1 files changed, 45 insertions, 0 deletions
diff --git a/server/fantacrypt.py b/server/fantacrypt.py
new file mode 100644
index 00000000..e31548e7
--- /dev/null
+++ b/server/fantacrypt.py
@@ -0,0 +1,45 @@
+# tsuserver3, an Attorney Online server
+#
+# Copyright (C) 2016 argoneus <argoneuscze@gmail.com>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# fantacrypt was a mistake, just hardcoding some numbers is good enough
+
+import binascii
+
+CRYPT_CONST_1 = 53761
+CRYPT_CONST_2 = 32618
+CRYPT_KEY = 5
+
+
+def fanta_decrypt(data):
+    data_bytes = [int(data[x:x + 2], 16) for x in range(0, len(data), 2)]
+    key = CRYPT_KEY
+    ret = ''
+    for byte in data_bytes:
+        val = byte ^ ((key & 0xffff) >> 8)
+        ret += chr(val)
+        key = ((byte + key) * CRYPT_CONST_1) + CRYPT_CONST_2
+    return ret
+
+
+def fanta_encrypt(data):
+    key = CRYPT_KEY
+    ret = ''
+    for char in data:
+        val = ord(char) ^ ((key & 0xffff) >> 8)
+        ret += binascii.hexlify(val.to_bytes(1, byteorder='big')).decode().upper()
+        key = ((val + key) * CRYPT_CONST_1) + CRYPT_CONST_2
+    return ret