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75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
/* This file is part of pam-modules.
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Copyright (C) 2008-2022 Sergey Poznyakoff
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <graypam.h>
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static int
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b64_input(char c)
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{
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const char table[64] =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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int i;
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for (i = 0; i < 64; i++) {
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if (table[i] == c)
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return i;
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}
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return -1;
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}
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ssize_t
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gray_base64_decode(gray_slist_t slist, const char *iptr, size_t isize)
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{
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int i = 0, pad = 0;
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size_t consumed = 0;
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ssize_t nbytes;
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unsigned char data[4];
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nbytes = 0;
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while (consumed < isize) {
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while (i < 4 && consumed < isize) {
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int tmp = b64_input(*iptr++);
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consumed++;
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if (tmp != -1)
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data[i++] = tmp;
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else if (iptr[-1] == '=') {
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data[i++] = '\0';
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pad++;
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}
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}
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/* I have a entire block of data 32 bits get the output
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data. */
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if (i == 4) {
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if (gray_slist_append_char(slist,
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(data[0] << 2) | ((data[1] & 0x30) >> 4)) != 1)
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return -1;
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if (gray_slist_append_char(slist,
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((data[1] & 0xf) << 4) | ((data[2] & 0x3c) >> 2))
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!= 1)
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return -1;
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if (gray_slist_append_char(slist,
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((data[2] & 0x3) << 6) | data[3]) != 1)
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return -1;
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nbytes += 3 - pad;
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} else {
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errno = EILSEQ;
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return -1;
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}
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i = 0;
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}
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return nbytes;
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}
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