X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=blobdiff_plain;f=lightning%2Fsrc%2Fln%2Finbound_payment.rs;h=f9e10880afbe5f5eae122d48220f5b8e5dcd9757;hb=d0f0d9c19f86e5056bbb768e06c6d5f2fb6b925d;hp=25e79e3bc15db59fab2d05b7edd33bd8a6b9a7d9;hpb=4732484520838081703fe61ef4bd8c4531637b85;p=rust-lightning

diff --git a/lightning/src/ln/inbound_payment.rs b/lightning/src/ln/inbound_payment.rs
index 25e79e3b..f9e10880 100644
--- a/lightning/src/ln/inbound_payment.rs
+++ b/lightning/src/ln/inbound_payment.rs
@@ -86,6 +86,13 @@ impl ExpandedKey {
 		hmac.input(&nonce.0);
 		hmac
 	}
+
+	/// Encrypts or decrypts the given `bytes`. Used for data included in an offer message's
+	/// metadata (e.g., payment id).
+	pub(crate) fn crypt_for_offer(&self, mut bytes: [u8; 32], nonce: Nonce) -> [u8; 32] {
+		ChaCha20::encrypt_single_block_in_place(&self.offers_encryption_key, &nonce.0, &mut bytes);
+		bytes
+	}
 }
 
 /// A 128-bit number used only once.