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
|
/*
* nixio - Linux I/O library for lua
*
* Copyright (C) 2009 Steven Barth <steven@midlink.org>
*
* 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 "nixio-tls.h"
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
static char nixio__bin2hex[] = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
};
static int nixio_crypto_hash__init(lua_State *L, int hmac) {
const char *type = luaL_checkstring(L, 1);
nixio_hash *hash = lua_newuserdata(L, sizeof(nixio_hash));
if (!strcmp(type, "md5")) {
hash->type = NIXIO_HASH_MD5;
hash->digest_size = MD5_DIGEST_LENGTH;
hash->block_size = 64;
hash->ctx = malloc(sizeof(MD5_CTX));
if (!hash->ctx) {
return luaL_error(L, NIXIO_OOM);
}
MD5_Init((MD5_CTX*)hash->ctx);
hash->init = (nixio_hash_initcb)MD5_Init;
hash->update = (nixio_hash_updatecb)MD5_Update;
hash->final = (nixio_hash_finalcb)MD5_Final;
} else if (!strcmp(type, "sha1")) {
hash->type = NIXIO_HASH_SHA1;
hash->digest_size = SHA_DIGEST_LENGTH;
hash->block_size = 64;
hash->ctx = malloc(sizeof(SHA_CTX));
if (!hash->ctx) {
return luaL_error(L, NIXIO_OOM);
}
SHA1_Init((SHA_CTX*)hash->ctx);
hash->init = (nixio_hash_initcb)SHA1_Init;
hash->update = (nixio_hash_updatecb)SHA1_Update;
hash->final = (nixio_hash_finalcb)SHA1_Final;
} else {
luaL_argerror(L, 1, "supported values: md5, sha1");
}
luaL_getmetatable(L, NIXIO_CRYPTO_HASH_META);
lua_setmetatable(L, -2);
if (hmac) {
const char *key = luaL_checklstring(L, 2, &hash->key_size);
if (hash->key_size > hash->block_size) {
hash->update(hash->ctx, key, hash->key_size);
hash->final(hash->digest, hash->ctx);
hash->init(hash->ctx);
hash->key_size = hash->digest_size;
memcpy(hash->key, hash->digest, hash->key_size);
} else {
memcpy(hash->key, key, hash->key_size);
}
unsigned char pad[NIXIO_CRYPTO_BLOCK_SIZE];
for (uint i = 0; i < hash->block_size; i++) {
pad[i] = (i < hash->key_size) ? (0x36 ^ hash->key[i]) : 0x36;
}
hash->update(hash->ctx, pad, hash->block_size);
hash->type |= NIXIO_HMAC_BIT;
}
return 1;
}
static int nixio_crypto_hash(lua_State *L) {
return nixio_crypto_hash__init(L, 0);
}
static int nixio_crypto_hmac(lua_State *L) {
return nixio_crypto_hash__init(L, 1);
}
static int nixio_crypto_hash_update(lua_State *L) {
nixio_hash *hash = luaL_checkudata(L, 1, NIXIO_CRYPTO_HASH_META);
if (hash->type) {
size_t len;
const char *chunk = luaL_checklstring(L, 2, &len);
hash->update(hash->ctx, chunk, len);
lua_pushvalue(L, 1);
return 1;
} else {
return luaL_error(L, "Tried to update finalized hash object.");
}
}
static int nixio_crypto_hash_final(lua_State *L) {
nixio_hash *hash = luaL_checkudata(L, 1, NIXIO_CRYPTO_HASH_META);
if (hash->type & NIXIO_HMAC_BIT) {
hash->final(hash->digest, hash->ctx);
hash->init(hash->ctx);
unsigned char pad[NIXIO_CRYPTO_BLOCK_SIZE];
for (uint i = 0; i < hash->block_size; i++) {
pad[i] = (i < hash->key_size) ? (0x5c ^ hash->key[i]) : 0x5c;
}
hash->update(hash->ctx, pad, hash->block_size);
hash->update(hash->ctx, hash->digest, hash->digest_size);
}
if (hash->type) {
hash->type = NIXIO_HASH_NONE;
hash->final(hash->digest, hash->ctx);
free(hash->ctx);
}
char hashdigest[NIXIO_DIGEST_SIZE*2];
for (uint i=0; i < hash->digest_size; i++) {
hashdigest[2*i] = nixio__bin2hex[(hash->digest[i] & 0xf0) >> 4];
hashdigest[2*i+1] = nixio__bin2hex[(hash->digest[i] & 0x0f)];
}
lua_pushlstring(L, hashdigest, hash->digest_size * 2);
memcpy(hashdigest, hash->digest, hash->digest_size);
lua_pushlstring(L, hashdigest, hash->digest_size);
return 2;
}
static int nixio_crypto_hash__gc(lua_State *L) {
nixio_hash *hash = luaL_checkudata(L, 1, NIXIO_CRYPTO_HASH_META);
if (hash->type) {
hash->final(hash->digest, hash->ctx);
free(hash->ctx);
hash->type = NIXIO_HASH_NONE;
}
return 0;
}
static int nixio_crypto_hash__tostring(lua_State *L) {
nixio_hash *hash = luaL_checkudata(L, 1, NIXIO_CRYPTO_HASH_META);
lua_pushfstring(L, "nixio hash object: %p", hash);
return 1;
}
/* module table */
static const luaL_reg R[] = {
{"hash", nixio_crypto_hash},
{"hmac", nixio_crypto_hmac},
{NULL, NULL}
};
/* hash table */
static const luaL_reg M[] = {
{"update", nixio_crypto_hash_update},
{"final", nixio_crypto_hash_final},
{"__gc", nixio_crypto_hash__gc},
{"__tostring", nixio_crypto_hash__tostring},
{NULL, NULL}
};
void nixio_open_tls_crypto(lua_State *L) {
luaL_newmetatable(L, NIXIO_CRYPTO_HASH_META);
luaL_register(L, NULL, M);
lua_pushvalue(L, -1);
lua_setfield(L, -2, "__index");
lua_pop(L, 1);
lua_newtable(L);
luaL_register(L, NULL, R);
lua_setfield(L, -2, "crypto");
}
|
