diff --git a/include/Domito.h b/include/Domito.h
index 922a0bf..fce9dde 100644
--- a/include/Domito.h
+++ b/include/Domito.h
@@ -30,12 +30,13 @@ typedef EVT_DOMITO_ALLOCATE_ROUTINE* PFN_DOMITO_ALLOCATE_ROUTINE;
  // This structure encapsulates a signature used in verifying executable files.
  // 
 #if !defined(WIN_CERTIFICATE)
-typedef struct _WIN_CERTIFICATE {
+typedef struct _WIN_CERTIFICATE
+{
     DWORD dwLength;
-    WORD  wRevision;
-    WORD  wCertificateType;
-    BYTE  bCertificate[ANYSIZE_ARRAY];
-} WIN_CERTIFICATE, * LPWIN_CERTIFICATE;
+    WORD wRevision;
+    WORD wCertificateType;
+    BYTE bCertificate[ANYSIZE_ARRAY];
+} WIN_CERTIFICATE, *LPWIN_CERTIFICATE;
 #endif
 
 //
@@ -103,9 +104,9 @@ _IRQL_requires_max_(PASSIVE_LEVEL)
 EXTERN_C
 NTSTATUS
 DomitoFindModuleBaseAddress(
-    _In_ STRING ModuleName,
     _In_ PFN_DOMITO_ALLOCATE_ROUTINE Allocator,
-    _Inout_opt_ PVOID * ModuleBase
+    _In_ STRING ModuleName,
+    _Inout_opt_ PVOID* ModuleBase
 );
 
 //
@@ -119,7 +120,7 @@ NTSTATUS
 DomitoFindExportedFunctionAddress(
     _In_ PVOID ModuleBase,
     _In_ STRING FunctionName,
-    _Inout_opt_ PVOID * FunctionAddress
+    _Inout_opt_ PVOID* FunctionAddress
 );
 
 //
@@ -136,7 +137,7 @@ DomitoMemorySearchPattern(
     _In_ SIZE_T puLen,
     _In_ PVOID pcBase,
     _In_ SIZE_T puSize,
-    _Outptr_result_maybenull_ PVOID * ppMatch
+    _Outptr_result_maybenull_ PVOID* ppMatch
 );
 
 //
@@ -197,3 +198,20 @@ DomitoGetProcessImageName(
     _In_ ULONG ProcessId,
     _Inout_ PUNICODE_STRING* ProcessImageName
 );
+
+_Success_(return == STATUS_SUCCESS)
+_Must_inspect_result_
+_IRQL_requires_max_(PASSIVE_LEVEL)
+EXTERN_C
+NTSTATUS
+DomitoValidateFileLegacyMode(
+    _In_ PFN_DOMITO_ALLOCATE_ROUTINE Allocator,
+    _In_ HANDLE FileHandle,
+    _In_ PVOID Hash,
+    _In_ UINT32 HashSize,
+    _In_ ALG_ID HashAlgId,
+    _In_ const IMAGE_DATA_DIRECTORY* SecurityDirectory,
+    _Inout_ MINCRYPT_POLICY_INFO* PolicyInfo,
+    _Out_ LARGE_INTEGER* SigningTime,
+    _Inout_ MINCRYPT_POLICY_INFO* TimeStampPolicyInfo
+);
diff --git a/src/Domito.cpp b/src/Domito.cpp
index e75fb73..c5f00ae 100644
--- a/src/Domito.cpp
+++ b/src/Domito.cpp
@@ -84,8 +84,8 @@ _Must_inspect_result_
 _IRQL_requires_max_(PASSIVE_LEVEL)
 NTSTATUS
 DomitoFindModuleBaseAddress(
-    _In_ STRING ModuleName,
     _In_ PFN_DOMITO_ALLOCATE_ROUTINE Allocator,
+    _In_ STRING ModuleName,    
     _Inout_opt_ PVOID * ModuleBase
 )
 {
@@ -760,3 +760,153 @@ cleanUp:
     return status;
 }
 #pragma code_seg()
+
+_Success_(return == STATUS_SUCCESS)
+_Must_inspect_result_
+_IRQL_requires_max_(PASSIVE_LEVEL)
+#pragma code_seg("PAGED")
+NTSTATUS
+DomitoValidateFileLegacyMode(
+    _In_ PFN_DOMITO_ALLOCATE_ROUTINE Allocator,
+    _In_ HANDLE FileHandle,
+    _In_ PVOID Hash,
+    _In_ UINT32 HashSize,
+    _In_ ALG_ID HashAlgId,
+    _In_ const IMAGE_DATA_DIRECTORY * SecurityDirectory,
+    _Inout_ MINCRYPT_POLICY_INFO * PolicyInfo,
+    _Out_ LARGE_INTEGER * SigningTime,
+    _Inout_ MINCRYPT_POLICY_INFO * TimeStampPolicyInfo
+)
+{
+    PAGED_CODE();
+
+    NTSTATUS status = STATUS_SUCCESS;
+    PVOID certDirectory = nullptr;
+    KAPC_STATE systemContext = {};
+
+    do
+    {
+        SigningTime->QuadPart = 0;
+
+        CiFreePolicyInfo(PolicyInfo);
+        CiFreePolicyInfo(TimeStampPolicyInfo);
+
+        if (HashSize != MINCRYPT_SHA1_LENGTH)
+        {
+            status = STATUS_INVALID_IMAGE_HASH;
+            break;
+        }
+
+        if (SecurityDirectory->Size != 0u &&
+            SecurityDirectory->VirtualAddress != 0u)
+        {
+            certDirectory = Allocator(SecurityDirectory->Size);
+            if (certDirectory == NULL)
+            {
+                status = STATUS_INSUFFICIENT_RESOURCES;
+                break;
+            }
+
+            LARGE_INTEGER offset = {};
+            IO_STATUS_BLOCK ioStatusBlock = {};
+
+            offset.LowPart = SecurityDirectory->VirtualAddress;
+
+            status = ZwReadFile(
+                FileHandle,
+                NULL,
+                NULL,
+                NULL,
+                &ioStatusBlock,
+                certDirectory,
+                SecurityDirectory->Size,
+                &offset,
+                NULL
+            );
+
+            if (status == STATUS_PENDING)
+            {
+                ZwWaitForSingleObject(
+                    FileHandle,
+                    FALSE,
+                    NULL
+                );
+
+                MemoryBarrier();
+                status = ioStatusBlock.Status;
+            }
+
+            if (!NT_SUCCESS(status))
+            {
+                break;
+            }
+
+            KeStackAttachProcess(PsInitialSystemProcess, &systemContext);
+            {
+                status = CiCheckSignedFile(
+                    Hash,
+                    HashSize,
+                    HashAlgId,
+                    certDirectory,
+                    SecurityDirectory->Size,
+                    PolicyInfo,
+                    SigningTime,
+                    TimeStampPolicyInfo
+                );
+            }
+            KeUnstackDetachProcess(&systemContext);
+
+            if (NT_SUCCESS(status))
+            {
+                break;
+            }
+
+            if (status != STATUS_INVALID_IMAGE_HASH)
+            {
+                break;
+            }
+        }
+
+        KeStackAttachProcess(PsInitialSystemProcess, &systemContext);
+        {
+            status = CiVerifyHashInCatalog(
+                Hash,
+                HashSize,
+                HashAlgId,
+                FALSE,
+                0,
+                0x2007F,
+                PolicyInfo,
+                NULL,
+                SigningTime,
+                TimeStampPolicyInfo
+            );
+
+            if (status == STATUS_INVALID_IMAGE_HASH)
+            {
+                status = CiVerifyHashInCatalog(
+                    Hash,
+                    HashSize,
+                    HashAlgId,
+                    TRUE,
+                    0,
+                    0x2007F,
+                    PolicyInfo,
+                    NULL,
+                    SigningTime,
+                    TimeStampPolicyInfo
+                );
+            }
+        }
+        KeUnstackDetachProcess(&systemContext);
+
+    } while (FALSE);
+
+    if (certDirectory)
+    {
+        ExFreePool(certDirectory);
+    }
+    
+    return status;
+}
+#pragma code_seg()