Actually, that last change to BN_get_word() was a little too simple.

diff --git a/crypto/bn/bn_lib.c b/crypto/bn/bn_lib.c
index 8aa817dfc682fbb1eaed064bf5be9fd057ea2cc4..bbc359cb7859eb88bd9161c7dfbb44304e902fc4 100644 (file)
--- a/crypto/bn/bn_lib.c
+++ b/crypto/bn/bn_lib.c
@@ -618,8 +618,10 @@ BN_ULONG BN_get_word(const BIGNUM *a)
        {
        if (a->top > 1)
                return BN_MASK2;
-       else
+       else if (a->top == 1)
                return a->d[0];
+       /* a->top == 0 */
+       return 0;
        }
 
 int BN_set_word(BIGNUM *a, BN_ULONG w)