LABI: tema01 added

1ano/2semestre/labi/tema01/README.md

@@ -5,5 +5,7 @@
 * [Slides](https://github.com/TiagoRG/uaveiro-leci/blob/master/1ano/1semestre/iei/tema01/tema-1-criptografia.pdf)
 * [Guião](https://github.com/TiagoRG/uaveiro-leci/blob/master/1ano/1semestre/iei/tema01/guide-1-cripto.pdf)
 
+### Nota: código bastante incompleto porque a biblioteca do PyCrypto não gosta de trabalhar :skull:
+
 ---
 *Pode conter erros, caso encontre algum, crie um* [*ticket*](https://github.com/TiagoRG/uaveiro-leci/issues/new)

1ano/2semestre/labi/tema01/src/aes_cypher.py

@@ -0,0 +1,12 @@
+import os
+import sys
+from Crypto.Cipher import AES
+
+
+def main(args=None):
+    cipher = AES.new(os.urandom(16), AES.MODE_ECB)
+    print(cipher.encrypt(b'Hello World!'))
+
+
+if __name__ == '__main__':
+    main(sys.argv[1:])

1ano/2semestre/labi/tema01/src/hash_lib.py

@@ -0,0 +1,16 @@
+import hashlib
+import sys
+
+
+def main(args=None):
+    with open(args[0], 'rb') as f:
+        buffer = f.read(512)
+        h = hashlib.sha1()
+        while len(buffer) > 0:
+            h.update(buffer)
+            buffer = f.read(512)
+        print(h.hexdigest())
+
+
+if __name__ == '__main__':
+    main(sys.argv[1:])

1ano/2semestre/labi/tema01/src/pycrypto.py

@@ -0,0 +1,14 @@
+import sys
+from Crypto.Hash import SHA256
+
+
+def main(args=None):
+    with open(args[0], 'rb') as f:
+        buffer = f.read()
+        h = SHA256.new()
+        h.update(buffer)
+        print(h.hexdigest())
+
+
+if __name__ == '__main__':
+    main(sys.argv[1:])

1ano/2semestre/labi/tema01/src/stream_cyphers.py

@@ -0,0 +1,22 @@
+# Screw 1.4 :skull:
+import codecs
+import os
+import sys
+from Crypto.Cipher import ARC4
+
+
+def main(args=None):
+    with open(args[0], 'r') as f:
+        text = f.read(2048)
+    cipher = ARC4.new(bit_array_from_str(args[1]))
+    cryptogram = cipher.encrypt(text)
+    os.write(1, cryptogram)
+    print()
+
+
+def bit_array_from_str(s):
+    return [codecs.encode("hex") for elem in s]
+
+
+if __name__ == '__main__':
+    main(sys.argv[1:])