From 136b54fbcc0d6d08633653946e7724a2fa0b07d3 Mon Sep 17 00:00:00 2001
From: "Richard T. Carback III" <rick.carback@gmail.com>
Date: Wed, 27 Apr 2022 16:29:44 +0000
Subject: [PATCH] move more precan stuff into precan.go
---
api/precan.go | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 64 insertions(+)
diff --git a/api/precan.go b/api/precan.go
index ac90ba42c..8b084f912 100644
--- a/api/precan.go
+++ b/api/precan.go
@@ -11,11 +11,15 @@ import (
"encoding/binary"
"math/rand"
+ "github.com/cloudflare/circl/dh/sidh"
jww "github.com/spf13/jwalterweatherman"
+ "gitlab.com/elixxir/client/e2e/ratchet/partner/session"
"gitlab.com/elixxir/client/storage"
"gitlab.com/elixxir/client/storage/user"
+ "gitlab.com/elixxir/crypto/contact"
"gitlab.com/elixxir/crypto/cyclic"
"gitlab.com/elixxir/crypto/fastRNG"
+ "gitlab.com/elixxir/primitives/fact"
"gitlab.com/xx_network/crypto/csprng"
"gitlab.com/xx_network/crypto/signature/rsa"
"gitlab.com/xx_network/primitives/id"
@@ -94,3 +98,63 @@ func NewPrecannedClient(precannedID uint, defJSON, storageDir string,
return nil
}
+
+// Create an insecure e2e relationship with a precanned user
+func (c *Client) MakePrecannedAuthenticatedChannel(precannedID uint) (
+ contact.Contact, error) {
+
+ precan := c.MakePrecannedContact(precannedID)
+
+ myID := binary.BigEndian.Uint64(c.GetUser().GetContact().ID[:])
+ // Pick a variant based on if their ID is bigger than mine.
+ myVariant := sidh.KeyVariantSidhA
+ theirVariant := sidh.KeyVariant(sidh.KeyVariantSidhB)
+ if myID > uint64(precannedID) {
+ myVariant = sidh.KeyVariantSidhB
+ theirVariant = sidh.KeyVariantSidhA
+ }
+ prng1 := rand.New(rand.NewSource(int64(precannedID)))
+ theirSIDHPrivKey := util.NewSIDHPrivateKey(theirVariant)
+ theirSIDHPubKey := util.NewSIDHPublicKey(theirVariant)
+ theirSIDHPrivKey.Generate(prng1)
+ theirSIDHPrivKey.GeneratePublicKey(theirSIDHPubKey)
+
+ prng2 := rand.New(rand.NewSource(int64(myID)))
+ mySIDHPrivKey := util.NewSIDHPrivateKey(myVariant)
+ mySIDHPubKey := util.NewSIDHPublicKey(myVariant)
+ mySIDHPrivKey.Generate(prng2)
+ mySIDHPrivKey.GeneratePublicKey(mySIDHPubKey)
+
+ // add the precanned user as a e2e contact
+ // FIXME: these params need to be threaded through...
+ sesParam := session.GetDefaultParams()
+ _, err := c.e2e.AddPartner(precan.ID, precan.DhPubKey,
+ c.e2e.GetHistoricalDHPrivkey(), theirSIDHPubKey,
+ mySIDHPrivKey, sesParam, sesParam)
+
+ // check garbled messages in case any messages arrived before creating
+ // the channel
+ c.network.CheckInProgressMessages()
+
+ return precan, err
+}
+
+// Create an insecure e2e contact object for a precanned user
+func (c *Client) MakePrecannedContact(precannedID uint) contact.Contact {
+
+ e2eGrp := c.storage.GetE2EGroup()
+
+ precanned := createPrecannedUser(precannedID, c.rng.GetStream(),
+ c.storage.GetCmixGroup(), e2eGrp)
+
+ // compute their public e2e key
+ partnerPubKey := e2eGrp.ExpG(precanned.E2eDhPrivateKey,
+ e2eGrp.NewInt(1))
+
+ return contact.Contact{
+ ID: precanned.ReceptionID,
+ DhPubKey: partnerPubKey,
+ OwnershipProof: nil,
+ Facts: make([]fact.Fact, 0),
+ }
+}
--
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