This probably fixes a BN_rshift bug.

[openssl.git] / crypto / bn / bn_shift.c

diff --git a/crypto/bn/bn_shift.c b/crypto/bn/bn_shift.c
index 6dbe77b50fdc51e99c456628b255ccaf55d2f1ec..0883247384e97a4d8ac9c37f83c4c4a21cb49b96 100644 (file)
--- a/crypto/bn/bn_shift.c
+++ b/crypto/bn/bn_shift.c
@@ -121,7 +121,7 @@ int BN_rshift1(BIGNUM *r, BIGNUM *a)
        return(1);
        }
 
-int BN_lshift(BIGNUM *r, BIGNUM *a, int n)
+int BN_lshift(BIGNUM *r, const BIGNUM *a, int n)
        {
        int i,nw,lb,rb;
        BN_ULONG *t,*f;
@@ -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);