Mercurial > dropbear
annotate libtommath/bn_mp_reduce_2k_setup.c @ 1723:5386011b740d
Disable toom and karatsuba for new libtommath
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 18 Jun 2020 19:12:07 +0800 |
parents | 1051e4eea25a |
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update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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1 #include "tommath_private.h" |
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2 #ifdef BN_MP_REDUCE_2K_SETUP_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 the setup value */ |
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7 mp_err mp_reduce_2k_setup(const mp_int *a, mp_digit *d) |
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8 { |
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9 mp_err err; |
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10 mp_int tmp; |
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11 int p; |
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12 |
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13 if ((err = mp_init(&tmp)) != MP_OKAY) { |
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14 return err; |
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15 } |
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16 |
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17 p = mp_count_bits(a); |
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18 if ((err = mp_2expt(&tmp, p)) != MP_OKAY) { |
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19 mp_clear(&tmp); |
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20 return err; |
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21 } |
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22 |
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23 if ((err = s_mp_sub(&tmp, a, &tmp)) != MP_OKAY) { |
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24 mp_clear(&tmp); |
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25 return err; |
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26 } |
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27 |
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28 *d = tmp.dp[0]; |
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29 mp_clear(&tmp); |
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30 return MP_OKAY; |
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31 } |
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32 #endif |