nhyatt/putty-source
1
0
Fork 0
mirror of https://git.tartarus.org/simon/putty.git synced 2025-07-02 03:52:49 -05:00
Code Issues Projects Releases Wiki Activity

Add some missing invariants in bigdiv and bigmod.

Browse Source 
The underlying function 'bigdivmod' does not ensure either of its
outputs is normalised, so its callers must do so.
This commit is contained in:
Simon Tatham
2014-11-01 19:20:51 +00:00
parent df87cb9dfc
commit eac7e041f1
1 changed files with 6 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
sshbn.c
View File

@ -1610,6 +1610,8 @@ Bignum bigdiv(Bignum a, Bignum b)
{
Bignum q = newbn(a[0]);
bigdivmod(a, b, NULL, q);
while (q[0] > 1 && q[q[0]] == 0)
q[0]--;
return q;
}
@ -1620,6 +1622,8 @@ Bignum bigmod(Bignum a, Bignum b)
{
Bignum r = newbn(b[0]);
bigdivmod(a, b, r, NULL);
while (r[0] > 1 && r[r[0]] == 0)
r[0]--;
return r;
}
@ -1679,6 +1683,8 @@ Bignum modinv(Bignum number, Bignum modulus)
bigdivmod(a, b, t, q);
while (t[0] > 1 && t[t[0]] == 0)
t[0]--;
while (q[0] > 1 && q[q[0]] == 0)
q[0]--;
freebn(a);
a = b;
b = t;