diff --git a/ffi/python/she.py b/ffi/python/she.py
index 97d8dc9..d2562ee 100644
--- a/ffi/python/she.py
+++ b/ffi/python/she.py
@@ -34,7 +34,7 @@ def init(curveType=MCL_BN254):
 	else:
 		raise RuntimeError("not support yet", name)
 	lib = cdll.LoadLibrary(libName)
-	ret = lib.sheInit(MCL_BN254, MCLBN_COMPILED_TIME_VAR)
+	ret = lib.sheInit(curveType, MCLBN_COMPILED_TIME_VAR)
 	if ret != 0:
 		raise RuntimeError("sheInit", ret)
 	# custom setup for a function which returns pointer
@@ -89,6 +89,34 @@ class CipherTextGT(Structure):
 	def serializeToHexStr(self):
 		return hexStr(self.serialize())
 
+def _enc(CT, enc, encIntVec, neg, p, m):
+	c = CT()
+	if -0x80000000 <= m <= 0x7fffffff:
+		ret = enc(byref(c.v), p, m)
+		if ret != 0:
+			raise RuntimeError("enc", m)
+		return c
+	if m < 0:
+		minus = True
+		m = -m
+	else:
+		minus = False
+	if m >= 1 << (MCLBN_FR_UNIT_SIZE * 64):
+		raise RuntimeError("enc:too large m", m)
+	a = []
+	while m > 0:
+		a.append(m & 0xffffffff)
+		m >>= 32
+	ca = (c_uint * len(a))(*a)
+	ret = encIntVec(byref(c.v), p, byref(ca), sizeof(ca))
+	if ret != 0:
+		raise RuntimeError("enc:IntVec", m)
+	if minus:
+		ret = neg(byref(c.v), byref(c.v))
+		if ret != 0:
+			raise RuntimeError("enc:neg", m)
+	return c
+
 class PrecomputedPublicKey(Structure):
 	def __init__(self):
 		self.p = 0
@@ -100,23 +128,11 @@ class PrecomputedPublicKey(Structure):
 	def destroy(self):
 		lib.shePrecomputedPublicKeyDestroy(self.p)
 	def encG1(self, m):
-		c = CipherTextG1()
-		ret = lib.shePrecomputedPublicKeyEncG1(byref(c.v), self.p, m)
-		if ret != 0:
-			raise RuntimeError("encG1", m)
-		return c
+		return _enc(CipherTextG1, lib.shePrecomputedPublicKeyEncG1, lib.shePrecomputedPublicKeyEncIntVecG1, lib.sheNegG1, self.p, m)
 	def encG2(self, m):
-		c = CipherTextG2()
-		ret = lib.shePrecomputedPublicKeyEncG2(byref(c.v), self.p, m)
-		if ret != 0:
-			raise RuntimeError("encG2", m)
-		return c
+		return _enc(CipherTextG2, lib.shePrecomputedPublicKeyEncG2, lib.shePrecomputedPublicKeyEncIntVecG2, lib.sheNegG2, self.p, m)
 	def encGT(self, m):
-		c = CipherTextGT()
-		ret = lib.shePrecomputedPublicKeyEncGT(byref(c.v), self.p, m)
-		if ret != 0:
-			raise RuntimeError("encGT", m)
-		return c
+		return _enc(CipherTextGT, lib.shePrecomputedPublicKeyEncGT, lib.shePrecomputedPublicKeyEncIntVecGT, lib.sheNegGT, self.p, m)
 
 class PublicKey(Structure):
 	_fields_ = [("v", c_ulonglong * PUB_SIZE)]
@@ -129,23 +145,11 @@ class PublicKey(Structure):
 	def serializeToHexStr(self):
 		return hexStr(self.serialize())
 	def encG1(self, m):
-		c = CipherTextG1()
-		ret = lib.sheEncG1(byref(c.v), byref(self.v), m)
-		if ret != 0:
-			raise RuntimeError("encG1", m)
-		return c
+		return _enc(CipherTextG1, lib.sheEncG1, lib.sheEncIntVecG1, lib.sheNegG1, byref(self.v), m)
 	def encG2(self, m):
-		c = CipherTextG2()
-		ret = lib.sheEncG2(byref(c.v), byref(self.v), m)
-		if ret != 0:
-			raise RuntimeError("encG2", m)
-		return c
+		return _enc(CipherTextG2, lib.sheEncG2, lib.sheEncIntVecG2, lib.sheNegG2, byref(self.v), m)
 	def encGT(self, m):
-		c = CipherTextGT()
-		ret = lib.sheEncGT(byref(c.v), byref(self.v), m)
-		if ret != 0:
-			raise RuntimeError("encGT", m)
-		return c
+		return _enc(CipherTextGT, lib.sheEncGT, lib.sheEncIntVecGT, lib.sheNegGT, byref(self.v), m)
 	def createPrecomputedPublicKey(self):
 		ppub = PrecomputedPublicKey()
 		ppub.create()
@@ -234,15 +238,12 @@ def mul(cx, cy):
 	if isinstance(cx, CipherTextG1) and isinstance(cy, CipherTextG2):
 		out = CipherTextGT()
 		ret = lib.sheMul(byref(out.v), byref(cx.v), byref(cy.v))
-	elif isinstance(cx, CipherTextG1) and isinstance(cy, int):
-		out = CipherTextG1()
-		ret = lib.sheMulG1(byref(out.v), byref(cx.v), cy)
-	elif isinstance(cx, CipherTextG2) and isinstance(cy, int):
-		out = CipherTextG2()
-		ret = lib.sheMulG2(byref(out.v), byref(cx.v), cy)
-	elif isinstance(cx, CipherTextGT) and isinstance(cy, int):
-		out = CipherTextGT()
-		ret = lib.sheMulGT(byref(out.v), byref(cx.v), cy)
+	elif isinstance(cx, CipherTextG1) and (isinstance(cy, int) or isinstance(cy, long)):
+		return _enc(CipherTextG1, lib.sheMulG1, lib.sheMulIntVecG1, lib.sheNegG1, byref(cx.v), cy)
+	elif isinstance(cx, CipherTextG2) and (isinstance(cy, int) or isinstance(cy, long)):
+		return _enc(CipherTextG2, lib.sheMulG2, lib.sheMulIntVecG2, lib.sheNegG2, byref(cx.v), cy)
+	elif isinstance(cx, CipherTextGT) and (isinstance(cy, int) or isinstance(cy, long)):
+		return _enc(CipherTextGT, lib.sheMulGT, lib.sheMulIntVecGT, lib.sheNegGT, byref(cx.v), cy)
 	if ret != 0:
 		raise RuntimeError("mul")
 	return out
@@ -279,6 +280,27 @@ if __name__ == '__main__':
 	if sec.dec(mul(c11, 3)) != m11 * 3: print("err_mul1")
 	if sec.dec(mul(c21, 7)) != m21 * 7: print("err_mul2")
 
+	# large integer
+	m1 = 0x140712384712047127412964192876419276341
+	m2 = -m1 + 123
+	c1 = pub.encG1(m1)
+	c2 = pub.encG1(m2)
+	if sec.dec(add(c1, c2)) != 123: print("err-large11")
+	c1 = mul(pub.encG1(1), m1)
+	if sec.dec(add(c1, c2)) != 123: print("err-large12")
+
+	c1 = pub.encG2(m1)
+	c2 = pub.encG2(m2)
+	if sec.dec(add(c1, c2)) != 123: print("err-large21")
+	c1 = mul(pub.encG2(1), m1)
+	if sec.dec(add(c1, c2)) != 123: print("err-large22")
+
+	c1 = pub.encGT(m1)
+	c2 = pub.encGT(m2)
+	if sec.dec(add(c1, c2)) != 123: print("err-large31")
+	c1 = mul(pub.encGT(1), m1)
+	if sec.dec(add(c1, c2)) != 123: print("err-large32")
+
 	mt = -56
 	ct = pub.encGT(mt)
 	if sec.dec(ct) != mt: print("err7")
@@ -291,6 +313,19 @@ if __name__ == '__main__':
 	c1 = ppub.encG1(m11)
 	if sec.dec(c1) != m11: print("err9")
 
+	# large integer for precomputedPublicKey
+	m1 = 0x140712384712047127412964192876419276341
+	m2 = -m1 + 123
+	c1 = ppub.encG1(m1)
+	c2 = ppub.encG1(m2)
+	if sec.dec(add(c1, c2)) != 123: print("err10")
+	c1 = ppub.encG2(m1)
+	c2 = ppub.encG2(m2)
+	if sec.dec(add(c1, c2)) != 123: print("err11")
+	c1 = ppub.encGT(m1)
+	c2 = ppub.encGT(m2)
+	if sec.dec(add(c1, c2)) != 123: print("err12")
+
 	import sys
 	if sys.version_info.major >= 3:
 		import timeit