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105 lines
2.8 KiB
Go
105 lines
2.8 KiB
Go
// Copyright 2022 Cloudflare, Inc. All rights reserved. Use of this source code
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// is governed by a BSD-style license that can be found in the LICENSE file.
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//
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// Glue to add Circl's (post-quantum) hybrid KEMs.
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//
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// To enable set CurvePreferences with the desired scheme as the first element:
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//
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// import (
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// "github.com/cloudflare/circl/kem/tls"
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// "github.com/cloudflare/circl/kem/hybrid"
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//
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// [...]
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//
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// config.CurvePreferences = []tls.CurveID{
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// hybrid.X25519Kyber512Draft00().(tls.TLSScheme).TLSCurveID(),
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// tls.X25519,
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// tls.P256,
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// }
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package tls
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import (
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"fmt"
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"io"
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"github.com/cloudflare/circl/kem"
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"github.com/cloudflare/circl/kem/hybrid"
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)
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// Either ecdheParameters or kem.PrivateKey
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type clientKeySharePrivate interface{}
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var (
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X25519Kyber512Draft00 = CurveID(0xfe30)
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X25519Kyber768Draft00 = CurveID(0xfe31)
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invalidCurveID = CurveID(0)
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)
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func kemSchemeKeyToCurveID(s kem.Scheme) CurveID {
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switch s.Name() {
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case "Kyber512-X25519":
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return X25519Kyber512Draft00
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case "Kyber768-X25519":
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return X25519Kyber768Draft00
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default:
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return invalidCurveID
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}
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}
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// Extract CurveID from clientKeySharePrivate
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func clientKeySharePrivateCurveID(ks clientKeySharePrivate) CurveID {
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switch v := ks.(type) {
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case kem.PrivateKey:
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ret := kemSchemeKeyToCurveID(v.Scheme())
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if ret == invalidCurveID {
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panic("cfkem: internal error: don't know CurveID for this KEM")
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}
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return ret
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case ecdheParameters:
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return v.CurveID()
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default:
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panic("cfkem: internal error: unknown clientKeySharePrivate")
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}
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}
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// Returns scheme by CurveID if supported by Circl
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func curveIdToCirclScheme(id CurveID) kem.Scheme {
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switch id {
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case X25519Kyber512Draft00:
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return hybrid.Kyber512X25519()
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case X25519Kyber768Draft00:
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return hybrid.Kyber768X25519()
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}
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return nil
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}
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// Generate a new shared secret and encapsulates it for the packed
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// public key in ppk using randomness from rnd.
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func encapsulateForKem(scheme kem.Scheme, rnd io.Reader, ppk []byte) (
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ct, ss []byte, alert alert, err error,
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) {
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pk, err := scheme.UnmarshalBinaryPublicKey(ppk)
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if err != nil {
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return nil, nil, alertIllegalParameter, fmt.Errorf("unpack pk: %w", err)
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}
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seed := make([]byte, scheme.EncapsulationSeedSize())
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if _, err := io.ReadFull(rnd, seed); err != nil {
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return nil, nil, alertInternalError, fmt.Errorf("random: %w", err)
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}
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ct, ss, err = scheme.EncapsulateDeterministically(pk, seed)
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return ct, ss, alertIllegalParameter, err
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}
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// Generate a new keypair using randomness from rnd.
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func generateKemKeyPair(scheme kem.Scheme, rnd io.Reader) (
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kem.PublicKey, kem.PrivateKey, error,
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) {
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seed := make([]byte, scheme.SeedSize())
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if _, err := io.ReadFull(rnd, seed); err != nil {
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return nil, nil, err
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}
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pk, sk := scheme.DeriveKeyPair(seed)
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return pk, sk, nil
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}
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