17 lines
553 B
Go
17 lines
553 B
Go
package random
|
|
|
|
import (
|
|
"encoding/binary"
|
|
|
|
"github.com/chihaya/chihaya/bittorrent"
|
|
)
|
|
|
|
// DeriveEntropyFromRequest generates 2*64 bits of pseudo random state from an
|
|
// AnnounceRequest.
|
|
//
|
|
// Calling DeriveEntropyFromRequest multiple times yields the same values.
|
|
func DeriveEntropyFromRequest(req *bittorrent.AnnounceRequest) (uint64, uint64) {
|
|
v0 := binary.BigEndian.Uint64(req.InfoHash[:8]) + binary.BigEndian.Uint64(req.InfoHash[8:16])
|
|
v1 := binary.BigEndian.Uint64(req.Peer.ID[:8]) + binary.BigEndian.Uint64(req.Peer.ID[8:16])
|
|
return v0, v1
|
|
}
|