From a271530a7b3b04cd3da2a8328de4c2e4bf7b93ce Mon Sep 17 00:00:00 2001
From: Evan Feenstra <evanfeenstra@gmail.com>
Date: Tue, 14 Jun 2022 14:11:44 -0700
Subject: [PATCH] working signing

---
 sphinx-key/Cargo.toml  |  8 +++++---
 sphinx-key/src/tiny.rs | 15 ++++++++++++---
 2 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/sphinx-key/Cargo.toml b/sphinx-key/Cargo.toml
index 29a2dc6..219519e 100644
--- a/sphinx-key/Cargo.toml
+++ b/sphinx-key/Cargo.toml
@@ -32,9 +32,11 @@ serde_urlencoded = "0.7.1"
 serde = { version = "1.0.137", default-features = false }
 serde_json = { version = "1.0.81", default-features = false }
 
-[patch.crates-io]
-# Low-memory version of secp256k1 with static precomputation
-secp256k1 = { git = "https://github.com/devrandom/rust-secp256k1.git", rev = "4e745ebe7e4c9cd0a7e9c8d5c42e989522e52f71", feature = ["lowmemory"] }
+secp256k1 = { git = "https://github.com/devrandom/rust-secp256k1.git", rev = "4e745ebe7e4c9cd0a7e9c8d5c42e989522e52f71", features = ["lowmemory"] }
+
+# [patch.crates-io]
+# # Low-memory version of secp256k1 with static precomputation
+# secp256k1 = { git = "https://github.com/devrandom/rust-secp256k1.git", rev = "4e745ebe7e4c9cd0a7e9c8d5c42e989522e52f71" }
 
 [build-dependencies]
 embuild = "0.29"
diff --git a/sphinx-key/src/tiny.rs b/sphinx-key/src/tiny.rs
index bd1eb15..e5040ac 100644
--- a/sphinx-key/src/tiny.rs
+++ b/sphinx-key/src/tiny.rs
@@ -1,12 +1,21 @@
 #![feature(once_cell)]
 
-use sphinx_key_signer::lightning_signer::bitcoin::secp256k1::Secp256k1;
+use secp256k1::{Message, PublicKey, Secp256k1, SecretKey};
+// use sphinx_key_signer::lightning_signer::bitcoin::secp256k1::Secp256k1;
 
 fn main() -> anyhow::Result<()> {
     esp_idf_sys::link_patches();
 
-    let ctx = Secp256k1::new();
+    let secp = Secp256k1::new();
+    let secret_key = SecretKey::from_slice(&[0xcd; 32]).expect("32 bytes, within curve order");
+    let public_key = PublicKey::from_secret_key(&secp, &secret_key);
+    // This is unsafe unless the supplied byte slice is the output of a cryptographic hash function.
+    // See the above example for how to use this library together with `bitcoin_hashes`.
+    let message = Message::from_slice(&[0xab; 32]).expect("32 bytes");
 
+    let sig = secp.sign(&message, &secret_key);
+    assert!(secp.verify(&message, &sig, &public_key).is_ok());
+
+    println!("signature verified!");
     Ok(())
 }
-