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
|
/* Copyright 2013-2016 IBM Corp.
*
* 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.
*/
#include <skiboot.h>
#include "container.h"
bool stb_is_container(const void *buf, size_t size)
{
ROM_container_raw *c;
c = (ROM_container_raw*) buf;
if (!buf || size < SECURE_BOOT_HEADERS_SIZE)
return false;
if (be32_to_cpu(c->magic_number) != ROM_MAGIC_NUMBER )
return false;
return true;
}
uint32_t stb_payload_magic(const void *buf, size_t size)
{
uint8_t *p;
if (!stb_is_container(buf, size))
return 0;
p = (uint8_t*) buf;
return be32_to_cpu(*(uint32_t*)(p+SECURE_BOOT_HEADERS_SIZE));
}
uint64_t stb_sw_payload_size(const void *buf, size_t size)
{
struct parsed_stb_container c;
if (!stb_is_container(buf, size))
return 0;
if (parse_stb_container(buf, size, &c) != 0)
return 0;
return be64_to_cpu(c.sh->payload_size);
}
int parse_stb_container(const void* data, size_t len, struct parsed_stb_container *c)
{
const size_t prefix_data_min_size = 3 * (EC_COORDBYTES * 2);
c->buf = data;
c->bufsz = len;
c->c = data;
c->ph = data += sizeof(ROM_container_raw);
c->pd = data += sizeof(ROM_prefix_header_raw) + (c->ph->ecid_count * ECID_SIZE);
c->sh = data += prefix_data_min_size + c->ph->sw_key_count * (EC_COORDBYTES * 2);
c->ssig = data += sizeof(ROM_sw_header_raw) +
c->sh->ecid_count * ECID_SIZE;
return 0;
}
const uint8_t* stb_sw_payload_hash(const void *buf, size_t size)
{
struct parsed_stb_container c;
if (!stb_is_container(buf, size))
return NULL;
if (parse_stb_container(buf, size, &c) != 0)
return NULL;
return c.sh->payload_hash;
}
void stb_print_data(const void* data, size_t len)
{
char hash[1+SHA512_DIGEST_LENGTH*2];
char *h = hash;
char *d = (char*)data;
assert(len <= SHA512_DIGEST_LENGTH);
while(len) {
snprintf(h, 3, "%02x", *d);
h+=2;
d++;
len--;
}
*h='\0';
prlog(PR_NOTICE, "%s\n", hash);
}
|
