Mercurial > dropbear
annotate libtommath/bn_mp_set_int.c @ 1689:d2d3b5ba6c64
update travis to Ubuntu focal to provide chacha20
author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 26 May 2020 23:13:48 +0800 |
parents | f52919ffd3b1 |
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update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
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1 #include "tommath_private.h" |
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2 #ifdef BN_MP_SET_INT_C |
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis |
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4 * |
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5 * LibTomMath is a library that provides multiple-precision |
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6 * integer arithmetic as well as number theoretic functionality. |
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7 * |
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8 * The library was designed directly after the MPI library by |
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9 * Michael Fromberger but has been written from scratch with |
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10 * additional optimizations in place. |
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11 * |
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12 * SPDX-License-Identifier: Unlicense |
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13 */ |
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14 |
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15 /* set a 32-bit const */ |
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16 int mp_set_int(mp_int *a, unsigned long b) |
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17 { |
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18 int x, res; |
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parents:
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19 |
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20 mp_zero(a); |
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21 |
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22 /* set four bits at a time */ |
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23 for (x = 0; x < 8; x++) { |
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24 /* shift the number up four bits */ |
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25 if ((res = mp_mul_2d(a, 4, a)) != MP_OKAY) { |
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26 return res; |
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27 } |
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28 |
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29 /* OR in the top four bits of the source */ |
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30 a->dp[0] |= (mp_digit)(b >> 28) & 15uL; |
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31 |
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32 /* shift the source up to the next four bits */ |
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33 b <<= 4; |
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34 |
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35 /* ensure that digits are not clamped off */ |
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36 a->used += 1; |
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37 } |
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38 mp_clamp(a); |
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39 return MP_OKAY; |
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40 } |
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41 #endif |
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42 |
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43 /* ref: HEAD -> master, tag: v1.1.0 */ |
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44 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */ |
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45 /* commit time: 2019-01-28 20:32:32 +0100 */ |