From 3eb2c2ed62170f31850eeb8a234c085a667bc6d3 Mon Sep 17 00:00:00 2001
From: Leonard Kugis <leonard@kug.is>
Date: Wed, 30 Apr 2025 01:18:20 +0200
Subject: yara: Compiling identifiers for signatures.

---
 yara.py | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

(limited to 'yara.py')

diff --git a/yara.py b/yara.py
index 1ff6a36..f198473 100644
--- a/yara.py
+++ b/yara.py
@@ -174,8 +174,8 @@ class StringBlockRange(StringBlock):
 
 class YaraSignature(object):
 
-    # big endian, modifiers, n_blocks_data, index_map_data, blocks_data
-    __FORMAT = "<H{size_n_blocks_data}s{size_index_map_data}s{size_blocks_data}s"
+    # big endian, modifiers, identifier_size_data, identifier_data, n_blocks_data, index_map_data, blocks_data
+    __FORMAT = "<H{size_identifier_size_data}s{size_identifier_data}s{size_n_blocks_data}s{size_index_map_data}s{size_blocks_data}s"
 
     __STRING_TYPE_STRING = 0
     __STRING_TYPE_HEX = 1
@@ -314,13 +314,21 @@ class YaraSignature(object):
             blocks_data.extend(block.compile())
         index_elements = YaraIndex.from_size(len(self.blocks))
         index_data = YaraIndex.from_size(len(blocks_data))
+        identifier_data = self.identifier.encode("UTF-8")
+        index_identifier = YaraIndex.from_size(len(identifier_data))
         index_map = YaraIndexMap(index_data, indices)
         index_map_data = index_map.compile()
         n_blocks_data = index_elements.compile_index(len(self.blocks))
-        modifiers = self.modifiers_origin | (index_elements.compile_modifier()[0] << 8) | (index_data.compile_modifier()[0] << 10) | ((1 if store_index_map_string_blocks else 0) << 12)
-        fmt = self.__FORMAT.format(size_n_blocks_data=len(n_blocks_data), size_index_map_data=(len(index_map_data) if store_index_map_string_blocks else 0), size_blocks_data=len(blocks_data))
-        logger.debug("{}: fmt = {}, modifiers = {}, n_blocks_data = {}, index_map_data = {}, blocks_data = {}".format("YaraSignature", fmt, modifiers, n_blocks_data, index_map_data, blocks_data))
-        return struct.pack(fmt, modifiers, n_blocks_data, index_map_data, blocks_data)
+        identifier_size_data = index_identifier.compile_index(len(identifier_data))
+        modifiers = self.modifiers_origin | (index_elements.compile_modifier()[0] << 8) | (index_data.compile_modifier()[0] << 10) | ((1 if store_index_map_string_blocks else 0) << 14)
+        fmt = self.__FORMAT.format(
+            size_identifier_size_data=(len(identifier_size_data) if store_identifier_signature else 0),
+            size_identifier_data=(len(identifier_data) if store_identifier_signature else 0),
+            size_n_blocks_data=len(n_blocks_data),
+            size_index_map_data=(len(index_map_data) if store_index_map_string_blocks else 0),
+            size_blocks_data=len(blocks_data))
+        logger.debug("{}: fmt = {}, modifiers = {}, identifier_size_data = {}, identifier_data ={}, n_blocks_data = {}, index_map_data = {}, blocks_data = {}".format("YaraSignature", fmt, bin(modifiers), identifier_size_data, identifier_data, n_blocks_data, index_map_data, blocks_data))
+        return struct.pack(fmt, modifiers, identifier_size_data, identifier_data, n_blocks_data, index_map_data, blocks_data)
 
 class YaraCondition(object):
 
-- 
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