text: /*
   * Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.
   *
   * Licensed under the Apache License 2.0 (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
   */
  
  #include <assert.h>
  #include <string.h>
  #include <openssl/core_dispatch.h>
  #include <openssl/core_names.h>
  /* For TLS1_VERSION etc */
  #include <openssl/ssl.h>
  #include <openssl/params.h>
  #include "internal/nelem.h"
  #include "internal/tlsgroups.h"
  #include "prov/providercommon.h"
  #include "e_os.h"
  
  typedef struct tls_group_constants_st {
      unsigned int group_id;   /* Group ID */
      unsigned int secbits;    /* Bits of security */
      int mintls;              /* Minimum TLS version, -1 unsupported */
      int maxtls;              /* Maximum TLS version (or 0 for undefined) */
      int mindtls;             /* Minimum DTLS version, -1 unsupported */
      int maxdtls;             /* Maximum DTLS version (or 0 for undefined) */
  } TLS_GROUP_CONSTANTS;
  
  static const TLS_GROUP_CONSTANTS group_list[35] = {
      { OSSL_TLS_GROUP_ID_sect163k1, 80, TLS1_VERSION, 0, DTLS1_VERSION, 0 },
      { OSSL_TLS_GROUP_ID_sect163r1, 80, TLS1_VERSION, 0, DTLS1_VERSION, 0 },
      { OSSL_TLS_GROUP_ID_sect163r2, 80, TLS1_VERSION, 0, DTLS1_VERSION, 0 },
      { OSSL_TLS_GROUP_ID_sect193r1, 80, TLS1_VERSION, 0, DTLS1_VERSION, 0 },
      { OSSL_TLS_GROUP_ID_sect193r2, 80, TLS1_VERSION, 0, DTLS1_VERSION, 0 },
      { OSSL_TLS_GROUP_ID_sect233k1, 112, TLS1_VERSION, 0, DTLS1_VERSION, 0 },
      { OSSL_TLS_GROUP_ID_sect233r1, 112, TLS1_VERSION, 0, DTLS1_VERSION, 0 },
      { OSSL_TLS_GROUP_ID_sect239k1, 112, TLS1_VERSION, 0, DTLS1_VERSION, 0 },
      { OSSL_TLS_GROUP_ID_sect283k1, 128, TLS1_VERSION, 0, DTLS1_VERSION, 0 },
      { OSSL_TLS_GROUP_ID_sect283r1, 128, TLS1_VERSION, 0, DTLS1_VERSION, 0 },
      { OSSL_TLS_GROUP_ID_sect409k1, 192, TLS1_VERSION, 0, DTLS1_VERSION, 0 },
      { OSSL_TLS_GROUP_ID_sect409r1, 192, TLS1_VERSION, 0, DTLS1_VERSION, 0 },
      { OSSL_TLS_GROUP_ID_sect571k1, 256, TLS1_VERSION, 0, DTLS1_VERSION, 0 },
      { OSSL_TLS_GROUP_ID_sect571r1, 256, TLS1_VERSION, 0, DTLS1_VERSION, 0 },
      { OSSL_TLS_GROUP_ID_secp160k1, 80, TLS1_VERSION, 0, DTLS1_VERSION, 0 },
      { OSSL_TLS_GROUP_ID_secp160r1, 80, TLS1_VERSION, 0, DTLS1_VERSION, 0 },
      { OSSL_TLS_GROUP_ID_secp160r2, 80, TLS1_VERSION, 0, DTLS1_VERSION, 0 },
      { OSSL_TLS_GROUP_ID_secp192k1, 80, TLS1_VERSION, 0, DTLS1_VERSION, 0 },
      { OSSL_TLS_GROUP_ID_secp192r1, 80, TLS1_VERSION, 0, DTLS1_VERSION, 0 },
      { OSSL_TLS_GROUP_ID_secp224k1, 112, TLS1_VERSION, 0, DTLS1_VERSION, 0 },
      { OSSL_TLS_GROUP_ID_secp224r1, 112, TLS1_VERSION, 0, DTLS1_VERSION, 0 },
      { OSSL_TLS_GROUP_ID_secp256k1, 128, TLS1_VERSION, 0, DTLS1_VERSION, 0 },
      { OSSL_TLS_GROUP_ID_secp256r1, 128, TLS1_VERSION, 0, DTLS1_VERSION, 0 },
      { OSSL_TLS_GROUP_ID_secp384r1, 192, TLS1_VERSION, 0, DTLS1_VERSION, 0 },
      { OSSL_TLS_GROUP_ID_secp521r1, 256, TLS1_VERSION, 0, DTLS1_VERSION, 0 },
      { OSSL_TLS_GROUP_ID_brainpoolP256r1, 128, TLS1_VERSION, TLS1_2_VERSION,
        DTLS1_VERSION, DTLS1_2_VERSION },
      { OSSL_TLS_GROUP_ID_brainpoolP384r1, 192, TLS1_VERSION, TLS1_2_VERSION,
        DTLS1_VERSION, DTLS1_2_VERSION },
      { OSSL_TLS_GROUP_ID_brainpoolP512r1, 256, TLS1_VERSION, TLS1_2_VERSION,
        DTLS1_VERSION, DTLS1_2_VERSION },
      { OSSL_TLS_GROUP_ID_x25519, 128, TLS1_VERSION, 0, DTLS1_VERSION, 0 },
      { OSSL_TLS_GROUP_ID_x448, 224, TLS1_VERSION, 0, DTLS1_VERSION, 0 },
      /* Security bit values as given by BN_security_bits() */
      { OSSL_TLS_GROUP_ID_ffdhe2048, 112, TLS1_3_VERSION, 0, -1, -1 },
      { OSSL_TLS_GROUP_ID_ffdhe3072, 128, TLS1_3_VERSION, 0, -1, -1 },
      { OSSL_TLS_GROUP_ID_ffdhe4096, 128, TLS1_3_VERSION, 0, -1, -1 },
      { OSSL_TLS_GROUP_ID_ffdhe6144, 128, TLS1_3_VERSION, 0, -1, -1 },
      { OSSL_TLS_GROUP_ID_ffdhe8192, 192, TLS1_3_VERSION, 0, -1, -1 },
  };
  
  #define TLS_GROUP_ENTRY(tlsname, realname, algorithm, idx) \
      { \
          OSSL_PARAM_utf8_string(OSSL_CAPABILITY_TLS_GROUP_NAME, \
                                 tlsname, \
                                 sizeof(tlsname)), \
          OSSL_PARAM_utf8_string(OSSL_CAPABILITY_TLS_GROUP_NAME_INTERNAL, \
                                 realname, \
                                 sizeof(realname)), \
          OSSL_PARAM_utf8_string(OSSL_CAPABILITY_TLS_GROUP_ALG, \
                                 algorithm, \
                                 sizeof(algorithm)), \
          OSSL_PARAM_uint(OSSL_CAPABILITY_TLS_GROUP_ID, \
                          (unsigned int *)&group_list[idx].group_id), \
          OSSL_PARAM_uint(OSSL_CAPABILITY_TLS_GROUP_SECURITY_BITS, \
                          (unsigned int *)&group_list[idx].secbits), \
          OSSL_PARAM_int(OSSL_CAPABILITY_TLS_GROUP_MIN_TLS, \
                          (unsigned int *)&group_list[idx].mintls), \
          OSSL_PARAM_int(OSSL_CAPABILITY_TLS_GROUP_MAX_TLS, \
                          (unsigned int *)&group_list[idx].maxtls), \
          OSSL_PARAM_int(OSSL_CAPABILITY_TLS_GROUP_MIN_DTLS, \
                          (unsigned int *)&group_list[idx].mindtls), \
          OSSL_PARAM_int(OSSL_CAPABILITY_TLS_GROUP_MAX_DTLS, \
                          (unsigned int *)&group_list[idx].maxdtls), \
          OSSL_PARAM_END \
      }
  
  static const OSSL_PARAM param_group_list[][10] = {
  #ifndef OPENSSL_NO_EC
  # ifndef OPENSSL_NO_EC2M
      TLS_GROUP_ENTRY("sect163k1", "sect163k1", "EC", 0),
  # endif
  # ifndef FIPS_MODULE
      TLS_GROUP_ENTRY("sect163r1", "sect163r1", "EC", 1),
  # endif
  # ifndef OPENSSL_NO_EC2M
      TLS_GROUP_ENTRY("sect163r2", "sect163r2", "EC", 2),
  # endif
  # ifndef FIPS_MODULE
      TLS_GROUP_ENTRY("sect193r1", "sect193r1", "EC", 3),
      TLS_GROUP_ENTRY("sect193r2", "sect193r2", "EC", 4),
  # endif
  # ifndef OPENSSL_NO_EC2M
      TLS_GROUP_ENTRY("sect233k1", "sect233k1", "EC", 5),
      TLS_GROUP_ENTRY("sect233r1", "sect233r1", "EC", 6),
  # endif
  # ifndef FIPS_MODULE
      TLS_GROUP_ENTRY("sect239k1", "sect239k1", "EC", 7),
  # endif
  # ifndef OPENSSL_NO_EC2M
      TLS_GROUP_ENTRY("sect283k1", "sect283k1", "EC", 8),
      TLS_GROUP_ENTRY("sect283r1", "sect283r1", "EC", 9),
      TLS_GROUP_ENTRY("sect409k1", "sect409k1", "EC", 10),
      TLS_GROUP_ENTRY("sect409r1", "sect409r1", "EC", 11),
      TLS_GROUP_ENTRY("sect571k1", "sect571k1", "EC", 12),
      TLS_GROUP_ENTRY("sect571r1", "sect571r1", "EC", 13),
  # endif
  # ifndef FIPS_MODULE
      TLS_GROUP_ENTRY("secp160k1", "secp160k1", "EC", 14),
      TLS_GROUP_ENTRY("secp160r1", "secp160r1", "EC", 15),
      TLS_GROUP_ENTRY("secp160r2", "secp160r2", "EC", 16),
      TLS_GROUP_ENTRY("secp192k1", "secp192k1", "EC", 17),
  # endif
      TLS_GROUP_ENTRY("secp192r1", "prime192v1", "EC", 18),
  # ifndef FIPS_MODULE
      TLS_GROUP_ENTRY("secp224k1", "secp224k1", "EC", 19),
  # endif
      TLS_GROUP_ENTRY("secp224r1", "secp224r1", "EC", 20),
  # ifndef FIPS_MODULE
      TLS_GROUP_ENTRY("secp256k1", "secp256k1", "EC", 21),
  # endif
      TLS_GROUP_ENTRY("secp256r1", "prime256v1", "EC", 22),
      TLS_GROUP_ENTRY("secp384r1", "secp384r1", "EC", 23),
      TLS_GROUP_ENTRY("secp521r1", "secp521r1", "EC", 24),
  # ifndef FIPS_MODULE
      TLS_GROUP_ENTRY("brainpoolP256r1", "brainpoolP256r1", "EC", 25),
      TLS_GROUP_ENTRY("brainpoolP384r1", "brainpoolP384r1", "EC", 26),
      TLS_GROUP_ENTRY("brainpoolP512r1", "brainpoolP512r1", "EC", 27),
  # endif
      TLS_GROUP_ENTRY("x25519", "x25519", "X25519", 28),
      TLS_GROUP_ENTRY("x448", "x448", "X448", 29),
  #endif /* OPENSSL_NO_EC */
  #ifndef OPENSSL_NO_DH
      /* Security bit values for FFDHE groups are as per RFC 7919 */
      TLS_GROUP_ENTRY("ffdhe2048", "ffdhe2048", "DH", 30),
      TLS_GROUP_ENTRY("ffdhe3072", "ffdhe3072", "DH", 31),
      TLS_GROUP_ENTRY("ffdhe4096", "ffdhe4096", "DH", 32),
      TLS_GROUP_ENTRY("ffdhe6144", "ffdhe6144", "DH", 33),
      TLS_GROUP_ENTRY("ffdhe8192", "ffdhe8192", "DH", 34),
  #endif
  };
  
  static int tls_group_capability(OSSL_CALLBACK *cb, void *arg)
  {
      size_t i;
  
  #if !defined(OPENSSL_NO_EC) && !defined(OPENSSL_NO_DH) && !defined(FIPS_MODULE)
      assert(OSSL_NELEM(param_group_list) == OSSL_NELEM(group_list));
  #endif
      for (i = 0; i < OSSL_NELEM(param_group_list); i++)
          if (!cb(param_group_list[i], arg))
              return 0;
  
      return 1;
  }
  
  int provider_get_capabilities(void *provctx, const char *capability,
                                OSSL_CALLBACK *cb, void *arg)
  {
      if (strcasecmp(capability, "TLS-GROUP") == 0)
          return tls_group_capability(cb, arg);
  
      /* We don't support this capability */
      return 0;
  }
  