Add AssetId::from_slice() convenience method

Author: shesek

src/issuance.rs

@@ -18,7 +18,7 @@ use std::io;
 use std::str::FromStr;
 
 use bitcoin::util::hash::BitcoinHash;
-use bitcoin::hashes::{hex, sha256, sha256d, Hash};
+use bitcoin::hashes::{self, hex, sha256, sha256d, Hash};
 
 use encode::{self, Encodable, Decodable};
 use fast_merkle_root::fast_merkle_root;
@@ -54,6 +54,11 @@ impl AssetId {
         self.0
     }
 
+    /// Copies a byte slice into an AssetId object
+    pub fn from_slice(sl: &[u8]) -> Result<AssetId, hashes::Error> {
+        sha256::Midstate::from_slice(sl).map(AssetId)
+    }
+
     /// Generate the asset entropy from the issuance prevout and the contract hash.
     pub fn generate_asset_entropy(
         prevout: OutPoint,