Author: Pekka Riikonen <priikone@poseidon.pspt.fi>
- Copyright (C) 2000 Pekka Riikonen
+ Copyright (C) 2000 - 2001 Pekka Riikonen
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
GNU General Public License for more details.
*/
+/* $Id$ */
#include "silcincludes.h"
/* Encodes MP integer into binary data. Returns allocated data that
- must be free'd by the caller. */
+ must be free'd by the caller. If `len' is provided the destination
+ buffer is allocated that large. If zero then the size is approximated. */
-unsigned char *silc_mp_mp2bin(SilcInt *val, unsigned int *ret_len)
+unsigned char *silc_mp_mp2bin(SilcMPInt *val, uint32 len,
+ uint32 *ret_len)
{
int i;
- unsigned int size;
+ uint32 size;
unsigned char *ret;
- SilcInt tmp;
+ SilcMPInt tmp;
- size = (silc_mp_sizeinbase(val, 2) + 7) / 8;
+ size = (len ? len : ((silc_mp_sizeinbase(val, 2) + 7) / 8));
ret = silc_calloc(size, sizeof(*ret));
-
- silc_mp_init_set(&tmp, val);
+
+ silc_mp_init(&tmp);
+ silc_mp_set(&tmp, val);
for (i = size; i > 0; i--) {
ret[i - 1] = (unsigned char)(silc_mp_get_ui(&tmp) & 0xff);
- silc_mp_fdiv_q_2exp(&tmp, &tmp, 8);
+ silc_mp_div_2exp(&tmp, &tmp, 8);
}
- silc_mp_clear(&tmp);
+ silc_mp_uninit(&tmp);
- if (*ret_len)
+ if (ret_len)
*ret_len = size;
return ret;
}
+/* Samve as above but does not allocate any memory. The encoded data is
+ returned into `dst' and it's length to the `ret_len'. */
+
+void silc_mp_mp2bin_noalloc(SilcMPInt *val, unsigned char *dst,
+ uint32 dst_len)
+{
+ int i;
+ uint32 size = dst_len;
+ SilcMPInt tmp;
+
+ silc_mp_init(&tmp);
+ silc_mp_set(&tmp, val);
+
+ for (i = size; i > 0; i--) {
+ dst[i - 1] = (unsigned char)(silc_mp_get_ui(&tmp) & 0xff);
+ silc_mp_div_2exp(&tmp, &tmp, 8);
+ }
+
+ silc_mp_uninit(&tmp);
+}
+
/* Decodes binary data into MP integer. The integer sent as argument
must be initialized. */
-void silc_mp_bin2mp(unsigned char *data, unsigned int len, SilcInt *ret)
+void silc_mp_bin2mp(unsigned char *data, uint32 len, SilcMPInt *ret)
{
int i;