package quic import ( "crypto/aes" "crypto/cipher" "crypto/sha256" "golang.org/x/crypto/chacha20poly1305" "github.com/xtls/xray-core/common" "github.com/xtls/xray-core/common/protocol" "github.com/xtls/xray-core/transport/internet" ) func getAuth(config *Config) (cipher.AEAD, error) { security := config.Security.GetSecurityType() if security == protocol.SecurityType_NONE { return nil, nil } salted := []byte(config.Key + "xray-quic-salt") key := sha256.Sum256(salted) if security == protocol.SecurityType_AES128_GCM { block, err := aes.NewCipher(key[:16]) common.Must(err) return cipher.NewGCM(block) } if security == protocol.SecurityType_CHACHA20_POLY1305 { return chacha20poly1305.New(key[:]) } return nil, newError("unsupported security type") } func getHeader(config *Config) (internet.PacketHeader, error) { if config.Header == nil { return nil, nil } msg, err := config.Header.GetInstance() if err != nil { return nil, err } return internet.CreatePacketHeader(msg) }