This probably fixes a BN_rshift bug.

diff --git a/crypto/bn/bn_shift.c b/crypto/bn/bn_shift.c
index 61aae65a6bfce8f86f7e4b358ee54bf16f613baf..0883247384e97a4d8ac9c37f83c4c4a21cb49b96 100644 (file)
--- a/crypto/bn/bn_shift.c
+++ b/crypto/bn/bn_shift.c
@@ -162,7 +162,7 @@ int BN_rshift(BIGNUM *r, BIGNUM *a, int n)
        nw=n/BN_BITS2;
        rb=n%BN_BITS2;
        lb=BN_BITS2-rb;
-       if (nw > a->top)
+       if (nw > a->top || a->top == 0)
                {
                BN_zero(r);
                return(1);