mirror of
https://github.com/logos-messaging/noise.git
synced 2026-01-05 07:33:09 +00:00
Refactor to prepare for pipes implementation
This commit is contained in:
Jonathan Rudenberg
parent
39d629fcc7
commit
e36eb5dddd
108
box/box.go
108
box/box.go
@ -21,6 +21,7 @@ type Ciphersuite interface {
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DHLen() int
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CCLen() int
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MACLen() int
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KeyLen() (int, int)
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GenerateKey(io.Reader) (Key, error)
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DH(privkey, pubkey []byte) []byte
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@ -33,7 +34,7 @@ type CipherContext interface {
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Decrypt(authtext, ciphertext []byte) ([]byte, error)
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}
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const cvLen = 48
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const CVLen = 48
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type Key struct {
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Public []byte
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@ -41,34 +42,34 @@ type Key struct {
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}
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type Crypter struct {
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Cipher Ciphersuite
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SenderKey Key
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ReceiverKey Key
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ChainVar []byte
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KDFNum int
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Cipher Ciphersuite
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Key Key
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PeerKey Key
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ChainVar []byte
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KDFNum int
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scratch [192]byte
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scratch [64]byte
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cc CipherContext
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}
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func (c *Crypter) noiseBody(cc CipherContext, dst []byte, padLen int, appData, header []byte) []byte {
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var plaintext []byte
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if plainLen := len(appData) + padLen + 4; len(c.scratch) >= plainLen {
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plaintext = c.scratch[:plainLen]
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func (c *Crypter) EncryptBody(dst, plaintext, authtext []byte, padLen int) []byte {
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var p []byte
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if plainLen := len(plaintext) + padLen + 4; len(c.scratch) >= plainLen {
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p = c.scratch[:plainLen]
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} else {
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plaintext = make([]byte, plainLen)
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p = make([]byte, plainLen)
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}
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copy(plaintext, appData)
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if _, err := io.ReadFull(rand.Reader, plaintext[len(appData):len(appData)+padLen]); err != nil {
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copy(p, plaintext)
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if _, err := io.ReadFull(rand.Reader, p[len(plaintext):len(plaintext)+padLen]); err != nil {
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panic(err)
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}
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binary.BigEndian.PutUint32(plaintext[len(appData)+padLen:], uint32(padLen))
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return cc.Encrypt(dst, header, plaintext)
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binary.BigEndian.PutUint32(p[len(plaintext)+padLen:], uint32(padLen))
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return c.cc.Encrypt(dst, authtext, p)
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}
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func (c *Crypter) Encrypt(dst []byte, ephKey *Key, plaintext []byte, padLen int) ([]byte, error) {
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func (c *Crypter) EncryptBox(dst []byte, ephKey *Key, plaintext []byte, padLen int) ([]byte, error) {
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if len(c.ChainVar) == 0 {
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c.ChainVar = make([]byte, cvLen)
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c.ChainVar = make([]byte, CVLen)
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}
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if ephKey == nil {
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k, err := c.Cipher.GenerateKey(rand.Reader)
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@ -85,22 +86,27 @@ func (c *Crypter) Encrypt(dst []byte, ephKey *Key, plaintext []byte, padLen int)
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dst = newDst
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}
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dh1 := c.Cipher.DH(ephKey.Private, c.ReceiverKey.Public)
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dh2 := c.Cipher.DH(c.SenderKey.Private, c.ReceiverKey.Public)
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dh1 := c.Cipher.DH(ephKey.Private, c.PeerKey.Public)
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dh2 := c.Cipher.DH(c.Key.Private, c.PeerKey.Public)
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cv1, cc1 := c.deriveKey(dh1, c.ChainVar)
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cv2, cc2 := c.deriveKey(dh2, cv1)
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c.ChainVar = cv2
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dst = append(dst, ephKey.Public...)
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dst = c.cipher(cc1).Encrypt(dst, ephKey.Public, c.SenderKey.Public)
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return c.noiseBody(c.cipher(cc2), dst, padLen, plaintext, dst[dstPrefixLen:]), nil
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dst = c.cipher(cc1).Encrypt(dst, ephKey.Public, c.Key.Public)
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c.cc.Reset(cc2)
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return c.EncryptBody(dst, plaintext, dst[dstPrefixLen:], padLen), nil
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}
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func (c *Crypter) EncryptedLen(n int) int {
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return n + (2 * c.Cipher.DHLen()) + (2 * c.Cipher.MACLen()) + 4
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}
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func (c *Crypter) SetContext(cc []byte) {
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c.cipher(cc)
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}
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func (c *Crypter) cipher(cc []byte) CipherContext {
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if c.cc == nil {
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c.cc = c.Cipher.NewCipher(cc)
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@ -110,13 +116,13 @@ func (c *Crypter) cipher(cc []byte) CipherContext {
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return c.cc
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}
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func (c *Crypter) Decrypt(ciphertext []byte) ([]byte, error) {
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func (c *Crypter) DecryptBox(ciphertext []byte) ([]byte, error) {
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if len(c.ChainVar) == 0 {
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c.ChainVar = make([]byte, cvLen)
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c.ChainVar = make([]byte, CVLen)
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}
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ephPubKey := ciphertext[:c.Cipher.DHLen()]
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dh1 := c.Cipher.DH(c.ReceiverKey.Private, ephPubKey)
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dh1 := c.Cipher.DH(c.Key.Private, ephPubKey)
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cv1, cc1 := c.deriveKey(dh1, c.ChainVar)
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header := ciphertext[:(2*c.Cipher.DHLen())+c.Cipher.MACLen()]
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@ -125,8 +131,13 @@ func (c *Crypter) Decrypt(ciphertext []byte) ([]byte, error) {
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if err != nil {
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return nil, err
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}
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if len(c.PeerKey.Public) > 0 {
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if len(c.PeerKey.Public) != len(senderPubKey) || subtle.ConstantTimeCompare(senderPubKey, c.PeerKey.Public) != 1 {
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return nil, errors.New("pipe: unexpected sender public key")
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}
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}
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dh2 := c.Cipher.DH(c.ReceiverKey.Private, senderPubKey)
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dh2 := c.Cipher.DH(c.Key.Private, senderPubKey)
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cv2, cc2 := c.deriveKey(dh2, cv1)
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c.ChainVar = cv2
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body, err := c.cipher(cc2).Decrypt(header, ciphertext)
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@ -138,33 +149,36 @@ func (c *Crypter) Decrypt(ciphertext []byte) ([]byte, error) {
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return body[:len(body)-(padLen+4)], nil
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}
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func (c *Crypter) deriveKey(dh, cv []byte) ([]byte, []byte) {
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// info || (byte)c || t[0:32] || extra_data
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data := append(append(c.scratch[:0:128], cv...), 0)
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data = data[:len(data)+32]
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data = c.Cipher.AppendName(data)
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data = strconv.AppendInt(data, int64(c.KDFNum), 10)
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t := c.scratch[cap(data):]
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k := deriveKey(dh, data, t, cvLen, cvLen+c.Cipher.CCLen())
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c.KDFNum++
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return k[:cvLen], k[cvLen:]
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func (c *Crypter) DecryptBody(authtext, ciphertext []byte) ([]byte, error) {
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if c.cc == nil {
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return nil, errors.New("box: uninitialized cipher context")
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}
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return c.cc.Decrypt(authtext, ciphertext)
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}
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func deriveKey(secret, data, t []byte, infoLen, outputLen int) []byte {
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output := make([]byte, 0, outputLen)
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func (c *Crypter) deriveKey(dh, cv []byte) ([]byte, []byte) {
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extra := strconv.AppendInt(c.Cipher.AppendName(c.scratch[:0]), int64(c.KDFNum), 10)
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k := DeriveKey(dh, extra, cv, CVLen+c.Cipher.CCLen())
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c.KDFNum++
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return k[:CVLen], k[CVLen:]
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}
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func DeriveKey(secret, extra, info []byte, outputLen int) []byte {
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buf := make([]byte, outputLen+sha512.Size)
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output := buf[:0:outputLen]
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t := buf[outputLen:]
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h := hmac.New(sha512.New, secret)
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var c byte
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for len(output) < outputLen {
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data[infoLen] = c
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copy(data[infoLen+1:], t[:32])
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h.Write(data)
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h.Write(info)
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h.Write([]byte{c})
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h.Write(t[:32])
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h.Write(extra)
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t = h.Sum(t[:0])
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h.Reset()
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c++
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if cap(output)-len(output) < len(t) {
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output = append(output, t[:cap(output)-len(output)]...)
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if outputLen-len(output) < len(t) {
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output = append(output, t[:outputLen-len(output)]...)
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} else {
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output = append(output, t...)
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}
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@ -195,6 +209,10 @@ func (noise255) GenerateKey(random io.Reader) (Key, error) {
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return Key{Private: privKey[:], Public: pubKey[:]}, nil
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}
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func (noise255) KeyLen() (int, int) {
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return 32, 32
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}
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func (noise255) DH(privkey, pubkey []byte) []byte {
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var dst, in, base [32]byte
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copy(in[:], privkey)
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@ -18,21 +18,21 @@ func (s *S) TestRoundtrip(c *C) {
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plain := []byte("yellow submarines")
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padLen := 2
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ciphertext, err := enc.Encrypt(nil, nil, plain, padLen)
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ciphertext, err := enc.EncryptBox(nil, nil, plain, padLen)
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c.Assert(err, IsNil)
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expectedLen := len(plain) + padLen + (2 * Noise255.DHLen()) + (2 * Noise255.MACLen()) + 4
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c.Assert(ciphertext, HasLen, expectedLen, Commentf("expected: %d", expectedLen))
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plaintext, err := dec.Decrypt(ciphertext)
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plaintext, err := dec.DecryptBox(ciphertext)
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c.Assert(err, IsNil)
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c.Assert(plaintext, DeepEquals, plain)
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plain[0] = 'Y'
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ciphertext, err = enc.Encrypt(nil, nil, plain, 0)
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ciphertext, err = enc.EncryptBox(nil, nil, plain, 0)
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c.Assert(err, IsNil)
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plaintext, err = dec.Decrypt(ciphertext)
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plaintext, err = dec.DecryptBox(ciphertext)
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c.Assert(err, IsNil)
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c.Assert(plaintext, DeepEquals, plain)
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}
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@ -42,27 +42,27 @@ func newCrypters() (*Crypter, *Crypter) {
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sendKey, _ := Noise255.GenerateKey(rand.Reader)
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enc := &Crypter{
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Cipher: Noise255,
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SenderKey: sendKey,
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ReceiverKey: recvKey,
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Cipher: Noise255,
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Key: sendKey,
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PeerKey: recvKey,
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}
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enc.ReceiverKey.Private = nil
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enc.PeerKey.Private = nil
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dec := &Crypter{
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Cipher: Noise255,
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SenderKey: sendKey,
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ReceiverKey: recvKey,
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Cipher: Noise255,
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Key: recvKey,
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PeerKey: sendKey,
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}
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dec.SenderKey.Private = nil
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dec.PeerKey.Private = nil
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return enc, dec
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}
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func BenchmarkEncrypt(b *testing.B) {
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func BenchmarkEncryptBox(b *testing.B) {
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enc, _ := newCrypters()
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b.ReportAllocs()
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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enc.Encrypt(nil, nil, []byte("yellow submarine"), 0)
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enc.EncryptBox(nil, nil, []byte("yellow submarine"), 0)
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}
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}
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