1 files changed, 4 insertions, 4 deletions

diff --git a/src/lib/libcrypto/bn/bn_shift.c b/src/lib/libcrypto/bn/bn_shift.c
index c2608f9f4a..70f785ea18 100644
--- a/src/lib/libcrypto/bn/bn_shift.c
+++ b/src/lib/libcrypto/bn/bn_shift.c
@@ -60,7 +60,7 @@
 #include "cryptlib.h"
 #include "bn_lcl.h"
 
-int BN_lshift1(BIGNUM *r, BIGNUM *a)
+int BN_lshift1(BIGNUM *r, const BIGNUM *a)
         {
         register BN_ULONG *ap,*rp,t,c;
         int i;
@@ -92,7 +92,7 @@ int BN_lshift1(BIGNUM *r, BIGNUM *a)
         return(1);
         }
 
-int BN_rshift1(BIGNUM *r, BIGNUM *a)
+int BN_rshift1(BIGNUM *r, const BIGNUM *a)
         {
         BN_ULONG *ap,*rp,t,c;
         int i;
@@ -128,8 +128,8 @@ int BN_lshift(BIGNUM *r, const BIGNUM *a, int n)
         BN_ULONG l;
 
         r->neg=a->neg;
-        if (bn_wexpand(r,a->top+(n/BN_BITS2)+1) == NULL) return(0);
         nw=n/BN_BITS2;
+        if (bn_wexpand(r,a->top+nw+1) == NULL) return(0);
         lb=n%BN_BITS2;
         rb=BN_BITS2-lb;
         f=a->d;
@@ -153,7 +153,7 @@ int BN_lshift(BIGNUM *r, const BIGNUM *a, int n)
         return(1);
         }
 
-int BN_rshift(BIGNUM *r, BIGNUM *a, int n)
+int BN_rshift(BIGNUM *r, const BIGNUM *a, int n)
         {
         int i,j,nw,lb,rb;
         BN_ULONG *t,*f;