hostapd: Update vendor branch to 0.6.10
[dragonfly.git] / contrib / hostapd / src / utils / base64.c
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a875087d
JL
1/*
2 * Base64 encoding/decoding (RFC1341)
3 * Copyright (c) 2005, Jouni Malinen <j@w1.fi>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * Alternatively, this software may be distributed under the terms of BSD
10 * license.
11 *
12 * See README and COPYING for more details.
13 */
14
15#include "includes.h"
16
17#include "os.h"
18#include "base64.h"
19
20static const unsigned char base64_table[65] =
21 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
22
23/**
24 * base64_encode - Base64 encode
25 * @src: Data to be encoded
26 * @len: Length of the data to be encoded
27 * @out_len: Pointer to output length variable, or %NULL if not used
28 * Returns: Allocated buffer of out_len bytes of encoded data,
29 * or %NULL on failure
30 *
31 * Caller is responsible for freeing the returned buffer. Returned buffer is
32 * nul terminated to make it easier to use as a C string. The nul terminator is
33 * not included in out_len.
34 */
35unsigned char * base64_encode(const unsigned char *src, size_t len,
36 size_t *out_len)
37{
38 unsigned char *out, *pos;
39 const unsigned char *end, *in;
40 size_t olen;
41 int line_len;
42
43 olen = len * 4 / 3 + 4; /* 3-byte blocks to 4-byte */
44 olen += olen / 72; /* line feeds */
45 olen++; /* nul termination */
46 if (olen < len)
47 return NULL; /* integer overflow */
48 out = os_malloc(olen);
49 if (out == NULL)
50 return NULL;
51
52 end = src + len;
53 in = src;
54 pos = out;
55 line_len = 0;
56 while (end - in >= 3) {
57 *pos++ = base64_table[in[0] >> 2];
58 *pos++ = base64_table[((in[0] & 0x03) << 4) | (in[1] >> 4)];
59 *pos++ = base64_table[((in[1] & 0x0f) << 2) | (in[2] >> 6)];
60 *pos++ = base64_table[in[2] & 0x3f];
61 in += 3;
62 line_len += 4;
63 if (line_len >= 72) {
64 *pos++ = '\n';
65 line_len = 0;
66 }
67 }
68
69 if (end - in) {
70 *pos++ = base64_table[in[0] >> 2];
71 if (end - in == 1) {
72 *pos++ = base64_table[(in[0] & 0x03) << 4];
73 *pos++ = '=';
74 } else {
75 *pos++ = base64_table[((in[0] & 0x03) << 4) |
76 (in[1] >> 4)];
77 *pos++ = base64_table[(in[1] & 0x0f) << 2];
78 }
79 *pos++ = '=';
80 line_len += 4;
81 }
82
83 if (line_len)
84 *pos++ = '\n';
85
86 *pos = '\0';
87 if (out_len)
88 *out_len = pos - out;
89 return out;
90}
91
92
93/**
94 * base64_decode - Base64 decode
95 * @src: Data to be decoded
96 * @len: Length of the data to be decoded
97 * @out_len: Pointer to output length variable
98 * Returns: Allocated buffer of out_len bytes of decoded data,
99 * or %NULL on failure
100 *
101 * Caller is responsible for freeing the returned buffer.
102 */
103unsigned char * base64_decode(const unsigned char *src, size_t len,
104 size_t *out_len)
105{
106 unsigned char dtable[256], *out, *pos, in[4], block[4], tmp;
107 size_t i, count, olen;
108
109 os_memset(dtable, 0x80, 256);
110 for (i = 0; i < sizeof(base64_table) - 1; i++)
111 dtable[base64_table[i]] = (unsigned char) i;
112 dtable['='] = 0;
113
114 count = 0;
115 for (i = 0; i < len; i++) {
116 if (dtable[src[i]] != 0x80)
117 count++;
118 }
119
120 if (count == 0 || count % 4)
121 return NULL;
122
123 olen = count / 4 * 3;
124 pos = out = os_malloc(olen);
125 if (out == NULL)
126 return NULL;
127
128 count = 0;
129 for (i = 0; i < len; i++) {
130 tmp = dtable[src[i]];
131 if (tmp == 0x80)
132 continue;
133
134 in[count] = src[i];
135 block[count] = tmp;
136 count++;
137 if (count == 4) {
138 *pos++ = (block[0] << 2) | (block[1] >> 4);
139 *pos++ = (block[1] << 4) | (block[2] >> 2);
140 *pos++ = (block[2] << 6) | block[3];
141 count = 0;
142 }
143 }
144
145 if (pos > out) {
146 if (in[2] == '=')
147 pos -= 2;
148 else if (in[3] == '=')
149 pos--;
150 }
151
152 *out_len = pos - out;
153 return out;
154}
155
156
157#ifdef TEST_MAIN
158
159int main(int argc, char *argv[])
160{
161 FILE *f;
162 size_t len, elen;
163 unsigned char *buf, *e;
164
165 if (argc != 4) {
166 printf("Usage: base64 <encode|decode> <in file> <out file>\n");
167 return -1;
168 }
169
170 buf = os_readfile(argv[2], &len);
171 if (buf == NULL)
172 return -1;
173
174 if (strcmp(argv[1], "encode") == 0)
175 e = base64_encode(buf, len, &elen);
176 else
177 e = base64_decode(buf, len, &elen);
178 if (e == NULL)
179 return -2;
180 f = fopen(argv[3], "w");
181 if (f == NULL)
182 return -3;
183 fwrite(e, 1, elen, f);
184 fclose(f);
185 free(e);
186
187 return 0;
188}
189#endif /* TEST_MAIN */