diff options
Diffstat (limited to 'src/io/cli.c')
| -rw-r--r-- | src/io/cli.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/src/io/cli.c b/src/io/cli.c new file mode 100644 index 0000000..12ceabd --- /dev/null +++ b/src/io/cli.c @@ -0,0 +1,139 @@ +/* + * 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; +} |