Release 6.9.0

Data/Scripts/001_Technical/000_Encryption.rb

@@ -2,7 +2,22 @@ module Encryption
   ENCRYPTION_KEY = [0x4A, 0x8F, 0x2C, 0xE1, 0x73, 0xB5, 0x96, 0x0D,
                     0x5E, 0xA2, 0x3F, 0xC7, 0x81, 0x14, 0x6B, 0xD9]
 
+  CHUNK_SIZE = 1 << 20
+
   def self.xor(data)
-    data.bytes.each_with_index.map { |b, i| b ^ ENCRYPTION_KEY[i % ENCRYPTION_KEY.length] }.pack("C*")
+    key = ENCRYPTION_KEY.pack("C*")
+    @full_chunk_key ||= (key * (CHUNK_SIZE / key.length)).unpack1("H*").to_i(16)
+    full_chunk_key = @full_chunk_key
+    result = String.new(capacity: data.bytesize, encoding: Encoding::BINARY)
+    offset = 0
+    while offset < data.bytesize
+      chunk = data.byteslice(offset, CHUNK_SIZE)
+      size = chunk.bytesize
+      chunk_key = size == CHUNK_SIZE ? full_chunk_key : (key * (size / key.length + 1)).byteslice(0, size).unpack1("H*").to_i(16)
+      xored = chunk.unpack1("H*").to_i(16) ^ chunk_key
+      result << [xored.to_s(16).rjust(size * 2, "0")].pack("H*")
+      offset += CHUNK_SIZE
+    end
+    return result
   end
-end
+end