Daniel P. Berrange | 89bc0b6 | 2015-11-23 15:24:50 +0000 | [diff] [blame] | 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 |
Chetan Pant | 61f3c91 | 2020-10-23 12:44:24 +0000 | [diff] [blame] | 9 | * version 2.1 of the License, or (at your option) any later version. |
Daniel P. Berrange | 89bc0b6 | 2015-11-23 15:24:50 +0000 | [diff] [blame] | 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 | |
Peter Maydell | aafd758 | 2016-01-29 17:49:55 +0000 | [diff] [blame] | 21 | #include "qemu/osdep.h" |
Markus Armbruster | da34e65 | 2016-03-14 09:01:28 +0100 | [diff] [blame] | 22 | #include "qapi/error.h" |
Daniel P. Berrange | 89bc0b6 | 2015-11-23 15:24:50 +0000 | [diff] [blame] | 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 | } |