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需求为对文件进行加密，保留哈希，防止别人篡改文件，代码如下：
import time,re,os
from watchdog.events import *
from watchdog.observers import Observer
def rotation_left(x, num):
# 循环左移
num %= 32
left = (x << num) % (2 ** 32)
right = (x >> (32 - num)) % (2 ** 32)
result = left ^ right
return result
def Int2Bin(x, k):
x = str(bin(x)[2:])
result = "0" * (k - len(x)) + x
return result
class SM3:
def __init__(self):
# 常量初始化
self.IV = [0x7380166F, 0x4914B2B9, 0x172442D7, 0xDA8A0600, 0xA96F30BC, 0x163138AA, 0xE38DEE4D, 0xB0FB0E4E]
self.T = [0x79cc4519, 0x7a879d8a]
self.maxu32 = 2 ** 32
self.w1 = [0] * 68
self.w2 = [0] * 64
def ff(self, x, y, z, j):
# 布尔函数FF
result = 0
if j < 16:
result = x ^ y ^ z
elif j >= 16:
result = (x & y) | (x & z) | (y & z)
return result
def gg(self, x, y, z, j):
# 布尔函数GG
result = 0
if j < 16:
result = x ^ y ^ z
elif j >= 16:
result = (x & y) | (~x & z)
return result
def p(self, x, mode):
result = 0
# 置换函数P
# 输入参数X的长度为32bit(=1个字)
# 输入参数mode共两种取值：0和1
if mode == 0:
result = x ^ rotation_left(x, 9) ^ rotation_left(x, 17)
elif mode == 1:
result = x ^ rotation_left(x, 15) ^ rotation_left(x, 23)
return result
def sm3_fill(self, msg):
# 填充消息，使其长度为512bit的整数倍
# 输入参数msg为bytearray类型
# 中间参数msg_new_bin为二进制string类型
# 输出参数msg_new_bytes为bytearray类型
length = len(msg) # msg的长度（单位：byte）
l = length * 8 # msg的长度（单位：bit）
num = length // 64
remain_byte = length % 64
msg_remain_bin = ""
msg_new_bytes = bytearray((num + 1) * 64) ##填充后的消息长度，单位：byte
# 将原数据存储至msg_new_bytes中
for i in range(length):
msg_new_bytes[i] = msg[i]
# remain部分以二进制字符串形式存储
remain_bit = remain_byte * 8 # 单位：bit
for i in range(remain_byte):
msg_remain_bin += "{:08b}".format(msg[num * 64 + i])
k = (448 - l - 1) % 512
while k < 0:
# k为满足 l + k + 1 = 448 % 512 的最小非负整数
k += 512
msg_remain_bin += "1" + "0" * k + Int2Bin(l, 64)
for i in range(0, 64 - remain_byte):
str = msg_remain_bin[i * 8 + remain_bit: (i + 1) * 8 + remain_bit]
temp = length + i
msg_new_bytes[temp] = int(str, 2) # 将2进制字符串按byte为组转换为整数
return msg_new_bytes
def sm3_msg_extend(self, msg):
# 扩展函数: 将512bit的数据msg扩展为132个字（w1共68个字，w2共64个字）
# 输入参数msg为bytearray类型,长度为512bit=64byte
for i in range(0, 16):
self.w1[i] = int.from_bytes(msg[i * 4:(i + 1) * 4], byteorder="big")
for i in range(16, 68):
self.w1[i] = self.p(self.w1[i - 16] ^ self.w1[i - 9] ^ rotation_left(self.w1[i - 3], 15),
1) ^ rotation_left(self.w1[i - 13], 7) ^ self.w1[i - 6]
for i in range(64):
self.w2[i] = self.w1[i] ^ self.w1[i + 4]
# 测试扩展数据w1和w2
# print("w1:")
# for i in range(0, len(self.w1), 8):
# print(hex(self.w1[i]))
# print("w2:")
# for i in range(0, len(self.w2), 8):
# print(hex(self.w2[i]))
def sm3_compress(self, msg):
# 压缩函数
# 输入参数v为初始化参数，类型为bytes/bytearray，大小为256bit
# 输入参数msg为512bit的待压缩数据
self.sm3_msg_extend(msg)
ss1 = 0
A = self.IV[0]
B = self.IV[1]
C = self.IV[2]
D = self.IV[3]
E = self.IV[4]
F = self.IV[5]
G = self.IV[6]
H = self.IV[7]
for j in range(64):
if j < 16:
ss1 = rotation_left((rotation_left(A, 12) + E + rotation_left(self.T[0], j)) % self.maxu32, 7)
elif j >= 16:
ss1 = rotation_left((rotation_left(A, 12) + E + rotation_left(self.T[1], j)) % self.maxu32, 7)
ss2 = ss1 ^ rotation_left(A, 12)
tt1 = (self.ff(A, B, C, j) + D + ss2 + self.w2[j]) % self.maxu32
tt2 = (self.gg(E, F, G, j) + H + ss1 + self.w1[j]) % self.maxu32
D = C
C = rotation_left(B, 9)
B = A
A = tt1
H = G
G = rotation_left(F, 19)
F = E
E = self.p(tt2, 0)
# 测试IV的压缩中间值
# print("j= %d：" % j, hex(A)[2:], hex(B)[2:], hex(C)[2:], hex(D)[2:], hex(E)[2:], hex(F)[2:], hex(G)[2:], hex(H)[2:])
self.IV[0] ^= A
self.IV[1] ^= B
self.IV[2] ^= C
self.IV[3] ^= D
self.IV[4] ^= E
self.IV[5] ^= F
self.IV[6] ^= G
self.IV[7] ^= H
def sm3_update(self, msg):
# 迭代函数
# 输入参数msg为bytearray类型
# msg_new为bytearray类型
msg_new = self.sm3_fill(msg) # msg_new经过填充后一定是512的整数倍
n = len(msg_new) // 64 # n是整数，n>=1
for i in range(0, n):
self.sm3_compress(msg_new[i * 64:(i + 1) * 64])
def sm3_final(self):
digest_str = ""
for i in range(len(self.IV)):
digest_str += hex(self.IV[i])[2:]
return digest_str.upper()
def hashFile(self, filename):
with open(filename, 'rb') as fp:
contents = fp.read()
self.sm3_update(bytearray(contents))
return self.sm3_final()
def getFileName(path):
''' 获取指定目录下的所有指定后缀的文件名 '''
f_list = os.listdir(path)
# print f_list
list = []
for i in f_list:
# os.path.splitext():分离文件名与扩展名
if os.path.splitext(i)[1] == '.tsidx':
list.append(i)
return list
class FileEventHandler(FileSystemEventHandler):
def __init__(self):
FileSystemEventHandler.__init__(self)
def on_created(self, event):
if event.is_directory:
print(event.src_path)
time.sleep(15)
if re.compile("db_\d+_\d+_\d+").findall(event.src_path.split("/")[-1]):
list = getFileName(event.src_path)
for i in range(len(list)):
file_digest = SM3().hashFile(event.src_path + "/" + list[i])
file = open(event.src_path + "/sm3(" + str(i) + ").txt", "a")
file.write(file_digest+ " " + list[i] + "\n")
file.close()
if __name__ == "__main__":
observer = Observer()
event_handler = FileEventHandler()
observer.schedule(event_handler, "/tmp", True)
observer.start()
try:
while True:
time.sleep(1)
except KeyboardInterrupt:
observer.stop()
observer.join()
代码中借鉴了https://blog.csdn.net/weixin_43936250/article/details/105543266的sm3加密，和https://blog.csdn.net/jerry_liufeng/article/details/109603462的目录实时监控
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