agent: quantum-resistant double ratchet encryption (#939)

* doc

* diff

* ratchet header

* types

* ratchet step with PQ KEM, message header with KEM

* comment

* update types, remove Eq instances, store KEM keys to database

* pqx3dh

* PQ double ratchet test

* pqdr tests pass

* fix most tests

* refactor

* allow KEM proposals from both sides

* test names

* agent API parameters to use PQ KEM

* initialize ratchet state for enabling KEM

* fix/test KEM state machine to support disabling/enabling via messages

* more tests

* diff

* diff2

* refactor

* refactor

* refactor

* refactor

* remove Maybe

* rename

* add PQ encryption status to CON, MID and MSG events and sendMessage API results

* different PQ parameter when creating connection

* rename/reorganize types for PQ encryption modes

* rename

* fix testWaitDeliveryTimeout

* rename

* rename2

* ghc8107

* rename

* increase timeouts for concurrent send/receive test

* enable all tests

---------

Co-authored-by: spaced4ndy <8711996+spaced4ndy@users.noreply.github.com>

src/Simplex/Messaging/Crypto.hs

@@ -101,6 +101,7 @@ module Simplex.Messaging.Crypto
     verify,
     verify',
     validSignatureSize,
+    checkAlgorithm,
 
     -- * crypto_box authenticator, as discussed in https://groups.google.com/g/sci.crypt/c/73yb5a9pz2Y/m/LNgRO7IYXOwJ
     CbAuthenticator (..),
@@ -243,8 +244,6 @@ data SAlgorithm :: Algorithm -> Type where
   SX25519 :: SAlgorithm X25519
   SX448 :: SAlgorithm X448
 
-deriving instance Eq (SAlgorithm a)
-
 deriving instance Show (SAlgorithm a)
 
 data Alg = forall a. AlgorithmI a => Alg (SAlgorithm a)
@@ -297,11 +296,6 @@ data APublicKey
     AlgorithmI a =>
     APublicKey (SAlgorithm a) (PublicKey a)
 
-instance Eq APublicKey where
-  APublicKey a k == APublicKey a' k' = case testEquality a a' of
-    Just Refl -> k == k'
-    Nothing -> False
-
 instance Encoding APublicKey where
   smpEncode = smpEncode . encodePubKey
   {-# INLINE smpEncode #-}
@@ -342,11 +336,6 @@ data APrivateKey
     AlgorithmI a =>
     APrivateKey (SAlgorithm a) (PrivateKey a)
 
-instance Eq APrivateKey where
-  APrivateKey a k == APrivateKey a' k' = case testEquality a a' of
-    Just Refl -> k == k'
-    Nothing -> False
-
 deriving instance Show APrivateKey
 
 type PrivateKeyEd25519 = PrivateKey Ed25519
@@ -372,11 +361,6 @@ data APrivateSignKey
     (AlgorithmI a, SignatureAlgorithm a) =>
     APrivateSignKey (SAlgorithm a) (PrivateKey a)
 
-instance Eq APrivateSignKey where
-  APrivateSignKey a k == APrivateSignKey a' k' = case testEquality a a' of
-    Just Refl -> k == k'
-    Nothing -> False
-
 deriving instance Show APrivateSignKey
 
 instance Encoding APrivateSignKey where
@@ -396,11 +380,6 @@ data APublicVerifyKey
     (AlgorithmI a, SignatureAlgorithm a) =>
     APublicVerifyKey (SAlgorithm a) (PublicKey a)
 
-instance Eq APublicVerifyKey where
-  APublicVerifyKey a k == APublicVerifyKey a' k' = case testEquality a a' of
-    Just Refl -> k == k'
-    Nothing -> False
-
 deriving instance Show APublicVerifyKey
 
 data APrivateDhKey
@@ -408,11 +387,6 @@ data APrivateDhKey
     (AlgorithmI a, DhAlgorithm a) =>
     APrivateDhKey (SAlgorithm a) (PrivateKey a)
 
-instance Eq APrivateDhKey where
-  APrivateDhKey a k == APrivateDhKey a' k' = case testEquality a a' of
-    Just Refl -> k == k'
-    Nothing -> False
-
 deriving instance Show APrivateDhKey
 
 data APublicDhKey
@@ -420,11 +394,6 @@ data APublicDhKey
     (AlgorithmI a, DhAlgorithm a) =>
     APublicDhKey (SAlgorithm a) (PublicKey a)
 
-instance Eq APublicDhKey where
-  APublicDhKey a k == APublicDhKey a' k' = case testEquality a a' of
-    Just Refl -> k == k'
-    Nothing -> False
-
 deriving instance Show APublicDhKey
 
 data DhSecret (a :: Algorithm) where
@@ -787,8 +756,6 @@ data Signature (a :: Algorithm) where
   SignatureEd25519 :: Ed25519.Signature -> Signature Ed25519
   SignatureEd448 :: Ed448.Signature -> Signature Ed448
 
-deriving instance Eq (Signature a)
-
 deriving instance Show (Signature a)
 
 data ASignature
@@ -796,11 +763,6 @@ data ASignature
     (AlgorithmI a, SignatureAlgorithm a) =>
     ASignature (SAlgorithm a) (Signature a)
 
-instance Eq ASignature where
-  ASignature a s == ASignature a' s' = case testEquality a a' of
-    Just Refl -> s == s'
-    _ -> False
-
 deriving instance Show ASignature
 
 class CryptoSignature s where
@@ -885,6 +847,8 @@ data CryptoError
     CryptoHeaderError String
   | -- | no sending chain key in ratchet state
     CERatchetState
+  | -- | no decapsulation key in ratchet state
+    CERatchetKEMState
   | -- | header decryption error (could indicate that another key should be tried)
     CERatchetHeader
   | -- | too many skipped messages