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
|
/* $OpenBSD: efirng.c,v 1.2 2020/05/25 14:53:59 deraadt Exp $ */
/*
* Copyright (c) 2018 Mark Kettenis <kettenis@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <efi.h>
#include <efiapi.h>
#include "eficall.h"
#include "libsa.h"
extern EFI_BOOT_SERVICES *BS;
/* Random Number Generator Protocol */
#define EFI_RNG_PROTOCOL_GUID \
{ 0x3152bca5, 0xeade, 0x433d, {0x86, 0x2e, 0xc0, 0x1c, 0xdc, 0x29, 0x1f, 0x44} }
INTERFACE_DECL(_EFI_RNG_PROTOCOL);
typedef EFI_GUID EFI_RNG_ALGORITHM;
typedef
EFI_STATUS
(EFIAPI *EFI_RNG_GET_INFO) (
IN struct _EFI_RNG_PROTOCOL *This,
IN OUT UINTN *RNGAlgorithmListSize,
OUT EFI_RNG_ALGORITHM *RNGAlgorithmList
);
typedef
EFI_STATUS
(EFIAPI *EFI_RNG_GET_RNG) (
IN struct _EFI_RNG_PROTOCOL *This,
IN EFI_RNG_ALGORITHM *RNGAlgorithm, OPTIONAL
IN UINTN RNGValueLength,
OUT UINT8 *RNGValue
);
typedef struct _EFI_RNG_PROTOCOL {
EFI_RNG_GET_INFO GetInfo;
EFI_RNG_GET_RNG GetRNG;
} EFI_RNG_PROTOCOL;
static EFI_GUID rng_guid = EFI_RNG_PROTOCOL_GUID;
int
fwrandom(char *buf, size_t buflen)
{
EFI_STATUS status;
EFI_RNG_PROTOCOL *rng = NULL;
UINT8 *random;
size_t i;
int ret = 0;
status = EFI_CALL(BS->LocateProtocol, &rng_guid, NULL, (void **)&rng);
if (rng == NULL || EFI_ERROR(status))
return -1;
random = alloc(buflen);
status = EFI_CALL(rng->GetRNG, rng, NULL, buflen, random);
if (EFI_ERROR(status)) {
printf("RNG GetRNG() failed (%d)\n", status);
ret = -1;
goto out;
}
for (i = 0; i < buflen; i++)
buf[i] ^= random[i];
out:
free(random, buflen);
return ret;
}
|
