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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

static void EVP_PKEY_free_it(EVP_PKEY *x);

int EVP_PKEY_bits(EVP_PKEY *pkey)
      {
      if (0)
            return 0;
#ifndef OPENSSL_NO_RSA
      else if (pkey->type == EVP_PKEY_RSA)
            return(BN_num_bits(pkey->pkey.rsa->n));
#endif
#ifndef OPENSSL_NO_DSA
      else if (pkey->type == EVP_PKEY_DSA)
            return(BN_num_bits(pkey->pkey.dsa->p));
#endif
#ifndef OPENSSL_NO_EC
      else if (pkey->type == EVP_PKEY_EC)
            {
            BIGNUM *order = BN_new();
            const EC_GROUP *group;
            int ret;

            if (!order)
                  {
                  ERR_clear_error();
                  return 0;
                  }
            group = EC_KEY_get0_group(pkey->pkey.ec);
            if (!EC_GROUP_get_order(group, order, NULL))
                  {
                  ERR_clear_error();
                  return 0;
                  }

            ret = BN_num_bits(order);
            BN_free(order);
            return ret;
            }
#endif
      return(0);
      }

int EVP_PKEY_size(EVP_PKEY *pkey)
      {
      if (pkey == NULL)
            return(0);
#ifndef OPENSSL_NO_RSA
      if (pkey->type == EVP_PKEY_RSA)
            return(RSA_size(pkey->pkey.rsa));
      else
#endif
#ifndef OPENSSL_NO_DSA
            if (pkey->type == EVP_PKEY_DSA)
            return(DSA_size(pkey->pkey.dsa));
#endif
#ifndef OPENSSL_NO_ECDSA
            if (pkey->type == EVP_PKEY_EC)
            return(ECDSA_size(pkey->pkey.ec));
#endif

      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;
            }
#ifndef OPENSSL_NO_DSA
      if (to->type == EVP_PKEY_DSA)
            {
            BIGNUM *a;

            if ((a=BN_dup(from->pkey.dsa->p)) == NULL) goto err;
            if (to->pkey.dsa->p != NULL) BN_free(to->pkey.dsa->p);
            to->pkey.dsa->p=a;

            if ((a=BN_dup(from->pkey.dsa->q)) == NULL) goto err;
            if (to->pkey.dsa->q != NULL) BN_free(to->pkey.dsa->q);
            to->pkey.dsa->q=a;

            if ((a=BN_dup(from->pkey.dsa->g)) == NULL) goto err;
            if (to->pkey.dsa->g != NULL) BN_free(to->pkey.dsa->g);
            to->pkey.dsa->g=a;
            }
#endif
#ifndef OPENSSL_NO_EC
      if (to->type == EVP_PKEY_EC)
            {
            EC_GROUP *group = EC_GROUP_dup(EC_KEY_get0_group(from->pkey.ec));
            if (group == NULL)
                  goto err;
            if (EC_KEY_set_group(to->pkey.ec, group) == 0)
                  goto err;
            EC_GROUP_free(group);
            }
#endif
      return(1);
err:
      return(0);
      }

int EVP_PKEY_missing_parameters(const EVP_PKEY *pkey)
      {
#ifndef OPENSSL_NO_DSA
      if (pkey->type == EVP_PKEY_DSA)
            {
            DSA *dsa;

            dsa=pkey->pkey.dsa;
            if ((dsa->p == NULL) || (dsa->q == NULL) || (dsa->g == NULL))
                  return(1);
            }
#endif
#ifndef OPENSSL_NO_EC
      if (pkey->type == EVP_PKEY_EC)
            {
            if (EC_KEY_get0_group(pkey->pkey.ec) == NULL)
                  return(1);
            }
#endif

      return(0);
      }

int EVP_PKEY_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
      {
#ifndef OPENSSL_NO_DSA
      if ((a->type == EVP_PKEY_DSA) && (b->type == EVP_PKEY_DSA))
            {
            if (  BN_cmp(a->pkey.dsa->p,b->pkey.dsa->p) ||
                  BN_cmp(a->pkey.dsa->q,b->pkey.dsa->q) ||
                  BN_cmp(a->pkey.dsa->g,b->pkey.dsa->g))
                  return(0);
            else
                  return(1);
            }
#endif
#ifndef OPENSSL_NO_EC
      if (a->type == EVP_PKEY_EC && b->type == EVP_PKEY_EC)
            {
            const EC_GROUP *group_a = EC_KEY_get0_group(a->pkey.ec),
                           *group_b = EC_KEY_get0_group(b->pkey.ec);
            if (EC_GROUP_cmp(group_a, group_b, NULL))
                  return 0;
            else
                  return 1;
            }
#endif
      return(-1);
      }

int EVP_PKEY_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
      {
      if (a->type != b->type)
            return -1;

      if (EVP_PKEY_cmp_parameters(a, b) == 0)
            return 0;

      switch (a->type)
            {
#ifndef OPENSSL_NO_RSA
      case EVP_PKEY_RSA:
            if (BN_cmp(b->pkey.rsa->n,a->pkey.rsa->n) != 0
                  || BN_cmp(b->pkey.rsa->e,a->pkey.rsa->e) != 0)
                  return 0;
            break;
#endif
#ifndef OPENSSL_NO_DSA
      case EVP_PKEY_DSA:
            if (BN_cmp(b->pkey.dsa->pub_key,a->pkey.dsa->pub_key) != 0)
                  return 0;
            break;
#endif
#ifndef OPENSSL_NO_EC
      case EVP_PKEY_EC:
            {
            int  r;
            const EC_GROUP *group = EC_KEY_get0_group(b->pkey.ec);
            const EC_POINT *pa = EC_KEY_get0_public_key(a->pkey.ec),
                           *pb = EC_KEY_get0_public_key(b->pkey.ec);
            r = EC_POINT_cmp(group, pa, pb, NULL);
            if (r != 0)
                  {
                  if (r == 1)
                        return 0;
                  else
                        return -2;
                  }
            }
            break;
#endif
#ifndef OPENSSL_NO_DH
      case EVP_PKEY_DH:
            return -2;
#endif
      default:
            return -2;
            }

      return 1;
      }

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->references=1;
      ret->pkey.ptr=NULL;
      ret->attributes=NULL;
      ret->save_parameters=1;
      return(ret);
      }

int EVP_PKEY_assign(EVP_PKEY *pkey, int type, char *key)
      {
      if (pkey == NULL) return(0);
      if (pkey->pkey.ptr != NULL)
            EVP_PKEY_free_it(pkey);
      pkey->type=EVP_PKEY_type(type);
      pkey->save_type=type;
      pkey->pkey.ptr=key;
      return(key != NULL);
      }

#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)
      {
      switch (type)
            {
      case EVP_PKEY_RSA:
      case EVP_PKEY_RSA2:
            return(EVP_PKEY_RSA);
      case EVP_PKEY_DSA:
      case EVP_PKEY_DSA1:
      case EVP_PKEY_DSA2:
      case EVP_PKEY_DSA3:
      case EVP_PKEY_DSA4:
            return(EVP_PKEY_DSA);
      case EVP_PKEY_DH:
            return(EVP_PKEY_DH);
      case EVP_PKEY_EC:
            return(EVP_PKEY_EC);
      default:
            return(NID_undef);
            }
      }

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)
      {
      switch (x->type)
            {
#ifndef OPENSSL_NO_RSA
      case EVP_PKEY_RSA:
      case EVP_PKEY_RSA2:
            RSA_free(x->pkey.rsa);
            break;
#endif
#ifndef OPENSSL_NO_DSA
      case EVP_PKEY_DSA:
      case EVP_PKEY_DSA2:
      case EVP_PKEY_DSA3:
      case EVP_PKEY_DSA4:
            DSA_free(x->pkey.dsa);
            break;
#endif
#ifndef OPENSSL_NO_EC
      case EVP_PKEY_EC:
            EC_KEY_free(x->pkey.ec);
            break;
#endif
#ifndef OPENSSL_NO_DH
      case EVP_PKEY_DH:
            DH_free(x->pkey.dh);
            break;
#endif
            }
      }


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