Mercurial > dropbear
view libtommath/bn_mp_to_ubin.c @ 1723:5386011b740d
Disable toom and karatsuba for new libtommath
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 18 Jun 2020 19:12:07 +0800 |
parents | 1051e4eea25a |
children |
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#include "tommath_private.h" #ifdef BN_MP_TO_UBIN_C /* LibTomMath, multiple-precision integer library -- Tom St Denis */ /* SPDX-License-Identifier: Unlicense */ /* store in unsigned [big endian] format */ mp_err mp_to_ubin(const mp_int *a, unsigned char *buf, size_t maxlen, size_t *written) { size_t x, count; mp_err err; mp_int t; count = mp_ubin_size(a); if (count > maxlen) { return MP_BUF; } if ((err = mp_init_copy(&t, a)) != MP_OKAY) { return err; } for (x = count; x --> 0u;) { #ifndef MP_8BIT buf[x] = (unsigned char)(t.dp[0] & 255u); #else buf[x] = (unsigned char)(t.dp[0] | ((t.dp[1] & 1u) << 7)); #endif if ((err = mp_div_2d(&t, 8, &t, NULL)) != MP_OKAY) { goto LBL_ERR; } } if (written != NULL) { *written = count; } LBL_ERR: mp_clear(&t); return err; } #endif