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view libtommath/bn_mp_dr_is_modulus.c @ 1922:70f05f7d4d11
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Signed-off-by: Begley Brothers Inc <[email protected]>
author | Begley Brothers Inc <begleybrothers@gmail.com> |
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date | Thu, 09 Jul 2020 17:51:07 +1000 |
parents | 1051e4eea25a |
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#include "tommath_private.h" #ifdef BN_MP_DR_IS_MODULUS_C /* LibTomMath, multiple-precision integer library -- Tom St Denis */ /* SPDX-License-Identifier: Unlicense */ /* determines if a number is a valid DR modulus */ mp_bool mp_dr_is_modulus(const mp_int *a) { int ix; /* must be at least two digits */ if (a->used < 2) { return MP_NO; } /* must be of the form b**k - a [a <= b] so all * but the first digit must be equal to -1 (mod b). */ for (ix = 1; ix < a->used; ix++) { if (a->dp[ix] != MP_MASK) { return MP_NO; } } return MP_YES; } #endif