signParams.cbSize = sizeof(CRYPT_SIGN_MESSAGE_PARA);
signParams.dwMsgEncodingType = PKCS_7_ASN_ENCODING | X509_ASN_ENCODING;
signParams.pSigningCert = this->pSignCert;
signParams.HashAlgorithm.pszObjId = (LPSTR)szOID_CP_GOST_R3411;
signParams.HashAlgorithm.Parameters.cbData = NULL;
signParams.cMsgCert = 0;
signParams.rgpMsgCert = NULL;
signParams.cAuthAttr = 0;
signParams.rgAuthAttr = NULL;
signParams.dwInnerContentType = 0;
signParams.cMsgCrl = 0;
signParams.cUnauthAttr = 0;
signParams.dwFlags = 0;
signParams.pvHashAuxInfo = NULL;

BYTE* pbSignedMsgBlob;
DWORD cbSignedMsgBlob;

const BYTE* msgsArray[] = { (unsigned char*)msg.c_str() };
DWORD msgsSizeArray[1] = { msg.length() + 1 };

	
if (!CryptSignMessage(&signParams, !withData, 1, msgsArray, 
		msgsSizeArray, NULL, &cbSignedMsgBlob)) {

	//throw CGRSignMessage("");

}

//Выделение места для буфера
if (!(pbSignedMsgBlob = new BYTE[cbSignedMsgBlob])) {

	//throw CGRSignMessage("");

}

//Формирование подписи
if (!CryptSignMessage(&signParams, FALSE, 1, msgsArray, 
		msgsSizeArray, pbSignedMsgBlob, &cbSignedMsgBlob)) {

	//throw CGRSignMessage("");

}

return byte2base64(pbSignedMsgBlob, cbSignedMsgBlob);