just for now

week06/easy/test.py

@@ -0,0 +1,36 @@
+import random
+from Crypto.Util.number import getPrime, inverse
+from Crypto.Util.number import inverse
+
+
+def moc_encryption_message(p, q):
+    message = int.from_bytes("flaggy".encode(), 'big')
+    print("original message: ", message)
+    c = pow(message,p,q)
+    return c
+
+
+def modular_inverse(p, phi_q):
+    x = inverse(p, phi_q)
+    return x % phi_q
+
+def decrypt_message(encrypted, p, q):
+    phi_q = q - 1
+    d = modular_inverse(p, phi_q)
+    message = pow(encrypted, d, q)
+    return message
+    
+
+if __name__ == "__main__":
+    bit_length = 992
+    o = getPrime(bit_length*2)
+    q = getPrime(bit_length*2)
+    e, n = int(o), int(q)
+    if not (bit_length * 2 - 1 <= n.bit_length() <= bit_length * 2): # has to be not
+        print("wrong bit count")
+    c = moc_encryption_message(o, q)
+    m = decrypt_message(c, o, q)
+    print("decrypted message: ", m)
+    byte_length = (m.bit_length() + 7) // 8
+    decoded_string = m.to_bytes(byte_length, 'big').decode()
+    print("Decrypted_message_to_string: ", decoded_string)