Mercurial > dropbear
annotate libtommath/bn_mp_reduce_is_2k.c @ 1782:a6da10ac64b5 fuzz
fuzz: make postauth set authdone properly
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 03 Dec 2020 22:18:51 +0800 |
parents | 1051e4eea25a |
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1 #include "tommath_private.h" |
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2 #ifdef BN_MP_REDUCE_IS_2K_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 /* determines if mp_reduce_2k can be used */ |
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7 mp_bool mp_reduce_is_2k(const mp_int *a) |
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8 { |
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9 int ix, iy, iw; |
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10 mp_digit iz; |
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11 |
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12 if (a->used == 0) { |
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13 return MP_NO; |
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14 } else if (a->used == 1) { |
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15 return MP_YES; |
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16 } else if (a->used > 1) { |
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17 iy = mp_count_bits(a); |
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18 iz = 1; |
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19 iw = 1; |
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20 |
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21 /* Test every bit from the second digit up, must be 1 */ |
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22 for (ix = MP_DIGIT_BIT; ix < iy; ix++) { |
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23 if ((a->dp[iw] & iz) == 0u) { |
f52919ffd3b1
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parents:
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24 return MP_NO; |
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
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25 } |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
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26 iz <<= 1; |
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27 if (iz > MP_DIGIT_MAX) { |
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parents:
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28 ++iw; |
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parents:
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29 iz = 1; |
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parents:
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30 } |
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31 } |
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32 return MP_YES; |
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33 } else { |
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34 return MP_YES; |
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35 } |
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36 } |
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37 |
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38 #endif |