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fix bn_expand2

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This commit is contained in:
Bodo Möller 2002-08-02 18:23:55 +00:00
parent 848c849584
commit 33d4e690cc
1 changed files with 11 additions and 8 deletions
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19
crypto/bn/bn_lib.c
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@ -425,7 +425,7 @@ BIGNUM *bn_dup_expand(const BIGNUM *b, int words)
/* This is an internal function that should not be used in applications. /* This is an internal function that should not be used in applications.
* It ensures that 'b' has enough room for a 'words' word number * It ensures that 'b' has enough room for a 'words' word number
* and initialises the unused part of b->d with leading zeros. * and initialises any unused part of b->d with leading zeros.
* It is mostly used by the various BIGNUM routines. If there is an error, * It is mostly used by the various BIGNUM routines. If there is an error,
* NULL is returned. If not, 'b' is returned. */ * NULL is returned. If not, 'b' is returned. */
@ -450,15 +450,18 @@ BIGNUM *bn_expand2(BIGNUM *b, int words)
} }
/* NB: bn_wexpand() calls this only if the BIGNUM really has to grow */ /* NB: bn_wexpand() calls this only if the BIGNUM really has to grow */
A = &(b->d[b->top]); if ((b != NULL) && (b->top < b->dmax))
for (i=(words - b->top)>>3; i>0; i--,A+=8)
{ {
A[0]=0; A[1]=0; A[2]=0; A[3]=0; A = &(b->d[b->top]);
A[4]=0; A[5]=0; A[6]=0; A[7]=0; for (i=(words - b->top)>>3; i>0; i--,A+=8)
{
A[0]=0; A[1]=0; A[2]=0; A[3]=0;
A[4]=0; A[5]=0; A[6]=0; A[7]=0;
}
for (i=(words - b->top)&7; i>0; i--,A++)
A[0]=0;
} }
for (i=(words - b->top)&7; i>0; i--,A++)
A[0]=0;
return b; return b;
} }