1 // Copyright 2012 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
7 // Core208 applies the Salsa20/8 core function to the 64-byte array in and puts
8 // the result into the 64-byte array out. The input and output may be the same array.
9 func Core208(out *[64]byte, in *[64]byte) {
10 j0 := uint32(in[0]) | uint32(in[1])<<8 | uint32(in[2])<<16 | uint32(in[3])<<24
11 j1 := uint32(in[4]) | uint32(in[5])<<8 | uint32(in[6])<<16 | uint32(in[7])<<24
12 j2 := uint32(in[8]) | uint32(in[9])<<8 | uint32(in[10])<<16 | uint32(in[11])<<24
13 j3 := uint32(in[12]) | uint32(in[13])<<8 | uint32(in[14])<<16 | uint32(in[15])<<24
14 j4 := uint32(in[16]) | uint32(in[17])<<8 | uint32(in[18])<<16 | uint32(in[19])<<24
15 j5 := uint32(in[20]) | uint32(in[21])<<8 | uint32(in[22])<<16 | uint32(in[23])<<24
16 j6 := uint32(in[24]) | uint32(in[25])<<8 | uint32(in[26])<<16 | uint32(in[27])<<24
17 j7 := uint32(in[28]) | uint32(in[29])<<8 | uint32(in[30])<<16 | uint32(in[31])<<24
18 j8 := uint32(in[32]) | uint32(in[33])<<8 | uint32(in[34])<<16 | uint32(in[35])<<24
19 j9 := uint32(in[36]) | uint32(in[37])<<8 | uint32(in[38])<<16 | uint32(in[39])<<24
20 j10 := uint32(in[40]) | uint32(in[41])<<8 | uint32(in[42])<<16 | uint32(in[43])<<24
21 j11 := uint32(in[44]) | uint32(in[45])<<8 | uint32(in[46])<<16 | uint32(in[47])<<24
22 j12 := uint32(in[48]) | uint32(in[49])<<8 | uint32(in[50])<<16 | uint32(in[51])<<24
23 j13 := uint32(in[52]) | uint32(in[53])<<8 | uint32(in[54])<<16 | uint32(in[55])<<24
24 j14 := uint32(in[56]) | uint32(in[57])<<8 | uint32(in[58])<<16 | uint32(in[59])<<24
25 j15 := uint32(in[60]) | uint32(in[61])<<8 | uint32(in[62])<<16 | uint32(in[63])<<24
27 x0, x1, x2, x3, x4, x5, x6, x7, x8 := j0, j1, j2, j3, j4, j5, j6, j7, j8
28 x9, x10, x11, x12, x13, x14, x15 := j9, j10, j11, j12, j13, j14, j15
30 for i := 0; i < 8; i += 2 {
32 x4 ^= u<<7 | u>>(32-7)
34 x8 ^= u<<9 | u>>(32-9)
36 x12 ^= u<<13 | u>>(32-13)
38 x0 ^= u<<18 | u>>(32-18)
41 x9 ^= u<<7 | u>>(32-7)
43 x13 ^= u<<9 | u>>(32-9)
45 x1 ^= u<<13 | u>>(32-13)
47 x5 ^= u<<18 | u>>(32-18)
50 x14 ^= u<<7 | u>>(32-7)
52 x2 ^= u<<9 | u>>(32-9)
54 x6 ^= u<<13 | u>>(32-13)
56 x10 ^= u<<18 | u>>(32-18)
59 x3 ^= u<<7 | u>>(32-7)
61 x7 ^= u<<9 | u>>(32-9)
63 x11 ^= u<<13 | u>>(32-13)
65 x15 ^= u<<18 | u>>(32-18)
68 x1 ^= u<<7 | u>>(32-7)
70 x2 ^= u<<9 | u>>(32-9)
72 x3 ^= u<<13 | u>>(32-13)
74 x0 ^= u<<18 | u>>(32-18)
77 x6 ^= u<<7 | u>>(32-7)
79 x7 ^= u<<9 | u>>(32-9)
81 x4 ^= u<<13 | u>>(32-13)
83 x5 ^= u<<18 | u>>(32-18)
86 x11 ^= u<<7 | u>>(32-7)
88 x8 ^= u<<9 | u>>(32-9)
90 x9 ^= u<<13 | u>>(32-13)
92 x10 ^= u<<18 | u>>(32-18)
95 x12 ^= u<<7 | u>>(32-7)
97 x13 ^= u<<9 | u>>(32-9)
99 x14 ^= u<<13 | u>>(32-13)
101 x15 ^= u<<18 | u>>(32-18)
121 out[1] = byte(x0 >> 8)
122 out[2] = byte(x0 >> 16)
123 out[3] = byte(x0 >> 24)
126 out[5] = byte(x1 >> 8)
127 out[6] = byte(x1 >> 16)
128 out[7] = byte(x1 >> 24)
131 out[9] = byte(x2 >> 8)
132 out[10] = byte(x2 >> 16)
133 out[11] = byte(x2 >> 24)
136 out[13] = byte(x3 >> 8)
137 out[14] = byte(x3 >> 16)
138 out[15] = byte(x3 >> 24)
141 out[17] = byte(x4 >> 8)
142 out[18] = byte(x4 >> 16)
143 out[19] = byte(x4 >> 24)
146 out[21] = byte(x5 >> 8)
147 out[22] = byte(x5 >> 16)
148 out[23] = byte(x5 >> 24)
151 out[25] = byte(x6 >> 8)
152 out[26] = byte(x6 >> 16)
153 out[27] = byte(x6 >> 24)
156 out[29] = byte(x7 >> 8)
157 out[30] = byte(x7 >> 16)
158 out[31] = byte(x7 >> 24)
161 out[33] = byte(x8 >> 8)
162 out[34] = byte(x8 >> 16)
163 out[35] = byte(x8 >> 24)
166 out[37] = byte(x9 >> 8)
167 out[38] = byte(x9 >> 16)
168 out[39] = byte(x9 >> 24)
171 out[41] = byte(x10 >> 8)
172 out[42] = byte(x10 >> 16)
173 out[43] = byte(x10 >> 24)
176 out[45] = byte(x11 >> 8)
177 out[46] = byte(x11 >> 16)
178 out[47] = byte(x11 >> 24)
181 out[49] = byte(x12 >> 8)
182 out[50] = byte(x12 >> 16)
183 out[51] = byte(x12 >> 24)
186 out[53] = byte(x13 >> 8)
187 out[54] = byte(x13 >> 16)
188 out[55] = byte(x13 >> 24)
191 out[57] = byte(x14 >> 8)
192 out[58] = byte(x14 >> 16)
193 out[59] = byte(x14 >> 24)
196 out[61] = byte(x15 >> 8)
197 out[62] = byte(x15 >> 16)
198 out[63] = byte(x15 >> 24)