As part of an SOAP integration I'm doing. I've requirement where I need to pass the BinarySecurityToken in the header of the SOAP request. Unfortunately the WSDL will not contain the header information, so wsdl2apex convertor will not generate the associated Header classes.I've included the below snippet which is not working and erroring out as 'System.CalloutException: IO Exception: input contained no data'

I've added below two classes in the Webservice stub class that's generated-

    public class Security_element{ 
        public Security_element(String securityToken){
            this.securityToken = new BinarySecurityToken_element(securityToken);
            this.wsse = 'http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd';
        }
        
        public BinarySecurityToken_element securityToken;
        public String wsse;
        private String[] wsse_att_info = new String[] {'xmlns:wsse'};
        private String[] securityToken_type_info = new String[]  {'wsse:BinarySecurityToken','http://www.w3.org/2001/XMLSchema','element','1','1','false'};
        private String[] apex_schema_type_info = new String[]{'http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd','true','false'};
        private String[] field_order_type_info = new String[]{'securityToken'};
    }
    
    public class BinarySecurityToken_element {
    
        public BinarySecurityToken_element(String securityToken) { 
             this.securityToken=securityToken;
             this.myValueType='wsse:X509v3';
             this.myEncodingType='wsse:Base64Binary'; 
             this.myID='X509Token';
        }
        public String securityToken;
        public String myValueType;
        public String myEncodingType;
        public String myID;
        
        private String[] securityToken_type_info = new String[]{'wsse:BinarySecurityToken','http://www.w3.org/2001/XMLSchema','element','1','1','false'};   
        private String[] myValueType_type_info=new String[]{'ValueType'};
        private String[] myEncodingType_type_info=new String[]{'EncodingType'};
        private String[] myID_type_info=new String[]{'Id'};
        private String[] apex_schema_type_info = new String[]{'http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd','true','false'};
        private String[] field_order_type_info = new String[]{'securityToken'};              
    }

******************This will go to class that makes the callout*************************

List docList = [select id, name,Body from document where name = 'secToken.txt']; //Docuement contains the security token I need to pass in the header
public wsSampleProjectV1.Security_element sec = new wsSampleProjectV2.Security_element(EncodingUtil.base64Encode(docList[0].body));
private String sec_hns = 'Security=http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd'; 

*********SOAP Request Header that I need to pass is -

  <soapenv:Header>
      <wsse:Security xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd">
         <wsse:BinarySecurityToken ValueType="wsse:X509v3" EncodingType="wsse:Base64Binary" Id="X509Token">
                ---Encoded BinarySecurityToken goes here------
 
         </wsse:BinarySecurityToken>
      </wsse:Security>
      
   </soapenv:Header>

Any help on what's going wrong is much appreciated.