def getKeys(key):
pr.add('generation keys')
C = [] # константы
F = [] # ячейки Фейстеля
K = [key[:int(len(key) / 2)], key[int(len(key) / 2) :]]
for i in range(32):
if len(hex(i + 1)[2:]) == 1:
C.append(L('0' + hex(i + 1)[2:] + '000000000000000000000000000000').upper())
else:
C.append(L(hex(i + 1)[2:] + '000000000000000000000000000000').upper())
# формирование ячеек Фейстеля
F.append([ K[1], X(L(S(X( K[0], C[0]))), K[1])])
for i in range(32):
K = [ F[i][1], X(L(S(X( F[i][0], C[i]))), F[i][1])]
F.append(K)
# разбиение заданного ключа пополам
K = [key[:int(len(key) / 2)], key[int(len(key) / 2) :]]
# формирование новых ключей из ячеек Фейстеля
for i in range(len(F)):
if (i + 1) % 8 == 0:
K.append(F[i][0])
K.append(F[i][1])
return (K)
def isThereAUserOrNot(username, password):
values = (username, password)
sql = '''SELECT * FROM users WHERE login = ? AND password = ?;'''
cursor.execute(sql, values)
conn.commit()
data = cursor.fetchall()
if len(data) == 1 and data[0] == values:
pr.add('successful login by `' + username + '`')
return (accessed)
else:
pr.add('failed login by `' + username + '`')
return (accessDenied)
def decrypt(path, newPath, key):
pr.add('decrypt file')
f = open(path, 'r')
text = f.read()
f.close()
K = gh.getKeys(transformKey(key))
text = hexToUtf8(gh.decrypt(text, K))
f = open(newPath, 'w')
f.write(text)
f.close()
def encrypt(path, newPath, key):
pr.add('encrypt file')
f = open(path, 'r')
text = f.read()
f.close()
K = gh.getKeys(transformKey(key))
text = gh.encrypt(utf8ToHex(text), K)
f = open(newPath, 'w')
f.write(text)
f.close()
def decrypt(text, K):
pr.add('text decrypt')
textArray = []
for i in range(int(len(text) / 32)):
textArray.append(text[i * 32 : i * 32 + 32])
textDecrypt = []
for j in textArray:
# расшифровка текста
textDecrypted = j
for i in range(9, 0, -1):
textDecrypted = S(L(X(textDecrypted, K[i]), 'reverse'), 'reverse')
textDecrypted = X(textDecrypted, K[0])
textDecrypt.append(textDecrypted)
return(''.join(textDecrypt))
def encrypt(text, K):
pr.add('text encrypt')
count = 32 - len(text) % 32
if count != 0 and count != 32:
for i in range(count):
text += '0'
textArray = []
for i in range(int(len(text) / 32)):
textArray.append(text[i * 32 : i * 32 + 32])
textEncrypt = []
for j in textArray:
# шифрование текста
textEncrypted = j
for i in range(9):
textEncrypted = L(S(X(textEncrypted, K[i])))
textEncrypted = X(textEncrypted, K[9])
textEncrypt.append(textEncrypted)
return(''.join(textEncrypt))
def insertUser(username, password):
pr.add('adding user `' + username + '`')
values = (username, password)
sql = '''INSERT INTO users(login, password) VALUES(?,?);'''
cursor.execute(sql, values)
conn.commit()
def createTableUsers():
pr.add('users table creation')
sql = '''CREATE TABLE users(login text, password text);'''
cursor.execute(sql)
conn.commit()
def utf8ToHex(text):
pr.add('converting text from utf-8 to hex')
text = binascii.hexlify(text.encode('utf8')).decode('utf8')
return text
def readFile(path):
pr.add('reading file')
f = open(path, 'r')
text = f.read()
f.close()
return text
def hexToUtf8(text):
pr.add('converting text from hex to utf-8')
text = binascii.unhexlify(text).decode('utf8')
return text
def writeFile(path, text):
pr.add('writing to file')
f = open(path, 'w')
f.write(text)
f.close()
