X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=blobdiff_plain;f=lightning%2Fsrc%2Foffers%2Finvoice.rs;h=48b8cec3536b2ab0576feca6826ed960f46d7a60;hb=1ceb41e08b2d76b23d2505a10a88db8d840895ca;hp=49c03a443475cb0c0c4f6ed556f5a242cda7d40b;hpb=9c2a3d090b618b98f2cd89c0193c4866331375ea;p=rust-lightning

diff --git a/lightning/src/offers/invoice.rs b/lightning/src/offers/invoice.rs
index 49c03a44..48b8cec3 100644
--- a/lightning/src/offers/invoice.rs
+++ b/lightning/src/offers/invoice.rs
@@ -469,6 +469,11 @@ impl Invoice {
 		self.signature
 	}
 
+	/// Hash that was used for signing the invoice.
+	pub fn signable_hash(&self) -> [u8; 32] {
+		merkle::message_digest(SIGNATURE_TAG, &self.bytes).as_ref().clone()
+	}
+
 	#[cfg(test)]
 	fn as_tlv_stream(&self) -> FullInvoiceTlvStreamRef {
 		let (payer_tlv_stream, offer_tlv_stream, invoice_request_tlv_stream, invoice_tlv_stream) =
@@ -937,6 +942,11 @@ mod tests {
 			).is_ok()
 		);
 
+		let digest = Message::from_slice(&invoice.signable_hash()).unwrap();
+		let pubkey = recipient_pubkey().into();
+		let secp_ctx = Secp256k1::verification_only();
+		assert!(secp_ctx.verify_schnorr(&invoice.signature, &digest, &pubkey).is_ok());
+
 		assert_eq!(
 			invoice.as_tlv_stream(),
 			(