From f462d8ac70d11f5c02d74062223af5112a465339 Mon Sep 17 00:00:00 2001
From: Matt Corallo <git@bluematt.me>
Date: Thu, 26 Apr 2018 19:44:24 -0400
Subject: [PATCH] fuzztarget sha -> XOR, crates secp256k1

---
 Cargo.toml       |  2 +-
 fuzz/Cargo.toml  |  2 +-
 src/util/sha2.rs | 16 +++++++---------
 3 files changed, 9 insertions(+), 11 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index 3b692790..e8570e25 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -19,7 +19,7 @@ fuzztarget = ["secp256k1/fuzztarget", "bitcoin/fuzztarget"]
 bitcoin = "0.13"
 rust-crypto = "0.2"
 rand = "0.4"
-secp256k1 = { git = "https://github.com/rust-bitcoin/rust-secp256k1", branch = "master" }
+secp256k1 = "0.9"
 
 [build-dependencies]
 gcc = "0.3"
diff --git a/fuzz/Cargo.toml b/fuzz/Cargo.toml
index 521e93d3..bcaa2932 100644
--- a/fuzz/Cargo.toml
+++ b/fuzz/Cargo.toml
@@ -18,7 +18,7 @@ honggfuzz_fuzz = ["honggfuzz"]
 [dependencies]
 lightning = { path = "..", features = ["fuzztarget"] }
 bitcoin = { version = "0.13", features = ["fuzztarget"] }
-secp256k1 = { git = "https://github.com/rust-bitcoin/rust-secp256k1", branch = "master" , features=["fuzztarget"]}
+secp256k1 = { version = "0.9", features=["fuzztarget"] }
 rust-crypto = "0.2"
 honggfuzz = { version = "0.5", optional = true }
 afl = { version = "0.3", optional = true }
diff --git a/src/util/sha2.rs b/src/util/sha2.rs
index 31616f50..2c9eab93 100644
--- a/src/util/sha2.rs
+++ b/src/util/sha2.rs
@@ -4,33 +4,31 @@ pub use crypto::sha2::Sha256;
 #[cfg(feature = "fuzztarget")]
 mod fuzzy_sha {
 	use crypto::digest::Digest;
-	use crypto::sha2;
 
-	#[derive(Clone, Copy)]
 	pub struct Sha256 {
-		state: sha2::Sha256,
+		state: u8,
 	}
 
 	impl Sha256 {
 		pub fn new() -> Sha256 {
 			Sha256 {
-				state: sha2::Sha256::new(),
+				state: 0,
 			}
 		}
 	}
 
 	impl Digest for Sha256 {
 		fn result(&mut self, data: &mut [u8]) {
-			self.state.result(data);
+			data[0] = self.state;
 			for i in 1..32 {
 				data[i] = 0;
 			}
 		}
 
-		fn input(&mut self, data: &[u8]) { self.state.input(data); }
-		fn reset(&mut self) { self.state.reset(); }
-		fn output_bits(&self) -> usize { self.state.output_bits() }
-		fn block_size(&self) -> usize { self.state.block_size() }
+		fn input(&mut self, data: &[u8]) { for i in data { self.state ^= i; } }
+		fn reset(&mut self) { self.state = 0; }
+		fn output_bits(&self) -> usize { 256 }
+		fn block_size(&self) -> usize { 64 }
 	}
 }
 #[cfg(feature = "fuzztarget")]
-- 
2.30.2