Mercurial > dropbear
comparison libtommath/bn_mp_to_ubin.c @ 1739:13d834efc376 fuzz
merge from main
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 15 Oct 2020 19:55:15 +0800 |
parents | 1051e4eea25a |
children |
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1562:768ebf737aa0 | 1739:13d834efc376 |
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1 #include "tommath_private.h" | |
2 #ifdef BN_MP_TO_UBIN_C | |
3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */ | |
4 /* SPDX-License-Identifier: Unlicense */ | |
5 | |
6 /* store in unsigned [big endian] format */ | |
7 mp_err mp_to_ubin(const mp_int *a, unsigned char *buf, size_t maxlen, size_t *written) | |
8 { | |
9 size_t x, count; | |
10 mp_err err; | |
11 mp_int t; | |
12 | |
13 count = mp_ubin_size(a); | |
14 if (count > maxlen) { | |
15 return MP_BUF; | |
16 } | |
17 | |
18 if ((err = mp_init_copy(&t, a)) != MP_OKAY) { | |
19 return err; | |
20 } | |
21 | |
22 for (x = count; x --> 0u;) { | |
23 #ifndef MP_8BIT | |
24 buf[x] = (unsigned char)(t.dp[0] & 255u); | |
25 #else | |
26 buf[x] = (unsigned char)(t.dp[0] | ((t.dp[1] & 1u) << 7)); | |
27 #endif | |
28 if ((err = mp_div_2d(&t, 8, &t, NULL)) != MP_OKAY) { | |
29 goto LBL_ERR; | |
30 } | |
31 } | |
32 | |
33 if (written != NULL) { | |
34 *written = count; | |
35 } | |
36 | |
37 LBL_ERR: | |
38 mp_clear(&t); | |
39 return err; | |
40 } | |
41 #endif |