Mercurial > dropbear
view libtommath/bn_mp_mul_d.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_MUL_D_C /* LibTomMath, multiple-precision integer library -- Tom St Denis */ /* SPDX-License-Identifier: Unlicense */ /* multiply by a digit */ mp_err mp_mul_d(const mp_int *a, mp_digit b, mp_int *c) { mp_digit u, *tmpa, *tmpc; mp_word r; mp_err err; int ix, olduse; /* make sure c is big enough to hold a*b */ if (c->alloc < (a->used + 1)) { if ((err = mp_grow(c, a->used + 1)) != MP_OKAY) { return err; } } /* get the original destinations used count */ olduse = c->used; /* set the sign */ c->sign = a->sign; /* alias for a->dp [source] */ tmpa = a->dp; /* alias for c->dp [dest] */ tmpc = c->dp; /* zero carry */ u = 0; /* compute columns */ for (ix = 0; ix < a->used; ix++) { /* compute product and carry sum for this term */ r = (mp_word)u + ((mp_word)*tmpa++ * (mp_word)b); /* mask off higher bits to get a single digit */ *tmpc++ = (mp_digit)(r & (mp_word)MP_MASK); /* send carry into next iteration */ u = (mp_digit)(r >> (mp_word)MP_DIGIT_BIT); } /* store final carry [if any] and increment ix offset */ *tmpc++ = u; ++ix; /* now zero digits above the top */ MP_ZERO_DIGITS(tmpc, olduse - ix); /* set used count */ c->used = a->used + 1; mp_clamp(c); return MP_OKAY; } #endif