px5g: rename the old package to px5g-standalone, add a new one that links against...
[openwrt/svn-archive/archive.git] / package / utils / px5g-standalone / src / library / base64.c
1 /*
2 * RFC 1521 base64 encoding/decoding
3 *
4 * Based on XySSL: Copyright (C) 2006-2008 Christophe Devine
5 *
6 * Copyright (C) 2009 Paul Bakker <polarssl_maintainer at polarssl dot org>
7 *
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 *
14 * * Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * * Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * * Neither the names of PolarSSL or XySSL nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
24 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
26 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
27 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
29 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
30 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35
36 #include "polarssl/config.h"
37
38 #if defined(POLARSSL_BASE64_C)
39
40 #include "polarssl/base64.h"
41
42 static const unsigned char base64_enc_map[64] =
43 {
44 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',
45 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T',
46 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd',
47 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
48 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x',
49 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7',
50 '8', '9', '+', '/'
51 };
52
53 static const unsigned char base64_dec_map[128] =
54 {
55 127, 127, 127, 127, 127, 127, 127, 127, 127, 127,
56 127, 127, 127, 127, 127, 127, 127, 127, 127, 127,
57 127, 127, 127, 127, 127, 127, 127, 127, 127, 127,
58 127, 127, 127, 127, 127, 127, 127, 127, 127, 127,
59 127, 127, 127, 62, 127, 127, 127, 63, 52, 53,
60 54, 55, 56, 57, 58, 59, 60, 61, 127, 127,
61 127, 64, 127, 127, 127, 0, 1, 2, 3, 4,
62 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
63 15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
64 25, 127, 127, 127, 127, 127, 127, 26, 27, 28,
65 29, 30, 31, 32, 33, 34, 35, 36, 37, 38,
66 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
67 49, 50, 51, 127, 127, 127, 127, 127
68 };
69
70 /*
71 * Encode a buffer into base64 format
72 */
73 int base64_encode( unsigned char *dst, int *dlen,
74 unsigned char *src, int slen )
75 {
76 int i, n;
77 int C1, C2, C3;
78 unsigned char *p;
79
80 if( slen == 0 )
81 return( 0 );
82
83 n = (slen << 3) / 6;
84
85 switch( (slen << 3) - (n * 6) )
86 {
87 case 2: n += 3; break;
88 case 4: n += 2; break;
89 default: break;
90 }
91
92 if( *dlen < n + 1 )
93 {
94 *dlen = n + 1;
95 return( POLARSSL_ERR_BASE64_BUFFER_TOO_SMALL );
96 }
97
98 n = (slen / 3) * 3;
99
100 for( i = 0, p = dst; i < n; i += 3 )
101 {
102 C1 = *src++;
103 C2 = *src++;
104 C3 = *src++;
105
106 *p++ = base64_enc_map[(C1 >> 2) & 0x3F];
107 *p++ = base64_enc_map[(((C1 & 3) << 4) + (C2 >> 4)) & 0x3F];
108 *p++ = base64_enc_map[(((C2 & 15) << 2) + (C3 >> 6)) & 0x3F];
109 *p++ = base64_enc_map[C3 & 0x3F];
110 }
111
112 if( i < slen )
113 {
114 C1 = *src++;
115 C2 = ((i + 1) < slen) ? *src++ : 0;
116
117 *p++ = base64_enc_map[(C1 >> 2) & 0x3F];
118 *p++ = base64_enc_map[(((C1 & 3) << 4) + (C2 >> 4)) & 0x3F];
119
120 if( (i + 1) < slen )
121 *p++ = base64_enc_map[((C2 & 15) << 2) & 0x3F];
122 else *p++ = '=';
123
124 *p++ = '=';
125 }
126
127 *dlen = p - dst;
128 *p = 0;
129
130 return( 0 );
131 }
132
133 /*
134 * Decode a base64-formatted buffer
135 */
136 int base64_decode( unsigned char *dst, int *dlen,
137 unsigned char *src, int slen )
138 {
139 int i, j, n;
140 unsigned long x;
141 unsigned char *p;
142
143 for( i = j = n = 0; i < slen; i++ )
144 {
145 if( ( slen - i ) >= 2 &&
146 src[i] == '\r' && src[i + 1] == '\n' )
147 continue;
148
149 if( src[i] == '\n' )
150 continue;
151
152 if( src[i] == '=' && ++j > 2 )
153 return( POLARSSL_ERR_BASE64_INVALID_CHARACTER );
154
155 if( src[i] > 127 || base64_dec_map[src[i]] == 127 )
156 return( POLARSSL_ERR_BASE64_INVALID_CHARACTER );
157
158 if( base64_dec_map[src[i]] < 64 && j != 0 )
159 return( POLARSSL_ERR_BASE64_INVALID_CHARACTER );
160
161 n++;
162 }
163
164 if( n == 0 )
165 return( 0 );
166
167 n = ((n * 6) + 7) >> 3;
168
169 if( *dlen < n )
170 {
171 *dlen = n;
172 return( POLARSSL_ERR_BASE64_BUFFER_TOO_SMALL );
173 }
174
175 for( j = 3, n = x = 0, p = dst; i > 0; i--, src++ )
176 {
177 if( *src == '\r' || *src == '\n' )
178 continue;
179
180 j -= ( base64_dec_map[*src] == 64 );
181 x = (x << 6) | ( base64_dec_map[*src] & 0x3F );
182
183 if( ++n == 4 )
184 {
185 n = 0;
186 if( j > 0 ) *p++ = (unsigned char)( x >> 16 );
187 if( j > 1 ) *p++ = (unsigned char)( x >> 8 );
188 if( j > 2 ) *p++ = (unsigned char)( x );
189 }
190 }
191
192 *dlen = p - dst;
193
194 return( 0 );
195 }
196
197 #if defined(POLARSSL_SELF_TEST)
198
199 #include <string.h>
200 #include <stdio.h>
201
202 static const unsigned char base64_test_dec[64] =
203 {
204 0x24, 0x48, 0x6E, 0x56, 0x87, 0x62, 0x5A, 0xBD,
205 0xBF, 0x17, 0xD9, 0xA2, 0xC4, 0x17, 0x1A, 0x01,
206 0x94, 0xED, 0x8F, 0x1E, 0x11, 0xB3, 0xD7, 0x09,
207 0x0C, 0xB6, 0xE9, 0x10, 0x6F, 0x22, 0xEE, 0x13,
208 0xCA, 0xB3, 0x07, 0x05, 0x76, 0xC9, 0xFA, 0x31,
209 0x6C, 0x08, 0x34, 0xFF, 0x8D, 0xC2, 0x6C, 0x38,
210 0x00, 0x43, 0xE9, 0x54, 0x97, 0xAF, 0x50, 0x4B,
211 0xD1, 0x41, 0xBA, 0x95, 0x31, 0x5A, 0x0B, 0x97
212 };
213
214 static const unsigned char base64_test_enc[] =
215 "JEhuVodiWr2/F9mixBcaAZTtjx4Rs9cJDLbpEG8i7hPK"
216 "swcFdsn6MWwINP+Nwmw4AEPpVJevUEvRQbqVMVoLlw==";
217
218 /*
219 * Checkup routine
220 */
221 int base64_self_test( int verbose )
222 {
223 int len;
224 unsigned char *src, buffer[128];
225
226 if( verbose != 0 )
227 printf( " Base64 encoding test: " );
228
229 len = sizeof( buffer );
230 src = (unsigned char *) base64_test_dec;
231
232 if( base64_encode( buffer, &len, src, 64 ) != 0 ||
233 memcmp( base64_test_enc, buffer, 88 ) != 0 )
234 {
235 if( verbose != 0 )
236 printf( "failed\n" );
237
238 return( 1 );
239 }
240
241 if( verbose != 0 )
242 printf( "passed\n Base64 decoding test: " );
243
244 len = sizeof( buffer );
245 src = (unsigned char *) base64_test_enc;
246
247 if( base64_decode( buffer, &len, src, 88 ) != 0 ||
248 memcmp( base64_test_dec, buffer, 64 ) != 0 )
249 {
250 if( verbose != 0 )
251 printf( "failed\n" );
252
253 return( 1 );
254 }
255
256 if( verbose != 0 )
257 printf( "passed\n\n" );
258
259 return( 0 );
260 }
261
262 #endif
263
264 #endif