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openssl/apps/ecparam.c

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/*
* Copyright 2002-2021 The OpenSSL Project Authors. All Rights Reserved.
* Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <string.h>
#include <openssl/opensslconf.h>
#include <openssl/evp.h>
#include <openssl/encoder.h>
#include <openssl/decoder.h>
#include <openssl/core_names.h>
#include <openssl/core_dispatch.h>
#include <openssl/params.h>
#include <openssl/err.h>
#include "apps.h"
#include "progs.h"
#include "ec_common.h"
typedef enum OPTION_choice {
OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT, OPT_TEXT,
OPT_CHECK, OPT_LIST_CURVES, OPT_NO_SEED, OPT_NOOUT, OPT_NAME,
OPT_CONV_FORM, OPT_PARAM_ENC, OPT_GENKEY, OPT_ENGINE, OPT_CHECK_NAMED,
OPT_R_ENUM, OPT_PROV_ENUM
} OPTION_CHOICE;
const OPTIONS ecparam_options[] = {
OPT_SECTION("General"),
{"help", OPT_HELP, '-', "Display this summary"},
{"list_curves", OPT_LIST_CURVES, '-',
"Prints a list of all curve 'short names'"},
#ifndef OPENSSL_NO_ENGINE
{"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
#endif
{"genkey", OPT_GENKEY, '-', "Generate ec key"},
{"in", OPT_IN, '<', "Input file - default stdin"},
{"inform", OPT_INFORM, 'F', "Input format - default PEM (DER or PEM)"},
{"out", OPT_OUT, '>', "Output file - default stdout"},
{"outform", OPT_OUTFORM, 'F', "Output format - default PEM"},
OPT_SECTION("Output"),
{"text", OPT_TEXT, '-', "Print the ec parameters in text form"},
{"noout", OPT_NOOUT, '-', "Do not print the ec parameter"},
{"param_enc", OPT_PARAM_ENC, 's',
"Specifies the way the ec parameters are encoded"},
OPT_SECTION("Parameter"),
{"check", OPT_CHECK, '-', "Validate the ec parameters"},
{"check_named", OPT_CHECK_NAMED, '-',
"Check that named EC curve parameters have not been modified"},
{"no_seed", OPT_NO_SEED, '-',
"If 'explicit' parameters are chosen do not use the seed"},
{"name", OPT_NAME, 's',
"Use the ec parameters with specified 'short name'"},
{"conv_form", OPT_CONV_FORM, 's', "Specifies the point conversion form "},
OPT_R_OPTIONS,
OPT_PROV_OPTIONS,
{NULL}
};
static int list_builtin_curves(BIO *out)
{
int ret = 0;
EC_builtin_curve *curves = NULL;
size_t n, crv_len = EC_get_builtin_curves(NULL, 0);
curves = app_malloc((int)sizeof(*curves) * crv_len, "list curves");
if (!EC_get_builtin_curves(curves, crv_len))
goto end;
for (n = 0; n < crv_len; n++) {
const char *comment = curves[n].comment;
const char *sname = OBJ_nid2sn(curves[n].nid);
if (comment == NULL)
comment = "CURVE DESCRIPTION NOT AVAILABLE";
if (sname == NULL)
sname = "";
BIO_printf(out, " %-10s: ", sname);
BIO_printf(out, "%s\n", comment);
}
ret = 1;
end:
OPENSSL_free(curves);
return ret;
}
int ecparam_main(int argc, char **argv)
{
EVP_PKEY_CTX *gctx_params = NULL, *gctx_key = NULL, *pctx = NULL;
EVP_PKEY *params_key = NULL, *key = NULL;
OSSL_ENCODER_CTX *ectx_key = NULL, *ectx_params = NULL;
OSSL_DECODER_CTX *dctx_params = NULL;
ENGINE *e = NULL;
BIO *in = NULL, *out = NULL;
char *curve_name = NULL;
char *asn1_encoding = NULL;
char *point_format = NULL;
char *infile = NULL, *outfile = NULL, *prog;
OPTION_CHOICE o;
int informat = FORMAT_PEM, outformat = FORMAT_PEM, noout = 0;
int ret = 1, private = 0;
int no_seed = 0, check = 0, check_named = 0, text = 0, genkey = 0;
int list_curves = 0;
prog = opt_init(argc, argv, ecparam_options);
while ((o = opt_next()) != OPT_EOF) {
switch (o) {
case OPT_EOF:
case OPT_ERR:
opthelp:
BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
goto end;
case OPT_HELP:
opt_help(ecparam_options);
ret = 0;
goto end;
case OPT_INFORM:
if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
goto opthelp;
break;
case OPT_IN:
infile = opt_arg();
break;
case OPT_OUTFORM:
if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
goto opthelp;
break;
case OPT_OUT:
outfile = opt_arg();
break;
case OPT_TEXT:
text = 1;
break;
case OPT_CHECK:
check = 1;
break;
case OPT_CHECK_NAMED:
check_named = 1;
break;
case OPT_LIST_CURVES:
list_curves = 1;
break;
case OPT_NO_SEED:
no_seed = 1;
break;
case OPT_NOOUT:
noout = 1;
break;
case OPT_NAME:
curve_name = opt_arg();
break;
case OPT_CONV_FORM:
point_format = opt_arg();
if (!opt_string(point_format, point_format_options))
goto opthelp;
break;
case OPT_PARAM_ENC:
asn1_encoding = opt_arg();
if (!opt_string(asn1_encoding, asn1_encoding_options))
goto opthelp;
break;
case OPT_GENKEY:
genkey = 1;
break;
case OPT_R_CASES:
if (!opt_rand(o))
goto end;
break;
case OPT_PROV_CASES:
if (!opt_provider(o))
goto end;
break;
case OPT_ENGINE:
e = setup_engine(opt_arg(), 0);
break;
}
}
/* No extra args. */
argc = opt_num_rest();
if (argc != 0)
goto opthelp;
app_RAND_load();
private = genkey ? 1 : 0;
in = bio_open_default(infile, 'r', informat);
if (in == NULL)
goto end;
out = bio_open_owner(outfile, outformat, private);
if (out == NULL)
goto end;
if (list_curves) {
if (list_builtin_curves(out))
ret = 0;
goto end;
}
if (curve_name != NULL) {
OSSL_PARAM params[4];
OSSL_PARAM *p = params;
if (strcmp(curve_name, "secp192r1") == 0) {
BIO_printf(bio_err,
"using curve name prime192v1 instead of secp192r1\n");
curve_name = SN_X9_62_prime192v1;
} else if (strcmp(curve_name, "secp256r1") == 0) {
BIO_printf(bio_err,
"using curve name prime256v1 instead of secp256r1\n");
curve_name = SN_X9_62_prime256v1;
}
*p++ = OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_GROUP_NAME,
curve_name, 0);
if (asn1_encoding != NULL)
*p++ = OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_EC_ENCODING,
asn1_encoding, 0);
if (point_format != NULL)
*p++ = OSSL_PARAM_construct_utf8_string(
OSSL_PKEY_PARAM_EC_POINT_CONVERSION_FORMAT,
point_format, 0);
*p = OSSL_PARAM_construct_end();
gctx_params = EVP_PKEY_CTX_new_from_name(NULL, "ec", NULL);
if (gctx_params == NULL
|| EVP_PKEY_keygen_init(gctx_params) <= 0
|| EVP_PKEY_CTX_set_params(gctx_params, params) <= 0
|| EVP_PKEY_keygen(gctx_params, &params_key) <= 0) {
BIO_printf(bio_err, "unable to generate key\n");
goto end;
}
} else {
params_key = load_keyparams(infile, 1, "EC", "EC parameters");
if (params_key == NULL || !EVP_PKEY_is_a(params_key, "EC"))
goto end;
if (point_format
&& !EVP_PKEY_set_utf8_string_param(
params_key, OSSL_PKEY_PARAM_EC_POINT_CONVERSION_FORMAT,
point_format)) {
BIO_printf(bio_err, "unable to set point conversion format\n");
goto end;
}
if (asn1_encoding != NULL
&& !EVP_PKEY_set_utf8_string_param(
params_key, OSSL_PKEY_PARAM_EC_ENCODING, asn1_encoding)) {
BIO_printf(bio_err, "unable to set asn1 encoding format\n");
goto end;
}
}
if (no_seed
&& !EVP_PKEY_set_octet_string_param(params_key, OSSL_PKEY_PARAM_EC_SEED,
NULL, 0)) {
BIO_printf(bio_err, "unable to clear seed\n");
goto end;
}
if (text
&& !EVP_PKEY_print_params(out, params_key, 0, NULL)) {
BIO_printf(bio_err, "unable to print params\n");
goto end;
}
if (check || check_named) {
BIO_printf(bio_err, "checking elliptic curve parameters: ");
if (check_named
&& !EVP_PKEY_set_utf8_string_param(params_key,
OSSL_PKEY_PARAM_EC_GROUP_CHECK_TYPE,
OSSL_PKEY_EC_GROUP_CHECK_NAMED)) {
BIO_printf(bio_err, "unable to set check_type\n");
goto end;
}
pctx = EVP_PKEY_CTX_new_from_pkey(NULL, params_key, NULL);
if (pctx == NULL || !EVP_PKEY_param_check(pctx)) {
BIO_printf(bio_err, "failed\n");
goto end;
}
BIO_printf(bio_err, "ok\n");
}
if (outformat == FORMAT_ASN1 && genkey)
noout = 1;
if (!noout) {
ectx_params = OSSL_ENCODER_CTX_new_by_EVP_PKEY(
params_key, OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS,
outformat == FORMAT_ASN1 ? "DER" : "PEM", NULL, NULL);
if (!OSSL_ENCODER_to_bio(ectx_params, out)) {
BIO_printf(bio_err, "unable to write elliptic curve parameters\n");
goto end;
}
}
if (genkey) {
/*
* NOTE: EC keygen does not normally need to pass in the param_key
* for named curves. This can be achieved using:
* gctx = EVP_PKEY_CTX_new_from_name(NULL, "EC", NULL);
* EVP_PKEY_keygen_init(gctx);
* EVP_PKEY_CTX_set_group_name(gctx, curvename);
* EVP_PKEY_keygen(gctx, &key) <= 0)
*/
gctx_key = EVP_PKEY_CTX_new_from_pkey(NULL, params_key, NULL);
if (EVP_PKEY_keygen_init(gctx_key) <= 0
|| EVP_PKEY_keygen(gctx_key, &key) <= 0) {
BIO_printf(bio_err, "unable to generate key\n");
goto end;
}
assert(private);
ectx_key = OSSL_ENCODER_CTX_new_by_EVP_PKEY(
key, OSSL_KEYMGMT_SELECT_ALL,
outformat == FORMAT_ASN1 ? "DER" : "PEM", NULL, NULL);
if (!OSSL_ENCODER_to_bio(ectx_key, out)) {
BIO_printf(bio_err, "unable to write elliptic "
"curve parameters\n");
goto end;
}
}
ret = 0;
end:
if (ret != 0)
ERR_print_errors(bio_err);
release_engine(e);
EVP_PKEY_free(params_key);
EVP_PKEY_free(key);
EVP_PKEY_CTX_free(pctx);
EVP_PKEY_CTX_free(gctx_params);
EVP_PKEY_CTX_free(gctx_key);
OSSL_DECODER_CTX_free(dctx_params);
OSSL_ENCODER_CTX_free(ectx_params);
OSSL_ENCODER_CTX_free(ectx_key);
BIO_free(in);
BIO_free_all(out);
return ret;
}
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