Mercurial > dropbear
view libtommath/bn_mp_montgomery_calc_normalization.c @ 1933:e093ddc5b585
Fix extra default -i arguments for multihop
When multihop executes dbclient it should only add -i arguments
from the original commandline, not the default id_dropbear key.
Otherwise multiple -i arguments keep getting added which
results in servers disconnecting with too many auth attempts
author | Matt Johnston <matt@ucc.asn.au> |
---|---|
date | Fri, 01 Apr 2022 11:56:10 +0800 |
parents | 1051e4eea25a |
children |
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#include "tommath_private.h" #ifdef BN_MP_MONTGOMERY_CALC_NORMALIZATION_C /* LibTomMath, multiple-precision integer library -- Tom St Denis */ /* SPDX-License-Identifier: Unlicense */ /* * shifts with subtractions when the result is greater than b. * * The method is slightly modified to shift B unconditionally upto just under * the leading bit of b. This saves alot of multiple precision shifting. */ mp_err mp_montgomery_calc_normalization(mp_int *a, const mp_int *b) { int x, bits; mp_err err; /* how many bits of last digit does b use */ bits = mp_count_bits(b) % MP_DIGIT_BIT; if (b->used > 1) { if ((err = mp_2expt(a, ((b->used - 1) * MP_DIGIT_BIT) + bits - 1)) != MP_OKAY) { return err; } } else { mp_set(a, 1uL); bits = 1; } /* now compute C = A * B mod b */ for (x = bits - 1; x < (int)MP_DIGIT_BIT; x++) { if ((err = mp_mul_2(a, a)) != MP_OKAY) { return err; } if (mp_cmp_mag(a, b) != MP_LT) { if ((err = s_mp_sub(a, b, a)) != MP_OKAY) { return err; } } } return MP_OKAY; } #endif