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/*
* ecgen, tool for generating Elliptic curve domain parameters
* Copyright (C) 2017 J08nY
*/
#include "cli.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_APPEND = 'a',
OPT_PRIME = 'p',
OPT_OUTPUT = 'o',
OPT_INPUT = 'i',
OPT_RANDOM = 'r',
OPT_FP = 1,
OPT_F2M = 2,
};
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."},
// Other
{"data-dir", OPT_DATADIR, "DIR", 0,
"PARI/GP data directory (containing seadata and elldata)."},
{"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}};
error_t parse_opt(int key, char *arg, struct argp_state *state) {
struct arguments *args = state->input;
switch (key) {
case OPT_DATADIR:
args->datadir = arg;
break;
case OPT_INPUT:
args->input = arg;
break;
case OPT_OUTPUT:
args->output = arg;
break;
case OPT_APPEND:
args->append = true;
break;
case OPT_RANDOM:
args->random = true;
break;
case OPT_PRIME:
args->prime = true;
break;
case OPT_FP:
if (args->binary_field) {
argp_failure(
state, 1, 0,
"Either specify prime field or binary field, not both.");
}
args->field = FIELD_PRIME;
args->prime_field = true;
break;
case OPT_F2M:
if (args->prime_field) {
argp_failure(
state, 1, 0,
"Either specify binary field or prime field, not both.");
}
args->field = FIELD_BINARY;
args->binary_field = true;
break;
case ARGP_KEY_ARG:
if (state->arg_num >= 1) {
argp_usage(state);
}
args->bits = strtol(arg, NULL, 10);
break;
case ARGP_KEY_END:
if (!args->prime_field && !args->binary_field) {
argp_failure(
state, 1, 0,
"Specify field type, prime or binary, with --fp / --f2m.");
}
break;
case ARGP_KEY_NO_ARGS:
argp_usage(state);
break;
default:
return ARGP_ERR_UNKNOWN;
}
return 0;
}
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