File: fat-x86_64.c

package info (click to toggle)
nettle 3.5.1+really3.4.1-1
  • links: PTS, VCS
  • area: main
  • in suites: sid
  • size: 8,012 kB
  • sloc: ansic: 51,527; asm: 12,157; sh: 3,632; makefile: 846; cpp: 71; awk: 7
file content (187 lines) | stat: -rw-r--r-- 5,325 bytes parent folder | download | duplicates (3)
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
/* fat-x86_64.c

   Copyright (C) 2015 Niels Möller

   This file is part of GNU Nettle.

   GNU Nettle is free software: you can redistribute it and/or
   modify it under the terms of either:

     * the GNU Lesser General Public License as published by the Free
       Software Foundation; either version 3 of the License, or (at your
       option) any later version.

   or

     * the GNU General Public License as published by the Free
       Software Foundation; either version 2 of the License, or (at your
       option) any later version.

   or both in parallel, as here.

   GNU Nettle is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received copies of the GNU General Public License and
   the GNU Lesser General Public License along with this program.  If
   not, see http://www.gnu.org/licenses/.
*/

#define _GNU_SOURCE

#if HAVE_CONFIG_H
# include "config.h"
#endif

#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "nettle-types.h"

#include "aes-internal.h"
#include "memxor.h"
#include "fat-setup.h"

void _nettle_cpuid (uint32_t input, uint32_t regs[4]);

struct x86_features
{
  enum x86_vendor { X86_OTHER, X86_INTEL, X86_AMD } vendor;
  int have_aesni;
};

#define SKIP(s, slen, literal, llen)				\
  (((slen) >= (llen) && memcmp ((s), (literal), llen) == 0)	\
   ? ((slen) -= (llen), (s) += (llen), 1) : 0)
#define MATCH(s, slen, literal, llen)				\
  ((slen) == (llen) && memcmp ((s), (literal), llen) == 0)

static void
get_x86_features (struct x86_features *features)
{
  const char *s;
  features->vendor = X86_OTHER;
  features->have_aesni = 0;

  s = secure_getenv (ENV_OVERRIDE);
  if (s)
    for (;;)
      {
	const char *sep = strchr (s, ',');
	size_t length = sep ? (size_t) (sep - s) : strlen(s);

	if (SKIP (s, length, "vendor:", 7))
	  {
	    if (MATCH(s, length, "intel", 5))
	      features->vendor = X86_INTEL;
	    else if (MATCH(s, length, "amd", 3))
	      features->vendor = X86_AMD;
	    
	  }
	else if (MATCH (s, length, "aesni", 5))
	  features->have_aesni = 1;
	if (!sep)
	  break;
	s = sep + 1;	
      }
  else
    {
      uint32_t cpuid_data[4];
      _nettle_cpuid (0, cpuid_data);
      if (memcmp (cpuid_data + 1, "Genu" "ntel" "ineI", 12) == 0)
	features->vendor = X86_INTEL;
      else if (memcmp (cpuid_data + 1, "Auth" "cAMD" "enti", 12) == 0)
	features->vendor = X86_AMD;

      _nettle_cpuid (1, cpuid_data);
      if (cpuid_data[2] & 0x02000000)
	features->have_aesni = 1;      
    }
}

DECLARE_FAT_FUNC(_nettle_aes_encrypt, aes_crypt_internal_func)
DECLARE_FAT_FUNC_VAR(aes_encrypt, aes_crypt_internal_func, x86_64)
DECLARE_FAT_FUNC_VAR(aes_encrypt, aes_crypt_internal_func, aesni)

DECLARE_FAT_FUNC(_nettle_aes_decrypt, aes_crypt_internal_func)
DECLARE_FAT_FUNC_VAR(aes_decrypt, aes_crypt_internal_func, x86_64)
DECLARE_FAT_FUNC_VAR(aes_decrypt, aes_crypt_internal_func, aesni)

DECLARE_FAT_FUNC(nettle_memxor, memxor_func)
DECLARE_FAT_FUNC_VAR(memxor, memxor_func, x86_64)
DECLARE_FAT_FUNC_VAR(memxor, memxor_func, sse2)

/* This function should usually be called only once, at startup. But
   it is idempotent, and on x86, pointer updates are atomic, so
   there's no danger if it is called simultaneously from multiple
   threads. */
static void CONSTRUCTOR
fat_init (void)
{
  struct x86_features features;
  int verbose;

  /* FIXME: Replace all getenv calls by getenv_secure? */
  verbose = getenv (ENV_VERBOSE) != NULL;
  if (verbose)
    fprintf (stderr, "libnettle: fat library initialization.\n");

  get_x86_features (&features);
  if (verbose)
    {
      const char * const vendor_names[3] =
	{ "other", "intel", "amd" };
      fprintf (stderr, "libnettle: cpu features: vendor:%s%s\n",
	       vendor_names[features.vendor],
	       features.have_aesni ? ",aesni" : "");
    }
  if (features.have_aesni)
    {
      if (verbose)
	fprintf (stderr, "libnettle: using aes instructions.\n");
      _nettle_aes_encrypt_vec = _nettle_aes_encrypt_aesni;
      _nettle_aes_decrypt_vec = _nettle_aes_decrypt_aesni;
    }
  else
    {
      if (verbose)
	fprintf (stderr, "libnettle: not using aes instructions.\n");
      _nettle_aes_encrypt_vec = _nettle_aes_encrypt_x86_64;
      _nettle_aes_decrypt_vec = _nettle_aes_decrypt_x86_64;
    }

  if (features.vendor == X86_INTEL)
    {
      if (verbose)
	fprintf (stderr, "libnettle: intel SSE2 will be used for memxor.\n");
      nettle_memxor_vec = _nettle_memxor_sse2;
    }
  else
    {
      if (verbose)
	fprintf (stderr, "libnettle: intel SSE2 will not be used for memxor.\n");
      nettle_memxor_vec = _nettle_memxor_x86_64;
    }
}

DEFINE_FAT_FUNC(_nettle_aes_encrypt, void,
		(unsigned rounds, const uint32_t *keys,
		 const struct aes_table *T,
		 size_t length, uint8_t *dst,
		 const uint8_t *src),
		(rounds, keys, T, length, dst, src))

DEFINE_FAT_FUNC(_nettle_aes_decrypt, void,
		(unsigned rounds, const uint32_t *keys,
		 const struct aes_table *T,
		 size_t length, uint8_t *dst,
		 const uint8_t *src),
		(rounds, keys, T, length, dst, src))

DEFINE_FAT_FUNC(nettle_memxor, void *,
		(void *dst, const void *src, size_t n),
		(dst, src, n))