From 9e31b6cc5b116800d280d23317f8b2eb3a191754 Mon Sep 17 00:00:00 2001
From: Alivecow <mail@ta-lotz.de>
Date: Tue, 3 Dec 2024 22:58:10 +0100
Subject: [PATCH] fix: Add ciphertext padding to gcm_crack

---
 src/tasks/tasks01/gcm_crack.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/tasks/tasks01/gcm_crack.rs b/src/tasks/tasks01/gcm_crack.rs
index 6cabe38..5dc2236 100644
--- a/src/tasks/tasks01/gcm_crack.rs
+++ b/src/tasks/tasks01/gcm_crack.rs
@@ -34,7 +34,10 @@ struct Message {
 
 fn parse_message(val: &Value) -> Result<(Message, Polynomial)> {
     let ciphertext_text: String = serde_json::from_value(val["ciphertext"].clone())?;
-    let ciphertext_bytes: Vec<u8> = BASE64_STANDARD.decode(ciphertext_text)?;
+    let mut ciphertext_bytes: Vec<u8> = BASE64_STANDARD.decode(ciphertext_text)?;
+    if ciphertext_bytes.len() % 16 != 0 {
+        ciphertext_bytes.append(vec![0u8; 16 - (ciphertext_bytes.len() % 16)].as_mut());
+    }
     let ciphertext_chunks: Vec<FieldElement> = ciphertext_bytes
         .chunks(16)
         .into_iter()