cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
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base64.c (1940B)

      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 2.1 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
     25static const char *base64_valid_chars =
     26    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\n";
     27
     28uint8_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}