Change DH_up() -> DH_up_ref()

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

diff --git a/crypto/bn/bn_shift.c b/crypto/bn/bn_shift.c
index 0883247384e97a4d8ac9c37f83c4c4a21cb49b96..70f785ea185b8841e415d33b385bf96de95535be 100644 (file)
--- a/crypto/bn/bn_shift.c
+++ b/crypto/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;
@@ -172,6 +172,11 @@ int BN_rshift(BIGNUM *r, BIGNUM *a, int n)
                r->neg=a->neg;
                if (bn_wexpand(r,a->top-nw+1) == NULL) return(0);
                }
+       else
+               {
+               if (n == 0)
+                       return 1; /* or the copying loop will go berserk */
+               }
 
        f= &(a->d[nw]);
        t=r->d;