crypto/openssl/apps/ecparam.c

   1 /*
   2  * Copyright 2002-2022 The OpenSSL Project Authors. All Rights Reserved.
   3  * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
   4  *
   5  * Licensed under the Apache License 2.0 (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
   9  */
  10
  11 #include <string.h>
  12 #include <openssl/opensslconf.h>
  13 #include <openssl/evp.h>
  14 #include <openssl/encoder.h>
  15 #include <openssl/decoder.h>
  16 #include <openssl/core_names.h>
  17 #include <openssl/core_dispatch.h>
  18 #include <openssl/params.h>
  19 #include <openssl/err.h>
  20 #include "apps.h"
  21 #include "progs.h"
  22 #include "ec_common.h"
  23
  24 typedef enum OPTION_choice {
  25     OPT_COMMON,
  26     OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT, OPT_TEXT,
  27     OPT_CHECK, OPT_LIST_CURVES, OPT_NO_SEED, OPT_NOOUT, OPT_NAME,
  28     OPT_CONV_FORM, OPT_PARAM_ENC, OPT_GENKEY, OPT_ENGINE, OPT_CHECK_NAMED,
  29     OPT_R_ENUM, OPT_PROV_ENUM
  30 } OPTION_CHOICE;
  31
  32 const OPTIONS ecparam_options[] = {
  33     OPT_SECTION("General"),
  34     {"help", OPT_HELP, '-', "Display this summary"},
  35     {"list_curves", OPT_LIST_CURVES, '-',
  36      "Prints a list of all curve 'short names'"},
  37 #ifndef OPENSSL_NO_ENGINE
  38     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
  39 #endif
  40
  41     {"genkey", OPT_GENKEY, '-', "Generate ec key"},
  42     {"in", OPT_IN, '<', "Input file  - default stdin"},
  43     {"inform", OPT_INFORM, 'F', "Input format - default PEM (DER or PEM)"},
  44     {"out", OPT_OUT, '>', "Output file - default stdout"},
  45     {"outform", OPT_OUTFORM, 'F', "Output format - default PEM"},
  46
  47     OPT_SECTION("Output"),
  48     {"text", OPT_TEXT, '-', "Print the ec parameters in text form"},
  49     {"noout", OPT_NOOUT, '-', "Do not print the ec parameter"},
  50     {"param_enc", OPT_PARAM_ENC, 's',
  51      "Specifies the way the ec parameters are encoded"},
  52
  53     OPT_SECTION("Parameter"),
  54     {"check", OPT_CHECK, '-', "Validate the ec parameters"},
  55     {"check_named", OPT_CHECK_NAMED, '-',
  56      "Check that named EC curve parameters have not been modified"},
  57     {"no_seed", OPT_NO_SEED, '-',
  58      "If 'explicit' parameters are chosen do not use the seed"},
  59     {"name", OPT_NAME, 's',
  60      "Use the ec parameters with specified 'short name'"},
  61     {"conv_form", OPT_CONV_FORM, 's', "Specifies the point conversion form "},
  62
  63     OPT_R_OPTIONS,
  64     OPT_PROV_OPTIONS,
  65     {NULL}
  66 };
  67
  68 static int list_builtin_curves(BIO *out)
  69 {
  70     int ret = 0;
  71     EC_builtin_curve *curves = NULL;
  72     size_t n, crv_len = EC_get_builtin_curves(NULL, 0);
  73
  74     curves = app_malloc((int)sizeof(*curves) * crv_len, "list curves");
  75     if (!EC_get_builtin_curves(curves, crv_len))
  76         goto end;
  77
  78     for (n = 0; n < crv_len; n++) {
  79         const char *comment = curves[n].comment;
  80         const char *sname = OBJ_nid2sn(curves[n].nid);
  81
  82         if (comment == NULL)
  83             comment = "CURVE DESCRIPTION NOT AVAILABLE";
  84         if (sname == NULL)
  85             sname = "";
  86
  87         BIO_printf(out, "  %-10s: ", sname);
  88         BIO_printf(out, "%s\n", comment);
  89     }
  90     ret = 1;
  91 end:
  92     OPENSSL_free(curves);
  93     return ret;
  94 }
  95
  96 int ecparam_main(int argc, char **argv)
  97 {
  98     EVP_PKEY_CTX *gctx_params = NULL, *gctx_key = NULL, *pctx = NULL;
  99     EVP_PKEY *params_key = NULL, *key = NULL;
 100     OSSL_ENCODER_CTX *ectx_key = NULL, *ectx_params = NULL;
 101     OSSL_DECODER_CTX *dctx_params = NULL;
 102     ENGINE *e = NULL;
 103     BIO *out = NULL;
 104     char *curve_name = NULL;
 105     char *asn1_encoding = NULL;
 106     char *point_format = NULL;
 107     char *infile = NULL, *outfile = NULL, *prog;
 108     OPTION_CHOICE o;
 109     int informat = FORMAT_PEM, outformat = FORMAT_PEM, noout = 0;
 110     int ret = 1, private = 0;
 111     int no_seed = 0, check = 0, check_named = 0, text = 0, genkey = 0;
 112     int list_curves = 0;
 113
 114     prog = opt_init(argc, argv, ecparam_options);
 115     while ((o = opt_next()) != OPT_EOF) {
 116         switch (o) {
 117         case OPT_EOF:
 118         case OPT_ERR:
 119  opthelp:
 120             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 121             goto end;
 122         case OPT_HELP:
 123             opt_help(ecparam_options);
 124             ret = 0;
 125             goto end;
 126         case OPT_INFORM:
 127             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
 128                 goto opthelp;
 129             break;
 130         case OPT_IN:
 131             infile = opt_arg();
 132             break;
 133         case OPT_OUTFORM:
 134             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
 135                 goto opthelp;
 136             break;
 137         case OPT_OUT:
 138             outfile = opt_arg();
 139             break;
 140         case OPT_TEXT:
 141             text = 1;
 142             break;
 143         case OPT_CHECK:
 144             check = 1;
 145             break;
 146         case OPT_CHECK_NAMED:
 147             check_named = 1;
 148             break;
 149         case OPT_LIST_CURVES:
 150             list_curves = 1;
 151             break;
 152         case OPT_NO_SEED:
 153             no_seed = 1;
 154             break;
 155         case OPT_NOOUT:
 156             noout = 1;
 157             break;
 158         case OPT_NAME:
 159             curve_name = opt_arg();
 160             break;
 161         case OPT_CONV_FORM:
 162             point_format = opt_arg();
 163             if (!opt_string(point_format, point_format_options))
 164                 goto opthelp;
 165             break;
 166         case OPT_PARAM_ENC:
 167             asn1_encoding = opt_arg();
 168             if (!opt_string(asn1_encoding, asn1_encoding_options))
 169                 goto opthelp;
 170             break;
 171         case OPT_GENKEY:
 172             genkey = 1;
 173             break;
 174         case OPT_R_CASES:
 175             if (!opt_rand(o))
 176                 goto end;
 177             break;
 178         case OPT_PROV_CASES:
 179             if (!opt_provider(o))
 180                 goto end;
 181             break;
 182         case OPT_ENGINE:
 183             e = setup_engine(opt_arg(), 0);
 184             break;
 185         }
 186     }
 187
 188     /* No extra args. */
 189     argc = opt_num_rest();
 190     if (argc != 0)
 191         goto opthelp;
 192
 193     if (!app_RAND_load())
 194         goto end;
 195
 196     private = genkey ? 1 : 0;
 197
 198     out = bio_open_owner(outfile, outformat, private);
 199     if (out == NULL)
 200         goto end;
 201
 202     if (list_curves) {
 203         if (list_builtin_curves(out))
 204             ret = 0;
 205         goto end;
 206     }
 207
 208     if (curve_name != NULL) {
 209         OSSL_PARAM params[4];
 210         OSSL_PARAM *p = params;
 211
 212         if (strcmp(curve_name, "secp192r1") == 0) {
 213             BIO_printf(bio_err,
 214                        "using curve name prime192v1 instead of secp192r1\n");
 215             curve_name = SN_X9_62_prime192v1;
 216         } else if (strcmp(curve_name, "secp256r1") == 0) {
 217             BIO_printf(bio_err,
 218                        "using curve name prime256v1 instead of secp256r1\n");
 219             curve_name = SN_X9_62_prime256v1;
 220         }
 221         *p++ = OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_GROUP_NAME,
 222                                                 curve_name, 0);
 223         if (asn1_encoding != NULL)
 224             *p++ = OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_EC_ENCODING,
 225                                                     asn1_encoding, 0);
 226         if (point_format != NULL)
 227             *p++ = OSSL_PARAM_construct_utf8_string(
 228                        OSSL_PKEY_PARAM_EC_POINT_CONVERSION_FORMAT,
 229                        point_format, 0);
 230         *p = OSSL_PARAM_construct_end();
 231
 232         if (OPENSSL_strcasecmp(curve_name, "SM2") == 0)
 233             gctx_params = EVP_PKEY_CTX_new_from_name(app_get0_libctx(), "sm2",
 234                                                      app_get0_propq());
 235         else
 236             gctx_params = EVP_PKEY_CTX_new_from_name(app_get0_libctx(), "ec",
 237                                                      app_get0_propq());
 238         if (gctx_params == NULL
 239             || EVP_PKEY_keygen_init(gctx_params) <= 0
 240             || EVP_PKEY_CTX_set_params(gctx_params, params) <= 0
 241             || EVP_PKEY_keygen(gctx_params, &params_key) <= 0) {
 242             BIO_printf(bio_err, "unable to generate key\n");
 243             goto end;
 244         }
 245     } else {
 246         params_key = load_keyparams(infile, informat, 1, "EC", "EC parameters");
 247         if (params_key == NULL || !EVP_PKEY_is_a(params_key, "EC"))
 248             goto end;
 249         if (point_format
 250             && !EVP_PKEY_set_utf8_string_param(
 251                     params_key, OSSL_PKEY_PARAM_EC_POINT_CONVERSION_FORMAT,
 252                     point_format)) {
 253             BIO_printf(bio_err, "unable to set point conversion format\n");
 254             goto end;
 255         }
 256
 257         if (asn1_encoding != NULL
 258             && !EVP_PKEY_set_utf8_string_param(
 259                     params_key, OSSL_PKEY_PARAM_EC_ENCODING, asn1_encoding)) {
 260             BIO_printf(bio_err, "unable to set asn1 encoding format\n");
 261             goto end;
 262         }
 263     }
 264
 265     if (no_seed
 266         && !EVP_PKEY_set_octet_string_param(params_key, OSSL_PKEY_PARAM_EC_SEED,
 267                                             NULL, 0)) {
 268         BIO_printf(bio_err, "unable to clear seed\n");
 269         goto end;
 270     }
 271
 272     if (text
 273         && !EVP_PKEY_print_params(out, params_key, 0, NULL)) {
 274         BIO_printf(bio_err, "unable to print params\n");
 275         goto end;
 276     }
 277
 278     if (check || check_named) {
 279         BIO_printf(bio_err, "checking elliptic curve parameters: ");
 280
 281         if (check_named
 282             && !EVP_PKEY_set_utf8_string_param(params_key,
 283                                            OSSL_PKEY_PARAM_EC_GROUP_CHECK_TYPE,
 284                                            OSSL_PKEY_EC_GROUP_CHECK_NAMED)) {
 285                 BIO_printf(bio_err, "unable to set check_type\n");
 286                 goto end;
 287         }
 288         pctx = EVP_PKEY_CTX_new_from_pkey(app_get0_libctx(), params_key,
 289                                           app_get0_propq());
 290         if (pctx == NULL || EVP_PKEY_param_check(pctx) <= 0) {
 291             BIO_printf(bio_err, "failed\n");
 292             goto end;
 293         }
 294         BIO_printf(bio_err, "ok\n");
 295     }
 296
 297     if (outformat == FORMAT_ASN1 && genkey)
 298         noout = 1;
 299
 300     if (!noout) {
 301         ectx_params = OSSL_ENCODER_CTX_new_for_pkey(
 302                           params_key, OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS,
 303                           outformat == FORMAT_ASN1 ? "DER" : "PEM", NULL, NULL);
 304         if (!OSSL_ENCODER_to_bio(ectx_params, out)) {
 305             BIO_printf(bio_err, "unable to write elliptic curve parameters\n");
 306             goto end;
 307         }
 308     }
 309
 310     if (genkey) {
 311         /*
 312          * NOTE: EC keygen does not normally need to pass in the param_key
 313          * for named curves. This can be achieved using:
 314          *    gctx = EVP_PKEY_CTX_new_from_name(NULL, "EC", NULL);
 315          *    EVP_PKEY_keygen_init(gctx);
 316          *    EVP_PKEY_CTX_set_group_name(gctx, curvename);
 317          *    EVP_PKEY_keygen(gctx, &key) <= 0)
 318          */
 319         gctx_key = EVP_PKEY_CTX_new_from_pkey(app_get0_libctx(), params_key,
 320                                               app_get0_propq());
 321         if (EVP_PKEY_keygen_init(gctx_key) <= 0
 322             || EVP_PKEY_keygen(gctx_key, &key) <= 0) {
 323             BIO_printf(bio_err, "unable to generate key\n");
 324             goto end;
 325         }
 326         assert(private);
 327         ectx_key = OSSL_ENCODER_CTX_new_for_pkey(
 328                        key, OSSL_KEYMGMT_SELECT_ALL,
 329                        outformat == FORMAT_ASN1 ? "DER" : "PEM", NULL, NULL);
 330         if (!OSSL_ENCODER_to_bio(ectx_key, out)) {
 331             BIO_printf(bio_err, "unable to write elliptic "
 332                        "curve parameters\n");
 333             goto end;
 334         }
 335     }
 336
 337     ret = 0;
 338 end:
 339     if (ret != 0)
 340         ERR_print_errors(bio_err);
 341     release_engine(e);
 342     EVP_PKEY_free(params_key);
 343     EVP_PKEY_free(key);
 344     EVP_PKEY_CTX_free(pctx);
 345     EVP_PKEY_CTX_free(gctx_params);
 346     EVP_PKEY_CTX_free(gctx_key);
 347     OSSL_DECODER_CTX_free(dctx_params);
 348     OSSL_ENCODER_CTX_free(ectx_params);
 349     OSSL_ENCODER_CTX_free(ectx_key);
 350     BIO_free_all(out);
 351     return ret;
 352 }