1 /* $NetBSD: base64.c,v 1.2 2017/04/18 17:28:18 maya Exp $ */
2
3 /*-
4 * Copyright (c) 2005,2006,2011 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Wasabi Systems, Inc.
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 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31 /*
32 * Adapted for kernel mode use with minimal changes from
33 * /usr/src/crypto/dist/heimdal/lib/roken/base64.c
34 *
35 * Original:
36 * Copyright (c) 1995-2001 Kungliga Tekniska H�gskolan
37 * (Royal Institute of Technology, Stockholm, Sweden).
38 * All rights reserved.
39 *
40 * Redistribution and use in source and binary forms, with or without
41 * modification, are permitted provided that the following conditions
42 * are met:
43 *
44 * 1. Redistributions of source code must retain the above copyright
45 * notice, this list of conditions and the following disclaimer.
46 *
47 * 2. Redistributions in binary form must reproduce the above copyright
48 * notice, this list of conditions and the following disclaimer in the
49 * documentation and/or other materials provided with the distribution.
50 *
51 * 3. Neither the name of the Institute nor the names of its contributors
52 * may be used to endorse or promote products derived from this software
53 * without specific prior written permission.
54 *
55 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
58 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
65 * SUCH DAMAGE.
66 */
67
68 #include "iscsi_globals.h"
69 #include "base64.h"
70
71 static char base64_chars[] =
72 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
73
74 static int
pos(char c)75 pos(char c)
76 {
77 char *p;
78
79 for (p = base64_chars; *p; p++) {
80 if (*p == c) {
81 return (int)(p - base64_chars);
82 }
83 }
84 return -1;
85 }
86
87 int
base64_encode(const void * data,int size,uint8_t * buffer)88 base64_encode(const void *data, int size, uint8_t * buffer)
89 {
90 uint8_t *p;
91 int i;
92 int c;
93 const uint8_t *q;
94
95 p = buffer;
96 q = (const uint8_t *) data;
97 *p++ = '0';
98 *p++ = 'b';
99
100 for (i = 0; i < size;) {
101 c = q[i++];
102 c *= 256;
103 if (i < size) {
104 c += q[i];
105 }
106 i++;
107 c *= 256;
108 if (i < size) {
109 c += q[i];
110 }
111 i++;
112 p[0] = base64_chars[(c & 0x00fc0000) >> 18];
113 p[1] = base64_chars[(c & 0x0003f000) >> 12];
114 p[2] = base64_chars[(c & 0x00000fc0) >> 6];
115 p[3] = base64_chars[(c & 0x0000003f) >> 0];
116 if (i > size) {
117 p[3] = '=';
118 }
119 if (i > size + 1) {
120 p[2] = '=';
121 }
122 p += 4;
123 }
124 *p = 0;
125 return strlen(buffer);
126 }
127
128 #define DECODE_ERROR 0xffffffff
129
130 static uint32_t
token_decode(uint8_t * token)131 token_decode(uint8_t * token)
132 {
133 int i;
134 uint32_t val = 0;
135 int marker = 0;
136
137 if (strlen(token) < 4) {
138 return DECODE_ERROR;
139 }
140 for (i = 0; i < 4; i++) {
141 val *= 64;
142 if (token[i] == '=') {
143 marker++;
144 } else if (marker > 0) {
145 return DECODE_ERROR;
146 } else {
147 val += pos(token[i]);
148 }
149 }
150 if (marker > 2) {
151 return DECODE_ERROR;
152 }
153 return (marker << 24) | val;
154 }
155
156
157 uint8_t *
base64_decode(uint8_t * str,void * data,int * datalen)158 base64_decode(uint8_t * str, void *data, int *datalen)
159 {
160 uint8_t *p, *q;
161 uint32_t marker = 0;
162
163 q = data;
164 for (p = str; *p; p += 4) {
165 uint32_t val = token_decode(p);
166 marker = (val >> 24) & 0xff;
167 if (val == DECODE_ERROR) {
168 return NULL;
169 }
170 *q++ = (val >> 16) & 0xff;
171 if (marker < 2) {
172 *q++ = (val >> 8) & 0xff;
173 }
174 if (marker < 1) {
175 *q++ = val & 0xff;
176 }
177 }
178 *datalen = (int)(q - (uint8_t *) data);
179
180 return p - marker + 1;
181 }
182