1 files changed, 86 insertions, 0 deletions
diff --git a/src/seed.c b/src/seed.c
new file mode 100644
index 0000000..411195f
--- /dev/null
+++ b/src/seed.c
@@ -0,0 +1,86 @@
+/*
+ * ecgen, tool for generating Elliptic curve domain parameters
+ * Copyright (C) 2017 J08nY
+ */
+#include "seed.h"
+#include "input.h"
+
+seed_t *seed_new() {
+	seed_t *seed = pari_malloc(sizeof(seed_t));
+	if (!seed) {
+		perror("Couldn't malloc.");
+		exit(1);
+	}
+	memset(seed, 0, sizeof(seed_t));
+	return seed;
+}
+
+void seed_free(seed_t **seed) {
+	if (*seed) {
+		pari_free(*seed);
+		*seed = NULL;
+	}
+}
+
+GEN seed_stoi(const char *cstr) {
+	pari_sp ltop = avma;
+	GEN seed = gen_0;
+
+	size_t len = strlen(cstr);
+	for (size_t i = 0; i < len; ++i) {
+		pari_sp btop = avma;
+		GEN s = stoi(cstr[i]);
+		s = shifti(s, (len - i - 1) * 8);
+		seed = addii(seed, s);
+		if (gc_needed(btop, 1)) gerepileall(btop, 1, seed);
+	}
+
+	return gerepilecopy(ltop, seed);
+}
+
+int seed_random(curve_t *curve, config_t *config) {
+	curve->seed = seed_new();
+	curve->seed->seed = random_int(160);
+	return 1;
+}
+
+int seed_argument(curve_t *curve, config_t *config) {
+	curve->seed = seed_new();
+	curve->seed->seed = seed_stoi(config->seed);
+	return 1;
+}
+
+int seed_input(curve_t *curve, config_t *config) {
+	pari_sp ltop = avma;
+
+	GEN str = fread_string(in, "seed:", '\n');
+	const char *cstr = GSTR(str);
+	if (strlen(cstr) < 20) {
+		fprintf(stderr, "SEED must be at least 160 bits(20 characters).\n");
+		avma = ltop;
+		return 0;
+	}
+
+	GEN seed = seed_stoi(cstr);
+	gerepileall(ltop, 1, &seed);
+
+	curve->seed = seed_new();
+	curve->seed->seed = seed;
+	return 1;
+}
+
+int seed_g(curve_t *curve, config_t *config) {
+	if (config->from_seed) {
+		if (config->seed) {
+			return seed_argument(curve, config);
+		} else {
+			if (config->random) {
+				return seed_random(curve, config);
+			} else {
+				return seed_input(curve, config);
+			}
+		}
+	} else {
+		return 1;  // seed none.. skip
+	}
+}
+\ No newline at end of file