LCOV - code coverage report
Current view: top level - source4/heimdal/lib/hcrypto/libtommath - bn_mp_dr_is_modulus.c (source / functions) Hit Total Coverage
Test: coverage report for abartlet/fix-coverage dd10fb34 Lines: 5 7 71.4 %
Date: 2021-09-23 10:06:22 Functions: 1 1 100.0 %

          Line data    Source code
       1             : #include <tommath.h>
       2             : #ifdef BN_MP_DR_IS_MODULUS_C
       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, tomstdenis@gmail.com, http://libtom.org
      16             :  */
      17             : 
      18             : /* determines if a number is a valid DR modulus */
      19         872 : int mp_dr_is_modulus(mp_int *a)
      20             : {
      21             :    int ix;
      22             : 
      23             :    /* must be at least two digits */
      24         872 :    if (a->used < 2) {
      25           0 :       return 0;
      26             :    }
      27             : 
      28             :    /* must be of the form b**k - a [a <= b] so all
      29             :     * but the first digit must be equal to -1 (mod b).
      30             :     */
      31         840 :    for (ix = 1; ix < a->used; ix++) {
      32         872 :        if (a->dp[ix] != MP_MASK) {
      33         840 :           return 0;
      34             :        }
      35             :    }
      36           0 :    return 1;
      37             : }
      38             : 
      39             : #endif
      40             : 
      41             : /* $Source: /cvs/libtom/libtommath/bn_mp_dr_is_modulus.c,v $ */
      42             : /* $Revision: 1.4 $ */
      43             : /* $Date: 2006/12/28 01:25:13 $ */

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