Merge pull request #2162 from jkczyz/2023-04-invoice-hash

[rust-lightning] / lightning / src / offers / invoice.rs

diff --git a/lightning/src/offers/invoice.rs b/lightning/src/offers/invoice.rs
index 49c03a443475cb0c0c4f6ed556f5a242cda7d40b..48b8cec3536b2ab0576feca6826ed960f46d7a60 100644 (file)
--- 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(),
                        (