Commit | Line | Data |
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80a47a2c TK |
1 | /* |
2 | * RFC 1521 base64 encoding/decoding | |
3 | * | |
62d3e98d TK |
4 | * Copyright (C) 2006-2010, Brainspark B.V. |
5 | * | |
6 | * This file is part of PolarSSL (http://www.polarssl.org) | |
7 | * Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org> | |
80a47a2c | 8 | * |
62d3e98d | 9 | * All rights reserved. |
80a47a2c TK |
10 | * |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License along | |
22 | * with this program; if not, write to the Free Software Foundation, Inc., | |
23 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
24 | */ | |
25 | ||
ac3ad426 AM |
26 | #include "polarssl/config.h" |
27 | ||
28 | #if defined(POLARSSL_BASE64_C) | |
29 | ||
30 | #include "polarssl/base64.h" | |
80a47a2c TK |
31 | |
32 | static const unsigned char base64_enc_map[64] = | |
33 | { | |
34 | 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', | |
35 | 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', | |
36 | 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', | |
37 | 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', | |
38 | 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', | |
39 | 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', | |
40 | '8', '9', '+', '/' | |
41 | }; | |
42 | ||
43 | static const unsigned char base64_dec_map[128] = | |
44 | { | |
45 | 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, | |
46 | 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, | |
47 | 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, | |
48 | 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, | |
49 | 127, 127, 127, 62, 127, 127, 127, 63, 52, 53, | |
50 | 54, 55, 56, 57, 58, 59, 60, 61, 127, 127, | |
51 | 127, 64, 127, 127, 127, 0, 1, 2, 3, 4, | |
52 | 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, | |
53 | 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, | |
54 | 25, 127, 127, 127, 127, 127, 127, 26, 27, 28, | |
55 | 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, | |
56 | 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, | |
57 | 49, 50, 51, 127, 127, 127, 127, 127 | |
58 | }; | |
59 | ||
60 | /* | |
61 | * Encode a buffer into base64 format | |
62 | */ | |
63 | int base64_encode( unsigned char *dst, int *dlen, | |
62d3e98d | 64 | const unsigned char *src, int slen ) |
80a47a2c TK |
65 | { |
66 | int i, n; | |
67 | int C1, C2, C3; | |
68 | unsigned char *p; | |
69 | ||
70 | if( slen == 0 ) | |
71 | return( 0 ); | |
72 | ||
73 | n = (slen << 3) / 6; | |
74 | ||
75 | switch( (slen << 3) - (n * 6) ) | |
76 | { | |
77 | case 2: n += 3; break; | |
78 | case 4: n += 2; break; | |
79 | default: break; | |
80 | } | |
81 | ||
82 | if( *dlen < n + 1 ) | |
83 | { | |
84 | *dlen = n + 1; | |
85 | return( POLARSSL_ERR_BASE64_BUFFER_TOO_SMALL ); | |
86 | } | |
87 | ||
88 | n = (slen / 3) * 3; | |
89 | ||
90 | for( i = 0, p = dst; i < n; i += 3 ) | |
91 | { | |
92 | C1 = *src++; | |
93 | C2 = *src++; | |
94 | C3 = *src++; | |
95 | ||
96 | *p++ = base64_enc_map[(C1 >> 2) & 0x3F]; | |
97 | *p++ = base64_enc_map[(((C1 & 3) << 4) + (C2 >> 4)) & 0x3F]; | |
98 | *p++ = base64_enc_map[(((C2 & 15) << 2) + (C3 >> 6)) & 0x3F]; | |
99 | *p++ = base64_enc_map[C3 & 0x3F]; | |
100 | } | |
101 | ||
102 | if( i < slen ) | |
103 | { | |
104 | C1 = *src++; | |
105 | C2 = ((i + 1) < slen) ? *src++ : 0; | |
106 | ||
107 | *p++ = base64_enc_map[(C1 >> 2) & 0x3F]; | |
108 | *p++ = base64_enc_map[(((C1 & 3) << 4) + (C2 >> 4)) & 0x3F]; | |
109 | ||
110 | if( (i + 1) < slen ) | |
111 | *p++ = base64_enc_map[((C2 & 15) << 2) & 0x3F]; | |
112 | else *p++ = '='; | |
113 | ||
114 | *p++ = '='; | |
115 | } | |
116 | ||
117 | *dlen = p - dst; | |
118 | *p = 0; | |
119 | ||
120 | return( 0 ); | |
121 | } | |
122 | ||
123 | /* | |
124 | * Decode a base64-formatted buffer | |
125 | */ | |
126 | int base64_decode( unsigned char *dst, int *dlen, | |
62d3e98d | 127 | const unsigned char *src, int slen ) |
80a47a2c TK |
128 | { |
129 | int i, j, n; | |
130 | unsigned long x; | |
131 | unsigned char *p; | |
132 | ||
133 | for( i = j = n = 0; i < slen; i++ ) | |
134 | { | |
0f557e90 JH |
135 | unsigned char c = src[i]; |
136 | ||
80a47a2c | 137 | if( ( slen - i ) >= 2 && |
0f557e90 | 138 | c == '\r' && src[i + 1] == '\n' ) |
80a47a2c TK |
139 | continue; |
140 | ||
0f557e90 | 141 | if( c == '\n' || c == ' ' || c == '\t' ) |
80a47a2c TK |
142 | continue; |
143 | ||
0f557e90 | 144 | if( c == '=' && ++j > 2 ) |
80a47a2c TK |
145 | return( POLARSSL_ERR_BASE64_INVALID_CHARACTER ); |
146 | ||
0f557e90 | 147 | if( c > 127 || base64_dec_map[src[i]] == 127 ) |
80a47a2c TK |
148 | return( POLARSSL_ERR_BASE64_INVALID_CHARACTER ); |
149 | ||
0f557e90 | 150 | if( base64_dec_map[c] < 64 && j != 0 ) |
80a47a2c TK |
151 | return( POLARSSL_ERR_BASE64_INVALID_CHARACTER ); |
152 | ||
153 | n++; | |
154 | } | |
155 | ||
156 | if( n == 0 ) | |
157 | return( 0 ); | |
158 | ||
159 | n = ((n * 6) + 7) >> 3; | |
160 | ||
161 | if( *dlen < n ) | |
162 | { | |
163 | *dlen = n; | |
164 | return( POLARSSL_ERR_BASE64_BUFFER_TOO_SMALL ); | |
165 | } | |
166 | ||
167 | for( j = 3, n = x = 0, p = dst; i > 0; i--, src++ ) | |
168 | { | |
0f557e90 JH |
169 | unsigned char c = *src; |
170 | ||
171 | if( c == '\r' || c == '\n' || c == ' ' || c == '\t' ) | |
80a47a2c TK |
172 | continue; |
173 | ||
0f557e90 JH |
174 | j -= ( base64_dec_map[c] == 64 ); |
175 | x = (x << 6) | ( base64_dec_map[c] & 0x3F ); | |
80a47a2c TK |
176 | |
177 | if( ++n == 4 ) | |
178 | { | |
179 | n = 0; | |
180 | if( j > 0 ) *p++ = (unsigned char)( x >> 16 ); | |
181 | if( j > 1 ) *p++ = (unsigned char)( x >> 8 ); | |
182 | if( j > 2 ) *p++ = (unsigned char)( x ); | |
183 | } | |
184 | } | |
185 | ||
186 | *dlen = p - dst; | |
187 | ||
188 | return( 0 ); | |
189 | } | |
ac3ad426 AM |
190 | |
191 | #if defined(POLARSSL_SELF_TEST) | |
192 | ||
193 | #include <string.h> | |
194 | #include <stdio.h> | |
195 | ||
196 | static const unsigned char base64_test_dec[64] = | |
197 | { | |
198 | 0x24, 0x48, 0x6E, 0x56, 0x87, 0x62, 0x5A, 0xBD, | |
199 | 0xBF, 0x17, 0xD9, 0xA2, 0xC4, 0x17, 0x1A, 0x01, | |
200 | 0x94, 0xED, 0x8F, 0x1E, 0x11, 0xB3, 0xD7, 0x09, | |
201 | 0x0C, 0xB6, 0xE9, 0x10, 0x6F, 0x22, 0xEE, 0x13, | |
202 | 0xCA, 0xB3, 0x07, 0x05, 0x76, 0xC9, 0xFA, 0x31, | |
203 | 0x6C, 0x08, 0x34, 0xFF, 0x8D, 0xC2, 0x6C, 0x38, | |
204 | 0x00, 0x43, 0xE9, 0x54, 0x97, 0xAF, 0x50, 0x4B, | |
205 | 0xD1, 0x41, 0xBA, 0x95, 0x31, 0x5A, 0x0B, 0x97 | |
206 | }; | |
207 | ||
208 | static const unsigned char base64_test_enc[] = | |
209 | "JEhuVodiWr2/F9mixBcaAZTtjx4Rs9cJDLbpEG8i7hPK" | |
210 | "swcFdsn6MWwINP+Nwmw4AEPpVJevUEvRQbqVMVoLlw=="; | |
211 | ||
212 | /* | |
213 | * Checkup routine | |
214 | */ | |
215 | int base64_self_test( int verbose ) | |
216 | { | |
217 | int len; | |
218 | unsigned char *src, buffer[128]; | |
219 | ||
220 | if( verbose != 0 ) | |
221 | printf( " Base64 encoding test: " ); | |
222 | ||
223 | len = sizeof( buffer ); | |
224 | src = (unsigned char *) base64_test_dec; | |
225 | ||
226 | if( base64_encode( buffer, &len, src, 64 ) != 0 || | |
227 | memcmp( base64_test_enc, buffer, 88 ) != 0 ) | |
228 | { | |
229 | if( verbose != 0 ) | |
230 | printf( "failed\n" ); | |
231 | ||
232 | return( 1 ); | |
233 | } | |
234 | ||
235 | if( verbose != 0 ) | |
236 | printf( "passed\n Base64 decoding test: " ); | |
237 | ||
238 | len = sizeof( buffer ); | |
239 | src = (unsigned char *) base64_test_enc; | |
240 | ||
241 | if( base64_decode( buffer, &len, src, 88 ) != 0 || | |
242 | memcmp( base64_test_dec, buffer, 64 ) != 0 ) | |
243 | { | |
244 | if( verbose != 0 ) | |
245 | printf( "failed\n" ); | |
246 | ||
247 | return( 1 ); | |
248 | } | |
249 | ||
250 | if( verbose != 0 ) | |
251 | printf( "passed\n\n" ); | |
252 | ||
253 | return( 0 ); | |
254 | } | |
255 | ||
256 | #endif | |
257 | ||
258 | #endif |