1 // Copyright (c) 2009-2010 Satoshi Nakamoto
2 // Copyright (c) 2009-2012 The Bitcoin developers
3 // Distributed under the MIT/X11 software license, see the accompanying
4 // file license.txt or http://www.opensource.org/licenses/mit-license.php.
5 #ifndef BITCOIN_UINT256_H
6 #define BITCOIN_UINT256_H
14 typedef long long int64;
15 typedef unsigned long long uint64;
18 inline int Testuint256AdHoc(std::vector<std::string> vArg);
22 // We have to keep a separate base class without constructors
23 // so the compiler will let us use it in a union
24 template<unsigned int BITS>
28 enum { WIDTH=BITS/32 };
29 unsigned int pn[WIDTH];
32 bool operator!() const
34 for (int i = 0; i < WIDTH; i++)
40 const base_uint operator~() const
43 for (int i = 0; i < WIDTH; i++)
48 const base_uint operator-() const
51 for (int i = 0; i < WIDTH; i++)
58 base_uint& operator=(uint64 b)
60 pn[0] = (unsigned int)b;
61 pn[1] = (unsigned int)(b >> 32);
62 for (int i = 2; i < WIDTH; i++)
67 base_uint& operator^=(const base_uint& b)
69 for (int i = 0; i < WIDTH; i++)
74 base_uint& operator&=(const base_uint& b)
76 for (int i = 0; i < WIDTH; i++)
81 base_uint& operator|=(const base_uint& b)
83 for (int i = 0; i < WIDTH; i++)
88 base_uint& operator^=(uint64 b)
90 pn[0] ^= (unsigned int)b;
91 pn[1] ^= (unsigned int)(b >> 32);
95 base_uint& operator&=(uint64 b)
97 pn[0] &= (unsigned int)b;
98 pn[1] &= (unsigned int)(b >> 32);
102 base_uint& operator|=(uint64 b)
104 pn[0] |= (unsigned int)b;
105 pn[1] |= (unsigned int)(b >> 32);
109 base_uint& operator<<=(unsigned int shift)
112 for (int i = 0; i < WIDTH; i++)
116 for (int i = 0; i < WIDTH; i++)
118 if (i+k+1 < WIDTH && shift != 0)
119 pn[i+k+1] |= (a.pn[i] >> (32-shift));
121 pn[i+k] |= (a.pn[i] << shift);
126 base_uint& operator>>=(unsigned int shift)
129 for (int i = 0; i < WIDTH; i++)
133 for (int i = 0; i < WIDTH; i++)
135 if (i-k-1 >= 0 && shift != 0)
136 pn[i-k-1] |= (a.pn[i] << (32-shift));
138 pn[i-k] |= (a.pn[i] >> shift);
143 base_uint& operator+=(const base_uint& b)
146 for (int i = 0; i < WIDTH; i++)
148 uint64 n = carry + pn[i] + b.pn[i];
149 pn[i] = n & 0xffffffff;
155 base_uint& operator-=(const base_uint& b)
161 base_uint& operator+=(uint64 b64)
169 base_uint& operator-=(uint64 b64)
178 base_uint& operator++()
182 while (++pn[i] == 0 && i < WIDTH-1)
187 const base_uint operator++(int)
190 const base_uint ret = *this;
195 base_uint& operator--()
199 while (--pn[i] == -1 && i < WIDTH-1)
204 const base_uint operator--(int)
207 const base_uint ret = *this;
213 friend inline bool operator<(const base_uint& a, const base_uint& b)
215 for (int i = base_uint::WIDTH-1; i >= 0; i--)
217 if (a.pn[i] < b.pn[i])
219 else if (a.pn[i] > b.pn[i])
225 friend inline bool operator<=(const base_uint& a, const base_uint& b)
227 for (int i = base_uint::WIDTH-1; i >= 0; i--)
229 if (a.pn[i] < b.pn[i])
231 else if (a.pn[i] > b.pn[i])
237 friend inline bool operator>(const base_uint& a, const base_uint& b)
239 for (int i = base_uint::WIDTH-1; i >= 0; i--)
241 if (a.pn[i] > b.pn[i])
243 else if (a.pn[i] < b.pn[i])
249 friend inline bool operator>=(const base_uint& a, const base_uint& b)
251 for (int i = base_uint::WIDTH-1; i >= 0; i--)
253 if (a.pn[i] > b.pn[i])
255 else if (a.pn[i] < b.pn[i])
261 friend inline bool operator==(const base_uint& a, const base_uint& b)
263 for (int i = 0; i < base_uint::WIDTH; i++)
264 if (a.pn[i] != b.pn[i])
269 friend inline bool operator==(const base_uint& a, uint64 b)
271 if (a.pn[0] != (unsigned int)b)
273 if (a.pn[1] != (unsigned int)(b >> 32))
275 for (int i = 2; i < base_uint::WIDTH; i++)
281 friend inline bool operator!=(const base_uint& a, const base_uint& b)
286 friend inline bool operator!=(const base_uint& a, uint64 b)
293 std::string GetHex() const
295 char psz[sizeof(pn)*2 + 1];
296 for (int i = 0; i < sizeof(pn); i++)
297 sprintf(psz + i*2, "%02x", ((unsigned char*)pn)[sizeof(pn) - i - 1]);
298 return std::string(psz, psz + sizeof(pn)*2);
301 void SetHex(const char* psz)
303 for (int i = 0; i < WIDTH; i++)
306 // skip leading spaces
307 while (isspace(*psz))
311 if (psz[0] == '0' && tolower(psz[1]) == 'x')
314 // hex string to uint
315 static char phexdigit[256] = { 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, 0,1,2,3,4,5,6,7,8,9,0,0,0,0,0,0, 0,0xa,0xb,0xc,0xd,0xe,0xf,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, 0,0xa,0xb,0xc,0xd,0xe,0xf,0,0,0,0,0,0,0,0,0 };
316 const char* pbegin = psz;
317 while (phexdigit[*psz] || *psz == '0')
320 unsigned char* p1 = (unsigned char*)pn;
321 unsigned char* pend = p1 + WIDTH * 4;
322 while (psz >= pbegin && p1 < pend)
324 *p1 = phexdigit[(unsigned char)*psz--];
327 *p1 |= (phexdigit[(unsigned char)*psz--] << 4);
333 void SetHex(const std::string& str)
338 std::string ToString() const
343 unsigned char* begin()
345 return (unsigned char*)&pn[0];
350 return (unsigned char*)&pn[WIDTH];
359 unsigned int GetSerializeSize(int nType=0, int nVersion=PROTOCOL_VERSION) const
364 template<typename Stream>
365 void Serialize(Stream& s, int nType=0, int nVersion=PROTOCOL_VERSION) const
367 s.write((char*)pn, sizeof(pn));
370 template<typename Stream>
371 void Unserialize(Stream& s, int nType=0, int nVersion=PROTOCOL_VERSION)
373 s.read((char*)pn, sizeof(pn));
377 friend class uint160;
378 friend class uint256;
379 friend inline int Testuint256AdHoc(std::vector<std::string> vArg);
382 typedef base_uint<160> base_uint160;
383 typedef base_uint<256> base_uint256;
388 // uint160 and uint256 could be implemented as templates, but to keep
389 // compile errors and debugging cleaner, they're copy and pasted.
394 //////////////////////////////////////////////////////////////////////////////
399 class uint160 : public base_uint160
402 typedef base_uint160 basetype;
406 for (int i = 0; i < WIDTH; i++)
410 uint160(const basetype& b)
412 for (int i = 0; i < WIDTH; i++)
416 uint160& operator=(const basetype& b)
418 for (int i = 0; i < WIDTH; i++)
425 pn[0] = (unsigned int)b;
426 pn[1] = (unsigned int)(b >> 32);
427 for (int i = 2; i < WIDTH; i++)
431 uint160& operator=(uint64 b)
433 pn[0] = (unsigned int)b;
434 pn[1] = (unsigned int)(b >> 32);
435 for (int i = 2; i < WIDTH; i++)
440 explicit uint160(const std::string& str)
445 explicit uint160(const std::vector<unsigned char>& vch)
447 if (vch.size() == sizeof(pn))
448 memcpy(pn, &vch[0], sizeof(pn));
454 inline bool operator==(const uint160& a, uint64 b) { return (base_uint160)a == b; }
455 inline bool operator!=(const uint160& a, uint64 b) { return (base_uint160)a != b; }
456 inline const uint160 operator<<(const base_uint160& a, unsigned int shift) { return uint160(a) <<= shift; }
457 inline const uint160 operator>>(const base_uint160& a, unsigned int shift) { return uint160(a) >>= shift; }
458 inline const uint160 operator<<(const uint160& a, unsigned int shift) { return uint160(a) <<= shift; }
459 inline const uint160 operator>>(const uint160& a, unsigned int shift) { return uint160(a) >>= shift; }
461 inline const uint160 operator^(const base_uint160& a, const base_uint160& b) { return uint160(a) ^= b; }
462 inline const uint160 operator&(const base_uint160& a, const base_uint160& b) { return uint160(a) &= b; }
463 inline const uint160 operator|(const base_uint160& a, const base_uint160& b) { return uint160(a) |= b; }
464 inline const uint160 operator+(const base_uint160& a, const base_uint160& b) { return uint160(a) += b; }
465 inline const uint160 operator-(const base_uint160& a, const base_uint160& b) { return uint160(a) -= b; }
467 inline bool operator<(const base_uint160& a, const uint160& b) { return (base_uint160)a < (base_uint160)b; }
468 inline bool operator<=(const base_uint160& a, const uint160& b) { return (base_uint160)a <= (base_uint160)b; }
469 inline bool operator>(const base_uint160& a, const uint160& b) { return (base_uint160)a > (base_uint160)b; }
470 inline bool operator>=(const base_uint160& a, const uint160& b) { return (base_uint160)a >= (base_uint160)b; }
471 inline bool operator==(const base_uint160& a, const uint160& b) { return (base_uint160)a == (base_uint160)b; }
472 inline bool operator!=(const base_uint160& a, const uint160& b) { return (base_uint160)a != (base_uint160)b; }
473 inline const uint160 operator^(const base_uint160& a, const uint160& b) { return (base_uint160)a ^ (base_uint160)b; }
474 inline const uint160 operator&(const base_uint160& a, const uint160& b) { return (base_uint160)a & (base_uint160)b; }
475 inline const uint160 operator|(const base_uint160& a, const uint160& b) { return (base_uint160)a | (base_uint160)b; }
476 inline const uint160 operator+(const base_uint160& a, const uint160& b) { return (base_uint160)a + (base_uint160)b; }
477 inline const uint160 operator-(const base_uint160& a, const uint160& b) { return (base_uint160)a - (base_uint160)b; }
479 inline bool operator<(const uint160& a, const base_uint160& b) { return (base_uint160)a < (base_uint160)b; }
480 inline bool operator<=(const uint160& a, const base_uint160& b) { return (base_uint160)a <= (base_uint160)b; }
481 inline bool operator>(const uint160& a, const base_uint160& b) { return (base_uint160)a > (base_uint160)b; }
482 inline bool operator>=(const uint160& a, const base_uint160& b) { return (base_uint160)a >= (base_uint160)b; }
483 inline bool operator==(const uint160& a, const base_uint160& b) { return (base_uint160)a == (base_uint160)b; }
484 inline bool operator!=(const uint160& a, const base_uint160& b) { return (base_uint160)a != (base_uint160)b; }
485 inline const uint160 operator^(const uint160& a, const base_uint160& b) { return (base_uint160)a ^ (base_uint160)b; }
486 inline const uint160 operator&(const uint160& a, const base_uint160& b) { return (base_uint160)a & (base_uint160)b; }
487 inline const uint160 operator|(const uint160& a, const base_uint160& b) { return (base_uint160)a | (base_uint160)b; }
488 inline const uint160 operator+(const uint160& a, const base_uint160& b) { return (base_uint160)a + (base_uint160)b; }
489 inline const uint160 operator-(const uint160& a, const base_uint160& b) { return (base_uint160)a - (base_uint160)b; }
491 inline bool operator<(const uint160& a, const uint160& b) { return (base_uint160)a < (base_uint160)b; }
492 inline bool operator<=(const uint160& a, const uint160& b) { return (base_uint160)a <= (base_uint160)b; }
493 inline bool operator>(const uint160& a, const uint160& b) { return (base_uint160)a > (base_uint160)b; }
494 inline bool operator>=(const uint160& a, const uint160& b) { return (base_uint160)a >= (base_uint160)b; }
495 inline bool operator==(const uint160& a, const uint160& b) { return (base_uint160)a == (base_uint160)b; }
496 inline bool operator!=(const uint160& a, const uint160& b) { return (base_uint160)a != (base_uint160)b; }
497 inline const uint160 operator^(const uint160& a, const uint160& b) { return (base_uint160)a ^ (base_uint160)b; }
498 inline const uint160 operator&(const uint160& a, const uint160& b) { return (base_uint160)a & (base_uint160)b; }
499 inline const uint160 operator|(const uint160& a, const uint160& b) { return (base_uint160)a | (base_uint160)b; }
500 inline const uint160 operator+(const uint160& a, const uint160& b) { return (base_uint160)a + (base_uint160)b; }
501 inline const uint160 operator-(const uint160& a, const uint160& b) { return (base_uint160)a - (base_uint160)b; }
508 //////////////////////////////////////////////////////////////////////////////
513 class uint256 : public base_uint256
516 typedef base_uint256 basetype;
520 for (int i = 0; i < WIDTH; i++)
524 uint256(const basetype& b)
526 for (int i = 0; i < WIDTH; i++)
530 uint256& operator=(const basetype& b)
532 for (int i = 0; i < WIDTH; i++)
539 pn[0] = (unsigned int)b;
540 pn[1] = (unsigned int)(b >> 32);
541 for (int i = 2; i < WIDTH; i++)
545 uint256& operator=(uint64 b)
547 pn[0] = (unsigned int)b;
548 pn[1] = (unsigned int)(b >> 32);
549 for (int i = 2; i < WIDTH; i++)
554 explicit uint256(const std::string& str)
559 explicit uint256(const std::vector<unsigned char>& vch)
561 if (vch.size() == sizeof(pn))
562 memcpy(pn, &vch[0], sizeof(pn));
568 inline bool operator==(const uint256& a, uint64 b) { return (base_uint256)a == b; }
569 inline bool operator!=(const uint256& a, uint64 b) { return (base_uint256)a != b; }
570 inline const uint256 operator<<(const base_uint256& a, unsigned int shift) { return uint256(a) <<= shift; }
571 inline const uint256 operator>>(const base_uint256& a, unsigned int shift) { return uint256(a) >>= shift; }
572 inline const uint256 operator<<(const uint256& a, unsigned int shift) { return uint256(a) <<= shift; }
573 inline const uint256 operator>>(const uint256& a, unsigned int shift) { return uint256(a) >>= shift; }
575 inline const uint256 operator^(const base_uint256& a, const base_uint256& b) { return uint256(a) ^= b; }
576 inline const uint256 operator&(const base_uint256& a, const base_uint256& b) { return uint256(a) &= b; }
577 inline const uint256 operator|(const base_uint256& a, const base_uint256& b) { return uint256(a) |= b; }
578 inline const uint256 operator+(const base_uint256& a, const base_uint256& b) { return uint256(a) += b; }
579 inline const uint256 operator-(const base_uint256& a, const base_uint256& b) { return uint256(a) -= b; }
581 inline bool operator<(const base_uint256& a, const uint256& b) { return (base_uint256)a < (base_uint256)b; }
582 inline bool operator<=(const base_uint256& a, const uint256& b) { return (base_uint256)a <= (base_uint256)b; }
583 inline bool operator>(const base_uint256& a, const uint256& b) { return (base_uint256)a > (base_uint256)b; }
584 inline bool operator>=(const base_uint256& a, const uint256& b) { return (base_uint256)a >= (base_uint256)b; }
585 inline bool operator==(const base_uint256& a, const uint256& b) { return (base_uint256)a == (base_uint256)b; }
586 inline bool operator!=(const base_uint256& a, const uint256& b) { return (base_uint256)a != (base_uint256)b; }
587 inline const uint256 operator^(const base_uint256& a, const uint256& b) { return (base_uint256)a ^ (base_uint256)b; }
588 inline const uint256 operator&(const base_uint256& a, const uint256& b) { return (base_uint256)a & (base_uint256)b; }
589 inline const uint256 operator|(const base_uint256& a, const uint256& b) { return (base_uint256)a | (base_uint256)b; }
590 inline const uint256 operator+(const base_uint256& a, const uint256& b) { return (base_uint256)a + (base_uint256)b; }
591 inline const uint256 operator-(const base_uint256& a, const uint256& b) { return (base_uint256)a - (base_uint256)b; }
593 inline bool operator<(const uint256& a, const base_uint256& b) { return (base_uint256)a < (base_uint256)b; }
594 inline bool operator<=(const uint256& a, const base_uint256& b) { return (base_uint256)a <= (base_uint256)b; }
595 inline bool operator>(const uint256& a, const base_uint256& b) { return (base_uint256)a > (base_uint256)b; }
596 inline bool operator>=(const uint256& a, const base_uint256& b) { return (base_uint256)a >= (base_uint256)b; }
597 inline bool operator==(const uint256& a, const base_uint256& b) { return (base_uint256)a == (base_uint256)b; }
598 inline bool operator!=(const uint256& a, const base_uint256& b) { return (base_uint256)a != (base_uint256)b; }
599 inline const uint256 operator^(const uint256& a, const base_uint256& b) { return (base_uint256)a ^ (base_uint256)b; }
600 inline const uint256 operator&(const uint256& a, const base_uint256& b) { return (base_uint256)a & (base_uint256)b; }
601 inline const uint256 operator|(const uint256& a, const base_uint256& b) { return (base_uint256)a | (base_uint256)b; }
602 inline const uint256 operator+(const uint256& a, const base_uint256& b) { return (base_uint256)a + (base_uint256)b; }
603 inline const uint256 operator-(const uint256& a, const base_uint256& b) { return (base_uint256)a - (base_uint256)b; }
605 inline bool operator<(const uint256& a, const uint256& b) { return (base_uint256)a < (base_uint256)b; }
606 inline bool operator<=(const uint256& a, const uint256& b) { return (base_uint256)a <= (base_uint256)b; }
607 inline bool operator>(const uint256& a, const uint256& b) { return (base_uint256)a > (base_uint256)b; }
608 inline bool operator>=(const uint256& a, const uint256& b) { return (base_uint256)a >= (base_uint256)b; }
609 inline bool operator==(const uint256& a, const uint256& b) { return (base_uint256)a == (base_uint256)b; }
610 inline bool operator!=(const uint256& a, const uint256& b) { return (base_uint256)a != (base_uint256)b; }
611 inline const uint256 operator^(const uint256& a, const uint256& b) { return (base_uint256)a ^ (base_uint256)b; }
612 inline const uint256 operator&(const uint256& a, const uint256& b) { return (base_uint256)a & (base_uint256)b; }
613 inline const uint256 operator|(const uint256& a, const uint256& b) { return (base_uint256)a | (base_uint256)b; }
614 inline const uint256 operator+(const uint256& a, const uint256& b) { return (base_uint256)a + (base_uint256)b; }
615 inline const uint256 operator-(const uint256& a, const uint256& b) { return (base_uint256)a - (base_uint256)b; }
628 inline int Testuint256AdHoc(std::vector<std::string> vArg)
633 printf("%s\n", g.ToString().c_str());
634 g--; printf("g--\n");
635 printf("%s\n", g.ToString().c_str());
636 g--; printf("g--\n");
637 printf("%s\n", g.ToString().c_str());
638 g++; printf("g++\n");
639 printf("%s\n", g.ToString().c_str());
640 g++; printf("g++\n");
641 printf("%s\n", g.ToString().c_str());
642 g++; printf("g++\n");
643 printf("%s\n", g.ToString().c_str());
644 g++; printf("g++\n");
645 printf("%s\n", g.ToString().c_str());
651 printf("%s\n", a.ToString().c_str());
654 printf("b undefined\n");
655 printf("%s\n", b.ToString().c_str());
660 printf("%s\n", a.ToString().c_str());
665 printf("%s\n", a.ToString().c_str());
673 printf("a %s\n", a.ToString().c_str());
675 a = a | b | (uint256)0x1000;
678 printf("a %s\n", a.ToString().c_str());
679 printf("b %s\n", b.ToString().c_str());
684 printf("%s\n", a.ToString().c_str());
686 printf("%s\n", a.ToString().c_str());
688 printf("%s\n", a.ToString().c_str());
690 printf("%s\n", a.ToString().c_str());
692 printf("%s\n", a.ToString().c_str());
695 printf("%s\n", a.ToString().c_str());
697 printf("%s\n", a.ToString().c_str());
699 printf("%s\n", a.ToString().c_str());
701 printf("%s\n", d.ToString().c_str());
702 printf("%s\n", a.ToString().c_str());
704 printf("%s\n", a.ToString().c_str());
706 printf("%s\n", a.ToString().c_str());
710 printf("%s\n", d.ToString().c_str());
711 for (int i = uint256::WIDTH-1; i >= 0; i--) printf("%08x", d.pn[i]); printf("\n");
715 printf("%s\n", neg.ToString().c_str());
718 uint256 e = uint256("0xABCDEF123abcdef12345678909832180000011111111");
720 printf("%s\n", e.ToString().c_str());
724 uint256 x1 = uint256("0xABCDEF123abcdef12345678909832180000011111111");
726 printf("%s\n", x1.ToString().c_str());
727 for (int i = 0; i < 270; i += 4)
730 printf("%s\n", x2.ToString().c_str());
734 printf("%s\n", x1.ToString().c_str());
735 for (int i = 0; i < 270; i += 4)
739 printf("%s\n", x2.ToString().c_str());
743 for (int i = 0; i < 100; i++)
745 uint256 k = (~uint256(0) >> i);
746 printf("%s\n", k.ToString().c_str());
749 for (int i = 0; i < 100; i++)
751 uint256 k = (~uint256(0) << i);
752 printf("%s\n", k.ToString().c_str());