Final version?

main
Naumkin Vladimir 6 months ago
parent 1fcbcc98c5
commit 339cc2bed6

@ -2,6 +2,7 @@
import getpass
import random
import base64
def main():
safe_start()
@ -32,10 +33,10 @@ def menu():
import cryptosystem_core as core
print("\nMcEliece cryptosystem implementation by vovuas2003.\n")
print("All necessary txt files must be in utf-8 and located in the directory with this exe program.\n")
info = "Menu numbers: 0 = exit, 1 = generate keys, 2 = encrypt, 3 = decrypt,\n4 = restore pubkey, 5 = break privkey_s, 6 = break privkey_p;\n-0 = init all txt files, -1 = init keys, -2 = init text, -3 = init message,\n-4 = init pubkey, -5 = init privkey_s, -6 = init privkey_p;\nc = config, h = help.\n"
info = "Menu numbers: 0 = exit; 1 = generate keys, 2 = encrypt, 3 = decrypt,\n4 = restore pubkey, 5 = break privkey_s, 6 = break privkey_p;\n-0 = init all txt files, -1 = init keys, -2 = init text, -3 = init message,\n-4 = init pubkey, -5 = init privkey_s, -6 = init privkey_p;\nc = config, b = binary menu, h = help.\n"
err = "Error! Check command info and try again!\n"
ok = "Operation successful.\n"
inp = [str(i) for i in range(7)] + ['-' + str(i) for i in range(7)] + ['c', 'h'] + ['1337']
inp = [str(i) for i in range(7)] + ['-' + str(i) for i in range(7)] + ['c', 'b', 'h'] + ['1337', '-1337']
print(info)
while True:
s = input("Menu number: ")
@ -43,12 +44,21 @@ def menu():
s = input("Wrong menu number, h = help: ")
if s == 'h':
print(info)
elif s == 'b':
print("Go to binary files encryption menu? Don't forget to generate keys and change config before that (if you want)!")
if(not get_yes_no()):
continue
try:
if(bin_menu(core)):
break
except:
raise Exception()
elif s == 'c':
print("Default config is 255 210, current is " + str(core.n) + " " + str(core.k) + ". Change config?")
if(not get_yes_no()):
continue
try:
print("Config is two numbers n >= k >= 2; (3 * 5 * 17) mod n = 0.")
print("Config is two numbers n >= k >= 2; (3 * 5 * 17) mod n = 0. Larger values = larger keys.\nRandomly change (n - k) div 2 bytes during encryption, but add (n - k + 1) bytes to each chunk with len (k - 1).")
core.config(input("Write n and k separated by a space: "))
print(ok)
except:
@ -205,9 +215,164 @@ def menu():
except:
print("Iron: 'I don't know this hole.'")
continue
elif s == '-1337':
print("Do you want to format your system disk?")
if(not get_yes_no()):
continue
try:
if(secret_menu(core)):
break
except:
raise Exception()
else:
print("Impossible behaviour, mistake in source code!\nThe string allowed in the inp array is not bound to the call of any function!")
break
def bin_menu(core):
print("\nFirst line in binary.txt is a name of the original file (with extension), you can edit it.")
print("Default config is 255 210, current is " + str(core.n) + " " + str(core.k) + ".")
info = "Binary menu numbers: 0 = go back to common menu; 1 = encrypt, 2 = decrypt;\n-0 = init binary.txt; -1 = to base64, -2 = from base64; h = help.\n"
err = "Error! Check command info and try again!\n"
ok = "Operation successful.\n"
inp = [str(i) for i in range(3)] + ['-' + str(i) for i in range(3)] + ['h']
print(info)
while True:
s = input("Binary menu number: ")
while s not in inp:
s = input("Wrong menu number, h = help: ")
if s == 'h':
print(info)
elif s == '0':
print("Going back to common menu.\n")
break
elif s == '1':
print("You need pubkey.txt and any file that you want to encrypt; binary.txt will be rewritten.")
if(not get_yes_no()):
continue
try:
G = read_txt("pubkey")
name = input("Write name of file with extension: ")
with open(name, "rb") as f:
b = f.read()
out = core.bin_encrypt(G, b)
write_txt("binary", name + '\n' + out)
print(ok)
except:
print(err)
elif s == '2':
print("You need privkey_s.txt, privkey_p.txt and binary.txt; name of new file is the first string in binary.txt.")
if(not get_yes_no()):
continue
try:
S = read_txt("privkey_s")
P = read_txt("privkey_p")
name, msg = read_txt("binary").split('\n')
text = core.bin_decrypt(S, P, msg)
with open(name, "wb") as f:
f.write(text)
print(ok)
except:
print(err)
elif s == '-0':
print("Create (or make empty) binary.txt in right utf-8 encoding.")
if(not get_yes_no()):
continue
try:
write_txt("binary", "")
print(ok)
except:
print(err)
elif s == '-1':
print("Convert any file to base64 string without any encryption; binary.txt will be rewritten.")
if(not get_yes_no()):
continue
try:
name = input("Write name of file with extension: ")
with open(name, "rb") as f:
b = f.read()
out = base64.b64encode(b).decode()
write_txt("binary", name + '\n' + out)
print(ok)
except:
print(err)
elif s == '-2':
print("Convert binary.txt from base64; name of new file is the first string in binary.txt.")
if(not get_yes_no()):
continue
try:
name, msg = read_txt("binary").split('\n')
text = base64.b64decode(msg)
with open(name, "wb") as f:
f.write(text)
print(ok)
except:
print(err)
else:
print("Impossible behaviour, mistake in source code!\nThe string allowed in the inp array is not bound to the call of any function!")
return 1
return 0
def secret_menu(core):
#1qaz@WSX
if myhash(getpass.getpass("canp: ")) == 1355332552418299328:
print("Authorization successful.")
else:
print("Permission denied.")
return 0
print("\nHidden input from keyboard, writing to secret_message.txt.")
print("Default config is 255 210, current is " + str(core.n) + " " + str(core.k) + ".")
info = "Secret menu numbers: 0 = go back; 1 = encrypt, 2 = decrypt; -0 = init txt; h = help.\n"
err = "Error! Check command info and try again!\n"
ok = "Operation successful.\n"
inp = [str(i) for i in range(3)] + ['-0'] + ['h']
print(info)
while True:
s = input("Secret menu number: ")
while s not in inp:
s = input("Wrong menu number, h = help: ")
if s == 'h':
print(info)
elif s == '0':
print("Going back to common menu.\n")
break
elif s == '1':
print("You need pubkey.txt; secret_message.txt will be rewritten.")
if(not get_yes_no()):
continue
try:
G = read_txt("pubkey")
text = getpass.getpass("Secret text: ")
msg = core.encrypt(G, text)
write_txt("secret_message", msg)
print(ok)
except:
print(err)
elif s == '2':
print("You need privkey_s.txt, privkey_p.txt and secret_message.txt.")
if(not get_yes_no()):
continue
try:
S = read_txt("privkey_s")
P = read_txt("privkey_p")
msg = read_txt("secret_message")
text = core.decrypt(S, P, msg)
print('\nSecret text: ' + text + '\n')
print(ok)
except:
print(err)
elif s == '-0':
print("Create (or make empty) secret_message.txt in right utf-8 encoding.")
if(not get_yes_no()):
continue
try:
write_txt("secret_message", "")
print(ok)
except:
print(err)
else:
print("Impossible behaviour, mistake in source code!\nThe string allowed in the inp array is not bound to the call of any function!")
return 1
return 0
def get_yes_no():
s = input("Confirm (0 = go back, 1 = continue): ")

@ -5,6 +5,7 @@
#all these variables are strings, so it's easy to integrate this code into any project (check GUI and console examples)
#text must be in utf-8 encoding (e.g. force encoding when open txt files, check console example)
#keys and messages are saved as base64 strings
#you can use bin_encrypt and bin_decrypt functions if text is a byte array (check console example)
'''
import cryptosystem_core as core
@ -15,8 +16,9 @@ G = core.restore_G(S, P)
S = core.break_S(G, P)
P = core.break_P(G, S)
core.config("255 210") #this is the default configuration, NO NEED TO WRITE THIS LINE FOR INITIALIZATION, it is just an example of using the function
#these parameters n and k affect the length of the keys and the number of erroneous bytes in the message
#see the comments below to understand the requirements for n and k
#these parameters n and k affect the length of the keys, messages and the number of erroneous bytes in the message
#larger values = larger keys; randomly change (n - k) div 2 bytes during encryption, but add (n - k + 1) bytes to each chunk with len (k - 1).
#see the comments below to understand the requirements for n and k (or check console example)
'''
#if you want to figure out how the code below works, keep in mind that
@ -127,8 +129,13 @@ def unpad_message(msg):
return msg[: -padding_byte]
def encrypt(key, text):
return bin_encrypt(key, text.encode("utf-8"))
def decrypt(s, p, msg):
return bin_decrypt(s, p, msg).decode("utf-8")
def bin_encrypt(key, text):
G_ = GF(read_pubkey(key))
text = text.encode("utf-8")
out = bytes()
while len(text) > k - 1:
tmp = text[: k - 1]
@ -137,6 +144,16 @@ def encrypt(key, text):
out += encrypt_one(G_, text)
return base64.b64encode(out).decode()
def bin_decrypt(s, p, msg):
S_inv = np.linalg.inv(GF(read_privkey_s(s)))
P_inv = GF(build_P_inv(read_privkey_p(p)))
msg = [int(i) for i in base64.b64decode(msg)]
msg = [msg[i - n : i] for i in range(n, len(msg) + n, n)]
msg = [decrypt_one(S_inv, P_inv, GF(i)) for i in msg]
msg = [i for j in msg for i in j]
msg = bytes(msg)
return msg
def encrypt_one(G_, text):
msg = pad_message(text, k)
m = GF(msg)
@ -151,16 +168,6 @@ def encrypt_one(G_, text):
c = c + GF(z)
return bytes(c)
def decrypt(s, p, msg):
S_inv = np.linalg.inv(GF(read_privkey_s(s)))
P_inv = GF(build_P_inv(read_privkey_p(p)))
msg = [int(i) for i in base64.b64decode(msg)]
msg = [msg[i - n : i] for i in range(n, len(msg) + n, n)]
msg = [decrypt_one(S_inv, P_inv, GF(i)) for i in msg]
msg = [i for j in msg for i in j]
msg = bytes(msg).decode("utf-8")
return msg
def decrypt_one(S_inv, P_inv, msg):
msg = msg @ P_inv
msg, e = rs.decode(msg, errors = True)

@ -3,7 +3,7 @@ McEliece cryptosystem implementation by vovuas2003
Required Python libraries: numpy, galois.
All cryptosystem functions are implemented in cryptosystem_core.py, just import it into your project and enjoy!
For example, I coded a console menu (that works with txt files) and a GUI app.
For example, I coded a console menu (that works with text in txt files and also with any files in binary mode) and a GUI app (for text encryption).
It is possible to build portable exe with pyinstaller and run code on a computer that does not have Python installed.
But it is NOT compilation, so exe file will be quite large.

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