1 | /* |
2 | * QEMU base64 helpers |
3 | * |
4 | * Copyright (c) 2015 Red Hat, Inc. |
5 | * |
6 | * This library is free software; you can redistribute it and/or |
7 | * modify it under the terms of the GNU Lesser General Public |
8 | * License as published by the Free Software Foundation; either |
9 | * version 2 of the License, or (at your option) any later version. |
10 | * |
11 | * This library is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
14 | * Lesser General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU Lesser General Public |
17 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
18 | * |
19 | */ |
20 | |
21 | #include "qemu/osdep.h" |
22 | #include "qapi/error.h" |
23 | #include "qemu/base64.h" |
24 | |
25 | static const char *base64_valid_chars = |
26 | "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\n" ; |
27 | |
28 | uint8_t *qbase64_decode(const char *input, |
29 | size_t in_len, |
30 | size_t *out_len, |
31 | Error **errp) |
32 | { |
33 | *out_len = 0; |
34 | |
35 | if (in_len != -1) { |
36 | /* Lack of NUL terminator is an error */ |
37 | if (input[in_len] != '\0') { |
38 | error_setg(errp, "Base64 data is not NUL terminated" ); |
39 | return NULL; |
40 | } |
41 | /* Check there's no NULs embedded since we expect |
42 | * this to be valid base64 data */ |
43 | if (memchr(input, '\0', in_len) != NULL) { |
44 | error_setg(errp, "Base64 data contains embedded NUL characters" ); |
45 | return NULL; |
46 | } |
47 | |
48 | /* Now we know its a valid nul terminated string |
49 | * strspn is safe to use... */ |
50 | } else { |
51 | in_len = strlen(input); |
52 | } |
53 | |
54 | if (strspn(input, base64_valid_chars) != in_len) { |
55 | error_setg(errp, "Base64 data contains invalid characters" ); |
56 | return NULL; |
57 | } |
58 | |
59 | return g_base64_decode(input, out_len); |
60 | } |
61 | |