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
|
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <libubox/md5.h>
#include <libubox/utils.h>
#include "uclient-utils.h"
static const char *b64 =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
void base64_encode(const void *inbuf, unsigned int len, void *outbuf)
{
unsigned char *out = outbuf;
const uint8_t *in = inbuf;
unsigned int i;
int pad = len % 3;
for (i = 0; i < len - pad; i += 3) {
uint32_t in3 = (in[0] << 16) | (in[1] << 8) | in[2];
int k;
for (k = 3; k >= 0; k--) {
out[k] = b64[in3 & 0x3f];
in3 >>= 6;
}
in += 3;
out += 4;
}
if (pad) {
uint32_t in2 = in[0] << (16 - 6);
out[3] = '=';
if (pad > 1) {
in2 |= in[1] << (8 - 6);
out[2] = b64[in2 & 0x3f];
} else {
out[2] = '=';
}
in2 >>= 6;
out[1] = b64[in2 & 0x3f];
in2 >>= 6;
out[0] = b64[in2 & 0x3f];
out += 4;
}
*out = '\0';
}
int uclient_urldecode(const char *in, char *out, bool decode_plus)
{
static char dec[3];
int ret = 0;
char c;
while ((c = *(in++))) {
if (c == '%') {
if (!isxdigit(in[0]) || !isxdigit(in[1]))
return -1;
dec[0] = in[0];
dec[1] = in[1];
c = strtol(dec, NULL, 16);
in += 2;
} else if (decode_plus && c == '+') {
c = ' ';
}
*(out++) = c;
ret++;
}
*out = 0;
return ret;
}
static char hex_digit(char val)
{
val += val > 9 ? 'a' - 10 : '0';
return val;
}
void bin_to_hex(char *dest, const void *buf, int len)
{
const uint8_t *data = buf;
int i;
for (i = 0; i < len; i++) {
*(dest++) = hex_digit(data[i] >> 4);
*(dest++) = hex_digit(data[i] & 0xf);
}
*dest = 0;
}
static void http_create_hash(char *dest, const char * const * str, int n_str)
{
uint32_t hash[4];
md5_ctx_t md5;
int i;
md5_begin(&md5);
for (i = 0; i < n_str; i++) {
if (i)
md5_hash(":", 1, &md5);
md5_hash(str[i], strlen(str[i]), &md5);
}
md5_end(hash, &md5);
bin_to_hex(dest, &hash, sizeof(hash));
}
void http_digest_calculate_auth_hash(char *dest, const char *user, const char *realm, const char *password)
{
const char *hash_str[] = {
user,
realm,
password
};
http_create_hash(dest, hash_str, ARRAY_SIZE(hash_str));
}
void http_digest_calculate_response(char *dest, const struct http_digest_data *data)
{
const char *h_a2_strings[] = {
data->method,
data->uri,
};
const char *resp_strings[] = {
data->auth_hash,
data->nonce,
data->nc,
data->cnonce,
data->qop,
dest, /* initialized to H(A2) first */
};
http_create_hash(dest, h_a2_strings, ARRAY_SIZE(h_a2_strings));
http_create_hash(dest, resp_strings, ARRAY_SIZE(resp_strings));
}
|
