Init

1 files changed, 42 insertions, 0 deletions

diff --git a/src/hasher.rs b/src/hasher.rs
new file mode 100644
index 0000000..028e73a
--- /dev/null
+++ b/src/hasher.rs
@@ -0,0 +1,42 @@
+use sha2::{Digest, Sha256};
+
+pub trait Hasher {
+    fn hash(&self, input: &str) -> String;
+}
+
+pub struct DefaultHasher;
+
+impl Hasher for DefaultHasher {
+    fn hash(&self, input: &str) -> String {
+        let mut hasher = Sha256::new();
+        hasher.update(input.as_bytes());
+        hex::encode(hasher.finalize())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_default_hasher_with_known_input() {
+        let hasher = DefaultHasher;
+        let input = "hello";
+        let expected_hash = "2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824";
+
+        let actual_hash = hasher.hash(input);
+
+        assert_eq!(actual_hash, expected_hash);
+    }
+
+    #[test]
+    fn test_default_hasher_empty_string() {
+        let hasher = DefaultHasher;
+        let input = "";
+        let expected_hash = "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855";
+
+        let actual_hash = hasher.hash(input);
+
+        assert_eq!(actual_hash, expected_hash);
+    }
+}