* setKey('abcdefghijklmnop'); * * $size = 10 * 1024; * $plaintext = ''; * for ($i = 0; $i < $size; $i++) { * $plaintext.= 'a'; * } * * echo $rijndael->decrypt($rijndael->encrypt($plaintext)); * ?> * * * LICENSE: This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA * * @category Crypt * @package Crypt_Rijndael * @author Jim Wigginton * @copyright MMVIII Jim Wigginton * @license http://www.gnu.org/licenses/lgpl.txt * @version $Id: Rijndael.php,v 1.12 2010/02/09 06:10:26 terrafrost Exp $ * @link http://phpseclib.sourceforge.net */ /**#@+ * @access public * @see Crypt_Rijndael::encrypt() * @see Crypt_Rijndael::decrypt() */ /** * Encrypt / decrypt using the Counter mode. * * Set to -1 since that's what Crypt/Random.php uses to index the CTR mode. * * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Counter_.28CTR.29 */ define('CRYPT_RIJNDAEL_MODE_CTR', -1); /** * Encrypt / decrypt using the Electronic Code Book mode. * * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Electronic_codebook_.28ECB.29 */ define('CRYPT_RIJNDAEL_MODE_ECB', 1); /** * Encrypt / decrypt using the Code Book Chaining mode. * * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher-block_chaining_.28CBC.29 */ define('CRYPT_RIJNDAEL_MODE_CBC', 2); /**#@-*/ /**#@+ * @access private * @see Crypt_Rijndael::Crypt_Rijndael() */ /** * Toggles the internal implementation */ define('CRYPT_RIJNDAEL_MODE_INTERNAL', 1); /** * Toggles the mcrypt implementation */ define('CRYPT_RIJNDAEL_MODE_MCRYPT', 2); /**#@-*/ /** * Pure-PHP implementation of Rijndael. * * @author Jim Wigginton * @version 0.1.0 * @access public * @package Crypt_Rijndael */ class Crypt_Rijndael { /** * The Encryption Mode * * @see Crypt_Rijndael::Crypt_Rijndael() * @var Integer * @access private */ var $mode; /** * The Key * * @see Crypt_Rijndael::setKey() * @var String * @access private */ var $key = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"; /** * The Initialization Vector * * @see Crypt_Rijndael::setIV() * @var String * @access private */ var $iv = ''; /** * A "sliding" Initialization Vector * * @see Crypt_Rijndael::enableContinuousBuffer() * @var String * @access private */ var $encryptIV = ''; /** * A "sliding" Initialization Vector * * @see Crypt_Rijndael::enableContinuousBuffer() * @var String * @access private */ var $decryptIV = ''; /** * Continuous Buffer status * * @see Crypt_Rijndael::enableContinuousBuffer() * @var Boolean * @access private */ var $continuousBuffer = false; /** * Padding status * * @see Crypt_Rijndael::enablePadding() * @var Boolean * @access private */ var $padding = true; /** * Does the key schedule need to be (re)calculated? * * @see setKey() * @see setBlockLength() * @see setKeyLength() * @var Boolean * @access private */ var $changed = true; /** * Has the key length explicitly been set or should it be derived from the key, itself? * * @see setKeyLength() * @var Boolean * @access private */ var $explicit_key_length = false; /** * The Key Schedule * * @see _setup() * @var Array * @access private */ var $w; /** * The Inverse Key Schedule * * @see _setup() * @var Array * @access private */ var $dw; /** * The Block Length * * @see setBlockLength() * @var Integer * @access private * @internal The max value is 32, the min value is 16. All valid values are multiples of 4. Exists in conjunction with * $Nb because we need this value and not $Nb to pad strings appropriately. */ var $block_size = 16; /** * The Block Length divided by 32 * * @see setBlockLength() * @var Integer * @access private * @internal The max value is 256 / 32 = 8, the min value is 128 / 32 = 4. Exists in conjunction with $block_size * because the encryption / decryption / key schedule creation requires this number and not $block_size. We could * derive this from $block_size or vice versa, but that'd mean we'd have to do multiple shift operations, so in lieu * of that, we'll just precompute it once. * */ var $Nb = 4; /** * The Key Length * * @see setKeyLength() * @var Integer * @access private * @internal The max value is 256 / 8 = 32, the min value is 128 / 8 = 16. Exists in conjunction with $key_size * because the encryption / decryption / key schedule creation requires this number and not $key_size. We could * derive this from $key_size or vice versa, but that'd mean we'd have to do multiple shift operations, so in lieu * of that, we'll just precompute it once. */ var $key_size = 16; /** * The Key Length divided by 32 * * @see setKeyLength() * @var Integer * @access private * @internal The max value is 256 / 32 = 8, the min value is 128 / 32 = 4 */ var $Nk = 4; /** * The Number of Rounds * * @var Integer * @access private * @internal The max value is 14, the min value is 10. */ var $Nr; /** * Shift offsets * * @var Array * @access private */ var $c; /** * Precomputed mixColumns table * * @see Crypt_Rijndael() * @var Array * @access private */ var $t0; /** * Precomputed mixColumns table * * @see Crypt_Rijndael() * @var Array * @access private */ var $t1; /** * Precomputed mixColumns table * * @see Crypt_Rijndael() * @var Array * @access private */ var $t2; /** * Precomputed mixColumns table * * @see Crypt_Rijndael() * @var Array * @access private */ var $t3; /** * Precomputed invMixColumns table * * @see Crypt_Rijndael() * @var Array * @access private */ var $dt0; /** * Precomputed invMixColumns table * * @see Crypt_Rijndael() * @var Array * @access private */ var $dt1; /** * Precomputed invMixColumns table * * @see Crypt_Rijndael() * @var Array * @access private */ var $dt2; /** * Precomputed invMixColumns table * * @see Crypt_Rijndael() * @var Array * @access private */ var $dt3; /** * Default Constructor. * * Determines whether or not the mcrypt extension should be used. $mode should only, at present, be * CRYPT_RIJNDAEL_MODE_ECB or CRYPT_RIJNDAEL_MODE_CBC. If not explictly set, CRYPT_RIJNDAEL_MODE_CBC will be used. * * @param optional Integer $mode * @return Crypt_Rijndael * @access public */ function Crypt_Rijndael($mode = CRYPT_RIJNDAEL_MODE_CBC) { switch ($mode) { case CRYPT_RIJNDAEL_MODE_ECB: case CRYPT_RIJNDAEL_MODE_CBC: case CRYPT_RIJNDAEL_MODE_CTR: $this->mode = $mode; break; default: $this->mode = CRYPT_RIJNDAEL_MODE_CBC; } $t3 = &$this->t3; $t2 = &$this->t2; $t1 = &$this->t1; $t0 = &$this->t0; $dt3 = &$this->dt3; $dt2 = &$this->dt2; $dt1 = &$this->dt1; $dt0 = &$this->dt0; // according to (section 5.2.1), // precomputed tables can be used in the mixColumns phase. in that example, they're assigned t0...t3, so // those are the names we'll use. $t3 = array( 0x6363A5C6, 0x7C7C84F8, 0x777799EE, 0x7B7B8DF6, 0xF2F20DFF, 0x6B6BBDD6, 0x6F6FB1DE, 0xC5C55491, 0x30305060, 0x01010302, 0x6767A9CE, 0x2B2B7D56, 0xFEFE19E7, 0xD7D762B5, 0xABABE64D, 0x76769AEC, 0xCACA458F, 0x82829D1F, 0xC9C94089, 0x7D7D87FA, 0xFAFA15EF, 0x5959EBB2, 0x4747C98E, 0xF0F00BFB, 0xADADEC41, 0xD4D467B3, 0xA2A2FD5F, 0xAFAFEA45, 0x9C9CBF23, 0xA4A4F753, 0x727296E4, 0xC0C05B9B, 0xB7B7C275, 0xFDFD1CE1, 0x9393AE3D, 0x26266A4C, 0x36365A6C, 0x3F3F417E, 0xF7F702F5, 0xCCCC4F83, 0x34345C68, 0xA5A5F451, 0xE5E534D1, 0xF1F108F9, 0x717193E2, 0xD8D873AB, 0x31315362, 0x15153F2A, 0x04040C08, 0xC7C75295, 0x23236546, 0xC3C35E9D, 0x18182830, 0x9696A137, 0x05050F0A, 0x9A9AB52F, 0x0707090E, 0x12123624, 0x80809B1B, 0xE2E23DDF, 0xEBEB26CD, 0x2727694E, 0xB2B2CD7F, 0x75759FEA, 0x09091B12, 0x83839E1D, 0x2C2C7458, 0x1A1A2E34, 0x1B1B2D36, 0x6E6EB2DC, 0x5A5AEEB4, 0xA0A0FB5B, 0x5252F6A4, 0x3B3B4D76, 0xD6D661B7, 0xB3B3CE7D, 0x29297B52, 0xE3E33EDD, 0x2F2F715E, 0x84849713, 0x5353F5A6, 0xD1D168B9, 0x00000000, 0xEDED2CC1, 0x20206040, 0xFCFC1FE3, 0xB1B1C879, 0x5B5BEDB6, 0x6A6ABED4, 0xCBCB468D, 0xBEBED967, 0x39394B72, 0x4A4ADE94, 0x4C4CD498, 0x5858E8B0, 0xCFCF4A85, 0xD0D06BBB, 0xEFEF2AC5, 0xAAAAE54F, 0xFBFB16ED, 0x4343C586, 0x4D4DD79A, 0x33335566, 0x85859411, 0x4545CF8A, 0xF9F910E9, 0x02020604, 0x7F7F81FE, 0x5050F0A0, 0x3C3C4478, 0x9F9FBA25, 0xA8A8E34B, 0x5151F3A2, 0xA3A3FE5D, 0x4040C080, 0x8F8F8A05, 0x9292AD3F, 0x9D9DBC21, 0x38384870, 0xF5F504F1, 0xBCBCDF63, 0xB6B6C177, 0xDADA75AF, 0x21216342, 0x10103020, 0xFFFF1AE5, 0xF3F30EFD, 0xD2D26DBF, 0xCDCD4C81, 0x0C0C1418, 0x13133526, 0xECEC2FC3, 0x5F5FE1BE, 0x9797A235, 0x4444CC88, 0x1717392E, 0xC4C45793, 0xA7A7F255, 0x7E7E82FC, 0x3D3D477A, 0x6464ACC8, 0x5D5DE7BA, 0x19192B32, 0x737395E6, 0x6060A0C0, 0x81819819, 0x4F4FD19E, 0xDCDC7FA3, 0x22226644, 0x2A2A7E54, 0x9090AB3B, 0x8888830B, 0x4646CA8C, 0xEEEE29C7, 0xB8B8D36B, 0x14143C28, 0xDEDE79A7, 0x5E5EE2BC, 0x0B0B1D16, 0xDBDB76AD, 0xE0E03BDB, 0x32325664, 0x3A3A4E74, 0x0A0A1E14, 0x4949DB92, 0x06060A0C, 0x24246C48, 0x5C5CE4B8, 0xC2C25D9F, 0xD3D36EBD, 0xACACEF43, 0x6262A6C4, 0x9191A839, 0x9595A431, 0xE4E437D3, 0x79798BF2, 0xE7E732D5, 0xC8C8438B, 0x3737596E, 0x6D6DB7DA, 0x8D8D8C01, 0xD5D564B1, 0x4E4ED29C, 0xA9A9E049, 0x6C6CB4D8, 0x5656FAAC, 0xF4F407F3, 0xEAEA25CF, 0x6565AFCA, 0x7A7A8EF4, 0xAEAEE947, 0x08081810, 0xBABAD56F, 0x787888F0, 0x25256F4A, 0x2E2E725C, 0x1C1C2438, 0xA6A6F157, 0xB4B4C773, 0xC6C65197, 0xE8E823CB, 0xDDDD7CA1, 0x74749CE8, 0x1F1F213E, 0x4B4BDD96, 0xBDBDDC61, 0x8B8B860D, 0x8A8A850F, 0x707090E0, 0x3E3E427C, 0xB5B5C471, 0x6666AACC, 0x4848D890, 0x03030506, 0xF6F601F7, 0x0E0E121C, 0x6161A3C2, 0x35355F6A, 0x5757F9AE, 0xB9B9D069, 0x86869117, 0xC1C15899, 0x1D1D273A, 0x9E9EB927, 0xE1E138D9, 0xF8F813EB, 0x9898B32B, 0x11113322, 0x6969BBD2, 0xD9D970A9, 0x8E8E8907, 0x9494A733, 0x9B9BB62D, 0x1E1E223C, 0x87879215, 0xE9E920C9, 0xCECE4987, 0x5555FFAA, 0x28287850, 0xDFDF7AA5, 0x8C8C8F03, 0xA1A1F859, 0x89898009, 0x0D0D171A, 0xBFBFDA65, 0xE6E631D7, 0x4242C684, 0x6868B8D0, 0x4141C382, 0x9999B029, 0x2D2D775A, 0x0F0F111E, 0xB0B0CB7B, 0x5454FCA8, 0xBBBBD66D, 0x16163A2C ); $dt3 = array( 0xF4A75051, 0x4165537E, 0x17A4C31A, 0x275E963A, 0xAB6BCB3B, 0x9D45F11F, 0xFA58ABAC, 0xE303934B, 0x30FA5520, 0x766DF6AD, 0xCC769188, 0x024C25F5, 0xE5D7FC4F, 0x2ACBD7C5, 0x35448026, 0x62A38FB5, 0xB15A49DE, 0xBA1B6725, 0xEA0E9845, 0xFEC0E15D, 0x2F7502C3, 0x4CF01281, 0x4697A38D, 0xD3F9C66B, 0x8F5FE703, 0x929C9515, 0x6D7AEBBF, 0x5259DA95, 0xBE832DD4, 0x7421D358, 0xE0692949, 0xC9C8448E, 0xC2896A75, 0x8E7978F4, 0x583E6B99, 0xB971DD27, 0xE14FB6BE, 0x88AD17F0, 0x20AC66C9, 0xCE3AB47D, 0xDF4A1863, 0x1A3182E5, 0x51336097, 0x537F4562, 0x6477E0B1, 0x6BAE84BB, 0x81A01CFE, 0x082B94F9, 0x48685870, 0x45FD198F, 0xDE6C8794, 0x7BF8B752, 0x73D323AB, 0x4B02E272, 0x1F8F57E3, 0x55AB2A66, 0xEB2807B2, 0xB5C2032F, 0xC57B9A86, 0x3708A5D3, 0x2887F230, 0xBFA5B223, 0x036ABA02, 0x16825CED, 0xCF1C2B8A, 0x79B492A7, 0x07F2F0F3, 0x69E2A14E, 0xDAF4CD65, 0x05BED506, 0x34621FD1, 0xA6FE8AC4, 0x2E539D34, 0xF355A0A2, 0x8AE13205, 0xF6EB75A4, 0x83EC390B, 0x60EFAA40, 0x719F065E, 0x6E1051BD, 0x218AF93E, 0xDD063D96, 0x3E05AEDD, 0xE6BD464D, 0x548DB591, 0xC45D0571, 0x06D46F04, 0x5015FF60, 0x98FB2419, 0xBDE997D6, 0x4043CC89, 0xD99E7767, 0xE842BDB0, 0x898B8807, 0x195B38E7, 0xC8EEDB79, 0x7C0A47A1, 0x420FE97C, 0x841EC9F8, 0x00000000, 0x80868309, 0x2BED4832, 0x1170AC1E, 0x5A724E6C, 0x0EFFFBFD, 0x8538560F, 0xAED51E3D, 0x2D392736, 0x0FD9640A, 0x5CA62168, 0x5B54D19B, 0x362E3A24, 0x0A67B10C, 0x57E70F93, 0xEE96D2B4, 0x9B919E1B, 0xC0C54F80, 0xDC20A261, 0x774B695A, 0x121A161C, 0x93BA0AE2, 0xA02AE5C0, 0x22E0433C, 0x1B171D12, 0x090D0B0E, 0x8BC7ADF2, 0xB6A8B92D, 0x1EA9C814, 0xF1198557, 0x75074CAF, 0x99DDBBEE, 0x7F60FDA3, 0x01269FF7, 0x72F5BC5C, 0x663BC544, 0xFB7E345B, 0x4329768B, 0x23C6DCCB, 0xEDFC68B6, 0xE4F163B8, 0x31DCCAD7, 0x63851042, 0x97224013, 0xC6112084, 0x4A247D85, 0xBB3DF8D2, 0xF93211AE, 0x29A16DC7, 0x9E2F4B1D, 0xB230F3DC, 0x8652EC0D, 0xC1E3D077, 0xB3166C2B, 0x70B999A9, 0x9448FA11, 0xE9642247, 0xFC8CC4A8, 0xF03F1AA0, 0x7D2CD856, 0x3390EF22, 0x494EC787, 0x38D1C1D9, 0xCAA2FE8C, 0xD40B3698, 0xF581CFA6, 0x7ADE28A5, 0xB78E26DA, 0xADBFA43F, 0x3A9DE42C, 0x78920D50, 0x5FCC9B6A, 0x7E466254, 0x8D13C2F6, 0xD8B8E890, 0x39F75E2E, 0xC3AFF582, 0x5D80BE9F, 0xD0937C69, 0xD52DA96F, 0x2512B3CF, 0xAC993BC8, 0x187DA710, 0x9C636EE8, 0x3BBB7BDB, 0x267809CD, 0x5918F46E, 0x9AB701EC, 0x4F9AA883, 0x956E65E6, 0xFFE67EAA, 0xBCCF0821, 0x15E8E6EF, 0xE79BD9BA, 0x6F36CE4A, 0x9F09D4EA, 0xB07CD629, 0xA4B2AF31, 0x3F23312A, 0xA59430C6, 0xA266C035, 0x4EBC3774, 0x82CAA6FC, 0x90D0B0E0, 0xA7D81533, 0x04984AF1, 0xECDAF741, 0xCD500E7F, 0x91F62F17, 0x4DD68D76, 0xEFB04D43, 0xAA4D54CC, 0x9604DFE4, 0xD1B5E39E, 0x6A881B4C, 0x2C1FB8C1, 0x65517F46, 0x5EEA049D, 0x8C355D01, 0x877473FA, 0x0B412EFB, 0x671D5AB3, 0xDBD25292, 0x105633E9, 0xD647136D, 0xD7618C9A, 0xA10C7A37, 0xF8148E59, 0x133C89EB, 0xA927EECE, 0x61C935B7, 0x1CE5EDE1, 0x47B13C7A, 0xD2DF599C, 0xF2733F55, 0x14CE7918, 0xC737BF73, 0xF7CDEA53, 0xFDAA5B5F, 0x3D6F14DF, 0x44DB8678, 0xAFF381CA, 0x68C43EB9, 0x24342C38, 0xA3405FC2, 0x1DC37216, 0xE2250CBC, 0x3C498B28, 0x0D9541FF, 0xA8017139, 0x0CB3DE08, 0xB4E49CD8, 0x56C19064, 0xCB84617B, 0x32B670D5, 0x6C5C7448, 0xB85742D0 ); for ($i = 0; $i < 256; $i++) { $t2[$i << 8] = (($t3[$i] << 8) & 0xFFFFFF00) | (($t3[$i] >> 24) & 0x000000FF); $t1[$i << 16] = (($t3[$i] << 16) & 0xFFFF0000) | (($t3[$i] >> 16) & 0x0000FFFF); $t0[$i << 24] = (($t3[$i] << 24) & 0xFF000000) | (($t3[$i] >> 8) & 0x00FFFFFF); $dt2[$i << 8] = (($this->dt3[$i] << 8) & 0xFFFFFF00) | (($dt3[$i] >> 24) & 0x000000FF); $dt1[$i << 16] = (($this->dt3[$i] << 16) & 0xFFFF0000) | (($dt3[$i] >> 16) & 0x0000FFFF); $dt0[$i << 24] = (($this->dt3[$i] << 24) & 0xFF000000) | (($dt3[$i] >> 8) & 0x00FFFFFF); } } /** * Sets the key. * * Keys can be of any length. Rijndael, itself, requires the use of a key that's between 128-bits and 256-bits long and * whose length is a multiple of 32. If the key is less than 256-bits and the key length isn't set, we round the length * up to the closest valid key length, padding $key with null bytes. If the key is more than 256-bits, we trim the * excess bits. * * If the key is not explicitly set, it'll be assumed to be all null bytes. * * @access public * @param String $key */ function setKey($key) { $this->key = $key; $this->changed = true; } /** * Sets the initialization vector. (optional) * * SetIV is not required when CRYPT_RIJNDAEL_MODE_ECB is being used. If not explictly set, it'll be assumed * to be all zero's. * * @access public * @param String $iv */ function setIV($iv) { $this->encryptIV = $this->decryptIV = $this->iv = str_pad(substr($iv, 0, $this->block_size), $this->block_size, chr(0));; } /** * Sets the key length * * Valid key lengths are 128, 160, 192, 224, and 256. If the length is less than 128, it will be rounded up to * 128. If the length is greater then 128 and invalid, it will be rounded down to the closest valid amount. * * @access public * @param Integer $length */ function setKeyLength($length) { $length >>= 5; if ($length > 8) { $length = 8; } else if ($length < 4) { $length = 4; } $this->Nk = $length; $this->key_size = $length << 2; $this->explicit_key_length = true; $this->changed = true; } /** * Sets the block length * * Valid block lengths are 128, 160, 192, 224, and 256. If the length is less than 128, it will be rounded up to * 128. If the length is greater then 128 and invalid, it will be rounded down to the closest valid amount. * * @access public * @param Integer $length */ function setBlockLength($length) { $length >>= 5; if ($length > 8) { $length = 8; } else if ($length < 4) { $length = 4; } $this->Nb = $length; $this->block_size = $length << 2; $this->changed = true; } /** * Generate CTR XOR encryption key * * Encrypt the output of this and XOR it against the ciphertext / plaintext to get the * plaintext / ciphertext in CTR mode. * * @see Crypt_Rijndael::decrypt() * @see Crypt_Rijndael::encrypt() * @access public * @param Integer $length * @param String $iv */ function _generate_xor($length, &$iv) { $xor = ''; $block_size = $this->block_size; $num_blocks = floor(($length + ($block_size - 1)) / $block_size); for ($i = 0; $i < $num_blocks; $i++) { $xor.= $iv; for ($j = 4; $j <= $block_size; $j+=4) { $temp = substr($iv, -$j, 4); switch ($temp) { case "\xFF\xFF\xFF\xFF": $iv = substr_replace($iv, "\x00\x00\x00\x00", -$j, 4); break; case "\x7F\xFF\xFF\xFF": $iv = substr_replace($iv, "\x80\x00\x00\x00", -$j, 4); break 2; default: extract(unpack('Ncount', $temp)); $iv = substr_replace($iv, pack('N', $count + 1), -$j, 4); break 2; } } } return $xor; } /** * Encrypts a message. * * $plaintext will be padded with additional bytes such that it's length is a multiple of the block size. Other Rjindael * implementations may or may not pad in the same manner. Other common approaches to padding and the reasons why it's * necessary are discussed in the following * URL: * * {@link http://www.di-mgt.com.au/cryptopad.html http://www.di-mgt.com.au/cryptopad.html} * * An alternative to padding is to, separately, send the length of the file. This is what SSH, in fact, does. * strlen($plaintext) will still need to be a multiple of 8, however, arbitrary values can be added to make it that * length. * * @see Crypt_Rijndael::decrypt() * @access public * @param String $plaintext */ function encrypt($plaintext) { $this->_setup(); if ($this->mode != CRYPT_RIJNDAEL_MODE_CTR) { $plaintext = $this->_pad($plaintext); } $block_size = $this->block_size; $ciphertext = ''; switch ($this->mode) { case CRYPT_RIJNDAEL_MODE_ECB: for ($i = 0; $i < strlen($plaintext); $i+=$block_size) { $ciphertext.= $this->_encryptBlock(substr($plaintext, $i, $block_size)); } break; case CRYPT_RIJNDAEL_MODE_CBC: $xor = $this->encryptIV; for ($i = 0; $i < strlen($plaintext); $i+=$block_size) { $block = substr($plaintext, $i, $block_size); $block = $this->_encryptBlock($block ^ $xor); $xor = $block; $ciphertext.= $block; } if ($this->continuousBuffer) { $this->encryptIV = $xor; } break; case CRYPT_RIJNDAEL_MODE_CTR: $xor = $this->encryptIV; for ($i = 0; $i < strlen($plaintext); $i+=$block_size) { $block = substr($plaintext, $i, $block_size); $key = $this->_encryptBlock($this->_generate_xor($block_size, $xor)); $ciphertext.= $block ^ $key; } if ($this->continuousBuffer) { $this->encryptIV = $xor; } } return $ciphertext; } /** * Decrypts a message. * * If strlen($ciphertext) is not a multiple of the block size, null bytes will be added to the end of the string until * it is. * * @see Crypt_Rijndael::encrypt() * @access public * @param String $ciphertext */ function decrypt($ciphertext) { $this->_setup(); if ($this->mode != CRYPT_RIJNDAEL_MODE_CTR) { // we pad with chr(0) since that's what mcrypt_generic does. to quote from http://php.net/function.mcrypt-generic : // "The data is padded with "\0" to make sure the length of the data is n * blocksize." $ciphertext = str_pad($ciphertext, (strlen($ciphertext) + $this->block_size - 1) % $this->block_size, chr(0)); } $block_size = $this->block_size; $plaintext = ''; switch ($this->mode) { case CRYPT_RIJNDAEL_MODE_ECB: for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) { $plaintext.= $this->_decryptBlock(substr($ciphertext, $i, $block_size)); } break; case CRYPT_RIJNDAEL_MODE_CBC: $xor = $this->decryptIV; for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) { $block = substr($ciphertext, $i, $block_size); $plaintext.= $this->_decryptBlock($block) ^ $xor; $xor = $block; } if ($this->continuousBuffer) { $this->decryptIV = $xor; } break; case CRYPT_RIJNDAEL_MODE_CTR: $xor = $this->decryptIV; for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) { $block = substr($ciphertext, $i, $block_size); $key = $this->_encryptBlock($this->_generate_xor($block_size, $xor)); $plaintext.= $block ^ $key; } if ($this->continuousBuffer) { $this->decryptIV = $xor; } } return $this->mode != CRYPT_RIJNDAEL_MODE_CTR ? $this->_unpad($plaintext) : $plaintext; } /** * Encrypts a block * * @access private * @param String $in * @return String */ function _encryptBlock($in) { $state = array(); $words = unpack('N*word', $in); $w = $this->w; $t0 = $this->t0; $t1 = $this->t1; $t2 = $this->t2; $t3 = $this->t3; $Nb = $this->Nb; $Nr = $this->Nr; $c = $this->c; // addRoundKey $i = 0; foreach ($words as $word) { $state[] = $word ^ $w[0][$i++]; } // fips-197.pdf#page=19, "Figure 5. Pseudo Code for the Cipher", states that this loop has four components - // subBytes, shiftRows, mixColumns, and addRoundKey. fips-197.pdf#page=30, "Implementation Suggestions Regarding // Various Platforms" suggests that performs enhanced implementations are described in Rijndael-ammended.pdf. // Rijndael-ammended.pdf#page=20, "Implementation aspects / 32-bit processor", discusses such an optimization. // Unfortunately, the description given there is not quite correct. Per aes.spec.v316.pdf#page=19 [1], // equation (7.4.7) is supposed to use addition instead of subtraction, so we'll do that here, as well. // [1] http://fp.gladman.plus.com/cryptography_technology/rijndael/aes.spec.v316.pdf $temp = array(); for ($round = 1; $round < $Nr; $round++) { $i = 0; // $c[0] == 0 $j = $c[1]; $k = $c[2]; $l = $c[3]; while ($i < $this->Nb) { $temp[$i] = $t0[$state[$i] & 0xFF000000] ^ $t1[$state[$j] & 0x00FF0000] ^ $t2[$state[$k] & 0x0000FF00] ^ $t3[$state[$l] & 0x000000FF] ^ $w[$round][$i]; $i++; $j = ($j + 1) % $Nb; $k = ($k + 1) % $Nb; $l = ($l + 1) % $Nb; } for ($i = 0; $i < $Nb; $i++) { $state[$i] = $temp[$i]; } } // subWord for ($i = 0; $i < $Nb; $i++) { $state[$i] = $this->_subWord($state[$i]); } // shiftRows + addRoundKey $i = 0; // $c[0] == 0 $j = $c[1]; $k = $c[2]; $l = $c[3]; while ($i < $this->Nb) { $temp[$i] = ($state[$i] & 0xFF000000) ^ ($state[$j] & 0x00FF0000) ^ ($state[$k] & 0x0000FF00) ^ ($state[$l] & 0x000000FF) ^ $w[$Nr][$i]; $i++; $j = ($j + 1) % $Nb; $k = ($k + 1) % $Nb; $l = ($l + 1) % $Nb; } $state = $temp; array_unshift($state, 'N*'); return call_user_func_array('pack', $state); } /** * Decrypts a block * * @access private * @param String $in * @return String */ function _decryptBlock($in) { $state = array(); $words = unpack('N*word', $in); $num_states = count($state); $dw = $this->dw; $dt0 = $this->dt0; $dt1 = $this->dt1; $dt2 = $this->dt2; $dt3 = $this->dt3; $Nb = $this->Nb; $Nr = $this->Nr; $c = $this->c; // addRoundKey $i = 0; foreach ($words as $word) { $state[] = $word ^ $dw[$Nr][$i++]; } $temp = array(); for ($round = $Nr - 1; $round > 0; $round--) { $i = 0; // $c[0] == 0 $j = $Nb - $c[1]; $k = $Nb - $c[2]; $l = $Nb - $c[3]; while ($i < $Nb) { $temp[$i] = $dt0[$state[$i] & 0xFF000000] ^ $dt1[$state[$j] & 0x00FF0000] ^ $dt2[$state[$k] & 0x0000FF00] ^ $dt3[$state[$l] & 0x000000FF] ^ $dw[$round][$i]; $i++; $j = ($j + 1) % $Nb; $k = ($k + 1) % $Nb; $l = ($l + 1) % $Nb; } for ($i = 0; $i < $Nb; $i++) { $state[$i] = $temp[$i]; } } // invShiftRows + invSubWord + addRoundKey $i = 0; // $c[0] == 0 $j = $Nb - $c[1]; $k = $Nb - $c[2]; $l = $Nb - $c[3]; while ($i < $Nb) { $temp[$i] = $dw[0][$i] ^ $this->_invSubWord(($state[$i] & 0xFF000000) | ($state[$j] & 0x00FF0000) | ($state[$k] & 0x0000FF00) | ($state[$l] & 0x000000FF)); $i++; $j = ($j + 1) % $Nb; $k = ($k + 1) % $Nb; $l = ($l + 1) % $Nb; } $state = $temp; array_unshift($state, 'N*'); return call_user_func_array('pack', $state); } /** * Setup Rijndael * * Validates all the variables and calculates $Nr - the number of rounds that need to be performed - and $w - the key * key schedule. * * @access private */ function _setup() { // Each number in $rcon is equal to the previous number multiplied by two in Rijndael's finite field. // See http://en.wikipedia.org/wiki/Finite_field_arithmetic#Multiplicative_inverse static $rcon = array(0, 0x01000000, 0x02000000, 0x04000000, 0x08000000, 0x10000000, 0x20000000, 0x40000000, 0x80000000, 0x1B000000, 0x36000000, 0x6C000000, 0xD8000000, 0xAB000000, 0x4D000000, 0x9A000000, 0x2F000000, 0x5E000000, 0xBC000000, 0x63000000, 0xC6000000, 0x97000000, 0x35000000, 0x6A000000, 0xD4000000, 0xB3000000, 0x7D000000, 0xFA000000, 0xEF000000, 0xC5000000, 0x91000000 ); if (!$this->changed) { return; } if (!$this->explicit_key_length) { // we do >> 2, here, and not >> 5, as we do above, since strlen($this->key) tells us the number of bytes - not bits $length = strlen($this->key) >> 2; if ($length > 8) { $length = 8; } else if ($length < 4) { $length = 4; } $this->Nk = $length; $this->key_size = $length << 2; } $this->key = str_pad(substr($this->key, 0, $this->key_size), $this->key_size, chr(0)); $this->encryptIV = $this->decryptIV = $this->iv = str_pad(substr($this->iv, 0, $this->block_size), $this->block_size, chr(0)); // see Rijndael-ammended.pdf#page=44 $this->Nr = max($this->Nk, $this->Nb) + 6; // shift offsets for Nb = 5, 7 are defined in Rijndael-ammended.pdf#page=44, // "Table 8: Shift offsets in Shiftrow for the alternative block lengths" // shift offsets for Nb = 4, 6, 8 are defined in Rijndael-ammended.pdf#page=14, // "Table 2: Shift offsets for different block lengths" switch ($this->Nb) { case 4: case 5: case 6: $this->c = array(0, 1, 2, 3); break; case 7: $this->c = array(0, 1, 2, 4); break; case 8: $this->c = array(0, 1, 3, 4); } $key = $this->key; $w = array_values(unpack('N*words', $key)); $length = $this->Nb * ($this->Nr + 1); for ($i = $this->Nk; $i < $length; $i++) { $temp = $w[$i - 1]; if ($i % $this->Nk == 0) { // according to , "the size of an integer is platform-dependent". // on a 32-bit machine, it's 32-bits, and on a 64-bit machine, it's 64-bits. on a 32-bit machine, // 0xFFFFFFFF << 8 == 0xFFFFFF00, but on a 64-bit machine, it equals 0xFFFFFFFF00. as such, doing 'and' // with 0xFFFFFFFF (or 0xFFFFFF00) on a 32-bit machine is unnecessary, but on a 64-bit machine, it is. $temp = (($temp << 8) & 0xFFFFFF00) | (($temp >> 24) & 0x000000FF); // rotWord $temp = $this->_subWord($temp) ^ $rcon[$i / $this->Nk]; } else if ($this->Nk > 6 && $i % $this->Nk == 4) { $temp = $this->_subWord($temp); } $w[$i] = $w[$i - $this->Nk] ^ $temp; } // convert the key schedule from a vector of $Nb * ($Nr + 1) length to a matrix with $Nr + 1 rows and $Nb columns // and generate the inverse key schedule. more specifically, // according to (section 5.3.3), // "The key expansion for the Inverse Cipher is defined as follows: // 1. Apply the Key Expansion. // 2. Apply InvMixColumn to all Round Keys except the first and the last one." // also, see fips-197.pdf#page=27, "5.3.5 Equivalent Inverse Cipher" $temp = array(); for ($i = $row = $col = 0; $i < $length; $i++, $col++) { if ($col == $this->Nb) { if ($row == 0) { $this->dw[0] = $this->w[0]; } else { // subWord + invMixColumn + invSubWord = invMixColumn $j = 0; while ($j < $this->Nb) { $dw = $this->_subWord($this->w[$row][$j]); $temp[$j] = $this->dt0[$dw & 0xFF000000] ^ $this->dt1[$dw & 0x00FF0000] ^ $this->dt2[$dw & 0x0000FF00] ^ $this->dt3[$dw & 0x000000FF]; $j++; } $this->dw[$row] = $temp; } $col = 0; $row++; } $this->w[$row][$col] = $w[$i]; } $this->dw[$row] = $this->w[$row]; $this->changed = false; } /** * Performs S-Box substitutions * * @access private */ function _subWord($word) { static $sbox0, $sbox1, $sbox2, $sbox3; if (empty($sbox0)) { $sbox0 = array( 0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76, 0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0, 0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15, 0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75, 0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84, 0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF, 0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, 0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8, 0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2, 0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73, 0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB, 0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79, 0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08, 0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A, 0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E, 0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF, 0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16 ); $sbox1 = array(); $sbox2 = array(); $sbox3 = array(); for ($i = 0; $i < 256; $i++) { $sbox1[$i << 8] = $sbox0[$i] << 8; $sbox2[$i << 16] = $sbox0[$i] << 16; $sbox3[$i << 24] = $sbox0[$i] << 24; } } return $sbox0[$word & 0x000000FF] | $sbox1[$word & 0x0000FF00] | $sbox2[$word & 0x00FF0000] | $sbox3[$word & 0xFF000000]; } /** * Performs inverse S-Box substitutions * * @access private */ function _invSubWord($word) { static $sbox0, $sbox1, $sbox2, $sbox3; if (empty($sbox0)) { $sbox0 = array( 0x52, 0x09, 0x6A, 0xD5, 0x30, 0x36, 0xA5, 0x38, 0xBF, 0x40, 0xA3, 0x9E, 0x81, 0xF3, 0xD7, 0xFB, 0x7C, 0xE3, 0x39, 0x82, 0x9B, 0x2F, 0xFF, 0x87, 0x34, 0x8E, 0x43, 0x44, 0xC4, 0xDE, 0xE9, 0xCB, 0x54, 0x7B, 0x94, 0x32, 0xA6, 0xC2, 0x23, 0x3D, 0xEE, 0x4C, 0x95, 0x0B, 0x42, 0xFA, 0xC3, 0x4E, 0x08, 0x2E, 0xA1, 0x66, 0x28, 0xD9, 0x24, 0xB2, 0x76, 0x5B, 0xA2, 0x49, 0x6D, 0x8B, 0xD1, 0x25, 0x72, 0xF8, 0xF6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xD4, 0xA4, 0x5C, 0xCC, 0x5D, 0x65, 0xB6, 0x92, 0x6C, 0x70, 0x48, 0x50, 0xFD, 0xED, 0xB9, 0xDA, 0x5E, 0x15, 0x46, 0x57, 0xA7, 0x8D, 0x9D, 0x84, 0x90, 0xD8, 0xAB, 0x00, 0x8C, 0xBC, 0xD3, 0x0A, 0xF7, 0xE4, 0x58, 0x05, 0xB8, 0xB3, 0x45, 0x06, 0xD0, 0x2C, 0x1E, 0x8F, 0xCA, 0x3F, 0x0F, 0x02, 0xC1, 0xAF, 0xBD, 0x03, 0x01, 0x13, 0x8A, 0x6B, 0x3A, 0x91, 0x11, 0x41, 0x4F, 0x67, 0xDC, 0xEA, 0x97, 0xF2, 0xCF, 0xCE, 0xF0, 0xB4, 0xE6, 0x73, 0x96, 0xAC, 0x74, 0x22, 0xE7, 0xAD, 0x35, 0x85, 0xE2, 0xF9, 0x37, 0xE8, 0x1C, 0x75, 0xDF, 0x6E, 0x47, 0xF1, 0x1A, 0x71, 0x1D, 0x29, 0xC5, 0x89, 0x6F, 0xB7, 0x62, 0x0E, 0xAA, 0x18, 0xBE, 0x1B, 0xFC, 0x56, 0x3E, 0x4B, 0xC6, 0xD2, 0x79, 0x20, 0x9A, 0xDB, 0xC0, 0xFE, 0x78, 0xCD, 0x5A, 0xF4, 0x1F, 0xDD, 0xA8, 0x33, 0x88, 0x07, 0xC7, 0x31, 0xB1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xEC, 0x5F, 0x60, 0x51, 0x7F, 0xA9, 0x19, 0xB5, 0x4A, 0x0D, 0x2D, 0xE5, 0x7A, 0x9F, 0x93, 0xC9, 0x9C, 0xEF, 0xA0, 0xE0, 0x3B, 0x4D, 0xAE, 0x2A, 0xF5, 0xB0, 0xC8, 0xEB, 0xBB, 0x3C, 0x83, 0x53, 0x99, 0x61, 0x17, 0x2B, 0x04, 0x7E, 0xBA, 0x77, 0xD6, 0x26, 0xE1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0C, 0x7D ); $sbox1 = array(); $sbox2 = array(); $sbox3 = array(); for ($i = 0; $i < 256; $i++) { $sbox1[$i << 8] = $sbox0[$i] << 8; $sbox2[$i << 16] = $sbox0[$i] << 16; $sbox3[$i << 24] = $sbox0[$i] << 24; } } return $sbox0[$word & 0x000000FF] | $sbox1[$word & 0x0000FF00] | $sbox2[$word & 0x00FF0000] | $sbox3[$word & 0xFF000000]; } /** * Pad "packets". * * Rijndael works by encrypting between sixteen and thirty-two bytes at a time, provided that number is also a multiple * of four. If you ever need to encrypt or decrypt something that isn't of the proper length, it becomes necessary to * pad the input so that it is of the proper length. * * Padding is enabled by default. Sometimes, however, it is undesirable to pad strings. Such is the case in SSH, * where "packets" are padded with random bytes before being encrypted. Unpad these packets and you risk stripping * away characters that shouldn't be stripped away. (SSH knows how many bytes are added because the length is * transmitted separately) * * @see Crypt_Rijndael::disablePadding() * @access public */ function enablePadding() { $this->padding = true; } /** * Do not pad packets. * * @see Crypt_Rijndael::enablePadding() * @access public */ function disablePadding() { $this->padding = false; } /** * Pads a string * * Pads a string using the RSA PKCS padding standards so that its length is a multiple of the blocksize. * $block_size - (strlen($text) % $block_size) bytes are added, each of which is equal to * chr($block_size - (strlen($text) % $block_size) * * If padding is disabled and $text is not a multiple of the blocksize, the string will be padded regardless * and padding will, hence forth, be enabled. * * @see Crypt_Rijndael::_unpad() * @access private */ function _pad($text) { $length = strlen($text); if (!$this->padding) { if ($length % $this->block_size == 0) { return $text; } else { user_error("The plaintext's length ($length) is not a multiple of the block size ({$this->block_size})", E_USER_NOTICE); $this->padding = true; } } $pad = $this->block_size - ($length % $this->block_size); return str_pad($text, $length + $pad, chr($pad)); } /** * Unpads a string. * * If padding is enabled and the reported padding length is invalid the encryption key will be assumed to be wrong * and false will be returned. * * @see Crypt_Rijndael::_pad() * @access private */ function _unpad($text) { if (!$this->padding) { return $text; } $length = ord($text[strlen($text) - 1]); if (!$length || $length > $this->block_size) { return false; } return substr($text, 0, -$length); } /** * Treat consecutive "packets" as if they are a continuous buffer. * * Say you have a 32-byte plaintext $plaintext. Using the default behavior, the two following code snippets * will yield different outputs: * * * echo $rijndael->encrypt(substr($plaintext, 0, 16)); * echo $rijndael->encrypt(substr($plaintext, 16, 16)); * * * echo $rijndael->encrypt($plaintext); * * * The solution is to enable the continuous buffer. Although this will resolve the above discrepancy, it creates * another, as demonstrated with the following: * * * $rijndael->encrypt(substr($plaintext, 0, 16)); * echo $rijndael->decrypt($des->encrypt(substr($plaintext, 16, 16))); * * * echo $rijndael->decrypt($des->encrypt(substr($plaintext, 16, 16))); * * * With the continuous buffer disabled, these would yield the same output. With it enabled, they yield different * outputs. The reason is due to the fact that the initialization vector's change after every encryption / * decryption round when the continuous buffer is enabled. When it's disabled, they remain constant. * * Put another way, when the continuous buffer is enabled, the state of the Crypt_Rijndael() object changes after each * encryption / decryption round, whereas otherwise, it'd remain constant. For this reason, it's recommended that * continuous buffers not be used. They do offer better security and are, in fact, sometimes required (SSH uses them), * however, they are also less intuitive and more likely to cause you problems. * * @see Crypt_Rijndael::disableContinuousBuffer() * @access public */ function enableContinuousBuffer() { $this->continuousBuffer = true; } /** * Treat consecutive packets as if they are a discontinuous buffer. * * The default behavior. * * @see Crypt_Rijndael::enableContinuousBuffer() * @access public */ function disableContinuousBuffer() { $this->continuousBuffer = false; $this->encryptIV = $this->iv; $this->decryptIV = $this->iv; } /** * String Shift * * Inspired by array_shift * * @param String $string * @param optional Integer $index * @return String * @access private */ function _string_shift(&$string, $index = 1) { $substr = substr($string, 0, $index); $string = substr($string, $index); return $substr; } } // vim: ts=4:sw=4:et: // vim6: fdl=1: