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[25] | 1 | #include <tommath.h> |
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| 2 | #ifdef BN_MP_CMP_MAG_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, tomstdenis@gmail.com, http://math.libtomcrypt.com |
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| 16 | */ |
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| 17 | |
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| 18 | /* compare maginitude of two ints (unsigned) */ |
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| 19 | int mp_cmp_mag (mp_int * a, mp_int * b) |
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| 20 | { |
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| 21 | int n; |
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| 22 | mp_digit *tmpa, *tmpb; |
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| 23 | |
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| 24 | /* compare based on # of non-zero digits */ |
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| 25 | if (a->used > b->used) { |
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| 26 | return MP_GT; |
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| 27 | } |
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| 28 | |
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| 29 | if (a->used < b->used) { |
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| 30 | return MP_LT; |
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| 31 | } |
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| 32 | |
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| 33 | /* alias for a */ |
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| 34 | tmpa = a->dp + (a->used - 1); |
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| 35 | |
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| 36 | /* alias for b */ |
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| 37 | tmpb = b->dp + (a->used - 1); |
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| 38 | |
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| 39 | /* compare based on digits */ |
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| 40 | for (n = 0; n < a->used; ++n, --tmpa, --tmpb) { |
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| 41 | if (*tmpa > *tmpb) { |
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| 42 | return MP_GT; |
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| 43 | } |
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| 44 | |
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| 45 | if (*tmpa < *tmpb) { |
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| 46 | return MP_LT; |
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| 47 | } |
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| 48 | } |
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| 49 | return MP_EQ; |
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| 50 | } |
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| 51 | #endif |
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| 52 | |
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| 53 | /* $Source: /cvsroot/tcl/libtommath/bn_mp_cmp_mag.c,v $ */ |
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| 54 | /* $Revision: 1.1.1.3 $ */ |
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| 55 | /* $Date: 2006/12/01 00:08:11 $ */ |
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