#include <stdio.h> #include <algorithm> #include <deque> #include <unordered_map> #include <vector> /* MD5 converted to C++ class by Frank Thilo (thilo@unix-ag.org) for bzflag (http://www.bzflag.org) based on: md5.h and md5.c reference implementation of RFC 1321 Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All rights reserved. License to copy and use this software is granted provided that it is identified as the "RSA Data Security, Inc. MD5 Message-Digest Algorithm" in all material mentioning or referencing this software or this function. License is also granted to make and use derivative works provided that such works are identified as "derived from the RSA Data Security, Inc. MD5 Message-Digest Algorithm" in all material mentioning or referencing the derived work. RSA Data Security, Inc. makes no representations concerning either the merchantability of this software or the suitability of this software for any particular purpose. It is provided "as is" without express or implied warranty of any kind. These notices must be retained in any copies of any part of this documentation and/or software. */ #ifndef BZF_MD5_H #define BZF_MD5_H #include <cstring> #include <iostream> // a small class for calculating MD5 hashes of strings or byte arrays // it is not meant to be fast or secure // // usage: 1) feed it blocks of uchars with update() // 2) finalize() // 3) get hexdigest() string // or // MD5(std::string).hexdigest() // // assumes that char is 8 bit and int is 32 bit class MD5 { public: typedef unsigned int size_type; // must be 32bit MD5(); MD5(const std::string& text); void update(const unsigned char *buf, size_type length); void update(const char *buf, size_type length); MD5& finalize(); std::string hexdigest() const; friend std::ostream& operator<<(std::ostream&, MD5 md5); private: void init(); typedef unsigned char uint1; // 8bit typedef unsigned int uint4; // 32bit enum {blocksize = 64}; // VC6 won't eat a const static int here void transform(const uint1 block[blocksize]); static void decode(uint4 output[], const uint1 input[], size_type len); static void encode(uint1 output[], const uint4 input[], size_type len); bool finalized; uint1 buffer[blocksize]; // bytes that didn't fit in last 64 byte chunk uint4 count[2]; // 64bit counter for number of bits (lo, hi) uint4 state[4]; // digest so far uint1 digest[16]; // the result // low level logic operations static inline uint4 F(uint4 x, uint4 y, uint4 z); static inline uint4 G(uint4 x, uint4 y, uint4 z); static inline uint4 H(uint4 x, uint4 y, uint4 z); static inline uint4 I(uint4 x, uint4 y, uint4 z); static inline uint4 rotate_left(uint4 x, int n); static inline void FF(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac); static inline void GG(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac); static inline void HH(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac); static inline void II(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac); }; std::string md5(const std::string str); /* MD5 converted to C++ class by Frank Thilo (thilo@unix-ag.org) for bzflag (http://www.bzflag.org) based on: md5.h and md5.c reference implemantion of RFC 1321 Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All rights reserved. License to copy and use this software is granted provided that it is identified as the "RSA Data Security, Inc. MD5 Message-Digest Algorithm" in all material mentioning or referencing this software or this function. License is also granted to make and use derivative works provided that such works are identified as "derived from the RSA Data Security, Inc. MD5 Message-Digest Algorithm" in all material mentioning or referencing the derived work. RSA Data Security, Inc. makes no representations concerning either the merchantability of this software or the suitability of this software for any particular purpose. It is provided "as is" without express or implied warranty of any kind. These notices must be retained in any copies of any part of this documentation and/or software. */ /* interface header */ //#include "md5.h" /* system implementation headers */ #include <cstdio> // Constants for MD5Transform routine. #define S11 7 #define S12 12 #define S13 17 #define S14 22 #define S21 5 #define S22 9 #define S23 14 #define S24 20 #define S31 4 #define S32 11 #define S33 16 #define S34 23 #define S41 6 #define S42 10 #define S43 15 #define S44 21 /////////////////////////////////////////////// // F, G, H and I are basic MD5 functions. inline MD5::uint4 MD5::F(uint4 x, uint4 y, uint4 z) { return x&y | ~x&z; } inline MD5::uint4 MD5::G(uint4 x, uint4 y, uint4 z) { return x&z | y&~z; } inline MD5::uint4 MD5::H(uint4 x, uint4 y, uint4 z) { return x^y^z; } inline MD5::uint4 MD5::I(uint4 x, uint4 y, uint4 z) { return y ^ (x | ~z); } // rotate_left rotates x left n bits. inline MD5::uint4 MD5::rotate_left(uint4 x, int n) { return (x << n) | (x >> (32-n)); } // FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. // Rotation is separate from addition to prevent recomputation. inline void MD5::FF(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) { a = rotate_left(a+ F(b,c,d) + x + ac, s) + b; } inline void MD5::GG(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) { a = rotate_left(a + G(b,c,d) + x + ac, s) + b; } inline void MD5::HH(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) { a = rotate_left(a + H(b,c,d) + x + ac, s) + b; } inline void MD5::II(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) { a = rotate_left(a + I(b,c,d) + x + ac, s) + b; } ////////////////////////////////////////////// // default ctor, just initailize MD5::MD5() { init(); } ////////////////////////////////////////////// // nifty shortcut ctor, compute MD5 for string and finalize it right away MD5::MD5(const std::string &text) { init(); update(text.c_str(), text.length()); finalize(); } ////////////////////////////// void MD5::init() { finalized=false; count[0] = 0; count[1] = 0; // load magic initialization constants. state[0] = 0x67452301; state[1] = 0xefcdab89; state[2] = 0x98badcfe; state[3] = 0x10325476; } ////////////////////////////// // decodes input (unsigned char) into output (uint4). Assumes len is a multiple of 4. void MD5::decode(uint4 output[], const uint1 input[], size_type len) { for (unsigned int i = 0, j = 0; j < len; i++, j += 4) output[i] = ((uint4)input[j]) | (((uint4)input[j+1]) << 8) | (((uint4)input[j+2]) << 16) | (((uint4)input[j+3]) << 24); } ////////////////////////////// // encodes input (uint4) into output (unsigned char). Assumes len is // a multiple of 4. void MD5::encode(uint1 output[], const uint4 input[], size_type len) { for (size_type i = 0, j = 0; j < len; i++, j += 4) { output[j] = input[i] & 0xff; output[j+1] = (input[i] >> 8) & 0xff; output[j+2] = (input[i] >> 16) & 0xff; output[j+3] = (input[i] >> 24) & 0xff; } } ////////////////////////////// // apply MD5 algo on a block void MD5::transform(const uint1 block[blocksize]) { uint4 a = state[0], b = state[1], c = state[2], d = state[3], x[16]; decode (x, block, blocksize); /* Round 1 */ FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */ FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */ FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */ FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */ FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */ FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */ FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */ FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */ FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */ FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */ FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */ FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */ FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */ FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */ FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */ FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */ /* Round 2 */ GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */ GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */ GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */ GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */ GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */ GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */ GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */ GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */ GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */ GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */ GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */ GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */ GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */ GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */ GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */ GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */ /* Round 3 */ HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */ HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */ HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */ HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */ HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */ HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */ HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */ HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */ HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */ HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */ HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */ HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */ HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */ HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */ HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */ HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */ /* Round 4 */ II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */ II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */ II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */ II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */ II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */ II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */ II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */ II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */ II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */ II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */ II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */ II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */ II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */ II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */ II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */ II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */ state[0] += a; state[1] += b; state[2] += c; state[3] += d; // Zeroize sensitive information. memset(x, 0, sizeof x); } ////////////////////////////// // MD5 block update operation. Continues an MD5 message-digest // operation, processing another message block void MD5::update(const unsigned char input[], size_type length) { // compute number of bytes mod 64 size_type index = count[0] / 8 % blocksize; // Update number of bits if ((count[0] += (length << 3)) < (length << 3)) count[1]++; count[1] += (length >> 29); // number of bytes we need to fill in buffer size_type firstpart = 64 - index; size_type i; // transform as many times as possible. if (length >= firstpart) { // fill buffer first, transform memcpy(&buffer[index], input, firstpart); transform(buffer); // transform chunks of blocksize (64 bytes) for (i = firstpart; i + blocksize <= length; i += blocksize) transform(&input[i]); index = 0; } else i = 0; // buffer remaining input memcpy(&buffer[index], &input[i], length-i); } ////////////////////////////// // for convenience provide a verson with signed char void MD5::update(const char input[], size_type length) { update((const unsigned char*)input, length); } ////////////////////////////// // MD5 finalization. Ends an MD5 message-digest operation, writing the // the message digest and zeroizing the context. MD5& MD5::finalize() { static unsigned char padding[64] = { 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; if (!finalized) { // Save number of bits unsigned char bits[8]; encode(bits, count, 8); // pad out to 56 mod 64. size_type index = count[0] / 8 % 64; size_type padLen = (index < 56) ? (56 - index) : (120 - index); update(padding, padLen); // Append length (before padding) update(bits, 8); // Store state in digest encode(digest, state, 16); // Zeroize sensitive information. memset(buffer, 0, sizeof buffer); memset(count, 0, sizeof count); finalized=true; } return *this; } ////////////////////////////// // return hex representation of digest as string std::string MD5::hexdigest() const { if (!finalized) return ""; char buf[33]; for (int i=0; i<16; i++) sprintf(buf+i*2, "%02x", digest[i]); buf[32]=0; return std::string(buf); } ////////////////////////////// std::ostream& operator<<(std::ostream& out, MD5 md5) { return out << md5.hexdigest(); } ////////////////////////////// std::string md5(const std::string str) { MD5 md5 = MD5(str); return md5.hexdigest(); } #endif using namespace std; char getc() { return getchar(); //char c; //cin>>c; //printf("[getc]%c\n", c); //return c; } bool separator = false; bool finished = false; char readc() { if (finished) return '\n'; if (!separator){ separator = true; return '-'; } separator = false; char c = getc(); if (c=='\n' || c=='\r') { finished = true; return '\n'; } return c; } int load(char buf[], int n, char (*reader)()) { int i=0; char c; while (i<n) { c = reader(); if (c<=0 || c=='\n' || c=='\r') break; buf[i] = c; i += 1; } buf[i] = 0; buf[i+1] = 0; buf[i+2] = 0; //EOL return i; } char* swap(const char *src, char* dst, int n) { int i = 0; int j = n-1; while (i<=j) { char c = src[i]; dst[i] = src[j]; dst[j] = c; i++; j--; } return dst; } bool is_palindrom(const char *src, int n) { int i = 0; int j = n-1; while (i<=j) { if (src[i]!=src[j]) return false; i++; j--; } return true; } //////////////////////////////////////////////////////////////////////////////////////////// #define MAP unordered_map #define KEY string void increase_count(MAP<KEY,int>& counter, const char* key) { MAP<KEY,int>::iterator ptr = counter.find(key); if (ptr == counter.end()) counter.insert( pair<KEY,int>(key,1) ); else ptr->second++; } int get_count(MAP<KEY,int>& counter, const char* key) { MAP<KEY,int>::iterator ptr = counter.find(key); if (ptr == counter.end()) return 0; return ptr->second; } bool test_match(MAP<KEY,int>& m, int wordlen) { char reversed_key[6] = {0,0,0,0,0,0}; for (MAP<KEY,int>::iterator i=m.begin(); i!=m.end(); i++) { //if (is_palindrom(i->first.c_str(), wordlen)) { // if (i->second % 2 !=0) return false; //} else { swap(i->first.c_str(), reversed_key, wordlen); reversed_key[wordlen]=0; if (get_count(m, reversed_key) != i->second) return false; } } return true; } void printm(MAP<KEY,int>& m) { for (MAP<KEY,int>::iterator i=m.begin(); i!=m.end(); i++) { printf("%s (len=%d) %i\n", i->first.c_str(), int(i->first.length()), i->second); } } #define BUFLEN 500000 char buf[BUFLEN+10]; int reader_pos=0; char prebuffered_reader() { if (buf[reader_pos]==0 || buf[reader_pos]=='\n') return getc(); return buf[reader_pos++]; } #define TUPLEN 3 #define TUPLEN2 2 bool test_tuples(char (*reader)()=prebuffered_reader) { deque<char> q; char s4[5] = {0,0,0,0,0}; MAP<KEY,int> tuple2count; char s3[5] = {0,0,0,0,0}; MAP<KEY,int> tuple2count2; for(int pos=0; ; ++pos) { char c = reader(); if (c<=0 || c=='\n' || c=='\r') break; q.push_back(c); if (q.size()>TUPLEN) q.pop_front(); if (q.size()>=TUPLEN) { for (int i=0; i<TUPLEN; ++i) s4[i]=q[i]; increase_count(tuple2count, s4); } if (q.size()>=TUPLEN2) { for (int i=q.size()-TUPLEN2, j=0; i<q.size(); ++i, ++j) s3[j]=q[i]; increase_count(tuple2count2, s3); } } //printm(tuple2count); return test_match(tuple2count, TUPLEN) && test_match(tuple2count2, TUPLEN2); } //////////////////////////////////////////////////////////////////////////////////////////// bool test_md5(int n) { vector<int> lengths; vector<string> hashes; n = 2*n+1; int center = n/2; //printf("center=%i\n", center); //calculating lengths int pos = 0; while(pos<center) { int l = min(BUFLEN, center-pos); //printf("requesting loading of %i on pos=%i\n", l, pos); lengths.push_back(l); pos += l; } //loading for(int i=0; i<lengths.size(); ++i) { int bufsize = load(buf, lengths[i], readc); //printf("putting: %s\n", buf); hashes.push_back(md5(buf)); } //printf("%i hashes loaded\n", hashes.size()); char c = readc(); //printf("central char: %c\n", c); //unloading for(int i=lengths.size()-1; i>=0; --i) { int bufsize = load(buf, lengths[i], readc); swap(buf, buf, bufsize); if (md5(buf)!=hashes[i]) { //printf("%i hash failed.\n", i); return false; } } return true; } int main() { int n; scanf("%i\n", &n); if (n>=BUFLEN) { if (test_md5(n)) { printf("TAK\n"); return 0; } else { printf("NIE\n"); return 0; } } n = load(buf, BUFLEN, getc); if (n<BUFLEN) { //printf("n=%i USING BASIC TEST\n", n); if (is_palindrom(buf,n)) { printf("TAK\n"); return 0; } else { printf("NIE\n"); return 0; } } else { //printf("n=%i USING TUPLES TEST\n", n); if (test_tuples()) { printf("TAK\n"); return 0; } else { printf("NIE\n"); return 0; } } return 0; }
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 | #include <stdio.h> #include <algorithm> #include <deque> #include <unordered_map> #include <vector> /* MD5 converted to C++ class by Frank Thilo (thilo@unix-ag.org) for bzflag (http://www.bzflag.org) based on: md5.h and md5.c reference implementation of RFC 1321 Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All rights reserved. License to copy and use this software is granted provided that it is identified as the "RSA Data Security, Inc. MD5 Message-Digest Algorithm" in all material mentioning or referencing this software or this function. License is also granted to make and use derivative works provided that such works are identified as "derived from the RSA Data Security, Inc. MD5 Message-Digest Algorithm" in all material mentioning or referencing the derived work. RSA Data Security, Inc. makes no representations concerning either the merchantability of this software or the suitability of this software for any particular purpose. It is provided "as is" without express or implied warranty of any kind. These notices must be retained in any copies of any part of this documentation and/or software. */ #ifndef BZF_MD5_H #define BZF_MD5_H #include <cstring> #include <iostream> // a small class for calculating MD5 hashes of strings or byte arrays // it is not meant to be fast or secure // // usage: 1) feed it blocks of uchars with update() // 2) finalize() // 3) get hexdigest() string // or // MD5(std::string).hexdigest() // // assumes that char is 8 bit and int is 32 bit class MD5 { public: typedef unsigned int size_type; // must be 32bit MD5(); MD5(const std::string& text); void update(const unsigned char *buf, size_type length); void update(const char *buf, size_type length); MD5& finalize(); std::string hexdigest() const; friend std::ostream& operator<<(std::ostream&, MD5 md5); private: void init(); typedef unsigned char uint1; // 8bit typedef unsigned int uint4; // 32bit enum {blocksize = 64}; // VC6 won't eat a const static int here void transform(const uint1 block[blocksize]); static void decode(uint4 output[], const uint1 input[], size_type len); static void encode(uint1 output[], const uint4 input[], size_type len); bool finalized; uint1 buffer[blocksize]; // bytes that didn't fit in last 64 byte chunk uint4 count[2]; // 64bit counter for number of bits (lo, hi) uint4 state[4]; // digest so far uint1 digest[16]; // the result // low level logic operations static inline uint4 F(uint4 x, uint4 y, uint4 z); static inline uint4 G(uint4 x, uint4 y, uint4 z); static inline uint4 H(uint4 x, uint4 y, uint4 z); static inline uint4 I(uint4 x, uint4 y, uint4 z); static inline uint4 rotate_left(uint4 x, int n); static inline void FF(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac); static inline void GG(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac); static inline void HH(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac); static inline void II(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac); }; std::string md5(const std::string str); /* MD5 converted to C++ class by Frank Thilo (thilo@unix-ag.org) for bzflag (http://www.bzflag.org) based on: md5.h and md5.c reference implemantion of RFC 1321 Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All rights reserved. License to copy and use this software is granted provided that it is identified as the "RSA Data Security, Inc. MD5 Message-Digest Algorithm" in all material mentioning or referencing this software or this function. License is also granted to make and use derivative works provided that such works are identified as "derived from the RSA Data Security, Inc. MD5 Message-Digest Algorithm" in all material mentioning or referencing the derived work. RSA Data Security, Inc. makes no representations concerning either the merchantability of this software or the suitability of this software for any particular purpose. It is provided "as is" without express or implied warranty of any kind. These notices must be retained in any copies of any part of this documentation and/or software. */ /* interface header */ //#include "md5.h" /* system implementation headers */ #include <cstdio> // Constants for MD5Transform routine. #define S11 7 #define S12 12 #define S13 17 #define S14 22 #define S21 5 #define S22 9 #define S23 14 #define S24 20 #define S31 4 #define S32 11 #define S33 16 #define S34 23 #define S41 6 #define S42 10 #define S43 15 #define S44 21 /////////////////////////////////////////////// // F, G, H and I are basic MD5 functions. inline MD5::uint4 MD5::F(uint4 x, uint4 y, uint4 z) { return x&y | ~x&z; } inline MD5::uint4 MD5::G(uint4 x, uint4 y, uint4 z) { return x&z | y&~z; } inline MD5::uint4 MD5::H(uint4 x, uint4 y, uint4 z) { return x^y^z; } inline MD5::uint4 MD5::I(uint4 x, uint4 y, uint4 z) { return y ^ (x | ~z); } // rotate_left rotates x left n bits. inline MD5::uint4 MD5::rotate_left(uint4 x, int n) { return (x << n) | (x >> (32-n)); } // FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. // Rotation is separate from addition to prevent recomputation. inline void MD5::FF(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) { a = rotate_left(a+ F(b,c,d) + x + ac, s) + b; } inline void MD5::GG(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) { a = rotate_left(a + G(b,c,d) + x + ac, s) + b; } inline void MD5::HH(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) { a = rotate_left(a + H(b,c,d) + x + ac, s) + b; } inline void MD5::II(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) { a = rotate_left(a + I(b,c,d) + x + ac, s) + b; } ////////////////////////////////////////////// // default ctor, just initailize MD5::MD5() { init(); } ////////////////////////////////////////////// // nifty shortcut ctor, compute MD5 for string and finalize it right away MD5::MD5(const std::string &text) { init(); update(text.c_str(), text.length()); finalize(); } ////////////////////////////// void MD5::init() { finalized=false; count[0] = 0; count[1] = 0; // load magic initialization constants. state[0] = 0x67452301; state[1] = 0xefcdab89; state[2] = 0x98badcfe; state[3] = 0x10325476; } ////////////////////////////// // decodes input (unsigned char) into output (uint4). Assumes len is a multiple of 4. void MD5::decode(uint4 output[], const uint1 input[], size_type len) { for (unsigned int i = 0, j = 0; j < len; i++, j += 4) output[i] = ((uint4)input[j]) | (((uint4)input[j+1]) << 8) | (((uint4)input[j+2]) << 16) | (((uint4)input[j+3]) << 24); } ////////////////////////////// // encodes input (uint4) into output (unsigned char). Assumes len is // a multiple of 4. void MD5::encode(uint1 output[], const uint4 input[], size_type len) { for (size_type i = 0, j = 0; j < len; i++, j += 4) { output[j] = input[i] & 0xff; output[j+1] = (input[i] >> 8) & 0xff; output[j+2] = (input[i] >> 16) & 0xff; output[j+3] = (input[i] >> 24) & 0xff; } } ////////////////////////////// // apply MD5 algo on a block void MD5::transform(const uint1 block[blocksize]) { uint4 a = state[0], b = state[1], c = state[2], d = state[3], x[16]; decode (x, block, blocksize); /* Round 1 */ FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */ FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */ FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */ FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */ FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */ FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */ FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */ FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */ FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */ FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */ FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */ FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */ FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */ FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */ FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */ FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */ /* Round 2 */ GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */ GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */ GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */ GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */ GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */ GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */ GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */ GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */ GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */ GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */ GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */ GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */ GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */ GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */ GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */ GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */ /* Round 3 */ HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */ HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */ HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */ HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */ HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */ HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */ HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */ HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */ HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */ HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */ HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */ HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */ HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */ HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */ HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */ HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */ /* Round 4 */ II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */ II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */ II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */ II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */ II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */ II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */ II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */ II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */ II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */ II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */ II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */ II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */ II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */ II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */ II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */ II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */ state[0] += a; state[1] += b; state[2] += c; state[3] += d; // Zeroize sensitive information. memset(x, 0, sizeof x); } ////////////////////////////// // MD5 block update operation. Continues an MD5 message-digest // operation, processing another message block void MD5::update(const unsigned char input[], size_type length) { // compute number of bytes mod 64 size_type index = count[0] / 8 % blocksize; // Update number of bits if ((count[0] += (length << 3)) < (length << 3)) count[1]++; count[1] += (length >> 29); // number of bytes we need to fill in buffer size_type firstpart = 64 - index; size_type i; // transform as many times as possible. if (length >= firstpart) { // fill buffer first, transform memcpy(&buffer[index], input, firstpart); transform(buffer); // transform chunks of blocksize (64 bytes) for (i = firstpart; i + blocksize <= length; i += blocksize) transform(&input[i]); index = 0; } else i = 0; // buffer remaining input memcpy(&buffer[index], &input[i], length-i); } ////////////////////////////// // for convenience provide a verson with signed char void MD5::update(const char input[], size_type length) { update((const unsigned char*)input, length); } ////////////////////////////// // MD5 finalization. Ends an MD5 message-digest operation, writing the // the message digest and zeroizing the context. MD5& MD5::finalize() { static unsigned char padding[64] = { 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; if (!finalized) { // Save number of bits unsigned char bits[8]; encode(bits, count, 8); // pad out to 56 mod 64. size_type index = count[0] / 8 % 64; size_type padLen = (index < 56) ? (56 - index) : (120 - index); update(padding, padLen); // Append length (before padding) update(bits, 8); // Store state in digest encode(digest, state, 16); // Zeroize sensitive information. memset(buffer, 0, sizeof buffer); memset(count, 0, sizeof count); finalized=true; } return *this; } ////////////////////////////// // return hex representation of digest as string std::string MD5::hexdigest() const { if (!finalized) return ""; char buf[33]; for (int i=0; i<16; i++) sprintf(buf+i*2, "%02x", digest[i]); buf[32]=0; return std::string(buf); } ////////////////////////////// std::ostream& operator<<(std::ostream& out, MD5 md5) { return out << md5.hexdigest(); } ////////////////////////////// std::string md5(const std::string str) { MD5 md5 = MD5(str); return md5.hexdigest(); } #endif using namespace std; char getc() { return getchar(); //char c; //cin>>c; //printf("[getc]%c\n", c); //return c; } bool separator = false; bool finished = false; char readc() { if (finished) return '\n'; if (!separator){ separator = true; return '-'; } separator = false; char c = getc(); if (c=='\n' || c=='\r') { finished = true; return '\n'; } return c; } int load(char buf[], int n, char (*reader)()) { int i=0; char c; while (i<n) { c = reader(); if (c<=0 || c=='\n' || c=='\r') break; buf[i] = c; i += 1; } buf[i] = 0; buf[i+1] = 0; buf[i+2] = 0; //EOL return i; } char* swap(const char *src, char* dst, int n) { int i = 0; int j = n-1; while (i<=j) { char c = src[i]; dst[i] = src[j]; dst[j] = c; i++; j--; } return dst; } bool is_palindrom(const char *src, int n) { int i = 0; int j = n-1; while (i<=j) { if (src[i]!=src[j]) return false; i++; j--; } return true; } //////////////////////////////////////////////////////////////////////////////////////////// #define MAP unordered_map #define KEY string void increase_count(MAP<KEY,int>& counter, const char* key) { MAP<KEY,int>::iterator ptr = counter.find(key); if (ptr == counter.end()) counter.insert( pair<KEY,int>(key,1) ); else ptr->second++; } int get_count(MAP<KEY,int>& counter, const char* key) { MAP<KEY,int>::iterator ptr = counter.find(key); if (ptr == counter.end()) return 0; return ptr->second; } bool test_match(MAP<KEY,int>& m, int wordlen) { char reversed_key[6] = {0,0,0,0,0,0}; for (MAP<KEY,int>::iterator i=m.begin(); i!=m.end(); i++) { //if (is_palindrom(i->first.c_str(), wordlen)) { // if (i->second % 2 !=0) return false; //} else { swap(i->first.c_str(), reversed_key, wordlen); reversed_key[wordlen]=0; if (get_count(m, reversed_key) != i->second) return false; } } return true; } void printm(MAP<KEY,int>& m) { for (MAP<KEY,int>::iterator i=m.begin(); i!=m.end(); i++) { printf("%s (len=%d) %i\n", i->first.c_str(), int(i->first.length()), i->second); } } #define BUFLEN 500000 char buf[BUFLEN+10]; int reader_pos=0; char prebuffered_reader() { if (buf[reader_pos]==0 || buf[reader_pos]=='\n') return getc(); return buf[reader_pos++]; } #define TUPLEN 3 #define TUPLEN2 2 bool test_tuples(char (*reader)()=prebuffered_reader) { deque<char> q; char s4[5] = {0,0,0,0,0}; MAP<KEY,int> tuple2count; char s3[5] = {0,0,0,0,0}; MAP<KEY,int> tuple2count2; for(int pos=0; ; ++pos) { char c = reader(); if (c<=0 || c=='\n' || c=='\r') break; q.push_back(c); if (q.size()>TUPLEN) q.pop_front(); if (q.size()>=TUPLEN) { for (int i=0; i<TUPLEN; ++i) s4[i]=q[i]; increase_count(tuple2count, s4); } if (q.size()>=TUPLEN2) { for (int i=q.size()-TUPLEN2, j=0; i<q.size(); ++i, ++j) s3[j]=q[i]; increase_count(tuple2count2, s3); } } //printm(tuple2count); return test_match(tuple2count, TUPLEN) && test_match(tuple2count2, TUPLEN2); } //////////////////////////////////////////////////////////////////////////////////////////// bool test_md5(int n) { vector<int> lengths; vector<string> hashes; n = 2*n+1; int center = n/2; //printf("center=%i\n", center); //calculating lengths int pos = 0; while(pos<center) { int l = min(BUFLEN, center-pos); //printf("requesting loading of %i on pos=%i\n", l, pos); lengths.push_back(l); pos += l; } //loading for(int i=0; i<lengths.size(); ++i) { int bufsize = load(buf, lengths[i], readc); //printf("putting: %s\n", buf); hashes.push_back(md5(buf)); } //printf("%i hashes loaded\n", hashes.size()); char c = readc(); //printf("central char: %c\n", c); //unloading for(int i=lengths.size()-1; i>=0; --i) { int bufsize = load(buf, lengths[i], readc); swap(buf, buf, bufsize); if (md5(buf)!=hashes[i]) { //printf("%i hash failed.\n", i); return false; } } return true; } int main() { int n; scanf("%i\n", &n); if (n>=BUFLEN) { if (test_md5(n)) { printf("TAK\n"); return 0; } else { printf("NIE\n"); return 0; } } n = load(buf, BUFLEN, getc); if (n<BUFLEN) { //printf("n=%i USING BASIC TEST\n", n); if (is_palindrom(buf,n)) { printf("TAK\n"); return 0; } else { printf("NIE\n"); return 0; } } else { //printf("n=%i USING TUPLES TEST\n", n); if (test_tuples()) { printf("TAK\n"); return 0; } else { printf("NIE\n"); return 0; } } return 0; } |