diff options
Diffstat (limited to '')
| -rw-r--r-- | third_party/heimdal/lib/hcrypto/libtommath/bn_mp_reduce_setup.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/third_party/heimdal/lib/hcrypto/libtommath/bn_mp_reduce_setup.c b/third_party/heimdal/lib/hcrypto/libtommath/bn_mp_reduce_setup.c new file mode 100644 index 0000000..f02160f --- /dev/null +++ b/third_party/heimdal/lib/hcrypto/libtommath/bn_mp_reduce_setup.c @@ -0,0 +1,17 @@ +#include "tommath_private.h" +#ifdef BN_MP_REDUCE_SETUP_C +/* LibTomMath, multiple-precision integer library -- Tom St Denis */ +/* SPDX-License-Identifier: Unlicense */ + +/* pre-calculate the value required for Barrett reduction + * For a given modulus "b" it calulates the value required in "a" + */ +mp_err mp_reduce_setup(mp_int *a, const mp_int *b) +{ + mp_err err; + if ((err = mp_2expt(a, b->used * 2 * MP_DIGIT_BIT)) != MP_OKAY) { + return err; + } + return mp_div(a, b, a, NULL); +} +#endif |