moving files

q1/24nov/encryption.py

@@ -0,0 +1,105 @@
+def lecture(nom : str) -> str:
+    """get all character of a file
+
+    :nom: file name
+    :returns: string of the file's content
+
+    """
+    with open(nom, 'r') as file:
+        return file.read()
+
+
+def nettoyage(texte : str) -> str:
+    """clean the text from it's space and uppsercase
+
+    :texte: Sentence to cclean
+    :returns: the string cleaned
+
+    """
+    texte = texte.lower()
+    alphabet = 'abcdefghijklmnopqrstuvwxyz'
+    ret = ''
+    for char in texte:
+        if char in alphabet:
+            ret += char
+    return ret
+
+
+def chiffrement_decalage(texte : str, u : int) -> str:
+    """Encrypt a string with cesar
+
+    :texte: String to encrypt
+    :u: Key for ceasar encryption
+    :returns: encrypted text
+
+    """
+    alphabet = 'abcdefghijklmnopqrstuvwxyz'
+    decalage = dict()
+    for k, l in enumerate(alphabet):
+        decalage[l] = alphabet[(k+u) % len(alphabet)]
+    ret = ''
+    for l in texte:
+        ret += decalage[l]
+    return ret
+
+
+def dechiffrement_decalage(texte, u):
+    """decrypt text encoded with cesar
+
+    :texte: the string to decode
+    :u: ceasar key to decode
+    :returns: the string decoded with the key 
+
+    """
+    return chiffrement_decalage(texte, -u)
+
+
+def chiffrement_substitution(texte, dico):
+    ret = ''
+    for l in texte:
+        if l in dico:
+            ret += dico[l]
+        else:
+            ret += l
+    return ret
+
+
+def dechiffrement_substitution(texte, dico):
+    invert = dict()
+    for k, v in dico.items():
+        invert[v] = k
+    return chiffrement_substitution(texte, invert)
+
+
+
+def file_to_dict(filename):
+    ret = dict()
+    with open(filename) as f:
+        for l in f:
+            ret[l.split()[0]] = l.split()[1]
+    return ret
+
+
+
+if __name__ == "__main__":
+    import sys
+    if(len(sys.argv) == 5):
+        if sys.argv[1] == 'd':
+            if sys.argv[2] == 'c':
+                text = nettoyage(lecture(sys.argv[3]))
+                print(chiffrement_decalage(text, int(sys.argv[4])))
+            if sys.argv[2] == 'd':
+                text = nettoyage(lecture(sys.argv[3]))
+                print(dechiffrement_decalage(text, sys.argv[4]))
+
+        if sys.argv[1] == 's':
+            if sys.argv[2] == 'c':
+                text = nettoyage(lecture(sys.argv[3]))
+                dico = file_to_dict(sys.argv[4])
+                print(chiffrement_substitution(text, dico))
+            if sys.argv[2] == 'd':
+                text = nettoyage(lecture(sys.argv[3]))
+                dico = file_to_dict(sys.argv[4])
+                print(dechiffrement_substitution(text, dico))
+
+