Initial commit

PACKAGE/build/lib/theoEnc/E2EE.py

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+#!/usr/bin/python3
+
+from .otp import encrypt_otp, decrypt_otp
+from .compress import compress, decompress
+from .random import random_string
+
+class E2EE:
+    def __init__(self, seed: str):
+        self.seed = seed
+        self.key = seed
+
+    def get_key(self):
+        return self.key
+
+    def add_compressed_key_part(self, ckeypart: bytes):
+        length = len(ckeypart)
+        ckeypart = decrypt_otp(ckeypart, self.key[length-1:])
+        self.key = self.key[length-1:]  # delete the used part of the full key
+        self.key += decompress(ckeypart)
+        
+    def generate_compressed_key_part(self, length: int, destroy_used_key=True):
+        ckeypart = random_string(length)
+        ckeypart = compress(ckeypart)
+        ckeypart_enc = encrypt_otp(ckeypart, self.key[len(ckeypart)-1:])
+        if destroy_used_key:
+            self.key = self.key[len(ckeypart)-1:] # delete the of the full key which is used now
+        return ckeypart_enc
+
+    def addCKeyPart(self, ckeypart: bytes):
+        self.add_compressed_key_part(ckeypart, length)
+    def generateCKeyPart(self, length: int, destroy_used_key=True):
+        self.generate_compressed_key_part(length, destroy_used_key)

PACKAGE/build/lib/theoEnc/compress.py

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+#!/usr/bin/python3
+
+import sys
+import zlib
+import secrets
+import string
+
+def compress(to_compress: str):
+	ret = zlib.compress(bytes(to_compress, "ascii"), 9)
+	return ret
+
+def decompress(to_decompress: bytes):
+	ret = zlib.decompress(to_decompress)
+	return ret.decode("ascii")

PACKAGE/build/lib/theoEnc/otp.py

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+#!/usr/bin/python3
+
+def encrypt_otp(message: bytes, key: str):
+    if len(message) > len(key): return False;
+    l = []    
+    for counter, i in enumerate(message):
+        l.append(i ^ key.encode()[counter])
+    return bytes(l)
+
+def decrypt_otp(cipher: bytes, key: str):
+    if len(cipher) > len(key): return False;
+    l = []
+    for counter, i in enumerate(cipher):
+        l.append(i ^ key.encode()[counter])
+    return bytes(l)

PACKAGE/build/lib/theoEnc/random.py

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+#!/usr/bin/python3
+
+import secrets
+import string
+
+def random_string(length: int):
+	symbols = string.punctuation + string.ascii_letters + string.digits
+	ret = ""
+	for _ in range(length):
+		ret += secrets.choice(symbols)
+	return ret

PACKAGE/setup.py

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+#!/usr/bin/env python
+
+from __future__ import unicode_literals
+from distutils.core import setup
+
+setup(name='theoEnc',
+      version='1.0',
+      description='Library for using the OTP (OneTimePad) in Python3',
+      author='Benjamin Burkhardt',
+      packages=['theoEnc'])

PACKAGE/theoEnc/E2EE.py

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+#!/usr/bin/python3
+
+from .otp import encrypt_otp, decrypt_otp
+from .compress import compress, decompress
+from .random import random_string
+
+class E2EE:
+    def __init__(self, seed: str):
+        self.seed = seed
+        self.key = seed
+
+    def get_key(self):
+        return self.key
+
+    def add_compressed_key_part(self, ckeypart: bytes):
+        length = len(ckeypart)
+        ckeypart = decrypt_otp(ckeypart, self.key[length-1:])
+        self.key = self.key[length-1:]  # delete the used part of the full key
+        self.key += decompress(ckeypart)
+        
+    def generate_compressed_key_part(self, length: int, destroy_used_key=True):
+        ckeypart = random_string(length)
+        ckeypart = compress(ckeypart)
+        ckeypart_enc = encrypt_otp(ckeypart, self.key[len(ckeypart)-1:])
+        if destroy_used_key:
+            self.key = self.key[len(ckeypart)-1:] # delete the of the full key which is used now
+        return ckeypart_enc
+
+    def addCKeyPart(self, ckeypart: bytes):
+        self.add_compressed_key_part(ckeypart, length)
+    def generateCKeyPart(self, length: int, destroy_used_key=True):
+        self.generate_compressed_key_part(length, destroy_used_key)

PACKAGE/theoEnc/compress.py

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+#!/usr/bin/python3
+
+import sys
+import zlib
+import secrets
+import string
+
+def compress(to_compress: str):
+	ret = zlib.compress(bytes(to_compress, "ascii"), 9)
+	return ret
+
+def decompress(to_decompress: bytes):
+	ret = zlib.decompress(to_decompress)
+	return ret.decode("ascii")

PACKAGE/theoEnc/otp.py

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+#!/usr/bin/python3
+
+def encrypt_otp(message: bytes, key: str):
+    if len(message) > len(key): return False;
+    l = []    
+    for counter, i in enumerate(message):
+        l.append(i ^ key.encode()[counter])
+    return bytes(l)
+
+def decrypt_otp(cipher: bytes, key: str):
+    if len(cipher) > len(key): return False;
+    l = []
+    for counter, i in enumerate(cipher):
+        l.append(i ^ key.encode()[counter])
+    return bytes(l)

PACKAGE/theoEnc/random.py

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+#!/usr/bin/python3
+
+import secrets
+import string
+
+def random_string(length: int):
+	symbols = string.punctuation + string.ascii_letters + string.digits
+	ret = ""
+	for _ in range(length):
+		ret += secrets.choice(symbols)
+	return ret