doc/cover-page.tex

@@ -1,33 +0,0 @@
-\documentclass[%
-  a4paper,%
-  12pt,% <10pt, 9pt>
-  %style=screen,
-  %sender=bottom,
-  blue,% <orange, green, violet>
-  %rgb, <cmyk>
-  %mono,
-  %extramargin,
-  %marginleft, <marginright>
-  ]{tubsartcl}
-\usepackage[utf8x]{inputenc}
-
-\usepackage[ngerman]{babel}
-
-\usepackage{lipsum} % Blindtext-Paket
-
-% Titelseiten-Elemente
-\title{Introduction to IT-Security WS 20/21}
-\subtitle{Exercise 00}
-\author{Eggert Jung}
-
-\begin{document}
-
-\maketitle%[<plain/image/imagetext>,<logo=left/right>]
-\begin{tabular}{rl}
-  \textbf{GITZ Kennung}:    & y0085044 \\
-  \textbf{Matrikelnr.}:     & 4839284  \\
-  \textbf{Studiengang}:     & IST Bachelor  \\
-  \textbf{Prüfungsordnung}: & 5  \\
-\end{tabular}
-
-\end{document}

src/sectubs/exercises.py

@@ -1,6 +1,5 @@
 import datetime
 
-
 class Exercise00:
     STUDENT_NAME = "Eggert Jung"
 
@@ -39,43 +38,39 @@ class Exercise00:
     def __str__(self):
         return b64_enc(self.__txt)
 
+def b64_enc_map(index):
+    if(index >= 0  and index < 26):
+        return chr(index + 0x41) # A-Z
+    elif(index >= 26 and index < 52):
+        return chr(index + 0x61 - 26) # a-z
+    elif(index >= 52 and index < 62):
+        return chr(index + 0x30 - 52) # 0-9
+    elif(index == 62):
+        return '+'
+    elif(index == 63):
+        return '/'
+    else:
+        return '='
 
 def b64_enc(str):
     res = ""
-    b64_map = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="
+
     for c in [(str[i:i+3]) for i in range(0, len(str), 3)]:
         c = bytes(c, 'utf-8')
-        bits = [64, 64, 64, 64]
+        bits = [-1,-1,-1,-1]
         try:
-            bits[0] = (c[0] & 0xFC) >> 2
+            bits[0] = (c[0] & 0xFC)>>2
 
-            bits[1] = ((c[0] & 0x03) << 4)
-            bits[1] = bits[1] + ((c[1] & 0xF0) >> 4)
+            bits[1] = ((c[0] & 0x03)<<4)
+            bits[1] = bits[1] + ((c[1] & 0xF0)>>4)
 
-            bits[2] = ((c[1] & 0x0F) << 2)
-            bits[2] = bits[2] + ((c[2] & 0xC0) >> 6)
+            bits[2] = ((c[1] & 0x0F)<<2)
+            bits[2] = bits[2] + ((c[2] & 0xC0)>>6)
 
             bits[3] = (c[2] & 0x3F)
         except IndexError:
             pass
         for i in range(4):
-            res = res + b64_map[bits[i]]
+            res = res + b64_enc_map(bits[i])
     return res
 
-
-if __name__ == "__main__":
-    import argparse
-    parser = argparse.ArgumentParser()
-    parser.add_argument('FILE', help="The input positional parameter.")
-    parser.add_argument('-b', '--bool', action='store_true',
-                        help="An optional boolean flag (Default: False).")
-    parser.add_argument('-f', '--float', default=0.0, type=float,
-                        help="An optional parameter of type float (Default: 0.0).")
-    parser.add_argument('-i', '--int', default=0, type=int,
-                        help="An optional parameter of type int (Default: 0).")
-
-    args = parser.parse_args()
-    print(
-        "input: {FILE}\n--bool {bool}\n--float {float}\n--int {int}".format(**args.__dict__))
-
-    exit(42)