Mercurial > dropbear
view libtommath/bn_mp_mod_2d.c @ 1921:284c3837891c
Allow user space file locations (rootless support)
Why:
Running dropbear as a user (rootless) is aided if
files and programs can be saved/removed without
needing sudo.
What:
Use the same convention as DROPBEAR_DEFAULT_CLI_AUTHKEY;
if not starting with '/', then is relative to hedge's /home/hedge:
*_PRIV_FILENAME
DROPBEAR_PIDFILE
SFTPSERVER_PATH
default_options.h commentary added.
Changes kept to a minimum, so log entry in svr_kex.c#163
is refactored.
From:
Generated hostkey is <path> ... <finger-print>
to:
Generated hostkey path is <path>
Generated hostkey fingerprint is <fp>
Otherwise the unexpanded path was reported.
Patch modified by Matt Johnston
Signed-off-by: Begley Brothers Inc <[email protected]>
author | Begley Brothers Inc <begleybrothers@gmail.com> |
---|---|
date | Thu, 09 Jul 2020 17:47:58 +1000 |
parents | 1051e4eea25a |
children |
line wrap: on
line source
#include "tommath_private.h" #ifdef BN_MP_MOD_2D_C /* LibTomMath, multiple-precision integer library -- Tom St Denis */ /* SPDX-License-Identifier: Unlicense */ /* calc a value mod 2**b */ mp_err mp_mod_2d(const mp_int *a, int b, mp_int *c) { int x; mp_err err; /* if b is <= 0 then zero the int */ if (b <= 0) { mp_zero(c); return MP_OKAY; } /* if the modulus is larger than the value than return */ if (b >= (a->used * MP_DIGIT_BIT)) { return mp_copy(a, c); } /* copy */ if ((err = mp_copy(a, c)) != MP_OKAY) { return err; } /* zero digits above the last digit of the modulus */ x = (b / MP_DIGIT_BIT) + (((b % MP_DIGIT_BIT) == 0) ? 0 : 1); MP_ZERO_DIGITS(c->dp + x, c->used - x); /* clear the digit that is not completely outside/inside the modulus */ c->dp[b / MP_DIGIT_BIT] &= ((mp_digit)1 << (mp_digit)(b % MP_DIGIT_BIT)) - (mp_digit)1; mp_clamp(c); return MP_OKAY; } #endif