Repository navigation
Expand file tree
/
Copy pathsha3.cpp
More file actions
289 lines (251 loc) · 7.72 KB
/
Copy pathsha3.cpp
File metadata and controls
289 lines (251 loc) · 7.72 KB
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
// //////////////////////////////////////////////////////////
// sha3.cpp
// Copyright (c) 2014,2015 Stephan Brumme. All rights reserved.
// see http://create.stephan-brumme.com/disclaimer.html
//
#include "sha3.h"
// big endian architectures need #define __BYTE_ORDER __BIG_ENDIAN
#ifndef _MSC_VER
#include <endian.h>
#endif
/// same as reset()
SHA3::SHA3(Bits bits)
: m_blockSize(200 - 2 * (bits / 8))
, m_bits(bits) {
reset();
}
/// restart
void SHA3::reset() {
for (size_t i = 0; i < StateSize; i++)
m_hash[i] = 0;
m_numBytes = 0;
m_bufferSize = 0;
}
/// constants and local helper functions
namespace {
const unsigned int Rounds = 24;
const uint64_t XorMasks[Rounds]
= {0x0000000000000001ULL, 0x0000000000008082ULL, 0x800000000000808aULL, 0x8000000080008000ULL, 0x000000000000808bULL, 0x0000000080000001ULL, 0x8000000080008081ULL, 0x8000000000008009ULL, 0x000000000000008aULL, 0x0000000000000088ULL, 0x0000000080008009ULL, 0x000000008000000aULL, 0x000000008000808bULL, 0x800000000000008bULL, 0x8000000000008089ULL, 0x8000000000008003ULL, 0x8000000000008002ULL, 0x8000000000000080ULL, 0x000000000000800aULL, 0x800000008000000aULL, 0x8000000080008081ULL, 0x8000000000008080ULL, 0x0000000080000001ULL, 0x8000000080008008ULL};
/// rotate left and wrap around to the right
inline uint64_t rotateLeft(uint64_t x, uint8_t numBits) {
return (x << numBits) | (x >> (64 - numBits));
}
/// convert litte vs big endian
inline uint64_t swap(uint64_t x) {
#if defined(__GNUC__) || defined(__clang__)
return __builtin_bswap64(x);
#endif
#ifdef _MSC_VER
return _byteswap_uint64(x);
#endif
return (x >> 56) | ((x >> 40) & 0x000000000000FF00ULL) | ((x >> 24) & 0x0000000000FF0000ULL) | ((x >> 8) & 0x00000000FF000000ULL)
| ((x << 8) & 0x000000FF00000000ULL) | ((x << 24) & 0x0000FF0000000000ULL) | ((x << 40) & 0x00FF000000000000ULL) | (x << 56);
}
/// return x % 5 for 0 <= x <= 9
unsigned int mod5(unsigned int x) {
if (x < 5)
return x;
return x - 5;
}
} // namespace
/// process a full block
void SHA3::processBlock(const void *data) {
#if defined(__BYTE_ORDER) && (__BYTE_ORDER != 0) && (__BYTE_ORDER == __BIG_ENDIAN)
#define LITTLEENDIAN(x) swap(x)
#else
#define LITTLEENDIAN(x) (x)
#endif
const uint64_t *data64 = (const uint64_t *)data;
// mix data into state
for (unsigned int i = 0; i < m_blockSize / 8; i++)
m_hash[i] ^= LITTLEENDIAN(data64[i]);
// re-compute state
for (unsigned int round = 0; round < Rounds; round++) {
// Theta
uint64_t coefficients[5];
for (unsigned int i = 0; i < 5; i++)
coefficients[i] = m_hash[i] ^ m_hash[i + 5] ^ m_hash[i + 10] ^ m_hash[i + 15] ^ m_hash[i + 20];
for (unsigned int i = 0; i < 5; i++) {
uint64_t one = coefficients[mod5(i + 4)] ^ rotateLeft(coefficients[mod5(i + 1)], 1);
m_hash[i] ^= one;
m_hash[i + 5] ^= one;
m_hash[i + 10] ^= one;
m_hash[i + 15] ^= one;
m_hash[i + 20] ^= one;
}
// temporary
uint64_t one;
// Rho Pi
uint64_t last = m_hash[1];
one = m_hash[10];
m_hash[10] = rotateLeft(last, 1);
last = one;
one = m_hash[7];
m_hash[7] = rotateLeft(last, 3);
last = one;
one = m_hash[11];
m_hash[11] = rotateLeft(last, 6);
last = one;
one = m_hash[17];
m_hash[17] = rotateLeft(last, 10);
last = one;
one = m_hash[18];
m_hash[18] = rotateLeft(last, 15);
last = one;
one = m_hash[3];
m_hash[3] = rotateLeft(last, 21);
last = one;
one = m_hash[5];
m_hash[5] = rotateLeft(last, 28);
last = one;
one = m_hash[16];
m_hash[16] = rotateLeft(last, 36);
last = one;
one = m_hash[8];
m_hash[8] = rotateLeft(last, 45);
last = one;
one = m_hash[21];
m_hash[21] = rotateLeft(last, 55);
last = one;
one = m_hash[24];
m_hash[24] = rotateLeft(last, 2);
last = one;
one = m_hash[4];
m_hash[4] = rotateLeft(last, 14);
last = one;
one = m_hash[15];
m_hash[15] = rotateLeft(last, 27);
last = one;
one = m_hash[23];
m_hash[23] = rotateLeft(last, 41);
last = one;
one = m_hash[19];
m_hash[19] = rotateLeft(last, 56);
last = one;
one = m_hash[13];
m_hash[13] = rotateLeft(last, 8);
last = one;
one = m_hash[12];
m_hash[12] = rotateLeft(last, 25);
last = one;
one = m_hash[2];
m_hash[2] = rotateLeft(last, 43);
last = one;
one = m_hash[20];
m_hash[20] = rotateLeft(last, 62);
last = one;
one = m_hash[14];
m_hash[14] = rotateLeft(last, 18);
last = one;
one = m_hash[22];
m_hash[22] = rotateLeft(last, 39);
last = one;
one = m_hash[9];
m_hash[9] = rotateLeft(last, 61);
last = one;
one = m_hash[6];
m_hash[6] = rotateLeft(last, 20);
last = one;
m_hash[1] = rotateLeft(last, 44);
// Chi
for (unsigned int j = 0; j < 25; j += 5) {
// temporaries
uint64_t one = m_hash[j];
uint64_t two = m_hash[j + 1];
m_hash[j] ^= m_hash[j + 2] & ~two;
m_hash[j + 1] ^= m_hash[j + 3] & ~m_hash[j + 2];
m_hash[j + 2] ^= m_hash[j + 4] & ~m_hash[j + 3];
m_hash[j + 3] ^= one & ~m_hash[j + 4];
m_hash[j + 4] ^= two & ~one;
}
// Iota
m_hash[0] ^= XorMasks[round];
}
}
/// add arbitrary number of bytes
void SHA3::add(const void *data, size_t numBytes) {
const uint8_t *current = (const uint8_t *)data;
// copy data to buffer
if (m_bufferSize > 0) {
while (numBytes > 0 && m_bufferSize < m_blockSize) {
m_buffer[m_bufferSize++] = *current++;
numBytes--;
}
}
// full buffer
if (m_bufferSize == m_blockSize) {
processBlock((void *)m_buffer);
m_numBytes += m_blockSize;
m_bufferSize = 0;
}
// no more data ?
if (numBytes == 0)
return;
// process full blocks
while (numBytes >= m_blockSize) {
processBlock(current);
current += m_blockSize;
m_numBytes += m_blockSize;
numBytes -= m_blockSize;
}
// keep remaining bytes in buffer
while (numBytes > 0) {
m_buffer[m_bufferSize++] = *current++;
numBytes--;
}
}
/// process everything left in the internal buffer
void SHA3::processBuffer() {
// add padding
size_t offset = m_bufferSize;
// add a "1" byte
m_buffer[offset++] = 0x06;
// fill with zeros
while (offset < m_blockSize)
m_buffer[offset++] = 0;
// and add a single set bit
m_buffer[offset - 1] |= 0x80;
processBlock(m_buffer);
}
/// return latest hash as 16 hex characters
std::string SHA3::getHash() {
// process remaining bytes
processBuffer();
// convert hash to string
static const char dec2hex[16 + 1] = "0123456789abcdef";
// number of significant elements in hash (uint64_t)
unsigned int hashLength = m_bits / 64;
std::string result;
result.reserve(m_bits / 4);
for (unsigned int i = 0; i < hashLength; i++)
for (unsigned int j = 0; j < 8; j++) // 64 bits => 8 bytes
{
// convert a byte to hex
unsigned char oneByte = (unsigned char)(m_hash[i] >> (8 * j));
result += dec2hex[oneByte >> 4];
result += dec2hex[oneByte & 15];
}
// SHA3-224's last entry in m_hash provides only 32 bits instead of 64 bits
unsigned int remainder = m_bits - hashLength * 64;
unsigned int processed = 0;
while (processed < remainder) {
// convert a byte to hex
unsigned char oneByte = (unsigned char)(m_hash[hashLength] >> processed);
result += dec2hex[oneByte >> 4];
result += dec2hex[oneByte & 15];
processed += 8;
}
return result;
}
/// compute SHA3 of a memory block
std::string SHA3::operator()(const void *data, size_t numBytes) {
reset();
add(data, numBytes);
return getHash();
}
/// compute SHA3 of a string, excluding final zero
std::string SHA3::operator()(const std::string &text) {
reset();
add(text.c_str(), text.size());
return getHash();
}