mirror of
https://github.com/danog/phpseclib.git
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- CFB mode is now supported as a stream cipher
git-svn-id: http://phpseclib.svn.sourceforge.net/svnroot/phpseclib/trunk@122 21d32557-59b3-4da0-833f-c5933fad653e
This commit is contained in:
Jim Wigginton
parent
bbe68cf7ae
commit
76655b8bf9
@ -56,7 +56,7 @@
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* @author Jim Wigginton <terrafrost@php.net>
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* @copyright MMVIII Jim Wigginton
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* @license http://www.gnu.org/licenses/lgpl.txt
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* @version $Id: AES.php,v 1.8 2010-09-12 21:58:54 terrafrost Exp $
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* @version $Id: AES.php,v 1.9 2010-09-26 03:10:20 terrafrost Exp $
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* @link http://phpseclib.sourceforge.net
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*/
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@ -191,7 +191,6 @@ class Crypt_AES extends Crypt_Rijndael {
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//$this->mode = in_array('ctr', mcrypt_list_modes()) ? 'ctr' : CRYPT_AES_MODE_CTR;
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break;
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case CRYPT_AES_MODE_CFB:
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$this->paddable = true;
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$this->mode = 'ncfb';
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break;
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case CRYPT_AES_MODE_OFB:
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@ -203,6 +202,8 @@ class Crypt_AES extends Crypt_Rijndael {
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$this->mode = MCRYPT_MODE_CBC;
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}
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$this->debuffer = $this->enbuffer = '';
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break;
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default:
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switch ($mode) {
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@ -214,7 +215,6 @@ class Crypt_AES extends Crypt_Rijndael {
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$this->mode = CRYPT_RIJNDAEL_MODE_CTR;
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break;
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case CRYPT_AES_MODE_CFB:
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$this->paddable = true;
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$this->mode = CRYPT_RIJNDAEL_MODE_CFB;
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break;
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case CRYPT_AES_MODE_OFB:
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@ -265,6 +265,7 @@ class Crypt_AES extends Crypt_Rijndael {
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function encrypt($plaintext)
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{
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if ( CRYPT_AES_MODE == CRYPT_AES_MODE_MCRYPT ) {
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$changed = $this->changed;
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$this->_mcryptSetup();
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/*
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if ($this->mode == CRYPT_AES_MODE_CTR) {
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@ -277,6 +278,44 @@ class Crypt_AES extends Crypt_Rijndael {
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return $ciphertext;
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}
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*/
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// re: http://phpseclib.sourceforge.net/cfb-demo.phps
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// using mcrypt's default handing of CFB the above would output two different things. using phpseclib's
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// rewritten CFB implementation the above outputs the same thing twice.
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if ($this->mode == 'ncfb') {
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static $ecb;
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if ($changed) {
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$ecb = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_ECB, '');
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mcrypt_generic_init($ecb, $this->key, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0");
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}
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if (strlen($this->enbuffer)) {
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$ciphertext = $plaintext ^ substr($this->encryptIV, strlen($this->enbuffer));
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$this->enbuffer.= $ciphertext;
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if (strlen($this->enbuffer) == 16) {
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$this->encryptIV = $this->enbuffer;
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$this->enbuffer = '';
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mcrypt_generic_init($this->enmcrypt, $this->key, $this->encryptIV);
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}
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$plaintext = substr($plaintext, strlen($ciphertext));
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} else {
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$ciphertext = '';
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}
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$last_pos = strlen($plaintext) & 0xFFFFFFF0;
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$ciphertext.= $last_pos ? mcrypt_generic($this->enmcrypt, substr($plaintext, 0, $last_pos)) : '';
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if (strlen($plaintext) & 0xF) {
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if (strlen($ciphertext)) {
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$this->encryptIV = substr($ciphertext, -16);
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}
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$this->encryptIV = mcrypt_generic($ecb, $this->encryptIV);
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$this->enbuffer = substr($plaintext, $last_pos) ^ $this->encryptIV;
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$ciphertext.= $this->enbuffer;
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}
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return $ciphertext;
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}
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if ($this->paddable) {
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$plaintext = $this->_pad($plaintext);
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@ -306,6 +345,7 @@ class Crypt_AES extends Crypt_Rijndael {
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function decrypt($ciphertext)
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{
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if ( CRYPT_AES_MODE == CRYPT_AES_MODE_MCRYPT ) {
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$changed = $this->changed;
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$this->_mcryptSetup();
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/*
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if ($this->mode == CRYPT_AES_MODE_CTR) {
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@ -318,6 +358,42 @@ class Crypt_AES extends Crypt_Rijndael {
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return $plaintext;
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}
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*/
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if ($this->mode == 'ncfb') {
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static $ecb;
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if ($changed) {
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$ecb = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_ECB, '');
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mcrypt_generic_init($ecb, $this->key, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0");
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}
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if (strlen($this->debuffer)) {
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$plaintext = $ciphertext ^ substr($this->decryptIV, strlen($this->debuffer));
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$this->debuffer.= substr($ciphertext, 0, strlen($plaintext));
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if (strlen($this->debuffer) == 16) {
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$this->decryptIV = $this->debuffer;
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$this->debuffer = '';
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mcrypt_generic_init($this->demcrypt, $this->key, $this->decryptIV);
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}
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$ciphertext = substr($ciphertext, strlen($plaintext));
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} else {
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$plaintext = '';
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}
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$last_pos = strlen($ciphertext) & 0xFFFFFFF0;
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$plaintext.= $last_pos ? mdecrypt_generic($this->demcrypt, substr($ciphertext, 0, $last_pos)) : '';
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if (strlen($ciphertext) & 0xF) {
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if (strlen($plaintext)) {
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$this->decryptIV = substr($ciphertext, $last_pos - 16, 16);
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}
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$this->decryptIV = mcrypt_generic($ecb, $this->decryptIV);
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$this->debuffer = substr($ciphertext, $last_pos);
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$plaintext.= $this->debuffer ^ $this->decryptIV;
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}
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return $plaintext;
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}
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if ($this->paddable) {
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// we pad with chr(0) since that's what mcrypt_generic does. to quote from http://php.net/function.mcrypt-generic :
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@ -53,7 +53,7 @@
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* @author Jim Wigginton <terrafrost@php.net>
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* @copyright MMVII Jim Wigginton
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* @license http://www.gnu.org/licenses/lgpl.txt
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* @version $Id: DES.php,v 1.14 2010-09-12 21:58:54 terrafrost Exp $
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* @version $Id: DES.php,v 1.15 2010-09-26 03:10:20 terrafrost Exp $
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* @link http://phpseclib.sourceforge.net
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*/
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@ -305,7 +305,6 @@ class Crypt_DES {
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//$this->mode = in_array('ctr', mcrypt_list_modes()) ? 'ctr' : CRYPT_DES_MODE_CTR;
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break;
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case CRYPT_DES_MODE_CFB:
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$this->paddable = true;
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$this->mode = 'ncfb';
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break;
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case CRYPT_DES_MODE_OFB:
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@ -321,12 +320,12 @@ class Crypt_DES {
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default:
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switch ($mode) {
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case CRYPT_DES_MODE_ECB:
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case CRYPT_DES_MODE_CFB:
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case CRYPT_DES_MODE_CBC:
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$this->paddable = true;
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$this->mode = $mode;
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break;
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case CRYPT_DES_MODE_CTR:
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case CRYPT_DES_MODE_CBC:
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case CRYPT_DES_MODE_CFB:
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case CRYPT_DES_MODE_OFB:
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$this->mode = $mode;
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break;
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@ -439,10 +438,47 @@ class Crypt_DES {
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$this->enmcrypt = mcrypt_module_open(MCRYPT_DES, '', $this->mode, '');
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}
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mcrypt_generic_init($this->enmcrypt, $this->keys, $this->encryptIV);
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if ($this->mode != 'ncfb') {
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$this->enchanged = false;
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}
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}
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if ($this->mode != 'ncfb') {
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$ciphertext = mcrypt_generic($this->enmcrypt, $plaintext);
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} else {
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static $ecb;
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if ($this->enchanged) {
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$ecb = mcrypt_module_open(MCRYPT_DES, '', MCRYPT_MODE_ECB, '');
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mcrypt_generic_init($ecb, $this->keys, "\0\0\0\0\0\0\0\0");
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$this->enchanged = false;
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}
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$ciphertext = mcrypt_generic($this->enmcrypt, $plaintext);
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if (strlen($this->enbuffer)) {
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$ciphertext = $plaintext ^ substr($this->encryptIV, strlen($this->enbuffer));
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$this->enbuffer.= $ciphertext;
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if (strlen($this->enbuffer) == 8) {
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$this->encryptIV = $this->enbuffer;
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$this->enbuffer = '';
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mcrypt_generic_init($this->enmcrypt, $this->keys, $this->encryptIV);
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}
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$plaintext = substr($plaintext, strlen($ciphertext));
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} else {
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$ciphertext = '';
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}
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$last_pos = strlen($plaintext) & 0xFFFFFFF8;
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$ciphertext.= $last_pos ? mcrypt_generic($this->enmcrypt, substr($plaintext, 0, $last_pos)) : '';
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if (strlen($plaintext) & 0x7) {
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if (strlen($ciphertext)) {
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$this->encryptIV = substr($ciphertext, -8);
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}
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$this->encryptIV = mcrypt_generic($ecb, $this->encryptIV);
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$this->enbuffer = substr($plaintext, $last_pos) ^ $this->encryptIV;
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$ciphertext.= $this->enbuffer;
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}
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}
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if (!$this->continuousBuffer) {
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mcrypt_generic_init($this->enmcrypt, $this->keys, $this->encryptIV);
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@ -456,6 +492,7 @@ class Crypt_DES {
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}
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$buffer = &$this->enbuffer;
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$continuousBuffer = $this->continuousBuffer;
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$ciphertext = '';
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switch ($this->mode) {
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case CRYPT_DES_MODE_ECB:
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@ -499,12 +536,31 @@ class Crypt_DES {
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}
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break;
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case CRYPT_DES_MODE_CFB:
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if (!empty($buffer['xor'])) {
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$ciphertext = $plaintext ^ $buffer['xor'];
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$iv = $buffer['encrypted'] . $ciphertext;
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$start = strlen($ciphertext);
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$buffer['encrypted'].= $ciphertext;
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$buffer['xor'] = substr($buffer['xor'], strlen($ciphertext));
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} else {
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$ciphertext = '';
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$iv = $this->encryptIV;
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for ($i = 0; $i < strlen($plaintext); $i+=8) {
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$start = 0;
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}
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for ($i = $start; $i < strlen($plaintext); $i+=8) {
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$block = substr($plaintext, $i, 8);
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$iv = $block ^ $this->_processBlock($iv, CRYPT_DES_ENCRYPT);
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$xor = $this->_processBlock($iv, CRYPT_DES_ENCRYPT);
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$iv = $block ^ $xor;
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if ($continuousBuffer && strlen($iv) != 8) {
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$buffer = array(
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'encrypted' => $iv,
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'xor' => substr($xor, strlen($iv))
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);
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}
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$ciphertext.= $iv;
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}
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if ($this->continuousBuffer) {
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$this->encryptIV = $iv;
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}
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@ -559,10 +615,50 @@ class Crypt_DES {
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$this->demcrypt = mcrypt_module_open(MCRYPT_DES, '', $this->mode, '');
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}
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mcrypt_generic_init($this->demcrypt, $this->keys, $this->decryptIV);
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if ($this->mode != 'ncfb') {
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$this->dechanged = false;
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}
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}
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if ($this->mode != 'ncfb') {
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$plaintext = mdecrypt_generic($this->demcrypt, $ciphertext);
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} else {
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static $ecb;
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if ($this->dechanged) {
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$ecb = mcrypt_module_open(MCRYPT_DES, '', MCRYPT_MODE_ECB, '');
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mcrypt_generic_init($ecb, $this->keys, "\0\0\0\0\0\0\0\0");
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$this->dechanged = false;
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}
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$plaintext = mdecrypt_generic($this->demcrypt, $ciphertext);
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if (strlen($this->debuffer)) {
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$plaintext = $ciphertext ^ substr($this->decryptIV, strlen($this->debuffer));
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$this->debuffer.= substr($ciphertext, 0, strlen($plaintext));
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if (strlen($this->debuffer) == 8) {
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$this->decryptIV = $this->debuffer;
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$this->debuffer = '';
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mcrypt_generic_init($this->demcrypt, $this->keys, $this->decryptIV);
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}
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$ciphertext = substr($ciphertext, strlen($plaintext));
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} else {
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$plaintext = '';
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}
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$last_pos = strlen($ciphertext) & 0xFFFFFFF8;
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$plaintext.= $last_pos ? mdecrypt_generic($this->demcrypt, substr($ciphertext, 0, $last_pos)) : '';
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if (strlen($ciphertext) & 0x7) {
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if (strlen($plaintext)) {
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$this->decryptIV = substr($ciphertext, $last_pos - 8, 8);
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}
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$this->decryptIV = mcrypt_generic($ecb, $this->decryptIV);
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$this->debuffer = substr($ciphertext, $last_pos);
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$plaintext.= $this->debuffer ^ $this->decryptIV;
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}
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return $plaintext;
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}
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if (!$this->continuousBuffer) {
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mcrypt_generic_init($this->demcrypt, $this->keys, $this->decryptIV);
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@ -576,6 +672,7 @@ class Crypt_DES {
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}
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$buffer = &$this->debuffer;
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$continuousBuffer = $this->continuousBuffer;
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$plaintext = '';
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switch ($this->mode) {
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case CRYPT_DES_MODE_ECB:
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@ -618,14 +715,33 @@ class Crypt_DES {
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}
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break;
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case CRYPT_DES_MODE_CFB:
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if (!empty($buffer['ciphertext'])) {
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$plaintext = $ciphertext ^ substr($this->decryptIV, strlen($buffer['ciphertext']));
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$buffer['ciphertext'].= substr($ciphertext, 0, strlen($plaintext));
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if (strlen($buffer['ciphertext']) == 8) {
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$xor = $this->_processBlock($buffer['ciphertext'], CRYPT_DES_ENCRYPT);
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$buffer['ciphertext'] = '';
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}
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$start = strlen($plaintext);
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$block = $this->decryptIV;
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} else {
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$plaintext = '';
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$xor = $this->_processBlock($this->decryptIV, CRYPT_DES_ENCRYPT);
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for ($i = 0; $i < strlen($ciphertext); $i+=8) {
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$start = 0;
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}
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for ($i = $start; $i < strlen($ciphertext); $i+=8) {
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$block = substr($ciphertext, $i, 8);
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$plaintext.= $block ^ $xor;
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if ($continuousBuffer && strlen($block) != 8) {
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$buffer['ciphertext'].= $block;
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$block = $xor;
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} else if (strlen($block) == 8) {
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$xor = $this->_processBlock($block, CRYPT_DES_ENCRYPT);
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}
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}
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if ($this->continuousBuffer) {
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$this->decryptIV = $xor;
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$this->decryptIV = $block;
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}
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break;
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case CRYPT_DES_MODE_OFB:
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@ -62,7 +62,7 @@
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* @author Jim Wigginton <terrafrost@php.net>
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* @copyright MMIX Jim Wigginton
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* @license http://www.gnu.org/licenses/lgpl.txt
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* @version $Id: RSA.php,v 1.19 2010-09-12 21:58:54 terrafrost Exp $
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* @version $Id: RSA.php,v 1.20 2010-09-26 03:10:20 terrafrost Exp $
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* @link http://phpseclib.sourceforge.net
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*/
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@ -784,13 +784,12 @@ class Crypt_RSA {
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}
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$symkey = substr($symkey, 0, 16);
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break;
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// CFB mode needs to work as a stream cipher for this to work
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//case 'DES-EDE3-CFB':
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// if (!class_exists('Crypt_TripleDES')) {
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// require_once('Crypt/TripleDES.php');
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// }
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// $crypto = new Crypt_TripleDES(CRYPT_DES_MODE_CFB);
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// break;
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case 'DES-EDE3-CFB':
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if (!class_exists('Crypt_TripleDES')) {
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require_once('Crypt/TripleDES.php');
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}
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$crypto = new Crypt_TripleDES(CRYPT_DES_MODE_CFB);
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break;
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case 'DES-EDE3-CBC':
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if (!class_exists('Crypt_TripleDES')) {
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require_once('Crypt/TripleDES.php');
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@ -64,7 +64,7 @@
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* @author Jim Wigginton <terrafrost@php.net>
|
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* @copyright MMVIII Jim Wigginton
|
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* @license http://www.gnu.org/licenses/lgpl.txt
|
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* @version $Id: Rijndael.php,v 1.13 2010-09-12 21:58:54 terrafrost Exp $
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* @version $Id: Rijndael.php,v 1.14 2010-09-26 03:10:20 terrafrost Exp $
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* @link http://phpseclib.sourceforge.net
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*/
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@ -384,7 +384,7 @@ class Crypt_Rijndael {
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* @var String
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* @access private
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*/
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var $enbuffer = '';
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var $enbuffer = array('encrypted' => '', 'xor' => '');
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|
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/**
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* Decryption buffer for CTR, OFB and CFB modes
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@ -393,7 +393,7 @@ class Crypt_Rijndael {
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* @var String
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* @access private
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*/
|
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var $debuffer = '';
|
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var $debuffer = array('ciphertext' => '');
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|
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/**
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* Default Constructor.
|
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@ -409,12 +409,12 @@ class Crypt_Rijndael {
|
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{
|
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switch ($mode) {
|
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case CRYPT_RIJNDAEL_MODE_ECB:
|
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case CRYPT_RIJNDAEL_MODE_CFB:
|
||||
case CRYPT_RIJNDAEL_MODE_CBC:
|
||||
$this->paddable = true;
|
||||
$this->mode = $mode;
|
||||
break;
|
||||
case CRYPT_RIJNDAEL_MODE_CBC:
|
||||
case CRYPT_RIJNDAEL_MODE_CTR:
|
||||
case CRYPT_RIJNDAEL_MODE_CFB:
|
||||
case CRYPT_RIJNDAEL_MODE_OFB:
|
||||
$this->mode = $mode;
|
||||
break;
|
||||
@ -662,6 +662,7 @@ class Crypt_Rijndael {
|
||||
|
||||
$block_size = $this->block_size;
|
||||
$buffer = &$this->enbuffer;
|
||||
$continuousBuffer = $this->continuousBuffer;
|
||||
$ciphertext = '';
|
||||
switch ($this->mode) {
|
||||
case CRYPT_RIJNDAEL_MODE_ECB:
|
||||
@ -705,12 +706,31 @@ class Crypt_Rijndael {
|
||||
}
|
||||
break;
|
||||
case CRYPT_RIJNDAEL_MODE_CFB:
|
||||
if (!empty($buffer['xor'])) {
|
||||
$ciphertext = $plaintext ^ $buffer['xor'];
|
||||
$iv = $buffer['encrypted'] . $ciphertext;
|
||||
$start = strlen($ciphertext);
|
||||
$buffer['encrypted'].= $ciphertext;
|
||||
$buffer['xor'] = substr($buffer['xor'], strlen($ciphertext));
|
||||
} else {
|
||||
$ciphertext = '';
|
||||
$iv = $this->encryptIV;
|
||||
for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
|
||||
$start = 0;
|
||||
}
|
||||
|
||||
for ($i = $start; $i < strlen($plaintext); $i+=$block_size) {
|
||||
$block = substr($plaintext, $i, $block_size);
|
||||
$iv = $block ^ $this->_encryptBlock($iv);
|
||||
$xor = $this->_encryptBlock($iv);
|
||||
$iv = $block ^ $xor;
|
||||
if ($continuousBuffer && strlen($iv) != $block_size) {
|
||||
$buffer = array(
|
||||
'encrypted' => $iv,
|
||||
'xor' => substr($xor, strlen($iv))
|
||||
);
|
||||
}
|
||||
$ciphertext.= $iv;
|
||||
}
|
||||
|
||||
if ($this->continuousBuffer) {
|
||||
$this->encryptIV = $iv;
|
||||
}
|
||||
@ -764,6 +784,7 @@ class Crypt_Rijndael {
|
||||
|
||||
$block_size = $this->block_size;
|
||||
$buffer = &$this->debuffer;
|
||||
$continuousBuffer = $this->continuousBuffer;
|
||||
$plaintext = '';
|
||||
switch ($this->mode) {
|
||||
case CRYPT_RIJNDAEL_MODE_ECB:
|
||||
@ -806,14 +827,33 @@ class Crypt_Rijndael {
|
||||
}
|
||||
break;
|
||||
case CRYPT_RIJNDAEL_MODE_CFB:
|
||||
$iv = $this->_encryptBlock($this->decryptIV);
|
||||
for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
|
||||
if (!empty($buffer['ciphertext'])) {
|
||||
$plaintext = $ciphertext ^ substr($this->decryptIV, strlen($buffer['ciphertext']));
|
||||
$buffer['ciphertext'].= substr($ciphertext, 0, strlen($plaintext));
|
||||
if (strlen($buffer['ciphertext']) == $block_size) {
|
||||
$xor = $this->_encryptBlock($buffer['ciphertext']);
|
||||
$buffer['ciphertext'] = '';
|
||||
}
|
||||
$start = strlen($plaintext);
|
||||
$block = $this->decryptIV;
|
||||
} else {
|
||||
$plaintext = '';
|
||||
$xor = $this->_encryptBlock($this->decryptIV);
|
||||
$start = 0;
|
||||
}
|
||||
|
||||
for ($i = $start; $i < strlen($ciphertext); $i+=$block_size) {
|
||||
$block = substr($ciphertext, $i, $block_size);
|
||||
$plaintext.= $block ^ $iv;
|
||||
$iv = $this->_encryptBlock($block);
|
||||
$plaintext.= $block ^ $xor;
|
||||
if ($continuousBuffer && strlen($block) != $block_size) {
|
||||
$buffer['ciphertext'].= $block;
|
||||
$block = $xor;
|
||||
} else if (strlen($block) == $block_size) {
|
||||
$xor = $this->_encryptBlock($block);
|
||||
}
|
||||
}
|
||||
if ($this->continuousBuffer) {
|
||||
$this->decryptIV = $iv;
|
||||
$this->decryptIV = $block;
|
||||
}
|
||||
break;
|
||||
case CRYPT_RIJNDAEL_MODE_OFB:
|
||||
|
||||
@ -47,7 +47,7 @@
|
||||
* @author Jim Wigginton <terrafrost@php.net>
|
||||
* @copyright MMVII Jim Wigginton
|
||||
* @license http://www.gnu.org/licenses/lgpl.txt
|
||||
* @version $Id: TripleDES.php,v 1.15 2010-09-12 21:58:54 terrafrost Exp $
|
||||
* @version $Id: TripleDES.php,v 1.16 2010-09-26 03:10:20 terrafrost Exp $
|
||||
* @link http://phpseclib.sourceforge.net
|
||||
*/
|
||||
|
||||
@ -273,7 +273,6 @@ class Crypt_TripleDES {
|
||||
$this->mode = 'ctr';
|
||||
break;
|
||||
case CRYPT_DES_MODE_CFB:
|
||||
$this->paddable = true;
|
||||
$this->mode = 'ncfb';
|
||||
break;
|
||||
case CRYPT_DES_MODE_OFB:
|
||||
@ -300,12 +299,12 @@ class Crypt_TripleDES {
|
||||
|
||||
switch ($mode) {
|
||||
case CRYPT_DES_MODE_ECB:
|
||||
case CRYPT_DES_MODE_CFB:
|
||||
case CRYPT_DES_MODE_CBC:
|
||||
$this->paddable = true;
|
||||
$this->mode = $mode;
|
||||
break;
|
||||
case CRYPT_DES_MODE_CTR:
|
||||
case CRYPT_DES_MODE_CBC:
|
||||
case CRYPT_DES_MODE_CFB:
|
||||
case CRYPT_DES_MODE_OFB:
|
||||
$this->mode = $mode;
|
||||
break;
|
||||
@ -432,10 +431,47 @@ class Crypt_TripleDES {
|
||||
$this->enmcrypt = mcrypt_module_open(MCRYPT_3DES, '', $this->mode, '');
|
||||
}
|
||||
mcrypt_generic_init($this->enmcrypt, $this->key, $this->encryptIV);
|
||||
if ($this->mode != 'ncfb') {
|
||||
$this->enchanged = false;
|
||||
}
|
||||
}
|
||||
|
||||
if ($this->mode != 'ncfb') {
|
||||
$ciphertext = mcrypt_generic($this->enmcrypt, $plaintext);
|
||||
} else {
|
||||
static $ecb;
|
||||
|
||||
if ($this->enchanged) {
|
||||
$ecb = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_ECB, '');
|
||||
mcrypt_generic_init($ecb, $this->key, "\0\0\0\0\0\0\0\0");
|
||||
$this->enchanged = false;
|
||||
}
|
||||
|
||||
$ciphertext = mcrypt_generic($this->enmcrypt, $plaintext);
|
||||
if (strlen($this->enbuffer)) {
|
||||
$ciphertext = $plaintext ^ substr($this->encryptIV, strlen($this->enbuffer));
|
||||
$this->enbuffer.= $ciphertext;
|
||||
if (strlen($this->enbuffer) == 8) {
|
||||
$this->encryptIV = $this->enbuffer;
|
||||
$this->enbuffer = '';
|
||||
mcrypt_generic_init($this->enmcrypt, $this->key, $this->encryptIV);
|
||||
}
|
||||
$plaintext = substr($plaintext, strlen($ciphertext));
|
||||
} else {
|
||||
$ciphertext = '';
|
||||
}
|
||||
|
||||
$last_pos = strlen($plaintext) & 0xFFFFFFF8;
|
||||
$ciphertext.= $last_pos ? mcrypt_generic($this->enmcrypt, substr($plaintext, 0, $last_pos)) : '';
|
||||
|
||||
if (strlen($plaintext) & 0x7) {
|
||||
if (strlen($ciphertext)) {
|
||||
$this->encryptIV = substr($ciphertext, -8);
|
||||
}
|
||||
$this->encryptIV = mcrypt_generic($ecb, $this->encryptIV);
|
||||
$this->enbuffer = substr($plaintext, $last_pos) ^ $this->encryptIV;
|
||||
$ciphertext.= $this->enbuffer;
|
||||
}
|
||||
}
|
||||
|
||||
if (!$this->continuousBuffer) {
|
||||
mcrypt_generic_init($this->enmcrypt, $this->key, $this->encryptIV);
|
||||
@ -453,6 +489,7 @@ class Crypt_TripleDES {
|
||||
$des = $this->des;
|
||||
|
||||
$buffer = &$this->enbuffer;
|
||||
$continuousBuffer = $this->continuousBuffer;
|
||||
$ciphertext = '';
|
||||
switch ($this->mode) {
|
||||
case CRYPT_DES_MODE_ECB:
|
||||
@ -515,15 +552,34 @@ class Crypt_TripleDES {
|
||||
}
|
||||
break;
|
||||
case CRYPT_DES_MODE_CFB:
|
||||
if (!empty($buffer['xor'])) {
|
||||
$ciphertext = $plaintext ^ $buffer['xor'];
|
||||
$iv = $buffer['encrypted'] . $ciphertext;
|
||||
$start = strlen($ciphertext);
|
||||
$buffer['encrypted'].= $ciphertext;
|
||||
$buffer['xor'] = substr($buffer['xor'], strlen($ciphertext));
|
||||
} else {
|
||||
$ciphertext = '';
|
||||
$iv = $this->encryptIV;
|
||||
for ($i = 0; $i < strlen($plaintext); $i+=8) {
|
||||
$start = 0;
|
||||
}
|
||||
|
||||
for ($i = $start; $i < strlen($plaintext); $i+=8) {
|
||||
$block = substr($plaintext, $i, 8);
|
||||
$iv = $des[0]->_processBlock($iv, CRYPT_DES_ENCRYPT);
|
||||
$iv = $des[1]->_processBlock($iv, CRYPT_DES_DECRYPT);
|
||||
$iv = $des[2]->_processBlock($iv, CRYPT_DES_ENCRYPT);
|
||||
$iv^= $block;
|
||||
$xor= $des[2]->_processBlock($iv, CRYPT_DES_ENCRYPT);
|
||||
|
||||
$iv = $block ^ $xor;
|
||||
if ($continuousBuffer && strlen($iv) != 8) {
|
||||
$buffer = array(
|
||||
'encrypted' => $iv,
|
||||
'xor' => substr($xor, strlen($iv))
|
||||
);
|
||||
}
|
||||
$ciphertext.= $iv;
|
||||
}
|
||||
|
||||
if ($this->continuousBuffer) {
|
||||
$this->encryptIV = $iv;
|
||||
}
|
||||
@ -585,10 +641,50 @@ class Crypt_TripleDES {
|
||||
$this->demcrypt = mcrypt_module_open(MCRYPT_3DES, '', $this->mode, '');
|
||||
}
|
||||
mcrypt_generic_init($this->demcrypt, $this->key, $this->decryptIV);
|
||||
if ($this->mode != 'ncfb') {
|
||||
$this->dechanged = false;
|
||||
}
|
||||
}
|
||||
|
||||
if ($this->mode != 'ncfb') {
|
||||
$plaintext = mdecrypt_generic($this->demcrypt, $ciphertext);
|
||||
} else {
|
||||
static $ecb;
|
||||
|
||||
if ($this->dechanged) {
|
||||
$ecb = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_ECB, '');
|
||||
mcrypt_generic_init($ecb, $this->key, "\0\0\0\0\0\0\0\0");
|
||||
$this->dechanged = false;
|
||||
}
|
||||
|
||||
$plaintext = mdecrypt_generic($this->demcrypt, $ciphertext);
|
||||
if (strlen($this->debuffer)) {
|
||||
$plaintext = $ciphertext ^ substr($this->decryptIV, strlen($this->debuffer));
|
||||
|
||||
$this->debuffer.= substr($ciphertext, 0, strlen($plaintext));
|
||||
if (strlen($this->debuffer) == 8) {
|
||||
$this->decryptIV = $this->debuffer;
|
||||
$this->debuffer = '';
|
||||
mcrypt_generic_init($this->demcrypt, $this->key, $this->decryptIV);
|
||||
}
|
||||
$ciphertext = substr($ciphertext, strlen($plaintext));
|
||||
} else {
|
||||
$plaintext = '';
|
||||
}
|
||||
|
||||
$last_pos = strlen($ciphertext) & 0xFFFFFFF8;
|
||||
$plaintext.= $last_pos ? mdecrypt_generic($this->demcrypt, substr($ciphertext, 0, $last_pos)) : '';
|
||||
|
||||
if (strlen($ciphertext) & 0x7) {
|
||||
if (strlen($plaintext)) {
|
||||
$this->decryptIV = substr($ciphertext, $last_pos - 8, 8);
|
||||
}
|
||||
$this->decryptIV = mcrypt_generic($ecb, $this->decryptIV);
|
||||
$this->debuffer = substr($ciphertext, $last_pos);
|
||||
$plaintext.= $this->debuffer ^ $this->decryptIV;
|
||||
}
|
||||
|
||||
return $plaintext;
|
||||
}
|
||||
|
||||
if (!$this->continuousBuffer) {
|
||||
mcrypt_generic_init($this->demcrypt, $this->key, $this->decryptIV);
|
||||
@ -606,6 +702,7 @@ class Crypt_TripleDES {
|
||||
$des = $this->des;
|
||||
|
||||
$buffer = &$this->enbuffer;
|
||||
$continuousBuffer = $this->continuousBuffer;
|
||||
$plaintext = '';
|
||||
switch ($this->mode) {
|
||||
case CRYPT_DES_MODE_ECB:
|
||||
@ -662,6 +759,121 @@ class Crypt_TripleDES {
|
||||
}
|
||||
break;
|
||||
case CRYPT_DES_MODE_CFB:
|
||||
if (!empty($buffer['ciphertext'])) {
|
||||
$plaintext = $ciphertext ^ substr($this->decryptIV, strlen($buffer['ciphertext']));
|
||||
$buffer['ciphertext'].= substr($ciphertext, 0, strlen($plaintext));
|
||||
if (strlen($buffer['ciphertext']) == 8) {
|
||||
$xor = $des[0]->_processBlock($buffer['ciphertext'], CRYPT_DES_ENCRYPT);
|
||||
$xor = $des[1]->_processBlock($xor, CRYPT_DES_DECRYPT);
|
||||
$xor = $des[2]->_processBlock($xor, CRYPT_DES_ENCRYPT);
|
||||
$buffer['ciphertext'] = '';
|
||||
}
|
||||
$start = strlen($plaintext);
|
||||
$block = $this->decryptIV;
|
||||
} else {
|
||||
$plaintext = '';
|
||||
$xor = $des[0]->_processBlock($this->decryptIV, CRYPT_DES_ENCRYPT);
|
||||
$xor = $des[1]->_processBlock($xor, CRYPT_DES_DECRYPT);
|
||||
$xor = $des[2]->_processBlock($xor, CRYPT_DES_ENCRYPT);
|
||||
$start = 0;
|
||||
}
|
||||
|
||||
for ($i = $start; $i < strlen($ciphertext); $i+=8) {
|
||||
$block = substr($ciphertext, $i, 8);
|
||||
$plaintext.= $block ^ $xor;
|
||||
if ($continuousBuffer && strlen($block) != 8) {
|
||||
$buffer['ciphertext'].= $block;
|
||||
$block = $xor;
|
||||
} else if (strlen($block) == 8) {
|
||||
$xor = $des[0]->_processBlock($block, CRYPT_DES_ENCRYPT);
|
||||
$xor = $des[1]->_processBlock($xor, CRYPT_DES_DECRYPT);
|
||||
$xor = $des[2]->_processBlock($xor, CRYPT_DES_ENCRYPT);
|
||||
}
|
||||
}
|
||||
if ($this->continuousBuffer) {
|
||||
$this->decryptIV = $block;
|
||||
}
|
||||
break;
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
$iv = $this->decryptIV;
|
||||
for ($i = 0; $i < strlen($ciphertext); $i+=8) {
|
||||
$block = substr($ciphertext, $i, 8);
|
||||
$iv = $des[0]->_processBlock($iv, CRYPT_DES_ENCRYPT);
|
||||
$iv = $des[1]->_processBlock($iv, CRYPT_DES_DECRYPT);
|
||||
$iv = $des[2]->_processBlock($iv, CRYPT_DES_ENCRYPT);
|
||||
$plaintext.= $iv ^ $block;
|
||||
$iv = $block;
|
||||
}
|
||||
if ($this->continuousBuffer) {
|
||||
$this->decryptIV = $block;
|
||||
}
|
||||
break;
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
if (!empty($buffer)) {
|
||||
$plaintext = $ciphertext ^ $buffer['xor'];
|
||||
$iv = $buffer['decrypted'] . $plaintext;
|
||||
$start = strlen($plaintext);
|
||||
$buffer = array();
|
||||
} else {
|
||||
$iv = $this->decryptIV;
|
||||
$start = 0;
|
||||
}
|
||||
|
||||
for ($i = $start; $i < strlen($ciphertext); $i+=8) {
|
||||
$block = substr($ciphertext, $i, 8);
|
||||
$xor = $des[0]->_processBlock($iv, CRYPT_DES_ENCRYPT);
|
||||
$xor = $des[1]->_processBlock($xor, CRYPT_DES_DECRYPT);
|
||||
$xor = $des[2]->_processBlock($xor, CRYPT_DES_ENCRYPT);
|
||||
|
||||
/*
|
||||
$xor = $des[2]->_processBlock($iv, CRYPT_DES_DECRYPT);
|
||||
$xor = $des[1]->_processBlock($xor, CRYPT_DES_ENCRYPT);
|
||||
$xor = $des[0]->_processBlock($xor, CRYPT_DES_DECRYPT);
|
||||
*/
|
||||
|
||||
//$xor = $this->_encryptBlock($iv);
|
||||
$iv = $block ^ $xor;
|
||||
if ($continuousBuffer && strlen($iv) != 8) {
|
||||
$buffer = array(
|
||||
'decrypted' => $iv,
|
||||
'xor' => substr($xor, strlen($iv))
|
||||
);
|
||||
}
|
||||
$plaintext.= $iv;
|
||||
}
|
||||
|
||||
if ($this->continuousBuffer) {
|
||||
$this->decryptIV = $xor;
|
||||
}
|
||||
break;
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
$iv = $this->decryptIV;
|
||||
for ($i = 0; $i < strlen($ciphertext); $i+=8) {
|
||||
$block = substr($ciphertext, $i, 8);
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user