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
|
/*
* Copyright (c) 2022 Rubicon Communications, LLC.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* chacha-merged.c version 20080118
* D. J. Bernstein
* Public domain.
*/
#ifndef __included_wg_hchacha20_h__
#define __included_wg_hchacha20_h__
#include <vlib/vlib.h>
/* clang-format off */
#define U32C(v) (v##U)
#define U32V(v) ((u32)(v) & U32C(0xFFFFFFFF))
#define ROTL32(v, n) \
(U32V((v) << (n)) | ((v) >> (32 - (n))))
#define U8TO32_LITTLE(p) \
(((u32)((p)[0]) ) | \
((u32)((p)[1]) << 8) | \
((u32)((p)[2]) << 16) | \
((u32)((p)[3]) << 24))
#define ROTATE(v,c) (ROTL32(v,c))
#define XOR(v,w) ((v) ^ (w))
#define PLUS(v,w) (U32V((v) + (w)))
#define QUARTERROUND(a,b,c,d) \
a = PLUS(a,b); d = ROTATE(XOR(d,a),16); \
c = PLUS(c,d); b = ROTATE(XOR(b,c),12); \
a = PLUS(a,b); d = ROTATE(XOR(d,a), 8); \
c = PLUS(c,d); b = ROTATE(XOR(b,c), 7);
/* clang-format on */
static const char sigma[16] = "expand 32-byte k";
static inline void
hchacha20 (u32 derived_key[8], const u8 nonce[16], const u8 key[32])
{
int i;
u32 x[] = { U8TO32_LITTLE (sigma + 0), U8TO32_LITTLE (sigma + 4),
U8TO32_LITTLE (sigma + 8), U8TO32_LITTLE (sigma + 12),
U8TO32_LITTLE (key + 0), U8TO32_LITTLE (key + 4),
U8TO32_LITTLE (key + 8), U8TO32_LITTLE (key + 12),
U8TO32_LITTLE (key + 16), U8TO32_LITTLE (key + 20),
U8TO32_LITTLE (key + 24), U8TO32_LITTLE (key + 28),
U8TO32_LITTLE (nonce + 0), U8TO32_LITTLE (nonce + 4),
U8TO32_LITTLE (nonce + 8), U8TO32_LITTLE (nonce + 12) };
for (i = 20; i > 0; i -= 2)
{
QUARTERROUND (x[0], x[4], x[8], x[12])
QUARTERROUND (x[1], x[5], x[9], x[13])
QUARTERROUND (x[2], x[6], x[10], x[14])
QUARTERROUND (x[3], x[7], x[11], x[15])
QUARTERROUND (x[0], x[5], x[10], x[15])
QUARTERROUND (x[1], x[6], x[11], x[12])
QUARTERROUND (x[2], x[7], x[8], x[13])
QUARTERROUND (x[3], x[4], x[9], x[14])
}
clib_memcpy (derived_key + 0, x + 0, sizeof (u32) * 4);
clib_memcpy (derived_key + 4, x + 12, sizeof (u32) * 4);
}
#endif /* __included_wg_hchacha20_h__ */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
|
