X-Git-Url: https://git.distorted.org.uk/~mdw/secnet/blobdiff_plain/b7a5ecfcbac18c56d0b044975f6ed6835dd86ab4..refs/heads/mdw/xdh:/fgoldi.h

diff --git a/fgoldi.h b/fgoldi.h
index b05fd77..37dc6e2 100644
--- a/fgoldi.h
+++ b/fgoldi.h
@@ -7,7 +7,26 @@
 
 /*----- Licensing notice --------------------------------------------------*
  *
- * This file is part of Catacomb.
+ * This file is part of secnet.
+ * See README for full list of copyright holders.
+ *
+ * secnet is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version d of the License, or
+ * (at your option) any later version.
+ *
+ * secnet is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 3 along with secnet; if not, see
+ * https://www.gnu.org/licenses/gpl.html.
+ *
+ * This file was originally part of Catacomb, but has been automatically
+ * modified for incorporation into secnet: see `import-catacomb-crypto'
+ * for details.
  *
  * Catacomb is free software; you can redistribute it and/or modify
  * it under the terms of the GNU Library General Public License as
@@ -34,7 +53,7 @@
 
 /*----- Header files ------------------------------------------------------*/
 
-#include <mLib/bits.h>
+#include "fake-mLib-bits.h"
 
 #ifndef CATACOMB_QFARITH_H
 #  include "qfarith.h"
@@ -44,16 +63,9 @@
 
 typedef union {
   int32 p28[16];
-  int16 p12[40];
 } fgoldi;
 
-#if !defined(FGOLDI_IMPL) && defined(HAVE_INT64)
-#  define FGOLDI_IMPL 28
-#endif
-
-#ifndef FGOLDI_IMPL
-#  define FGOLDI_IMPL 12
-#endif
+  typedef int32 fgoldi_piece;
 
 /*----- Functions provided ------------------------------------------------*/
 
@@ -127,6 +139,52 @@ extern void fgoldi_add(fgoldi */*z*/,
 extern void fgoldi_sub(fgoldi */*z*/,
 		       const fgoldi */*x*/, const fgoldi */*y*/);
 
+/* --- @fgoldi_neg@ --- *
+ *
+ * Arguments:	@fgoldi *z@ = where to put the result (may alias @x@)
+ *		@const fgoldi *x@ = an operand
+ *
+ * Returns:	---
+ *
+ * Use:		Set @z = -x@.
+ */
+
+extern void fgoldi_neg(fgoldi */*z*/, const fgoldi */*x*/);
+
+/* --- @fgoldi_pick2@ --- *
+ *
+ * Arguments:	@fgoldi *z@ = where to put the result (may alias @x@ or @y@)
+ *		@const fgoldi *x, *y@ = two operands
+ *		@uint32 m@ = a mask
+ *
+ * Returns:	---
+ *
+ * Use:		If @m@ is zero, set @z = y@; if @m@ is all-bits-set, then set
+ *		@z = x@.  If @m@ has some other value, then scramble @z@ in
+ *		an unhelpful way.
+ */
+
+extern void fgoldi_pick2(fgoldi */*z*/,
+			 const fgoldi */*x*/, const fgoldi */*y*/,
+			 uint32 /*m*/);
+
+/* --- @fgoldi_pickn@ --- *
+ *
+ * Arguments:	@fgoldi *z@ = where to put the result
+ *		@const fgoldi *v@ = a table of entries
+ *		@size_t n@ = the number of entries in @v@
+ *		@size_t i@ = an index
+ *
+ * Returns:	---
+ *
+ * Use:		If @0 <= i < n < 32@ then set @z = v[i]@.  If @n >= 32@ then
+ *		do something unhelpful; otherwise, if @i >= n@ then set @z@
+ *		to zero.
+ */
+
+extern void fgoldi_pickn(fgoldi */*z*/,
+			 const fgoldi */*v*/, size_t /*n*/, size_t /*i*/);
+
 /* --- @fgoldi_condswap@ --- *
  *
  * Arguments:	@fgoldi *x, *y@ = two operands
@@ -141,6 +199,21 @@ extern void fgoldi_sub(fgoldi */*z*/,
 
 extern void fgoldi_condswap(fgoldi */*x*/, fgoldi */*y*/, uint32 /*m*/);
 
+/* --- @fgoldi_condneg@ --- *
+ *
+ * Arguments:	@fgoldi *z@ = where to put the result (may alias @x@)
+ *		@const fgoldi *x@ = an operand
+ *		@uint32 m@ = a mask
+ *
+ * Returns:	---
+ *
+ * Use:		If @m@ is zero, set @z = x@; if @m@ is all-bits-set, then set
+ *		@z = -x@.  If @m@ has some other value then scramble @z@ in
+ *		an unhelpful way.
+ */
+
+extern void fgoldi_condneg(fgoldi */*z*/, const fgoldi */*x*/, uint32 /*m*/);
+
 /* --- @fgoldi_mulconst@ --- *
  *
  * Arguments:	@fgoldi *z@ = where to put the result (may alias @x@)
@@ -193,6 +266,22 @@ extern void fgoldi_sqr(fgoldi */*z*/, const fgoldi */*x*/);
 
 extern void fgoldi_inv(fgoldi */*z*/, const fgoldi */*x*/);
 
+/* --- @fgoldi_quosqrt@ --- *
+ *
+ * Arguments:	@fgoldi *z@ = where to put the result (may alias @x@ or @y@)
+ *		@const fgoldi *x, *y@ = two operands
+ *
+ * Returns:	Zero if successful, @-1@ if %$x/y$% is not a square.
+ *
+ * Use:		Stores in @z@ the one of the square roots %$\pm\sqrt{x/y}$%.
+ *		If %$x = y = 0% then the result is zero; if %$y = 0$% but %$x
+ *		\ne 0$% then the operation fails.  If you wanted a specific
+ *		square root then you'll have to pick it yourself.
+ */
+
+extern int fgoldi_quosqrt(fgoldi */*z*/,
+			  const fgoldi */*x*/, const fgoldi */*y*/);
+
 /*----- That's all, folks -------------------------------------------------*/
 
 #ifdef __cplusplus