diff --git a/Cargo.lock b/Cargo.lock
deleted file mode 100644
index daa8da209..000000000
--- a/Cargo.lock
+++ /dev/null
@@ -1,66 +0,0 @@
-[root]
-name = "ethcore-util"
-version = "0.1.0"
-dependencies = [
- "env_logger 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "aho-corasick"
-version = "0.3.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "memchr 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "env_logger"
-version = "0.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "log 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 0.1.41 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "libc"
-version = "0.1.12"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "libc"
-version = "0.2.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "log"
-version = "0.3.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "libc 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "memchr"
-version = "0.1.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "libc 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "regex"
-version = "0.1.41"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "aho-corasick 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "memchr 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex-syntax 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "regex-syntax"
-version = "0.2.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
diff --git a/Cargo.toml b/Cargo.toml
index f6b0e38a4..0b7032bbb 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,3 +9,5 @@ authors = ["Ethcore <admin@ethcore.io>"]
 [dependencies]
 log = "0.3"
 env_logger = "0.3"
+rustc-serialize = "0.3"
+arrayvec = "0.3"
\ No newline at end of file
diff --git a/src/error.rs b/src/error.rs
new file mode 100644
index 000000000..9dc471f67
--- /dev/null
+++ b/src/error.rs
@@ -0,0 +1,13 @@
+use rustc_serialize::hex::*;
+
+#[derive(Debug)]
+pub enum EthcoreError {
+	FromHex(FromHexError),
+	BadSize
+}
+
+impl From<FromHexError> for EthcoreError {
+	fn from(err: FromHexError) -> EthcoreError {
+		EthcoreError::FromHex(err)
+	}
+}
diff --git a/src/hash.rs b/src/hash.rs
new file mode 100644
index 000000000..295da3900
--- /dev/null
+++ b/src/hash.rs
@@ -0,0 +1,36 @@
+use rustc_serialize::hex::*;
+use error::EthcoreError;
+use std::str::FromStr;
+
+macro_rules! impl_hash {
+	($from: ident, $size: expr) => {
+		#[derive(PartialEq, Debug)]
+		struct $from ([u8; $size]);
+
+		impl FromStr for $from {
+//			type Output = $from;
+			type Err = EthcoreError;
+
+			fn from_str(s: &str) -> Result<$from, EthcoreError> {
+				let a = try!(s.from_hex());
+				if a.len() != $size { return Err(EthcoreError::BadSize); }
+				let mut ret = $from([0;$size]);
+				for i in 0..$size {
+					ret.0[i] = a[i];
+				}
+				Ok(ret)
+			}
+		}
+	}
+}
+
+impl_hash!(Hash64, 8);
+impl_hash!(Hash128, 16);
+impl_hash!(Address, 20);
+impl_hash!(Hash256, 32);
+//impl_hash!(Hash512, 64);
+
+#[test]
+fn it_works() {
+	assert_eq!(Hash64::from_str("0123456789abcdef").unwrap(), Hash64([0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef]));
+}
diff --git a/src/lib.rs b/src/lib.rs
index 17262b3ad..8a65c9873 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,3 +1,7 @@
+extern crate rustc_serialize;
+
+pub mod error;
+pub mod hash;
 pub mod bytes;
 pub mod rlp;