text: /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   * All rights reserved.
   *
   * This package is an SSL implementation written
   * by Eric Young (eay@cryptsoft.com).
   * The implementation was written so as to conform with Netscapes SSL.
   *
   * This library is free for commercial and non-commercial use as long as
   * the following conditions are aheared to.  The following conditions
   * apply to all code found in this distribution, be it the RC4, RSA,
   * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
   * included with this distribution is covered by the same copyright terms
   * except that the holder is Tim Hudson (tjh@cryptsoft.com).
   *
   * Copyright remains Eric Young's, and as such any Copyright notices in
   * the code are not to be removed.
   * If this package is used in a product, Eric Young should be given attribution
   * as the author of the parts of the library used.
   * This can be in the form of a textual message at program startup or
   * in documentation (online or textual) provided with the package.
   *
   * 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 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 acknowledgement:
   *    "This product includes cryptographic software written by
   *     Eric Young (eay@cryptsoft.com)"
   *    The word 'cryptographic' can be left out if the rouines from the library
   *    being used are not cryptographic related :-).
   * 4. If you include any Windows specific code (or a derivative thereof) from
   *    the apps directory (application code) you must include an acknowledgement:
   *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
   *
   * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
   * ANY EXPRESS 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 AUTHOR OR 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.
   *
   * The licence and distribution terms for any publically available version or
   * derivative of this code cannot be changed.  i.e. this code cannot simply be
   * copied and put under another distribution licence
   * [including the GNU Public Licence.]
   */
  
  #include <stdio.h>
  #include "internal/cryptlib.h"
  #include <openssl/bn.h>
  #include <openssl/err.h>
  #include <openssl/objects.h>
  #include <openssl/evp.h>
  #include <openssl/x509.h>
  #ifndef OPENSSL_NO_RSA
  # include <openssl/rsa.h>
  #endif
  #ifndef OPENSSL_NO_DSA
  # include <openssl/dsa.h>
  #endif
  #ifndef OPENSSL_NO_DH
  # include <openssl/dh.h>
  #endif
  
  #ifndef OPENSSL_NO_ENGINE
  # include <openssl/engine.h>
  #endif
  
  #include "internal/asn1_int.h"
  #include "internal/evp_int.h"
  
  static void EVP_PKEY_free_it(EVP_PKEY *x);
  
  int EVP_PKEY_bits(EVP_PKEY *pkey)
  {
      if (pkey && pkey->ameth && pkey->ameth->pkey_bits)
          return pkey->ameth->pkey_bits(pkey);
      return 0;
  }
  
  int EVP_PKEY_security_bits(const EVP_PKEY *pkey)
  {
      if (pkey == NULL)
          return 0;
      if (!pkey->ameth || !pkey->ameth->pkey_security_bits)
          return -2;
      return pkey->ameth->pkey_security_bits(pkey);
  }
  
  int EVP_PKEY_size(EVP_PKEY *pkey)
  {
      if (pkey && pkey->ameth && pkey->ameth->pkey_size)
          return pkey->ameth->pkey_size(pkey);
      return 0;
  }
  
  int EVP_PKEY_save_parameters(EVP_PKEY *pkey, int mode)
  {
  #ifndef OPENSSL_NO_DSA
      if (pkey->type == EVP_PKEY_DSA) {
          int ret = pkey->save_parameters;
  
          if (mode >= 0)
              pkey->save_parameters = mode;
          return (ret);
      }
  #endif
  #ifndef OPENSSL_NO_EC
      if (pkey->type == EVP_PKEY_EC) {
          int ret = pkey->save_parameters;
  
          if (mode >= 0)
              pkey->save_parameters = mode;
          return (ret);
      }
  #endif
      return (0);
  }
  
  int EVP_PKEY_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
  {
      if (to->type == EVP_PKEY_NONE) {
          if (EVP_PKEY_set_type(to, from->type) == 0)
              return 0;
      } else if (to->type != from->type) {
          EVPerr(EVP_F_EVP_PKEY_COPY_PARAMETERS, EVP_R_DIFFERENT_KEY_TYPES);
          goto err;
      }
  
      if (EVP_PKEY_missing_parameters(from)) {
          EVPerr(EVP_F_EVP_PKEY_COPY_PARAMETERS, EVP_R_MISSING_PARAMETERS);
          goto err;
      }
      if (from->ameth && from->ameth->param_copy)
          return from->ameth->param_copy(to, from);
   err:
      return 0;
  }
  
  int EVP_PKEY_missing_parameters(const EVP_PKEY *pkey)
  {
      if (pkey->ameth && pkey->ameth->param_missing)
          return pkey->ameth->param_missing(pkey);
      return 0;
  }
  
  int EVP_PKEY_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
  {
      if (a->type != b->type)
          return -1;
      if (a->ameth && a->ameth->param_cmp)
          return a->ameth->param_cmp(a, b);
      return -2;
  }
  
  int EVP_PKEY_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
  {
      if (a->type != b->type)
          return -1;
  
      if (a->ameth) {
          int ret;
          /* Compare parameters if the algorithm has them */
          if (a->ameth->param_cmp) {
              ret = a->ameth->param_cmp(a, b);
              if (ret <= 0)
                  return ret;
          }
  
          if (a->ameth->pub_cmp)
              return a->ameth->pub_cmp(a, b);
      }
  
      return -2;
  }
  
  EVP_PKEY *EVP_PKEY_new(void)
  {
      EVP_PKEY *ret;
  
      ret = OPENSSL_malloc(sizeof(*ret));
      if (ret == NULL) {
          EVPerr(EVP_F_EVP_PKEY_NEW, ERR_R_MALLOC_FAILURE);
          return (NULL);
      }
      ret->type = EVP_PKEY_NONE;
      ret->save_type = EVP_PKEY_NONE;
      ret->references = 1;
      ret->ameth = NULL;
      ret->engine = NULL;
      ret->pkey.ptr = NULL;
      ret->attributes = NULL;
      ret->save_parameters = 1;
      return (ret);
  }
  
  void EVP_PKEY_up_ref(EVP_PKEY *pkey)
  {
      CRYPTO_add(&pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
  }
  
  /*
   * Setup a public key ASN1 method and ENGINE from a NID or a string. If pkey
   * is NULL just return 1 or 0 if the algorithm exists.
   */
  
  static int pkey_set_type(EVP_PKEY *pkey, int type, const char *str, int len)
  {
      const EVP_PKEY_ASN1_METHOD *ameth;
      ENGINE *e = NULL;
      if (pkey) {
          if (pkey->pkey.ptr)
              EVP_PKEY_free_it(pkey);
          /*
           * If key type matches and a method exists then this lookup has
           * succeeded once so just indicate success.
           */
          if ((type == pkey->save_type) && pkey->ameth)
              return 1;
  #ifndef OPENSSL_NO_ENGINE
          /* If we have an ENGINE release it */
          if (pkey->engine) {
              ENGINE_finish(pkey->engine);
              pkey->engine = NULL;
          }
  #endif
      }
      if (str)
          ameth = EVP_PKEY_asn1_find_str(&e, str, len);
      else
          ameth = EVP_PKEY_asn1_find(&e, type);
  #ifndef OPENSSL_NO_ENGINE
      if (!pkey && e)
          ENGINE_finish(e);
  #endif
      if (!ameth) {
          EVPerr(EVP_F_PKEY_SET_TYPE, EVP_R_UNSUPPORTED_ALGORITHM);
          return 0;
      }
      if (pkey) {
          pkey->ameth = ameth;
          pkey->engine = e;
  
          pkey->type = pkey->ameth->pkey_id;
          pkey->save_type = type;
      }
      return 1;
  }
  
  int EVP_PKEY_set_type(EVP_PKEY *pkey, int type)
  {
      return pkey_set_type(pkey, type, NULL, -1);
  }
  
  int EVP_PKEY_set_type_str(EVP_PKEY *pkey, const char *str, int len)
  {
      return pkey_set_type(pkey, EVP_PKEY_NONE, str, len);
  }
  
  int EVP_PKEY_assign(EVP_PKEY *pkey, int type, void *key)
  {
      if (pkey == NULL || !EVP_PKEY_set_type(pkey, type))
          return 0;
      pkey->pkey.ptr = key;
      return (key != NULL);
  }
  
  void *EVP_PKEY_get0(const EVP_PKEY *pkey)
  {
      return pkey->pkey.ptr;
  }
  
  #ifndef OPENSSL_NO_RSA
  int EVP_PKEY_set1_RSA(EVP_PKEY *pkey, RSA *key)
  {
      int ret = EVP_PKEY_assign_RSA(pkey, key);
      if (ret)
          RSA_up_ref(key);
      return ret;
  }
  
  RSA *EVP_PKEY_get0_RSA(EVP_PKEY *pkey)
  {
      if (pkey->type != EVP_PKEY_RSA) {
          EVPerr(EVP_F_EVP_PKEY_GET0_RSA, EVP_R_EXPECTING_AN_RSA_KEY);
          return NULL;
      }
      return pkey->pkey.rsa;
  }
  
  RSA *EVP_PKEY_get1_RSA(EVP_PKEY *pkey)
  {
      RSA *ret = EVP_PKEY_get0_RSA(pkey);
      if (ret != NULL)
          RSA_up_ref(ret);
      return ret;
  }
  #endif
  
  #ifndef OPENSSL_NO_DSA
  int EVP_PKEY_set1_DSA(EVP_PKEY *pkey, DSA *key)
  {
      int ret = EVP_PKEY_assign_DSA(pkey, key);
      if (ret)
          DSA_up_ref(key);
      return ret;
  }
  
  DSA *EVP_PKEY_get0_DSA(EVP_PKEY *pkey)
  {
      if (pkey->type != EVP_PKEY_DSA) {
          EVPerr(EVP_F_EVP_PKEY_GET0_DSA, EVP_R_EXPECTING_A_DSA_KEY);
          return NULL;
      }
      return pkey->pkey.dsa;
  }
  
  DSA *EVP_PKEY_get1_DSA(EVP_PKEY *pkey)
  {
      DSA *ret = EVP_PKEY_get0_DSA(pkey);
      if (ret != NULL)
          DSA_up_ref(ret);
      return ret;
  }
  #endif
  
  #ifndef OPENSSL_NO_EC
  
  int EVP_PKEY_set1_EC_KEY(EVP_PKEY *pkey, EC_KEY *key)
  {
      int ret = EVP_PKEY_assign_EC_KEY(pkey, key);
      if (ret)
          EC_KEY_up_ref(key);
      return ret;
  }
  
  EC_KEY *EVP_PKEY_get0_EC_KEY(EVP_PKEY *pkey)
  {
      if (pkey->type != EVP_PKEY_EC) {
          EVPerr(EVP_F_EVP_PKEY_GET0_EC_KEY, EVP_R_EXPECTING_A_EC_KEY);
          return NULL;
      }
      return pkey->pkey.ec;
  }
  
  EC_KEY *EVP_PKEY_get1_EC_KEY(EVP_PKEY *pkey)
  {
      EC_KEY *ret = EVP_PKEY_get0_EC_KEY(pkey);
      if (ret != NULL)
          EC_KEY_up_ref(ret);
      return ret;
  }
  #endif
  
  #ifndef OPENSSL_NO_DH
  
  int EVP_PKEY_set1_DH(EVP_PKEY *pkey, DH *key)
  {
      int ret = EVP_PKEY_assign_DH(pkey, key);
      if (ret)
          DH_up_ref(key);
      return ret;
  }
  
  DH *EVP_PKEY_get0_DH(EVP_PKEY *pkey)
  {
      if (pkey->type != EVP_PKEY_DH && pkey->type != EVP_PKEY_DHX) {
          EVPerr(EVP_F_EVP_PKEY_GET0_DH, EVP_R_EXPECTING_A_DH_KEY);
          return NULL;
      }
      return pkey->pkey.dh;
  }
  
  DH *EVP_PKEY_get1_DH(EVP_PKEY *pkey)
  {
      DH *ret = EVP_PKEY_get0_DH(pkey);
      if (ret != NULL)
          DH_up_ref(ret);
      return ret;
  }
  #endif
  
  int EVP_PKEY_type(int type)
  {
      int ret;
      const EVP_PKEY_ASN1_METHOD *ameth;
      ENGINE *e;
      ameth = EVP_PKEY_asn1_find(&e, type);
      if (ameth)
          ret = ameth->pkey_id;
      else
          ret = NID_undef;
  #ifndef OPENSSL_NO_ENGINE
      if (e)
          ENGINE_finish(e);
  #endif
      return ret;
  }
  
  int EVP_PKEY_id(const EVP_PKEY *pkey)
  {
      return pkey->type;
  }
  
  int EVP_PKEY_base_id(const EVP_PKEY *pkey)
  {
      return EVP_PKEY_type(pkey->type);
  }
  
  void EVP_PKEY_free(EVP_PKEY *x)
  {
      int i;
  
      if (x == NULL)
          return;
  
      i = CRYPTO_add(&x->references, -1, CRYPTO_LOCK_EVP_PKEY);
  #ifdef REF_PRINT
      REF_PRINT("EVP_PKEY", x);
  #endif
      if (i > 0)
          return;
  #ifdef REF_CHECK
      if (i < 0) {
          fprintf(stderr, "EVP_PKEY_free, bad reference count\n");
          abort();
      }
  #endif
      EVP_PKEY_free_it(x);
      sk_X509_ATTRIBUTE_pop_free(x->attributes, X509_ATTRIBUTE_free);
      OPENSSL_free(x);
  }
  
  static void EVP_PKEY_free_it(EVP_PKEY *x)
  {
      /* internal function; x is never NULL */
      if (x->ameth && x->ameth->pkey_free) {
          x->ameth->pkey_free(x);
          x->pkey.ptr = NULL;
      }
  #ifndef OPENSSL_NO_ENGINE
      if (x->engine) {
          ENGINE_finish(x->engine);
          x->engine = NULL;
      }
  #endif
  }
  
  static int unsup_alg(BIO *out, const EVP_PKEY *pkey, int indent,
                       const char *kstr)
  {
      BIO_indent(out, indent, 128);
      BIO_printf(out, "%s algorithm \"%s\" unsupported\n",
                 kstr, OBJ_nid2ln(pkey->type));
      return 1;
  }
  
  int EVP_PKEY_print_public(BIO *out, const EVP_PKEY *pkey,
                            int indent, ASN1_PCTX *pctx)
  {
      if (pkey->ameth && pkey->ameth->pub_print)
          return pkey->ameth->pub_print(out, pkey, indent, pctx);
  
      return unsup_alg(out, pkey, indent, "Public Key");
  }
  
  int EVP_PKEY_print_private(BIO *out, const EVP_PKEY *pkey,
                             int indent, ASN1_PCTX *pctx)
  {
      if (pkey->ameth && pkey->ameth->priv_print)
          return pkey->ameth->priv_print(out, pkey, indent, pctx);
  
      return unsup_alg(out, pkey, indent, "Private Key");
  }
  
  int EVP_PKEY_print_params(BIO *out, const EVP_PKEY *pkey,
                            int indent, ASN1_PCTX *pctx)
  {
      if (pkey->ameth && pkey->ameth->param_print)
          return pkey->ameth->param_print(out, pkey, indent, pctx);
      return unsup_alg(out, pkey, indent, "Parameters");
  }
  
  int EVP_PKEY_get_default_digest_nid(EVP_PKEY *pkey, int *pnid)
  {
      if (!pkey->ameth || !pkey->ameth->pkey_ctrl)
          return -2;
      return pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_DEFAULT_MD_NID,
                                    0, pnid);
  }
  