text: /*
   * Copyright 2002-2016 The OpenSSL Project Authors. All Rights Reserved.
   *
   * Licensed under the OpenSSL license (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
   */
  
  /* ====================================================================
   * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
   *
   * Portions of the attached software ("Contribution") are developed by
   * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
   *
   * The Contribution is licensed pursuant to the OpenSSL open source
   * license provided above.
   *
   * The elliptic curve binary polynomial software is originally written by
   * Sheueling Chang Shantz and Douglas Stebila of Sun Microsystems Laboratories.
   *
   */
  
  #include <openssl/opensslconf.h>
  #ifdef OPENSSL_NO_EC
  NON_EMPTY_TRANSLATION_UNIT
  #else
  
  # include <stdio.h>
  # include <stdlib.h>
  # include <time.h>
  # include <string.h>
  # include "apps.h"
  # include <openssl/bio.h>
  # include <openssl/err.h>
  # include <openssl/bn.h>
  # include <openssl/ec.h>
  # include <openssl/x509.h>
  # include <openssl/pem.h>
  
  typedef enum OPTION_choice {
      OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
      OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT, OPT_TEXT, OPT_C,
      OPT_CHECK, OPT_LIST_CURVES, OPT_NO_SEED, OPT_NOOUT, OPT_NAME,
      OPT_CONV_FORM, OPT_PARAM_ENC, OPT_GENKEY, OPT_RAND, OPT_ENGINE
  } OPTION_CHOICE;
  
  const OPTIONS ecparam_options[] = {
      {"help", OPT_HELP, '-', "Display this summary"},
      {"inform", OPT_INFORM, 'F', "Input format - default PEM (DER or PEM)"},
      {"outform", OPT_OUTFORM, 'F', "Output format - default PEM"},
      {"in", OPT_IN, '<', "Input file  - default stdin"},
      {"out", OPT_OUT, '>', "Output file - default stdout"},
      {"text", OPT_TEXT, '-', "Print the ec parameters in text form"},
      {"C", OPT_C, '-', "Print a 'C' function creating the parameters"},
      {"check", OPT_CHECK, '-', "Validate the ec parameters"},
      {"list_curves", OPT_LIST_CURVES, '-',
       "Prints a list of all curve 'short names'"},
      {"no_seed", OPT_NO_SEED, '-',
       "If 'explicit' parameters are chosen do not use the seed"},
      {"noout", OPT_NOOUT, '-', "Do not print the ec parameter"},
      {"name", OPT_NAME, 's',
       "Use the ec parameters with specified 'short name'"},
      {"conv_form", OPT_CONV_FORM, 's', "Specifies the point conversion form "},
      {"param_enc", OPT_PARAM_ENC, 's',
       "Specifies the way the ec parameters are encoded"},
      {"genkey", OPT_GENKEY, '-', "Generate ec key"},
      {"rand", OPT_RAND, 's', "Files to use for random number input"},
  # ifndef OPENSSL_NO_ENGINE
      {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
  # endif
      {NULL}
  };
  
  static OPT_PAIR forms[] = {
      {"compressed", POINT_CONVERSION_COMPRESSED},
      {"uncompressed", POINT_CONVERSION_UNCOMPRESSED},
      {"hybrid", POINT_CONVERSION_HYBRID},
      {NULL}
  };
  
  static OPT_PAIR encodings[] = {
      {"named_curve", OPENSSL_EC_NAMED_CURVE},
      {"explicit", 0},
      {NULL}
  };
  
  int ecparam_main(int argc, char **argv)
  {
      BIGNUM *ec_gen = NULL, *ec_order = NULL, *ec_cofactor = NULL;
      BIGNUM *ec_p = NULL, *ec_a = NULL, *ec_b = NULL;
      BIO *in = NULL, *out = NULL;
      EC_GROUP *group = NULL;
      point_conversion_form_t form = POINT_CONVERSION_UNCOMPRESSED;
      char *curve_name = NULL, *inrand = NULL;
      char *infile = NULL, *outfile = NULL, *prog;
      unsigned char *buffer = NULL;
      OPTION_CHOICE o;
      int asn1_flag = OPENSSL_EC_NAMED_CURVE, new_asn1_flag = 0;
      int informat = FORMAT_PEM, outformat = FORMAT_PEM, noout = 0, C = 0;
      int ret = 1, private = 0;
      int list_curves = 0, no_seed = 0, check = 0, new_form = 0;
      int text = 0, i, need_rand = 0, genkey = 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_C:
              C = 1;
              break;
          case OPT_CHECK:
              check = 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:
              if (!opt_pair(opt_arg(), forms, &new_form))
                  goto opthelp;
              form = new_form;
              new_form = 1;
              break;
          case OPT_PARAM_ENC:
              if (!opt_pair(opt_arg(), encodings, &asn1_flag))
                  goto opthelp;
              new_asn1_flag = 1;
              break;
          case OPT_GENKEY:
              genkey = need_rand = 1;
              break;
          case OPT_RAND:
              inrand = opt_arg();
              need_rand = 1;
              break;
          case OPT_ENGINE:
              (void)setup_engine(opt_arg(), 0);
              break;
          }
      }
      argc = opt_num_rest();
      if (argc != 0)
          goto opthelp;
  
      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) {
          EC_builtin_curve *curves = NULL;
          size_t crv_len = EC_get_builtin_curves(NULL, 0);
          size_t n;
  
          curves = app_malloc((int)sizeof(*curves) * crv_len, "list curves");
          if (!EC_get_builtin_curves(curves, crv_len)) {
              OPENSSL_free(curves);
              goto end;
          }
  
          for (n = 0; n < crv_len; n++) {
              const char *comment;
              const char *sname;
              comment = curves[n].comment;
              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);
          }
  
          OPENSSL_free(curves);
          ret = 0;
          goto end;
      }
  
      if (curve_name != NULL) {
          int nid;
  
          /*
           * workaround for the SECG curve names secp192r1 and secp256r1 (which
           * are the same as the curves prime192v1 and prime256v1 defined in
           * X9.62)
           */
          if (strcmp(curve_name, "secp192r1") == 0) {
              BIO_printf(bio_err, "using curve name prime192v1 "
                         "instead of secp192r1\n");
              nid = NID_X9_62_prime192v1;
          } else if (strcmp(curve_name, "secp256r1") == 0) {
              BIO_printf(bio_err, "using curve name prime256v1 "
                         "instead of secp256r1\n");
              nid = NID_X9_62_prime256v1;
          } else
              nid = OBJ_sn2nid(curve_name);
  
          if (nid == 0)
              nid = EC_curve_nist2nid(curve_name);
  
          if (nid == 0) {
              BIO_printf(bio_err, "unknown curve name (%s)\n", curve_name);
              goto end;
          }
  
          group = EC_GROUP_new_by_curve_name(nid);
          if (group == NULL) {
              BIO_printf(bio_err, "unable to create curve (%s)\n", curve_name);
              goto end;
          }
          EC_GROUP_set_asn1_flag(group, asn1_flag);
          EC_GROUP_set_point_conversion_form(group, form);
      } else if (informat == FORMAT_ASN1)
          group = d2i_ECPKParameters_bio(in, NULL);
      else
          group = PEM_read_bio_ECPKParameters(in, NULL, NULL, NULL);
      if (group == NULL) {
          BIO_printf(bio_err, "unable to load elliptic curve parameters\n");
          ERR_print_errors(bio_err);
          goto end;
      }
  
      if (new_form)
          EC_GROUP_set_point_conversion_form(group, form);
  
      if (new_asn1_flag)
          EC_GROUP_set_asn1_flag(group, asn1_flag);
  
      if (no_seed) {
          EC_GROUP_set_seed(group, NULL, 0);
      }
  
      if (text) {
          if (!ECPKParameters_print(out, group, 0))
              goto end;
      }
  
      if (check) {
          BIO_printf(bio_err, "checking elliptic curve parameters: ");
          if (!EC_GROUP_check(group, NULL)) {
              BIO_printf(bio_err, "failed\n");
              ERR_print_errors(bio_err);
              goto end;
          }
          BIO_printf(bio_err, "ok\n");
  
      }
  
      if (C) {
          size_t buf_len = 0, tmp_len = 0;
          const EC_POINT *point;
          int is_prime, len = 0;
          const EC_METHOD *meth = EC_GROUP_method_of(group);
  
          if ((ec_p = BN_new()) == NULL
                  || (ec_a = BN_new()) == NULL
                  || (ec_b = BN_new()) == NULL
                  || (ec_gen = BN_new()) == NULL
                  || (ec_order = BN_new()) == NULL
                  || (ec_cofactor = BN_new()) == NULL) {
              perror("Can't allocate BN");
              goto end;
          }
  
          is_prime = (EC_METHOD_get_field_type(meth) == NID_X9_62_prime_field);
          if (!is_prime) {
              BIO_printf(bio_err, "Can only handle X9.62 prime fields\n");
              goto end;
          }
  
          if (!EC_GROUP_get_curve_GFp(group, ec_p, ec_a, ec_b, NULL))
              goto end;
  
          if ((point = EC_GROUP_get0_generator(group)) == NULL)
              goto end;
          if (!EC_POINT_point2bn(group, point,
                                 EC_GROUP_get_point_conversion_form(group),
                                 ec_gen, NULL))
              goto end;
          if (!EC_GROUP_get_order(group, ec_order, NULL))
              goto end;
          if (!EC_GROUP_get_cofactor(group, ec_cofactor, NULL))
              goto end;
  
          if (!ec_p || !ec_a || !ec_b || !ec_gen || !ec_order || !ec_cofactor)
              goto end;
  
          len = BN_num_bits(ec_order);
  
          if ((tmp_len = (size_t)BN_num_bytes(ec_p)) > buf_len)
              buf_len = tmp_len;
          if ((tmp_len = (size_t)BN_num_bytes(ec_a)) > buf_len)
              buf_len = tmp_len;
          if ((tmp_len = (size_t)BN_num_bytes(ec_b)) > buf_len)
              buf_len = tmp_len;
          if ((tmp_len = (size_t)BN_num_bytes(ec_gen)) > buf_len)
              buf_len = tmp_len;
          if ((tmp_len = (size_t)BN_num_bytes(ec_order)) > buf_len)
              buf_len = tmp_len;
          if ((tmp_len = (size_t)BN_num_bytes(ec_cofactor)) > buf_len)
              buf_len = tmp_len;
  
          buffer = app_malloc(buf_len, "BN buffer");
  
          BIO_printf(out, "EC_GROUP *get_ec_group_%d(void)\n{\n", len);
          print_bignum_var(out, ec_p, "ec_p", len, buffer);
          print_bignum_var(out, ec_a, "ec_a", len, buffer);
          print_bignum_var(out, ec_b, "ec_b", len, buffer);
          print_bignum_var(out, ec_gen, "ec_gen", len, buffer);
          print_bignum_var(out, ec_order, "ec_order", len, buffer);
          print_bignum_var(out, ec_cofactor, "ec_cofactor", len, buffer);
          BIO_printf(out, "    int ok = 0;\n"
                          "    EC_GROUP *group = NULL;\n"
                          "    EC_POINT *point = NULL;\n"
                          "    BIGNUM *tmp_1 = NULL;\n"
                          "    BIGNUM *tmp_2 = NULL;\n"
                          "    BIGNUM *tmp_3 = NULL;\n"
                          "\n");
  
          BIO_printf(out, "    if ((tmp_1 = BN_bin2bn(ec_p_%d, sizeof (ec_p_%d), NULL)) == NULL)\n"
                          "        goto err;\n", len, len);
          BIO_printf(out, "    if ((tmp_2 = BN_bin2bn(ec_a_%d, sizeof (ec_a_%d), NULL)) == NULL)\n"
                          "        goto err;\n", len, len);
          BIO_printf(out, "    if ((tmp_3 = BN_bin2bn(ec_b_%d, sizeof (ec_b_%d), NULL)) == NULL)\n"
                          "        goto err;\n", len, len);
          BIO_printf(out, "    if ((group = EC_GROUP_new_curve_GFp(tmp_1, tmp_2, tmp_3, NULL)) == NULL)\n"
                          "        goto err;\n"
                          "\n");
          BIO_printf(out, "    /* build generator */\n");
          BIO_printf(out, "    if ((tmp_1 = BN_bin2bn(ec_gen_%d, sizeof (ec_gen_%d), tmp_1)) == NULL)\n"
                          "        goto err;\n", len, len);
          BIO_printf(out, "    point = EC_POINT_bn2point(group, tmp_1, NULL, NULL);\n");
          BIO_printf(out, "    if (point == NULL)\n"
                          "        goto err;\n");
          BIO_printf(out, "    if ((tmp_2 = BN_bin2bn(ec_order_%d, sizeof (ec_order_%d), tmp_2)) == NULL)\n"
                          "        goto err;\n", len, len);
          BIO_printf(out, "    if ((tmp_3 = BN_bin2bn(ec_cofactor_%d, sizeof (ec_cofactor_%d), tmp_3)) == NULL)\n"
                          "        goto err;\n", len, len);
          BIO_printf(out, "    if (!EC_GROUP_set_generator(group, point, tmp_2, tmp_3))\n"
                          "        goto err;\n"
                          "ok = 1;"
                          "\n");
          BIO_printf(out, "err:\n"
                          "    BN_free(tmp_1);\n"
                          "    BN_free(tmp_2);\n"
                          "    BN_free(tmp_3);\n"
                          "    EC_POINT_free(point);\n"
                          "    if (!ok) {\n"
                          "        EC_GROUP_free(group);\n"
                          "        return NULL;\n"
                          "    }\n"
                          "    return (group);\n"
                          "}\n");
      }
  
      if (!noout) {
          if (outformat == FORMAT_ASN1)
              i = i2d_ECPKParameters_bio(out, group);
          else
              i = PEM_write_bio_ECPKParameters(out, group);
          if (!i) {
              BIO_printf(bio_err, "unable to write elliptic "
                         "curve parameters\n");
              ERR_print_errors(bio_err);
              goto end;
          }
      }
  
      if (need_rand) {
          app_RAND_load_file(NULL, (inrand != NULL));
          if (inrand != NULL)
              BIO_printf(bio_err, "%ld semi-random bytes loaded\n",
                         app_RAND_load_files(inrand));
      }
  
      if (genkey) {
          EC_KEY *eckey = EC_KEY_new();
  
          if (eckey == NULL)
              goto end;
  
          assert(need_rand);
  
          if (EC_KEY_set_group(eckey, group) == 0) {
              BIO_printf(bio_err, "unable to set group when generating key\n");
              EC_KEY_free(eckey);
              ERR_print_errors(bio_err);
              goto end;
          }
  
          if (!EC_KEY_generate_key(eckey)) {
              BIO_printf(bio_err, "unable to generate key\n");
              EC_KEY_free(eckey);
              ERR_print_errors(bio_err);
              goto end;
          }
          assert(private);
          if (outformat == FORMAT_ASN1)
              i = i2d_ECPrivateKey_bio(out, eckey);
          else
              i = PEM_write_bio_ECPrivateKey(out, eckey, NULL,
                                             NULL, 0, NULL, NULL);
          EC_KEY_free(eckey);
      }
  
      if (need_rand)
          app_RAND_write_file(NULL);
  
      ret = 0;
   end:
      BN_free(ec_p);
      BN_free(ec_a);
      BN_free(ec_b);
      BN_free(ec_gen);
      BN_free(ec_order);
      BN_free(ec_cofactor);
      OPENSSL_free(buffer);
      BIO_free(in);
      BIO_free_all(out);
      EC_GROUP_free(group);
      return (ret);
  }
  
  #endif
  