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As Nils put it;

Browse Source 
Yet another question: some time ago you changed BN_set_word.
    Why didn't you change BN_get_word as well?

Quite. I'm also removing the older commented-out implementations to improve
readability. This complex stuff seems to date from a time when the types
didn't match up well.

Submitted by: Nils Larsch, Geoff Thorpe
This commit is contained in:
Geoff Thorpe 2004-06-17 20:13:50 +00:00
parent cf9056cfda
commit 9088d5f24f
1 changed files with 4 additions and 48 deletions
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52
crypto/bn/bn_lib.c
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@ -616,55 +616,12 @@ void BN_clear(BIGNUM *a)
BN_ULONG BN_get_word(const BIGNUM *a)
{
int i,n;
BN_ULONG ret=0;
n=BN_num_bytes(a);
if (n > (int)sizeof(BN_ULONG))
return(BN_MASK2);
for (i=a->top-1; i>=0; i--)
{
#ifndef SIXTY_FOUR_BIT /* the data item > unsigned long */
ret<<=BN_BITS4; /* stops the compiler complaining */
ret<<=BN_BITS4;
#else
ret=0;
#endif
ret|=a->d[i];
}
return(ret);
if (a->top > 1)
return BN_MASK2;
else
return a->d[0];
}
#if 0 /* a->d[0] is a BN_ULONG, w is a BN_ULONG, what's the big deal? */
int BN_set_word(BIGNUM *a, BN_ULONG w)
{
int i,n;
bn_check_top(a);
if (bn_expand(a,(int)sizeof(BN_ULONG)*8) == NULL) return(0);
n=sizeof(BN_ULONG)/BN_BYTES;
a->neg=0;
a->top=0;
a->d[0]=(BN_ULONG)w&BN_MASK2;
if (a->d[0] != 0) a->top=1;
for (i=1; i<n; i++)
{
/* the following is done instead of
* w>>=BN_BITS2 so compilers don't complain
* on builds where sizeof(long) == BN_TYPES */
#ifndef SIXTY_FOUR_BIT /* the data item > unsigned long */
w>>=BN_BITS4;
w>>=BN_BITS4;
#else
w=0;
#endif
a->d[i]=(BN_ULONG)w&BN_MASK2;
if (a->d[i] != 0) a->top=i+1;
}
bn_check_top(a);
return(1);
}
#else
int BN_set_word(BIGNUM *a, BN_ULONG w)
{
bn_check_top(a);
@ -675,7 +632,6 @@ int BN_set_word(BIGNUM *a, BN_ULONG w)
bn_check_top(a);
return(1);
}
#endif
BIGNUM *BN_bin2bn(const unsigned char *s, int len, BIGNUM *ret)
{