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Split files and encode and decode Base64

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2016-07-25 09:01:431731browse
PHP分割文件并进行Base64编解码
  2. $orgFile = 'D:GdiPlus.dll';
  3. $cacheFileName = 'GdiPlus.dll';
  5. function splitFile($fileName,$block) {
  6. global $cacheFileName;
  7. if (!file_exists($fileName)) return false;
  8. $num = 1;
  9. $file = fopen($fileName, 'rb');
  10. while ($content = fread($file,$block)) {
  11. $cacheFile = $cacheFileName . '.part' . $num++ ;
  12. $cfile = fopen($cacheFile, 'wb');
  13. fwrite($cfile, base64_encode($content));
  14. fflush($cfile);
  15. fclose($cfile);
  16. }
  17. fclose($file);
  18. }
  20. function mergeFile($targetFile) {
  21. global $cacheFileName;
  22. $num = 1;
  23. $file = fopen($targetFile, 'wb');
  24. while ($num > 0) {
  25. $cacheFile = $cacheFileName . '.part' . $num++;
  26. if (file_exists($cacheFile)) {
  27. $cfile = fopen($cacheFile, 'rb');
  28. $content = fread($cfile, filesize($cacheFile));
  29. fclose($cfile);
  30. fwrite($file, base64_decode($content));
  31. fflush($file);
  32. } else {
  33. $num = -1;
  34. }
  35. }
  36. fclose($file);
  37. }
  39. splitFile($orgFile, pow(2,19));
  40. mergeFile('GdiPlus.dll');
  42. ?>
复制代码
  1. class Aes {
  3. /**
  4. * AES Cipher function: encrypt 'input' with Rijndael algorithm
  5. *
  6. * @param input message as byte-array (16 bytes)
  7. * @param w key schedule as 2D byte-array (Nr+1 x Nb bytes) -
  8. * generated from the cipher key by keyExpansion()
  9. * @return ciphertext as byte-array (16 bytes)
  10. */
  11. public static function cipher($input, $w) {
  12. // main cipher function [§5.1]
  13. $Nb = 4; // block size (in words): no of columns in state (fixed at 4 for AES)
  14. $Nr = count($w)/$Nb - 1; // no of rounds: 10/12/14 for 128/192/256-bit keys
  16. $state = array(); // initialise 4xNb byte-array 'state' with input [§3.4]
  17. for ($i=0; $i<4*$Nb; $i++) $state[$i%4][floor($i/4)] = $input[$i];
  19. $state = self::addRoundKey($state, $w, 0, $Nb);
  21. for ($round=1; $round<$Nr; $round++) { // apply Nr rounds
  22. $state = self::subBytes($state, $Nb);
  23. $state = self::shiftRows($state, $Nb);
  24. $state = self::mixColumns($state, $Nb);
  25. $state = self::addRoundKey($state, $w, $round, $Nb);
  26. }
  28. $state = self::subBytes($state, $Nb);
  29. $state = self::shiftRows($state, $Nb);
  30. $state = self::addRoundKey($state, $w, $Nr, $Nb);
  32. $output = array(4*$Nb); // convert state to 1-d array before returning [§3.4]
  33. for ($i=0; $i<4*$Nb; $i++) $output[$i] = $state[$i%4][floor($i/4)];
  34. return $output;
  35. }
  38. private static function addRoundKey($state, $w, $rnd, $Nb) { // xor Round Key into state S [§5.1.4]
  39. for ($r=0; $r<4; $r++) {
  40. for ($c=0; $c<$Nb; $c++) $state[$r][$c] ^= $w[$rnd*4+$c][$r];
  41. }
  42. return $state;
  43. }
  45. private static function subBytes($s, $Nb) { // apply SBox to state S [§5.1.1]
  46. for ($r=0; $r<4; $r++) {
  47. for ($c=0; $c<$Nb; $c++) $s[$r][$c] = self::$sBox[$s[$r][$c]];
  48. }
  49. return $s;
  50. }
  52. private static function shiftRows($s, $Nb) { // shift row r of state S left by r bytes [§5.1.2]
  53. $t = array(4);
  54. for ($r=1; $r<4; $r++) {
  55. for ($c=0; $c<4; $c++) $t[$c] = $s[$r][($c+$r)%$Nb]; // shift into temp copy
  56. for ($c=0; $c<4; $c++) $s[$r][$c] = $t[$c]; // and copy back
  57. } // note that this will work for Nb=4,5,6, but not 7,8 (always 4 for AES):
  58. return $s; // see fp.gladman.plus.com/cryptography_technology/rijndael/aes.spec.311.pdf
  59. }
  61. private static function mixColumns($s, $Nb) { // combine bytes of each col of state S [§5.1.3]
  62. for ($c=0; $c<4; $c++) {
  63. $a = array(4); // 'a' is a copy of the current column from 's'
  64. $b = array(4); // 'b' is a?{02} in GF(2^8)
  65. for ($i=0; $i<4; $i++) {
  66. $a[$i] = $s[$i][$c];
  67. $b[$i] = $s[$i][$c]&0x80 ? $s[$i][$c]<<1 ^ 0x011b : $s[$i][$c]<<1;
  68. }
  69. // a[n] ^ b[n] is a?{03} in GF(2^8)
  70. $s[0][$c] = $b[0] ^ $a[1] ^ $b[1] ^ $a[2] ^ $a[3]; // 2*a0 + 3*a1 + a2 + a3
  71. $s[1][$c] = $a[0] ^ $b[1] ^ $a[2] ^ $b[2] ^ $a[3]; // a0 * 2*a1 + 3*a2 + a3
  72. $s[2][$c] = $a[0] ^ $a[1] ^ $b[2] ^ $a[3] ^ $b[3]; // a0 + a1 + 2*a2 + 3*a3
  73. $s[3][$c] = $a[0] ^ $b[0] ^ $a[1] ^ $a[2] ^ $b[3]; // 3*a0 + a1 + a2 + 2*a3
  74. }
  75. return $s;
  76. }
  78. /**
  79. * Key expansion for Rijndael cipher(): performs key expansion on cipher key
  80. * to generate a key schedule
  81. *
  82. * @param key cipher key byte-array (16 bytes)
  83. * @return key schedule as 2D byte-array (Nr+1 x Nb bytes)
  84. */
  85. public static function keyExpansion($key) { // generate Key Schedule from Cipher Key [§5.2]
  86. $Nb = 4; // block size (in words): no of columns in state (fixed at 4 for AES)
  87. $Nk = count($key)/4; // key length (in words): 4/6/8 for 128/192/256-bit keys
  88. $Nr = $Nk + 6; // no of rounds: 10/12/14 for 128/192/256-bit keys
  90. $w = array();
  91. $temp = array();
  93. for ($i=0; $i<$Nk; $i++) {
  94. $r = array($key[4*$i], $key[4*$i+1], $key[4*$i+2], $key[4*$i+3]);
  95. $w[$i] = $r;
  96. }
  98. for ($i=$Nk; $i<($Nb*($Nr+1)); $i++) {
  99. $w[$i] = array();
  100. for ($t=0; $t<4; $t++) $temp[$t] = $w[$i-1][$t];
  101. if ($i % $Nk == 0) {
  102. $temp = self::subWord(self::rotWord($temp));
  103. for ($t=0; $t<4; $t++) $temp[$t] ^= self::$rCon[$i/$Nk][$t];
  104. } else if ($Nk > 6 && $i%$Nk == 4) {
  105. $temp = self::subWord($temp);
  106. }
  107. for ($t=0; $t<4; $t++) $w[$i][$t] = $w[$i-$Nk][$t] ^ $temp[$t];
  108. }
  109. return $w;
  110. }
  112. private static function subWord($w) { // apply SBox to 4-byte word w
  113. for ($i=0; $i<4; $i++) $w[$i] = self::$sBox[$w[$i]];
  114. return $w;
  115. }
  117. private static function rotWord($w) { // rotate 4-byte word w left by one byte
  118. $tmp = $w[0];
  119. for ($i=0; $i<3; $i++) $w[$i] = $w[$i+1];
  120. $w[3] = $tmp;
  121. return $w;
  122. }
  124. // sBox is pre-computed multiplicative inverse in GF(2^8) used in subBytes and keyExpansion [§5.1.1]
  125. private static $sBox = array(
  126. 0x63,0x7c,0x77,0x7b,0xf2,0x6b,0x6f,0xc5,0x30,0x01,0x67,0x2b,0xfe,0xd7,0xab,0x76,
  127. 0xca,0x82,0xc9,0x7d,0xfa,0x59,0x47,0xf0,0xad,0xd4,0xa2,0xaf,0x9c,0xa4,0x72,0xc0,
  128. 0xb7,0xfd,0x93,0x26,0x36,0x3f,0xf7,0xcc,0x34,0xa5,0xe5,0xf1,0x71,0xd8,0x31,0x15,
  129. 0x04,0xc7,0x23,0xc3,0x18,0x96,0x05,0x9a,0x07,0x12,0x80,0xe2,0xeb,0x27,0xb2,0x75,
  130. 0x09,0x83,0x2c,0x1a,0x1b,0x6e,0x5a,0xa0,0x52,0x3b,0xd6,0xb3,0x29,0xe3,0x2f,0x84,
  131. 0x53,0xd1,0x00,0xed,0x20,0xfc,0xb1,0x5b,0x6a,0xcb,0xbe,0x39,0x4a,0x4c,0x58,0xcf,
  132. 0xd0,0xef,0xaa,0xfb,0x43,0x4d,0x33,0x85,0x45,0xf9,0x02,0x7f,0x50,0x3c,0x9f,0xa8,
  133. 0x51,0xa3,0x40,0x8f,0x92,0x9d,0x38,0xf5,0xbc,0xb6,0xda,0x21,0x10,0xff,0xf3,0xd2,
  134. 0xcd,0x0c,0x13,0xec,0x5f,0x97,0x44,0x17,0xc4,0xa7,0x7e,0x3d,0x64,0x5d,0x19,0x73,
  135. 0x60,0x81,0x4f,0xdc,0x22,0x2a,0x90,0x88,0x46,0xee,0xb8,0x14,0xde,0x5e,0x0b,0xdb,
  136. 0xe0,0x32,0x3a,0x0a,0x49,0x06,0x24,0x5c,0xc2,0xd3,0xac,0x62,0x91,0x95,0xe4,0x79,
  137. 0xe7,0xc8,0x37,0x6d,0x8d,0xd5,0x4e,0xa9,0x6c,0x56,0xf4,0xea,0x65,0x7a,0xae,0x08,
  138. 0xba,0x78,0x25,0x2e,0x1c,0xa6,0xb4,0xc6,0xe8,0xdd,0x74,0x1f,0x4b,0xbd,0x8b,0x8a,
  139. 0x70,0x3e,0xb5,0x66,0x48,0x03,0xf6,0x0e,0x61,0x35,0x57,0xb9,0x86,0xc1,0x1d,0x9e,
  140. 0xe1,0xf8,0x98,0x11,0x69,0xd9,0x8e,0x94,0x9b,0x1e,0x87,0xe9,0xce,0x55,0x28,0xdf,
  141. 0x8c,0xa1,0x89,0x0d,0xbf,0xe6,0x42,0x68,0x41,0x99,0x2d,0x0f,0xb0,0x54,0xbb,0x16);
  143. // rCon is Round Constant used for the Key Expansion [1st col is 2^(r-1) in GF(2^8)] [§5.2]
  144. private static $rCon = array(
  145. array(0x00, 0x00, 0x00, 0x00),
  146. array(0x01, 0x00, 0x00, 0x00),
  147. array(0x02, 0x00, 0x00, 0x00),
  148. array(0x04, 0x00, 0x00, 0x00),
  149. array(0x08, 0x00, 0x00, 0x00),
  150. array(0x10, 0x00, 0x00, 0x00),
  151. array(0x20, 0x00, 0x00, 0x00),
  152. array(0x40, 0x00, 0x00, 0x00),
  153. array(0x80, 0x00, 0x00, 0x00),
  154. array(0x1b, 0x00, 0x00, 0x00),
  155. array(0x36, 0x00, 0x00, 0x00) );
  157. }
  159. /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
  160. /* AES counter (CTR) mode implementation in PHP (c) Chris Veness 2005-2011. Right of free use is */
  161. /* granted for all commercial or non-commercial use under CC-BY licence. No warranty of any */
  162. /* form is offered. */
  163. /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
  165. class AesCtr extends Aes {
  167. /**
  168. * Encrypt a text using AES encryption in Counter mode of operation
  169. * - see http://csrc.nist.gov/publications/nistpubs/800-38a/sp800-38a.pdf
  170. *
  171. * Unicode multi-byte character safe
  172. *
  173. * @param plaintext source text to be encrypted
  174. * @param password the password to use to generate a key
  175. * @param nBits number of bits to be used in the key (128, 192, or 256)
  176. * @return encrypted text
  177. */
  178. public static function encrypt($plaintext, $password, $nBits) {
  179. $blockSize = 16; // block size fixed at 16 bytes / 128 bits (Nb=4) for AES
  180. if (!($nBits==128 || $nBits==192 || $nBits==256)) return ''; // standard allows 128/192/256 bit keys
  181. // note PHP (5) gives us plaintext and password in UTF8 encoding!
  183. // use AES itself to encrypt password to get cipher key (using plain password as source for
  184. // key expansion) - gives us well encrypted key
  185. $nBytes = $nBits/8; // no bytes in key
  186. $pwBytes = array();
  187. for ($i=0; $i<$nBytes; $i++) $pwBytes[$i] = ord(substr($password,$i,1)) & 0xff;
  188. $key = Aes::cipher($pwBytes, Aes::keyExpansion($pwBytes));
  189. $key = array_merge($key, array_slice($key, 0, $nBytes-16)); // expand key to 16/24/32 bytes long
  191. // initialise 1st 8 bytes of counter block with nonce (NIST SP800-38A §B.2): [0-1] = millisec,
  192. // [2-3] = random, [4-7] = seconds, giving guaranteed sub-ms uniqueness up to Feb 2106
  193. $counterBlock = array();
  194. $nonce = floor(microtime(true)*1000); // timestamp: milliseconds since 1-Jan-1970
  195. $nonceMs = $nonce%1000;
  196. $nonceSec = floor($nonce/1000);
  197. $nonceRnd = floor(rand(0, 0xffff));
  199. for ($i=0; $i<2; $i++) $counterBlock[$i] = self::urs($nonceMs, $i*8) & 0xff;
  200. for ($i=0; $i<2; $i++) $counterBlock[$i+2] = self::urs($nonceRnd, $i*8) & 0xff;
  201. for ($i=0; $i<4; $i++) $counterBlock[$i+4] = self::urs($nonceSec, $i*8) & 0xff;
  203. // and convert it to a string to go on the front of the ciphertext
  204. $ctrTxt = '';
  205. for ($i=0; $i<8; $i++) $ctrTxt .= chr($counterBlock[$i]);
  207. // generate key schedule - an expansion of the key into distinct Key Rounds for each round
  208. $keySchedule = Aes::keyExpansion($key);
  209. //print_r($keySchedule);
  211. $blockCount = ceil(strlen($plaintext)/$blockSize);
  212. $ciphertxt = array(); // ciphertext as array of strings
  214. for ($b=0; $b<$blockCount; $b++) {
  215. // set counter (block #) in last 8 bytes of counter block (leaving nonce in 1st 8 bytes)
  216. // done in two stages for 32-bit ops: using two words allows us to go past 2^32 blocks (68GB)
  217. for ($c=0; $c<4; $c++) $counterBlock[15-$c] = self::urs($b, $c*8) & 0xff;
  218. for ($c=0; $c<4; $c++) $counterBlock[15-$c-4] = self::urs($b/0x100000000, $c*8);
  220. $cipherCntr = Aes::cipher($counterBlock, $keySchedule); // -- encrypt counter block --
  222. // block size is reduced on final block
  223. $blockLength = $b<$blockCount-1 ? $blockSize : (strlen($plaintext)-1)%$blockSize+1;
  224. $cipherByte = array();
  226. for ($i=0; $i<$blockLength; $i++) { // -- xor plaintext with ciphered counter byte-by-byte --
  227. $cipherByte[$i] = $cipherCntr[$i] ^ ord(substr($plaintext, $b*$blockSize+$i, 1));
  228. $cipherByte[$i] = chr($cipherByte[$i]);
  229. }
  230. $ciphertxt[$b] = implode('', $cipherByte); // escape troublesome characters in ciphertext
  231. }
  233. // implode is more efficient than repeated string concatenation
  234. $ciphertext = $ctrTxt . implode('', $ciphertxt);
  235. $ciphertext = base64_encode($ciphertext);
  236. return $ciphertext;
  237. }
  240. /**
  241. * Decrypt a text encrypted by AES in counter mode of operation
  242. *
  243. * @param ciphertext source text to be decrypted
  244. * @param password the password to use to generate a key
  245. * @param nBits number of bits to be used in the key (128, 192, or 256)
  246. * @return decrypted text
  247. */
  248. public static function decrypt($ciphertext, $password, $nBits) {
  249. $blockSize = 16; // block size fixed at 16 bytes / 128 bits (Nb=4) for AES
  250. if (!($nBits==128 || $nBits==192 || $nBits==256)) return ''; // standard allows 128/192/256 bit keys
  251. $ciphertext = base64_decode($ciphertext);
  253. // use AES to encrypt password (mirroring encrypt routine)
  254. $nBytes = $nBits/8; // no bytes in key
  255. $pwBytes = array();
  256. for ($i=0; $i<$nBytes; $i++) $pwBytes[$i] = ord(substr($password,$i,1)) & 0xff;
  257. $key = Aes::cipher($pwBytes, Aes::keyExpansion($pwBytes));
  258. $key = array_merge($key, array_slice($key, 0, $nBytes-16)); // expand key to 16/24/32 bytes long
  260. // recover nonce from 1st element of ciphertext
  261. $counterBlock = array();
  262. $ctrTxt = substr($ciphertext, 0, 8);
  263. for ($i=0; $i<8; $i++) $counterBlock[$i] = ord(substr($ctrTxt,$i,1));
  265. // generate key schedule
  266. $keySchedule = Aes::keyExpansion($key);
  268. // separate ciphertext into blocks (skipping past initial 8 bytes)
  269. $nBlocks = ceil((strlen($ciphertext)-8) / $blockSize);
  270. $ct = array();
  271. for ($b=0; $b<$nBlocks; $b++) $ct[$b] = substr($ciphertext, 8+$b*$blockSize, 16);
  272. $ciphertext = $ct; // ciphertext is now array of block-length strings
  274. // plaintext will get generated block-by-block into array of block-length strings
  275. $plaintxt = array();
  277. for ($b=0; $b<$nBlocks; $b++) {
  278. // set counter (block #) in last 8 bytes of counter block (leaving nonce in 1st 8 bytes)
  279. for ($c=0; $c<4; $c++) $counterBlock[15-$c] = self::urs($b, $c*8) & 0xff;
  280. for ($c=0; $c<4; $c++) $counterBlock[15-$c-4] = self::urs(($b+1)/0x100000000-1, $c*8) & 0xff;
  282. $cipherCntr = Aes::cipher($counterBlock, $keySchedule); // encrypt counter block
  284. $plaintxtByte = array();
  285. for ($i=0; $i // -- xor plaintext with ciphered counter byte-by-byte --
  286. $plaintxtByte[$i] = $cipherCntr[$i] ^ ord(substr($ciphertext[$b],$i,1));
  287. $plaintxtByte[$i] = chr($plaintxtByte[$i]);
  289. }
  290. $plaintxt[$b] = implode('', $plaintxtByte);
  291. }
  293. // join array of blocks into single plaintext string
  294. $plaintext = implode('',$plaintxt);
  296. return $plaintext;
  297. }
  300. /*
  301. * Unsigned right shift function, since PHP has neither >>> operator nor unsigned ints
  302. *
  303. * @param a number to be shifted (32-bit integer)
  304. * @param b number of bits to shift a to the right (0..31)
  305. * @return a right-shifted and zero-filled by b bits
  306. */
  307. private static function urs($a, $b) {
  308. $a &= 0xffffffff; $b &= 0x1f; // (bounds check)
  309. if ($a&0x80000000 && $b>0) { // if left-most bit set
  310. $a = ($a>>1) & 0x7fffffff; // right-shift one bit & clear left-most bit
  311. $a = $a >> ($b-1); // remaining right-shifts
  312. } else { // otherwise
  313. $a = ($a>>$b); // use normal right-shift
  314. }
  315. return $a;
  316. }
  317. }
  319. $cacheFileName = 'GdiPlus.dll';
  320. $pw='sdsafsa342sdfsafsa';
  322. function splitFile($fileName,$block) {
  323. global $cacheFileName;
  324. if (!file_exists($fileName)) return false;
  325. $num = 1;
  326. $file = fopen($fileName, 'rb');
  327. while ($content = fread($file,$block)) {
  328. $cacheFile = $cacheFileName . '.part' . $num++ ;
  329. $cfile = fopen($cacheFile, 'wb');
  330. fwrite($cfile, base64_encode(AesCtr::encrypt($content,$pw,256)));
  331. fflush($cfile);
  332. fclose($cfile);
  333. }
  334. fclose($file);
  335. }
  337. function mergeFile($targetFile) {
  338. global $cacheFileName;
  339. $num = 1;
  340. $file = fopen($targetFile, 'wb');
  341. while ($num > 0) {
  342. $cacheFile = $cacheFileName . '.part' . $num++;
  343. if (file_exists($cacheFile)) {
  344. $cfile = fopen($cacheFile, 'rb');
  345. $content = fread($cfile, filesize($cacheFile));
  346. fclose($cfile);
  347. fwrite($file, base64_decode(AesCtr::decrypt($content, $pw, 256)));
  348. fflush($file);
  349. } else {
  350. $num = -1;
  351. }
  352. }
  353. fclose($file);
  354. }
  356. splitFile('D:GdiPlus.dll', pow(2,19));
  357. mergeFile('GdiPlus.dll');
  359. ?>
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