Mercurial > dropbear
view libtommath/bn_mp_copy.c @ 1200:9a944a243f08 DROPBEAR_2015.71
2015.71
author | Matt Johnston <matt@ucc.asn.au> |
---|---|
date | Thu, 03 Dec 2015 21:23:54 +0800 |
parents | 5ff8218bcee9 |
children | 60fc6476e044 |
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#include <tommath.h> #ifdef BN_MP_COPY_C /* LibTomMath, multiple-precision integer library -- Tom St Denis * * LibTomMath is a library that provides multiple-precision * integer arithmetic as well as number theoretic functionality. * * The library was designed directly after the MPI library by * Michael Fromberger but has been written from scratch with * additional optimizations in place. * * The library is free for all purposes without any express * guarantee it works. * * Tom St Denis, [email protected], http://math.libtomcrypt.com */ /* copy, b = a */ int mp_copy (mp_int * a, mp_int * b) { int res, n; /* if dst == src do nothing */ if (a == b) { return MP_OKAY; } /* grow dest */ if (b->alloc < a->used) { if ((res = mp_grow (b, a->used)) != MP_OKAY) { return res; } } /* zero b and copy the parameters over */ { register mp_digit *tmpa, *tmpb; /* pointer aliases */ /* source */ tmpa = a->dp; /* destination */ tmpb = b->dp; /* copy all the digits */ for (n = 0; n < a->used; n++) { *tmpb++ = *tmpa++; } /* clear high digits */ for (; n < b->used; n++) { *tmpb++ = 0; } } /* copy used count and sign */ b->used = a->used; b->sign = a->sign; return MP_OKAY; } #endif /* $Source: /cvs/libtom/libtommath/bn_mp_copy.c,v $ */ /* $Revision: 1.3 $ */ /* $Date: 2006/03/31 14:18:44 $ */