more consistent filenames

crypto/null_aead.go

@@ -0,0 +1,53 @@
+package crypto
+
+import (
+	"bytes"
+	"encoding/binary"
+	"errors"
+	"io"
+	"io/ioutil"
+
+	"github.com/lucas-clemente/quic-go/protocol"
+	"github.com/lucas-clemente/quic-go/utils"
+)
+
+// NullAEAD handles not-yet encrypted packets
+type NullAEAD struct{}
+
+var _ AEAD = &NullAEAD{}
+
+// Open and verify the ciphertext
+func (*NullAEAD) Open(packetNumber protocol.PacketNumber, associatedData []byte, r io.Reader) (*bytes.Reader, error) {
+	ciphertext, err := ioutil.ReadAll(r)
+	if err != nil {
+		return nil, err
+	}
+	if len(ciphertext) < 12 {
+		return nil, errors.New("NullAEAD: ciphertext cannot be less than 12 bytes long")
+	}
+
+	hash := New128a()
+	hash.Write(associatedData)
+	hash.Write(ciphertext[12:])
+	testHigh, testLow := hash.Sum128()
+
+	low := binary.LittleEndian.Uint64(ciphertext)
+	high := binary.LittleEndian.Uint32(ciphertext[8:])
+
+	if uint32(testHigh&0xffffffff) != high || testLow != low {
+		return nil, errors.New("NullAEAD: failed to authenticate received data")
+	}
+	return bytes.NewReader(ciphertext[12:]), nil
+}
+
+// Seal writes hash and ciphertext to the buffer
+func (*NullAEAD) Seal(packetNumber protocol.PacketNumber, b *bytes.Buffer, associatedData []byte, plaintext []byte) {
+	hash := New128a()
+	hash.Write(associatedData)
+	hash.Write(plaintext)
+	high, low := hash.Sum128()
+
+	utils.WriteUint64(b, low)
+	utils.WriteUint32(b, uint32(high))
+	b.Write(plaintext)
+}