New crypto refactoring.

.gitignore

@@ -76,3 +76,4 @@ local.properties
 /work/
 /rt/
 /docker/
+/scratch/

doc/crypto/gcrypt.txt

@@ -0,0 +1,3 @@
+
+https://wiki.gnupg.org/ECC
+https://gnupg.org/documentation/manuals/gcrypt.pdf (p.46)

src/cmd/vanityid/main.go

@@ -25,7 +25,7 @@ func main() {
 		if err != nil || n != 32 {
 			panic(err)
 		}
-		prv := crypto.EdDSAPrivateKeyFromSeed(seed)
+		prv := crypto.PrivateKeyFromSeed(seed)
 		pub := prv.Public().Bytes()
 		id := util.EncodeBinaryToString(pub)
 		for _, p := range prefixes {

src/gnunet/core/peer.go

@@ -19,18 +19,18 @@ type Peer interface {
 */
 
 type Peer struct {
-	pub      *crypto.EdDSAPublicKey
+	pub      *crypto.PublicKey
 	idString string
 	addrList []*util.Address
-	prv      *crypto.EdDSAPrivateKey  // long-term signing key
-	ephPrv   *crypto.EdDSAPrivateKey  // ephemeral signing key
+	prv      *crypto.PrivateKey       // long-term signing key
+	ephPrv   *crypto.PrivateKey       // ephemeral signing key
 	ephMsg   *message.EphemeralKeyMsg // ephemeral signing key message
 }
 
 func NewPeer(data []byte, local bool) (p *Peer, err error) {
 	p = new(Peer)
 	if local {
-		p.prv = crypto.EdDSAPrivateKeyFromSeed(data)
+		p.prv = crypto.PrivateKeyFromSeed(data)
 		p.pub = p.prv.Public()
 		p.ephPrv, p.ephMsg, err = message.NewEphemeralKey(p.pub.Bytes(), p.prv)
 		if err != nil {
@@ -38,7 +38,7 @@ func NewPeer(data []byte, local bool) (p *Peer, err error) {
 		}
 	} else {
 		p.prv = nil
-		p.pub = crypto.NewEdDSAPublicKey(data)
+		p.pub = crypto.NewPublicKey(data)
 	}
 	p.idString = util.EncodeBinaryToString(p.pub.Bytes())
 	p.addrList = make([]*util.Address, 0)
@@ -53,15 +53,15 @@ func (p *Peer) SetEphKeyMsg(msg *message.EphemeralKeyMsg) {
 	p.ephMsg = msg
 }
 
-func (p *Peer) EphPrvKey() *crypto.EdDSAPrivateKey {
+func (p *Peer) EphPrvKey() *crypto.PrivateKey {
 	return p.ephPrv
 }
 
-func (p *Peer) PrvKey() *crypto.EdDSAPrivateKey {
+func (p *Peer) PrvKey() *crypto.PrivateKey {
 	return p.prv
 }
 
-func (p *Peer) PubKey() *crypto.EdDSAPublicKey {
+func (p *Peer) PubKey() *crypto.PublicKey {
 	return p.pub
 }
 
@@ -81,13 +81,13 @@ func (p *Peer) AddAddress(a *util.Address) {
 	p.addrList = append(p.addrList, a)
 }
 
-func (p *Peer) Sign(msg []byte) ([]byte, error) {
+func (p *Peer) Sign(msg []byte) (*crypto.Signature, error) {
 	if p.prv == nil {
 		return nil, fmt.Errorf("No private key")
 	}
 	return p.prv.Sign(msg)
 }
 
-func (p *Peer) Verify(msg, sig []byte) bool {
+func (p *Peer) Verify(msg []byte, sig *crypto.Signature) bool {
 	return p.pub.Verify(msg, sig)
 }

src/gnunet/crypto/ecdhe.go

@@ -1,7 +0,0 @@
-package crypto
-
-import ()
-
-func SharedSecret(prv *EdDSAPrivateKey, pub *EdDSAPublicKey) ([]byte, error) {
-	return nil, nil
-}

src/gnunet/crypto/eddsa.go

@@ -1,99 +0,0 @@
-package crypto
-
-import (
-	"crypto"
-	"crypto/rand"
-	"crypto/sha512"
-	"errors"
-
-	"gnunet/util"
-
-	"gnunet/crypto/ed25519"
-)
-
-// Error codes
-var (
-	ErrInvalidEdDSAPrivateKeyData = errors.New("Invalid Ed25519 private key data")
-)
-
-//----------------------------------------------------------------------
-// Public key
-//----------------------------------------------------------------------
-
-// EdDSAPublicKey is a Ed25519 public key.
-type EdDSAPublicKey struct {
-	key ed25519.PublicKey
-}
-
-// NewEdDSAPublicKey sets the binary representation of a public key.
-// The value is not checked for validity!
-func NewEdDSAPublicKey(data []byte) *EdDSAPublicKey {
-	return &EdDSAPublicKey{
-		key: util.Clone(data),
-	}
-}
-
-// Bytes returns the binary representation of a public key.
-func (pub *EdDSAPublicKey) Bytes() []byte {
-	return []byte(pub.key)
-}
-
-// Verify checks a signature of a data block.
-func (pub *EdDSAPublicKey) Verify(data, sig []byte) bool {
-	h := sha512.New()
-	h.Write(data)
-	hv := h.Sum(nil)
-	return ed25519.Verify(pub.key, hv, sig)
-}
-
-//----------------------------------------------------------------------
-// Private Key
-//----------------------------------------------------------------------
-
-// EdDSAPrivateKey is a Ed25519 private key.
-type EdDSAPrivateKey struct {
-	key ed25519.PrivateKey // private key data (seed||public_key)
-	d   []byte             // HACK! "real" private key
-}
-
-// EdDSAPrivateKeyFromSeed returns a private key for a given seed.
-func EdDSAPrivateKeyFromSeed(seed []byte) *EdDSAPrivateKey {
-	k := &EdDSAPrivateKey{
-		key: ed25519.NewKeyFromSeed(seed),
-	}
-	// HACK! Save the "real" private key 'd' for later use
-	md := sha512.Sum512(seed)
-	k.d = util.Reverse(md[:32])
-	k.d[0] = (k.d[0] & 0x3f) | 0x40
-	k.d[31] &= 0xf8
-	return k
-}
-
-// D returns the "real" private key (HACK!)
-func (prv *EdDSAPrivateKey) D() []byte {
-	return util.Clone(prv.d)
-}
-
-// Public returns the public key for a private key.
-func (prv *EdDSAPrivateKey) Public() *EdDSAPublicKey {
-	return &EdDSAPublicKey{
-		key: util.Clone(prv.key[ed25519.PublicKeySize:]),
-	}
-}
-
-// Sign creates a signature for a data block.
-func (prv *EdDSAPrivateKey) Sign(data []byte) ([]byte, error) {
-	h := sha512.New()
-	h.Write(data)
-	hv := h.Sum(nil)
-	return prv.key.Sign(rand.Reader, hv, crypto.Hash(0))
-}
-
-// NewPeerKeypair creates a new Ed25519 key pair.
-func EdDSAKeypair() (*EdDSAPublicKey, *EdDSAPrivateKey, error) {
-	pub, prv, err := ed25519.GenerateKey(rand.Reader)
-	if err != nil {
-		return nil, nil, err
-	}
-	return &EdDSAPublicKey{key: pub}, &EdDSAPrivateKey{key: prv}, nil
-}

src/gnunet/crypto/key_exchange.go

@@ -0,0 +1,7 @@
+package crypto
+
+import ()
+
+func SharedSecret(prv *PrivateKey, pub *PublicKey) ([]byte, error) {
+	return nil, nil
+}

src/gnunet/crypto/keys.go

@@ -0,0 +1,100 @@
+package crypto
+
+import (
+	"crypto"
+	"crypto/rand"
+	"crypto/sha512"
+	"fmt"
+	"math/big"
+
+	"gnunet/crypto/ed25519"
+	"gnunet/util"
+)
+
+// Error codes
+var (
+	ErrInvalidPrivateKeyData = fmt.Errorf("Invalid private key data")
+)
+
+//----------------------------------------------------------------------
+// Public key
+//----------------------------------------------------------------------
+
+// PublicKey is a Ed25519 public key.
+type PublicKey struct {
+	key ed25519.PublicKey
+}
+
+// NewPublicKey sets the binary representation of a public key.
+// The value is not checked for validity!
+func NewPublicKey(data []byte) *PublicKey {
+	if l := len(data); l != ed25519.PublicKeySize {
+		panic(fmt.Sprintf("NewPublicKey: invalid key size (%d)", l))
+	}
+	return &PublicKey{
+		key: util.Clone(data),
+	}
+}
+
+// Bytes returns the binary representation of a public key.
+func (pub *PublicKey) Bytes() []byte {
+	return []byte(pub.key)
+}
+
+// Verify checks a signature of a message.
+func (pub *PublicKey) Verify(msg []byte, sig *Signature) bool {
+	hv := sha512.Sum512(msg)
+	return ed25519.Verify(pub.key, hv[:], sig.Bytes())
+}
+
+//----------------------------------------------------------------------
+// Private Key
+//----------------------------------------------------------------------
+
+// PrivateKey is a Ed25519 private key.
+type PrivateKey struct {
+	key ed25519.PrivateKey // private key data (seed||public_key)
+	d   *big.Int           // HACK! "real" private key
+}
+
+// PrivateKeyFromSeed returns a private key for a given seed.
+func PrivateKeyFromSeed(seed []byte) *PrivateKey {
+	k := &PrivateKey{
+		key: ed25519.NewKeyFromSeed(seed),
+	}
+	// HACK! Save the "real" private key 'd' for later use
+	md := sha512.Sum512(seed)
+	d := util.Reverse(md[:32])
+	d[0] = (d[0] & 0x3f) | 0x40
+	d[31] &= 0xf8
+	k.d = new(big.Int).SetBytes(d)
+	return k
+}
+
+// D returns the "real" private key (HACK!)
+func (prv *PrivateKey) D() *big.Int {
+	return prv.d
+}
+
+// Public returns the public key for a private key.
+func (prv *PrivateKey) Public() *PublicKey {
+	return &PublicKey{
+		key: util.Clone(prv.key[ed25519.PublicKeySize:]),
+	}
+}
+
+// Sign creates a signature for a message.
+func (prv *PrivateKey) Sign(msg []byte) (*Signature, error) {
+	hv := sha512.Sum512(msg)
+	sig, err := prv.key.Sign(rand.Reader, hv[:], crypto.Hash(0))
+	return NewSignatureFromBytes(sig), err
+}
+
+// NewKeypair creates a new Ed25519 key pair.
+func NewKeypair() (*PublicKey, *PrivateKey, error) {
+	pub, prv, err := ed25519.GenerateKey(rand.Reader)
+	if err != nil {
+		return nil, nil, err
+	}
+	return &PublicKey{key: pub}, &PrivateKey{key: prv}, nil
+}

src/gnunet/crypto/signature.go

@@ -1,6 +1,8 @@
 package crypto
 
-import ()
+import (
+	"gnunet/util"
+)
 
 // Signature purpose constants
 const (
@@ -34,3 +36,22 @@ const (
 	SIG_GNUID_TICKET                    // GNUid Ticket.
 	SIG_CREDENTIAL                      // GNUnet credential.
 )
+
+//----------------------------------------------------------------------
+// Signature
+//----------------------------------------------------------------------
+
+type Signature struct {
+	// internal
+	data []byte
+}
+
+func NewSignatureFromBytes(data []byte) *Signature {
+	return &Signature{
+		data: util.Clone(data),
+	}
+}
+
+func (s *Signature) Bytes() []byte {
+	return s.data[:]
+}

src/gnunet/message/msg_core.go

@@ -27,20 +27,19 @@ type EphemeralKeyMsg struct {
 }
 
 func NewEphemeralKeyMsg() *EphemeralKeyMsg {
-	b := &EphKeyBlock{
-		SignSize:     88,
-		SigPurpose:   crypto.SIG_ECC_KEY,
-		CreateTime:   util.GetAbsoluteTimeNow(),
-		ExpireTime:   util.GetAbsoluteTimeOffset(12 * time.Hour),
-		EphemeralKey: make([]byte, 32),
-		PeerID:       make([]byte, 32),
-	}
 	return &EphemeralKeyMsg{
 		MsgSize:      160,
 		MsgType:      CORE_EPHEMERAL_KEY,
 		SenderStatus: 1,
 		Signature:    make([]byte, 64),
-		SignedBlock:  b,
+		SignedBlock: &EphKeyBlock{
+			SignSize:     88,
+			SigPurpose:   crypto.SIG_ECC_KEY,
+			CreateTime:   util.GetAbsoluteTimeNow(),
+			ExpireTime:   util.GetAbsoluteTimeOffset(12 * time.Hour),
+			EphemeralKey: make([]byte, 32),
+			PeerID:       make([]byte, 32),
+		},
 	}
 }
 
@@ -52,25 +51,25 @@ func (m *EphemeralKeyMsg) String() string {
 		m.SenderStatus)
 }
 
-func (m *EphemeralKeyMsg) Public() *crypto.EdDSAPublicKey {
-	return crypto.NewEdDSAPublicKey(m.SignedBlock.PeerID)
+func (m *EphemeralKeyMsg) Public() *crypto.PublicKey {
+	return crypto.NewPublicKey(m.SignedBlock.PeerID)
 }
 
-func (m *EphemeralKeyMsg) Verify(pub *crypto.EdDSAPublicKey) bool {
+func (m *EphemeralKeyMsg) Verify(pub *crypto.PublicKey) bool {
 	data, err := Marshal(m.SignedBlock)
 	if err != nil {
 		fmt.Printf("Verify: %s\n", err)
 		return false
 	}
-	return pub.Verify(data, m.Signature)
+	sig := crypto.NewSignatureFromBytes(m.Signature)
+	return pub.Verify(data, sig)
 }
 
-func NewEphemeralKey(peerId []byte, ltPrv *crypto.EdDSAPrivateKey) (*crypto.EdDSAPrivateKey, *EphemeralKeyMsg, error) {
+func NewEphemeralKey(peerId []byte, ltPrv *crypto.PrivateKey) (*crypto.PrivateKey, *EphemeralKeyMsg, error) {
 	msg := NewEphemeralKeyMsg()
 	copy(msg.SignedBlock.PeerID, peerId)
-	seed := make([]byte, 32)
-	util.RndArray(seed)
-	prv := crypto.EdDSAPrivateKeyFromSeed(seed)
+	seed := util.NewRndArray(32)
+	prv := crypto.PrivateKeyFromSeed(seed)
 	copy(msg.SignedBlock.EphemeralKey, prv.Public().Bytes())
 
 	data, err := Marshal(msg.SignedBlock)
@@ -81,7 +80,7 @@ func NewEphemeralKey(peerId []byte, ltPrv *crypto.EdDSAPrivateKey) (*crypto.EdDS
 	if err != nil {
 		return nil, nil, err
 	}
-	msg.Signature = sig
+	copy(msg.Signature, sig.Bytes())
 
 	return prv, msg, nil
 }

src/gnunet/message/msg_transport.go

@@ -105,7 +105,7 @@ func (m *TransportPongMsg) String() string {
 	return fmt.Sprintf("TransportPongMsg{<unkown>,%d}", m.Challenge)
 }
 
-func (m *TransportPongMsg) Sign(prv *crypto.EdDSAPrivateKey) error {
+func (m *TransportPongMsg) Sign(prv *crypto.PrivateKey) error {
 	data, err := Marshal(m.SignedBlock)
 	if err != nil {
 		fmt.Printf("Sign: %s\n", err)
@@ -116,17 +116,18 @@ func (m *TransportPongMsg) Sign(prv *crypto.EdDSAPrivateKey) error {
 		fmt.Printf("Sign: %s\n", err)
 		return err
 	}
-	m.Signature = sig
+	copy(m.Signature, sig.Bytes())
 	return nil
 }
 
-func (m *TransportPongMsg) Verify(pub *crypto.EdDSAPublicKey) bool {
+func (m *TransportPongMsg) Verify(pub *crypto.PublicKey) bool {
 	data, err := Marshal(m.SignedBlock)
 	if err != nil {
 		fmt.Printf("Verify: %s\n", err)
 		return false
 	}
-	return pub.Verify(data, m.Signature)
+	sig := crypto.NewSignatureFromBytes(m.Signature)
+	return pub.Verify(data, sig)
 }
 
 //----------------------------------------------------------------------

src/gnunet/util/rnd.go

@@ -10,6 +10,12 @@ func RndArray(b []byte) {
 	rand.Read(b)
 }
 
+func NewRndArray(size int) []byte {
+	b := make([]byte, size)
+	rand.Read(b)
+	return b
+}
+
 func RndUInt64() uint64 {
 	b := make([]byte, 8)
 	RndArray(b)