X-Git-Url: http://git.silcnet.org/gitweb/?a=blobdiff_plain;f=lib%2Fsilcmath%2Fmpbin.c;h=29d80f7711e71e007b2ddb8d20dde27fd766cd9d;hb=a818c5b5411bbc4436d1c5f011236985c96bb787;hp=3e8cc6132de94b46626fbd2369aa6d4d9e386148;hpb=3801db8c41948715d6042a80883e30b23a55e22b;p=silc.git

diff --git a/lib/silcmath/mpbin.c b/lib/silcmath/mpbin.c
index 3e8cc613..29d80f77 100644
--- a/lib/silcmath/mpbin.c
+++ b/lib/silcmath/mpbin.c
@@ -4,7 +4,7 @@
 
   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
@@ -17,41 +17,66 @@
   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, SilcUInt32 len,
+			      SilcUInt32 *ret_len)
 {
   int i;
-  unsigned int size;
+  SilcUInt32 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,
+			    SilcUInt32 dst_len)
+{
+  int i;
+  SilcUInt32 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, SilcUInt32 len, SilcMPInt *ret)
 {
   int i;