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author | Nikos Mavrogiannopoulos <nmav@gnutls.org> | 2010-07-05 10:53:45 +0200 |
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committer | Nikos Mavrogiannopoulos <nmav@gnutls.org> | 2010-07-05 10:57:27 +0200 |
commit | 22db48330c452c35e3981f10b5bd6cc49ce59526 (patch) | |
tree | 5e90f7aa9f228adc99b2a4486a10a6691dad4830 /libtommath/bn_mp_neg.c | |
parent | aaadfeb4517b66bbd59de39173f2d032aa1d8ea9 (diff) | |
download | cryptodev-linux-22db48330c452c35e3981f10b5bd6cc49ce59526.tar.gz cryptodev-linux-22db48330c452c35e3981f10b5bd6cc49ce59526.tar.xz cryptodev-linux-22db48330c452c35e3981f10b5bd6cc49ce59526.zip |
Added libtommath for bignum operations.
Diffstat (limited to 'libtommath/bn_mp_neg.c')
-rw-r--r-- | libtommath/bn_mp_neg.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/libtommath/bn_mp_neg.c b/libtommath/bn_mp_neg.c new file mode 100644 index 0000000..a7d035a --- /dev/null +++ b/libtommath/bn_mp_neg.c @@ -0,0 +1,40 @@ +#include <tommath.h> +#ifdef BN_MP_NEG_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, tomstdenis@gmail.com, http://libtom.org + */ + +/* b = -a */ +int mp_neg (mp_int * a, mp_int * b) +{ + int res; + if (a != b) { + if ((res = mp_copy (a, b)) != MP_OKAY) { + return res; + } + } + + if (mp_iszero(b) != MP_YES) { + b->sign = (a->sign == MP_ZPOS) ? MP_NEG : MP_ZPOS; + } else { + b->sign = MP_ZPOS; + } + + return MP_OKAY; +} +#endif + +/* $Source: /cvs/libtom/libtommath/bn_mp_neg.c,v $ */ +/* $Revision: 1.4 $ */ +/* $Date: 2006/12/28 01:25:13 $ */ |