support char type

README.md

@@ -16,13 +16,24 @@
 use sha256::digest;
 
 fn main() {
+    let input = String::from("hello");
+    let val = digest(input);
+    assert_eq!(val,"2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824");
+
+    //sha256 digest &str
     let input = "hello";
     let val = digest(input);
-    assert_eq!(val, "2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824");
-
-    let input = "hello".to_string();
+    assert_eq!(val,"2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824");
+
+    //sha256 digest &mut &str
+    let mut input = "hello";
+    let val = digest(&mut input);
+    assert_eq!(val,"2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824");
+
+    //sha256 digest char
+    let mut input = "π";
     let val = digest(input);
-    assert_eq!(val, "2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824");
+    assert_eq!(val,"2617fcb92baa83a96341de050f07a3186657090881eae6b833f66a035600f35a");
 
 
     let input = b"hello";

src/lib.rs

@@ -14,6 +14,16 @@
 //! let val = digest(input);
 //! assert_eq!(val,"2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824");
 //!
+//! //sha256 digest &mut &str
+//! let mut input = "hello";
+//! let val = digest(&mut input);
+//! assert_eq!(val,"2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824");
+//!
+//! //sha256 digest char
+//! let mut input = "π";
+//! let val = digest(input);
+//! assert_eq!(val,"2617fcb92baa83a96341de050f07a3186657090881eae6b833f66a035600f35a");
+//!
 //! //sha256 digest bytes
 //! let input = b"hello";
 //! let val = digest(input);
@@ -156,6 +166,18 @@ impl Sha256Digest for &str {
     }
 }
 
+impl Sha256Digest for char {
+    fn digest(self) -> String {
+        __digest__(self.encode_utf8(&mut [0; 4]).as_bytes())
+    }
+}
+
+impl Sha256Digest for &mut &str {
+    fn digest(self) -> String {
+        __digest__(self.as_bytes())
+    }
+}
+
 impl Sha256Digest for &String {
     fn digest(self) -> String {
         __digest__(self.as_bytes())