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Fix some handling in bn_word. This also resolves the issues observed in

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ticket 697 (though uses a different solution than the proposed one). This
problem was initially raised by Otto Moerbeek.

PR: 697
Submitted by: Nils Larsch
Reviewed by: Geoff Thorpe
This commit is contained in:
Geoff Thorpe 2003-11-25 20:39:19 +00:00
parent e1064adfd3
commit 6defae04f3
1 changed files with 19 additions and 6 deletions
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25
crypto/bn/bn_word.c
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@ -85,12 +85,17 @@ BN_ULONG BN_mod_word(const BIGNUM *a, BN_ULONG w)
BN_ULONG BN_div_word(BIGNUM *a, BN_ULONG w)
{
BN_ULONG ret;
BN_ULONG ret = 0;
int i;
if (a->top == 0) return(0);
ret=0;
w&=BN_MASK2;
w &= BN_MASK2;
if (!w)
/* actually this an error (division by zero) */
return 0;
if (a->top == 0)
return 0;
for (i=a->top-1; i>=0; i--)
{
BN_ULONG l,d;
@ -111,6 +116,11 @@ int BN_add_word(BIGNUM *a, BN_ULONG w)
BN_ULONG l;
int i;
w &= BN_MASK2;
if (!w)
return 1;
if (a->neg)
{
a->neg=0;
@ -119,7 +129,6 @@ int BN_add_word(BIGNUM *a, BN_ULONG w)
a->neg=!(a->neg);
return(i);
}
w&=BN_MASK2;
if (bn_wexpand(a,a->top+1) == NULL) return(0);
i=0;
for (;;)
@ -145,6 +154,11 @@ int BN_sub_word(BIGNUM *a, BN_ULONG w)
{
int i;
w &= BN_MASK2;
if (!w)
return 1;
if (BN_is_zero(a) || a->neg)
{
a->neg=0;
@ -153,7 +167,6 @@ int BN_sub_word(BIGNUM *a, BN_ULONG w)
return(i);
}
w&=BN_MASK2;
if ((a->top == 1) && (a->d[0] < w))
{
a->d[0]=w-a->d[0];