
$cipherMethod = strtolower($cipherMethod);
// Check if the encryption method is valid
if (!in_array($cipherMethod, openssl_get_cipher_methods())) {
// Cypher was not in the available ciphers list.
return FALSE;
}
// base64 decode the data.
$data = base64_decode($data);
// Get the length of the IV
$iv_length = openssl_cipher_iv_length($cipherMethod);
// Get the IV from the decoded data
$iv = substr($data, 0, $iv_length);
// Get the encrypted string from the data
$data = substr($data, $iv_length);
// Decrypt the data
$data = openssl_decrypt($data, $cipherMethod, $key, OPENSSL_RAW_DATA, $iv);
// Return the data
return $data;
}
} }
/**
* @param string $data The data to be encrypted, this can only encrypt strings.
* @param string $key The key to use to encrypt the data, this key should be generated using the openssl_random_pseudo_bytes
* @param string $cipherMethod The cypher method to use in the encryption process, these can be checked using
*/
function decryptData( string $data, string $key, string $cipherMethod = 'AES-256-CBC' ) {
// Lowercase the cipher
$cipherMethod = strtolower($cipherMethod);
// Check if the encryption method is valid
if (!in_array($cipherMethod, openssl_get_cipher_methods())) {
// Cypher was not in the available ciphers list.
return FALSE;
}
// base64 decode the data.
$data = base64_decode($data);
// Get the length of the IV
$iv_length = openssl_cipher_iv_length($cipherMethod);
// Get the IV from the decoded data
$iv = substr($data,0,$iv_length);
// Get the encrypted string from the data
$data = substr($data, $iv_length);
// Decrypt the data
$data = openssl_decrypt($data,$cipherMethod,$key, OPENSSL_RAW_DATA, $iv);
// Return the data
return $data;
}