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p_lib.c
/* crypto/evp/p_lib.c */
/* 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 "cryptlib.h"
#include <openssl/bn.h>
#include <openssl/err.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
#include <openssl/asn1_mac.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 "asn1_locl.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_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 != 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=(EVP_PKEY *)OPENSSL_malloc(sizeof(EVP_PKEY));
      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);
      }

/* 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 (!EVP_PKEY_set_type(pkey, type))
            return 0;
      pkey->pkey.ptr=key;
      return (key != NULL);
      }

void *EVP_PKEY_get0(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_get1_RSA(EVP_PKEY *pkey)
      {
      if(pkey->type != EVP_PKEY_RSA) {
            EVPerr(EVP_F_EVP_PKEY_GET1_RSA, EVP_R_EXPECTING_AN_RSA_KEY);
            return NULL;
      }
      RSA_up_ref(pkey->pkey.rsa);
      return pkey->pkey.rsa;
}
#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_get1_DSA(EVP_PKEY *pkey)
      {
      if(pkey->type != EVP_PKEY_DSA) {
            EVPerr(EVP_F_EVP_PKEY_GET1_DSA, EVP_R_EXPECTING_A_DSA_KEY);
            return NULL;
      }
      DSA_up_ref(pkey->pkey.dsa);
      return pkey->pkey.dsa;
}
#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_get1_EC_KEY(EVP_PKEY *pkey)
{
      if (pkey->type != EVP_PKEY_EC)
      {
            EVPerr(EVP_F_EVP_PKEY_GET1_EC_KEY, EVP_R_EXPECTING_A_EC_KEY);
            return NULL;
      }
      EC_KEY_up_ref(pkey->pkey.ec);
      return pkey->pkey.ec;
}
#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_get1_DH(EVP_PKEY *pkey)
      {
      if(pkey->type != EVP_PKEY_DH) {
            EVPerr(EVP_F_EVP_PKEY_GET1_DH, EVP_R_EXPECTING_A_DH_KEY);
            return NULL;
      }
      DH_up_ref(pkey->pkey.dh);
      return pkey->pkey.dh;
}
#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);
      if (x->attributes)
            sk_X509_ATTRIBUTE_pop_free(x->attributes, X509_ATTRIBUTE_free);
      OPENSSL_free(x);
      }

static void EVP_PKEY_free_it(EVP_PKEY *x)
      {
      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);
      }


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