-
Notifications
You must be signed in to change notification settings - Fork 1
/
Copy pathchacha20_core.go
283 lines (275 loc) · 5.37 KB
/
chacha20_core.go
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
package unpredictable
func (s *stream) core(output *block) {
x00 := s[0]
x01 := s[1]
x02 := s[2]
x03 := s[3]
x04 := s[4]
x05 := s[5]
x06 := s[6]
x07 := s[7]
x08 := s[8]
x09 := s[9]
x10 := s[10]
x11 := s[11]
x12 := s[12]
x13 := s[13]
x14 := s[14]
x15 := s[15]
for i := 20; i > 0; i -= 2 {
x00 += x04
x12 ^= x00
x12 = (x12 << 16) | (x12 >> 16)
x08 += x12
x04 ^= x08
x04 = (x04 << 12) | (x04 >> 20)
x01 += x05
x13 ^= x01
x13 = (x13 << 16) | (x13 >> 16)
x09 += x13
x05 ^= x09
x05 = (x05 << 12) | (x05 >> 20)
x02 += x06
x14 ^= x02
x14 = (x14 << 16) | (x14 >> 16)
x10 += x14
x06 ^= x10
x06 = (x06 << 12) | (x06 >> 20)
x03 += x07
x15 ^= x03
x15 = (x15 << 16) | (x15 >> 16)
x11 += x15
x07 ^= x11
x07 = (x07 << 12) | (x07 >> 20)
x00 += x04
x12 ^= x00
x12 = (x12 << 8) | (x12 >> 24)
x08 += x12
x04 ^= x08
x04 = (x04 << 7) | (x04 >> 25)
x01 += x05
x13 ^= x01
x13 = (x13 << 8) | (x13 >> 24)
x09 += x13
x05 ^= x09
x05 = (x05 << 7) | (x05 >> 25)
x02 += x06
x14 ^= x02
x14 = (x14 << 8) | (x14 >> 24)
x10 += x14
x06 ^= x10
x06 = (x06 << 7) | (x06 >> 25)
x03 += x07
x15 ^= x03
x15 = (x15 << 8) | (x15 >> 24)
x11 += x15
x07 ^= x11
x07 = (x07 << 7) | (x07 >> 25)
x00 += x05
x15 ^= x00
x15 = (x15 << 16) | (x15 >> 16)
x10 += x15
x05 ^= x10
x05 = (x05 << 12) | (x05 >> 20)
x01 += x06
x12 ^= x01
x12 = (x12 << 16) | (x12 >> 16)
x11 += x12
x06 ^= x11
x06 = (x06 << 12) | (x06 >> 20)
x02 += x07
x13 ^= x02
x13 = (x13 << 16) | (x13 >> 16)
x08 += x13
x07 ^= x08
x07 = (x07 << 12) | (x07 >> 20)
x03 += x04
x14 ^= x03
x14 = (x14 << 16) | (x14 >> 16)
x09 += x14
x04 ^= x09
x04 = (x04 << 12) | (x04 >> 20)
x00 += x05
x15 ^= x00
x15 = (x15 << 8) | (x15 >> 24)
x10 += x15
x05 ^= x10
x05 = (x05 << 7) | (x05 >> 25)
x01 += x06
x12 ^= x01
x12 = (x12 << 8) | (x12 >> 24)
x11 += x12
x06 ^= x11
x06 = (x06 << 7) | (x06 >> 25)
x02 += x07
x13 ^= x02
x13 = (x13 << 8) | (x13 >> 24)
x08 += x13
x07 ^= x08
x07 = (x07 << 7) | (x07 >> 25)
x03 += x04
x14 ^= x03
x14 = (x14 << 8) | (x14 >> 24)
x09 += x14
x04 ^= x09
x04 = (x04 << 7) | (x04 >> 25)
}
output[0] = s[0] + x00
output[1] = s[1] + x01
output[2] = s[2] + x02
output[3] = s[3] + x03
output[4] = s[4] + x04
output[5] = s[5] + x05
output[6] = s[6] + x06
output[7] = s[7] + x07
output[8] = s[8] + x08
output[9] = s[9] + x09
output[10] = s[10] + x10
output[11] = s[11] + x11
output[12] = s[12] + x12
output[13] = s[13] + x13
output[14] = s[14] + x14
output[15] = s[15] + x15
s[12]++
if s[12] == 0 {
s[13]++
}
}
func (s *stream) core_slice(output []block) {
for b := range output {
x00 := s[0]
x01 := s[1]
x02 := s[2]
x03 := s[3]
x04 := s[4]
x05 := s[5]
x06 := s[6]
x07 := s[7]
x08 := s[8]
x09 := s[9]
x10 := s[10]
x11 := s[11]
x12 := s[12]
x13 := s[13]
x14 := s[14]
x15 := s[15]
for i := 20; i > 0; i -= 2 {
x00 += x04
x12 ^= x00
x12 = (x12 << 16) | (x12 >> 16)
x08 += x12
x04 ^= x08
x04 = (x04 << 12) | (x04 >> 20)
x01 += x05
x13 ^= x01
x13 = (x13 << 16) | (x13 >> 16)
x09 += x13
x05 ^= x09
x05 = (x05 << 12) | (x05 >> 20)
x02 += x06
x14 ^= x02
x14 = (x14 << 16) | (x14 >> 16)
x10 += x14
x06 ^= x10
x06 = (x06 << 12) | (x06 >> 20)
x03 += x07
x15 ^= x03
x15 = (x15 << 16) | (x15 >> 16)
x11 += x15
x07 ^= x11
x07 = (x07 << 12) | (x07 >> 20)
x00 += x04
x12 ^= x00
x12 = (x12 << 8) | (x12 >> 24)
x08 += x12
x04 ^= x08
x04 = (x04 << 7) | (x04 >> 25)
x01 += x05
x13 ^= x01
x13 = (x13 << 8) | (x13 >> 24)
x09 += x13
x05 ^= x09
x05 = (x05 << 7) | (x05 >> 25)
x02 += x06
x14 ^= x02
x14 = (x14 << 8) | (x14 >> 24)
x10 += x14
x06 ^= x10
x06 = (x06 << 7) | (x06 >> 25)
x03 += x07
x15 ^= x03
x15 = (x15 << 8) | (x15 >> 24)
x11 += x15
x07 ^= x11
x07 = (x07 << 7) | (x07 >> 25)
x00 += x05
x15 ^= x00
x15 = (x15 << 16) | (x15 >> 16)
x10 += x15
x05 ^= x10
x05 = (x05 << 12) | (x05 >> 20)
x01 += x06
x12 ^= x01
x12 = (x12 << 16) | (x12 >> 16)
x11 += x12
x06 ^= x11
x06 = (x06 << 12) | (x06 >> 20)
x02 += x07
x13 ^= x02
x13 = (x13 << 16) | (x13 >> 16)
x08 += x13
x07 ^= x08
x07 = (x07 << 12) | (x07 >> 20)
x03 += x04
x14 ^= x03
x14 = (x14 << 16) | (x14 >> 16)
x09 += x14
x04 ^= x09
x04 = (x04 << 12) | (x04 >> 20)
x00 += x05
x15 ^= x00
x15 = (x15 << 8) | (x15 >> 24)
x10 += x15
x05 ^= x10
x05 = (x05 << 7) | (x05 >> 25)
x01 += x06
x12 ^= x01
x12 = (x12 << 8) | (x12 >> 24)
x11 += x12
x06 ^= x11
x06 = (x06 << 7) | (x06 >> 25)
x02 += x07
x13 ^= x02
x13 = (x13 << 8) | (x13 >> 24)
x08 += x13
x07 ^= x08
x07 = (x07 << 7) | (x07 >> 25)
x03 += x04
x14 ^= x03
x14 = (x14 << 8) | (x14 >> 24)
x09 += x14
x04 ^= x09
x04 = (x04 << 7) | (x04 >> 25)
}
output[b][0] = s[0] + x00
output[b][1] = s[1] + x01
output[b][2] = s[2] + x02
output[b][3] = s[3] + x03
output[b][4] = s[4] + x04
output[b][5] = s[5] + x05
output[b][6] = s[6] + x06
output[b][7] = s[7] + x07
output[b][8] = s[8] + x08
output[b][9] = s[9] + x09
output[b][10] = s[10] + x10
output[b][11] = s[11] + x11
output[b][12] = s[12] + x12
output[b][13] = s[13] + x13
output[b][14] = s[14] + x14
output[b][15] = s[15] + x15
s[12]++
if s[12] == 0 {
s[13]++
}
}
}