function SendEncryptedResponse($message)
{
$aes = new AES(AES_MODE_CBC);
$aes->setKeyLength(256);
$aes->setKey(Base64UrlDecode($_SESSION['key']));
$aes->setIV(Base64UrlDecode($_SESSION['iv']));
$aes->enablePadding();
// This is PKCS
echo Base64UrlEncode($aes->encrypt($message));
exit;
}
/**
* Break a public or private key down into its constituant components
*
* @access private
* @see _convertPublicKey()
* @see _convertPrivateKey()
* @param String $key
* @param Integer $type
* @return Array
*/
function _parseKey($key, $type)
{
switch ($type) {
case RSA_PUBLIC_FORMAT_RAW:
if (!is_array($key)) {
return false;
}
$components = array();
switch (true) {
case isset($key['e']):
$components['publicExponent'] = $key['e']->copy();
break;
case isset($key['exponent']):
$components['publicExponent'] = $key['exponent']->copy();
break;
case isset($key['publicExponent']):
$components['publicExponent'] = $key['publicExponent']->copy();
break;
case isset($key[0]):
$components['publicExponent'] = $key[0]->copy();
}
switch (true) {
case isset($key['n']):
$components['modulus'] = $key['n']->copy();
break;
case isset($key['modulo']):
$components['modulus'] = $key['modulo']->copy();
break;
case isset($key['modulus']):
$components['modulus'] = $key['modulus']->copy();
break;
case isset($key[1]):
$components['modulus'] = $key[1]->copy();
}
return $components;
case RSA_PRIVATE_FORMAT_PKCS1:
case RSA_PUBLIC_FORMAT_PKCS1:
/* Although PKCS#1 proposes a format that public and private keys can use, encrypting them is
"outside the scope" of PKCS#1. PKCS#1 then refers you to PKCS#12 and PKCS#15 if you're wanting to
protect private keys, however, that's not what OpenSSL* does. OpenSSL protects private keys by adding
two new "fields" to the key - DEK-Info and Proc-Type. These fields are discussed here:
http://tools.ietf.org/html/rfc1421#section-4.6.1.1
http://tools.ietf.org/html/rfc1421#section-4.6.1.3
DES-EDE3-CBC as an algorithm, however, is not discussed anywhere, near as I can tell.
DES-CBC and DES-EDE are discussed in RFC1423, however, DES-EDE3-CBC isn't, nor is its key derivation
function. As is, the definitive authority on this encoding scheme isn't the IETF but rather OpenSSL's
own implementation. ie. the implementation *is* the standard and any bugs that may exist in that
implementation are part of the standard, as well.
* OpenSSL is the de facto standard. It's utilized by OpenSSH and other projects */
if (preg_match('#DEK-Info: (.+),(.+)#', $key, $matches)) {
$iv = pack('H*', trim($matches[2]));
$symkey = pack('H*', md5($this->password . substr($iv, 0, 8)));
// symkey is short for symmetric key
$symkey .= substr(pack('H*', md5($symkey . $this->password . $iv)), 0, 8);
$ciphertext = preg_replace('#.+(\\r|\\n|\\r\\n)\\1|[\\r\\n]|-.+-#s', '', $key);
$ciphertext = preg_match('#^[a-zA-Z\\d/+]*={0,2}$#', $ciphertext) ? base64_decode($ciphertext) : false;
if ($ciphertext === false) {
$ciphertext = $key;
}
switch ($matches[1]) {
case 'AES-128-CBC':
if (!class_exists('AES')) {
require_once 'Crypt/AES.php';
}
$symkey = substr($symkey, 0, 16);
$crypto = new AES();
break;
case 'DES-EDE3-CFB':
if (!class_exists('TripleDES')) {
require_once 'Crypt/TripleDES.php';
}
$crypto = new TripleDES(DES_MODE_CFB);
break;
case 'DES-EDE3-CBC':
if (!class_exists('TripleDES')) {
require_once 'Crypt/TripleDES.php';
}
$crypto = new TripleDES();
break;
case 'DES-CBC':
if (!class_exists('DES')) {
require_once 'Crypt/DES.php';
}
$crypto = new DES();
break;
default:
return false;
}
$crypto->setKey($symkey);
$crypto->setIV($iv);
$decoded = $crypto->decrypt($ciphertext);
} else {
$decoded = preg_replace('#-.+-|[\\r\\n]#', '', $key);
$decoded = preg_match('#^[a-zA-Z\\d/+]*={0,2}$#', $decoded) ? base64_decode($decoded) : false;
}
if ($decoded !== false) {
$key = $decoded;
}
$components = array();
if (ord($this->_string_shift($key)) != RSA_ASN1_SEQUENCE) {
return false;
}
if ($this->_decodeLength($key) != strlen($key)) {
return false;
}
$tag = ord($this->_string_shift($key));
if ($tag == RSA_ASN1_SEQUENCE) {
/* intended for keys for which OpenSSL's asn1parse returns the following:
0:d=0 hl=4 l= 290 cons: SEQUENCE
4:d=1 hl=2 l= 13 cons: SEQUENCE
6:d=2 hl=2 l= 9 prim: OBJECT :rsaEncryption
17:d=2 hl=2 l= 0 prim: NULL
19:d=1 hl=4 l= 271 prim: BIT STRING */
$this->_string_shift($key, $this->_decodeLength($key));
$this->_string_shift($key);
// skip over the BIT STRING tag
$this->_decodeLength($key);
// skip over the BIT STRING length
// "The initial octet shall encode, as an unsigned binary integer wtih bit 1 as the least significant bit, the number of
// unused bits in teh final subsequent octet. The number shall be in the range zero to seven."
// -- http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf (section 8.6.2.2)
$this->_string_shift($key);
if (ord($this->_string_shift($key)) != RSA_ASN1_SEQUENCE) {
return false;
}
if ($this->_decodeLength($key) != strlen($key)) {
return false;
}
$tag = ord($this->_string_shift($key));
}
if ($tag != RSA_ASN1_INTEGER) {
return false;
}
$length = $this->_decodeLength($key);
$temp = $this->_string_shift($key, $length);
if (strlen($temp) != 1 || ord($temp) > 2) {
$components['modulus'] = new BigInteger($temp, -256);
$this->_string_shift($key);
// skip over RSA_ASN1_INTEGER
$length = $this->_decodeLength($key);
$components[$type == RSA_PUBLIC_FORMAT_PKCS1 ? 'publicExponent' : 'privateExponent'] = new BigInteger($this->_string_shift($key, $length), -256);
return $components;
}
if (ord($this->_string_shift($key)) != RSA_ASN1_INTEGER) {
return false;
}
$length = $this->_decodeLength($key);
$components['modulus'] = new BigInteger($this->_string_shift($key, $length), -256);
$this->_string_shift($key);
$length = $this->_decodeLength($key);
$components['publicExponent'] = new BigInteger($this->_string_shift($key, $length), -256);
$this->_string_shift($key);
$length = $this->_decodeLength($key);
$components['privateExponent'] = new BigInteger($this->_string_shift($key, $length), -256);
$this->_string_shift($key);
$length = $this->_decodeLength($key);
$components['primes'] = array(1 => new BigInteger($this->_string_shift($key, $length), -256));
$this->_string_shift($key);
$length = $this->_decodeLength($key);
$components['primes'][] = new BigInteger($this->_string_shift($key, $length), -256);
$this->_string_shift($key);
$length = $this->_decodeLength($key);
$components['exponents'] = array(1 => new BigInteger($this->_string_shift($key, $length), -256));
$this->_string_shift($key);
$length = $this->_decodeLength($key);
$components['exponents'][] = new BigInteger($this->_string_shift($key, $length), -256);
$this->_string_shift($key);
$length = $this->_decodeLength($key);
$components['coefficients'] = array(2 => new BigInteger($this->_string_shift($key, $length), -256));
if (!empty($key)) {
if (ord($this->_string_shift($key)) != RSA_ASN1_SEQUENCE) {
return false;
}
$this->_decodeLength($key);
while (!empty($key)) {
if (ord($this->_string_shift($key)) != RSA_ASN1_SEQUENCE) {
return false;
}
$this->_decodeLength($key);
$key = substr($key, 1);
$length = $this->_decodeLength($key);
$components['primes'][] = new BigInteger($this->_string_shift($key, $length), -256);
$this->_string_shift($key);
$length = $this->_decodeLength($key);
$components['exponents'][] = new BigInteger($this->_string_shift($key, $length), -256);
$this->_string_shift($key);
$length = $this->_decodeLength($key);
$components['coefficients'][] = new BigInteger($this->_string_shift($key, $length), -256);
}
}
return $components;
case RSA_PUBLIC_FORMAT_OPENSSH:
$key = base64_decode(preg_replace('#^ssh-rsa | .+$#', '', $key));
if ($key === false) {
return false;
}
$cleanup = substr($key, 0, 11) == "ssh-rsa";
extract(unpack('Nlength', $this->_string_shift($key, 4)));
$publicExponent = new BigInteger($this->_string_shift($key, $length), -256);
extract(unpack('Nlength', $this->_string_shift($key, 4)));
$modulus = new BigInteger($this->_string_shift($key, $length), -256);
if ($cleanup && strlen($key)) {
extract(unpack('Nlength', $this->_string_shift($key, 4)));
return array('modulus' => new BigInteger($this->_string_shift($key, $length), -256), 'publicExponent' => $modulus);
} else {
return array('modulus' => $modulus, 'publicExponent' => $publicExponent);
}
// http://www.w3.org/TR/xmldsig-core/#sec-RSAKeyValue
// http://en.wikipedia.org/wiki/XML_Signature
// http://www.w3.org/TR/xmldsig-core/#sec-RSAKeyValue
// http://en.wikipedia.org/wiki/XML_Signature
case RSA_PRIVATE_FORMAT_XML:
case RSA_PUBLIC_FORMAT_XML:
$this->components = array();
$xml = xml_parser_create('UTF-8');
xml_set_object($xml, $this);
xml_set_element_handler($xml, '_start_element_handler', '_stop_element_handler');
xml_set_character_data_handler($xml, '_data_handler');
if (!xml_parse($xml, $key)) {
return false;
}
return $this->components;
// from PuTTY's SSHPUBK.C
// from PuTTY's SSHPUBK.C
case RSA_PRIVATE_FORMAT_PUTTY:
$components = array();
$key = preg_split('#\\r\\n|\\r|\\n#', $key);
$type = trim(preg_replace('#PuTTY-User-Key-File-2: (.+)#', '$1', $key[0]));
if ($type != 'ssh-rsa') {
return false;
}
$encryption = trim(preg_replace('#Encryption: (.+)#', '$1', $key[1]));
$publicLength = trim(preg_replace('#Public-Lines: (\\d+)#', '$1', $key[3]));
$public = base64_decode(implode('', array_map('trim', array_slice($key, 4, $publicLength))));
$public = substr($public, 11);
extract(unpack('Nlength', $this->_string_shift($public, 4)));
$components['publicExponent'] = new BigInteger($this->_string_shift($public, $length), -256);
extract(unpack('Nlength', $this->_string_shift($public, 4)));
$components['modulus'] = new BigInteger($this->_string_shift($public, $length), -256);
$privateLength = trim(preg_replace('#Private-Lines: (\\d+)#', '$1', $key[$publicLength + 4]));
$private = base64_decode(implode('', array_map('trim', array_slice($key, $publicLength + 5, $privateLength))));
switch ($encryption) {
case 'aes256-cbc':
if (!class_exists('AES')) {
require_once 'Crypt/AES.php';
}
$symkey = '';
$sequence = 0;
while (strlen($symkey) < 32) {
$temp = pack('Na*', $sequence++, $this->password);
$symkey .= pack('H*', sha1($temp));
}
$symkey = substr($symkey, 0, 32);
$crypto = new AES();
}
if ($encryption != 'none') {
$crypto->setKey($symkey);
$crypto->disablePadding();
$private = $crypto->decrypt($private);
if ($private === false) {
return false;
}
}
extract(unpack('Nlength', $this->_string_shift($private, 4)));
$components['privateExponent'] = new BigInteger($this->_string_shift($private, $length), -256);
extract(unpack('Nlength', $this->_string_shift($private, 4)));
$components['primes'] = array(1 => new BigInteger($this->_string_shift($private, $length), -256));
extract(unpack('Nlength', $this->_string_shift($private, 4)));
$components['primes'][] = new BigInteger($this->_string_shift($private, $length), -256);
$temp = $components['primes'][1]->subtract($this->one);
$components['exponents'] = array(1 => $components['publicExponent']->modInverse($temp));
$temp = $components['primes'][2]->subtract($this->one);
$components['exponents'][] = $components['publicExponent']->modInverse($temp);
extract(unpack('Nlength', $this->_string_shift($private, 4)));
$components['coefficients'] = array(2 => new BigInteger($this->_string_shift($private, $length), -256));
return $components;
}
}
<?php
//
// Copyright (c) 2011 Scott Clayton
//
// This file is part of the C# to PHP Encryption Library.
//
// The C# to PHP Encryption Library is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The C# to PHP Encryption Library 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with the C# to PHP Encryption Library. If not, see <http://www.gnu.org/licenses/>.
//
use Simbacode\Xcrypto\Crypt\AES;
$aes = new AES();
$aes->setKey('abcdefghijklmnopabcdefghijklmnop');
$aes->setIV('abcdefghijklmnop');
$aes->setKeyLength(256);
echo base64_encode("abcdefghijklmnopabcdefghijklmnop") . "<BR>";
echo base64_encode("abcdefghijklmnop") . "<BR>";
$plaintext = 'llamas are super cool!';
echo base64_encode($aes->encrypt($plaintext)) . "<BR>";
echo $aes->decrypt($aes->encrypt($plaintext));
/**
* Encrypts the message to be sent using AES.
* Make sure you have not output any other text before or after calling this.
*
* @param String $message The message to be transported online
*/
function SendEncryptedResponse($message)
{
$aes = new AES(AES_MODE_CBC);
$aes->setKeyLength(256);
$aes->setKey($this->Base64UrlDecode($this->key));
$aes->setIV($this->Base64UrlDecode($this->iv));
$aes->enablePadding();
// This is PKCS
echo $this->Base64UrlEncode($aes->encrypt($message));
exit;
}