diff --git a/Makefile b/Makefile
index ccd052f..fae248a 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,7 @@ OBJ_DIR=obj
 EXE_DIR=bin
 SRC_SRC=fp.cpp bn_c256.cpp bn_c384.cpp bn_c512.cpp she_c256.cpp
 TEST_SRC=fp_test.cpp ec_test.cpp fp_util_test.cpp window_method_test.cpp elgamal_test.cpp fp_tower_test.cpp gmp_test.cpp bn_test.cpp bn384_test.cpp glv_test.cpp paillier_test.cpp she_test.cpp vint_test.cpp bn512_test.cpp ecdsa_test.cpp conversion_test.cpp
-TEST_SRC+=bn_c256_test.cpp bn_c384_test.cpp bn_c512_test.cpp she_c256_test.cpp she_c384_test.cpp
+TEST_SRC+=bn_c256_test.cpp bn_c384_test.cpp bn_c384_256_test.cpp bn_c512_test.cpp she_c256_test.cpp she_c384_test.cpp
 TEST_SRC+=aggregate_sig_test.cpp array_test.cpp
 TEST_SRC+=bls12_test.cpp
 TEST_SRC+=ecdsa_c_test.cpp
@@ -32,6 +32,7 @@ MCL_LIB=$(LIB_DIR)/libmcl.a
 MCL_SNAME=mcl$(SHARE_BASENAME_SUF)
 BN256_SNAME=mclbn256$(SHARE_BASENAME_SUF)
 BN384_SNAME=mclbn384$(SHARE_BASENAME_SUF)
+BN384_256_SNAME=mclbn384_256$(SHARE_BASENAME_SUF)
 BN512_SNAME=mclbn512$(SHARE_BASENAME_SUF)
 SHE256_SNAME=mclshe256$(SHARE_BASENAME_SUF)
 MCL_SLIB=$(LIB_DIR)/lib$(MCL_SNAME).$(LIB_SUF)
@@ -39,12 +40,14 @@ BN256_LIB=$(LIB_DIR)/libmclbn256.a
 BN256_SLIB=$(LIB_DIR)/lib$(BN256_SNAME).$(LIB_SUF)
 BN384_LIB=$(LIB_DIR)/libmclbn384.a
 BN384_SLIB=$(LIB_DIR)/lib$(BN384_SNAME).$(LIB_SUF)
+BN384_256_LIB=$(LIB_DIR)/libmclbn384_256.a
+BN384_256_SLIB=$(LIB_DIR)/lib$(BN384_256_SNAME).$(LIB_SUF)
 BN512_LIB=$(LIB_DIR)/libmclbn512.a
 BN512_SLIB=$(LIB_DIR)/lib$(BN512_SNAME).$(LIB_SUF)
 SHE256_LIB=$(LIB_DIR)/libmclshe256.a
 SHE384_LIB=$(LIB_DIR)/libmclshe384.a
 ECDSA_LIB=$(LIB_DIR)/libmclecdsa.a
-all: $(MCL_LIB) $(MCL_SLIB) $(BN256_LIB) $(BN256_SLIB) $(BN384_LIB) $(BN384_SLIB) $(BN512_LIB) $(BN512_SLIB) $(SHE256_LIB) $(SHE384_lib) $(ECDSA_LIB)
+all: $(MCL_LIB) $(MCL_SLIB) $(BN256_LIB) $(BN256_SLIB) $(BN384_LIB) $(BN384_SLIB) $(BN384_256_LIB) $(BN384_256_SLIB) $(BN512_LIB) $(BN512_SLIB) $(SHE256_LIB) $(SHE384_lib) $(ECDSA_LIB)
 
 #LLVM_VER=-3.8
 LLVM_LLC=llc$(LLVM_VER)
@@ -69,6 +72,7 @@ ASM_OBJ=$(OBJ_DIR)/$(CPU).o
 LIB_OBJ=$(OBJ_DIR)/fp.o
 BN256_OBJ=$(OBJ_DIR)/bn_c256.o
 BN384_OBJ=$(OBJ_DIR)/bn_c384.o
+BN384_256_OBJ=$(OBJ_DIR)/bn_c384_256.o
 BN512_OBJ=$(OBJ_DIR)/bn_c512.o
 SHE256_OBJ=$(OBJ_DIR)/she_c256.o
 SHE384_OBJ=$(OBJ_DIR)/she_c384.o
@@ -115,12 +119,14 @@ endif
 ifneq ($(findstring $(OS),mac/mingw64),)
   BN256_SLIB_LDFLAGS+=-l$(MCL_SNAME) -L./lib
   BN384_SLIB_LDFLAGS+=-l$(MCL_SNAME) -L./lib
+  BN384_256_SLIB_LDFLAGS+=-l$(MCL_SNAME) -L./lib
   BN512_SLIB_LDFLAGS+=-l$(MCL_SNAME) -L./lib
 endif
 ifeq ($(OS),mingw64)
   MCL_SLIB_LDFLAGS+=-Wl,--out-implib,$(LIB_DIR)/lib$(MCL_SNAME).a
   BN256_SLIB_LDFLAGS+=-Wl,--out-implib,$(LIB_DIR)/lib$(BN256_SNAME).a
   BN384_SLIB_LDFLAGS+=-Wl,--out-implib,$(LIB_DIR)/lib$(BN384_SNAME).a
+  BN384_256_SLIB_LDFLAGS+=-Wl,--out-implib,$(LIB_DIR)/lib$(BN384_256_SNAME).a
   BN512_SLIB_LDFLAGS+=-Wl,--out-implib,$(LIB_DIR)/lib$(BN512_SNAME).a
 endif
 
@@ -148,12 +154,18 @@ $(BN256_SLIB): $(BN256_OBJ) $(MCL_SLIB)
 $(BN384_LIB): $(BN384_OBJ)
 	$(AR) $@ $(BN384_OBJ)
 
+$(BN384_256_LIB): $(BN384_256_OBJ)
+	$(AR) $@ $(BN384_256_OBJ)
+
 $(BN512_LIB): $(BN512_OBJ)
 	$(AR) $@ $(BN512_OBJ)
 
 $(BN384_SLIB): $(BN384_OBJ) $(MCL_SLIB)
 	$(PRE)$(CXX) -o $@ $(BN384_OBJ) -shared $(LDFLAGS) $(BN384_SLIB_LDFLAGS)
 
+$(BN384_256_SLIB): $(BN384_256_OBJ) $(MCL_SLIB)
+	$(PRE)$(CXX) -o $@ $(BN384_256_OBJ) -shared $(LDFLAGS) $(BN384_256_SLIB_LDFLAGS)
+
 $(BN512_SLIB): $(BN512_OBJ) $(MCL_SLIB)
 	$(PRE)$(CXX) -o $@ $(BN512_OBJ) -shared $(LDFLAGS) $(BN512_SLIB_LDFLAGS)
 
@@ -235,6 +247,9 @@ $(EXE_DIR)/bn_c256_test.exe: $(OBJ_DIR)/bn_c256_test.o $(BN256_LIB) $(MCL_LIB)
 $(EXE_DIR)/bn_c384_test.exe: $(OBJ_DIR)/bn_c384_test.o $(BN384_LIB) $(MCL_LIB)
 	$(PRE)$(CXX) $< -o $@ $(BN384_LIB) $(MCL_LIB) $(LDFLAGS)
 
+$(EXE_DIR)/bn_c384_256_test.exe: $(OBJ_DIR)/bn_c384_256_test.o $(BN384_256_LIB) $(MCL_LIB)
+	$(PRE)$(CXX) $< -o $@ $(BN384_256_LIB) $(MCL_LIB) $(LDFLAGS)
+
 $(EXE_DIR)/bn_c512_test.exe: $(OBJ_DIR)/bn_c512_test.o $(BN512_LIB) $(MCL_LIB)
 	$(PRE)$(CXX) $< -o $@ $(BN512_LIB) $(MCL_LIB) $(LDFLAGS)
 
@@ -315,7 +330,7 @@ update_xbyak:
 
 
 clean:
-	$(RM) $(MCL_LIB) $(MCL_SLIB) $(BN256_LIB) $(BN256_SLIB) $(BN384_LIB) $(BN384_SLIB) $(BN512_LIB) $(BN512_SLIB) $(SHE256_LIB) $(OBJ_DIR)/*.o $(OBJ_DIR)/*.d $(EXE_DIR)/*.exe $(GEN_EXE) $(ASM_OBJ) $(LIB_OBJ) $(BN256_OBJ) $(BN384_OBJ) $(BN512_OBJ) $(LLVM_SRC) $(FUNC_LIST) src/*.ll lib/*.a
+	$(RM) $(LIB_DIR)/*.a $(EXE_DIR)/*.$(LIB_SUF) $(OBJ_DIR)/*.o $(OBJ_DIR)/*.d $(EXE_DIR)/*.exe $(GEN_EXE) $(ASM_OBJ) $(LIB_OBJ) $(BN256_OBJ) $(BN384_OBJ) $(BN512_OBJ) $(LLVM_SRC) $(FUNC_LIST) src/*.ll lib/*.a
 
 ALL_SRC=$(SRC_SRC) $(TEST_SRC) $(SAMPLE_SRC)
 DEPEND_FILE=$(addprefix $(OBJ_DIR)/, $(addsuffix .d,$(basename $(ALL_SRC))))
diff --git a/src/bn_c384.cpp b/src/bn_c384.cpp
index bb4a2f7..067e728 100644
--- a/src/bn_c384.cpp
+++ b/src/bn_c384.cpp
@@ -2,5 +2,6 @@
 	implementation of mclBn_* apis
 */
 #define MCLBN_FP_UNIT_SIZE 6
+#define MCLBN_FR_UNIT_SIZE 6
 #include "bn_c_impl.hpp"
 
diff --git a/src/bn_c384_256.cpp b/src/bn_c384_256.cpp
new file mode 100644
index 0000000..5630e83
--- /dev/null
+++ b/src/bn_c384_256.cpp
@@ -0,0 +1,7 @@
+/*
+	implementation of mclBn_* apis
+*/
+#define MCLBN_FP_UNIT_SIZE 6
+#define MCLBN_FR_UNIT_SIZE 4
+#include "bn_c_impl.hpp"
+
diff --git a/src/bn_c_impl.hpp b/src/bn_c_impl.hpp
index 812ff6c..bb0b4ba 100644
--- a/src/bn_c_impl.hpp
+++ b/src/bn_c_impl.hpp
@@ -1,12 +1,16 @@
 #define MCLBN_DLL_EXPORT
 #include <mcl/bn.h>
 
-#if MCLBN_FP_UNIT_SIZE == 4
+#if MCLBN_FP_UNIT_SIZE == 4 && MCLBN_FR_UNIT_SIZE == 4
 #include <mcl/bn256.hpp>
-#elif MCLBN_FP_UNIT_SIZE == 6
+#elif MCLBN_FP_UNIT_SIZE == 6 && MCLBN_FR_UNIT_SIZE == 6
 #include <mcl/bn384.hpp>
-#elif MCLBN_FP_UNIT_SIZE == 8
+#elif MCLBN_FP_UNIT_SIZE == 6 && MCLBN_FR_UNIT_SIZE == 4
+#include <mcl/bls12_381.hpp>
+#elif MCLBN_FP_UNIT_SIZE == 8 && MCLBN_FR_UNIT_SIZE == 8
 #include <mcl/bn512.hpp>
+#else
+	#error "not supported size"
 #endif
 #include <mcl/lagrange.hpp>
 using namespace mcl::bn;
@@ -48,7 +52,7 @@ extern "C" MCLBN_DLL_API void mclBnFree(void *p)
 int mclBn_init(int curve, int compiledTimeVar)
 {
 	if (compiledTimeVar != MCLBN_COMPILED_TIME_VAR) {
-		return -10;
+		return -(compiledTimeVar | (MCLBN_COMPILED_TIME_VAR * 100));
 	}
 	const mcl::CurveParam& cp = mcl::getCurveParam(curve);
 	bool b;
diff --git a/test/bn_c384_256_test.cpp b/test/bn_c384_256_test.cpp
new file mode 100644
index 0000000..e7bbefd
--- /dev/null
+++ b/test/bn_c384_256_test.cpp
@@ -0,0 +1,7 @@
+#include <mcl/bls12_381.hpp>
+using namespace mcl::bls12;
+#define MCLBN_DEFINE_STRUCT
+#define MCLBN_FP_UNIT_SIZE 6
+#define MCLBN_FR_UNIT_SIZE 4
+#include "bn_c_test.hpp"
+
diff --git a/test/bn_c_test.hpp b/test/bn_c_test.hpp
index 9b5c4bb..d33cdf5 100644
--- a/test/bn_c_test.hpp
+++ b/test/bn_c_test.hpp
@@ -27,9 +27,12 @@ CYBOZU_TEST_AUTO(init)
 #if MCLBN_FP_UNIT_SIZE == 4
 	printf("test BN254 %d\n", MCLBN_FP_UNIT_SIZE);
 	ret = mclBn_init(MCL_BN254, MCLBN_COMPILED_TIME_VAR);
-#elif MCLBN_FP_UNIT_SIZE == 6
+#elif MCLBN_FP_UNIT_SIZE == 6 && MCLBN_FR_UNIT_SIZE == 6
 	printf("test BN381_1 %d\n", MCLBN_FP_UNIT_SIZE);
 	ret = mclBn_init(MCL_BN381_1, MCLBN_COMPILED_TIME_VAR);
+#elif MCLBN_FP_UNIT_SIZE == 6 && MCLBN_FR_UNIT_SIZE == 4
+	printf("test BLS12_381 %d\n", MCLBN_FP_UNIT_SIZE);
+	ret = mclBn_init(MCL_BLS12_381, MCLBN_COMPILED_TIME_VAR);
 #elif MCLBN_FP_UNIT_SIZE == 8
 	printf("test BN462 %d\n", MCLBN_FP_UNIT_SIZE);
 	ret = mclBn_init(MCL_BN462, MCLBN_COMPILED_TIME_VAR);
@@ -358,6 +361,7 @@ CYBOZU_TEST_AUTO(precomputed)
 
 CYBOZU_TEST_AUTO(serialize)
 {
+	const size_t FrSize = mclBn_getFrByteSize();
 	const size_t G1Size = mclBn_getG1ByteSize();
 	mclBnFr x1, x2;
 	mclBnG1 P1, P2;
@@ -367,7 +371,7 @@ CYBOZU_TEST_AUTO(serialize)
 	size_t expectSize;
 	size_t ret;
 	// Fr
-	expectSize = G1Size;
+	expectSize = FrSize;
 	mclBnFr_setInt(&x1, -1);
 	n = mclBnFr_serialize(buf, sizeof(buf), &x1);
 	CYBOZU_TEST_EQUAL(n, expectSize);
@@ -432,7 +436,8 @@ CYBOZU_TEST_AUTO(serialize)
 
 CYBOZU_TEST_AUTO(serializeToHexStr)
 {
-	const size_t G1Size = mclBn_getG1ByteSize() * 2;
+	const size_t FrSize = mclBn_getFrByteSize();
+	const size_t G1Size = mclBn_getG1ByteSize();
 	mclBnFr x1, x2;
 	mclBnG1 P1, P2;
 	mclBnG2 Q1, Q2;
@@ -441,7 +446,7 @@ CYBOZU_TEST_AUTO(serializeToHexStr)
 	size_t expectSize;
 	size_t ret;
 	// Fr
-	expectSize = G1Size;
+	expectSize = FrSize * 2; // hex string
 	mclBnFr_setInt(&x1, -1);
 	n = mclBnFr_getStr(buf, sizeof(buf), &x1, MCLBN_IO_SERIALIZE_HEX_STR);
 	CYBOZU_TEST_EQUAL(n, expectSize);
@@ -462,7 +467,7 @@ CYBOZU_TEST_AUTO(serializeToHexStr)
 	CYBOZU_TEST_EQUAL(n, expectSize);
 
 	// G1
-	expectSize = G1Size;
+	expectSize = G1Size * 2; // hex string
 	mclBnG1_hashAndMapTo(&P1, "1", 1);
 	n = mclBnG1_getStr(buf, sizeof(buf), &P1, MCLBN_IO_SERIALIZE_HEX_STR);
 	CYBOZU_TEST_EQUAL(n, expectSize);
@@ -483,7 +488,7 @@ CYBOZU_TEST_AUTO(serializeToHexStr)
 	CYBOZU_TEST_EQUAL(n, expectSize);
 
 	// G2
-	expectSize = G1Size * 2;
+	expectSize = G1Size * 2 * 2; // hex string
 	mclBnG2_hashAndMapTo(&Q1, "1", 1);
 	n = mclBnG2_getStr(buf, sizeof(buf), &Q1, MCLBN_IO_SERIALIZE_HEX_STR);
 	CYBOZU_TEST_EQUAL(n, expectSize);
@@ -504,7 +509,7 @@ CYBOZU_TEST_AUTO(serializeToHexStr)
 	CYBOZU_TEST_EQUAL(n, expectSize);
 }
 
-#if MCLBN_FP_UNIT_SIZE == 6
+#if MCLBN_FP_UNIT_SIZE == 6 && MCLBN_FR_UNIT_SIZE >= 6
 CYBOZU_TEST_AUTO(badG2)
 {
 	int ret;