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
|
// SPDX-License-Identifier: GPL-2.0 OR MIT
/*
* Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*
* Implementation of the Poly1305 message authenticator.
*
* Information: https://cr.yp.to/mac.html
*/
#include <zinc/poly1305.h>
#include "../selftest/run.h"
#include <asm/unaligned.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/module.h>
#include <linux/init.h>
#if defined(CONFIG_ZINC_ARCH_X86_64)
#include "poly1305-x86_64-glue.c"
#elif defined(CONFIG_ZINC_ARCH_ARM) || defined(CONFIG_ZINC_ARCH_ARM64)
#include "poly1305-arm-glue.c"
#elif defined(CONFIG_ZINC_ARCH_MIPS) || defined(CONFIG_ZINC_ARCH_MIPS64)
#include "poly1305-mips-glue.c"
#else
static inline bool poly1305_init_arch(void *ctx,
const u8 key[POLY1305_KEY_SIZE])
{
return false;
}
static inline bool poly1305_blocks_arch(void *ctx, const u8 *input,
size_t len, const u32 padbit,
simd_context_t *simd_context)
{
return false;
}
static inline bool poly1305_emit_arch(void *ctx, u8 mac[POLY1305_MAC_SIZE],
const u32 nonce[4],
simd_context_t *simd_context)
{
return false;
}
static bool *const poly1305_nobs[] __initconst = { };
static void __init poly1305_fpu_init(void)
{
}
#endif
#if defined(CONFIG_ARCH_SUPPORTS_INT128) && defined(__SIZEOF_INT128__)
#include "poly1305-donna64.c"
#else
#include "poly1305-donna32.c"
#endif
void poly1305_init(struct poly1305_ctx *ctx, const u8 key[POLY1305_KEY_SIZE])
{
ctx->nonce[0] = get_unaligned_le32(&key[16]);
ctx->nonce[1] = get_unaligned_le32(&key[20]);
ctx->nonce[2] = get_unaligned_le32(&key[24]);
ctx->nonce[3] = get_unaligned_le32(&key[28]);
if (!poly1305_init_arch(ctx->opaque, key))
poly1305_init_generic(ctx->opaque, key);
ctx->num = 0;
}
static inline void poly1305_blocks(void *ctx, const u8 *input, const size_t len,
const u32 padbit,
simd_context_t *simd_context)
{
if (!poly1305_blocks_arch(ctx, input, len, padbit, simd_context))
poly1305_blocks_generic(ctx, input, len, padbit);
}
static inline void poly1305_emit(void *ctx, u8 mac[POLY1305_KEY_SIZE],
const u32 nonce[4],
simd_context_t *simd_context)
{
if (!poly1305_emit_arch(ctx, mac, nonce, simd_context))
poly1305_emit_generic(ctx, mac, nonce);
}
void poly1305_update(struct poly1305_ctx *ctx, const u8 *input, size_t len,
simd_context_t *simd_context)
{
const size_t num = ctx->num;
size_t rem;
if (num) {
rem = POLY1305_BLOCK_SIZE - num;
if (len < rem) {
memcpy(ctx->data + num, input, len);
ctx->num = num + len;
return;
}
memcpy(ctx->data + num, input, rem);
poly1305_blocks(ctx->opaque, ctx->data, POLY1305_BLOCK_SIZE, 1,
simd_context);
input += rem;
len -= rem;
}
rem = len % POLY1305_BLOCK_SIZE;
len -= rem;
if (len >= POLY1305_BLOCK_SIZE) {
poly1305_blocks(ctx->opaque, input, len, 1, simd_context);
input += len;
}
if (rem)
memcpy(ctx->data, input, rem);
ctx->num = rem;
}
void poly1305_final(struct poly1305_ctx *ctx, u8 mac[POLY1305_MAC_SIZE],
simd_context_t *simd_context)
{
size_t num = ctx->num;
if (num) {
ctx->data[num++] = 1;
while (num < POLY1305_BLOCK_SIZE)
ctx->data[num++] = 0;
poly1305_blocks(ctx->opaque, ctx->data, POLY1305_BLOCK_SIZE, 0,
simd_context);
}
poly1305_emit(ctx->opaque, mac, ctx->nonce, simd_context);
memzero_explicit(ctx, sizeof(*ctx));
}
#include "../selftest/poly1305.c"
static bool nosimd __initdata = false;
#ifndef COMPAT_ZINC_IS_A_MODULE
int __init poly1305_mod_init(void)
#else
static int __init mod_init(void)
#endif
{
if (!nosimd)
poly1305_fpu_init();
if (!selftest_run("poly1305", poly1305_selftest, poly1305_nobs,
ARRAY_SIZE(poly1305_nobs)))
return -ENOTRECOVERABLE;
return 0;
}
#ifdef COMPAT_ZINC_IS_A_MODULE
static void __exit mod_exit(void)
{
}
module_param(nosimd, bool, 0);
module_init(mod_init);
module_exit(mod_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Poly1305 one-time authenticator");
MODULE_AUTHOR("Jason A. Donenfeld <Jason@zx2c4.com>");
#endif
|
