Mercurial > dropbear
annotate libtommath/bn_mp_2expt.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)
Steffen Jaeckel <s_jaeckel@gmx.de>
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1 #include "tommath_private.h" |
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2 #ifdef BN_MP_2EXPT_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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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
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6 /* computes a = 2**b |
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7 * |
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8 * Simple algorithm which zeroes the int, grows it then just sets one bit |
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9 * as required. |
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10 */ |
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11 mp_err mp_2expt(mp_int *a, int b) |
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12 { |
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13 mp_err err; |
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14 |
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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15 /* zero a as per default */ |
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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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16 mp_zero(a); |
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17 |
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
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18 /* grow a to accomodate the single bit */ |
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19 if ((err = mp_grow(a, (b / MP_DIGIT_BIT) + 1)) != MP_OKAY) { |
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20 return err; |
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parents:
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21 } |
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22 |
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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23 /* set the used count of where the bit will go */ |
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24 a->used = (b / MP_DIGIT_BIT) + 1; |
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25 |
1655
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
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26 /* put the single bit in its place */ |
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27 a->dp[b / MP_DIGIT_BIT] = (mp_digit)1 << (mp_digit)(b % MP_DIGIT_BIT); |
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28 |
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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29 return MP_OKAY; |
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30 } |
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31 #endif |