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-rw-r--r--ethutil/rand.go24
1 files changed, 24 insertions, 0 deletions
diff --git a/ethutil/rand.go b/ethutil/rand.go
new file mode 100644
index 000000000..91dafec7e
--- /dev/null
+++ b/ethutil/rand.go
@@ -0,0 +1,24 @@
+package ethutil
+
+import (
+ "crypto/rand"
+ "encoding/binary"
+ "io"
+)
+
+func randomUint64(r io.Reader) (uint64, error) {
+ b := make([]byte, 8)
+ n, err := r.Read(b)
+ if n != len(b) {
+ return 0, io.ErrShortBuffer
+ }
+ if err != nil {
+ return 0, err
+ }
+ return binary.BigEndian.Uint64(b), nil
+}
+
+// RandomUint64 returns a cryptographically random uint64 value.
+func RandomUint64() (uint64, error) {
+ return randomUint64(rand.Reader)
+}