perf: reduce verification load (#75)

- assume valid keys in the db
- verify keys on import from headers + disk
- use references in keyring when possible

src/dc_aheader.rs

@@ -160,7 +160,13 @@ impl str::FromStr for Aheader {
             .remove("keydata")
             .and_then(|raw| Key::from_base64(&raw, KeyType::Public))
         {
-            Some(key) => key,
+            Some(key) => {
+                if key.verify() {
+                    key
+                } else {
+                    return Err(());
+                }
+            }
             None => {
                 return Err(());
             }

src/dc_e2ee.rs

@@ -121,11 +121,9 @@ pub unsafe fn dc_e2ee_encrypt(
                                 recipient_addr,
                             ) && (peerstate.prefer_encrypt == 1i32 || 0 != e2ee_guaranteed)
                             {
-                                if let Some(key_to_use) =
-                                    dc_apeerstate_peek_key(&peerstate, min_verified)
+                                if let Some(key) = dc_apeerstate_peek_key(&peerstate, min_verified)
                                 {
-                                    // TODO: avoid clone
-                                    keyring.add(key_to_use.clone());
+                                    keyring.add_owned(key.clone());
                                     peerstates.push(peerstate);
                                 }
                             } else {
@@ -143,8 +141,7 @@ pub unsafe fn dc_e2ee_encrypt(
                     }
                 }
                 let sign_key = if 0 != do_encrypt {
-                    // TODO: avoid clone
-                    keyring.add(public_key.clone());
+                    keyring.add_ref(&public_key);
                     let key =
                         Key::from_self_private(context, addr, &context.sql.clone().read().unwrap());
 
@@ -670,12 +667,11 @@ pub unsafe fn dc_e2ee_decrypt(
                 if 0 != peerstate.degrade_event {
                     dc_handle_degrade_event(context, &peerstate);
                 }
-                // TODO: avoid clone
                 if let Some(ref key) = peerstate.gossip_key {
-                    public_keyring_for_validate.add(key.clone());
+                    public_keyring_for_validate.add_ref(key);
                 }
                 if let Some(ref key) = peerstate.public_key {
-                    public_keyring_for_validate.add(key.clone());
+                    public_keyring_for_validate.add_ref(key);
                 }
                 (*helper).signatures = malloc(::std::mem::size_of::<dc_hash_t>()) as *mut dc_hash_t;
                 dc_hash_init((*helper).signatures, 3i32, 1i32);

src/dc_imex.rs

@@ -522,6 +522,7 @@ unsafe fn set_self_key(
             CStr::from_ptr(buf_base64).to_str().unwrap(),
             KeyType::Private,
         )
+        .and_then(|k| if k.verify() { Some(k) } else { None })
         .and_then(|k| k.split_key().map(|pub_key| (k, pub_key)))
         {
             stmt = dc_sqlite3_prepare(

src/dc_key.rs

@@ -97,14 +97,7 @@ impl Key {
         };
 
         match res {
-            Ok(key) => {
-                if key.verify() {
-                    Some(key)
-                } else {
-                    eprintln!("Invalid key: {:?}", key);
-                    None
-                }
-            }
+            Ok(key) => Some(key),
             Err(err) => {
                 eprintln!("Invalid key bytes: {:?}\n{}", err, hex::encode(bytes));
                 None

src/dc_keyring.rs

@@ -1,3 +1,5 @@
+use std::borrow::Cow;
+
 use crate::constants::*;
 use crate::dc_context::dc_context_t;
 use crate::dc_key::*;
@@ -5,16 +7,24 @@ use crate::dc_sqlite3::*;
 use crate::types::*;
 
 #[derive(Default, Clone, Debug)]
-pub struct Keyring {
-    keys: Vec<Key>,
+pub struct Keyring<'a> {
+    keys: Vec<Cow<'a, Key>>,
 }
 
-impl Keyring {
-    pub fn add(&mut self, key: Key) {
+impl<'a> Keyring<'a> {
+    pub fn add_owned(&mut self, key: Key) {
+        self.add(Cow::Owned(key))
+    }
+
+    pub fn add_ref(&mut self, key: &'a Key) {
+        self.add(Cow::Borrowed(key))
+    }
+
+    fn add(&mut self, key: Cow<'a, Key>) {
         self.keys.push(key);
     }
 
-    pub fn keys(&self) -> &[Key] {
+    pub fn keys(&self) -> &[Cow<'a, Key>] {
         &self.keys
     }
 
@@ -39,7 +49,7 @@ impl Keyring {
         unsafe { sqlite3_bind_text(stmt, 1, self_addr, -1, None) };
         while unsafe { sqlite3_step(stmt) == 100 } {
             if let Some(key) = Key::from_stmt(stmt, 0, KeyType::Private) {
-                self.add(key);
+                self.add_owned(key);
             }
         }
         unsafe { sqlite3_finalize(stmt) };

src/dc_pgp.rs

@@ -182,6 +182,9 @@ pub fn dc_pgp_create_keypair(addr: *const libc::c_char) -> Option<(Key, Key)> {
         .sign(&private_key, || "".into())
         .expect("failed to sign public key");
 
+    private_key.verify().expect("invalid private key generated");
+    public_key.verify().expect("invalid public key generated");
+
     Some((Key::Public(public_key), Key::Secret(private_key)))
 }
 
@@ -197,8 +200,11 @@ pub fn dc_pgp_pk_encrypt(
     let lit_msg = Message::new_literal_bytes("", bytes);
     let pkeys: Vec<&SignedPublicKey> = public_keys_for_encryption
         .keys()
-        .iter()
-        .filter_map(|key| key.try_into().ok())
+        .into_iter()
+        .filter_map(|key| {
+            let k: &Key = &key;
+            k.try_into().ok()
+        })
         .collect();
 
     let mut rng = thread_rng();
@@ -237,7 +243,10 @@ pub fn dc_pgp_pk_decrypt(
         let skeys: Vec<&SignedSecretKey> = private_keys_for_decryption
             .keys()
             .iter()
-            .filter_map(|key| key.try_into().ok())
+            .filter_map(|key| {
+                let k: &Key = &key;
+                k.try_into().ok()
+            })
             .collect();
 
         msg.decrypt(|| "".into(), || "".into(), &skeys[..])
@@ -252,7 +261,10 @@ pub fn dc_pgp_pk_decrypt(
                     let pkeys: Vec<&SignedPublicKey> = public_keys_for_validation
                         .keys()
                         .iter()
-                        .filter_map(|key| key.try_into().ok())
+                        .filter_map(|key| {
+                            let k: &Key = &key;
+                            k.try_into().ok()
+                        })
                         .collect();
 
                     for pkey in &pkeys {

tests/stress.rs

@@ -2239,8 +2239,8 @@ fn test_encryption_decryption() {
         let original_text: *const libc::c_char =
             b"This is a test\x00" as *const u8 as *const libc::c_char;
         let mut keyring = Keyring::default();
-        keyring.add(public_key.clone());
-        keyring.add(public_key2.clone());
+        keyring.add_owned(public_key.clone());
+        keyring.add_ref(&public_key2);
 
         let ctext = dc_pgp_pk_encrypt(
             original_text as *const libc::c_void,
@@ -2270,13 +2270,13 @@ fn test_encryption_decryption() {
         let ctext_unsigned = CString::new(ctext).unwrap();
 
         let mut keyring = Keyring::default();
-        keyring.add(private_key);
+        keyring.add_owned(private_key);
 
         let mut public_keyring = Keyring::default();
-        public_keyring.add(public_key.clone());
+        public_keyring.add_ref(&public_key);
 
         let mut public_keyring2 = Keyring::default();
-        public_keyring2.add(public_key2.clone());
+        public_keyring2.add_owned(public_key2.clone());
 
         let mut valid_signatures = dc_hash_t {
             keyClass: 0,
@@ -2338,7 +2338,7 @@ fn test_encryption_decryption() {
 
         dc_hash_clear(&mut valid_signatures);
 
-        public_keyring2.add(public_key.clone());
+        public_keyring2.add_ref(&public_key);
 
         let plain = dc_pgp_pk_decrypt(
             ctext_signed.as_ptr() as *const _,
@@ -2371,9 +2371,9 @@ fn test_encryption_decryption() {
         dc_hash_clear(&mut valid_signatures);
 
         let mut keyring = Keyring::default();
-        keyring.add(private_key2);
+        keyring.add_ref(&private_key2);
         let mut public_keyring = Keyring::default();
-        public_keyring.add(public_key);
+        public_keyring.add_ref(&public_key);
 
         let plain = dc_pgp_pk_decrypt(
             ctext_signed.as_ptr() as *const _,