feat: awg 2.0 (#91)

* feat: ranged H1-H4
* feat: S3, S4 support
* chore: updated awg-tools version

---------

Co-authored-by: Yaroslav Gurov <ygurov@proton.me>

device/awg/prng.go

@@ -0,0 +1,50 @@
+package awg
+
+import (
+	crand "crypto/rand"
+	v2 "math/rand/v2"
+
+	"golang.org/x/exp/constraints"
+)
+
+type RandomNumberGenerator[T constraints.Integer] interface {
+	RandomSizeInRange(min, max T) T
+	Get() uint64
+	ReadSize(size int) []byte
+}
+
+type PRNG[T constraints.Integer] struct {
+	cha8Rand *v2.ChaCha8
+}
+
+func NewPRNG[T constraints.Integer]() PRNG[T] {
+	buf := make([]byte, 32)
+	_, _ = crand.Read(buf)
+
+	return PRNG[T]{
+		cha8Rand: v2.NewChaCha8([32]byte(buf)),
+	}
+}
+
+func (p PRNG[T]) RandomSizeInRange(min, max T) T {
+	if min > max {
+		panic("min must be less than max")
+	}
+
+	if min == max {
+		return min
+	}
+
+	return T(p.Get()%uint64(max-min)) + min
+}
+
+func (p PRNG[T]) Get() uint64 {
+	return p.cha8Rand.Uint64()
+}
+
+func (p PRNG[T]) ReadSize(size int) []byte {
+	// TODO: use a memory pool to allocate
+	buf := make([]byte, size)
+	_, _ = p.cha8Rand.Read(buf)
+	return buf
+}