Mercurial > dropbear
view libtommath/bn_mp_xor.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_XOR_C /* LibTomMath, multiple-precision integer library -- Tom St Denis */ /* SPDX-License-Identifier: Unlicense */ /* two complement xor */ mp_err mp_xor(const mp_int *a, const mp_int *b, mp_int *c) { int used = MP_MAX(a->used, b->used) + 1, i; mp_err err; mp_digit ac = 1, bc = 1, cc = 1; mp_sign csign = (a->sign != b->sign) ? MP_NEG : MP_ZPOS; if (c->alloc < used) { if ((err = mp_grow(c, used)) != MP_OKAY) { return err; } } for (i = 0; i < used; i++) { mp_digit x, y; /* convert to two complement if negative */ if (a->sign == MP_NEG) { ac += (i >= a->used) ? MP_MASK : (~a->dp[i] & MP_MASK); x = ac & MP_MASK; ac >>= MP_DIGIT_BIT; } else { x = (i >= a->used) ? 0uL : a->dp[i]; } /* convert to two complement if negative */ if (b->sign == MP_NEG) { bc += (i >= b->used) ? MP_MASK : (~b->dp[i] & MP_MASK); y = bc & MP_MASK; bc >>= MP_DIGIT_BIT; } else { y = (i >= b->used) ? 0uL : b->dp[i]; } c->dp[i] = x ^ y; /* convert to to sign-magnitude if negative */ if (csign == MP_NEG) { cc += ~c->dp[i] & MP_MASK; c->dp[i] = cc & MP_MASK; cc >>= MP_DIGIT_BIT; } } c->used = used; c->sign = csign; mp_clamp(c); return MP_OKAY; } #endif