Mercurial > dropbear
view libtommath/bn_mp_mul_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_MUL_2D_C /* LibTomMath, multiple-precision integer library -- Tom St Denis */ /* SPDX-License-Identifier: Unlicense */ /* shift left by a certain bit count */ mp_err mp_mul_2d(const mp_int *a, int b, mp_int *c) { mp_digit d; mp_err err; /* copy */ if (a != c) { if ((err = mp_copy(a, c)) != MP_OKAY) { return err; } } if (c->alloc < (c->used + (b / MP_DIGIT_BIT) + 1)) { if ((err = mp_grow(c, c->used + (b / MP_DIGIT_BIT) + 1)) != MP_OKAY) { return err; } } /* shift by as many digits in the bit count */ if (b >= MP_DIGIT_BIT) { if ((err = mp_lshd(c, b / MP_DIGIT_BIT)) != MP_OKAY) { return err; } } /* shift any bit count < MP_DIGIT_BIT */ d = (mp_digit)(b % MP_DIGIT_BIT); if (d != 0u) { mp_digit *tmpc, shift, mask, r, rr; int x; /* bitmask for carries */ mask = ((mp_digit)1 << d) - (mp_digit)1; /* shift for msbs */ shift = (mp_digit)MP_DIGIT_BIT - d; /* alias */ tmpc = c->dp; /* carry */ r = 0; for (x = 0; x < c->used; x++) { /* get the higher bits of the current word */ rr = (*tmpc >> shift) & mask; /* shift the current word and OR in the carry */ *tmpc = ((*tmpc << d) | r) & MP_MASK; ++tmpc; /* set the carry to the carry bits of the current word */ r = rr; } /* set final carry */ if (r != 0u) { c->dp[(c->used)++] = r; } } mp_clamp(c); return MP_OKAY; } #endif