python SM2明文密码加解密

1. 安装依赖包

pip install gmssl

2. 封装类 sm2encry.py

from gmssl import sm2
from base64 import b64encode, b64decode
# sm2的公私钥
SM2_PRIVATE_KEY = '00B9AB0B828FF68872F21A837FC303668428DEA11DCD1B24429D0C99E24EED83D5'
SM2_PUBLIC_KEY = 'B9C9A6E04E9C91F7BA880429273747D7EF5DDEB0BB2FF6317EB00BEF331A83081A6994B8993F3F5D6EADDDB81872266C87C018FB4162F5AF347B483E24620207'

sm2_crypt = sm2.CryptSM2(public_key=SM2_PUBLIC_KEY, private_key=SM2_PRIVATE_KEY)


class sm2Encrypt:
# 加密
def encrypt(self, info):
encode_info = sm2_crypt.encrypt(info.encode(encoding="utf-8"))
encode_info = b64encode(encode_info).decode() # 将二进制bytes通过base64编码
return encode_info

# 解密
def decrypt(self, info):
decode_info = b64decode(info.encode()) # 通过base64解码成二进制bytes
decode_info = sm2_crypt.decrypt(decode_info).decode(encoding="utf-8")
return decode_info


if __name__ == "__main__":
origin_pwd = '123456'
sm2 = sm2Encrypt()
# 加密的密码
encrypy_pwd = sm2.encrypt(origin_pwd)
print(encrypy_pwd)
# 解密的密码
decrypt_pwd = sm2.decrypt(encrypy_pwd)
print(decrypt_pwd)

3. 使用示例（到这一步已经可以完成，第4步是为了生成不同的公私钥）

from sm2encrypy import sm2Encrypy
pass_encrypt = sm2Encrypy()
pwd = pass_encrypt.decrypt("H24OlVZgSTtevCW138O+C5PlZp8OiD920JnpVr7r9ndkGBWFZUVDD48iIVrZRnamgosV5910m9k0438WpIyi0guEt8F5inG7Y5A51whRfdPZ+qdvWVQxI857CBEzkb3h1bMp1ETQ")
print(pwd)

4. 封装类： sm2utils.py (随机生成不同的公私钥)

操作： 执行 python3 sm2utils.py
备注： sm2utils.py内容如下，可以直接照抄

from random import SystemRandom

class CurveFp:
def __init__(self, A, B, P, N, Gx, Gy, name):
self.A = A
self.B = B
self.P = P
self.N = N
self.Gx = Gx
self.Gy = Gy
self.name = name

sm2p256v1 = CurveFp(
name="sm2p256v1",
A=0xFFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFC,
B=0x28E9FA9E9D9F5E344D5A9E4BCF6509A7F39789F515AB8F92DDBCBD414D940E93,
P=0xFFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFF,
N=0xFFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFF7203DF6B21C6052B53BBF40939D54123,
Gx=0x32C4AE2C1F1981195F9904466A39C9948FE30BBFF2660BE1715A4589334C74C7,
Gy=0xBC3736A2F4F6779C59BDCEE36B692153D0A9877CC62A474002DF32E52139F0A0
)

def multiply(a, n, N, A, P):
return fromJacobian(jacobianMultiply(toJacobian(a), n, N, A, P), P)

def add(a, b, A, P):
return fromJacobian(jacobianAdd(toJacobian(a), toJacobian(b), A, P), P)

def inv(a, n):
if a == 0:
return 0
lm, hm = 1, 0
low, high = a % n, n
while low > 1:
r = high//low
nm, new = hm-lm*r, high-low*r
lm, low, hm, high = nm, new, lm, low
return lm % n

def toJacobian(Xp_Yp):
Xp, Yp = Xp_Yp
return (Xp, Yp, 1)

def fromJacobian(Xp_Yp_Zp, P):
Xp, Yp, Zp = Xp_Yp_Zp
z = inv(Zp, P)
return ((Xp * z**2) % P, (Yp * z**3) % P)

def jacobianDouble(Xp_Yp_Zp, A, P):
Xp, Yp, Zp = Xp_Yp_Zp
if not Yp:
return (0, 0, 0)
ysq = (Yp ** 2) % P
S = (4 * Xp * ysq) % P
M = (3 * Xp ** 2 + A * Zp ** 4) % P
nx = (M**2 - 2 * S) % P
ny = (M * (S - nx) - 8 * ysq ** 2) % P
nz = (2 * Yp * Zp) % P
return (nx, ny, nz)

def jacobianAdd(Xp_Yp_Zp, Xq_Yq_Zq, A, P):
Xp, Yp, Zp = Xp_Yp_Zp
Xq, Yq, Zq = Xq_Yq_Zq
if not Yp:
return (Xq, Yq, Zq)
if not Yq:
return (Xp, Yp, Zp)
U1 = (Xp * Zq ** 2) % P
U2 = (Xq * Zp ** 2) % P
S1 = (Yp * Zq ** 3) % P
S2 = (Yq * Zp ** 3) % P
if U1 == U2:
if S1 != S2:
return (0, 0, 1)
return jacobianDouble((Xp, Yp, Zp), A, P)
H = U2 - U1
R = S2 - S1
H2 = (H * H) % P
H3 = (H * H2) % P
U1H2 = (U1 * H2) % P
nx = (R ** 2 - H3 - 2 * U1H2) % P
ny = (R * (U1H2 - nx) - S1 * H3) % P
nz = (H * Zp * Zq) % P
return (nx, ny, nz)

def jacobianMultiply(Xp_Yp_Zp, n, N, A, P):
Xp, Yp, Zp = Xp_Yp_Zp
if Yp == 0 or n == 0:
return (0, 0, 1)
if n == 1:
return (Xp, Yp, Zp)
if n < 0 or n >= N:
return jacobianMultiply((Xp, Yp, Zp), n % N, N, A, P)
if (n % 2) == 0:
return jacobianDouble(jacobianMultiply((Xp, Yp, Zp), n // 2, N, A, P), A, P)
if (n % 2) == 1:
return jacobianAdd(jacobianDouble(jacobianMultiply((Xp, Yp, Zp), n // 2, N, A, P), A, P), (Xp, Yp, Zp), A, P)

class PrivateKey:
def __init__(self, curve=sm2p256v1, secret=None):
self.curve = curve
self.secret = secret or SystemRandom().randrange(1, curve.N)

def publicKey(self):
curve = self.curve
xPublicKey, yPublicKey = multiply((curve.Gx, curve.Gy), self.secret, A=curve.A, P=curve.P, N=curve.N)
return PublicKey(xPublicKey, yPublicKey, curve)

def toString(self):
return "{}".format(str(hex(self.secret))[2:].zfill(64))

class PublicKey:
def __init__(self, x, y, curve):
self.x = x
self.y = y
self.curve = curve

def toString(self, compressed=True):
return {
True: str(hex(self.x))[2:],
False: "{}{}".format(str(hex(self.x))[2:].zfill(64), str(hex(self.y))[2:].zfill(64))
}.get(compressed)


if __name__ == "__main__":
priKey = PrivateKey()
pubKey = priKey.publicKey()
print(priKey.toString())
print(pubKey.toString(compressed = False))

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