Stateless verification of InvoiceRequest

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

diff --git a/lightning/src/offers/invoice_request.rs b/lightning/src/offers/invoice_request.rs
index 8bb5737c3f789b1f473872320697a9dc7fe3fb41..79dff614b68f2772a40834e72cec72cd4fd4c49e 100644 (file)
--- a/lightning/src/offers/invoice_request.rs
+++ b/lightning/src/offers/invoice_request.rs
@@ -54,15 +54,16 @@
 
 use bitcoin::blockdata::constants::ChainHash;
 use bitcoin::network::constants::Network;
-use bitcoin::secp256k1::{Message, PublicKey};
+use bitcoin::secp256k1::{Message, PublicKey, Secp256k1, self};
 use bitcoin::secp256k1::schnorr::Signature;
 use core::convert::TryFrom;
 use crate::io;
 use crate::ln::PaymentHash;
 use crate::ln::features::InvoiceRequestFeatures;
+use crate::ln::inbound_payment::ExpandedKey;
 use crate::ln::msgs::DecodeError;
 use crate::offers::invoice::{BlindedPayInfo, InvoiceBuilder};
-use crate::offers::merkle::{SignError, SignatureTlvStream, SignatureTlvStreamRef, self};
+use crate::offers::merkle::{SignError, SignatureTlvStream, SignatureTlvStreamRef, TlvStream, self};
 use crate::offers::offer::{Offer, OfferContents, OfferTlvStream, OfferTlvStreamRef};
 use crate::offers::parse::{ParseError, ParsedMessage, SemanticError};
 use crate::offers::payer::{PayerContents, PayerTlvStream, PayerTlvStreamRef};
@@ -372,6 +373,13 @@ impl InvoiceRequest {
                InvoiceBuilder::for_offer(self, payment_paths, created_at, payment_hash)
        }
 
+       /// Verifies that the request was for an offer created using the given key.
+       pub fn verify<T: secp256k1::Signing>(
+               &self, key: &ExpandedKey, secp_ctx: &Secp256k1<T>
+       ) -> bool {
+               self.contents.offer.verify(TlvStream::new(&self.bytes), key, secp_ctx)
+       }
+
        #[cfg(test)]
        fn as_tlv_stream(&self) -> FullInvoiceRequestTlvStreamRef {
                let (payer_tlv_stream, offer_tlv_stream, invoice_request_tlv_stream) =