Merge branch 'master' of git+ssh://metalzone.distorted.org.uk/~mdw/public-git/catacomb/

[u/mdw/catacomb] / mp.h

diff --git a/mp.h b/mp.h
index f6fa14f..74b6473 100644 (file)
--- a/mp.h
+++ b/mp.h
@@ -866,6 +866,17 @@ extern mp *mp_sqr(mp */*d*/, mp */*a*/);
 
 extern void mp_div(mp **/*qq*/, mp **/*rr*/, mp */*a*/, mp */*b*/);
 
+/* --- @mp_exp@ --- *
+ *
+ * Arguments:  @mp *d@ = fake destination
+ *             @mp *a@ = base
+ *             @mp *e@ = exponent
+ *
+ * Returns:    Result, %$a^e$%.
+ */
+
+extern mp *mp_exp(mp */*d*/, mp */*a*/, mp */*e*/);
+
 /* --- @mp_odd@ --- *
  *
  * Arguments:  @mp *d@ = pointer to destination integer
@@ -957,6 +968,9 @@ extern int mp_jacobi(mp */*a*/, mp */*n*/);
  *             work if %$p$% is composite: you must factor the modulus, take
  *             a square root mod each factor, and recombine the results
  *             using the Chinese Remainder Theorem.
+ *
+ *             We guarantee that the square root returned is the smallest
+ *             one (i.e., the `positive' square root).
  */
 
 extern mp *mp_modsqrt(mp */*d*/, mp */*a*/, mp */*p*/);