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
|
/*
*
* Copyright 2018 gRPC authors.
*
* 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 <grpc/support/port_platform.h>
#include "src/core/tsi/alts/frame_protector/alts_counter.h"
#include <string.h>
#include <grpc/support/alloc.h>
static void maybe_copy_error_msg(const char* src, char** dst) {
if (dst != nullptr && src != nullptr) {
*dst = static_cast<char*>(gpr_malloc(strlen(src) + 1));
memcpy(*dst, src, strlen(src) + 1);
}
}
grpc_status_code alts_counter_create(bool is_client, size_t counter_size,
size_t overflow_size,
alts_counter** crypter_counter,
char** error_details) {
/* Perform input sanity check. */
if (counter_size == 0) {
const char error_msg[] = "counter_size is invalid.";
maybe_copy_error_msg(error_msg, error_details);
return GRPC_STATUS_INVALID_ARGUMENT;
}
if (overflow_size == 0 || overflow_size >= counter_size) {
const char error_msg[] = "overflow_size is invalid.";
maybe_copy_error_msg(error_msg, error_details);
return GRPC_STATUS_INVALID_ARGUMENT;
}
if (crypter_counter == nullptr) {
const char error_msg[] = "crypter_counter is nullptr.";
maybe_copy_error_msg(error_msg, error_details);
return GRPC_STATUS_INVALID_ARGUMENT;
}
*crypter_counter =
static_cast<alts_counter*>(gpr_malloc(sizeof(**crypter_counter)));
(*crypter_counter)->size = counter_size;
(*crypter_counter)->overflow_size = overflow_size;
(*crypter_counter)->counter =
static_cast<unsigned char*>(gpr_zalloc(counter_size));
if (is_client) {
((*crypter_counter)->counter)[counter_size - 1] = 0x80;
}
return GRPC_STATUS_OK;
}
grpc_status_code alts_counter_increment(alts_counter* crypter_counter,
bool* is_overflow,
char** error_details) {
/* Perform input sanity check. */
if (crypter_counter == nullptr) {
const char error_msg[] = "crypter_counter is nullptr.";
maybe_copy_error_msg(error_msg, error_details);
return GRPC_STATUS_INVALID_ARGUMENT;
}
if (is_overflow == nullptr) {
const char error_msg[] = "is_overflow is nullptr.";
maybe_copy_error_msg(error_msg, error_details);
return GRPC_STATUS_INVALID_ARGUMENT;
}
/* Increment the internal counter. */
size_t i = 0;
for (; i < crypter_counter->overflow_size; i++) {
(crypter_counter->counter)[i]++;
if ((crypter_counter->counter)[i] != 0x00) {
break;
}
}
/**
* If the lower overflow_size bytes are all zero, the counter has overflowed.
*/
if (i == crypter_counter->overflow_size) {
*is_overflow = true;
return GRPC_STATUS_FAILED_PRECONDITION;
}
*is_overflow = false;
return GRPC_STATUS_OK;
}
size_t alts_counter_get_size(alts_counter* crypter_counter) {
if (crypter_counter == nullptr) {
return 0;
}
return crypter_counter->size;
}
unsigned char* alts_counter_get_counter(alts_counter* crypter_counter) {
if (crypter_counter == nullptr) {
return nullptr;
}
return crypter_counter->counter;
}
void alts_counter_destroy(alts_counter* crypter_counter) {
if (crypter_counter != nullptr) {
gpr_free(crypter_counter->counter);
gpr_free(crypter_counter);
}
}
|
