Mercurial > dropbear
view libtommath/bn_mp_pack.c @ 1777:97ad26e397a5
Add server postauth fuzzer, wrap connect_remote()
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 13 Nov 2020 23:18:05 +0800 |
parents | 1051e4eea25a |
children |
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#include "tommath_private.h" #ifdef BN_MP_PACK_C /* LibTomMath, multiple-precision integer library -- Tom St Denis */ /* SPDX-License-Identifier: Unlicense */ /* based on gmp's mpz_export. * see http://gmplib.org/manual/Integer-Import-and-Export.html */ mp_err mp_pack(void *rop, size_t maxcount, size_t *written, mp_order order, size_t size, mp_endian endian, size_t nails, const mp_int *op) { mp_err err; size_t odd_nails, nail_bytes, i, j, count; unsigned char odd_nail_mask; mp_int t; count = mp_pack_count(op, nails, size); if (count > maxcount) { return MP_BUF; } if ((err = mp_init_copy(&t, op)) != MP_OKAY) { return err; } if (endian == MP_NATIVE_ENDIAN) { MP_GET_ENDIANNESS(endian); } odd_nails = (nails % 8u); odd_nail_mask = 0xff; for (i = 0u; i < odd_nails; ++i) { odd_nail_mask ^= (unsigned char)(1u << (7u - i)); } nail_bytes = nails / 8u; for (i = 0u; i < count; ++i) { for (j = 0u; j < size; ++j) { unsigned char *byte = (unsigned char *)rop + (((order == MP_LSB_FIRST) ? i : ((count - 1u) - i)) * size) + ((endian == MP_LITTLE_ENDIAN) ? j : ((size - 1u) - j)); if (j >= (size - nail_bytes)) { *byte = 0; continue; } *byte = (unsigned char)((j == ((size - nail_bytes) - 1u)) ? (t.dp[0] & odd_nail_mask) : (t.dp[0] & 0xFFuL)); if ((err = mp_div_2d(&t, (j == ((size - nail_bytes) - 1u)) ? (int)(8u - odd_nails) : 8, &t, NULL)) != MP_OKAY) { goto LBL_ERR; } } } if (written != NULL) { *written = count; } err = MP_OKAY; LBL_ERR: mp_clear(&t); return err; } #endif