add calc_hash

btc-address/src/main.rs

@@ -70,13 +70,14 @@ fn make_btc_address(public_key: &PublicKey) -> String {
 }
 
 fn calc_sha256(i: &[u8]) -> Vec<u8> {
-    let mut hasher = Sha256::default();
-    hasher.input(&i);
-    hasher.fixed_result().to_vec()
+    calc_hash(Sha256::default(), i)
 }
 
 fn calc_ripemd160(i: &[u8]) -> Vec<u8> {
-    let mut hasher = Ripemd160::default();
+    calc_hash(Ripemd160::default(), i)
+}
+
+fn calc_hash<T>(mut hasher: T, i: &[u8]) -> Vec<u8> where T: Input + FixedOutput {
     hasher.input(&i);
     hasher.fixed_result().to_vec()
 }