#define MY_ENCODING_TYPE  (PKCS_7_ASN_ENCODING | X509_ASN_ENCODING)

int get_signing_time (HCRYPTMSG hMsg, int signerIndex) {
    DWORD		ret = 0;
    PCRYPT_ATTRIBUTES	authAttr = NULL;
    DWORD		authAttr_len = 0;
    DWORD		i = 0;
    PCRYPT_ATTR_BLOB	timeBlob = NULL;
    DWORD		size = 0;
    FILETIME		fileTime;
    SYSTEMTIME		systemTime;
    
    ret = CryptMsgGetParam(hMsg, CMSG_SIGNER_AUTH_ATTR_PARAM, signerIndex, NULL, &authAttr_len);
    if (ret) { printf("The attribute (CMSG_SIGNER_AUTH_ATTR_PARAM) has been acquired. Attribute size: %d\n", authAttr_len);}
    else { 
	if (GetLastError() == CRYPT_E_ATTRIBUTES_MISSING) {
	    printf("The attribute CMSG_SIGNER_AUTH_ATTR_PARAM is not included into message.\n");
	    ret = 1;
	    return ret;
	}
	else {
	   printf("Decode CMSG_SIGNER_AUTH_ATTR_PARAM failed\n");
	   return ret;
		}
    }

    // Резервируем память
    if (authAttr_len) {
	authAttr= (PCRYPT_ATTRIBUTES) malloc(authAttr_len);
	if (!authAttr){
	   printf("Decode memory allocation failed\n");
	   return ret;
		}
	// Вернем атрибут
	ret = CryptMsgGetParam(hMsg, CMSG_SIGNER_AUTH_ATTR_PARAM, signerIndex, authAttr, &authAttr_len);
	if (ret) printf("The attribute (CMSG_SIGNER_AUTH_ATTR_PARAM) returned. Length is %lu.\n", authAttr_len);
	else {
	   printf("Decode CMSG_SIGNER_AUTH_ATTR_PARAM #2 failed\n");
	   return ret;
		}
    }
    
    for (i = 0; i < authAttr->cAttr; i++) {
        if (strcmp (authAttr->rgAttr[i].pszObjId, szOID_RSA_signingTime) == 0 && authAttr->rgAttr[i].cValue ) {
	    timeBlob =(authAttr->rgAttr[i]).rgValue;

	    size = sizeof (FILETIME);
	    ret = CryptDecodeObject(MY_ENCODING_TYPE, szOID_RSA_signingTime, timeBlob->pbData, timeBlob->cbData, 0, (DWORD*) &fileTime, &size);
	    if (! ret) return ret;
	    if ( ! FileTimeToSystemTime(&fileTime, &systemTime)) return 0;

	    printf ("Signing time is: %d:%d.%d %02d-%02d-%d\n",
		systemTime.wHour, systemTime.wMinute, systemTime.wSecond,
		systemTime.wDay, systemTime.wMonth, systemTime.wYear);
	}

    }
    return ret;
}