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
188
189
190
191
192
193
194
195
|
/*-
* Public Domain 2014-2017 MongoDB, Inc.
* Public Domain 2008-2014 WiredTiger, Inc.
*
* This is free and unencumbered software released into the public domain.
*
* Anyone is free to copy, modify, publish, use, compile, sell, or
* distribute this software, either in source code form or as a compiled
* binary, for any purpose, commercial or non-commercial, and by any
* means.
*
* In jurisdictions that recognize copyright laws, the author or authors
* of this software dedicate any and all copyright interest in the
* software to the public domain. We make this dedication for the benefit
* of the public at large and to the detriment of our heirs and
* successors. We intend this dedication to be an overt act of
* relinquishment in perpetuity of all present and future rights to this
* software under copyright law.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <wiredtiger.h>
#include <wiredtiger_ext.h>
/*! [WT_ENCRYPTOR initialization structure] */
/* Local encryptor structure. */
typedef struct {
WT_ENCRYPTOR encryptor; /* Must come first */
WT_EXTENSION_API *wt_api; /* Extension API */
unsigned long nop_calls; /* Count of calls */
} NOP_ENCRYPTOR;
/*! [WT_ENCRYPTOR initialization structure] */
/*
* nop_error --
* Display an error from this module in a standard way.
*/
static int
nop_error(
NOP_ENCRYPTOR *encryptor, WT_SESSION *session, int err, const char *msg)
{
WT_EXTENSION_API *wt_api;
wt_api = encryptor->wt_api;
(void)wt_api->err_printf(wt_api, session,
"nop encryption: %s: %s", msg, wt_api->strerror(wt_api, NULL, err));
return (err);
}
/*! [WT_ENCRYPTOR encrypt] */
/*
* nop_encrypt --
* A simple encryption example that passes data through unchanged.
*/
static int
nop_encrypt(WT_ENCRYPTOR *encryptor, WT_SESSION *session,
uint8_t *src, size_t src_len,
uint8_t *dst, size_t dst_len,
size_t *result_lenp)
{
NOP_ENCRYPTOR *nop_encryptor = (NOP_ENCRYPTOR *)encryptor;
(void)session; /* Unused parameters */
++nop_encryptor->nop_calls; /* Call count */
if (dst_len < src_len)
return (nop_error(nop_encryptor, session,
ENOMEM, "encrypt buffer not big enough"));
memcpy(dst, src, src_len);
*result_lenp = src_len;
return (0);
}
/*! [WT_ENCRYPTOR encrypt] */
/*! [WT_ENCRYPTOR decrypt] */
/*
* nop_decrypt --
* A simple decryption example that passes data through unchanged.
*/
static int
nop_decrypt(WT_ENCRYPTOR *encryptor, WT_SESSION *session,
uint8_t *src, size_t src_len,
uint8_t *dst, size_t dst_len,
size_t *result_lenp)
{
NOP_ENCRYPTOR *nop_encryptor = (NOP_ENCRYPTOR *)encryptor;
(void)session; /* Unused parameters */
(void)src_len;
++nop_encryptor->nop_calls; /* Call count */
/*
* The destination length is the number of unencrypted bytes we're
* expected to return.
*/
memcpy(dst, src, dst_len);
*result_lenp = dst_len;
return (0);
}
/*! [WT_ENCRYPTOR decrypt] */
/*! [WT_ENCRYPTOR sizing] */
/*
* nop_sizing --
* A simple sizing example that tells wiredtiger that the
* encrypted buffer is always the same as the source buffer.
*/
static int
nop_sizing(WT_ENCRYPTOR *encryptor, WT_SESSION *session,
size_t *expansion_constantp)
{
NOP_ENCRYPTOR *nop_encryptor = (NOP_ENCRYPTOR *)encryptor;
(void)session; /* Unused parameters */
++nop_encryptor->nop_calls; /* Call count */
*expansion_constantp = 0;
return (0);
}
/*! [WT_ENCRYPTOR sizing] */
/*! [WT_ENCRYPTOR terminate] */
/*
* nop_terminate --
* WiredTiger no-op encryption termination.
*/
static int
nop_terminate(WT_ENCRYPTOR *encryptor, WT_SESSION *session)
{
NOP_ENCRYPTOR *nop_encryptor = (NOP_ENCRYPTOR *)encryptor;
(void)session; /* Unused parameters */
++nop_encryptor->nop_calls; /* Call count */
/* Free the allocated memory. */
free(encryptor);
return (0);
}
/*! [WT_ENCRYPTOR terminate] */
/*! [WT_ENCRYPTOR initialization function] */
/*
* wiredtiger_extension_init --
* A simple shared library encryption example.
*/
int
wiredtiger_extension_init(WT_CONNECTION *connection, WT_CONFIG_ARG *config)
{
NOP_ENCRYPTOR *nop_encryptor;
(void)config; /* Unused parameters */
if ((nop_encryptor = calloc(1, sizeof(NOP_ENCRYPTOR))) == NULL)
return (errno);
/*
* Allocate a local encryptor structure, with a WT_ENCRYPTOR structure
* as the first field, allowing us to treat references to either type of
* structure as a reference to the other type.
*
* Heap memory (not static), because it can support multiple databases.
*/
nop_encryptor->encryptor.encrypt = nop_encrypt;
nop_encryptor->encryptor.decrypt = nop_decrypt;
nop_encryptor->encryptor.sizing = nop_sizing;
nop_encryptor->encryptor.terminate = nop_terminate;
nop_encryptor->wt_api = connection->get_extension_api(connection);
/* Load the encryptor */
return (connection->add_encryptor(
connection, "nop", (WT_ENCRYPTOR *)nop_encryptor, NULL));
}
/*! [WT_ENCRYPTOR initialization function] */
|
