Now scrypt params are created once

Cargo.lock

@@ -466,6 +466,7 @@ dependencies = [
  "bitflags 2.3.1",
  "chacha20poly1305",
  "entity",
+ "once_cell",
  "pbkdf2",
  "rand",
  "scrypt",

cryptography/Cargo.toml

@@ -17,3 +17,4 @@ sea-orm = "0.11.3"
 bitflags = "2.3.1"
 arrayvec = "0.7.2"
 subtle = "2.5.0"
+once_cell = "1.18.0"

cryptography/src/master_pass.rs

@@ -1,15 +1,17 @@
 use entity::master_pass;
+use once_cell::sync::Lazy;
 use rand::{rngs::OsRng, RngCore};
 use scrypt::{scrypt, Params};
 use sea_orm::ActiveValue::Set;
 use subtle::ConstantTimeEq;
 
+static PARAMS: Lazy<Params> = Lazy::new(|| Params::new(14, 8, 1, 64).unwrap());
+
 /// Hashes the password with Scrypt with the given salt
 #[inline]
 fn hash_password(password: &[u8], salt: &[u8]) -> [u8; 64] {
-    let params = Params::new(14, Params::RECOMMENDED_R, Params::RECOMMENDED_P, 64).unwrap();
     let mut password_hash = [0; 64];
-    scrypt(password, salt, &params, &mut password_hash).unwrap();
+    scrypt(password, salt, &PARAMS, &mut password_hash).unwrap();
     password_hash
 }