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annotate libtommath/bn_mp_count_bits.c @ 1692:1051e4eea25a

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Update LibTomMath to 1.2.0 (#84) * update C files * update other files * update headers * update makefiles * remove mp_set/get_double() * use ltm 1.2.0 API * update ltm_desc * use bundled tommath if system-tommath is too old * XMALLOC etc. were changed to MP_MALLOC etc.
author Steffen Jaeckel <s@jaeckel.eu>
date Tue, 26 May 2020 17:36:47 +0200
parents f52919ffd3b1
children
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f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
diff changeset
1 #include "tommath_private.h"
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2 #ifdef BN_MP_COUNT_BITS_C
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1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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parents: 1655
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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parents: 1655
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4 /* SPDX-License-Identifier: Unlicense */
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6 /* returns the number of bits in an int */
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f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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7 int mp_count_bits(const mp_int *a)
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8 {
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f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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parents: 1470
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9 int r;
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parents: 1470
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10 mp_digit q;
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11
1655
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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12 /* shortcut */
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1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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parents: 1655
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13 if (MP_IS_ZERO(a)) {
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f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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14 return 0;
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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15 }
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16
1655
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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17 /* get number of digits and add that */
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1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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parents: 1655
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18 r = (a->used - 1) * MP_DIGIT_BIT;
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parents: 1470
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f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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parents: 1470
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20 /* take the last digit and count the bits in it */
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parents: 1470
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21 q = a->dp[a->used - 1];
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parents: 1655
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22 while (q > 0u) {
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parents: 1470
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23 ++r;
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parents: 1655
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24 q >>= 1u;
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parents: 1470
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25 }
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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26 return r;
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27 }
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28 #endif