X-Git-Url: https://git.distorted.org.uk/u/mdw/putty/blobdiff_plain/3709bfe9981af43e3cd491c37d300b57e5b26d50..d8770b1245ff0acd81f581c5667563e0d127104a:/sshbn.c

diff --git a/sshbn.c b/sshbn.c
index aea5a82b..3a5ddc03 100644
--- a/sshbn.c
+++ b/sshbn.c
@@ -6,6 +6,14 @@
 #include <stdlib.h>
 #include <string.h>
 
+#if 0 // use PuTTY main debugging for diagbn()
+#include <windows.h>
+#include "putty.h"
+#define debugprint debug
+#else
+#define debugprint(x) printf x
+#endif
+
 #define BIGNUM_INTERNAL
 typedef unsigned short *Bignum;
 
@@ -289,7 +297,7 @@ Bignum modmul(Bignum p, Bignum q, Bignum mod)
 {
     unsigned short *a, *n, *m, *o;
     int mshift;
-    int pqlen, mlen, i, j;
+    int pqlen, mlen, rlen, i, j;
     Bignum result;
 
     /* Allocate m of size mlen, copy mod to m */
@@ -339,9 +347,10 @@ Bignum modmul(Bignum p, Bignum q, Bignum mod)
     }
 
     /* Copy result to buffer */
-    result = newbn(mod[0]);
-    for (i = 0; i < mlen; i++)
-	result[result[0] - i] = a[i+2*pqlen-mlen];
+    rlen = (mlen < pqlen*2 ? mlen : pqlen*2);
+    result = newbn(rlen);
+    for (i = 0; i < rlen; i++)
+	result[result[0] - i] = a[i+2*pqlen-rlen];
     while (result[0] > 1 && result[result[0]] == 0) result[0]--;
 
     /* Free temporary arrays */
@@ -713,15 +722,15 @@ void diagbn(char *prefix, Bignum md) {
     int i, nibbles, morenibbles;
     static const char hex[] = "0123456789ABCDEF";
 
-    printf("%s0x", prefix ? prefix : "");
+    debugprint(("%s0x", prefix ? prefix : ""));
 
     nibbles = (3 + ssh1_bignum_bitcount(md))/4; if (nibbles<1) nibbles=1;
     morenibbles = 4*md[0] - nibbles;
-    for (i=0; i<morenibbles; i++) putchar('-');
+    for (i=0; i<morenibbles; i++) debugprint(("-"));
     for (i=nibbles; i-- ;)
-        putchar(hex[(bignum_byte(md, i/2) >> (4*(i%2))) & 0xF]);
+        debugprint(("%c",hex[(bignum_byte(md, i/2) >> (4*(i%2))) & 0xF]));
 
-    if (prefix) putchar('\n');
+    if (prefix) debugprint(("\n"));
 }
 
 /*