func buildSharedBox(message []byte, peers []PublicKey, btype byte) []byte {
if message == nil {
return nil
}
for _, peer := range peers {
if peer == nil {
return nil
} else if !KeyIsSuitable(nil, peer) {
return nil
}
}
e_priv, e_pub, ok := GenerateKey()
if !ok {
return nil
}
shared, ok := strongbox.GenerateKey()
if !ok {
return nil
}
defer zero(shared)
packPeers := newbw([]byte{peerList})
packPeers.WriteUint32(uint32(len(peers)))
for _, peer := range peers {
packPeers.Write(peer)
pbox, ok := boxForPeer(e_priv, peer, shared)
if !ok {
return nil
}
packPeers.Write(pbox)
}
plist := packPeers.Bytes()
if plist == nil {
return nil
}
packer := newbw([]byte{btype})
packer.Write(e_pub)
packer.Write(plist)
sbox, ok := strongbox.Seal(message, shared)
if !ok {
return nil
}
packer.Write(sbox)
return packer.Bytes()
}
// Benchmark encryption of an 80-byte strongbox key.
func BenchmarkEncrypt(b *testing.B) {
b.StopTimer()
var ok bool
bmData, ok = strongbox.GenerateKey()
if !ok {
fmt.Println("tkdf: failed to generate strongbox secret key.")
b.FailNow()
}
b.StartTimer()
for i := 0; i < b.N; i++ {
bmBox = Encrypt(testKey, bmData)
if bmBox == nil {
fmt.Println("tkdf: failed to encrypt benchmark")
b.FailNow()
}
}
}