|
142
|
1 #include <tommath.h> |
|
|
2 #ifdef BN_MP_CMP_D_C |
|
2
|
3 /* LibTomMath, multiple-precision integer library -- Tom St Denis |
|
|
4 * |
|
|
5 * LibTomMath is a library that provides multiple-precision |
|
|
6 * integer arithmetic as well as number theoretic functionality. |
|
|
7 * |
|
|
8 * The library was designed directly after the MPI library by |
|
|
9 * Michael Fromberger but has been written from scratch with |
|
|
10 * additional optimizations in place. |
|
|
11 * |
|
|
12 * The library is free for all purposes without any express |
|
|
13 * guarantee it works. |
|
|
14 * |
|
|
15 * Tom St Denis, [email protected], http://math.libtomcrypt.org |
|
|
16 */ |
|
|
17 |
|
|
18 /* compare a digit */ |
|
|
19 int mp_cmp_d(mp_int * a, mp_digit b) |
|
|
20 { |
|
|
21 /* compare based on sign */ |
|
|
22 if (a->sign == MP_NEG) { |
|
|
23 return MP_LT; |
|
|
24 } |
|
|
25 |
|
|
26 /* compare based on magnitude */ |
|
|
27 if (a->used > 1) { |
|
|
28 return MP_GT; |
|
|
29 } |
|
|
30 |
|
|
31 /* compare the only digit of a to b */ |
|
|
32 if (a->dp[0] > b) { |
|
|
33 return MP_GT; |
|
|
34 } else if (a->dp[0] < b) { |
|
|
35 return MP_LT; |
|
|
36 } else { |
|
|
37 return MP_EQ; |
|
|
38 } |
|
|
39 } |
|
142
|
40 #endif |
