Updated cryptography functions to be in-place

cryptography/Cargo.toml

@@ -24,3 +24,4 @@ bitflags = "2"
 arrayvec = "0.7"
 subtle = "2"
 once_cell = "1"
+serde = { version = "1", features = ["derive"] }

cryptography/src/account.rs

@@ -1,5 +1,5 @@
-use chacha20poly1305::{aead::Aead, AeadCore, ChaCha20Poly1305, KeyInit};
-use entity::account;
+use chacha20poly1305::{AeadCore, AeadInPlace, ChaCha20Poly1305, KeyInit};
+use entity::account::{self, ActiveModel};
 use pbkdf2::pbkdf2_hmac_array;
 use rand::{rngs::OsRng, RngCore};
 use sea_orm::ActiveValue::Set;
@@ -23,68 +23,89 @@ impl Cipher {
 
     /// Encrypts the value with the current cipher. The 12 byte nonce is appended to the result
     #[inline]
-    pub fn encrypt(&self, value: &[u8]) -> crate::Result<Vec<u8>> {
+    #[allow(clippy::missing_panics_doc)]
+    pub fn encrypt(&self, value: &mut Vec<u8>) {
         let nonce = ChaCha20Poly1305::generate_nonce(&mut OsRng);
-        let mut result = self.chacha.encrypt(&nonce, value)?;
-        result.extend(nonce);
-        Ok(result)
+        self.chacha.encrypt_in_place(&nonce, b"", value).unwrap();
+        value.extend_from_slice(&nonce);
     }
 
     /// Decrypts the value with the current cipher. The 12 byte nonce is expected to be at the end of the value
+    ///
+    /// # Errors
+    ///
+    /// Returns an error if the tag doesn't match the ciphertext
     #[inline]
-    pub fn decrypt(&self, value: &[u8]) -> crate::Result<Vec<u8>> {
-        let (data, nonce) = value.split_at(value.len() - 12);
+    pub fn decrypt(&self, value: &mut Vec<u8>) -> crate::Result<()> {
+        let nonce: [u8; 12] = value[value.len() - 12..]
+            .try_into()
+            .map_err(|_| crate::Error::InvalidInputLength)?;
+        value.truncate(value.len() - 12);
 
-        self.chacha.decrypt(nonce.into(), data).map_err(Into::into)
+        self.chacha
+            .decrypt_in_place(nonce.as_slice().into(), b"", value)
+            .map_err(Into::into)
     }
 }
 
-pub trait FromUnencryptedExt {
-    fn from_unencrypted(
-        user_id: u64,
-        name: String,
-        login: &str,
-        password: &str,
-        master_pass: &str,
-    ) -> crate::Result<account::ActiveModel>;
+#[derive(serde::Serialize, serde::Deserialize)]
+pub struct Decrypted {
+    pub name: String,
+    pub login: String,
+    pub password: String,
 }
 
-impl FromUnencryptedExt for account::ActiveModel {
-    /// Encryptes the provided data by the master password and creates the `ActiveModel` with all fields set to Set variant
+impl Decrypted {
+    /// Constructs `DecryptedAccount` by decrypting the provided account
+    ///
+    /// # Errors
+    ///
+    /// Returns an error if the tag doesn't match the ciphertext or if the decrypted data isn't valid UTF-8
     #[inline]
-    fn from_unencrypted(
-        user_id: u64,
-        name: String,
-        login: &str,
-        password: &str,
-        master_pass: &str,
-    ) -> crate::Result<Self> {
-        let mut salt = vec![0; 64];
-        OsRng.fill_bytes(&mut salt);
-        let cipher = Cipher::new(master_pass.as_bytes(), &salt);
-        let enc_login = Set(cipher.encrypt(login.as_bytes())?);
-        let enc_password = Set(cipher.encrypt(password.as_bytes())?);
+    pub fn from_account(mut account: account::Model, master_pass: &str) -> crate::Result<Self> {
+        let cipher = Cipher::new(master_pass.as_bytes(), &account.salt);
+        cipher.decrypt(&mut account.enc_login)?;
+        cipher.decrypt(&mut account.enc_password)?;
+
         Ok(Self {
-            name: Set(name),
-            user_id: Set(user_id),
-            salt: Set(salt),
-            enc_login,
-            enc_password,
+            name: account.name,
+            login: String::from_utf8(account.enc_login)?,
+            password: String::from_utf8(account.enc_password)?,
         })
     }
-}
 
-pub trait DecryptAccountExt {
-    fn decrypt(&self, master_pass: &str) -> crate::Result<(String, String)>;
-}
-
-impl DecryptAccountExt for account::Model {
-    /// Returns the decrypted login and password of the account
+    /// Constructs `ActiveModel` with eath field Set by encrypting `self`
     #[inline]
-    fn decrypt(&self, master_pass: &str) -> crate::Result<(String, String)> {
-        let cipher = Cipher::new(master_pass.as_bytes(), &self.salt);
-        let login = String::from_utf8(cipher.decrypt(&self.enc_login)?)?;
-        let password = String::from_utf8(cipher.decrypt(&self.enc_password)?)?;
-        Ok((login, password))
+    #[must_use]
+    pub fn into_account(self, user_id: u64, master_pass: &str) -> account::ActiveModel {
+        let mut login = self.login.into_bytes();
+        let mut password = self.password.into_bytes();
+        let mut salt = vec![0; 64];
+        OsRng.fill_bytes(&mut salt);
+
+        let cipher = Cipher::new(master_pass.as_bytes(), &salt);
+        cipher.encrypt(&mut login);
+        cipher.encrypt(&mut password);
+
+        ActiveModel {
+            user_id: Set(user_id),
+            name: Set(self.name),
+            salt: Set(salt),
+            enc_login: Set(login),
+            enc_password: Set(password),
+        }
+    }
+
+    /// Returns true if the account's fields are valid
+    #[inline]
+    #[must_use]
+    pub fn validate(&self) -> bool {
+        [
+            self.name.as_str(),
+            self.login.as_str(),
+            self.password.as_str(),
+        ]
+        .into_iter()
+        .all(super::validate_field)
     }
 }

cryptography/src/lib.rs

@@ -1,5 +1,4 @@
 //! Functions to encrypt the database models
-#![allow(clippy::missing_errors_doc)]
 
 pub mod account;
 pub mod hashing;
@@ -7,8 +6,23 @@ pub mod master_pass;
 pub mod passwords;
 pub mod prelude;
 
+/// Returns true if the field is valid
+#[inline]
+#[must_use]
+pub fn validate_field(field: &str) -> bool {
+    if !(1..255).contains(&field.len()) {
+        return false;
+    }
+    field
+        .chars()
+        .all(|char| !['`', '\\', '\n', '\t'].contains(&char))
+}
+
 #[derive(thiserror::Error, Debug)]
 pub enum Error {
+    #[error("Invalid input length")]
+    InvalidInputLength,
+
     #[error(transparent)]
     ChaChaError(#[from] chacha20poly1305::Error),
 

cryptography/src/prelude.rs

@@ -1,2 +1,3 @@
-pub use crate::account::{DecryptAccountExt as _, FromUnencryptedExt as _};
-pub use crate::master_pass::FromUnencryptedExt as _;
+pub use crate::{
+    account::Decrypted as DecryptedAccount, master_pass::FromUnencryptedExt as _, validate_field,
+};