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1 /* LibTomMath, multiple-precision integer library -- Tom St Denis |
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2 * |
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3 * LibTomMath is a library that provides multiple-precision |
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4 * integer arithmetic as well as number theoretic functionality. |
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5 * |
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6 * The library was designed directly after the MPI library by |
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7 * Michael Fromberger but has been written from scratch with |
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8 * additional optimizations in place. |
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9 * |
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10 * The library is free for all purposes without any express |
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11 * guarantee it works. |
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12 * |
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13 * Tom St Denis, [email protected], http://math.libtomcrypt.org |
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14 */ |
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15 #include <tommath.h> |
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16 |
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17 /* determines the setup value */ |
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18 void mp_dr_setup(mp_int *a, mp_digit *d) |
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19 { |
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20 /* the casts are required if DIGIT_BIT is one less than |
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21 * the number of bits in a mp_digit [e.g. DIGIT_BIT==31] |
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22 */ |
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23 *d = (mp_digit)((((mp_word)1) << ((mp_word)DIGIT_BIT)) - |
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24 ((mp_word)a->dp[0])); |
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25 } |
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26 |
