nhyatt/putty-source
1
0
Fork 0
mirror of https://git.tartarus.org/simon/putty.git synced 2025-03-12 18:13:50 -05:00
Code Issues Projects Releases Wiki Activity

A fix in modmul: don't segfault or fill the result with rubbish if

Browse Source 
the unreduced product is shorter than the modulus.

[originally from svn r965]
This commit is contained in:
Simon Tatham 2001-03-02 10:29:23 +00:00
parent 5f0d3bd19d
commit 47fc223782
1 changed files with 5 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
sshbn.c
View File

@ -289,7 +289,7 @@ 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 +339,10 @@ 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 */