text: /* ====================================================================
   * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
   *
   * The Elliptic Curve Public-Key Crypto Library (ECC Code) included
   * herein is developed by SUN MICROSYSTEMS, INC., and is contributed
   * to the OpenSSL project.
   *
   * The ECC Code is licensed pursuant to the OpenSSL open source
   * license provided below.
   *
   * The ECDH software is originally written by Douglas Stebila of
   * Sun Microsystems Laboratories.
   *
   */
  /* ====================================================================
   * Copyright (c) 1998-2003 The OpenSSL Project.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. All advertising materials mentioning features or use of this
   *    software must display the following acknowledgment:
   *    "This product includes software developed by the OpenSSL Project
   *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
   *
   * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
   *    endorse or promote products derived from this software without
   *    prior written permission. For written permission, please contact
   *    openssl-core@openssl.org.
   *
   * 5. Products derived from this software may not be called "OpenSSL"
   *    nor may "OpenSSL" appear in their names without prior written
   *    permission of the OpenSSL Project.
   *
   * 6. Redistributions of any form whatsoever must retain the following
   *    acknowledgment:
   *    "This product includes software developed by the OpenSSL Project
   *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
   *
   * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
   * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
   * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
   * OF THE POSSIBILITY OF SUCH DAMAGE.
   * ====================================================================
   *
   * This product includes cryptographic software written by Eric Young
   * (eay@cryptsoft.com).  This product includes software written by Tim
   * Hudson (tjh@cryptsoft.com).
   *
   */
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  
  #include "../e_os.h"
  
  #include <openssl/opensslconf.h> /* for OPENSSL_NO_EC */
  #include <openssl/crypto.h>
  #include <openssl/bio.h>
  #include <openssl/bn.h>
  #include <openssl/objects.h>
  #include <openssl/rand.h>
  #include <openssl/sha.h>
  #include <openssl/err.h>
  
  #ifdef OPENSSL_NO_EC
  int main(int argc, char *argv[])
  {
      printf("No ECDH support\n");
      return (0);
  }
  #else
  # include <openssl/ec.h>
  
  static const char rnd_seed[] =
      "string to make the random number generator think it has entropy";
  
  static const int KDF1_SHA1_len = 20;
  static void *KDF1_SHA1(const void *in, size_t inlen, void *out,
                         size_t *outlen)
  {
      if (*outlen < SHA_DIGEST_LENGTH)
          return NULL;
      *outlen = SHA_DIGEST_LENGTH;
      return SHA1(in, inlen, out);
  }
  
  static int test_ecdh_curve(int nid, BN_CTX *ctx, BIO *out)
  {
      EC_KEY *a = NULL;
      EC_KEY *b = NULL;
      BIGNUM *x_a = NULL, *y_a = NULL, *x_b = NULL, *y_b = NULL;
      char buf[12];
      unsigned char *abuf = NULL, *bbuf = NULL;
      int i, alen, blen, aout, bout, ret = 0;
      const EC_GROUP *group;
  
      a = EC_KEY_new_by_curve_name(nid);
      b = EC_KEY_new_by_curve_name(nid);
      if (a == NULL || b == NULL)
          goto err;
  
      group = EC_KEY_get0_group(a);
  
      if ((x_a = BN_new()) == NULL)
          goto err;
      if ((y_a = BN_new()) == NULL)
          goto err;
      if ((x_b = BN_new()) == NULL)
          goto err;
      if ((y_b = BN_new()) == NULL)
          goto err;
  
      BIO_puts(out, "Testing key generation with ");
      BIO_puts(out, OBJ_nid2sn(nid));
  # ifdef NOISY
      BIO_puts(out, "\n");
  # else
      (void)BIO_flush(out);
  # endif
  
      if (!EC_KEY_generate_key(a))
          goto err;
  
      if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) ==
          NID_X9_62_prime_field) {
          if (!EC_POINT_get_affine_coordinates_GFp
              (group, EC_KEY_get0_public_key(a), x_a, y_a, ctx))
              goto err;
      }
  # ifndef OPENSSL_NO_EC2M
      else {
          if (!EC_POINT_get_affine_coordinates_GF2m(group,
                                                    EC_KEY_get0_public_key(a),
                                                    x_a, y_a, ctx))
              goto err;
      }
  # endif
  # ifdef NOISY
      BIO_puts(out, "  pri 1=");
      BN_print(out, a->priv_key);
      BIO_puts(out, "\n  pub 1=");
      BN_print(out, x_a);
      BIO_puts(out, ",");
      BN_print(out, y_a);
      BIO_puts(out, "\n");
  # else
      BIO_printf(out, " .");
      (void)BIO_flush(out);
  # endif
  
      if (!EC_KEY_generate_key(b))
          goto err;
  
      if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) ==
          NID_X9_62_prime_field) {
          if (!EC_POINT_get_affine_coordinates_GFp
              (group, EC_KEY_get0_public_key(b), x_b, y_b, ctx))
              goto err;
      }
  # ifndef OPENSSL_NO_EC2M
      else {
          if (!EC_POINT_get_affine_coordinates_GF2m(group,
                                                    EC_KEY_get0_public_key(b),
                                                    x_b, y_b, ctx))
              goto err;
      }
  # endif
  
  # ifdef NOISY
      BIO_puts(out, "  pri 2=");
      BN_print(out, b->priv_key);
      BIO_puts(out, "\n  pub 2=");
      BN_print(out, x_b);
      BIO_puts(out, ",");
      BN_print(out, y_b);
      BIO_puts(out, "\n");
  # else
      BIO_printf(out, ".");
      (void)BIO_flush(out);
  # endif
  
      alen = KDF1_SHA1_len;
      abuf = OPENSSL_malloc(alen);
      aout =
          ECDH_compute_key(abuf, alen, EC_KEY_get0_public_key(b), a, KDF1_SHA1);
  
  # ifdef NOISY
      BIO_puts(out, "  key1 =");
      for (i = 0; i < aout; i++) {
          sprintf(buf, "%02X", abuf[i]);
          BIO_puts(out, buf);
      }
      BIO_puts(out, "\n");
  # else
      BIO_printf(out, ".");
      (void)BIO_flush(out);
  # endif
  
      blen = KDF1_SHA1_len;
      bbuf = OPENSSL_malloc(blen);
      bout =
          ECDH_compute_key(bbuf, blen, EC_KEY_get0_public_key(a), b, KDF1_SHA1);
  
  # ifdef NOISY
      BIO_puts(out, "  key2 =");
      for (i = 0; i < bout; i++) {
          sprintf(buf, "%02X", bbuf[i]);
          BIO_puts(out, buf);
      }
      BIO_puts(out, "\n");
  # else
      BIO_printf(out, ".");
      (void)BIO_flush(out);
  # endif
  
      if ((aout < 4) || (bout != aout) || (memcmp(abuf, bbuf, aout) != 0)) {
  # ifndef NOISY
          BIO_printf(out, " failed\n\n");
          BIO_printf(out, "key a:\n");
          BIO_printf(out, "private key: ");
          BN_print(out, EC_KEY_get0_private_key(a));
          BIO_printf(out, "\n");
          BIO_printf(out, "public key (x,y): ");
          BN_print(out, x_a);
          BIO_printf(out, ",");
          BN_print(out, y_a);
          BIO_printf(out, "\nkey b:\n");
          BIO_printf(out, "private key: ");
          BN_print(out, EC_KEY_get0_private_key(b));
          BIO_printf(out, "\n");
          BIO_printf(out, "public key (x,y): ");
          BN_print(out, x_b);
          BIO_printf(out, ",");
          BN_print(out, y_b);
          BIO_printf(out, "\n");
          BIO_printf(out, "generated key a: ");
          for (i = 0; i < bout; i++) {
              sprintf(buf, "%02X", bbuf[i]);
              BIO_puts(out, buf);
          }
          BIO_printf(out, "\n");
          BIO_printf(out, "generated key b: ");
          for (i = 0; i < aout; i++) {
              sprintf(buf, "%02X", abuf[i]);
              BIO_puts(out, buf);
          }
          BIO_printf(out, "\n");
  # endif
          fprintf(stderr, "Error in ECDH routines\n");
          ret = 0;
      } else {
  # ifndef NOISY
          BIO_printf(out, " ok\n");
  # endif
          ret = 1;
      }
   err:
      ERR_print_errors_fp(stderr);
  
      OPENSSL_free(abuf);
      OPENSSL_free(bbuf);
      BN_free(x_a);
      BN_free(y_a);
      BN_free(x_b);
      BN_free(y_b);
      EC_KEY_free(b);
      EC_KEY_free(a);
      return (ret);
  }
  
  typedef struct {
      const int nid;
      const char *da;
      const char *db;
      const char *Z;
  } ecdh_kat_t;
  
  static const ecdh_kat_t ecdh_kats[] = {
      /* Keys and shared secrets from RFC 5114 */
      { NID_X9_62_prime192v1,
      "323FA3169D8E9C6593F59476BC142000AB5BE0E249C43426",
      "631F95BB4A67632C9C476EEE9AB695AB240A0499307FCF62",
      "AD420182633F8526BFE954ACDA376F05E5FF4F837F54FEBE" },
      { NID_secp224r1,
      "B558EB6C288DA707BBB4F8FBAE2AB9E9CB62E3BC5C7573E22E26D37F",
      "AC3B1ADD3D9770E6F6A708EE9F3B8E0AB3B480E9F27F85C88B5E6D18",
      "52272F50F46F4EDC9151569092F46DF2D96ECC3B6DC1714A4EA949FA" },
      { NID_X9_62_prime256v1,
      "814264145F2F56F2E96A8E337A1284993FAF432A5ABCE59E867B7291D507A3AF",
      "2CE1788EC197E096DB95A200CC0AB26A19CE6BCCAD562B8EEE1B593761CF7F41",
      "DD0F5396219D1EA393310412D19A08F1F5811E9DC8EC8EEA7F80D21C820C2788" },
      { NID_secp384r1,
      "D27335EA71664AF244DD14E9FD1260715DFD8A7965571C48D709EE7A7962A156"
      "D706A90CBCB5DF2986F05FEADB9376F1",
      "52D1791FDB4B70F89C0F00D456C2F7023B6125262C36A7DF1F80231121CCE3D3"
      "9BE52E00C194A4132C4A6C768BCD94D2",
      "5EA1FC4AF7256D2055981B110575E0A8CAE53160137D904C59D926EB1B8456E4"
      "27AA8A4540884C37DE159A58028ABC0E" },
      { NID_secp521r1,
      "0113F82DA825735E3D97276683B2B74277BAD27335EA71664AF2430CC4F33459"
      "B9669EE78B3FFB9B8683015D344DCBFEF6FB9AF4C6C470BE254516CD3C1A1FB4"
      "7362",
      "00CEE3480D8645A17D249F2776D28BAE616952D1791FDB4B70F7C3378732AA1B"
      "22928448BCD1DC2496D435B01048066EBE4F72903C361B1A9DC1193DC2C9D089"
      "1B96",
      "00CDEA89621CFA46B132F9E4CFE2261CDE2D4368EB5656634C7CC98C7A00CDE5"
      "4ED1866A0DD3E6126C9D2F845DAFF82CEB1DA08F5D87521BB0EBECA77911169C"
      "20CC" },
      /* Keys and shared secrets from RFC 5903 */
      { NID_X9_62_prime256v1,
      "C88F01F510D9AC3F70A292DAA2316DE544E9AAB8AFE84049C62A9C57862D1433",
      "C6EF9C5D78AE012A011164ACB397CE2088685D8F06BF9BE0B283AB46476BEE53",
      "D6840F6B42F6EDAFD13116E0E12565202FEF8E9ECE7DCE03812464D04B9442DE" },
      { NID_secp384r1,
      "099F3C7034D4A2C699884D73A375A67F7624EF7C6B3C0F160647B67414DCE655"
      "E35B538041E649EE3FAEF896783AB194",
      "41CB0779B4BDB85D47846725FBEC3C9430FAB46CC8DC5060855CC9BDA0AA2942"
      "E0308312916B8ED2960E4BD55A7448FC",
      "11187331C279962D93D604243FD592CB9D0A926F422E47187521287E7156C5C4"
      "D603135569B9E9D09CF5D4A270F59746" },
      { NID_secp521r1,
      "0037ADE9319A89F4DABDB3EF411AACCCA5123C61ACAB57B5393DCE47608172A0"
      "95AA85A30FE1C2952C6771D937BA9777F5957B2639BAB072462F68C27A57382D"
      "4A52",
      "0145BA99A847AF43793FDD0E872E7CDFA16BE30FDC780F97BCCC3F078380201E"
      "9C677D600B343757A3BDBF2A3163E4C2F869CCA7458AA4A4EFFC311F5CB15168"
      "5EB9",
      "01144C7D79AE6956BC8EDB8E7C787C4521CB086FA64407F97894E5E6B2D79B04"
      "D1427E73CA4BAA240A34786859810C06B3C715A3A8CC3151F2BEE417996D19F3"
      "DDEA" },
      /* Keys and shared secrets from RFC 7027 */
      { NID_brainpoolP256r1,
      "81DB1EE100150FF2EA338D708271BE38300CB54241D79950F77B063039804F1D",
      "55E40BC41E37E3E2AD25C3C6654511FFA8474A91A0032087593852D3E7D76BD3",
      "89AFC39D41D3B327814B80940B042590F96556EC91E6AE7939BCE31F3A18BF2B" },
      { NID_brainpoolP384r1,
      "1E20F5E048A5886F1F157C74E91BDE2B98C8B52D58E5003D57053FC4B0BD65D6"
      "F15EB5D1EE1610DF870795143627D042",
      "032640BC6003C59260F7250C3DB58CE647F98E1260ACCE4ACDA3DD869F74E01F"
      "8BA5E0324309DB6A9831497ABAC96670",
      "0BD9D3A7EA0B3D519D09D8E48D0785FB744A6B355E6304BC51C229FBBCE239BB"
      "ADF6403715C35D4FB2A5444F575D4F42" },
      { NID_brainpoolP512r1,
      "16302FF0DBBB5A8D733DAB7141C1B45ACBC8715939677F6A56850A38BD87BD59"
      "B09E80279609FF333EB9D4C061231FB26F92EEB04982A5F1D1764CAD57665422",
      "230E18E1BCC88A362FA54E4EA3902009292F7F8033624FD471B5D8ACE49D12CF"
      "ABBC19963DAB8E2F1EBA00BFFB29E4D72D13F2224562F405CB80503666B25429",
      "A7927098655F1F9976FA50A9D566865DC530331846381C87256BAF3226244B76"
      "D36403C024D7BBF0AA0803EAFF405D3D24F11A9B5C0BEF679FE1454B21C4CD1F" }
  };
  
  /* Given private value and NID, create EC_KEY structure */
  
  static EC_KEY *mk_eckey(int nid, const char *str)
  {
      int ok = 0;
      EC_KEY *k = NULL;
      BIGNUM *priv = NULL;
      EC_POINT *pub = NULL;
      const EC_GROUP *grp;
      k = EC_KEY_new_by_curve_name(nid);
      if (!k)
          goto err;
      if(!BN_hex2bn(&priv, str))
          goto err;
      if (!priv)
          goto err;
      if (!EC_KEY_set_private_key(k, priv))
          goto err;
      grp = EC_KEY_get0_group(k);
      pub = EC_POINT_new(grp);
      if (!pub)
          goto err;
      if (!EC_POINT_mul(grp, pub, priv, NULL, NULL, NULL))
          goto err;
      if (!EC_KEY_set_public_key(k, pub))
          goto err;
      ok = 1;
   err:
      BN_clear_free(priv);
      EC_POINT_free(pub);
      if (ok)
          return k;
      EC_KEY_free(k);
      return NULL;
  }
  
  /*
   * Known answer test: compute shared secret and check it matches expected
   * value.
   */
  
  static int ecdh_kat(BIO *out, const ecdh_kat_t *kat)
  {
      int rv = 0;
      EC_KEY *key1 = NULL, *key2 = NULL;
      BIGNUM *bnz = NULL;
      unsigned char *Ztmp = NULL, *Z = NULL;
      size_t Ztmplen, Zlen;
      BIO_puts(out, "Testing ECDH shared secret with ");
      BIO_puts(out, OBJ_nid2sn(kat->nid));
      if(!BN_hex2bn(&bnz, kat->Z))
          goto err;
      key1 = mk_eckey(kat->nid, kat->da);
      key2 = mk_eckey(kat->nid, kat->db);
      if (!key1 || !key2)
          goto err;
      Ztmplen = (EC_GROUP_get_degree(EC_KEY_get0_group(key1)) + 7) / 8;
      Zlen = BN_num_bytes(bnz);
      if (Zlen > Ztmplen)
          goto err;
      if((Ztmp = OPENSSL_zalloc(Ztmplen)) == NULL)
          goto err;
      if((Z = OPENSSL_zalloc(Ztmplen)) == NULL)
          goto err;
      if(!BN_bn2binpad(bnz, Z, Ztmplen))
          goto err;
      if (!ECDH_compute_key(Ztmp, Ztmplen,
                            EC_KEY_get0_public_key(key2), key1, 0))
          goto err;
      if (memcmp(Ztmp, Z, Ztmplen))
          goto err;
      memset(Ztmp, 0, Ztmplen);
      if (!ECDH_compute_key(Ztmp, Ztmplen,
                            EC_KEY_get0_public_key(key1), key2, 0))
          goto err;
      if (memcmp(Ztmp, Z, Ztmplen))
          goto err;
      rv = 1;
   err:
      EC_KEY_free(key1);
      EC_KEY_free(key2);
      OPENSSL_free(Ztmp);
      OPENSSL_free(Z);
      BN_free(bnz);
      if (rv)
          BIO_puts(out, " ok\n");
      else {
          fprintf(stderr, "Error in ECDH routines\n");
          ERR_print_errors_fp(stderr);
      }
      return rv;
  }
  
  #include "ecdhtest_cavs.h"
  
  /*
   * NIST SP800-56A co-factor ECDH tests.
   * KATs taken from NIST documents with parameters:
   *
   * - (QCAVSx,QCAVSy) is the public key for CAVS.
   * - dIUT is the private key for IUT.
   * - (QIUTx,QIUTy) is the public key for IUT.
   * - ZIUT is the shared secret KAT.
   *
   * CAVS: Cryptographic Algorithm Validation System
   * IUT: Implementation Under Test
   *
   * This function tests two things:
   *
   * 1. dIUT * G = (QIUTx,QIUTy)
   *    i.e. public key for IUT computes correctly.
   * 2. x-coord of cofactor * dIUT * (QCAVSx,QCAVSy) = ZIUT
   *    i.e. co-factor ECDH key computes correctly.
   *
   * returns zero on failure or unsupported curve. One otherwise.
   */
  static int ecdh_cavs_kat(BIO *out, const ecdh_cavs_kat_t *kat)
  {
      int rv = 0, is_char_two = 0;
      EC_KEY *key1 = NULL;
      EC_POINT *pub = NULL;
      const EC_GROUP *group = NULL;
      BIGNUM *bnz = NULL, *x = NULL, *y = NULL;
      unsigned char *Ztmp = NULL, *Z = NULL;
      size_t Ztmplen, Zlen;
      BIO_puts(out, "Testing ECC CDH Primitive SP800-56A with ");
      BIO_puts(out, OBJ_nid2sn(kat->nid));
  
      /* dIUT is IUT's private key */
      if ((key1 = mk_eckey(kat->nid, kat->dIUT)) == NULL)
          goto err;
      /* these are cofactor ECDH KATs */
      EC_KEY_set_flags(key1, EC_FLAG_COFACTOR_ECDH);
  
      if ((group = EC_KEY_get0_group(key1)) == NULL)
          goto err;
      if ((pub = EC_POINT_new(group)) == NULL)
          goto err;
  
      if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) == NID_X9_62_characteristic_two_field)
          is_char_two = 1;
  
      /* (QIUTx, QIUTy) is IUT's public key */
      if(!BN_hex2bn(&x, kat->QIUTx))
          goto err;
      if(!BN_hex2bn(&y, kat->QIUTy))
          goto err;
      if (is_char_two) {
  #ifdef OPENSSL_NO_EC2M
          goto err;
  #else
          if (!EC_POINT_set_affine_coordinates_GF2m(group, pub, x, y, NULL))
              goto err;
  #endif
      }
      else {
          if (!EC_POINT_set_affine_coordinates_GFp(group, pub, x, y, NULL))
              goto err;
      }
      /* dIUT * G = (QIUTx, QIUTy) should hold */
      if (EC_POINT_cmp(group, EC_KEY_get0_public_key(key1), pub, NULL))
          goto err;
  
      /* (QCAVSx, QCAVSy) is CAVS's public key */
      if(!BN_hex2bn(&x, kat->QCAVSx))
          goto err;
      if(!BN_hex2bn(&y, kat->QCAVSy))
          goto err;
      if (is_char_two) {
  #ifdef OPENSSL_NO_EC2M
          goto err;
  #else
          if (!EC_POINT_set_affine_coordinates_GF2m(group, pub, x, y, NULL))
              goto err;
  #endif
      }
      else {
          if (!EC_POINT_set_affine_coordinates_GFp(group, pub, x, y, NULL))
              goto err;
      }
  
      /* ZIUT is the shared secret */
      if(!BN_hex2bn(&bnz, kat->ZIUT))
          goto err;
      Ztmplen = (EC_GROUP_get_degree(EC_KEY_get0_group(key1)) + 7) / 8;
      Zlen = BN_num_bytes(bnz);
      if (Zlen > Ztmplen)
          goto err;
      if((Ztmp = OPENSSL_zalloc(Ztmplen)) == NULL)
          goto err;
      if((Z = OPENSSL_zalloc(Ztmplen)) == NULL)
          goto err;
      if(!BN_bn2binpad(bnz, Z, Ztmplen))
          goto err;
      if (!ECDH_compute_key(Ztmp, Ztmplen, pub, key1, 0))
          goto err;
      /* shared secrets should be identical */
      if (memcmp(Ztmp, Z, Ztmplen))
          goto err;
      rv = 1;
   err:
      EC_KEY_free(key1);
      EC_POINT_free(pub);
      BN_free(bnz);
      BN_free(x);
      BN_free(y);
      OPENSSL_free(Ztmp);
      OPENSSL_free(Z);
      if (rv) {
          BIO_puts(out, " ok\n");
      }
      else {
          fprintf(stderr, "Error in ECC CDH routines\n");
          ERR_print_errors_fp(stderr);
      }
      return rv;
  }
  
  int main(int argc, char *argv[])
  {
      BN_CTX *ctx = NULL;
      int nid, ret = 1;
      EC_builtin_curve *curves = NULL;
      size_t crv_len = 0, n = 0;
      BIO *out;
  
      CRYPTO_set_mem_debug(1);
      CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);
  
      RAND_seed(rnd_seed, sizeof rnd_seed);
  
      out = BIO_new(BIO_s_file());
      if (out == NULL)
          EXIT(1);
      BIO_set_fp(out, stdout, BIO_NOCLOSE | BIO_FP_TEXT);
  
      if ((ctx = BN_CTX_new()) == NULL)
          goto err;
  
      /* get a list of all internal curves */
      crv_len = EC_get_builtin_curves(NULL, 0);
      curves = OPENSSL_malloc(sizeof(*curves) * crv_len);
      if (curves == NULL) goto err;
  
      if (!EC_get_builtin_curves(curves, crv_len)) goto err;
  
      /* NAMED CURVES TESTS */
      for (n = 0; n < crv_len; n++) {
          nid = curves[n].nid;
          /*
           * Skipped for X25519 because affine coordinate operations are not
           * supported for this curve.
           * Higher level ECDH tests are performed in evptests.txt instead.
           */
          if (nid == NID_X25519)
              continue;
          if (!test_ecdh_curve(nid, ctx, out)) goto err;
      }
  
      /* KATs */
      for (n = 0; n < (sizeof(ecdh_kats)/sizeof(ecdh_kat_t)); n++) {
          if (!ecdh_kat(out, &ecdh_kats[n]))
              goto err;
      }
  
      /* NIST SP800-56A co-factor ECDH KATs */
      for (n = 0; n < (sizeof(ecdh_cavs_kats)/sizeof(ecdh_cavs_kat_t)); n++) {
          if (!ecdh_cavs_kat(out, &ecdh_cavs_kats[n]))
              goto err;
      }
  
      ret = 0;
  
   err:
      ERR_print_errors_fp(stderr);
      OPENSSL_free(curves);
      BN_CTX_free(ctx);
      BIO_free(out);
  
  #ifndef OPENSSL_NO_CRYPTO_MDEBUG
      if (CRYPTO_mem_leaks_fp(stderr) <= 0)
          ret = 1;
  #endif
      EXIT(ret);
  }
  #endif
  