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uTLS: X25519Kyber768Draft00 hybrid post-quantum key agreement by clou…
…dflare/go (#222) * crypto/tls: Add hybrid post-quantum key agreement (#13) * import: client-side KEM from cloudflare/go * import: server-side KEM from cloudflare/go * fix: modify test to get rid of CFEvents. Note: uTLS does not promise any server-side functionality, and this change is made to be able to conduct unit tests which requires both side to be able to handle KEM Curves. Co-authored-by: Christopher Wood <caw@heapingbits.net> Co-Authored-By: Bas Westerbaan <bas@westerbaan.name> ---- Based on: * crypto/tls: Add hybrid post-quantum key agreement Adds X25519Kyber512Draft00, X25519Kyber768Draft00, and P256Kyber768Draft00 hybrid post-quantum key agreements with temporary group identifiers. The hybrid post-quantum key exchanges uses plain X{25519,448} instead of HPKE, which we assume will be more likely to be adopted. The order is chosen to match CECPQ2. Not enabled by default. Adds CFEvents to detect `HelloRetryRequest`s and to signal which key agreement was used. Co-authored-by: Christopher Wood <caw@heapingbits.net> [bas, 1.20.1: also adds P256Kyber768Draft00] [pwu, 1.20.4: updated circl to v1.3.3, moved code to cfevent.go] * crypto: add support for CIRCL signature schemes * only partially port the commit from cloudflare/go. We would stick to the official x509 at the cost of incompatibility. Co-Authored-By: Bas Westerbaan <bas@westerbaan.name> Co-Authored-By: Christopher Patton <3453007+cjpatton@users.noreply.github.com> Co-Authored-By: Peter Wu <peter@lekensteyn.nl> * crypto/tls: add new X25519Kyber768Draft00 code point Ported from cloudflare/go to support the upcoming new post-quantum keyshare. ---- * Point tls.X25519Kyber768Draft00 to the new 0x6399 identifier while the old 0xfe31 identifier is available as tls.X25519Kyber768Draft00Old. * Make sure that the kem.PrivateKey can always be mapped to the CurveID that was linked to it. This is needed since we now have two ID aliasing to the same scheme, and clients need to be able to detect whether the key share presented by the server actually matches the key share that the client originally sent. * Update tests, add the new identifier and remove unnecessary code. Link: https://mailarchive.ietf.org/arch/msg/tls/HAWpNpgptl--UZNSYuvsjB-Pc2k/ Link: https://datatracker.ietf.org/doc/draft-tls-westerbaan-xyber768d00/02/ Co-Authored-By: Peter Wu <peter@lekensteyn.nl> Co-Authored-By: Bas Westerbaan <bas@westerbaan.name> --------- Co-authored-by: Bas Westerbaan <bas@westerbaan.name> Co-authored-by: Christopher Patton <3453007+cjpatton@users.noreply.github.com> Co-authored-by: Peter Wu <peter@lekensteyn.nl>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| // Copyright 2022 Cloudflare, Inc. All rights reserved. Use of this source code | ||
| // is governed by a BSD-style license that can be found in the LICENSE file. | ||
| // | ||
| // Glue to add Circl's (post-quantum) hybrid KEMs. | ||
| // | ||
| // To enable set CurvePreferences with the desired scheme as the first element: | ||
| // | ||
| // import ( | ||
| // "crypto/tls" | ||
| // | ||
| // [...] | ||
| // | ||
| // config.CurvePreferences = []tls.CurveID{ | ||
| // tls.X25519Kyber768Draft00, | ||
| // tls.X25519, | ||
| // tls.P256, | ||
| // } | ||
|
|
||
| package tls | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "io" | ||
|
|
||
| "crypto/ecdh" | ||
|
|
||
| "github.com/cloudflare/circl/kem" | ||
| "github.com/cloudflare/circl/kem/hybrid" | ||
| ) | ||
|
|
||
| // Either *ecdh.PrivateKey or *kemPrivateKey | ||
| type clientKeySharePrivate interface{} | ||
|
|
||
| type kemPrivateKey struct { | ||
| secretKey kem.PrivateKey | ||
| curveID CurveID | ||
| } | ||
|
|
||
| var ( | ||
| X25519Kyber512Draft00 = CurveID(0xfe30) | ||
| X25519Kyber768Draft00 = CurveID(0x6399) | ||
| X25519Kyber768Draft00Old = CurveID(0xfe31) | ||
| P256Kyber768Draft00 = CurveID(0xfe32) | ||
| invalidCurveID = CurveID(0) | ||
| ) | ||
|
|
||
| // Extract CurveID from clientKeySharePrivate | ||
| func clientKeySharePrivateCurveID(ks clientKeySharePrivate) CurveID { | ||
| switch v := ks.(type) { | ||
| case *kemPrivateKey: | ||
| return v.curveID | ||
| case *ecdh.PrivateKey: | ||
| ret, ok := curveIDForCurve(v.Curve()) | ||
| if !ok { | ||
| panic("cfkem: internal error: unknown curve") | ||
| } | ||
| return ret | ||
| default: | ||
| panic("cfkem: internal error: unknown clientKeySharePrivate") | ||
| } | ||
| } | ||
|
|
||
| // Returns scheme by CurveID if supported by Circl | ||
| func curveIdToCirclScheme(id CurveID) kem.Scheme { | ||
| switch id { | ||
| case X25519Kyber512Draft00: | ||
| return hybrid.Kyber512X25519() | ||
| case X25519Kyber768Draft00, X25519Kyber768Draft00Old: | ||
| return hybrid.Kyber768X25519() | ||
| case P256Kyber768Draft00: | ||
| return hybrid.P256Kyber768Draft00() | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| // Generate a new shared secret and encapsulates it for the packed | ||
| // public key in ppk using randomness from rnd. | ||
| func encapsulateForKem(scheme kem.Scheme, rnd io.Reader, ppk []byte) ( | ||
| ct, ss []byte, alert alert, err error) { | ||
| pk, err := scheme.UnmarshalBinaryPublicKey(ppk) | ||
| if err != nil { | ||
| return nil, nil, alertIllegalParameter, fmt.Errorf("unpack pk: %w", err) | ||
| } | ||
| seed := make([]byte, scheme.EncapsulationSeedSize()) | ||
| if _, err := io.ReadFull(rnd, seed); err != nil { | ||
| return nil, nil, alertInternalError, fmt.Errorf("random: %w", err) | ||
| } | ||
| ct, ss, err = scheme.EncapsulateDeterministically(pk, seed) | ||
| return ct, ss, alertIllegalParameter, err | ||
| } | ||
|
|
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| // Generate a new keypair using randomness from rnd. | ||
| func generateKemKeyPair(scheme kem.Scheme, curveID CurveID, rnd io.Reader) ( | ||
| kem.PublicKey, *kemPrivateKey, error) { | ||
| seed := make([]byte, scheme.SeedSize()) | ||
| if _, err := io.ReadFull(rnd, seed); err != nil { | ||
| return nil, nil, err | ||
| } | ||
| pk, sk := scheme.DeriveKeyPair(seed) | ||
| return pk, &kemPrivateKey{sk, curveID}, nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| // Copyright 2022 Cloudflare, Inc. All rights reserved. Use of this source code | ||
| // is governed by a BSD-style license that can be found in the LICENSE file. | ||
|
|
||
| package tls | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "testing" | ||
| ) | ||
|
|
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| func testHybridKEX(t *testing.T, curveID CurveID, clientPQ, serverPQ, | ||
| clientTLS12, serverTLS12 bool) { | ||
| // var clientSelectedKEX *CurveID | ||
| // var retry bool | ||
|
|
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| clientConfig := testConfig.Clone() | ||
| if clientPQ { | ||
| clientConfig.CurvePreferences = []CurveID{curveID, X25519} | ||
| } | ||
| // clientCFEventHandler := func(ev CFEvent) { | ||
| // switch e := ev.(type) { | ||
| // case CFEventTLSNegotiatedNamedKEX: | ||
| // clientSelectedKEX = &e.KEX | ||
| // case CFEventTLS13HRR: | ||
| // retry = true | ||
| // } | ||
| // } | ||
| if clientTLS12 { | ||
| clientConfig.MaxVersion = VersionTLS12 | ||
| } | ||
|
|
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| serverConfig := testConfig.Clone() | ||
| if serverPQ { | ||
| serverConfig.CurvePreferences = []CurveID{curveID, X25519} | ||
| } else { | ||
| serverConfig.CurvePreferences = []CurveID{X25519} | ||
| } | ||
| if serverTLS12 { | ||
| serverConfig.MaxVersion = VersionTLS12 | ||
| } | ||
|
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| c, s := localPipe(t) | ||
| done := make(chan error) | ||
| defer c.Close() | ||
|
|
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| go func() { | ||
| defer s.Close() | ||
| done <- Server(s, serverConfig).Handshake() | ||
| }() | ||
|
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| cli := Client(c, clientConfig) | ||
| // cCtx := context.WithValue(context.Background(), CFEventHandlerContextKey{}, clientCFEventHandler) | ||
| clientErr := cli.HandshakeContext(context.Background()) | ||
| serverErr := <-done | ||
| if clientErr != nil { | ||
| t.Errorf("client error: %s", clientErr) | ||
| } | ||
| if serverErr != nil { | ||
| t.Errorf("server error: %s", serverErr) | ||
| } | ||
|
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| // var expectedKEX CurveID | ||
| // var expectedRetry bool | ||
|
|
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| // if clientPQ && serverPQ && !clientTLS12 && !serverTLS12 { | ||
| // expectedKEX = curveID | ||
| // } else { | ||
| // expectedKEX = X25519 | ||
| // } | ||
| // if !clientTLS12 && clientPQ && !serverPQ { | ||
| // expectedRetry = true | ||
| // } | ||
|
|
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| // if expectedRetry != retry { | ||
| // t.Errorf("Expected retry=%v, got retry=%v", expectedRetry, retry) | ||
| // } | ||
|
|
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| // if clientSelectedKEX == nil { | ||
| // t.Error("No KEX happened?") | ||
| // } else if *clientSelectedKEX != expectedKEX { | ||
| // t.Errorf("failed to negotiate: expected %d, got %d", | ||
| // expectedKEX, *clientSelectedKEX) | ||
| // } | ||
| } | ||
|
|
||
| func TestHybridKEX(t *testing.T) { | ||
| run := func(curveID CurveID, clientPQ, serverPQ, clientTLS12, serverTLS12 bool) { | ||
| t.Run(fmt.Sprintf("%#04x serverPQ:%v clientPQ:%v serverTLS12:%v clientTLS12:%v", uint16(curveID), | ||
| serverPQ, clientPQ, serverTLS12, clientTLS12), func(t *testing.T) { | ||
| testHybridKEX(t, curveID, clientPQ, serverPQ, clientTLS12, serverTLS12) | ||
| }) | ||
| } | ||
| for _, curveID := range []CurveID{ | ||
| X25519Kyber512Draft00, | ||
| X25519Kyber768Draft00, | ||
| X25519Kyber768Draft00Old, | ||
| P256Kyber768Draft00, | ||
| } { | ||
| run(curveID, true, true, false, false) | ||
| run(curveID, true, false, false, false) | ||
| run(curveID, false, true, false, false) | ||
| run(curveID, true, true, true, false) | ||
| run(curveID, true, true, false, true) | ||
| run(curveID, true, true, true, true) | ||
| } | ||
| } |
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