0.2.0

1 files changed, 35 insertions, 0 deletions

diff --git a/src/curve.c b/src/curve.c
new file mode 100644
index 0000000..0d15ccf
--- /dev/null
+++ b/src/curve.c
@@ -0,0 +1,35 @@
+/*
+ * ecgen, tool for generating Elliptic curve domain parameters
+ * Copyright (C) 2017 J08nY
+ */
+#include "curve.h"
+
+GEN curve_random(GEN field) {
+	pari_sp ltop = avma;
+
+	GEN curve;
+	do {
+		GEN a = genrand(field);
+		GEN b = genrand(field);
+
+		GEN v = gen_0;
+		switch (typ(field)) {
+			case t_INT:
+				v = gtovec0(gen_0, 2);
+				gel(v, 1) = a;
+				gel(v, 2) = b;
+				break;
+			case t_FFELT:
+				v = gtovec0(gen_0, 5);
+				gel(v, 1) = gen_1;
+				gel(v, 4) = a;
+				gel(v, 5) = b;
+				break;
+			default:
+				pari_err_TYPE("curve_random", field);
+		}
+		curve = ellinit(v, field, -1);
+	} while (gequal0(ell_get_disc(curve)));
+
+	return gerepilecopy(ltop, curve);
+}