From: Mark Wooding <mdw@distorted.org.uk>
Date: Thu, 11 May 2017 09:42:15 +0000 (+0100)
Subject: mp.c: Add binding for `leastcongruent' function.
X-Git-Tag: 1.2.0~2
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~mdw/git/catacomb-python/commitdiff_plain/d0d9458708e431e88d60a9073da384a9d4baa3dd

mp.c: Add binding for `leastcongruent' function.
---

diff --git a/mp.c b/mp.c
index 79c6cf2..88ee738 100644
--- a/mp.c
+++ b/mp.c
@@ -682,6 +682,19 @@ end:
   return (z);
 }
 
+static PyObject *mpmeth_leastcongruent(PyObject *me, PyObject *arg)
+{
+  mp *z, *b, *m;
+  PyObject *rc = 0;
+
+  if (!PyArg_ParseTuple(arg, "O&O&:leastcongruent", convmp, &b, convmp, &m))
+    goto end;
+  z = mp_leastcongruent(MP_NEW, b, MP_X(me), m);
+  rc = mp_pywrap(z);
+end:
+  return (rc);
+}
+
 #define STOREOP(name, c)						\
   static PyObject *mpmeth_##name(PyObject *me,				\
 				 PyObject *arg, PyObject *kw)		\
@@ -792,6 +805,8 @@ static PyMethodDef mp_pymethods[] = {
 	 "X.gcdx(Y) -> (gcd(X, Y), U, V) with X U + Y V = gcd(X, Y)")
   METH	(modinv,	"X.modinv(Y) -> multiplicative inverse of Y mod X")
   METH	(modsqrt,	"X.modsqrt(Y) -> square root of Y mod X, if X prime")
+  METH	(leastcongruent,
+	 "X.leastcongruent(B, M) -> smallest Z >= B with Z == X (mod M)")
   KWMETH(primep,	"X.primep(rng = rand) -> true/false if X is prime")
   KWMETH(tostring,	"X.tostring(radix = 10) -> STR")
   KWMETH(storel,	"X.storel(len = -1) -> little-endian bytes")