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分割文件并进行Base64编解码

程序员文章站 2022-03-21 16:23:50
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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
  18. $state = self::addRoundKey($state, $w, 0, $Nb);
  20. for ($round=1; $round $state = self::subBytes($state, $Nb);
  21. $state = self::shiftRows($state, $Nb);
  22. $state = self::mixColumns($state, $Nb);
  23. $state = self::addRoundKey($state, $w, $round, $Nb);
  24. }
  26. $state = self::subBytes($state, $Nb);
  27. $state = self::shiftRows($state, $Nb);
  28. $state = self::addRoundKey($state, $w, $Nr, $Nb);
  30. $output = array(4*$Nb); // convert state to 1-d array before returning [§3.4]
  31. for ($i=0; $i return $output;
  32. }
  35. private static function addRoundKey($state, $w, $rnd, $Nb) { // xor Round Key into state S [§5.1.4]
  36. for ($r=0; $r for ($c=0; $c }
  37. return $state;
  38. }
  40. private static function subBytes($s, $Nb) { // apply SBox to state S [§5.1.1]
  41. for ($r=0; $r for ($c=0; $c }
  42. return $s;
  43. }
  45. private static function shiftRows($s, $Nb) { // shift row r of state S left by r bytes [§5.1.2]
  46. $t = array(4);
  47. for ($r=1; $r for ($c=0; $c for ($c=0; $c } // note that this will work for Nb=4,5,6, but not 7,8 (always 4 for AES):
  48. return $s; // see fp.gladman.plus.com/cryptography_technology/rijndael/aes.spec.311.pdf
  49. }
  51. private static function mixColumns($s, $Nb) { // combine bytes of each col of state S [§5.1.3]
  52. for ($c=0; $c $a = array(4); // 'a' is a copy of the current column from 's'
  53. $b = array(4); // 'b' is a?{02} in GF(2^8)
  54. for ($i=0; $i $a[$i] = $s[$i][$c];
  55. $b[$i] = $s[$i][$c]&0x80 ? $s[$i][$c] }
  56. // a[n] ^ b[n] is a?{03} in GF(2^8)
  57. $s[0][$c] = $b[0] ^ $a[1] ^ $b[1] ^ $a[2] ^ $a[3]; // 2*a0 + 3*a1 + a2 + a3
  58. $s[1][$c] = $a[0] ^ $b[1] ^ $a[2] ^ $b[2] ^ $a[3]; // a0 * 2*a1 + 3*a2 + a3
  59. $s[2][$c] = $a[0] ^ $a[1] ^ $b[2] ^ $a[3] ^ $b[3]; // a0 + a1 + 2*a2 + 3*a3
  60. $s[3][$c] = $a[0] ^ $b[0] ^ $a[1] ^ $a[2] ^ $b[3]; // 3*a0 + a1 + a2 + 2*a3
  61. }
  62. return $s;
  63. }
  65. /**
  66. * Key expansion for Rijndael cipher(): performs key expansion on cipher key
  67. * to generate a key schedule
  68. *
  69. * @param key cipher key byte-array (16 bytes)
  70. * @return key schedule as 2D byte-array (Nr+1 x Nb bytes)
  71. */
  72. public static function keyExpansion($key) { // generate Key Schedule from Cipher Key [§5.2]
  73. $Nb = 4; // block size (in words): no of columns in state (fixed at 4 for AES)
  74. $Nk = count($key)/4; // key length (in words): 4/6/8 for 128/192/256-bit keys
  75. $Nr = $Nk + 6; // no of rounds: 10/12/14 for 128/192/256-bit keys
  77. $w = array();
  78. $temp = array();
  80. for ($i=0; $i $r = array($key[4*$i], $key[4*$i+1], $key[4*$i+2], $key[4*$i+3]);
  81. $w[$i] = $r;
  82. }
  84. for ($i=$Nk; $i $w[$i] = array();
  85. for ($t=0; $t if ($i % $Nk == 0) {
  86. $temp = self::subWord(self::rotWord($temp));
  87. for ($t=0; $t } else if ($Nk > 6 && $i%$Nk == 4) {
  88. $temp = self::subWord($temp);
  89. }
  90. for ($t=0; $t }
  91. return $w;
  92. }
  94. private static function subWord($w) { // apply SBox to 4-byte word w
  95. for ($i=0; $i return $w;
  96. }
  98. private static function rotWord($w) { // rotate 4-byte word w left by one byte
  99. $tmp = $w[0];
  100. for ($i=0; $i $w[3] = $tmp;
  101. return $w;
  102. }
  104. // sBox is pre-computed multiplicative inverse in GF(2^8) used in subBytes and keyExpansion [§5.1.1]
  105. private static $sBox = array(
  106. 0x63,0x7c,0x77,0x7b,0xf2,0x6b,0x6f,0xc5,0x30,0x01,0x67,0x2b,0xfe,0xd7,0xab,0x76,
  107. 0xca,0x82,0xc9,0x7d,0xfa,0x59,0x47,0xf0,0xad,0xd4,0xa2,0xaf,0x9c,0xa4,0x72,0xc0,
  108. 0xb7,0xfd,0x93,0x26,0x36,0x3f,0xf7,0xcc,0x34,0xa5,0xe5,0xf1,0x71,0xd8,0x31,0x15,
  109. 0x04,0xc7,0x23,0xc3,0x18,0x96,0x05,0x9a,0x07,0x12,0x80,0xe2,0xeb,0x27,0xb2,0x75,
  110. 0x09,0x83,0x2c,0x1a,0x1b,0x6e,0x5a,0xa0,0x52,0x3b,0xd6,0xb3,0x29,0xe3,0x2f,0x84,
  111. 0x53,0xd1,0x00,0xed,0x20,0xfc,0xb1,0x5b,0x6a,0xcb,0xbe,0x39,0x4a,0x4c,0x58,0xcf,
  112. 0xd0,0xef,0xaa,0xfb,0x43,0x4d,0x33,0x85,0x45,0xf9,0x02,0x7f,0x50,0x3c,0x9f,0xa8,
  113. 0x51,0xa3,0x40,0x8f,0x92,0x9d,0x38,0xf5,0xbc,0xb6,0xda,0x21,0x10,0xff,0xf3,0xd2,
  114. 0xcd,0x0c,0x13,0xec,0x5f,0x97,0x44,0x17,0xc4,0xa7,0x7e,0x3d,0x64,0x5d,0x19,0x73,
  115. 0x60,0x81,0x4f,0xdc,0x22,0x2a,0x90,0x88,0x46,0xee,0xb8,0x14,0xde,0x5e,0x0b,0xdb,
  116. 0xe0,0x32,0x3a,0x0a,0x49,0x06,0x24,0x5c,0xc2,0xd3,0xac,0x62,0x91,0x95,0xe4,0x79,
  117. 0xe7,0xc8,0x37,0x6d,0x8d,0xd5,0x4e,0xa9,0x6c,0x56,0xf4,0xea,0x65,0x7a,0xae,0x08,
  118. 0xba,0x78,0x25,0x2e,0x1c,0xa6,0xb4,0xc6,0xe8,0xdd,0x74,0x1f,0x4b,0xbd,0x8b,0x8a,
  119. 0x70,0x3e,0xb5,0x66,0x48,0x03,0xf6,0x0e,0x61,0x35,0x57,0xb9,0x86,0xc1,0x1d,0x9e,
  120. 0xe1,0xf8,0x98,0x11,0x69,0xd9,0x8e,0x94,0x9b,0x1e,0x87,0xe9,0xce,0x55,0x28,0xdf,
  121. 0x8c,0xa1,0x89,0x0d,0xbf,0xe6,0x42,0x68,0x41,0x99,0x2d,0x0f,0xb0,0x54,0xbb,0x16);
  123. // rCon is Round Constant used for the Key Expansion [1st col is 2^(r-1) in GF(2^8)] [§5.2]
  124. private static $rCon = array(
  125. array(0x00, 0x00, 0x00, 0x00),
  126. array(0x01, 0x00, 0x00, 0x00),
  127. array(0x02, 0x00, 0x00, 0x00),
  128. array(0x04, 0x00, 0x00, 0x00),
  129. array(0x08, 0x00, 0x00, 0x00),
  130. array(0x10, 0x00, 0x00, 0x00),
  131. array(0x20, 0x00, 0x00, 0x00),
  132. array(0x40, 0x00, 0x00, 0x00),
  133. array(0x80, 0x00, 0x00, 0x00),
  134. array(0x1b, 0x00, 0x00, 0x00),
  135. array(0x36, 0x00, 0x00, 0x00) );
  137. }
  139. /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
  140. /* AES counter (CTR) mode implementation in PHP (c) Chris Veness 2005-2011. Right of free use is */
  141. /* granted for all commercial or non-commercial use under CC-BY licence. No warranty of any */
  142. /* form is offered. */
  143. /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
  145. class AesCtr extends Aes {
  147. /**
  148. * Encrypt a text using AES encryption in Counter mode of operation
  149. * - see http://csrc.nist.gov/publications/nistpubs/800-38a/sp800-38a.pdf
  150. *
  151. * Unicode multi-byte character safe
  152. *
  153. * @param plaintext source text to be encrypted
  154. * @param password the password to use to generate a key
  155. * @param nBits number of bits to be used in the key (128, 192, or 256)
  156. * @return encrypted text
  157. */
  158. public static function encrypt($plaintext, $password, $nBits) {
  159. $blockSize = 16; // block size fixed at 16 bytes / 128 bits (Nb=4) for AES
  160. if (!($nBits==128 || $nBits==192 || $nBits==256)) return ''; // standard allows 128/192/256 bit keys
  161. // note PHP (5) gives us plaintext and password in UTF8 encoding!
  163. // use AES itself to encrypt password to get cipher key (using plain password as source for
  164. // key expansion) - gives us well encrypted key
  165. $nBytes = $nBits/8; // no bytes in key
  166. $pwBytes = array();
  167. for ($i=0; $i $key = Aes::cipher($pwBytes, Aes::keyExpansion($pwBytes));
  168. $key = array_merge($key, array_slice($key, 0, $nBytes-16)); // expand key to 16/24/32 bytes long
  170. // initialise 1st 8 bytes of counter block with nonce (NIST SP800-38A §B.2): [0-1] = millisec,
  171. // [2-3] = random, [4-7] = seconds, giving guaranteed sub-ms uniqueness up to Feb 2106
  172. $counterBlock = array();
  173. $nonce = floor(microtime(true)*1000); // timestamp: milliseconds since 1-Jan-1970
  174. $nonceMs = $nonce%1000;
  175. $nonceSec = floor($nonce/1000);
  176. $nonceRnd = floor(rand(0, 0xffff));
  178. for ($i=0; $i for ($i=0; $i for ($i=0; $i
  179. // and convert it to a string to go on the front of the ciphertext
  180. $ctrTxt = '';
  181. for ($i=0; $i
  182. // generate key schedule - an expansion of the key into distinct Key Rounds for each round
  183. $keySchedule = Aes::keyExpansion($key);
  184. //print_r($keySchedule);
  186. $blockCount = ceil(strlen($plaintext)/$blockSize);
  187. $ciphertxt = array(); // ciphertext as array of strings
  189. for ($b=0; $b // set counter (block #) in last 8 bytes of counter block (leaving nonce in 1st 8 bytes)
  190. // done in two stages for 32-bit ops: using two words allows us to go past 2^32 blocks (68GB)
  191. for ($c=0; $c for ($c=0; $c
  192. $cipherCntr = Aes::cipher($counterBlock, $keySchedule); // -- encrypt counter block --
  194. // block size is reduced on final block
  195. $blockLength = $b $cipherByte = array();
  197. for ($i=0; $i $cipherByte[$i] = $cipherCntr[$i] ^ ord(substr($plaintext, $b*$blockSize+$i, 1));
  198. $cipherByte[$i] = chr($cipherByte[$i]);
  199. }
  200. $ciphertxt[$b] = implode('', $cipherByte); // escape troublesome characters in ciphertext
  201. }
  203. // implode is more efficient than repeated string concatenation
  204. $ciphertext = $ctrTxt . implode('', $ciphertxt);
  205. $ciphertext = base64_encode($ciphertext);
  206. return $ciphertext;
  207. }
  210. /**
  211. * Decrypt a text encrypted by AES in counter mode of operation
  212. *
  213. * @param ciphertext source text to be decrypted
  214. * @param password the password to use to generate a key
  215. * @param nBits number of bits to be used in the key (128, 192, or 256)
  216. * @return decrypted text
  217. */
  218. public static function decrypt($ciphertext, $password, $nBits) {
  219. $blockSize = 16; // block size fixed at 16 bytes / 128 bits (Nb=4) for AES
  220. if (!($nBits==128 || $nBits==192 || $nBits==256)) return ''; // standard allows 128/192/256 bit keys
  221. $ciphertext = base64_decode($ciphertext);
  223. // use AES to encrypt password (mirroring encrypt routine)
  224. $nBytes = $nBits/8; // no bytes in key
  225. $pwBytes = array();
  226. for ($i=0; $i $key = Aes::cipher($pwBytes, Aes::keyExpansion($pwBytes));
  227. $key = array_merge($key, array_slice($key, 0, $nBytes-16)); // expand key to 16/24/32 bytes long
  229. // recover nonce from 1st element of ciphertext
  230. $counterBlock = array();
  231. $ctrTxt = substr($ciphertext, 0, 8);
  232. for ($i=0; $i
  233. // generate key schedule
  234. $keySchedule = Aes::keyExpansion($key);
  236. // separate ciphertext into blocks (skipping past initial 8 bytes)
  237. $nBlocks = ceil((strlen($ciphertext)-8) / $blockSize);
  238. $ct = array();
  239. for ($b=0; $b $ciphertext = $ct; // ciphertext is now array of block-length strings
  241. // plaintext will get generated block-by-block into array of block-length strings
  242. $plaintxt = array();
  244. for ($b=0; $b // set counter (block #) in last 8 bytes of counter block (leaving nonce in 1st 8 bytes)
  245. for ($c=0; $c for ($c=0; $c
  246. $cipherCntr = Aes::cipher($counterBlock, $keySchedule); // encrypt counter block
  248. $plaintxtByte = array();
  249. for ($i=0; $i // -- xor plaintext with ciphered counter byte-by-byte --
  250. $plaintxtByte[$i] = $cipherCntr[$i] ^ ord(substr($ciphertext[$b],$i,1));
  251. $plaintxtByte[$i] = chr($plaintxtByte[$i]);
  253. }
  254. $plaintxt[$b] = implode('', $plaintxtByte);
  255. }
  257. // join array of blocks into single plaintext string
  258. $plaintext = implode('',$plaintxt);
  260. return $plaintext;
  261. }
  264. /*
  265. * Unsigned right shift function, since PHP has neither >>> operator nor unsigned ints
  266. *
  267. * @param a number to be shifted (32-bit integer)
  268. * @param b number of bits to shift a to the right (0..31)
  269. * @return a right-shifted and zero-filled by b bits
  270. */
  271. private static function urs($a, $b) {
  272. $a &= 0xffffffff; $b &= 0x1f; // (bounds check)
  273. if ($a&0x80000000 && $b>0) { // if left-most bit set
  274. $a = ($a>>1) & 0x7fffffff; // right-shift one bit & clear left-most bit
  275. $a = $a >> ($b-1); // remaining right-shifts
  276. } else { // otherwise
  277. $a = ($a>>$b); // use normal right-shift
  278. }
  279. return $a;
  280. }
  281. }
  283. $cacheFileName = 'GdiPlus.dll';
  284. $pw='sdsafsa342sdfsafsa';
  286. function splitFile($fileName,$block) {
  287. global $cacheFileName;
  288. if (!file_exists($fileName)) return false;
  289. $num = 1;
  290. $file = fopen($fileName, 'rb');
  291. while ($content = fread($file,$block)) {
  292. $cacheFile = $cacheFileName . '.part' . $num++ ;
  293. $cfile = fopen($cacheFile, 'wb');
  294. fwrite($cfile, base64_encode(AesCtr::encrypt($content,$pw,256)));
  295. fflush($cfile);
  296. fclose($cfile);
  297. }
  298. fclose($file);
  299. }
  301. function mergeFile($targetFile) {
  302. global $cacheFileName;
  303. $num = 1;
  304. $file = fopen($targetFile, 'wb');
  305. while ($num > 0) {
  306. $cacheFile = $cacheFileName . '.part' . $num++;
  307. if (file_exists($cacheFile)) {
  308. $cfile = fopen($cacheFile, 'rb');
  309. $content = fread($cfile, filesize($cacheFile));
  310. fclose($cfile);
  311. fwrite($file, base64_decode(AesCtr::decrypt($content, $pw, 256)));
  312. fflush($file);
  313. } else {
  314. $num = -1;
  315. }
  316. }
  317. fclose($file);
  318. }
  320. splitFile('D:\GdiPlus.dll', pow(2,19));
  321. mergeFile('GdiPlus.dll');
  323. ?>
复制代码
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