use go 1.12

Signed-off-by: hongming <talonwan@yunify.com>

vendor/github.com/lucas-clemente/quic-go/internal/crypto/aesgcm_aead.go

@@ -0,0 +1,74 @@
+package crypto
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"encoding/binary"
+	"errors"
+
+	"github.com/lucas-clemente/quic-go/internal/protocol"
+)
+
+type aeadAESGCM struct {
+	otherIV   []byte
+	myIV      []byte
+	encrypter cipher.AEAD
+	decrypter cipher.AEAD
+}
+
+var _ AEAD = &aeadAESGCM{}
+
+const ivLen = 12
+
+// NewAEADAESGCM creates a AEAD using AES-GCM
+func NewAEADAESGCM(otherKey []byte, myKey []byte, otherIV []byte, myIV []byte) (AEAD, error) {
+	// the IVs need to be at least 8 bytes long, otherwise we can't compute the nonce
+	if len(otherIV) != ivLen || len(myIV) != ivLen {
+		return nil, errors.New("AES-GCM: expected 12 byte IVs")
+	}
+
+	encrypterCipher, err := aes.NewCipher(myKey)
+	if err != nil {
+		return nil, err
+	}
+	encrypter, err := cipher.NewGCM(encrypterCipher)
+	if err != nil {
+		return nil, err
+	}
+	decrypterCipher, err := aes.NewCipher(otherKey)
+	if err != nil {
+		return nil, err
+	}
+	decrypter, err := cipher.NewGCM(decrypterCipher)
+	if err != nil {
+		return nil, err
+	}
+
+	return &aeadAESGCM{
+		otherIV:   otherIV,
+		myIV:      myIV,
+		encrypter: encrypter,
+		decrypter: decrypter,
+	}, nil
+}
+
+func (aead *aeadAESGCM) Open(dst, src []byte, packetNumber protocol.PacketNumber, associatedData []byte) ([]byte, error) {
+	return aead.decrypter.Open(dst, aead.makeNonce(aead.otherIV, packetNumber), src, associatedData)
+}
+
+func (aead *aeadAESGCM) Seal(dst, src []byte, packetNumber protocol.PacketNumber, associatedData []byte) []byte {
+	return aead.encrypter.Seal(dst, aead.makeNonce(aead.myIV, packetNumber), src, associatedData)
+}
+
+func (aead *aeadAESGCM) makeNonce(iv []byte, packetNumber protocol.PacketNumber) []byte {
+	nonce := make([]byte, ivLen)
+	binary.BigEndian.PutUint64(nonce[ivLen-8:], uint64(packetNumber))
+	for i := 0; i < ivLen; i++ {
+		nonce[i] ^= iv[i]
+	}
+	return nonce
+}
+
+func (aead *aeadAESGCM) Overhead() int {
+	return aead.encrypter.Overhead()
+}