Final version?

app_local/McEliece_console.py

@@ -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): ")

app_local/cryptosystem_core.py

@@ -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
+#these parameters n and k affect the length of the keys, messages and the number of erroneous bytes in the message
-#see the comments below to understand the requirements for n and k
+#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)

app_local/readme.txt

@@ -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.