bool CertToECP3(const char *ccFileName, Byte *bECP, int iECPLen, Byte *bCert, int iCertLen) {

// ccFileName - путь куда будет сохранён результат
// bECP - файл ЭЦП (байтовый массив)
// iECPLen - длина массива
// bCert - файл сертификата (байтовый массив)
// iCertLen - длина массива

 HCRYPTMSG hMsg;
 CRYPT_INTEGER_BLOB cib;
 PCCERT_CONTEXT hCert = NULL;
 Byte *bRes;
 unsigned long int iSize;

 hMsg = CryptMsgOpenToDecode(X509_ASN_ENCODING | PKCS_7_ASN_ENCODING, 0, 0, NULL, NULL, NULL);
 if(!hMsg) {
  return false;
 }

 hCert = CertCreateCertificateContext(PKCS_7_ASN_ENCODING | X509_ASN_ENCODING, bCert, iCertLen);

 if(!hCert) {
  CryptMsgClose(hMsg);  
  return false;
 }

 if(!CryptMsgUpdate(hMsg, bECP, iECPLen, true)) {
  CertFreeCertificateContext(hCert);
  CryptMsgClose(hMsg);
  return false;
 }

 cib.cbData = iCertLen;
 cib.pbData = bCert;

 if(!CryptMsgControl(hMsg, 0, CMSG_CTRL_ADD_CERT, &cib)) {
  CertFreeCertificateContext(hCert);
  CryptMsgClose(hMsg); 
  return false;
 }

 iSize = 0;
 if(!CryptMsgGetParam(hMsg, CMSG_ENCODED_MESSAGE, 0, NULL, &iSize)) {
  CertFreeCertificateContext(hCert);
  CryptMsgClose(hMsg); 
  return false;
 }

 bRes = new Byte[iSize];
 if(!bRes) {
  CertFreeCertificateContext(hCert);
  CryptMsgClose(hMsg); 
  return false;
 }

 if(!CryptMsgGetParam(hMsg, CMSG_ENCODED_MESSAGE, 0, bRes, &iSize)) {
  delete [] bRes;
  CertFreeCertificateContext(hCert);
  CryptMsgClose(hMsg); 
  return false;
 }

 int hFile;
 hFile = FileCreate(ccFileName);

 if(hFile) {
  FileWrite(hFile, bRes, iSize);

  FileClose(hFile);
 }
 else {
  delete [] bRes;
  CertFreeCertificateContext(hCert);
  CryptMsgClose(hMsg); 
  return false;
 }

 delete [] bRes;
 CertFreeCertificateContext(hCert);
 CryptMsgClose(hMsg);
 return true;
}