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<?php namespace HashOver;
// Copyright (C) 2010-2018 Jacob Barkdull
// This file is part of HashOver.
//
// HashOver is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// HashOver is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with HashOver. If not, see <http://www.gnu.org/licenses/>.
// Encryption methods
class Encryption
{
protected $prefix;
protected $cost = '$10$';
protected $encryptionHash;
protected $ivSize;
protected $cipher = 'aes-128-cbc';
protected $options;
protected $alphabet = 'aAbBcCdDeEfFgGhHiIjJkKlLmM.nNoOpPqQrRsStTuUvVwWxXyYzZ/0123456789';
public function __construct ($encryption_key)
{
// Throw exception if encryption key isn't at least 8 characters long
if (mb_strlen ($encryption_key, '8bit') < 8) {
throw new Exception ('Encryption key must by at least 8 characters long.');
}
// Blowfish prefix
$this->prefix = (version_compare (PHP_VERSION, '5.3.7') < 0) ? '$2a' : '$2y';
// OpenSSL raw output/options
$this->options = defined ('OPENSSL_RAW_DATA') ? OPENSSL_RAW_DATA : true;
// SHA-256 hash array
$this->encryptionHash = str_split (hash ('sha256', $encryption_key));
// OpenSSL cipher IV
$this->ivSize = openssl_cipher_iv_length ($this->cipher);
}
// Creates Blowfish hash for passwords
public function createHash ($string)
{
// Alphanumeric character array
$alphabet = str_split ($this->alphabet);
// Shuffle alphanumeric character array as to randomize it
shuffle ($alphabet);
// Initial salt
$salt = '';
// Generate random 20 character alphanumeric string
foreach (array_rand ($alphabet, 20) as $character) {
$salt .= $alphabet[$character];
}
// Blowfish hash
$hash = crypt ($string, $this->prefix . $this->cost . $salt . '$$');
// Return hashed string
return $hash;
}
// Creates Blowfish hash with salt from supplied hash
public function verifyHash ($string, $compare)
{
// Split string by dollar sign
$parts = explode ('$', $compare);
// Hash salt
$salt = !empty ($parts[3]) ? $parts[3] : '';
// Encryption string as Blowfish hash
$hash = crypt ($string, $this->prefix . $this->cost . $salt . '$$');
// Returns true if both match
return ($hash === $compare);
}
// Generates a random encryption key
public function createKey ($string)
{
// Shuffle alphanumeric character array as to randomize it
shuffle ($string);
// Initial array keys
$keys = array ();
// Initial key
$key = '';
// Generate random string from encryption key SHA-256 hash
for ($k = 0; $k < 16; $k++) {
// Add encryption key character index to keys array
$keys[] = array_search ($string[$k], $this->encryptionHash);
// Add encryption key character to key
$key .= $string[$k];
}
// Return random string and list of encryption hash array keys
return array (
'key' => $key,
'keys' => join (',', $keys)
);
}
// OpenSSL encrypt with random key from SHA-256 hash for e-mails
public function encrypt ($string)
{
// Get a random encryption key
$key_pair = $this->createKey ($this->encryptionHash);
// Get pseudo-random bytes for OpenSSL IV
$iv = openssl_random_pseudo_bytes ($this->ivSize);
// OpenSSL encrypt using random encryption key
$ciphertext = openssl_encrypt (
$string,
$this->cipher,
$key_pair['key'],
$this->options,
$iv
);
// Return encrypted value and list of encryption hash array keys
return array (
'encrypted' => base64_encode ($iv . $ciphertext),
'keys' => $key_pair['keys']
);
}
// Decrypt OpenSSL encrypted string
public function decrypt ($string, $keys)
{
// Return false if string or keys is empty
if (empty ($string) or empty ($keys)) {
return false;
}
// Initial key
$key = '';
// Split keys string into array
$keys = explode (',', $keys);
// Retrieve random key from array
foreach ($keys as $value) {
// Cast key to integer
$hash_key = (int)($value);
// Give up if any array value isn't valid
if (!isset ($this->encryptionHash[$hash_key])) {
return '';
}
// Add character to decryption key
$key .= $this->encryptionHash[$hash_key];
}
// Decode base64 encoded string
$decode = base64_decode ($string, true);
// Setup OpenSSL IV
$iv = mb_substr ($decode, 0, $this->ivSize, '8bit');
// Setup OpenSSL cipher text
$full_length = mb_strlen ($decode, '8bit');
$deciphertext = mb_substr ($decode, $this->ivSize, $full_length, '8bit');
// Return OpenSSL decrypted string
return openssl_decrypt (
$deciphertext,
$this->cipher,
$key,
$this->options,
$iv
);
}
}
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