2 * Copyright 2002-2018 The OpenSSL Project Authors. All Rights Reserved.
3 * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
5 * Licensed under the OpenSSL license (the "License"). You may not use
6 * this file except in compliance with the License. You can obtain a copy
7 * in the file LICENSE in the source distribution or at
8 * https://www.openssl.org/source/license.html
11 #include <openssl/opensslconf.h>
18 #include <openssl/bio.h>
19 #include <openssl/err.h>
20 #include <openssl/bn.h>
21 #include <openssl/ec.h>
22 #include <openssl/x509.h>
23 #include <openssl/pem.h>
25 typedef enum OPTION_choice {
26 OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
27 OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT, OPT_TEXT, OPT_C,
28 OPT_CHECK, OPT_LIST_CURVES, OPT_NO_SEED, OPT_NOOUT, OPT_NAME,
29 OPT_CONV_FORM, OPT_PARAM_ENC, OPT_GENKEY, OPT_ENGINE,
33 const OPTIONS ecparam_options[] = {
34 {"help", OPT_HELP, '-', "Display this summary"},
35 {"inform", OPT_INFORM, 'F', "Input format - default PEM (DER or PEM)"},
36 {"outform", OPT_OUTFORM, 'F', "Output format - default PEM"},
37 {"in", OPT_IN, '<', "Input file - default stdin"},
38 {"out", OPT_OUT, '>', "Output file - default stdout"},
39 {"text", OPT_TEXT, '-', "Print the ec parameters in text form"},
40 {"C", OPT_C, '-', "Print a 'C' function creating the parameters"},
41 {"check", OPT_CHECK, '-', "Validate the ec parameters"},
42 {"list_curves", OPT_LIST_CURVES, '-',
43 "Prints a list of all curve 'short names'"},
44 {"no_seed", OPT_NO_SEED, '-',
45 "If 'explicit' parameters are chosen do not use the seed"},
46 {"noout", OPT_NOOUT, '-', "Do not print the ec parameter"},
47 {"name", OPT_NAME, 's',
48 "Use the ec parameters with specified 'short name'"},
49 {"conv_form", OPT_CONV_FORM, 's', "Specifies the point conversion form "},
50 {"param_enc", OPT_PARAM_ENC, 's',
51 "Specifies the way the ec parameters are encoded"},
52 {"genkey", OPT_GENKEY, '-', "Generate ec key"},
54 #ifndef OPENSSL_NO_ENGINE
55 {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
60 static OPT_PAIR forms[] = {
61 {"compressed", POINT_CONVERSION_COMPRESSED},
62 {"uncompressed", POINT_CONVERSION_UNCOMPRESSED},
63 {"hybrid", POINT_CONVERSION_HYBRID},
67 static OPT_PAIR encodings[] = {
68 {"named_curve", OPENSSL_EC_NAMED_CURVE},
73 int ecparam_main(int argc, char **argv)
76 BIGNUM *ec_gen = NULL, *ec_order = NULL, *ec_cofactor = NULL;
77 BIGNUM *ec_p = NULL, *ec_a = NULL, *ec_b = NULL;
78 BIO *in = NULL, *out = NULL;
79 EC_GROUP *group = NULL;
80 point_conversion_form_t form = POINT_CONVERSION_UNCOMPRESSED;
81 char *curve_name = NULL;
82 char *infile = NULL, *outfile = NULL, *prog;
83 unsigned char *buffer = NULL;
85 int asn1_flag = OPENSSL_EC_NAMED_CURVE, new_asn1_flag = 0;
86 int informat = FORMAT_PEM, outformat = FORMAT_PEM, noout = 0, C = 0;
87 int ret = 1, private = 0;
88 int list_curves = 0, no_seed = 0, check = 0, new_form = 0;
89 int text = 0, i, genkey = 0;
91 prog = opt_init(argc, argv, ecparam_options);
92 while ((o = opt_next()) != OPT_EOF) {
97 BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
100 opt_help(ecparam_options);
104 if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
111 if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
126 case OPT_LIST_CURVES:
136 curve_name = opt_arg();
139 if (!opt_pair(opt_arg(), forms, &new_form))
145 if (!opt_pair(opt_arg(), encodings, &asn1_flag))
157 e = setup_engine(opt_arg(), 0);
161 argc = opt_num_rest();
165 private = genkey ? 1 : 0;
167 in = bio_open_default(infile, 'r', informat);
170 out = bio_open_owner(outfile, outformat, private);
175 EC_builtin_curve *curves = NULL;
176 size_t crv_len = EC_get_builtin_curves(NULL, 0);
179 curves = app_malloc((int)sizeof(*curves) * crv_len, "list curves");
180 if (!EC_get_builtin_curves(curves, crv_len)) {
181 OPENSSL_free(curves);
185 for (n = 0; n < crv_len; n++) {
188 comment = curves[n].comment;
189 sname = OBJ_nid2sn(curves[n].nid);
191 comment = "CURVE DESCRIPTION NOT AVAILABLE";
195 BIO_printf(out, " %-10s: ", sname);
196 BIO_printf(out, "%s\n", comment);
199 OPENSSL_free(curves);
204 if (curve_name != NULL) {
208 * workaround for the SECG curve names secp192r1 and secp256r1 (which
209 * are the same as the curves prime192v1 and prime256v1 defined in
212 if (strcmp(curve_name, "secp192r1") == 0) {
213 BIO_printf(bio_err, "using curve name prime192v1 "
214 "instead of secp192r1\n");
215 nid = NID_X9_62_prime192v1;
216 } else if (strcmp(curve_name, "secp256r1") == 0) {
217 BIO_printf(bio_err, "using curve name prime256v1 "
218 "instead of secp256r1\n");
219 nid = NID_X9_62_prime256v1;
221 nid = OBJ_sn2nid(curve_name);
225 nid = EC_curve_nist2nid(curve_name);
228 BIO_printf(bio_err, "unknown curve name (%s)\n", curve_name);
232 group = EC_GROUP_new_by_curve_name(nid);
234 BIO_printf(bio_err, "unable to create curve (%s)\n", curve_name);
237 EC_GROUP_set_asn1_flag(group, asn1_flag);
238 EC_GROUP_set_point_conversion_form(group, form);
239 } else if (informat == FORMAT_ASN1) {
240 group = d2i_ECPKParameters_bio(in, NULL);
242 group = PEM_read_bio_ECPKParameters(in, NULL, NULL, NULL);
245 BIO_printf(bio_err, "unable to load elliptic curve parameters\n");
246 ERR_print_errors(bio_err);
251 EC_GROUP_set_point_conversion_form(group, form);
254 EC_GROUP_set_asn1_flag(group, asn1_flag);
257 EC_GROUP_set_seed(group, NULL, 0);
261 if (!ECPKParameters_print(out, group, 0))
266 BIO_printf(bio_err, "checking elliptic curve parameters: ");
267 if (!EC_GROUP_check(group, NULL)) {
268 BIO_printf(bio_err, "failed\n");
269 ERR_print_errors(bio_err);
272 BIO_printf(bio_err, "ok\n");
277 size_t buf_len = 0, tmp_len = 0;
278 const EC_POINT *point;
279 int is_prime, len = 0;
280 const EC_METHOD *meth = EC_GROUP_method_of(group);
282 if ((ec_p = BN_new()) == NULL
283 || (ec_a = BN_new()) == NULL
284 || (ec_b = BN_new()) == NULL
285 || (ec_gen = BN_new()) == NULL
286 || (ec_order = BN_new()) == NULL
287 || (ec_cofactor = BN_new()) == NULL) {
288 perror("Can't allocate BN");
292 is_prime = (EC_METHOD_get_field_type(meth) == NID_X9_62_prime_field);
294 BIO_printf(bio_err, "Can only handle X9.62 prime fields\n");
298 if (!EC_GROUP_get_curve(group, ec_p, ec_a, ec_b, NULL))
301 if ((point = EC_GROUP_get0_generator(group)) == NULL)
303 if (!EC_POINT_point2bn(group, point,
304 EC_GROUP_get_point_conversion_form(group),
307 if (!EC_GROUP_get_order(group, ec_order, NULL))
309 if (!EC_GROUP_get_cofactor(group, ec_cofactor, NULL))
312 if (!ec_p || !ec_a || !ec_b || !ec_gen || !ec_order || !ec_cofactor)
315 len = BN_num_bits(ec_order);
317 if ((tmp_len = (size_t)BN_num_bytes(ec_p)) > buf_len)
319 if ((tmp_len = (size_t)BN_num_bytes(ec_a)) > buf_len)
321 if ((tmp_len = (size_t)BN_num_bytes(ec_b)) > buf_len)
323 if ((tmp_len = (size_t)BN_num_bytes(ec_gen)) > buf_len)
325 if ((tmp_len = (size_t)BN_num_bytes(ec_order)) > buf_len)
327 if ((tmp_len = (size_t)BN_num_bytes(ec_cofactor)) > buf_len)
330 buffer = app_malloc(buf_len, "BN buffer");
332 BIO_printf(out, "EC_GROUP *get_ec_group_%d(void)\n{\n", len);
333 print_bignum_var(out, ec_p, "ec_p", len, buffer);
334 print_bignum_var(out, ec_a, "ec_a", len, buffer);
335 print_bignum_var(out, ec_b, "ec_b", len, buffer);
336 print_bignum_var(out, ec_gen, "ec_gen", len, buffer);
337 print_bignum_var(out, ec_order, "ec_order", len, buffer);
338 print_bignum_var(out, ec_cofactor, "ec_cofactor", len, buffer);
339 BIO_printf(out, " int ok = 0;\n"
340 " EC_GROUP *group = NULL;\n"
341 " EC_POINT *point = NULL;\n"
342 " BIGNUM *tmp_1 = NULL;\n"
343 " BIGNUM *tmp_2 = NULL;\n"
344 " BIGNUM *tmp_3 = NULL;\n"
347 BIO_printf(out, " if ((tmp_1 = BN_bin2bn(ec_p_%d, sizeof(ec_p_%d), NULL)) == NULL)\n"
348 " goto err;\n", len, len);
349 BIO_printf(out, " if ((tmp_2 = BN_bin2bn(ec_a_%d, sizeof(ec_a_%d), NULL)) == NULL)\n"
350 " goto err;\n", len, len);
351 BIO_printf(out, " if ((tmp_3 = BN_bin2bn(ec_b_%d, sizeof(ec_b_%d), NULL)) == NULL)\n"
352 " goto err;\n", len, len);
353 BIO_printf(out, " if ((group = EC_GROUP_new_curve_GFp(tmp_1, tmp_2, tmp_3, NULL)) == NULL)\n"
356 BIO_printf(out, " /* build generator */\n");
357 BIO_printf(out, " if ((tmp_1 = BN_bin2bn(ec_gen_%d, sizeof(ec_gen_%d), tmp_1)) == NULL)\n"
358 " goto err;\n", len, len);
359 BIO_printf(out, " point = EC_POINT_bn2point(group, tmp_1, NULL, NULL);\n");
360 BIO_printf(out, " if (point == NULL)\n"
362 BIO_printf(out, " if ((tmp_2 = BN_bin2bn(ec_order_%d, sizeof(ec_order_%d), tmp_2)) == NULL)\n"
363 " goto err;\n", len, len);
364 BIO_printf(out, " if ((tmp_3 = BN_bin2bn(ec_cofactor_%d, sizeof(ec_cofactor_%d), tmp_3)) == NULL)\n"
365 " goto err;\n", len, len);
366 BIO_printf(out, " if (!EC_GROUP_set_generator(group, point, tmp_2, tmp_3))\n"
370 BIO_printf(out, "err:\n"
374 " EC_POINT_free(point);\n"
376 " EC_GROUP_free(group);\n"
383 if (outformat == FORMAT_ASN1 && genkey)
387 if (outformat == FORMAT_ASN1)
388 i = i2d_ECPKParameters_bio(out, group);
390 i = PEM_write_bio_ECPKParameters(out, group);
392 BIO_printf(bio_err, "unable to write elliptic "
393 "curve parameters\n");
394 ERR_print_errors(bio_err);
400 EC_KEY *eckey = EC_KEY_new();
405 if (EC_KEY_set_group(eckey, group) == 0) {
406 BIO_printf(bio_err, "unable to set group when generating key\n");
408 ERR_print_errors(bio_err);
413 EC_KEY_set_conv_form(eckey, form);
415 if (!EC_KEY_generate_key(eckey)) {
416 BIO_printf(bio_err, "unable to generate key\n");
418 ERR_print_errors(bio_err);
422 if (outformat == FORMAT_ASN1)
423 i = i2d_ECPrivateKey_bio(out, eckey);
425 i = PEM_write_bio_ECPrivateKey(out, eckey, NULL,
426 NULL, 0, NULL, NULL);
437 BN_free(ec_cofactor);
438 OPENSSL_free(buffer);
439 EC_GROUP_free(group);