working sha256

src/hashes/sha256.rs

@@ -1,20 +1,27 @@
 use super::*;
+use ::sha2::{Digest, Sha256};
 
 pub struct SHA256 {
     hash: BITS256,
+    hasher: Sha256,
 }
 
 impl Hasher for SHA256 {
     fn new() -> Self {
-        SHA256 { hash: [0; 32] }
+        SHA256 {
+            hash: [0; 32],
+            hasher: Sha256::new(),
+        }
     }
 
     fn digest(&mut self, bytes: impl AsRef<[u8]>) {
-        todo!()
+        self.hasher.update(bytes)
     }
 
-    fn complete(self) -> HashReturn {
+    fn complete(mut self) -> HashReturn {
-        todo!()
+        let res = self.hasher.finalize();
+        self.hash.copy_from_slice(&res);
+        HashReturn::SHA256(self.hash)
     }
 }
 
@@ -24,6 +31,17 @@ mod test {
 
     #[test]
     fn test_sha256_hash() {
-        todo!();
+        let input = "HelloWorld";
+        let expected_output = "872e4e50ce9990d8b041330c47c9ddd11bec6b503ae9386a99da8584e9bb12c4";
+
+        let mut sha256 = SHA256::new();
+
+        sha256.digest(input);
+
+        let result = sha256.complete().into_bytes();
+
+        let hash_out = crate::hex_table::u8_array_to_lower_hex_string(&result).unwrap();
+
+        assert_eq!(hash_out, expected_output);
     }
 }