add chacha_decrypt

smx-smx · Apr 6, 2024 · 651b9ed · 651b9ed
1 parent b6a8a91
commit 651b9ed
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Showing 2 changed files with 20 additions and 0 deletions.
diff --git a/xzre.h b/xzre.h
@@ -1066,6 +1066,23 @@ extern BOOL process_shared_libraries(backdoor_shared_libraries_data_t *data);
  */
 extern BOOL process_shared_libraries_map(struct link_map *r_map, backdoor_shared_libraries_data_t *data);
 
+/**
+ * @brief decrypts a buffer with chacha20
+ * 
+ * @param in the input buffer to decrypt
+ * @param inl the length of the input buffer
+ * @param key the 256bit chacha key
+ * @param iv the 128bit chacha iv
+ * @param out the output buffer
+ * @param funcs OpenSSL imported functions
+ * @return BOOL TRUE if successful, FALSE otherwise
+ */
+extern BOOL chacha_decrypt(
+	u8 *in, int inl,
+	u8 *key, u8 *iv,
+	u8 *out, imported_funcs_t *funcs
+);
+
 extern global_context_t *global_ctx;
 
 #include "util.h"

diff --git a/xzre.lds b/xzre.lds
@@ -95,6 +95,9 @@ SECTIONS {
 
         "process_shared_libraries_map" = ".";
         *(.text.lzma_index_encoder_inia);
+
+        "chacha_decrypt" = ".";
+        *(.text.lzma_delta_encoder_inia);
     }
 } INSERT AFTER .text;