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annotate libtommath/bn_mp_dr_setup.c @ 284:eed26cff980b

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propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583) to branch 'au.asn.ucc.matt.dropbear' (head fff0894a0399405a9410ea1c6d118f342cf2aa64)
author Matt Johnston <matt@ucc.asn.au>
date Wed, 08 Mar 2006 13:23:49 +0000
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children 5ff8218bcee9
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284
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1 #include <tommath.h>
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2 #ifdef BN_MP_DR_SETUP_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
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4 *
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5 * LibTomMath is a library that provides multiple-precision
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6 * integer arithmetic as well as number theoretic functionality.
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7 *
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8 * The library was designed directly after the MPI library by
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9 * Michael Fromberger but has been written from scratch with
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10 * additional optimizations in place.
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11 *
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12 * The library is free for all purposes without any express
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13 * guarantee it works.
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14 *
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15 * Tom St Denis, [email protected], http://math.libtomcrypt.org
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16 */
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17
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18 /* determines the setup value */
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19 void mp_dr_setup(mp_int *a, mp_digit *d)
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20 {
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21 /* the casts are required if DIGIT_BIT is one less than
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22 * the number of bits in a mp_digit [e.g. DIGIT_BIT==31]
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23 */
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24 *d = (mp_digit)((((mp_word)1) << ((mp_word)DIGIT_BIT)) -
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25 ((mp_word)a->dp[0]));
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26 }
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28 #endif