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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 17:20:00 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 17:20:00 +0000 |
commit | 8daa83a594a2e98f39d764422bfbdbc62c9efd44 (patch) | |
tree | 4099e8021376c7d8c05bdf8503093d80e9c7bad0 /third_party/heimdal/lib/hcrypto/libtommath/bn_mp_reduce_2k_setup.c | |
parent | Initial commit. (diff) | |
download | samba-8daa83a594a2e98f39d764422bfbdbc62c9efd44.tar.xz samba-8daa83a594a2e98f39d764422bfbdbc62c9efd44.zip |
Adding upstream version 2:4.20.0+dfsg.upstream/2%4.20.0+dfsg
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'third_party/heimdal/lib/hcrypto/libtommath/bn_mp_reduce_2k_setup.c')
-rw-r--r-- | third_party/heimdal/lib/hcrypto/libtommath/bn_mp_reduce_2k_setup.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/third_party/heimdal/lib/hcrypto/libtommath/bn_mp_reduce_2k_setup.c b/third_party/heimdal/lib/hcrypto/libtommath/bn_mp_reduce_2k_setup.c new file mode 100644 index 0000000..2eaf7ad --- /dev/null +++ b/third_party/heimdal/lib/hcrypto/libtommath/bn_mp_reduce_2k_setup.c @@ -0,0 +1,32 @@ +#include "tommath_private.h" +#ifdef BN_MP_REDUCE_2K_SETUP_C +/* LibTomMath, multiple-precision integer library -- Tom St Denis */ +/* SPDX-License-Identifier: Unlicense */ + +/* determines the setup value */ +mp_err mp_reduce_2k_setup(const mp_int *a, mp_digit *d) +{ + mp_err err; + mp_int tmp; + int p; + + if ((err = mp_init(&tmp)) != MP_OKAY) { + return err; + } + + p = mp_count_bits(a); + if ((err = mp_2expt(&tmp, p)) != MP_OKAY) { + mp_clear(&tmp); + return err; + } + + if ((err = s_mp_sub(&tmp, a, &tmp)) != MP_OKAY) { + mp_clear(&tmp); + return err; + } + + *d = tmp.dp[0]; + mp_clear(&tmp); + return MP_OKAY; +} +#endif |