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/*
* ecgen, tool for generating Elliptic curve domain parameters
* Copyright (C) 2017 J08nY
*/
#include "cli.h"
#include <string.h>
char doc[] =
"ecgen, tool for generating Elliptic curve domain parameters.\v(C) 2017 "
"Eastern Seaboard Phishing Authority";
char args_doc[] = "bits";
enum opt_keys {
OPT_DATADIR = 'd',
OPT_PRIME = 'p',
OPT_RANDOM = 'r',
OPT_SEED = 's',
OPT_INVALID = 'i',
OPT_ORDER = 'n',
OPT_KOBLITZ = 'k',
OPT_OUTPUT = 'o',
OPT_INPUT = 'f',
OPT_APPEND = 'a',
OPT_FP = 1,
OPT_F2M = 2,
};
// clang-format off
struct argp_option options[] = {
// Field specification
{"fp", OPT_FP, 0, 0, "Prime field."},
{"f2m", OPT_F2M, 0, 0, "Binary field."},
// Curve specification
{"random", OPT_RANDOM, 0, 0, "Generate a random curve."},
{"prime", OPT_PRIME, 0, 0, "Generate a curve with prime order."},
{"seed", OPT_SEED, "SEED", OPTION_ARG_OPTIONAL, "Generate a curve from SEED (ANSI X9.62 verifiable procedure)."},
{"invalid", OPT_INVALID, 0, 0, "Generate a set of invalid curves (for a given curve)."},
{"order", OPT_ORDER, "ORDER", 0, "Generate a curve with given order (using Complex Multiplication)."},
{"koblitz", OPT_KOBLITZ, 0, 0, "Generate a Koblitz curve."},
// Other
{"data-dir", OPT_DATADIR, "DIR", 0, "PARI/GP data directory (containing seadata package)."},
{"input", OPT_INPUT, "FILE", 0, "Input from file."},
{"output", OPT_OUTPUT, "FILE", 0, "Output into file. Overwrites any existing file!"},
{"append", OPT_APPEND, 0, 0, "Append to output file (don't overwrite)."},
{0}};
// clang-format on
error_t parse_opt(int key, char *arg, struct argp_state *state) {
struct config_t *cfg = state->input;
switch (key) {
case OPT_DATADIR:
cfg->datadir = arg;
break;
case OPT_INPUT:
cfg->input = arg;
break;
case OPT_OUTPUT:
cfg->output = arg;
break;
case OPT_APPEND:
cfg->append = true;
break;
case OPT_RANDOM:
cfg->random = true;
break;
case OPT_PRIME:
cfg->prime = true;
break;
case OPT_INVALID:
cfg->invalid = true;
break;
case OPT_ORDER:
cfg->cm = true;
if (arg) {
cfg->order = arg;
}
break;
case OPT_KOBLITZ:
cfg->koblitz = true;
break;
case OPT_SEED:
cfg->from_seed = true;
if (arg) {
// ANSI X9.62 specifies seed as at least 160 bits in length.
if (strlen(arg) < 20) {
argp_failure(
state, 1, 0,
"SEED must be at least 160 bits(20 characters).");
}
cfg->seed = arg;
}
break;
case OPT_FP:
cfg->field = FIELD_PRIME;
cfg->prime_field = true;
break;
case OPT_F2M:
cfg->field = FIELD_BINARY;
cfg->binary_field = true;
break;
case ARGP_KEY_ARG:
if (state->arg_num >= 1) {
argp_usage(state);
}
cfg->bits = strtol(arg, NULL, 10);
break;
case ARGP_KEY_END:
// validate all option states here.
// Only one field
if (!cfg->prime_field && !cfg->binary_field) {
argp_failure(state, 1, 0,
"Specify field type, prime or binary, with --fp / "
"--f2m(but not both).");
}
// Invalid is not prime or seed or random by definition.
if (cfg->invalid && (cfg->prime || cfg->from_seed || cfg->random)) {
// not seed, not prime, not random
argp_failure(state, 1, 0,
"Invalid curve generation can not generate curves "
"from seed, random or prime order.");
}
if (cfg->cm && (cfg->prime || cfg->from_seed || cfg->invalid)) {
argp_failure(state, 1, 0,
"Fixed order curve generation can not generate "
"curves from seed, or invalid curves. Prime order "
"also doesn't make sense if the given one isn't "
"prime.");
}
break;
case ARGP_KEY_NO_ARGS:
argp_usage(state);
break;
default:
return ARGP_ERR_UNKNOWN;
}
return 0;
}
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