use go 1.12

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

vendor/github.com/lucas-clemente/quic-go/internal/crypto/aesgcm12_aead.go

@@ -0,0 +1,72 @@
+package crypto
+
+import (
+	"crypto/cipher"
+	"encoding/binary"
+	"errors"
+
+	"github.com/lucas-clemente/aes12"
+
+	"github.com/lucas-clemente/quic-go/internal/protocol"
+)
+
+type aeadAESGCM12 struct {
+	otherIV   []byte
+	myIV      []byte
+	encrypter cipher.AEAD
+	decrypter cipher.AEAD
+}
+
+var _ AEAD = &aeadAESGCM12{}
+
+// NewAEADAESGCM12 creates a AEAD using AES-GCM with 12 bytes tag size
+//
+// AES-GCM support is a bit hacky, since the go stdlib does not support 12 byte
+// tag size, and couples the cipher and aes packages closely.
+// See https://github.com/lucas-clemente/aes12.
+func NewAEADAESGCM12(otherKey []byte, myKey []byte, otherIV []byte, myIV []byte) (AEAD, error) {
+	if len(myKey) != 16 || len(otherKey) != 16 || len(myIV) != 4 || len(otherIV) != 4 {
+		return nil, errors.New("AES-GCM: expected 16-byte keys and 4-byte IVs")
+	}
+	encrypterCipher, err := aes12.NewCipher(myKey)
+	if err != nil {
+		return nil, err
+	}
+	encrypter, err := aes12.NewGCM(encrypterCipher)
+	if err != nil {
+		return nil, err
+	}
+	decrypterCipher, err := aes12.NewCipher(otherKey)
+	if err != nil {
+		return nil, err
+	}
+	decrypter, err := aes12.NewGCM(decrypterCipher)
+	if err != nil {
+		return nil, err
+	}
+	return &aeadAESGCM12{
+		otherIV:   otherIV,
+		myIV:      myIV,
+		encrypter: encrypter,
+		decrypter: decrypter,
+	}, nil
+}
+
+func (aead *aeadAESGCM12) 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 *aeadAESGCM12) Seal(dst, src []byte, packetNumber protocol.PacketNumber, associatedData []byte) []byte {
+	return aead.encrypter.Seal(dst, aead.makeNonce(aead.myIV, packetNumber), src, associatedData)
+}
+
+func (aead *aeadAESGCM12) makeNonce(iv []byte, packetNumber protocol.PacketNumber) []byte {
+	res := make([]byte, 12)
+	copy(res[0:4], iv)
+	binary.LittleEndian.PutUint64(res[4:12], uint64(packetNumber))
+	return res
+}
+
+func (aead *aeadAESGCM12) Overhead() int {
+	return aead.encrypter.Overhead()
+}