wintrust: Decode a zero-length OID to an empty string.

dlls/wintrust/asn.c

@@ -1878,6 +1878,8 @@ static BOOL WINAPI CRYPT_AsnDecodeOidIgnoreTag(DWORD dwCertEncodingType,
                 }
             }
         }
+        else
+            bytesNeeded += 1;
         if (!pvStructInfo)
             *pcbStructInfo = bytesNeeded;
         else if (*pcbStructInfo < bytesNeeded)
@@ -1888,12 +1890,13 @@ static BOOL WINAPI CRYPT_AsnDecodeOidIgnoreTag(DWORD dwCertEncodingType,
         }
         else
         {
+            LPSTR pszObjId = *(LPSTR *)pvStructInfo;
+
+            *pszObjId = 0;
             if (dataLen)
             {
                 const BYTE *ptr;
-                LPSTR pszObjId = *(LPSTR *)pvStructInfo;
 
-                *pszObjId = 0;
                 pszObjId += sprintf(pszObjId, "%d.%d", pbEncoded[1 + lenBytes] / 40,
                  pbEncoded[1 + lenBytes] - (pbEncoded[1 + lenBytes] /
                  40) * 40);
@@ -1914,8 +1917,6 @@ static BOOL WINAPI CRYPT_AsnDecodeOidIgnoreTag(DWORD dwCertEncodingType,
                     pszObjId += sprintf(pszObjId, ".%d", val);
                 }
             }
-            else
-                *(LPSTR *)pvStructInfo = NULL;
             *pcbStructInfo = bytesNeeded;
         }
     }

dlls/wintrust/tests/asn.c

@@ -682,13 +682,11 @@ static void test_decodeSPCIndirectDataContent(void)
     if (ret)
     {
         indirectData = (SPC_INDIRECT_DATA_CONTENT *)buf;
-        todo_wine
         ok(indirectData->Data.pszObjId != NULL, "Expected non-NULL data objid\n");
         if (indirectData->Data.pszObjId)
             ok(!strcmp(indirectData->Data.pszObjId, ""),
              "Expected empty data objid\n");
         ok(indirectData->Data.Value.cbData == 0, "Expected no data value\n");
-        todo_wine
         ok(indirectData->DigestAlgorithm.pszObjId != NULL,
          "Expected non-NULL digest algorithm objid\n");
         if (indirectData->DigestAlgorithm.pszObjId)