Mercurial > dropbear
annotate libtommath/bn_mp_cnt_lsb.c @ 1802:19b28d2fbe30
fuzz: handle errors from wrapfd_new_dummy()
author | Matt Johnston <matt@ucc.asn.au> |
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date | Sat, 06 Mar 2021 22:58:57 +0800 |
parents | 1051e4eea25a |
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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_CNT_LSB_C |
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */ |
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4 /* SPDX-License-Identifier: Unlicense */ |
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5 |
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6 static const int lnz[16] = { |
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7 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0 |
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8 }; |
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9 |
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10 /* Counts the number of lsbs which are zero before the first zero bit */ |
1655
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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>
parents:
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11 int mp_cnt_lsb(const mp_int *a) |
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12 { |
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13 int x; |
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14 mp_digit q, qq; |
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15 |
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16 /* easy out */ |
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17 if (MP_IS_ZERO(a)) { |
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18 return 0; |
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19 } |
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20 |
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21 /* scan lower digits until non-zero */ |
1655
f52919ffd3b1
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parents:
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22 for (x = 0; (x < a->used) && (a->dp[x] == 0u); x++) {} |
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23 q = a->dp[x]; |
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24 x *= MP_DIGIT_BIT; |
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25 |
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26 /* now scan this digit until a 1 is found */ |
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27 if ((q & 1u) == 0u) { |
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28 do { |
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29 qq = q & 15u; |
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30 x += lnz[qq]; |
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31 q >>= 4; |
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update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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parents:
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32 } while (qq == 0u); |
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33 } |
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34 return x; |
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35 } |
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36 |
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37 #endif |