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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 /* compare a digit */ |
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18 int mp_cmp_d(mp_int * a, mp_digit b) |
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19 { |
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20 /* compare based on sign */ |
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21 if (a->sign == MP_NEG) { |
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22 return MP_LT; |
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23 } |
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24 |
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25 /* compare based on magnitude */ |
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26 if (a->used > 1) { |
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27 return MP_GT; |
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28 } |
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29 |
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30 /* compare the only digit of a to b */ |
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31 if (a->dp[0] > b) { |
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32 return MP_GT; |
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33 } else if (a->dp[0] < b) { |
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34 return MP_LT; |
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35 } else { |
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36 return MP_EQ; |
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37 } |
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38 } |
