init: v1.0.0

grand/drng/entropy/entropy_source.go

@@ -0,0 +1,27 @@
+package entropy
+
+import (
+	"crypto/rand"
+	"sync"
+)
+
+type OSEntropySource struct {
+	mu sync.Mutex
+}
+
+func (e *OSEntropySource) GetEntropy(minEntropy int64, minEntropyInputLength int64, maxEntropyInputLength int64) ([]byte, error) {
+	//使用互斥锁保证熵源的独占性
+	e.mu.Lock()
+	defer e.mu.Unlock()
+
+	n := minEntropy
+	if n < minEntropyInputLength {
+		n = minEntropyInputLength
+	}
+	entropy := make([]byte, n)
+	if _, err := rand.Reader.Read(entropy); err != nil {
+		return nil, err
+	}
+
+	return entropy, nil
+}