cryptoapi - Adding Response from TSA to CRYPT_SIGN_MESSAGE_PARA for CryptSignMessage (c++, Crypto Api) -

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i'm struggling how must add response tsa server cryptsignmessage?

using pkcs#7. have message digest , sign cryptsignmessage crypto api. so: 

// initialize signature structure. crypt_sign_message_para  sigparams; sigparams.cbsize = sizeof(crypt_sign_message_para); sigparams.dwmsgencodingtype = my_encoding_type; sigparams.psigningcert = hcontext; sigparams.hashalgorithm.pszobjid = szoid_rsa_sha1rsa; sigparams.hashalgorithm.parameters.cbdata = null; sigparams.cmsgcert = 1; sigparams.rgpmsgcert = &hcontext; sigparams.dwinnercontenttype = 0; sigparams.cmsgcrl = 0; sigparams.cunauthattr = 0; sigparams.dwflags = 0; sigparams.pvhashauxinfo = null; sigparams.cauthattr = 0; sigparams.rgauthattr = null;  // first, size of signed blob. if(cryptsignmessage(     &sigparams,     false,     1,     messagearray,     messagesizearray,     null,     &cbsignedmessageblob)) {     printf("%d bytes needed encoded blob.", cbsignedmessageblob); } else {     myhandleerror();     freturn = false;     exit_signmessage(); }  // allocate memory signed blob. if(!(pbsignedmessageblob =     (byte*)malloc(cbsignedmessageblob))) {     myhandleerror();     exit_signmessage(); }  // signed message blob. if(cryptsignmessage(       &sigparams,       true,       1,       messagearray,       messagesizearray,       pbsignedmessageblob,       &cbsignedmessageblob)) {     printf("the message signed successfully. \n");       // pbsignedmessageblob contains signed blob.     freturn = true; } else {     myhandleerror();     freturn = false;     exit_signmessage(); }

now want use tsa server timestamp digest, i'm not sure how include this. have rfc3161 timestamp request; send tsa , receive rfc3161 timestamp response (probably using libcurl). how should incorporate response sigparams? must extract timestamptoken , store unauthenticated counter signature? like:

crypt_attr_blob cablob[1]; crypt_attribute ca[1];     cablob[0].cbdata = tstresponsesize;  cablob[0].pbdata = tstresponse; // response tsa  ca[0].pszobjid = "1.2.840.113549.9.6"; // object identifier counter signature ca[0].cvalue = 1; ca[0].rgvalue = cablob;

and set sigparams:

sigparams.cunauthatt = 1; sigparams.rgunauthattr = ca;

any advice appreciated. thanks, magda


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