From 5196ee992e496f41b95465840efcc9c96cb392af Mon Sep 17 00:00:00 2001
From: Didactic Drunk <1479616+didactic-drunk@users.noreply.github.com>
Date: Tue, 3 Sep 2019 01:10:31 -0700
Subject: [PATCH] Sodium::Cipher::Chalsa Add #random_bytes for use as a CSPRNG.

---
 src/sodium/cipher/chalsa.cr | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/sodium/cipher/chalsa.cr b/src/sodium/cipher/chalsa.cr
index 6f5754b..3b7f5fc 100644
--- a/src/sodium/cipher/chalsa.cr
+++ b/src/sodium/cipher/chalsa.cr
@@ -51,6 +51,21 @@ module Sodium::Cipher
       Bytes.new(0)
     end
 
+    # Use as a CSPRNG.
+    def random_bytes(bytes : Bytes) : Bytes
+      # TODO: Switch to memset
+      Sodium.memzero bytes
+      update bytes, bytes
+      bytes
+    end
+
+    # Use as a CSPRNG.
+    def random_bytes(size : Int) : Bytes
+      bytes = Bytes.new size
+      update bytes, bytes
+      bytes
+    end
+
     # Always returns false. Sadness...
     def edible?
       false