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Fallback to normal multiply if n2 == 8 and dna or dnb is not zero

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in bn_mul_recursive.

This is (hopefully) what was triggering bignum errors on 64 bit
platforms and causing the BN_mod_mul test to fail.
This commit is contained in:
Dr. Stephen Henson 2002-05-10 22:22:55 +00:00
parent f9bd76e4f7
commit 1c511bdb7c
2 changed files with 14 additions and 3 deletions
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5
CHANGES
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@ -4,6 +4,11 @@
Changes between 0.9.6d and 0.9.7 [XX xxx 2002]
*) Check the values of dna and dnb in bn_mul_recursive before calling
bn_mul_comba (a non zero value means the a or b arrays do not contain
n2 elements) and fallback to bn_mul_normal if either is not zero.
[Steve Henson]
*) Fix escaping of non-ASCII characters when using the -subj option
of the "openssl req" command line tool. (Robert Joop <joop@fokus.gmd.de>)
[Lutz Jaenicke]

12
crypto/bn/bn_mul.c
View file

@ -408,16 +408,22 @@ void bn_mul_recursive(BN_ULONG *r, BN_ULONG *a, BN_ULONG *b, int n2,
return;
}
# endif
if (n2 == 8)
/* Only call bn_mul_comba 8 if n2 == 8 and the
* two arrays are complete [steve]
*/
if (n2 == 8 && dna == 0 && dnb == 0)
{
bn_mul_comba8(r,a,b);
return;
}
# endif /* BN_MUL_COMBA */
/* Else do normal multiply */
if (n2 < BN_MUL_RECURSIVE_SIZE_NORMAL)
{
/* This should not happen */
bn_mul_normal(r,a,n2,b,n2);
bn_mul_normal(r,a,n2+dna,b,n2+dnb);
if ((dna + dnb) < 0)
memset(&r[2*n2 + dna + dnb], 0,
sizeof(BN_ULONG) * -(dna + dnb));
return;
}
/* r=(a[0]-a[1])*(b[1]-b[0]) */