diff --git a/hsm_utils/Makefile b/hsm_utils/Makefile
index 4c5c72c..225a8f8 100644
--- a/hsm_utils/Makefile
+++ b/hsm_utils/Makefile
@@ -84,7 +84,7 @@ XLDLIBS= $(LIBPATH_SWORLD)/librqcard.a \
 
 COMMON_OBJECTS =	$(REFPATH)/nfutil.o $(REFPATH)/nfopt.o $(REFPATH)/getdate.o $(REFPATH)/report.o $(REFPATH)/report-usage.o $(REFPATH)/nftypes.o $(REFPATH)/tokenise.o
 
-EXTRA_OBJECTS = mybignum.o
+EXTRA_OBJECTS = my_hsm_bignum.o my_hsm_alloc.o
 
 COMMON_HEADERS= $(REFPATH)/nfutil.h $(REFPATH)/nfopt.h $(REFPATH)/nftypes.h $(REFPATH)/tokenise.h
 
@@ -96,8 +96,11 @@ $(SRCPATH)/getdate.c: ;
 
 # Simple (non-threaded) programs ------------
 
-mybignum.o: mybignum.c
-	$(CC) $(CFLAGS) $(CPPFLAGS) -o mybignum.o -c mybignum.c
+my_hsm_bignum.o: my_hsm_bignum.c
+	$(CC) $(CFLAGS) $(CPPFLAGS) -o my_hsm_bignum.o -c my_hsm_bignum.c
+
+my_hsm_alloc.o: my_hsm_alloc.c
+	$(CC) $(CFLAGS) $(CPPFLAGS) -o my_hsm_alloc.o -c my_hsm_alloc.c
 
 import_common_key: import_common_key.c $(EXTRA_OBJECTS)
 	$(CC) $(CFLAGS) $(CPPFLAGS) -o import_common_key import_common_key.c $(COMMON_OBJECTS) $(EXTRA_OBJECTS) $(LDLIBS)
diff --git a/hsm_utils/import_ecc_keypair.c b/hsm_utils/import_ecc_keypair.c
index 37dc659..a3eaba5 100644
--- a/hsm_utils/import_ecc_keypair.c
+++ b/hsm_utils/import_ecc_keypair.c
@@ -22,11 +22,11 @@
 #include "rqcard-applic.h"
 #include "rqcard-fips.h"
 
-#include "ncthread-upcalls.h"
+//#include "ncthread-upcalls.h"
 //#include "picky-upcalls.h"
 
-#include "mybignum.h"
-
+#include "my_hsm_bignum.h"
+#include "my_hsm_alloc.h"
 
 #define PRIV_KEY_FILE		"./test_key/test-ecc-privkey.der"
 #define PUB_KEY_FILE		"./test_key/test-ecc-pubkey.der"
@@ -61,40 +61,10 @@ typedef struct
 }
 RSAPublicKeyData;
 
-static void *my_malloc( size_t nbytes, 
-	struct NFast_Call_Context *cctx, struct NFast_Transaction_Context *tctx );
-static void *my_realloc( void *ptr, size_t nbytes,
-	struct NFast_Call_Context *cctx, struct NFast_Transaction_Context *tctx );
-static void my_free( void *ptr,
-	struct NFast_Call_Context *cctx, struct NFast_Transaction_Context *tctx );
-	
 void PrintArray( char *pStr, const unsigned char *pData, int length );
 int BN_bn2binWrapper( BIGNUM *bn, unsigned char **ptr, int *len );
 int my_bin2bignumWrapper( NFast_AppHandle app, unsigned char *ptr, struct NFast_Bignum **nbn, int size );
 
-const NFast_MallocUpcalls my_malloc_upcalls =
-{
-	my_malloc, my_realloc, my_free
-};
-
-static void *my_malloc( size_t nbytes, 
-	struct NFast_Call_Context *cctx, struct NFast_Transaction_Context *tctx )
-{
-	return malloc( nbytes );
-}
-
-static void *my_realloc( void *ptr, size_t nbytes,
-	struct NFast_Call_Context *cctx, struct NFast_Transaction_Context *tctx )
-{
-	return realloc( ptr, nbytes );
-}
-
-static void my_free( void *ptr,
-	struct NFast_Call_Context *cctx, struct NFast_Transaction_Context *tctx )
-{
-	free( ptr );
-}
-
 void PrintArray( char *pStr, const unsigned char *pData, int length )
 {
 	int i;
diff --git a/hsm_utils/import_rsa_keypair.c b/hsm_utils/import_rsa_keypair.c
index 3725460..d2c2159 100644
--- a/hsm_utils/import_rsa_keypair.c
+++ b/hsm_utils/import_rsa_keypair.c
@@ -20,11 +20,10 @@
 #include "rqcard-applic.h"
 #include "rqcard-fips.h"
 
-#include "ncthread-upcalls.h"
 //#include "picky-upcalls.h"
 
-#include "mybignum.h"
-
+#include "my_hsm_bignum.h"
+#include "my_hsm_alloc.h"
 
 #define PRIV_KEY_FILE		"/opt/nfast/work/rsa-priv-key2048.der"
 #define PUB_KEY_FILE		"/opt/nfast/work/rsa-pub-key2048.der"
@@ -59,77 +58,8 @@ typedef struct
 }
 RSAPublicKeyData;
 
-static void *my_malloc( size_t nbytes, 
-	struct NFast_Call_Context *cctx, struct NFast_Transaction_Context *tctx );
-static void *my_realloc( void *ptr, size_t nbytes,
-	struct NFast_Call_Context *cctx, struct NFast_Transaction_Context *tctx );
-static void my_free( void *ptr,
-	struct NFast_Call_Context *cctx, struct NFast_Transaction_Context *tctx );
-	
-int sbn_bin2bignum ( struct NFast_Bignum **ppBN_out,
-			struct NFast_Application *app,
-			const unsigned char *bin, const int size );
-
 void PrintArray( char *pStr, const unsigned char *pData, int length );
 
-const NFast_MallocUpcalls my_malloc_upcalls =
-{
-	my_malloc, my_realloc, my_free
-};
-
-static void *my_malloc( size_t nbytes, 
-	struct NFast_Call_Context *cctx, struct NFast_Transaction_Context *tctx )
-{
-	return malloc( nbytes );
-}
-
-static void *my_realloc( void *ptr, size_t nbytes,
-	struct NFast_Call_Context *cctx, struct NFast_Transaction_Context *tctx )
-{
-	return realloc( ptr, nbytes );
-}
-
-static void my_free( void *ptr,
-	struct NFast_Call_Context *cctx, struct NFast_Transaction_Context *tctx )
-{
-	free( ptr );
-}
-
-// bin データを NFastApp の BigNum データに変換する
-int sbn_bin2bignum ( struct NFast_Bignum **ppBN_out,
-			struct NFast_Application *app,
-			const unsigned char *bin, const int size )
-{
-	struct NFast_Bignum *pBN;
-	int len, i;
-
-	len = size;
-
-	if ( len > MAXBIGNUMBITS/4 ) return Status_OutOfRange;
-
-	pBN = (struct NFast_Bignum *)NFastApp_Malloc( app, sizeof(struct NFast_Bignum), NULL, NULL );
-	if ( !pBN ) return NOMEM;
-
-	pBN->msb_first = 0;
-	pBN->msw_first = 0;
-
-	for ( i = 0; i < len; i++ )
-		pBN->bytes[i] = bin[len-1-i];
-
-	while ( (i & 3) != 0 )
-		pBN->bytes[i++] = 0;
-
-	pBN->nbytes = i;
-
-	*ppBN_out = pBN;
-
-#if 0
-	PrintArray( (char*)"bin2bn array", (const char*)pBN->bytes, pBN->nbytes );
-#endif
-
-	return Status_OK;
-}	// sbn_bin2bignum
-
 void PrintArray( char *pStr, const unsigned char *pData, int length )
 {
 	int i;
diff --git a/hsm_utils/my_hsm_alloc.c b/hsm_utils/my_hsm_alloc.c
new file mode 100644
index 0000000..23470d6
--- /dev/null
+++ b/hsm_utils/my_hsm_alloc.c
@@ -0,0 +1,39 @@
+/*
+*   my_hsm_alloc.c
+*/
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <limits.h>
+
+#include "nfastapp.h"
+#include "nfutil.h"
+#include "my_hsm_alloc.h"
+
+/* --------------------- */
+
+const NFast_MallocUpcalls my_malloc_upcalls =
+{
+	my_malloc, my_realloc, my_free
+};
+
+static void *my_malloc( size_t nbytes, 
+	struct NFast_Call_Context *cctx, struct NFast_Transaction_Context *tctx )
+{
+	return malloc( nbytes );
+}
+
+static void *my_realloc( void *ptr, size_t nbytes,
+	struct NFast_Call_Context *cctx, struct NFast_Transaction_Context *tctx )
+{
+	return realloc( ptr, nbytes );
+}
+
+static void my_free( void *ptr,
+	struct NFast_Call_Context *cctx, struct NFast_Transaction_Context *tctx )
+{
+	free( ptr );
+}
\ No newline at end of file
diff --git a/hsm_utils/my_hsm_alloc.h b/hsm_utils/my_hsm_alloc.h
new file mode 100644
index 0000000..88bad9a
--- /dev/null
+++ b/hsm_utils/my_hsm_alloc.h
@@ -0,0 +1,30 @@
+/*
+*	my_hsm_alloc.h
+*/
+
+#ifndef MY_HSM_ALLOC_H
+#define MY_HSM_ALLOC_H
+
+#include "nfastapp.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern NFast_MallocUpcalls my_hsm_malloc_upcalls;
+
+void *my_hsm_malloc( size_t nbytes, 
+	struct NFast_Call_Context *cctx, struct NFast_Transaction_Context *tctx );
+	
+void *my_hsm_realloc( void *ptr, size_t nbytes,
+	struct NFast_Call_Context *cctx, struct NFast_Transaction_Context *tctx );
+	
+void my_hsm_free( void *ptr,
+	struct NFast_Call_Context *cctx, struct NFast_Transaction_Context *tctx );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif	// MY_HSM_ALLOC_H
+
diff --git a/hsm_utils/mybignum.c b/hsm_utils/my_hsm_bignum.c
similarity index 100%
rename from hsm_utils/mybignum.c
rename to hsm_utils/my_hsm_bignum.c
diff --git a/hsm_utils/mybignum.h b/hsm_utils/my_hsm_bignum.h
similarity index 96%
rename from hsm_utils/mybignum.h
rename to hsm_utils/my_hsm_bignum.h
index c5a9d78..6629b75 100644
--- a/hsm_utils/mybignum.h
+++ b/hsm_utils/my_hsm_bignum.h
@@ -22,8 +22,8 @@
 *
 */
 
-#ifndef MY_BIGNUM_H
-#define MY_BIGNUM_H
+#ifndef MY_ALLOC_H
+#define MY_ALLOC_H
 
 #include "nfastapp.h"