Mercurial > dropbear
annotate libtommath/bn_mp_mod_2d.c @ 1938:77bc00dcc19f default tip main master
Bump version to 2022.82
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 01 Apr 2022 14:43:27 +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_MOD_2D_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 /* calc a value mod 2**b */ |
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7 mp_err mp_mod_2d(const mp_int *a, int b, mp_int *c) |
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8 { |
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9 int x; |
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10 mp_err err; |
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11 |
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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12 /* if b is <= 0 then zero the int */ |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
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13 if (b <= 0) { |
f52919ffd3b1
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14 mp_zero(c); |
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15 return MP_OKAY; |
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16 } |
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17 |
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18 /* if the modulus is larger than the value than return */ |
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19 if (b >= (a->used * MP_DIGIT_BIT)) { |
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20 return mp_copy(a, c); |
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21 } |
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22 |
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23 /* copy */ |
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24 if ((err = mp_copy(a, c)) != MP_OKAY) { |
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25 return err; |
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26 } |
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27 |
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28 /* zero digits above the last digit of the modulus */ |
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29 x = (b / MP_DIGIT_BIT) + (((b % MP_DIGIT_BIT) == 0) ? 0 : 1); |
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30 MP_ZERO_DIGITS(c->dp + x, c->used - x); |
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31 |
1655
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parents:
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32 /* clear the digit that is not completely outside/inside the modulus */ |
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33 c->dp[b / MP_DIGIT_BIT] &= |
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34 ((mp_digit)1 << (mp_digit)(b % MP_DIGIT_BIT)) - (mp_digit)1; |
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35 mp_clamp(c); |
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36 return MP_OKAY; |
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37 } |
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38 #endif |