Import code from previous AssetBuilder version

thirdparty/libtommath/bn_mp_sqr.c

@@ -0,0 +1,56 @@
+#include "tommath_private.h"
+#ifdef BN_MP_SQR_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis
+ *
+ * LibTomMath is a library that provides multiple-precision
+ * integer arithmetic as well as number theoretic functionality.
+ *
+ * The library was designed directly after the MPI library by
+ * Michael Fromberger but has been written from scratch with
+ * additional optimizations in place.
+ *
+ * SPDX-License-Identifier: Unlicense
+ */
+
+/* computes b = a*a */
+int mp_sqr(const mp_int *a, mp_int *b)
+{
+   int     res;
+
+#ifdef BN_MP_TOOM_SQR_C
+   /* use Toom-Cook? */
+   if (a->used >= TOOM_SQR_CUTOFF) {
+      res = mp_toom_sqr(a, b);
+      /* Karatsuba? */
+   } else
+#endif
+#ifdef BN_MP_KARATSUBA_SQR_C
+      if (a->used >= KARATSUBA_SQR_CUTOFF) {
+         res = mp_karatsuba_sqr(a, b);
+      } else
+#endif
+      {
+#ifdef BN_FAST_S_MP_SQR_C
+         /* can we use the fast comba multiplier? */
+         if ((((a->used * 2) + 1) < (int)MP_WARRAY) &&
+             (a->used <
+              (int)(1u << (((sizeof(mp_word) * (size_t)CHAR_BIT) - (2u * (size_t)DIGIT_BIT)) - 1u)))) {
+            res = fast_s_mp_sqr(a, b);
+         } else
+#endif
+         {
+#ifdef BN_S_MP_SQR_C
+            res = s_mp_sqr(a, b);
+#else
+            res = MP_VAL;
+#endif
+         }
+      }
+   b->sign = MP_ZPOS;
+   return res;
+}
+#endif
+
+/* ref:         HEAD -> master, tag: v1.1.0 */
+/* git commit:  08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
+/* commit time: 2019-01-28 20:32:32 +0100 */