diff --git a/Cargo.lock b/Cargo.lock
index 9a87f48..0e26368 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -200,6 +200,7 @@ name = "destools"
 version = "0.1.0"
 dependencies = [
  "base64 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfb-mode 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "des 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "pbr 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/Cargo.toml b/Cargo.toml
index 3f3962f..8e1d9bb 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -17,4 +17,5 @@ base64 = "0.11.0"
 rayon = "1.3.0"
 pbr = "1.0.2"
 spinners = "1.2.0"
-regex = "1.3.4"
\ No newline at end of file
+regex = "1.3.4"
+byteorder = "1.3.4"
diff --git a/src/lib/mod.rs b/src/lib/mod.rs
index 58298f6..ff53bc6 100644
--- a/src/lib/mod.rs
+++ b/src/lib/mod.rs
@@ -1,2 +1,3 @@
 pub mod crypt;
-pub mod hash;
\ No newline at end of file
+pub mod hash;
+pub mod rainbowutils;
diff --git a/src/lib/rainbowutils.rs b/src/lib/rainbowutils.rs
new file mode 100644
index 0000000..5b370b4
--- /dev/null
+++ b/src/lib/rainbowutils.rs
@@ -0,0 +1,120 @@
+use byteorder::{BigEndian, ByteOrder, ReadBytesExt};
+use rand::AsByteSliceMut;
+use std::collections::HashMap;
+use std::fs::File;
+use std::io::{BufReader, Read};
+use std::io::{Error, ErrorKind};
+
+pub const BDF_HDR: &[u8; 11] = b"BDF\x01RAINBOW";
+pub const NULL_BYTES: &[u8; 4] = &[0u8; 4];
+
+pub struct BinaryDictionaryFile {
+    name: String,
+    reader: BufReader<File>,
+    metadata: Option<MetaChunk>,
+}
+
+#[derive(Debug, Clone)]
+pub struct GenericChunk {
+    length: u32,
+    name: String,
+    data: Vec<u8>,
+    crc: u32,
+}
+
+#[derive(Debug, Clone)]
+pub struct MetaChunk {
+    chunk_count: u32,
+    entries_per_chunk: u32,
+    entry_count: u32,
+    compression_method: Option<String>,
+}
+
+#[derive(Debug, Clone)]
+pub struct HashEntry {
+    id: u32,
+    output_length: u32,
+    name: String,
+}
+
+#[derive(Debug, Clone)]
+pub struct DataEntry {
+    plain: String,
+    hashes: HashMap<String, Vec<u8>>,
+}
+
+impl BinaryDictionaryFile {
+    fn new(reader: BufReader<File>) -> Self {
+        Self {
+            name: "".to_string(),
+            metadata: None,
+            reader,
+        }
+    }
+
+    fn read_metadata(&mut self) -> Result<MetaChunk, Error> {
+        if !self.validate_header() {
+            return Err(Error::new(ErrorKind::InvalidData, "Invalid BDF Header!"));
+        }
+        let meta_chunk = self.next_chunk().as_meta_chunk();
+        self.metadata = Some(meta_chunk.clone());
+
+        Ok(meta_chunk)
+    }
+
+    fn validate_header(&mut self) -> bool {
+        let mut header = [0u8; 11];
+        let _ = self.reader.read(&mut header);
+
+        header == BDF_HDR.as_ref()
+    }
+
+    fn next_chunk(&mut self) -> GenericChunk {
+        let mut length_raw = [0u8; 4];
+        let _ = self.reader.read(&mut length_raw);
+        let length = BigEndian::read_u32(&mut length_raw);
+        let mut name_raw = [0u8; 4];
+        let _ = self.reader.read(&mut name_raw);
+        let name =
+            String::from_utf8(name_raw.to_vec()).expect("Failed to parse chunk name to string!");
+        let mut data = vec![0u8; length as usize];
+        let _ = self.reader.read(&mut data);
+        let mut crc_raw = [0u8; 4];
+        let _ = self.reader.read(&mut crc_raw);
+        let crc = BigEndian::read_u32(&mut crc_raw);
+
+        GenericChunk {
+            length,
+            name,
+            data,
+            crc,
+        }
+    }
+}
+
+impl GenericChunk {
+    fn as_meta_chunk(&self) -> MetaChunk {
+        let mut chunk_count_raw = self.data[0..4].to_vec();
+        let mut entries_per_chunk = self.data[4..8].to_vec();
+        let mut total_number_of_entries = self.data[8..12].to_vec();
+        let mut compression_method_raw = self.data[12..16].to_vec();
+        let chunk_count = BigEndian::read_u32(&mut chunk_count_raw);
+        let entries_per_chunk = BigEndian::read_u32(&mut entries_per_chunk);
+        let entry_count = BigEndian::read_u32(&mut total_number_of_entries);
+        let compression_method = if &compression_method_raw != NULL_BYTES {
+            Some(
+                String::from_utf8(compression_method_raw.to_vec())
+                    .expect("Failed to parse compression method from meta string"),
+            )
+        } else {
+            None
+        };
+
+        MetaChunk {
+            chunk_count,
+            entries_per_chunk,
+            entry_count,
+            compression_method,
+        }
+    }
+}