From 7b29223e95c5c7ae36791f3ee832decf322b8277 Mon Sep 17 00:00:00 2001
From: Sat <792024+santyr@users.noreply.github.com>
Date: Tue, 13 May 2025 03:47:08 -0600
Subject: [PATCH] feat: add verify_preimage utility function (#3153)

---
 lnbits/utils/crypto.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lnbits/utils/crypto.py b/lnbits/utils/crypto.py
index 10bde8553..bfc4b35dd 100644
--- a/lnbits/utils/crypto.py
+++ b/lnbits/utils/crypto.py
@@ -23,6 +23,12 @@ def fake_privkey(secret: str) -> str:
     ).hex()
 
 
+def verify_preimage(preimage: str, payment_hash: str) -> bool:
+    preimage_bytes = bytes.fromhex(preimage)
+    calculated_hash = sha256(preimage_bytes).hexdigest()
+    return calculated_hash == payment_hash
+
+
 class AESCipher:
     """This class is compatible with crypto-js/aes.js