5 Author: Pekka Riikonen <priikone@poseidon.pspt.fi>
7 Copyright (C) 2000 Pekka Riikonen
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
21 #include "silcincludes.h"
23 /* Encodes MP integer into binary data. Returns allocated data that
24 must be free'd by the caller. */
26 unsigned char *silc_mp_mp2bin(SilcInt *val, unsigned int *ret_len)
33 size = (silc_mp_sizeinbase(val, 2) + 7) / 8;
34 ret = silc_calloc(size, sizeof(*ret));
36 silc_mp_init_set(&tmp, val);
38 for (i = size; i > 0; i--) {
39 ret[i - 1] = (unsigned char)(silc_mp_get_ui(&tmp) & 0xff);
40 silc_mp_fdiv_q_2exp(&tmp, &tmp, 8);
51 /* Decodes binary data into MP integer. The integer sent as argument
52 must be initialized. */
54 void silc_mp_bin2mp(unsigned char *data, unsigned int len, SilcInt *ret)
58 silc_mp_set_ui(ret, 0);
60 for (i = 0; i < len; i++) {
61 silc_mp_mul_2exp(ret, ret, 8);
62 silc_mp_add_ui(ret, ret, data[i]);