Stub out ChaCha20 non-HMAC encryption/decryption in fuzztarget

Author: TheBlueMatt

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;

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};