Moved to a more modular generation process

Curves are now generated in a loop through a func. pointer array, built
from cli args.

- Allows complex behavior from simple funcs
- a func can "rewind" previous generation steps, if it can not
succesfuly guarantee that it will generate a curve/param/point with
property requested.
- e.g. curve_nonzero rewinds [b, a, field] (returns -3) if the curve
specified by [field, a, b] has a zero discriminant. This way, [field, a,
b] can be generated/produced/input again and a curve might get
constructed that will be nonzero.

1 files changed, 39 insertions, 0 deletions

diff --git a/src/generators.c b/src/generators.c
new file mode 100644
index 0000000..79320f2
--- /dev/null
+++ b/src/generators.c
@@ -0,0 +1,39 @@
+/*
+ * ecgen, tool for generating Elliptic curve domain parameters
+ * Copyright (C) 2017 J08nY
+ */
+#include "generators.h"
+#include "curve.h"
+#include "equation.h"
+#include "field.h"
+#include "seed.h"
+
+int gen_skip(curve_t *curve, config_t *config) { return 1; }
+
+void gen_init(gen_t generators[], config_t *config) {
+	if (config->from_seed) {
+		if (config->seed) {
+			generators[OFFSET_SEED] = &seed_argument;
+		} else {
+			if (config->random) {
+				generators[OFFSET_SEED] = &seed_random;
+			} else {
+				generators[OFFSET_SEED] = &seed_input;
+			}
+		}
+		generators[OFFSET_A] = &a_seed;
+		generators[OFFSET_B] = &b_seed;
+		generators[OFFSET_CURVE] = &curve_seed;
+	} else {
+		generators[OFFSET_SEED] = &gen_skip;
+		generators[OFFSET_A] = &a_random;
+		generators[OFFSET_B] = &b_random;
+		if (config->prime) {
+			generators[OFFSET_CURVE] = &curve_prime;
+		} else {
+			generators[OFFSET_CURVE] = &curve_nonzero;
+		}
+	}
+
+	generators[OFFSET_FIELD] = &field_random;
+}
\ No newline at end of file