diff --git a/Makefile b/Makefile
index ba42816..5cc230e 100644
--- a/Makefile
+++ b/Makefile
@@ -50,11 +50,6 @@ NFAST_LDLIBS = \
 					$(NFAST_LIBPATH)/libnflog.a \
 					$(NFAST_LIBPATH)/libcutils.a -lm \
 
-# nFast OBJS
-NFAST_OBJS_PATH = $(NFAST_EXAMPLES)/nfuser/build-gcc-lib
-NFAST_OBJS_LIST = \
-				$(NFAST_OBJS_PATH)/nfutil.o \
-
 else # !USE_HSM
 
 # HSMが使用できない場合は、DUMMY_KEYを使ってテストする。
@@ -140,7 +135,7 @@ package_build :
 endif
 
 $(TARGET): $(OBJS) 
-	$(LD) $(LDFLAGS) $(OBJS) -o $@ $(LDLIBS) $(NFAST_OBJS_LIST)
+	$(LD) $(LDFLAGS) $(OBJS) -o $@ $(LDLIBS)
 
 $(OBJS): $(HEADS) Makefile
 
diff --git a/cr_hsm_bignum.c b/cr_hsm_bignum.c
index 63be796..234e68b 100644
--- a/cr_hsm_bignum.c
+++ b/cr_hsm_bignum.c
@@ -34,6 +34,61 @@ static int alloc_counter = 0;
 
 /* --------------------- */
 
+// original : nfutil_copybytes ( nfutil.c )
+static void my_util_copybytes ( unsigned char *dst, const unsigned char *src,
+	unsigned nbytes, int swapends, int swapwords )
+{
+  int inc;
+  unsigned nwords;
+
+  /* Copies dst to src, swapping endianness and/or word order. dst and src mustn't overlap! */
+
+  assert( (nbytes & 3)==0 ); /* Must be whole number of M_Words */
+
+  if ( !swapends && !swapwords )
+  {
+    memcpy(dst, src, nbytes);
+    return;
+  }
+
+  if ( swapwords )
+  {
+    dst += (nbytes-4);
+    inc=-4;
+  }
+  else
+    inc=4;
+
+  nwords = nbytes>>2;
+
+  if ( swapends )
+  {
+    while ( nwords-- > 0 )
+    {
+      dst[0]=src[3];
+      dst[1]=src[2];
+      dst[2]=src[1];
+      dst[3]=src[0];
+      dst += inc;
+      src += 4;
+    }
+  }
+  else
+  {
+    while ( nwords-- > 0 )
+    {
+      dst[0]=src[0];
+      dst[1]=src[1];
+      dst[2]=src[2];
+      dst[3]=src[3];
+      dst += inc;
+      src += 4;
+    }
+  }
+}
+
+/* --------------------- */
+
 int my_bignumreceiveupcall(struct NFast_Application *app,
                                struct NFast_Call_Context *cctx,
                                struct NFast_Transaction_Context *tctx,
@@ -50,7 +105,7 @@ int my_bignumreceiveupcall(struct NFast_Application *app,
   if ( !pBN ) return NOMEM;
   alloc_counter++;
 
-  nfutil_copybytes(pBN->bytes, (const unsigned char *)source,
+  my_util_copybytes(pBN->bytes, (const unsigned char *)source,
 	nbytes, 0, 0);
 
   pBN->msb_first = msbitfirst;
@@ -93,7 +148,7 @@ int my_bignumsendupcall(struct NFast_Application *app,
 
   swapends = (!msbitfirst) ^ (!pBN->msb_first);
   swapwords = (!mswordfirst) ^ (!pBN->msw_first);
-  nfutil_copybytes( (unsigned char *)dest, (*bignum)->bytes, nbytes,
+  my_util_copybytes( (unsigned char *)dest, (*bignum)->bytes, nbytes,
 	swapends, swapwords );
   return Status_OK;
 }