init: v1.0.0

grand/drng/healthy/healthy.go

@@ -0,0 +1,45 @@
+package drng
+
+import (
+	"bytes"
+	"math"
+
+	"xdx.jelly/xgcl/grand/drng/entropy"
+	"xdx.jelly/xgcl/grand/drng/internal"
+)
+
+const ALPHA = 9.5367431640625e-07 // = 2^(-20)
+
+func next(source entropy.EntropySource) []byte {
+	b, err := source.GetEntropy(internal.MinEntropyInputLength, internal.MinEntropyInputLength, internal.MaxEntropyInputLength)
+	if err != nil {
+		return nil
+	}
+	return b
+}
+
+// 连续健康测试
+func RepeatCounterHealthyTests(source entropy.EntropySource, n int, H int) bool {
+	C := 1 + int64(math.Ceil(-math.Log2(ALPHA)/float64(H)))
+	A := next(source)
+	if A == nil {
+		return false
+	}
+	B := int64(1)
+	for i := 0; i < n; i++ {
+		X := next(source)
+		if X == nil {
+			return false
+		}
+		if bytes.Equal(X, A) {
+			B++
+		}
+		if B >= C {
+			return false
+		} else {
+			A = X
+			B = 1
+		}
+	}
+	return true
+}