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author | jan.nijtmans <nijtmans@users.sourceforge.net> | 2019-10-07 11:37:36 (GMT) |
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committer | jan.nijtmans <nijtmans@users.sourceforge.net> | 2019-10-07 11:37:36 (GMT) |
commit | 1e29c4f4ad0ec8903b99967d45b6ea0ea76c6111 (patch) | |
tree | 2312b71d74326ff86bcbd4acecb0f10a1c0ad63c /libtommath/bn_mp_to_ubin.c | |
parent | 1cb1fee6edc063cb49beb0188c2a3db4771846fa (diff) | |
download | tcl-1e29c4f4ad0ec8903b99967d45b6ea0ea76c6111.zip tcl-1e29c4f4ad0ec8903b99967d45b6ea0ea76c6111.tar.gz tcl-1e29c4f4ad0ec8903b99967d45b6ea0ea76c6111.tar.bz2 |
Update to latest "develop" branch
Diffstat (limited to 'libtommath/bn_mp_to_ubin.c')
-rw-r--r-- | libtommath/bn_mp_to_ubin.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/libtommath/bn_mp_to_ubin.c b/libtommath/bn_mp_to_ubin.c new file mode 100644 index 0000000..d359986 --- /dev/null +++ b/libtommath/bn_mp_to_ubin.c @@ -0,0 +1,50 @@ +#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; + mp_err err; + mp_int t; + + if (buf == NULL) { + return MP_MEM; + } + + if (maxlen == 0u) { + return MP_VAL; + } + + if ((err = mp_init_copy(&t, a)) != MP_OKAY) { + return err; + } + + x = 0u; + while (!MP_IS_ZERO(&t)) { + if (maxlen == 0u) { + err = MP_VAL; + goto LBL_ERR; + } + maxlen--; +#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; + } + } + s_mp_reverse(buf, x); + + if (written != NULL) { + *written = x; + } +LBL_ERR: + mp_clear(&t); + return err; +} +#endif |