From 3e4c87f12d13cd0a2d139cf8a149874634972afa Mon Sep 17 00:00:00 2001
From: J08nY
Date: Sat, 30 Jun 2018 16:21:12 +0200
Subject: Implement computation of curve metadata(j-invariant, disc, frobenius,
 cm disc).

---
 src/misc/config.h |  2 ++
 src/misc/types.c  |  2 +-
 src/misc/types.h  | 16 ++++++++++++++++
 3 files changed, 19 insertions(+), 1 deletion(-)

(limited to 'src/misc')

diff --git a/src/misc/config.h b/src/misc/config.h
index 7832e88..55a3cdd 100644
--- a/src/misc/config.h
+++ b/src/misc/config.h
@@ -99,6 +99,8 @@ typedef struct {
 	char *hex_check;
 	/** @brief What points to generate on the curves. */
 	struct points_s points;
+	/** @brief Compute curve metadata. */
+	bool metadata;
 
 	/** @brief The datadir to use, if any. */
 	char *datadir;
diff --git a/src/misc/types.c b/src/misc/types.c
index 1554684..ca287a0 100644
--- a/src/misc/types.c
+++ b/src/misc/types.c
@@ -5,7 +5,7 @@
 #include "types.h"
 
 const char* offset_s[OFFSET_END] = {"SEED",  "FIELD", "A",          "B",
-                                    "CURVE", "ORDER", "GENERATORS", "POINTS"};
+                                    "CURVE", "ORDER", "GENERATORS", "POINTS", "METADATA"};
 
 GENERATOR(gen_skip) { return 1; }
 
diff --git a/src/misc/types.h b/src/misc/types.h
index 4b6d8f9..89544f4 100644
--- a/src/misc/types.h
+++ b/src/misc/types.h
@@ -78,6 +78,17 @@ typedef struct {
 	point_t **points;
 } subgroup_t;
 
+/**
+ * @brief Curve metadata.
+ */
+typedef struct {
+	GEN j_invariant;
+	GEN discriminant;
+	GEN cm_discriminant;
+	GEN frobenius_trace;
+	GEN embedding_degree;
+} metadata_t;
+
 /**
  * @brief A curve type.
  * @param seed a seed_t
@@ -87,6 +98,7 @@ typedef struct {
  * @param curve a t_ELL, curve object
  * @param order a t_INT, curve order
  * @param generators generators saved
+ * @param meta
  * @param ngens number of generators saved in the curve type
  */
 typedef struct {
@@ -98,8 +110,11 @@ typedef struct {
 	GEN order;
 	subgroup_t **generators;
 	size_t ngens;
+	metadata_t meta;
 } curve_t;
 
+
+
 /**
  * @brief
  */
@@ -112,6 +127,7 @@ typedef enum {
 	OFFSET_ORDER,
 	OFFSET_GENERATORS,
 	OFFSET_POINTS,
+	OFFSET_METADATA,
 	OFFSET_END
 } offset_e;
 
-- 
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