diff options
Diffstat (limited to 'third_party/heimdal/lib/hcrypto/libtommath/bn_mp_reduce_2k_setup_l.c')
-rw-r--r-- | third_party/heimdal/lib/hcrypto/libtommath/bn_mp_reduce_2k_setup_l.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/third_party/heimdal/lib/hcrypto/libtommath/bn_mp_reduce_2k_setup_l.c b/third_party/heimdal/lib/hcrypto/libtommath/bn_mp_reduce_2k_setup_l.c new file mode 100644 index 0000000..4f9aa14 --- /dev/null +++ b/third_party/heimdal/lib/hcrypto/libtommath/bn_mp_reduce_2k_setup_l.c @@ -0,0 +1,28 @@ +#include "tommath_private.h" +#ifdef BN_MP_REDUCE_2K_SETUP_L_C +/* LibTomMath, multiple-precision integer library -- Tom St Denis */ +/* SPDX-License-Identifier: Unlicense */ + +/* determines the setup value */ +mp_err mp_reduce_2k_setup_l(const mp_int *a, mp_int *d) +{ + mp_err err; + mp_int tmp; + + if ((err = mp_init(&tmp)) != MP_OKAY) { + return err; + } + + if ((err = mp_2expt(&tmp, mp_count_bits(a))) != MP_OKAY) { + goto LBL_ERR; + } + + if ((err = s_mp_sub(&tmp, a, d)) != MP_OKAY) { + goto LBL_ERR; + } + +LBL_ERR: + mp_clear(&tmp); + return err; +} +#endif |