Adding upstream version 2:4.20.0+dfsg.upstream/2%4.20.0+dfsg

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 69 insertions, 0 deletions

diff --git a/third_party/heimdal/lib/hcrypto/libtommath/bn_s_mp_sqr.c b/third_party/heimdal/lib/hcrypto/libtommath/bn_s_mp_sqr.c
new file mode 100644
index 0000000..505c9f0
--- /dev/null
+++ b/third_party/heimdal/lib/hcrypto/libtommath/bn_s_mp_sqr.c
@@ -0,0 +1,69 @@
+#include "tommath_private.h"
+#ifdef BN_S_MP_SQR_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
+
+/* low level squaring, b = a*a, HAC pp.596-597, Algorithm 14.16 */
+mp_err s_mp_sqr(const mp_int *a, mp_int *b)
+{
+   mp_int   t;
+   int      ix, iy, pa;
+   mp_err   err;
+   mp_word  r;
+   mp_digit u, tmpx, *tmpt;
+
+   pa = a->used;
+   if ((err = mp_init_size(&t, (2 * pa) + 1)) != MP_OKAY) {
+      return err;
+   }
+
+   /* default used is maximum possible size */
+   t.used = (2 * pa) + 1;
+
+   for (ix = 0; ix < pa; ix++) {
+      /* first calculate the digit at 2*ix */
+      /* calculate double precision result */
+      r = (mp_word)t.dp[2*ix] +
+          ((mp_word)a->dp[ix] * (mp_word)a->dp[ix]);
+
+      /* store lower part in result */
+      t.dp[ix+ix] = (mp_digit)(r & (mp_word)MP_MASK);
+
+      /* get the carry */
+      u           = (mp_digit)(r >> (mp_word)MP_DIGIT_BIT);
+
+      /* left hand side of A[ix] * A[iy] */
+      tmpx        = a->dp[ix];
+
+      /* alias for where to store the results */
+      tmpt        = t.dp + ((2 * ix) + 1);
+
+      for (iy = ix + 1; iy < pa; iy++) {
+         /* first calculate the product */
+         r       = (mp_word)tmpx * (mp_word)a->dp[iy];
+
+         /* now calculate the double precision result, note we use
+          * addition instead of *2 since it's easier to optimize
+          */
+         r       = (mp_word)*tmpt + r + r + (mp_word)u;
+
+         /* store lower part */
+         *tmpt++ = (mp_digit)(r & (mp_word)MP_MASK);
+
+         /* get carry */
+         u       = (mp_digit)(r >> (mp_word)MP_DIGIT_BIT);
+      }
+      /* propagate upwards */
+      while (u != 0uL) {
+         r       = (mp_word)*tmpt + (mp_word)u;
+         *tmpt++ = (mp_digit)(r & (mp_word)MP_MASK);
+         u       = (mp_digit)(r >> (mp_word)MP_DIGIT_BIT);
+      }
+   }
+
+   mp_clamp(&t);
+   mp_exch(&t, b);
+   mp_clear(&t);
+   return MP_OKAY;
+}
+#endif