1 // Copyright (c) 2013-2018 The Bitcoin Core developers
2 // Distributed under the MIT software license, see the accompanying
3 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
4
5 #include <hash.h>
6 #include <crypto/common.h>
7 #include <crypto/hmac_sha512.h>
8
9 #include <string>
10
ROTL32(uint32_t x,int8_t r)11 inline uint32_t ROTL32(uint32_t x, int8_t r)
12 {
13 return (x << r) | (x >> (32 - r));
14 }
15
MurmurHash3(unsigned int nHashSeed,Span<const unsigned char> vDataToHash)16 unsigned int MurmurHash3(unsigned int nHashSeed, Span<const unsigned char> vDataToHash)
17 {
18 // The following is MurmurHash3 (x86_32), see http://code.google.com/p/smhasher/source/browse/trunk/MurmurHash3.cpp
19 uint32_t h1 = nHashSeed;
20 const uint32_t c1 = 0xcc9e2d51;
21 const uint32_t c2 = 0x1b873593;
22
23 const int nblocks = vDataToHash.size() / 4;
24
25 //----------
26 // body
27 const uint8_t* blocks = vDataToHash.data();
28
29 for (int i = 0; i < nblocks; ++i) {
30 uint32_t k1 = ReadLE32(blocks + i*4);
31
32 k1 *= c1;
33 k1 = ROTL32(k1, 15);
34 k1 *= c2;
35
36 h1 ^= k1;
37 h1 = ROTL32(h1, 13);
38 h1 = h1 * 5 + 0xe6546b64;
39 }
40
41 //----------
42 // tail
43 const uint8_t* tail = vDataToHash.data() + nblocks * 4;
44
45 uint32_t k1 = 0;
46
47 switch (vDataToHash.size() & 3) {
48 case 3:
49 k1 ^= tail[2] << 16;
50 case 2:
51 k1 ^= tail[1] << 8;
52 case 1:
53 k1 ^= tail[0];
54 k1 *= c1;
55 k1 = ROTL32(k1, 15);
56 k1 *= c2;
57 h1 ^= k1;
58 }
59
60 //----------
61 // finalization
62 h1 ^= vDataToHash.size();
63 h1 ^= h1 >> 16;
64 h1 *= 0x85ebca6b;
65 h1 ^= h1 >> 13;
66 h1 *= 0xc2b2ae35;
67 h1 ^= h1 >> 16;
68
69 return h1;
70 }
71
BIP32Hash(const ChainCode & chainCode,unsigned int nChild,unsigned char header,const unsigned char data[32],unsigned char output[64])72 void BIP32Hash(const ChainCode &chainCode, unsigned int nChild, unsigned char header, const unsigned char data[32], unsigned char output[64])
73 {
74 unsigned char num[4];
75 num[0] = (nChild >> 24) & 0xFF;
76 num[1] = (nChild >> 16) & 0xFF;
77 num[2] = (nChild >> 8) & 0xFF;
78 num[3] = (nChild >> 0) & 0xFF;
79 CHMAC_SHA512(chainCode.begin(), chainCode.size()).Write(&header, 1).Write(data, 32).Write(num, 4).Finalize(output);
80 }
81
SHA256Uint256(const uint256 & input)82 uint256 SHA256Uint256(const uint256& input)
83 {
84 uint256 result;
85 CSHA256().Write(input.begin(), 32).Finalize(result.begin());
86 return result;
87 }
88
TaggedHash(const std::string & tag)89 CHashWriter TaggedHash(const std::string& tag)
90 {
91 CHashWriter writer(SER_GETHASH, 0);
92 uint256 taghash;
93 CSHA256().Write((const unsigned char*)tag.data(), tag.size()).Finalize(taghash.begin());
94 writer << taghash << taghash;
95 return writer;
96 }
97