96 lines
3.3 KiB
PHP
96 lines
3.3 KiB
PHP
|
<?php
|
||
|
|
|
||
|
|
// The key to use in the encryption
|
||
|
|
$key = "my Key";
|
||
|
|
|
||
|
|
// The string to encrypt, this can be any string.
|
||
|
|
$string = "Super secret password we should store away safely";
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @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) {
|
||
|
|
|
||
|
|
// 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;
|
||
|
|
}
|
||
|
|
|
||
|
|
// To encrypt a string
|
||
|
|
$iv = openssl_random_pseudo_bytes(openssl_cipher_iv_length($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 ( $integrity_check === TRUE ) {
|
||
|
|
// Test for decryption validity
|
||
|
|
if ( md5(decryptData($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 $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;
|
||
|
|
}
|
||
|
|
|
||
|
|
$encryptedData = encryptData($string, $key);
|
||
|
|
|
||
|
|
echo "Encrypted: " . $encryptedData;
|
||
|
|
echo "\n";
|
||
|
|
echo "Decrypted: " . decryptData($encryptedData, $key);
|
||
|
|
echo "\n";
|
||
|
|
echo "Peak Memory: " . memory_get_peak_usage() / 1024 . "Kb";
|