debug assert over nonce_tag len

Author: G8XSU

src/util/key_obfuscator.rs

@@ -66,6 +66,7 @@ impl KeyObfuscator {
 			obfuscated_key_bytes.split_at(obfuscated_key_bytes.len() - TAG_LENGTH - NONCE_LENGTH - TAG_LENGTH);
 		let (tag, remaining) = remaining.split_at(TAG_LENGTH);
 		let (wrapped_nonce_bytes, wrapped_nonce_tag) = remaining.split_at(NONCE_LENGTH);
+		debug_assert_eq!(wrapped_nonce_tag.len(), TAG_LENGTH);
 
 		// Unwrap wrapped_nonce to get nonce.
 		let mut wrapped_nonce = [0u8; NONCE_LENGTH];