Add `from_script` method to Address for generating P2SH addresses

Cargo.toml

@@ -1,7 +1,7 @@
 
 [package]
 name = "bitcoin"
-version = "0.3.3"
+version = "0.3.4"
 authors = ["Andrew Poelstra <apoelstra@wpsoftware.net>"]
 license = "CC0-1.0"
 homepage = "https://github.com/apoelstra/rust-bitcoin/"

src/util/address.rs

@@ -63,6 +63,16 @@ impl Address {
         }
     }
 
+    /// Creates a P2SH address from a script
+    #[inline]
+    pub fn from_script(network: Network, script: &script::Script) -> Address {
+        Address {
+            ty: Type::ScriptHash,
+            network: network,
+            hash: Hash160::from_data(&script[..])
+        }
+    }
+
     /// Generates a script pubkey spending to this address
     #[inline]
     pub fn script_pubkey(&self) -> script::Script {
@@ -253,6 +263,15 @@ mod tests {
         assert_eq!(FromBase58::from_base58check("33iFwdLuRpW1uK1RTRqsoi8rR4NpDzk66k"), Ok(addr));
     }
 
+    #[test]
+    fn test_p2sh_parse() {
+        let script = hex_script!("552103a765fc35b3f210b95223846b36ef62a4e53e34e2925270c2c7906b92c9f718eb2103c327511374246759ec8d0b89fa6c6b23b33e11f92c5bc155409d86de0c79180121038cae7406af1f12f4786d820a1466eec7bc5785a1b5e4a387eca6d797753ef6db2103252bfb9dcaab0cd00353f2ac328954d791270203d66c2be8b430f115f451b8a12103e79412d42372c55dd336f2eb6eb639ef9d74a22041ba79382c74da2338fe58ad21035049459a4ebc00e876a9eef02e72a3e70202d3d1f591fc0dd542f93f642021f82102016f682920d9723c61b27f562eb530c926c00106004798b6471e8c52c60ee02057ae");
+        let addr = Address::from_script(Testnet, &script);
+
+        assert_eq!(&addr.to_base58check(), "2N3zXjbwdTcPsJiy8sUK9FhWJhqQCxA8Jjr");
+        assert_eq!(FromBase58::from_base58check("2N3zXjbwdTcPsJiy8sUK9FhWJhqQCxA8Jjr"), Ok(addr));
+    }
+
     #[test]
     fn test_key_derivation() {
         // testnet compressed