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-rw-r--r--src/exhaustive/exhaustive.c7
-rw-r--r--src/gen/metadata.c38
-rw-r--r--src/gen/metadata.h19
-rw-r--r--src/invalid/invalid.c2
-rw-r--r--src/io/cli.c9
-rw-r--r--src/io/output.c35
-rw-r--r--src/misc/config.h2
-rw-r--r--src/misc/types.c2
-rw-r--r--src/misc/types.h16
9 files changed, 128 insertions, 2 deletions
diff --git a/src/exhaustive/exhaustive.c b/src/exhaustive/exhaustive.c
index 28d464a..15b299a 100644
--- a/src/exhaustive/exhaustive.c
+++ b/src/exhaustive/exhaustive.c
@@ -15,6 +15,7 @@
#include "gen/hex.h"
#include "gen/order.h"
#include "gen/point.h"
+#include "gen/metadata.h"
#include "gen/seed.h"
#include "io/output.h"
#include "misc/config.h"
@@ -182,6 +183,12 @@ static void exhaustive_ginit(gen_f *generators) {
generators[OFFSET_CURVE] = &curve_gen_any;
}
+ if (cfg->metadata) {
+ generators[OFFSET_METADATA] = &metadata_gen;
+ } else {
+ generators[OFFSET_METADATA] = &gen_skip;
+ }
+
switch (cfg->points.type) {
case POINTS_RANDOM:
if (cfg->points.amount) {
diff --git a/src/gen/metadata.c b/src/gen/metadata.c
new file mode 100644
index 0000000..512c30c
--- /dev/null
+++ b/src/gen/metadata.c
@@ -0,0 +1,38 @@
+/*
+ * ecgen, tool for generating Elliptic curve domain parameters
+ * Copyright (C) 2017-2018 J08nY
+ */
+#include "gens.h"
+#include "field.h"
+#include "metadata.h"
+
+GENERATOR(metadata_gen) {
+ GEN j = field_elementi(ell_get_j(curve->curve));
+ GEN disc = field_elementi(ell_get_disc(curve->curve));
+ GEN embedding_degree;
+ GEN q;
+ if (typ(curve->field) == t_INT) {
+ embedding_degree = gens_get_embedding(curve->field, curve->order);
+ q = curve->field;
+ } else if (typ(curve->field) == t_FFELT){
+ embedding_degree = NULL;
+ q = int2n(degree(FF_mod(curve->field)));
+ } else {
+ return -7;
+ }
+ GEN frobenius = negi(subii(curve->order, addis(q, 1)));
+ GEN cm_disc;
+ if (typ(curve->field) == t_INT) {
+ cm_disc = core(subii(mulis(q, 4), sqri(frobenius)));
+ } else if (typ(curve->field) == t_FFELT){
+ cm_disc = NULL;
+ } else {
+ return -7;
+ }
+ curve->meta.j_invariant = j;
+ curve->meta.discriminant = disc;
+ curve->meta.embedding_degree = embedding_degree;
+ curve->meta.frobenius_trace = frobenius;
+ curve->meta.cm_discriminant = cm_disc;
+ return 1;
+}
diff --git a/src/gen/metadata.h b/src/gen/metadata.h
new file mode 100644
index 0000000..914828c
--- /dev/null
+++ b/src/gen/metadata.h
@@ -0,0 +1,19 @@
+/*
+ * ecgen, tool for generating Elliptic curve domain parameters
+ * Copyright (C) 2017-2018 J08nY
+ */
+#ifndef ECGEN_GEN_METADATA_H
+#define ECGEN_GEN_METADATA_H
+
+#include "misc/types.h"
+
+/**
+ * @brief
+ * @param curve
+ * @param args
+ * @param state
+ * @return
+ */
+GENERATOR(metadata_gen);
+
+#endif //ECGEN_GEN_METADATA_H
diff --git a/src/invalid/invalid.c b/src/invalid/invalid.c
index 70ecda4..9b4dcb2 100644
--- a/src/invalid/invalid.c
+++ b/src/invalid/invalid.c
@@ -37,6 +37,7 @@ static void invalid_original_ginit(gen_f *generators) {
generators[OFFSET_GENERATORS] = &gens_gen_any;
generators[OFFSET_CURVE] = &curve_gen_any;
generators[OFFSET_ORDER] = &order_gen_any;
+ generators[OFFSET_METADATA] = &gen_skip;
}
static void invalid_invalid_ginit(gen_f *generators) {
@@ -52,6 +53,7 @@ static void invalid_invalid_ginit(gen_f *generators) {
generators[OFFSET_GENERATORS] = &gens_gen_any;
}
generators[OFFSET_POINTS] = &points_gen_trial;
+ generators[OFFSET_METADATA] = &gen_skip;
}
static void invalid_cinit(check_t **validators) {
diff --git a/src/io/cli.c b/src/io/cli.c
index 14d51f8..32888a8 100644
--- a/src/io/cli.c
+++ b/src/io/cli.c
@@ -39,6 +39,7 @@ enum opt_keys {
OPT_TIMEOUT,
OPT_ANOMALOUS,
OPT_HEXCHECK,
+ OPT_METADATA,
OPT_BRAINPOOL_RFC,
OPT_TWIST,
};
@@ -59,7 +60,8 @@ struct argp_option cli_options[] = {
{"twist", OPT_TWIST, 0, 0, "Generate a twist of a given curve.", 2},
{0, 0, 0, 0, "Generation options:", 3},
- {"random", OPT_RANDOM, "WHAT", OPTION_ARG_OPTIONAL, "Generate a random curve (using Random approach). Optionally, only generate random parameters WHAT (seed,field,a,b,equation).", 3},
+ {"random", OPT_RANDOM, "WHAT", OPTION_ARG_OPTIONAL, "Generate a random curve (using Random approach). "
+ "Optionally, only generate random parameters WHAT (seed,field,a,b,equation).", 3},
{"prime", OPT_PRIME, 0, 0, "Generate a curve with prime order.", 3},
{"cofactor", OPT_COFACTOR, "VALUE", 0, "Generate a curve with cofactor of VALUE.", 3},
{"koblitz", OPT_KOBLITZ, "A", OPTION_ARG_OPTIONAL, "Generate a Koblitz curve (a in {0, 1}, b = 1).", 3},
@@ -67,6 +69,8 @@ struct argp_option cli_options[] = {
{"hex-check", OPT_HEXCHECK, "HEX", 0, "Check a generated curve param hex expansion for the HEX string.", 3},
{"points", OPT_POINTS, "TYPE", 0, "Generate points of given type (random/prime/all/nonprime/none).", 3},
{"count", OPT_COUNT, "COUNT", 0, "Generate multiple curves.", 3},
+ {"metadata", OPT_METADATA, 0, 0, "Compute curve metadata "
+ "(j-invariant, discriminant, trace of Frobenius, embedding degree, CM discriminant).", 3},
{0, 0, 0, 0, "Input/Output options:", 4},
{"input", OPT_INPUT, "FILE", 0, "Input from file.", 4},
@@ -310,6 +314,9 @@ error_t cli_parse(int key, char *arg, struct argp_state *state) {
cfg->hex_check = str_start;
break;
}
+ case OPT_METADATA:
+ cfg->metadata = true;
+ break;
case OPT_POINTS: {
char *num_end;
long amount = strtol(arg, &num_end, 10);
diff --git a/src/io/output.c b/src/io/output.c
index 2130614..8ad4ab0 100644
--- a/src/io/output.c
+++ b/src/io/output.c
@@ -5,6 +5,8 @@
#include "output.h"
#include <parson/parson.h>
+#include <misc/config.h>
+#include <misc/types.h>
#include "gen/field.h"
#include "util/bits.h"
#include "util/memory.h"
@@ -120,6 +122,39 @@ static JSON_Value *output_jjson(curve_t *curve) {
}
json_object_set_value(root_object, "subgroups", gens_value);
}
+ if (cfg->metadata) {
+ debug_log("here");
+ if (curve->meta.j_invariant != NULL) {
+ char *j = pari_sprintf("%Pi", curve->meta.j_invariant);
+ json_object_dotset_string(root_object, "meta.j", j);
+ pari_free(j);
+ }
+ debug_log("here");
+ if (curve->meta.discriminant != NULL) {
+ char *disc = pari_sprintf("%Pi", curve->meta.discriminant);
+ json_object_dotset_string(root_object, "meta.discriminant", disc);
+ pari_free(disc);
+ }
+ debug_log("here");
+ if (curve->meta.embedding_degree != NULL) {
+ char *embedding_degree = pari_sprintf("%Pi", curve->meta.embedding_degree);
+ json_object_dotset_string(root_object, "meta.embedding_degree", embedding_degree);
+ pari_free(embedding_degree);
+ }
+ debug_log("here");
+ if (curve->meta.frobenius_trace != NULL) {
+ char *frobenius = pari_sprintf("%Pi", curve->meta.frobenius_trace);
+ json_object_dotset_string(root_object, "meta.frobenius", frobenius);
+ pari_free(frobenius);
+ }
+ debug_log("here");
+ if (curve->meta.cm_discriminant != NULL) {
+ char *cm_discriminant = pari_sprintf("%Pi", curve->meta.cm_discriminant);
+ json_object_dotset_string(root_object, "meta.cm_discriminant", cm_discriminant);
+ pari_free(cm_discriminant);
+ }
+ debug_log("here");
+ }
avma = ltop;
return root_value;
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
@@ -79,6 +79,17 @@ typedef struct {
} 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
* @param field a t_INT or t_FFELT
@@ -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;
generated by cgit v1.2.3-70-g09d2 (git 2.51.2) at 2025-11-08 16:12:28 +0000