Constify the BIGNUM routines a bit more. The only trouble were the
[openssl.git] / crypto / bn / bn_sqr.c
index 75f4f38..4789f13 100644 (file)
 
 /* r must not be a */
 /* I've just gone over this and it is now %20 faster on x86 - eay - 27 Jun 96 */
-int BN_sqr(BIGNUM *r, BIGNUM *a, BN_CTX *ctx)
+int BN_sqr(BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
        {
        int max,al;
        int ret = 0;
-       BIGNUM *tmp,*rr;
+       BIGNUM *tmp,*rr,*free_a = NULL;
 
 #ifdef BN_COUNT
 printf("BN_sqr %d * %d\n",a->top,a->top);
@@ -124,8 +124,10 @@ printf("BN_sqr %d * %d\n",a->top,a->top);
                        k=j+j;
                        if (al == j)
                                {
-                               if (bn_wexpand(a,k*2) == NULL) goto err;
+                               BIGNUM *tmp_bn = free_a;
+                               if ((a = free_a = bn_dup_expand(a,k*2)) == NULL) goto err;
                                if (bn_wexpand(tmp,k*2) == NULL) goto err;
+                               if (tmp_bn) BN_free(tmp_bn);
                                bn_sqr_recursive(rr->d,a->d,al,tmp->d);
                                }
                        else
@@ -145,6 +147,7 @@ printf("BN_sqr %d * %d\n",a->top,a->top);
        if (rr != r) BN_copy(r,rr);
        ret = 1;
  err:
+       if (free_a) BN_free(free_a);
        BN_CTX_end(ctx);
        return(ret);
        }