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    extern crate crypto as rcrypto;
    extern crate primitives;
    extern crate siphasher;

    pub use rcrypto::digest::Digest;
    use std::hash::Hasher;
    use rcrypto::sha1::Sha1;
    use rcrypto::sha2::Sha256;
    use rcrypto::ripemd160::Ripemd160;
    use siphasher::sip::SipHasher24;
    use primitives::hash::{H32, H160, H256};

    pub struct DHash160 {
    	sha256: Sha256,
    	ripemd: Ripemd160,
    }

    impl Default for DHash160 {
    	fn default() -> Self {
    		DHash160 {
    			sha256: Sha256::new(),
    			ripemd: Ripemd160::new(),
    		}
    	}
    }

    impl DHash160 {
    	pub fn new() -> Self {
    		DHash160::default()
    	}
    }

    impl Digest for DHash160 {
    	fn input(&mut self, d: &[u8]) {
    		self.sha256.input(d)
    	}

    	fn result(&mut self, out: &mut [u8]) {
    		let mut tmp = [0u8; 32];
    		self.sha256.result(&mut tmp);
    		self.ripemd.input(&tmp);
    		self.ripemd.result(out);
    		self.ripemd.reset();
    	}

    	fn reset(&mut self) {
    		self.sha256.reset();
    	}

    	fn output_bits(&self) -> usize {
    		160
    	}

    	fn block_size(&self) -> usize {
    		64
    	}
    }

    pub struct DHash256 {
    	hasher: Sha256,
    }

    impl Default for DHash256 {
    	fn default() -> Self {
    		DHash256 {
    			hasher: Sha256::new(),
    		}
    	}
    }

    impl DHash256 {
    	pub fn new() -> Self {
    		DHash256::default()
    	}

    	pub fn finish(mut self) -> H256 {
    		let mut result = H256::default();
    		self.result(&mut *result);
    		result
    	}
    }

    impl Digest for DHash256 {
    	fn input(&mut self, d: &[u8]) {
    		self.hasher.input(d)
    	}

    	fn result(&mut self, out: &mut [u8]) {
    		self.hasher.result(out);
    		self.hasher.reset();
    		self.hasher.input(out);
    		self.hasher.result(out);
    	}

    	fn reset(&mut self) {
    		self.hasher.reset();
    	}

    	fn output_bits(&self) -> usize {
    		256
    	}

    	fn block_size(&self) -> usize {
    		64
    	}
    }

    /// RIPEMD160
    #[inline]
    pub fn ripemd160(input: &[u8]) -> H160 {
    	let mut result = H160::default();
    	let mut hasher = Ripemd160::new();
    	hasher.input(input);
    	hasher.result(&mut *result);
    	result
    }

    /// SHA-1
    #[inline]
    pub fn sha1(input: &[u8]) -> H160 {
    	let mut result = H160::default();
    	let mut hasher = Sha1::new();
    	hasher.input(input);
    	hasher.result(&mut *result);
    	result
    }

    /// SHA-256
    #[inline]
    pub fn sha256(input: &[u8]) -> H256 {
    	let mut result = H256::default();
    	let mut hasher = Sha256::new();
    	hasher.input(input);
    	hasher.result(&mut *result);
    	result
    }

    /// SHA-256 and RIPEMD160
    #[inline]
    pub fn dhash160(input: &[u8]) -> H160 {
    	let mut result = H160::default();
    	let mut hasher = DHash160::new();
    	hasher.input(input);
    	hasher.result(&mut *result);
    	result
    }

    /// Double SHA-256
    #[inline]
    pub fn dhash256(input: &[u8]) -> H256 {
    	let mut result = H256::default();
    	let mut hasher = DHash256::new();
    	hasher.input(input);
    	hasher.result(&mut *result);
    	result
    }

    /// SipHash-2-4
    #[inline]
    pub fn siphash24(key0: u64, key1: u64, input: &[u8]) -> u64 {
    	let mut hasher = SipHasher24::new_with_keys(key0, key1);
    	hasher.write(input);
    	hasher.finish()
    }

    /// Data checksum
    #[inline]
    pub fn checksum(data: &[u8]) -> H32 {
    	let mut result = H32::default();
    	result.copy_from_slice(&dhash256(data)[0..4]);
    	result
    }

    #[cfg(test)]
    mod tests {
    	use primitives::bytes::Bytes;
    	use super::{ripemd160, sha1, sha256, dhash160, dhash256, siphash24, checksum};

    	#[test]
    	fn test_ripemd160() {
    		let expected = "108f07b8382412612c048d07d13f814118445acd".into();
    		let result = ripemd160(b"hello");
    		assert_eq!(result, expected);
    	}

    	#[test]
    	fn test_sha1() {
    		let expected = "aaf4c61ddcc5e8a2dabede0f3b482cd9aea9434d".into();
    		let result = sha1(b"hello");
    		assert_eq!(result, expected);
    	}

    	#[test]
    	fn test_sha256() {
    		let expected = "2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824".into();
    		let result = sha256(b"hello");
    		assert_eq!(result, expected);
    	}

    	#[test]
    	fn test_dhash160() {
    		let expected = "b6a9c8c230722b7c748331a8b450f05566dc7d0f".into();
    		let result = dhash160(b"hello");
    		assert_eq!(result, expected);

    		let expected = "865c71bfc7e314709207ab9e7e205c6f8e453d08".into();
    		let bytes: Bytes = "210292be03ed9475445cc24a34a115c641a67e4ff234ccb08cb4c5cea45caa526cb26ead6ead6ead6ead6eadac".into();
    		let result = dhash160(&bytes);
    		assert_eq!(result, expected);
    	}

    	#[test]
    	fn test_dhash256() {
    		let expected = "9595c9df90075148eb06860365df33584b75bff782a510c6cd4883a419833d50".into();
    		let result = dhash256(b"hello");
    		assert_eq!(result, expected);
    	}

    	#[test]
    	fn test_siphash24() {
    		let expected = 0x74f839c593dc67fd_u64;
    		let result = siphash24(0x0706050403020100_u64, 0x0F0E0D0C0B0A0908_u64, &[0; 1]);
    		assert_eq!(result, expected);
    	}

    	#[test]
    	fn test_checksum() {
    		assert_eq!(checksum(b"hello"), "9595c9df".into());
    	}
    }

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