Jake Hillion
8e9310fb02
All checks were successful
continuous-integration/drone/push Build is passing
47 lines
790 B
Go
47 lines
790 B
Go
package proxy
|
|
|
|
import (
|
|
"encoding/binary"
|
|
"time"
|
|
)
|
|
|
|
type Packet interface {
|
|
Marshal() []byte
|
|
Contents() []byte
|
|
}
|
|
|
|
type SimplePacket []byte
|
|
|
|
// get the raw data of the IP packet
|
|
func (p SimplePacket) Marshal() []byte {
|
|
return p
|
|
}
|
|
|
|
func (p SimplePacket) Contents() []byte {
|
|
return p
|
|
}
|
|
|
|
func AppendMac(b []byte, g MacGenerator) []byte {
|
|
footer := make([]byte, 8)
|
|
unixTime := uint64(time.Now().Unix())
|
|
binary.LittleEndian.PutUint64(footer, unixTime)
|
|
|
|
b = append(b, footer...)
|
|
|
|
mac := g.Generate(b)
|
|
return append(b, mac...)
|
|
}
|
|
|
|
func StripMac(b []byte, v MacVerifier) ([]byte, error) {
|
|
data := b[:len(b)-v.CodeLength()]
|
|
sum := b[len(b)-v.CodeLength():]
|
|
|
|
if err := v.Verify(data, sum); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// TODO: Verify timestamp
|
|
|
|
return data[:len(data)-8], nil
|
|
}
|