5 files changed, 61 insertions, 18 deletions

diff --git a/src/exhaustive/exhaustive.c b/src/exhaustive/exhaustive.c
index 78338a6..79ae590 100644
--- a/src/exhaustive/exhaustive.c
+++ b/src/exhaustive/exhaustive.c
@@ -3,6 +3,7 @@
  * Copyright (C) 2017-2018 J08nY
  */
 #include "exhaustive.h"
+#include <misc/config.h>
 #include "anomalous.h"
 #include "ansi.h"
 #include "brainpool.h"
@@ -62,13 +63,13 @@ static void exhaustive_ginit(gen_f *generators) {
 				if (cfg->seed) {
 					generators[OFFSET_SEED] = &ansi_gen_seed_argument;
 				} else {
-					if (cfg->random) {
+					if (cfg->random & RANDOM_SEED) {
 						generators[OFFSET_SEED] = &ansi_gen_seed_random;
 					} else {
 						generators[OFFSET_SEED] = &ansi_gen_seed_input;
 					}
 				}
-				if (cfg->random) {
+				if (cfg->random & RANDOM_FIELD) {
 					generators[OFFSET_FIELD] = &field_gen_random;
 				} else {
 					generators[OFFSET_FIELD] = &field_gen_input;
@@ -80,7 +81,7 @@ static void exhaustive_ginit(gen_f *generators) {
 				if (cfg->seed) {
 					generators[OFFSET_SEED] = &brainpool_gen_seed_argument;
 				} else {
-					if (cfg->random) {
+					if (cfg->random & RANDOM_SEED) {
 						generators[OFFSET_SEED] = &brainpool_gen_seed_random;
 					} else {
 						generators[OFFSET_SEED] = &brainpool_gen_seed_input;
@@ -96,7 +97,7 @@ static void exhaustive_ginit(gen_f *generators) {
 				if (cfg->seed) {
 					generators[OFFSET_SEED] = &brainpool_rfc_gen_seed_argument;
 				} else {
-					if (cfg->random) {
+					if (cfg->random & RANDOM_SEED) {
 						generators[OFFSET_SEED] =
 						    &brainpool_rfc_gen_seed_random;
 					} else {
@@ -121,9 +122,6 @@ static void exhaustive_ginit(gen_f *generators) {
 		if (cfg->method == METHOD_ANOMALOUS) {
 			generators[OFFSET_A] = &gen_skip;
 			generators[OFFSET_B] = &anomalous_gen_equation;
-		} else if (cfg->random) {
-			generators[OFFSET_A] = &a_gen_random;
-			generators[OFFSET_B] = &b_gen_random;
 		} else if (cfg->koblitz) {
 			switch (cfg->koblitz_value) {
 				case 0:
@@ -139,6 +137,13 @@ static void exhaustive_ginit(gen_f *generators) {
 		} else {
 			generators[OFFSET_A] = &a_gen_input;
 			generators[OFFSET_B] = &b_gen_input;
+
+			if (cfg->random & RANDOM_A) {
+				generators[OFFSET_A] = &a_gen_random;
+			}
+			if (cfg->random & RANDOM_B) {
+				generators[OFFSET_B] = &b_gen_random;
+			}
 		}
 
 		if (cfg->prime) {
@@ -155,7 +160,7 @@ static void exhaustive_ginit(gen_f *generators) {
 
 		if (cfg->method == METHOD_ANOMALOUS) {
 			generators[OFFSET_FIELD] = &anomalous_gen_field;
-		} else if (cfg->random) {
+		} else if (cfg->random & RANDOM_FIELD) {
 			generators[OFFSET_FIELD] = &field_gen_random;
 		} else {
 			generators[OFFSET_FIELD] = &field_gen_input;
diff --git a/src/invalid/invalid.c b/src/invalid/invalid.c
index adcec67..aeda327 100644
--- a/src/invalid/invalid.c
+++ b/src/invalid/invalid.c
@@ -3,7 +3,6 @@
  * Copyright (C) 2017-2018 J08nY
  */
 #include "invalid.h"
-#include <exhaustive/exhaustive.h>
 #include "exhaustive/arg.h"
 #include "exhaustive/check.h"
 #include "exhaustive/exhaustive.h"
@@ -14,18 +13,23 @@
 #include "gen/order.h"
 #include "gen/point.h"
 #include "invalid_thread.h"
-#include "io/output.h"
 #include "util/memory.h"
 
 static void invalid_original_ginit(gen_f *generators) {
 	generators[OFFSET_SEED] = &gen_skip;
-	if (cfg->random) {
+	if (cfg->random & RANDOM_FIELD) {
 		generators[OFFSET_FIELD] = &field_gen_random;
-		generators[OFFSET_A] = &a_gen_random;
-		generators[OFFSET_B] = &b_gen_random;
 	} else {
 		generators[OFFSET_FIELD] = &field_gen_input;
+	}
+	if (cfg->random & RANDOM_A) {
+		generators[OFFSET_A] = &a_gen_random;
+	} else {
 		generators[OFFSET_A] = &a_gen_input;
+	}
+	if (cfg->random & RANDOM_B) {
+		generators[OFFSET_B] = &b_gen_random;
+	} else {
 		generators[OFFSET_B] = &b_gen_input;
 	}
 	generators[OFFSET_GENERATORS] = &gens_gen_any;
diff --git a/src/io/cli.c b/src/io/cli.c
index ae11836..2cc6e0f 100644
--- a/src/io/cli.c
+++ b/src/io/cli.c
@@ -57,7 +57,7 @@ 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,        0,        0,                 "Generate a random curve (using Random approach).",                                      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},
@@ -263,7 +263,28 @@ error_t cli_parse(int key, char *arg, struct argp_state *state) {
 			cfg->count = strtoul(arg, NULL, 10);
 			break;
 		case OPT_RANDOM:
-			cfg->random = true;
+			if (arg) {
+				char *token = strtok(arg, ",");
+				while (token) {
+					if (strcmp(token, "seed") == 0) {
+						cfg->random |= RANDOM_SEED;
+					} else if (strcmp(token, "field") == 0) {
+						cfg->random |= RANDOM_FIELD;
+					} else if (strcmp(token, "a") == 0) {
+						cfg->random |= RANDOM_A;
+					} else if (strcmp(token, "b") == 0) {
+						cfg->random |= RANDOM_B;
+					} else if (strcmp(token, "equation") == 0) {
+						cfg->random |= RANDOM_EQUATION;
+					} else {
+						argp_failure(state, 1, 0, "Wrong value for random = %s",
+						             token);
+					}
+					token = strtok(NULL, ",");
+				}
+			} else {
+				cfg->random = RANDOM_ALL;
+			}
 			break;
 		case OPT_PRIME:
 			cfg->prime = true;
diff --git a/src/misc/config.h b/src/misc/config.h
index 2800783..1a732ba 100644
--- a/src/misc/config.h
+++ b/src/misc/config.h
@@ -29,12 +29,25 @@ struct points_s {
  * @brief
  */
 typedef enum {
+	RANDOM_NONE = 0,
+	RANDOM_SEED = 1 << 0,
+	RANDOM_FIELD = 1 << 1,
+	RANDOM_A = 1 << 2,
+	RANDOM_B = 1 << 3,
+	RANDOM_EQUATION = RANDOM_A | RANDOM_B,
+	RANDOM_ALL = RANDOM_SEED | RANDOM_FIELD | RANDOM_EQUATION
+} random_e;
+
+/**
+ * @brief
+ */
+typedef enum {
 	METHOD_DEFAULT = 0,
 	METHOD_CM = 1 << 0,
 	METHOD_ANOMALOUS = 1 << 1,
 	METHOD_SEED = 1 << 2,
 	METHOD_INVALID = 1 << 3,
-	METHOD_TWIST
+	METHOD_TWIST = 1 << 4
 } method_e;
 
 /**
@@ -60,8 +73,8 @@ typedef struct {
 
 	/** @brief How many curves should be generated. */
 	long count;
-	/** @brief Whether the curves should be generated at random (no input). */
-	bool random;
+	/** @brief What parameters should be generated at random (no input). */
+	random_e random;
 	/** @brief Whether the curves should have prime order. */
 	bool prime;
 	/** @brief Whether the Complex Multiplication method should be used. */
diff --git a/test/ecgen.sh b/test/ecgen.sh
index b86f13b..b86f13b 100644..100755
--- a/test/ecgen.sh
+++ b/test/ecgen.sh