apps/ecparam.c

   1 /*
   2  * Copyright 2002-2017 The OpenSSL Project Authors. All Rights Reserved.
   3  * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
   4  *
   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
   9  */
  10
  11 #include <openssl/opensslconf.h>
  12 #ifdef OPENSSL_NO_EC
  13 NON_EMPTY_TRANSLATION_UNIT
  14 #else
  15
  16 # include <stdio.h>
  17 # include <stdlib.h>
  18 # include <time.h>
  19 # include <string.h>
  20 # include "apps.h"
  21 # include <openssl/bio.h>
  22 # include <openssl/err.h>
  23 # include <openssl/bn.h>
  24 # include <openssl/ec.h>
  25 # include <openssl/x509.h>
  26 # include <openssl/pem.h>
  27
  28 typedef enum OPTION_choice {
  29     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  30     OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT, OPT_TEXT, OPT_C,
  31     OPT_CHECK, OPT_LIST_CURVES, OPT_NO_SEED, OPT_NOOUT, OPT_NAME,
  32     OPT_CONV_FORM, OPT_PARAM_ENC, OPT_GENKEY, OPT_ENGINE,
  33     OPT_R_ENUM
  34 } OPTION_CHOICE;
  35
  36 const OPTIONS ecparam_options[] = {
  37     {"help", OPT_HELP, '-', "Display this summary"},
  38     {"inform", OPT_INFORM, 'F', "Input format - default PEM (DER or PEM)"},
  39     {"outform", OPT_OUTFORM, 'F', "Output format - default PEM"},
  40     {"in", OPT_IN, '<', "Input file  - default stdin"},
  41     {"out", OPT_OUT, '>', "Output file - default stdout"},
  42     {"text", OPT_TEXT, '-', "Print the ec parameters in text form"},
  43     {"C", OPT_C, '-', "Print a 'C' function creating the parameters"},
  44     {"check", OPT_CHECK, '-', "Validate the ec parameters"},
  45     {"list_curves", OPT_LIST_CURVES, '-',
  46      "Prints a list of all curve 'short names'"},
  47     {"no_seed", OPT_NO_SEED, '-',
  48      "If 'explicit' parameters are chosen do not use the seed"},
  49     {"noout", OPT_NOOUT, '-', "Do not print the ec parameter"},
  50     {"name", OPT_NAME, 's',
  51      "Use the ec parameters with specified 'short name'"},
  52     {"conv_form", OPT_CONV_FORM, 's', "Specifies the point conversion form "},
  53     {"param_enc", OPT_PARAM_ENC, 's',
  54      "Specifies the way the ec parameters are encoded"},
  55     {"genkey", OPT_GENKEY, '-', "Generate ec key"},
  56     OPT_R_OPTIONS,
  57 # ifndef OPENSSL_NO_ENGINE
  58     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
  59 # endif
  60     {NULL}
  61 };
  62
  63 static OPT_PAIR forms[] = {
  64     {"compressed", POINT_CONVERSION_COMPRESSED},
  65     {"uncompressed", POINT_CONVERSION_UNCOMPRESSED},
  66     {"hybrid", POINT_CONVERSION_HYBRID},
  67     {NULL}
  68 };
  69
  70 static OPT_PAIR encodings[] = {
  71     {"named_curve", OPENSSL_EC_NAMED_CURVE},
  72     {"explicit", 0},
  73     {NULL}
  74 };
  75
  76 int ecparam_main(int argc, char **argv)
  77 {
  78     ENGINE *e = NULL;
  79     BIGNUM *ec_gen = NULL, *ec_order = NULL, *ec_cofactor = NULL;
  80     BIGNUM *ec_p = NULL, *ec_a = NULL, *ec_b = NULL;
  81     BIO *in = NULL, *out = NULL;
  82     EC_GROUP *group = NULL;
  83     point_conversion_form_t form = POINT_CONVERSION_UNCOMPRESSED;
  84     char *curve_name = NULL;
  85     char *infile = NULL, *outfile = NULL, *prog;
  86     unsigned char *buffer = NULL;
  87     OPTION_CHOICE o;
  88     int asn1_flag = OPENSSL_EC_NAMED_CURVE, new_asn1_flag = 0;
  89     int informat = FORMAT_PEM, outformat = FORMAT_PEM, noout = 0, C = 0;
  90     int ret = 1, private = 0;
  91     int list_curves = 0, no_seed = 0, check = 0, new_form = 0;
  92     int text = 0, i, genkey = 0;
  93
  94     prog = opt_init(argc, argv, ecparam_options);
  95     while ((o = opt_next()) != OPT_EOF) {
  96         switch (o) {
  97         case OPT_EOF:
  98         case OPT_ERR:
  99  opthelp:
 100             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 101             goto end;
 102         case OPT_HELP:
 103             opt_help(ecparam_options);
 104             ret = 0;
 105             goto end;
 106         case OPT_INFORM:
 107             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
 108                 goto opthelp;
 109             break;
 110         case OPT_IN:
 111             infile = opt_arg();
 112             break;
 113         case OPT_OUTFORM:
 114             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
 115                 goto opthelp;
 116             break;
 117         case OPT_OUT:
 118             outfile = opt_arg();
 119             break;
 120         case OPT_TEXT:
 121             text = 1;
 122             break;
 123         case OPT_C:
 124             C = 1;
 125             break;
 126         case OPT_CHECK:
 127             check = 1;
 128             break;
 129         case OPT_LIST_CURVES:
 130             list_curves = 1;
 131             break;
 132         case OPT_NO_SEED:
 133             no_seed = 1;
 134             break;
 135         case OPT_NOOUT:
 136             noout = 1;
 137             break;
 138         case OPT_NAME:
 139             curve_name = opt_arg();
 140             break;
 141         case OPT_CONV_FORM:
 142             if (!opt_pair(opt_arg(), forms, &new_form))
 143                 goto opthelp;
 144             form = new_form;
 145             new_form = 1;
 146             break;
 147         case OPT_PARAM_ENC:
 148             if (!opt_pair(opt_arg(), encodings, &asn1_flag))
 149                 goto opthelp;
 150             new_asn1_flag = 1;
 151             break;
 152         case OPT_GENKEY:
 153             genkey = 1;
 154             break;
 155         case OPT_R_CASES:
 156             if (!opt_rand(o))
 157                 goto end;
 158             break;
 159         case OPT_ENGINE:
 160             e = setup_engine(opt_arg(), 0);
 161             break;
 162         }
 163     }
 164     argc = opt_num_rest();
 165     if (argc != 0)
 166         goto opthelp;
 167
 168     private = genkey ? 1 : 0;
 169
 170     in = bio_open_default(infile, 'r', informat);
 171     if (in == NULL)
 172         goto end;
 173     out = bio_open_owner(outfile, outformat, private);
 174     if (out == NULL)
 175         goto end;
 176
 177     if (list_curves) {
 178         EC_builtin_curve *curves = NULL;
 179         size_t crv_len = EC_get_builtin_curves(NULL, 0);
 180         size_t n;
 181
 182         curves = app_malloc((int)sizeof(*curves) * crv_len, "list curves");
 183         if (!EC_get_builtin_curves(curves, crv_len)) {
 184             OPENSSL_free(curves);
 185             goto end;
 186         }
 187
 188         for (n = 0; n < crv_len; n++) {
 189             const char *comment;
 190             const char *sname;
 191             comment = curves[n].comment;
 192             sname = OBJ_nid2sn(curves[n].nid);
 193             if (comment == NULL)
 194                 comment = "CURVE DESCRIPTION NOT AVAILABLE";
 195             if (sname == NULL)
 196                 sname = "";
 197
 198             BIO_printf(out, "  %-10s: ", sname);
 199             BIO_printf(out, "%s\n", comment);
 200         }
 201
 202         OPENSSL_free(curves);
 203         ret = 0;
 204         goto end;
 205     }
 206
 207     if (curve_name != NULL) {
 208         int nid;
 209
 210         /*
 211          * workaround for the SECG curve names secp192r1 and secp256r1 (which
 212          * are the same as the curves prime192v1 and prime256v1 defined in
 213          * X9.62)
 214          */
 215         if (strcmp(curve_name, "secp192r1") == 0) {
 216             BIO_printf(bio_err, "using curve name prime192v1 "
 217                        "instead of secp192r1\n");
 218             nid = NID_X9_62_prime192v1;
 219         } else if (strcmp(curve_name, "secp256r1") == 0) {
 220             BIO_printf(bio_err, "using curve name prime256v1 "
 221                        "instead of secp256r1\n");
 222             nid = NID_X9_62_prime256v1;
 223         } else {
 224             nid = OBJ_sn2nid(curve_name);
 225         }
 226
 227         if (nid == 0)
 228             nid = EC_curve_nist2nid(curve_name);
 229
 230         if (nid == 0) {
 231             BIO_printf(bio_err, "unknown curve name (%s)\n", curve_name);
 232             goto end;
 233         }
 234
 235         group = EC_GROUP_new_by_curve_name(nid);
 236         if (group == NULL) {
 237             BIO_printf(bio_err, "unable to create curve (%s)\n", curve_name);
 238             goto end;
 239         }
 240         EC_GROUP_set_asn1_flag(group, asn1_flag);
 241         EC_GROUP_set_point_conversion_form(group, form);
 242     } else if (informat == FORMAT_ASN1) {
 243         group = d2i_ECPKParameters_bio(in, NULL);
 244     } else {
 245         group = PEM_read_bio_ECPKParameters(in, NULL, NULL, NULL);
 246     }
 247     if (group == NULL) {
 248         BIO_printf(bio_err, "unable to load elliptic curve parameters\n");
 249         ERR_print_errors(bio_err);
 250         goto end;
 251     }
 252
 253     if (new_form)
 254         EC_GROUP_set_point_conversion_form(group, form);
 255
 256     if (new_asn1_flag)
 257         EC_GROUP_set_asn1_flag(group, asn1_flag);
 258
 259     if (no_seed) {
 260         EC_GROUP_set_seed(group, NULL, 0);
 261     }
 262
 263     if (text) {
 264         if (!ECPKParameters_print(out, group, 0))
 265             goto end;
 266     }
 267
 268     if (check) {
 269         BIO_printf(bio_err, "checking elliptic curve parameters: ");
 270         if (!EC_GROUP_check(group, NULL)) {
 271             BIO_printf(bio_err, "failed\n");
 272             ERR_print_errors(bio_err);
 273             goto end;
 274         }
 275         BIO_printf(bio_err, "ok\n");
 276
 277     }
 278
 279     if (C) {
 280         size_t buf_len = 0, tmp_len = 0;
 281         const EC_POINT *point;
 282         int is_prime, len = 0;
 283         const EC_METHOD *meth = EC_GROUP_method_of(group);
 284
 285         if ((ec_p = BN_new()) == NULL
 286                 || (ec_a = BN_new()) == NULL
 287                 || (ec_b = BN_new()) == NULL
 288                 || (ec_gen = BN_new()) == NULL
 289                 || (ec_order = BN_new()) == NULL
 290                 || (ec_cofactor = BN_new()) == NULL) {
 291             perror("Can't allocate BN");
 292             goto end;
 293         }
 294
 295         is_prime = (EC_METHOD_get_field_type(meth) == NID_X9_62_prime_field);
 296         if (!is_prime) {
 297             BIO_printf(bio_err, "Can only handle X9.62 prime fields\n");
 298             goto end;
 299         }
 300
 301         if (!EC_GROUP_get_curve_GFp(group, ec_p, ec_a, ec_b, NULL))
 302             goto end;
 303
 304         if ((point = EC_GROUP_get0_generator(group)) == NULL)
 305             goto end;
 306         if (!EC_POINT_point2bn(group, point,
 307                                EC_GROUP_get_point_conversion_form(group),
 308                                ec_gen, NULL))
 309             goto end;
 310         if (!EC_GROUP_get_order(group, ec_order, NULL))
 311             goto end;
 312         if (!EC_GROUP_get_cofactor(group, ec_cofactor, NULL))
 313             goto end;
 314
 315         if (!ec_p || !ec_a || !ec_b || !ec_gen || !ec_order || !ec_cofactor)
 316             goto end;
 317
 318         len = BN_num_bits(ec_order);
 319
 320         if ((tmp_len = (size_t)BN_num_bytes(ec_p)) > buf_len)
 321             buf_len = tmp_len;
 322         if ((tmp_len = (size_t)BN_num_bytes(ec_a)) > buf_len)
 323             buf_len = tmp_len;
 324         if ((tmp_len = (size_t)BN_num_bytes(ec_b)) > buf_len)
 325             buf_len = tmp_len;
 326         if ((tmp_len = (size_t)BN_num_bytes(ec_gen)) > buf_len)
 327             buf_len = tmp_len;
 328         if ((tmp_len = (size_t)BN_num_bytes(ec_order)) > buf_len)
 329             buf_len = tmp_len;
 330         if ((tmp_len = (size_t)BN_num_bytes(ec_cofactor)) > buf_len)
 331             buf_len = tmp_len;
 332
 333         buffer = app_malloc(buf_len, "BN buffer");
 334
 335         BIO_printf(out, "EC_GROUP *get_ec_group_%d(void)\n{\n", len);
 336         print_bignum_var(out, ec_p, "ec_p", len, buffer);
 337         print_bignum_var(out, ec_a, "ec_a", len, buffer);
 338         print_bignum_var(out, ec_b, "ec_b", len, buffer);
 339         print_bignum_var(out, ec_gen, "ec_gen", len, buffer);
 340         print_bignum_var(out, ec_order, "ec_order", len, buffer);
 341         print_bignum_var(out, ec_cofactor, "ec_cofactor", len, buffer);
 342         BIO_printf(out, "    int ok = 0;\n"
 343                         "    EC_GROUP *group = NULL;\n"
 344                         "    EC_POINT *point = NULL;\n"
 345                         "    BIGNUM *tmp_1 = NULL;\n"
 346                         "    BIGNUM *tmp_2 = NULL;\n"
 347                         "    BIGNUM *tmp_3 = NULL;\n"
 348                         "\n");
 349
 350         BIO_printf(out, "    if ((tmp_1 = BN_bin2bn(ec_p_%d, sizeof (ec_p_%d), NULL)) == NULL)\n"
 351                         "        goto err;\n", len, len);
 352         BIO_printf(out, "    if ((tmp_2 = BN_bin2bn(ec_a_%d, sizeof (ec_a_%d), NULL)) == NULL)\n"
 353                         "        goto err;\n", len, len);
 354         BIO_printf(out, "    if ((tmp_3 = BN_bin2bn(ec_b_%d, sizeof (ec_b_%d), NULL)) == NULL)\n"
 355                         "        goto err;\n", len, len);
 356         BIO_printf(out, "    if ((group = EC_GROUP_new_curve_GFp(tmp_1, tmp_2, tmp_3, NULL)) == NULL)\n"
 357                         "        goto err;\n"
 358                         "\n");
 359         BIO_printf(out, "    /* build generator */\n");
 360         BIO_printf(out, "    if ((tmp_1 = BN_bin2bn(ec_gen_%d, sizeof (ec_gen_%d), tmp_1)) == NULL)\n"
 361                         "        goto err;\n", len, len);
 362         BIO_printf(out, "    point = EC_POINT_bn2point(group, tmp_1, NULL, NULL);\n");
 363         BIO_printf(out, "    if (point == NULL)\n"
 364                         "        goto err;\n");
 365         BIO_printf(out, "    if ((tmp_2 = BN_bin2bn(ec_order_%d, sizeof (ec_order_%d), tmp_2)) == NULL)\n"
 366                         "        goto err;\n", len, len);
 367         BIO_printf(out, "    if ((tmp_3 = BN_bin2bn(ec_cofactor_%d, sizeof (ec_cofactor_%d), tmp_3)) == NULL)\n"
 368                         "        goto err;\n", len, len);
 369         BIO_printf(out, "    if (!EC_GROUP_set_generator(group, point, tmp_2, tmp_3))\n"
 370                         "        goto err;\n"
 371                         "ok = 1;"
 372                         "\n");
 373         BIO_printf(out, "err:\n"
 374                         "    BN_free(tmp_1);\n"
 375                         "    BN_free(tmp_2);\n"
 376                         "    BN_free(tmp_3);\n"
 377                         "    EC_POINT_free(point);\n"
 378                         "    if (!ok) {\n"
 379                         "        EC_GROUP_free(group);\n"
 380                         "        return NULL;\n"
 381                         "    }\n"
 382                         "    return (group);\n"
 383                         "}\n");
 384     }
 385
 386     if (!noout) {
 387         if (outformat == FORMAT_ASN1)
 388             i = i2d_ECPKParameters_bio(out, group);
 389         else
 390             i = PEM_write_bio_ECPKParameters(out, group);
 391         if (!i) {
 392             BIO_printf(bio_err, "unable to write elliptic "
 393                        "curve parameters\n");
 394             ERR_print_errors(bio_err);
 395             goto end;
 396         }
 397     }
 398
 399     if (genkey) {
 400         EC_KEY *eckey = EC_KEY_new();
 401
 402         if (eckey == NULL)
 403             goto end;
 404
 405         if (EC_KEY_set_group(eckey, group) == 0) {
 406             BIO_printf(bio_err, "unable to set group when generating key\n");
 407             EC_KEY_free(eckey);
 408             ERR_print_errors(bio_err);
 409             goto end;
 410         }
 411
 412         if (!EC_KEY_generate_key(eckey)) {
 413             BIO_printf(bio_err, "unable to generate key\n");
 414             EC_KEY_free(eckey);
 415             ERR_print_errors(bio_err);
 416             goto end;
 417         }
 418         assert(private);
 419         if (outformat == FORMAT_ASN1)
 420             i = i2d_ECPrivateKey_bio(out, eckey);
 421         else
 422             i = PEM_write_bio_ECPrivateKey(out, eckey, NULL,
 423                                            NULL, 0, NULL, NULL);
 424         EC_KEY_free(eckey);
 425     }
 426
 427     ret = 0;
 428  end:
 429     BN_free(ec_p);
 430     BN_free(ec_a);
 431     BN_free(ec_b);
 432     BN_free(ec_gen);
 433     BN_free(ec_order);
 434     BN_free(ec_cofactor);
 435     OPENSSL_free(buffer);
 436     EC_GROUP_free(group);
 437     release_engine(e);
 438     BIO_free(in);
 439     BIO_free_all(out);
 440     return ret;
 441 }
 442
 443 #endif