func BenchmarkSipHash(b *testing.B) {
h := siphash.New([]byte("0123456789012345"))
b.StartTimer()
for i := 0; i < b.N; i++ {
h.Write([]byte("Hello world"))
h.Sum(nil)
h.Reset()
}
}
// makeDuid constructs a new DUID. Adapted from systemd's implemenation here: https://github.com/systemd/systemd/blob/master/src/libsystemd-network/dhcp-identifier.c
func makeDuid() (Duid, error) {
id, err := getMachineID()
if err != nil {
return Duid{}, err
}
h := siphash.New(key)
h.Write(id)
return Duid{Type: DuidEn, PEN: VMwarePEN, ID: h.Sum64()}, nil
}
// makeIaid constructs a new IAID. Ported from systemd's
// implementation here: https://github.com/systemd/systemd/blob/master/src/libsystemd-network/dhcp-identifier.c
func makeIaid(ifindex int, hw net.HardwareAddr) Iaid {
h := siphash.New(key)
h.Write(hw)
id := h.Sum64()
// fold into 32 bits
iaid := make(Iaid, 4)
binary.BigEndian.PutUint32(iaid, uint32(id&0xffffffff)^uint32(id>>32))
return iaid
}
func New7x7Size(sqSize, maxX, maxY, borderX, borderY int, key []byte) Renderer {
return &identicon{
sqSize: sqSize,
maxX: maxX,
maxY: maxY,
borderX: borderX,
borderY: borderY,
rows: 7,
cols: 7,
h: siphash.New(key),
}
}
// New7x7 creates a new 7-by-7 identicon renderer using 'key' as the hash salt
func New7x7(key []byte) Renderer {
return &identicon{
sqSize: 50,
maxX: maxX,
maxY: maxY,
borderX: xborder,
borderY: yborder,
rows: 7,
cols: 7,
h: siphash.New(key),
}
}
// NewHashDrbg makes a HashDrbg instance based off an optional seed. The seed
// is truncated to SeedLength.
func NewHashDrbg(seed *Seed) (*HashDrbg, error) {
drbg := new(HashDrbg)
if seed == nil {
var err error
if seed, err = NewSeed(); err != nil {
return nil, err
}
}
drbg.sip = siphash.New(seed.Bytes()[:16])
copy(drbg.ofb[:], seed.Bytes()[16:])
return drbg, nil
}