From 3db5798246a9bfdcabee60d27740ba8783b27e22 Mon Sep 17 00:00:00 2001
From: Matt Corallo <git@bluematt.me>
Date: Thu, 2 Aug 2018 20:05:14 -0400
Subject: [PATCH] Stub out ChaCha20 non-HMAC encryption/decryption in
 fuzztarget

---
 src/ln/channelmanager.rs        |  2 +-
 src/util/chacha20poly1305rfc.rs | 24 +++++++++++++++++++++---
 2 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/src/ln/channelmanager.rs b/src/ln/channelmanager.rs
index 76272d4e6..29d260ba6 100644
--- a/src/ln/channelmanager.rs
+++ b/src/ln/channelmanager.rs
@@ -19,13 +19,13 @@ use ln::msgs;
 use ln::msgs::{HandleError,ChannelMessageHandler,MsgEncodable,MsgDecodable};
 use util::{byte_utils, events, internal_traits, rng};
 use util::sha2::Sha256;
+use util::chacha20poly1305rfc::ChaCha20;
 
 use crypto;
 use crypto::mac::{Mac,MacResult};
 use crypto::hmac::Hmac;
 use crypto::digest::Digest;
 use crypto::symmetriccipher::SynchronousStreamCipher;
-use crypto::chacha20::ChaCha20;
 
 use std::{ptr, mem};
 use std::collections::HashMap;
diff --git a/src/util/chacha20poly1305rfc.rs b/src/util/chacha20poly1305rfc.rs
index 9c86d44b4..1aeaf61d2 100644
--- a/src/util/chacha20poly1305rfc.rs
+++ b/src/util/chacha20poly1305rfc.rs
@@ -13,12 +13,13 @@
 #[cfg(not(feature = "fuzztarget"))]
 mod real_chachapoly {
 	use crypto::aead::{AeadEncryptor,AeadDecryptor};
-	use crypto::chacha20::ChaCha20;
 	use crypto::symmetriccipher::SynchronousStreamCipher;
 	use crypto::poly1305::Poly1305;
 	use crypto::mac::Mac;
 	use crypto::util::fixed_time_eq;
 
+	pub use crypto::chacha20::ChaCha20;
+
 	use util::byte_utils;
 
 	#[derive(Clone, Copy)]
@@ -104,11 +105,12 @@ mod real_chachapoly {
 	}
 }
 #[cfg(not(feature = "fuzztarget"))]
-pub use self::real_chachapoly::ChaCha20Poly1305RFC;
+pub use self::real_chachapoly::{ChaCha20Poly1305RFC, ChaCha20};
 
 #[cfg(feature = "fuzztarget")]
 mod fuzzy_chachapoly {
 	use crypto::aead::{AeadEncryptor,AeadDecryptor};
+	use crypto::symmetriccipher::SynchronousStreamCipher;
 
 	#[derive(Clone, Copy)]
 	pub struct ChaCha20Poly1305RFC {
@@ -155,6 +157,22 @@ mod fuzzy_chachapoly {
 			true
 		}
 	}
+
+	pub struct ChaCha20 {}
+
+	impl ChaCha20 {
+		pub fn new(key: &[u8], nonce: &[u8]) -> ChaCha20 {
+			assert!(key.len() == 16 || key.len() == 32);
+			assert!(nonce.len() == 8 || nonce.len() == 12);
+			Self {}
+		}
+	}
+
+	impl SynchronousStreamCipher for ChaCha20 {
+		fn process(&mut self, input: &[u8], output: &mut [u8]) {
+			output.copy_from_slice(input);
+		}
+	}
 }
 #[cfg(feature = "fuzztarget")]
-pub use self::fuzzy_chachapoly::ChaCha20Poly1305RFC;
+pub use self::fuzzy_chachapoly::{ChaCha20Poly1305RFC, ChaCha20};
-- 
2.39.5