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[eos/base.git] / util / src / TclTk / tcl8.6.12 / libtommath / bn_mp_reduce_2k_setup.c

diff --git a/util/src/TclTk/tcl8.6.12/libtommath/bn_mp_reduce_2k_setup.c b/util/src/TclTk/tcl8.6.12/libtommath/bn_mp_reduce_2k_setup.c
new file mode 100644 (file)
index 0000000..2eaf7ad
--- /dev/null
+++ b/util/src/TclTk/tcl8.6.12/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