crypt32: Constify some variables.
diff --git a/dlls/crypt32/crypt32_private.h b/dlls/crypt32/crypt32_private.h
index 46d4797..07c6382 100644
--- a/dlls/crypt32/crypt32_private.h
+++ b/dlls/crypt32/crypt32_private.h
@@ -79,7 +79,7 @@
     CRYPT_HASH_BLOB            hash;
 } CRYPT_DIGESTED_DATA;
 
-BOOL CRYPT_AsnEncodePKCSDigestedData(CRYPT_DIGESTED_DATA *digestedData,
+BOOL CRYPT_AsnEncodePKCSDigestedData(const CRYPT_DIGESTED_DATA *digestedData,
  void *pvData, DWORD *pcbData);
 
 typedef struct _CRYPT_SIGNED_INFO