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package xwing
import (
"bytes"
cryptoRand "crypto/rand"
"crypto/subtle"
"github.com/cloudflare/circl/kem"
"github.com/cloudflare/circl/kem/mlkem/mlkem768"
)
// This file contains the boilerplate code to connect X-Wing to the
// generic KEM API.
// Returns the generic KEM interface for X-Wing PQ/T hybrid KEM.
func Scheme() kem.Scheme { return scheme{} }
type scheme struct{}
func (scheme) Name() string { return "X-Wing" }
func (scheme) PublicKeySize() int { return PublicKeySize }
func (scheme) PrivateKeySize() int { return PrivateKeySize }
func (scheme) SeedSize() int { return SeedSize }
func (scheme) EncapsulationSeedSize() int { return EncapsulationSeedSize }
func (scheme) SharedKeySize() int { return SharedKeySize }
func (scheme) CiphertextSize() int { return CiphertextSize }
func (*PrivateKey) Scheme() kem.Scheme { return scheme{} }
func (*PublicKey) Scheme() kem.Scheme { return scheme{} }
func (sch scheme) Encapsulate(pk kem.PublicKey) (ct, ss []byte, err error) {
var seed [EncapsulationSeedSize]byte
_, err = cryptoRand.Read(seed[:])
if err != nil {
return
}
return sch.EncapsulateDeterministically(pk, seed[:])
}
func (scheme) EncapsulateDeterministically(
pk kem.PublicKey, seed []byte,
) ([]byte, []byte, error) {
if len(seed) != EncapsulationSeedSize {
return nil, nil, kem.ErrSeedSize
}
pub, ok := pk.(*PublicKey)
if !ok {
return nil, nil, kem.ErrTypeMismatch
}
var (
ct [CiphertextSize]byte
ss [SharedKeySize]byte
)
pub.EncapsulateTo(ct[:], ss[:], seed)
return ct[:], ss[:], nil
}
func (scheme) UnmarshalBinaryPublicKey(buf []byte) (kem.PublicKey, error) {
var pk PublicKey
if len(buf) != PublicKeySize {
return nil, kem.ErrPubKeySize
}
if err := pk.Unpack(buf); err != nil {
return nil, err
}
return &pk, nil
}
func (scheme) UnmarshalBinaryPrivateKey(buf []byte) (kem.PrivateKey, error) {
var sk PrivateKey
if len(buf) != PrivateKeySize {
return nil, kem.ErrPrivKeySize
}
sk.Unpack(buf)
return &sk, nil
}
func (sk *PrivateKey) MarshalBinary() ([]byte, error) {
var ret [PrivateKeySize]byte
sk.Pack(ret[:])
return ret[:], nil
}
func (sk *PrivateKey) Equal(other kem.PrivateKey) bool {
oth, ok := other.(*PrivateKey)
if !ok {
return false
}
return sk.m.Equal(&oth.m) &&
subtle.ConstantTimeCompare(oth.x[:], sk.x[:]) == 1
}
func (sk *PrivateKey) Public() kem.PublicKey {
var pk PublicKey
pk.m = *(sk.m.Public().(*mlkem768.PublicKey))
pk.x = sk.xpk
return &pk
}
func (pk *PublicKey) Equal(other kem.PublicKey) bool {
oth, ok := other.(*PublicKey)
if !ok {
return false
}
return pk.m.Equal(&oth.m) && bytes.Equal(pk.x[:], oth.x[:])
}
func (pk *PublicKey) MarshalBinary() ([]byte, error) {
var ret [PublicKeySize]byte
pk.Pack(ret[:])
return ret[:], nil
}
func (scheme) DeriveKeyPair(seed []byte) (kem.PublicKey, kem.PrivateKey) {
sk, pk := DeriveKeyPair(seed)
return pk, sk
}
func (scheme) GenerateKeyPair() (kem.PublicKey, kem.PrivateKey, error) {
sk, pk, err := GenerateKeyPair(nil)
return pk, sk, err
}
func (scheme) Decapsulate(sk kem.PrivateKey, ct []byte) ([]byte, error) {
if len(ct) != CiphertextSize {
return nil, kem.ErrCiphertextSize
}
var ss [SharedKeySize]byte
priv, ok := sk.(*PrivateKey)
if !ok {
return nil, kem.ErrTypeMismatch
}
priv.DecapsulateTo(ss[:], ct[:])
return ss[:], nil
}
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