add umbrella crate

auth/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "viendesu-auth"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+eva.workspace = true
+viendesu-core.workspace = true

auth/src/lib.rs

@@ -0,0 +1 @@
+pub mod passwords;

auth/src/passwords.rs

@@ -0,0 +1,24 @@
+use eva::auto_impl;
+
+use viendesu_core::types::user::PasswordHash;
+
+/// Passwords generation utility.
+#[auto_impl(&, &mut, Arc)]
+pub trait Passwords: Send + Sync {
+    fn verify(&self, hash: &str, cleartext: &str) -> bool;
+    fn make(&self, cleartext: &str) -> PasswordHash;
+}
+
+/// Plaintext passwords, no hashing.
+#[derive(Debug, Clone, Copy)]
+pub struct Plaintext;
+
+impl Passwords for Plaintext {
+    fn verify(&self, hash: &str, cleartext: &str) -> bool {
+        hash == cleartext
+    }
+
+    fn make(&self, cleartext: &str) -> PasswordHash {
+        cleartext.parse().unwrap()
+    }
+}