From a50016b3da4dd8ae66e2467f542fa38bc8b8d038 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Wed, 7 Jun 2023 17:24:46 +0100
Subject: [PATCH] tor-hscrypto: implement Rng.gen() for RendCookie

---
 Cargo.lock                     | 1 +
 crates/tor-hscrypto/Cargo.toml | 1 +
 crates/tor-hscrypto/src/lib.rs | 6 ++++++
 3 files changed, 8 insertions(+)

diff --git a/Cargo.lock b/Cargo.lock
index d5f82b4d4..adadf7e48 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4197,6 +4197,7 @@ dependencies = [
  "humantime 2.1.0",
  "itertools",
  "paste",
+ "rand 0.8.5",
  "rand_core 0.6.4",
  "safelog",
  "serde",
diff --git a/crates/tor-hscrypto/Cargo.toml b/crates/tor-hscrypto/Cargo.toml
index d93ecff38..260e1854f 100644
--- a/crates/tor-hscrypto/Cargo.toml
+++ b/crates/tor-hscrypto/Cargo.toml
@@ -21,6 +21,7 @@ derive_more = "0.99.3"
 digest = "0.10.0"
 itertools = "0.10.1"
 paste = "1"
+rand = "0.8"
 rand_core = "0.6.2"
 safelog = { path = "../safelog", version = "0.3.1" }
 serde = { version = "1.0.103", features = ["derive"] }
diff --git a/crates/tor-hscrypto/src/lib.rs b/crates/tor-hscrypto/src/lib.rs
index 484c07990..a5e34b6bd 100644
--- a/crates/tor-hscrypto/src/lib.rs
+++ b/crates/tor-hscrypto/src/lib.rs
@@ -91,3 +91,9 @@ define_bytes! {
 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
 pub struct RendCookie([u8; REND_COOKIE_LEN]);
 }
+
+impl rand::distributions::Distribution<RendCookie> for rand::distributions::Standard {
+    fn sample<R: rand::Rng + ?Sized>(&self, rng: &mut R) -> RendCookie {
+        RendCookie(rng.gen::<[u8; REND_COOKIE_LEN]>().into())
+    }
+}