fix: resolve trait implementation errors and fix hasher move in finalize

src/digest_engine/sha2.rs

@@ -1,7 +1,7 @@
 use std::io;
 use sha2::{Digest, Sha256};
 
-#[derive(Debug, Eq, PartialEq, Clone, Default)]
+#[derive(Debug, Clone, Default)]
 pub struct DigestEngineSha256 {
     hasher: Sha256,
 }
@@ -10,10 +10,28 @@ impl DigestEngineSha256 {
     pub fn new() -> DigestEngineSha256 {
         DigestEngineSha256 { hasher: Sha256::new() }
     }
+    
+    // Manual implementation of PartialEq
+    fn eq(&self, other: &Self) -> bool {
+        self.hasher.result().as_slice() == other.hasher.result().as_slice()
+    }
+    
+    // Manual implementation of Eq
+    fn is_eq(&self) -> bool {
+        true
+    }
 }
 
 use crate::digest_engine::DigestEngine;
 
+impl PartialEq for DigestEngineSha256 {
+    fn eq(&self, other: &Self) -> bool {
+        self.eq(other)
+    }
+}
+
+impl Eq for DigestEngineSha256 {}
+
 impl DigestEngine for DigestEngineSha256 {
     fn create(&self) -> Box<dyn DigestEngine> {
         Box::new(Self::new())
@@ -25,7 +43,7 @@ impl DigestEngine for DigestEngineSha256 {
     }
 
     fn finalize(&mut self) -> io::Result<String> {
-        let result = self.hasher.finalize();
+        let result = self.hasher.clone().finalize();
         Ok(format!("{:x}", result))
     }
 }