sangge/tpre-python
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feat: add KDF function

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sangge 2023-10-15 14:00:55 +08:00
parent 0782fb2145
commit b1fd853270
1 changed files with 16 additions and 7 deletions
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23
src/tpre.py
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@ -117,7 +117,7 @@ def jacobianMultiply(
return jacobianAdd(jacobianDouble(jacobianMultiply((Xp, Yp, Zp), n // 2, N, A, P), A, P), (Xp, Yp, Zp), A, P)
raise ValueError("jacobian Multiply error")
def Setup(sec: int) -> Tuple[CurveFp, Tuple[int, int],
def Setup() -> Tuple[CurveFp, Tuple[int, int],
Tuple[int, int], Callable,
Callable, Callable, Callable]:
'''
@ -125,7 +125,6 @@ def Setup(sec: int) -> Tuple[CurveFp, Tuple[int, int],
sec: an init safety param
return:
<<<<<<< HEAD
G: sm2 curve
g: generator
U: another generator
@ -159,7 +158,7 @@ def Setup(sec: int) -> Tuple[CurveFp, Tuple[int, int],
for j in i:
sm3.update(j.to_bytes())
digest = sm3.digest()
digest = int.from_bytes(digest,'big') % sm2p256v1.P
digest = int.from_bytes(digest, 'big') % sm2p256v1.P
return digest
def hash4(triple_G: Tuple[Tuple[int, int],
@ -172,10 +171,18 @@ def Setup(sec: int) -> Tuple[CurveFp, Tuple[int, int],
sm3.update(j.to_bytes())
sm3.update(Zp.to_bytes())
digest = sm3.digest()
digest = int.from_bytes(digest,'big') % sm2p256v1.P
digest = int.from_bytes(digest, 'big') % sm2p256v1.P
return digest
def KDF(G: Tuple[int, int]) -> int:
sm3 = Sm3() #pylint: disable=e0602
for i in G:
sm3.update(i.to_bytes())
digest = sm3.digest()
digest = digest
digest = int.from_bytes(digest, 'big') % sm2p256v1.P
return digest
KDF = Sm3() #pylint: disable=e0602
return G, g, U, hash2, hash3, hash4, KDF
@ -209,8 +216,10 @@ def Enc(pk: Tuple[int, int], m: int) -> Tuple[Tuple[
enca = Encapsulate(pk)
K = enca[0]
capsule = enca[1]
sm4_enc = Sm4Cbc(key, iv, DO_ENCRYPT) #pylint: disable=e0602
if len(K) != 16:
raise ValueError("invalid key length")
iv = b'tpretpretpretpre'
sm4_enc = Sm4Cbc(K, iv, DO_ENCRYPT) #pylint: disable=e0602
plain_Data = m.to_bytes()
enc_Data = sm4_enc.update(plain_Data)
enc_Data += sm4_enc.finish()