diff options
Diffstat (limited to 'third_party/heimdal/lib/hcrypto/libtommath/bn_mp_neg.c')
-rw-r--r-- | third_party/heimdal/lib/hcrypto/libtommath/bn_mp_neg.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/third_party/heimdal/lib/hcrypto/libtommath/bn_mp_neg.c b/third_party/heimdal/lib/hcrypto/libtommath/bn_mp_neg.c new file mode 100644 index 0000000..264d900 --- /dev/null +++ b/third_party/heimdal/lib/hcrypto/libtommath/bn_mp_neg.c @@ -0,0 +1,24 @@ +#include "tommath_private.h" +#ifdef BN_MP_NEG_C +/* LibTomMath, multiple-precision integer library -- Tom St Denis */ +/* SPDX-License-Identifier: Unlicense */ + +/* b = -a */ +mp_err mp_neg(const mp_int *a, mp_int *b) +{ + mp_err err; + if (a != b) { + if ((err = mp_copy(a, b)) != MP_OKAY) { + return err; + } + } + + if (!MP_IS_ZERO(b)) { + b->sign = (a->sign == MP_ZPOS) ? MP_NEG : MP_ZPOS; + } else { + b->sign = MP_ZPOS; + } + + return MP_OKAY; +} +#endif |