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view libtommath/bn_mp_addmod.c @ 1907:3e0aacf0a4f3

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Fix ed25519 dropbear to openssh conversion This introduces buf_put_ed25519_priv_ossh and buf_get_ed25519_priv_ossh to handle OpenSSH internal private key format. Previously writing OpenSSH format keys didn't write the private part correctly.
author Matt Johnston <matt@ucc.asn.au>
date Tue, 29 Mar 2022 16:46:06 +0800
parents 1051e4eea25a
children
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#include "tommath_private.h"
#ifdef BN_MP_ADDMOD_C
/* LibTomMath, multiple-precision integer library -- Tom St Denis */
/* SPDX-License-Identifier: Unlicense */

/* d = a + b (mod c) */
mp_err mp_addmod(const mp_int *a, const mp_int *b, const mp_int *c, mp_int *d)
{
   mp_err  err;
   mp_int  t;

   if ((err = mp_init(&t)) != MP_OKAY) {
      return err;
   }

   if ((err = mp_add(a, b, &t)) != MP_OKAY) {
      goto LBL_ERR;
   }
   err = mp_mod(&t, c, d);

LBL_ERR:
   mp_clear(&t);
   return err;
}
#endif