Adding hashing module

src/hashing/mod.rs

@@ -0,0 +1,101 @@
+use argon2::{
+    Argon2, // The Argon2 algorithm struct
+    PasswordVerifier,
+    password_hash::{
+        PasswordHasher,
+        SaltString,
+        rand_core::OsRng, // Secure random number generator
+    },
+};
+
+pub fn generate_salt() -> Result<SaltString, argon2::Error> {
+    // Generate a random salt
+    // SaltString::generate uses OsRng internally for cryptographic security
+    Ok(SaltString::generate(&mut OsRng))
+}
+
+pub fn get_salt(s: &str) -> Result<SaltString, argon2::password_hash::Error> {
+    SaltString::from_b64(s)
+}
+
+pub fn hash_password(
+    password: &String,
+    salt: &SaltString,
+) -> Result<String, argon2::password_hash::Error> {
+    let password_bytes = password.as_bytes();
+
+    // Create an Argon2 instance with default parameters (recommended)
+    // You could customize parameters here if needed, but defaults are strong
+    let argon2 = Argon2::default();
+
+    // Hash the password with the salt
+    // The output is a PasswordHash string format that includes algorithm, version,
+    // parameters, salt, and the hash itself.
+    Ok(argon2.hash_password(password_bytes, salt)?.to_string())
+}
+
+pub fn verify_password(
+    password_attempt: &String,
+    stored_hash: String,
+) -> Result<bool, argon2::password_hash::Error> {
+    let password_bytes = password_attempt.as_bytes();
+
+    // Parse the stored hash string
+    // This extracts the salt, parameters, and hash digest
+    let parsed_hash = argon2::PasswordHash::new(stored_hash.as_str())?;
+
+    // Create an Argon2 instance (it will use the parameters from the parsed hash)
+    // Verify the password against the parsed hash
+    // This automatically uses the correct salt and parameters embedded in `parsed_hash`
+    match Argon2::default().verify_password(password_bytes, &parsed_hash) {
+        Ok(()) => Ok(true),                                       // Passwords match
+        Err(argon2::password_hash::Error::Password) => Ok(false), // Passwords don't match
+        Err(e) => Err(e), // Some other error occurred (e.g., invalid hash format)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_hash_password() {
+        let some_password = String::from("somethingrandom");
+        match hash_password(&some_password, &generate_salt().unwrap()) {
+            Ok(p) => match verify_password(&some_password, p.clone()) {
+                Ok(res) => {
+                    assert_eq!(res, true);
+                }
+                Err(err) => {
+                    assert!(false, "Error: {:?}", err.to_string());
+                }
+            },
+            Err(eerr) => {
+                assert!(false, "Error: {:?}", eerr.to_string());
+            }
+        }
+    }
+
+    #[test]
+    fn test_wrong_password() {
+        let some_password = String::from("somethingrandom");
+        match hash_password(&some_password, &generate_salt().unwrap()) {
+            Ok(p) => {
+                match verify_password(&some_password, p.clone()) {
+                    Ok(res) => {
+                        assert_eq!(res, true, "Passwords are not verified");
+                    }
+                    Err(err) => {
+                        assert!(false, "Error: {:?}", err.to_string());
+                    }
+                }
+                let wrong_password = String::from("Differentanotherlevel");
+                let result = verify_password(&wrong_password, p.clone()).unwrap();
+                assert_eq!(false, result, "Passwords should not match");
+            }
+            Err(err) => {
+                assert!(false, "Error: {:?}", err.to_string());
+            }
+        }
+    }
+}

src/main.rs

@@ -1,5 +1,6 @@
 pub mod config;
 pub mod db;
+pub mod hashing;
 
 
 #[tokio::main]