> If your problem is merely lack of entropy on a VM, then I'd recommend
> installing haveged, available in Jessie. It
> broadens the sources used by the kernel for the entropy pool.
Yes, that was the problem. I installed haveged and it worked. But it seems
that the key generation in my C++ application will not work, if a custom
passphrase
callback is set. The key generation code is unchanged, but with the callback I
get an
GPG_ERR_GENERAL error. The init and callback code is as follows:
// Initializes gpgme
gpgme_check_version(NULL);
// Initialize the locale environment.
setlocale(LC_ALL, "");
gpgme_set_locale(NULL, LC_CTYPE, setlocale(LC_CTYPE, NULL));
#ifdef LC_MESSAGES
gpgme_set_locale(NULL, LC_MESSAGES, setlocale(LC_MESSAGES, NULL));
#endif
gpgme_error_t error = gpgme_new(&mContext);
if(error)
return false;
// Check OpenPGP
error = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
if(error)
return false;
// load engine info
error = gpgme_get_engine_info(&info);
if(error)
return false;
while(info && info->protocol != gpgme_get_protocol(mContext)) {
info = info->next;
}
//callback for user passphrase
gpgme_set_passphrase_cb(mContext, passphrase_cb, NULL);
And the callback (similar to gpgme++):
-----------------------------
static gpgme_error_t passphrase_cb(void *hook, const char *uid_hint, const char
*passphrase_info,
int prev_was_bad, int fd){
std::string passphraseString;
std::cout<< "Enter your password:";
std::cin >> passphraseString;
if(passphraseString.empty()){
return GPG_ERR_CANCELED;
}
size_t passphraseLength = passphraseString.size();
char* passphrase = new char[passphraseLength + 1];
std::copy(passphraseString.begin(), passphraseString.end(), passphrase);
size_t written = 0;
do {
size_t nowWritten = gpgme_io_write(fd, passphrase + written,
passphraseLength - written);
if(nowWritten < 0) {
break;
}
written += nowWritten;
} while(written < passphraseLength);
free(passphrase);
gpgme_io_write(fd, "\n", 1);
return 0;
}
--------------------------
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