Expunge revision histories in files.

[u/mdw/catacomb] / mp.h

diff --git a/mp.h b/mp.h
index bfed14a..8319173 100644 (file)
--- a/mp.h
+++ b/mp.h
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: mp.h,v 1.18 2004/04/03 03:32:05 mdw Exp $
+ * $Id: mp.h,v 1.19 2004/04/08 01:36:15 mdw Exp $
  *
  * Simple multiprecision arithmetic
  *
@@ -27,67 +27,6 @@
  * MA 02111-1307, USA.
  */
 
-/*----- Revision history --------------------------------------------------* 
- *
- * $Log: mp.h,v $
- * Revision 1.18  2004/04/03 03:32:05  mdw
- * General robustification.
- *
- * Revision 1.17  2003/05/16 09:09:24  mdw
- * Fix @mp_lsl2c@.  Turns out to be surprisingly tricky.
- *
- * Revision 1.16  2002/10/15 22:57:22  mdw
- * Handy new comparison macros.
- *
- * Revision 1.15  2002/10/15 19:18:31  mdw
- * New operation to negate numbers.
- *
- * Revision 1.14  2002/10/15 00:19:40  mdw
- * Bit setting and clearing functions.
- *
- * Revision 1.13  2002/10/06 22:52:50  mdw
- * Pile of changes for supporting two's complement properly.
- *
- * Revision 1.12  2001/06/16 12:57:43  mdw
- * Move the @mpmont_factor@ structure and rename it now that it's used for
- * Barrett simultaneous exponentiation too.
- *
- * Revision 1.11  2001/04/03 19:36:05  mdw
- * Add some simple bitwise operations so that Perl can use them.
- *
- * Revision 1.10  2000/10/08 12:03:16  mdw
- * Provide @mp_eq@ and @MP_EQ@ for rapidly testing equality of two
- * integers.
- *
- * Revision 1.9  2000/07/29 17:03:31  mdw
- * Add support for left-to-right bitscanning, for use in modular
- * exponentiation.
- *
- * Revision 1.8  2000/06/22 19:02:01  mdw
- * Add new functions.
- *
- * Revision 1.7  2000/06/17 11:45:09  mdw
- * Major memory management overhaul.  Added arena support.  Use the secure
- * arena for secret integers.  Replace and improve the MP management macros
- * (e.g., replace MP_MODIFY by MP_DEST).
- *
- * Revision 1.6  1999/12/10 23:19:46  mdw
- * Minor bugfixes.  New interface for suggested destinations.
- *
- * Revision 1.5  1999/11/22 20:50:37  mdw
- * Add support for computing Jacobi symbols.
- *
- * Revision 1.4  1999/11/21 22:13:02  mdw
- * Add mp version of MPX_BITS.
- *
- * Revision 1.3  1999/11/19 13:19:14  mdw
- * Fix const annotation.
- *
- * Revision 1.2  1999/11/17 18:02:16  mdw
- * New multiprecision integer arithmetic suite.
- *
- */
-
 #ifndef CATACOMB_MP_H
 #define CATACOMB_MP_H
 
@@ -975,6 +914,20 @@ extern mp *mp_sqrt(mp */*d*/, mp */*a*/);
 extern void mp_gcd(mp **/*gcd*/, mp **/*xx*/, mp **/*yy*/,
                   mp */*a*/, mp */*b*/);
 
+/* -- @mp_modinv@ --- *
+ *
+ * Arguments:  @mp *d@ = destination
+ *             @mp *x@ = argument
+ *             @mp *p@ = modulus
+ *
+ * Returns:    The inverse %$x^{-1} \bmod p$%.
+ *
+ * Use:                Computes a modular inverse.    An assertion fails if %$p$%
+ *             has no inverse.
+ */
+
+extern mp *mp_modinv(mp */*d*/, mp */*x*/, mp */*p*/);
+
 /* --- @mp_jacobi@ --- *
  *
  * Arguments:  @mp *a@ = an integer less than @n@