Mercurial > dropbear
annotate libtommath/bn_mp_get_long_long.c @ 1499:2d450c1056e3
options: Complete the transition to numeric toggles (`#if')
For the sake of review, this commit alters only the code; the affiliated
comments within the source files also need to be updated, but doing so
now would obscure the operational changes that have been made here.
* All on/off options have been switched to the numeric `#if' variant;
that is the only way to make this `default_options.h.in' thing work
in a reasonable manner.
* There is now some very minor compile-time checking of the user's
choice of options.
* NO_FAST_EXPTMOD doesn't seem to be used, so it has been removed.
* ENABLE_USER_ALGO_LIST was supposed to be renamed DROPBEAR_USER_ALGO_LIST,
and this commit completes that work.
* DROPBEAR_FUZZ seems to be a relatively new, as-yet undocumented option,
which was added by the following commit:
commit 6e0b539e9ca0b5628c6c5a3d118ad6a2e79e8039
Author: Matt Johnston <[email protected]>
Date: Tue May 23 22:29:21 2017 +0800
split out checkpubkey_line() separately
It has now been added to `sysoptions.h' and defined as `0' by default.
* The configuration option `DROPBEAR_PASSWORD_ENV' is no longer listed in
`default_options.h.in'; it is no longer meant to be set by the user, and
is instead left to be defined in `sysoptions.h' (where it was already being
defined) as merely the name of the environment variable in question:
DROPBEAR_PASSWORD
To enable or disable use of that environment variable, the user must now
toggle `DROPBEAR_USE_DROPBEAR_PASSWORD'.
* The sFTP support is now toggled by setting `DROPBEAR_SFTPSERVER', and the
path of the sFTP server program is set independently through the usual
SFTPSERVER_PATH.
| author | Michael Witten <mfwitten@gmail.com> |
|---|---|
| date | Thu, 20 Jul 2017 19:38:26 +0000 |
| parents | 60fc6476e044 |
| children | f52919ffd3b1 |
| rev | line source |
|---|---|
| 1436 | 1 #include <tommath_private.h> |
| 2 #ifdef BN_MP_GET_LONG_LONG_C | |
| 3 /* LibTomMath, multiple-precision integer library -- Tom St Denis | |
| 4 * | |
| 5 * LibTomMath is a library that provides multiple-precision | |
| 6 * integer arithmetic as well as number theoretic functionality. | |
| 7 * | |
| 8 * The library was designed directly after the MPI library by | |
| 9 * Michael Fromberger but has been written from scratch with | |
| 10 * additional optimizations in place. | |
| 11 * | |
| 12 * The library is free for all purposes without any express | |
| 13 * guarantee it works. | |
| 14 * | |
| 15 * Tom St Denis, [email protected], http://libtom.org | |
| 16 */ | |
| 17 | |
| 18 /* get the lower unsigned long long of an mp_int, platform dependent */ | |
| 19 unsigned long long mp_get_long_long (mp_int * a) | |
| 20 { | |
| 21 int i; | |
| 22 unsigned long long res; | |
| 23 | |
| 24 if (a->used == 0) { | |
| 25 return 0; | |
| 26 } | |
| 27 | |
| 28 /* get number of digits of the lsb we have to read */ | |
| 29 i = MIN(a->used,(int)(((sizeof(unsigned long long) * CHAR_BIT) + DIGIT_BIT - 1) / DIGIT_BIT)) - 1; | |
| 30 | |
| 31 /* get most significant digit of result */ | |
| 32 res = DIGIT(a,i); | |
| 33 | |
| 34 #if DIGIT_BIT < 64 | |
| 35 while (--i >= 0) { | |
| 36 res = (res << DIGIT_BIT) | DIGIT(a,i); | |
| 37 } | |
| 38 #endif | |
| 39 return res; | |
| 40 } | |
| 41 #endif |