diff --git a/src/keccak.rs b/src/keccak.rs
index e90339c..cc2327e 100644
--- a/src/keccak.rs
+++ b/src/keccak.rs
@@ -108,6 +108,83 @@ fn keccakf(st: &mut [Chunk], rounds: usize)
     }
 }
 
+fn temporary_shim(state: &mut [Byte]) {
+    assert_eq!(state.len(), 200);
+
+    let mut chunks = Vec::with_capacity(25);
+    for i in 0..25 {
+        let i = i * 8;
+
+        chunks.push(Chunk::from(&state[i..i+8]));
+    }
+
+    keccakf(&mut chunks, 24);
+
+    for (i, bit) in chunks.iter().flat_map(|c| c.bits.iter()).enumerate() {
+        state[i / 8].bits[i % 8] = bit.clone();
+    }
+}
+
+fn sha3_256(message: &[Byte]) -> Vec<Byte> {
+    keccak(1088, 512, message, 0x06, 32)
+}
+
+fn keccak(rate: usize, capacity: usize, mut input: &[Byte], delimited_suffix: u8, mut mdlen: usize)
+    -> Vec<Byte>
+{
+    use std::cmp::min;
+
+    let mut st: Vec<Byte> = Some(Bit::byte(0)).into_iter().cycle().take(200).collect();
+
+    let rateInBytes = rate / 8;
+    let mut inputByteLen = input.len();
+    let mut blockSize = 0;
+
+    if ((rate + capacity) != 1600) || ((rate % 8) != 0) {
+        panic!("invalid parameters");
+    }
+
+    while inputByteLen > 0 {
+        blockSize = min(inputByteLen, rateInBytes);
+
+        for i in 0..blockSize {
+            st[i] = st[i].xor(&input[i]);
+        }
+
+        input = &input[blockSize..];
+        inputByteLen -= blockSize;
+
+        if blockSize == rateInBytes {
+            temporary_shim(&mut st);
+            blockSize = 0;
+        }
+    }
+
+    st[blockSize] = st[blockSize].xor(&Bit::byte(delimited_suffix));
+
+    if ((delimited_suffix & 0x80) != 0) && (blockSize == (rateInBytes-1)) {
+        temporary_shim(&mut st);
+    }
+
+    st[rateInBytes-1] = st[rateInBytes-1].xor(&Bit::byte(0x80));
+
+    temporary_shim(&mut st);
+
+    let mut output = Vec::with_capacity(mdlen);
+
+    while mdlen > 0 {
+        blockSize = min(mdlen, rateInBytes);
+        output.extend_from_slice(&st[0..blockSize]);
+        mdlen -= blockSize;
+
+        if mdlen > 0 {
+            temporary_shim(&mut st);
+        }
+    }
+
+    output
+}
+
 fn keccak256(input: &[Byte]) -> Vec<Bit> {
     assert_eq!(input.len(), 144);
 
@@ -226,10 +303,22 @@ enum Bit {
     Constant(u8)
 }
 
+#[derive(Clone, Debug, PartialEq)]
 struct Byte {
     bits: Vec<Bit>
 }
 
+impl Byte {
+    fn xor(&self, other: &Byte) -> Byte {
+        Byte {
+            bits: self.bits.iter()
+                           .zip(other.bits.iter())
+                           .map(|(a, b)| a.xor(b))
+                           .collect()
+        }
+    }
+}
+
 impl Bit {
     fn byte(byte: u8) -> Byte {
         Byte {
@@ -267,6 +356,44 @@ impl Bit {
     }
 }
 
+#[test]
+fn test_shim() {
+    let mut chunks: Vec<_> = (0..25).map(|_| Chunk::from(0xABCDEF0123456789)).collect();
+    keccakf(&mut chunks, 24);
+
+    let mut bytes: Vec<Byte> = (0..200).map(|i| {
+        match i % 8 {
+            0 => Bit::byte(0xAB),
+            1 => Bit::byte(0xCD),
+            2 => Bit::byte(0xEF),
+            3 => Bit::byte(0x01),
+            4 => Bit::byte(0x23),
+            5 => Bit::byte(0x45),
+            6 => Bit::byte(0x67),
+            7 => Bit::byte(0x89),
+            _ => unreachable!()
+        }
+    }).collect();
+
+    temporary_shim(&mut bytes);
+
+    for (i, bit) in bytes.iter().flat_map(|c| c.bits.iter()).enumerate() {
+        //println!("i = {}", i);
+        if &chunks[i / 64].bits[i % 64] != bit {
+            panic!("fuck.");
+        }
+    }
+}
+
+#[test]
+fn woohoo() {
+    let message = [Bit::byte(0x30)];
+    let test = sha3_256(&message);
+
+    println!("{:?}", test);
+    assert!(test[0] == Bit::byte(0xf9));
+}
+
 #[test]
 fn testsha3() {
     let bb = |x: usize| {