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ameth_lib.c

/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project 2006.
 */
/* ====================================================================
 * Copyright (c) 2006 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
 *    licensing@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 "cryptlib.h"
#include <openssl/asn1t.h>
#include <openssl/x509.h>
#ifndef OPENSSL_NO_ENGINE
#include <openssl/engine.h>
#endif
#include "asn1_locl.h"

extern const EVP_PKEY_ASN1_METHOD rsa_asn1_meths[];
extern const EVP_PKEY_ASN1_METHOD dsa_asn1_meths[];
extern const EVP_PKEY_ASN1_METHOD dh_asn1_meth;
extern const EVP_PKEY_ASN1_METHOD eckey_asn1_meth;
extern const EVP_PKEY_ASN1_METHOD hmac_asn1_meth;

/* Keep this sorted in type order !! */
static const EVP_PKEY_ASN1_METHOD *standard_methods[] = 
      {
#ifndef OPENSSL_NO_RSA
      &rsa_asn1_meths[0],
      &rsa_asn1_meths[1],
#endif
#ifndef OPENSSL_NO_DH
      &dh_asn1_meth,
#endif
#ifndef OPENSSL_NO_DSA
      &dsa_asn1_meths[0],
      &dsa_asn1_meths[1],
      &dsa_asn1_meths[2],
      &dsa_asn1_meths[3],
      &dsa_asn1_meths[4],
#endif
#ifndef OPENSSL_NO_EC
      &eckey_asn1_meth,
#endif
      &hmac_asn1_meth
      };

typedef int sk_cmp_fn_type(const char * const *a, const char * const *b);
DECLARE_STACK_OF(EVP_PKEY_ASN1_METHOD)
static STACK_OF(EVP_PKEY_ASN1_METHOD) *app_methods = NULL;



#ifdef TEST
void main()
      {
      int i;
      for (i = 0;
            i < sizeof(standard_methods)/sizeof(EVP_PKEY_ASN1_METHOD *);
            i++)
            fprintf(stderr, "Number %d id=%d (%s)\n", i,
                  standard_methods[i]->pkey_id,
                  OBJ_nid2sn(standard_methods[i]->pkey_id));
      }
#endif

DECLARE_OBJ_BSEARCH_CMP_FN(const EVP_PKEY_ASN1_METHOD *,
                     const EVP_PKEY_ASN1_METHOD *, ameth);

static int ameth_cmp(const EVP_PKEY_ASN1_METHOD * const *a,
                 const EVP_PKEY_ASN1_METHOD * const *b)
      {
        return ((*a)->pkey_id - (*b)->pkey_id);
      }

IMPLEMENT_OBJ_BSEARCH_CMP_FN(const EVP_PKEY_ASN1_METHOD *,
                       const EVP_PKEY_ASN1_METHOD *, ameth);

int EVP_PKEY_asn1_get_count(void)
      {
      int num = sizeof(standard_methods)/sizeof(EVP_PKEY_ASN1_METHOD *);
      if (app_methods)
            num += sk_EVP_PKEY_ASN1_METHOD_num(app_methods);
      return num;
      }

const EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_get0(int idx)
      {
      int num = sizeof(standard_methods)/sizeof(EVP_PKEY_ASN1_METHOD *);
      if (idx < 0)
            return NULL; 
      if (idx < num)
            return standard_methods[idx];
      idx -= num;
      return sk_EVP_PKEY_ASN1_METHOD_value(app_methods, idx);
      }

static const EVP_PKEY_ASN1_METHOD *pkey_asn1_find(int type)
      {
      EVP_PKEY_ASN1_METHOD tmp;
      const EVP_PKEY_ASN1_METHOD *t = &tmp, **ret;
      tmp.pkey_id = type;
      if (app_methods)
            {
            int idx;
            idx = sk_EVP_PKEY_ASN1_METHOD_find(app_methods, &tmp);
            if (idx >= 0)
                  return sk_EVP_PKEY_ASN1_METHOD_value(app_methods, idx);
            }
      ret = OBJ_bsearch_ameth(&t, standard_methods,
                    sizeof(standard_methods)
                    /sizeof(EVP_PKEY_ASN1_METHOD *));
      if (!ret || !*ret)
            return NULL;
      return *ret;
      }

/* Find an implementation of an ASN1 algorithm. If 'pe' is not NULL
 * also search through engines and set *pe to a functional reference
 * to the engine implementing 'type' or NULL if no engine implements 
 * it.
 */

const EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_find(ENGINE **pe, int type)
      {
      const EVP_PKEY_ASN1_METHOD *t;
      ENGINE *e;

      for (;;)
            {
            t = pkey_asn1_find(type);
            if (!t || !(t->pkey_flags & ASN1_PKEY_ALIAS))
                  break;
            type = t->pkey_base_id;
            }
      if (pe)
            {
#ifndef OPENSSL_NO_ENGINE
            /* type will contain the final unaliased type */
            e = ENGINE_get_pkey_asn1_meth_engine(type);
            if (e)
                  {
                  *pe = e;
                  return ENGINE_get_pkey_asn1_meth(e, type);
                  }
#endif
            *pe = NULL;
            }
      return t;
      }

const EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_find_str(ENGINE **pe,
                              const char *str, int len)
      {
      int i;
      const EVP_PKEY_ASN1_METHOD *ameth;
      if (len == -1)
            len = strlen(str);
      if (pe)
            {
#ifndef OPENSSL_NO_ENGINE
            ENGINE *e;
            ameth = ENGINE_pkey_asn1_find_str(&e, str, len);
            if (ameth)
                  {
                  /* Convert structural into
                   * functional reference
                   */
                  if (!ENGINE_init(e))
                        ameth = NULL;
                  ENGINE_free(e);
                  *pe = e;
                  return ameth;
                  }
#endif
            *pe = NULL;
            }
      for (i = 0; i < EVP_PKEY_asn1_get_count(); i++)
            {
            ameth = EVP_PKEY_asn1_get0(i);
            if (ameth->pkey_flags & ASN1_PKEY_ALIAS)
                  continue;
            if (((int)strlen(ameth->pem_str) == len) && 
                  !strncasecmp(ameth->pem_str, str, len))
                  return ameth;
            }
      return NULL;
      }

int EVP_PKEY_asn1_add0(const EVP_PKEY_ASN1_METHOD *ameth)
      {
      if (app_methods == NULL)
            {
            app_methods = sk_EVP_PKEY_ASN1_METHOD_new(ameth_cmp);
            if (!app_methods)
                  return 0;
            }
      if (!sk_EVP_PKEY_ASN1_METHOD_push(app_methods, ameth))
            return 0;
      sk_EVP_PKEY_ASN1_METHOD_sort(app_methods);
      return 1;
      }

int EVP_PKEY_asn1_add_alias(int to, int from)
      {
      EVP_PKEY_ASN1_METHOD *ameth;
      ameth = EVP_PKEY_asn1_new(from, ASN1_PKEY_ALIAS, NULL, NULL);
      if (!ameth)
            return 0;
      ameth->pkey_base_id = to;
      return EVP_PKEY_asn1_add0(ameth);
      }

int EVP_PKEY_asn1_get0_info(int *ppkey_id, int *ppkey_base_id, int *ppkey_flags,
                        const char **pinfo, const char **ppem_str,
                              const EVP_PKEY_ASN1_METHOD *ameth)
      {
      if (!ameth)
            return 0;
      if (ppkey_id)
            *ppkey_id = ameth->pkey_id;
      if (ppkey_base_id)
            *ppkey_base_id = ameth->pkey_base_id;
      if (ppkey_flags)
            *ppkey_flags = ameth->pkey_flags;
      if (pinfo)
            *pinfo = ameth->info;
      if (ppem_str)
            *ppem_str = ameth->pem_str;
      return 1;
      }

const EVP_PKEY_ASN1_METHOD* EVP_PKEY_get0_asn1(EVP_PKEY *pkey)
      {
      return pkey->ameth;
      }

EVP_PKEY_ASN1_METHOD* EVP_PKEY_asn1_new(int id, int flags,
                              const char *pem_str, const char *info)
      {
      EVP_PKEY_ASN1_METHOD *ameth;
      ameth = OPENSSL_malloc(sizeof(EVP_PKEY_ASN1_METHOD));
      if (!ameth)
            return NULL;

      ameth->pkey_id = id;
      ameth->pkey_base_id = id;
      ameth->pkey_flags = flags | ASN1_PKEY_DYNAMIC;

      if (info)
            {
            ameth->info = BUF_strdup(info);
            if (!ameth->info)
                  goto err;
            }

      if (pem_str)
            {
            ameth->pem_str = BUF_strdup(pem_str);
            if (!ameth->pem_str)
                  goto err;
            }

      ameth->pub_decode = 0;
      ameth->pub_encode = 0;
      ameth->pub_cmp = 0;
      ameth->pub_print = 0;

      ameth->priv_decode = 0;
      ameth->priv_encode = 0;
      ameth->priv_print = 0;

      ameth->old_priv_encode = 0;
      ameth->old_priv_decode = 0;

      ameth->pkey_size = 0;
      ameth->pkey_bits = 0;

      ameth->param_decode = 0;
      ameth->param_encode = 0;
      ameth->param_missing = 0;
      ameth->param_copy = 0;
      ameth->param_cmp = 0;
      ameth->param_print = 0;

      ameth->pkey_free = 0;
      ameth->pkey_ctrl = 0;

      return ameth;

      err:

      EVP_PKEY_asn1_free(ameth);
      return NULL;

      }

void EVP_PKEY_asn1_copy(EVP_PKEY_ASN1_METHOD *dst, 
                  const EVP_PKEY_ASN1_METHOD *src)
      {

      dst->pub_decode = src->pub_decode;
      dst->pub_encode = src->pub_encode;
      dst->pub_cmp = src->pub_cmp;
      dst->pub_print = src->pub_print;

      dst->priv_decode = src->priv_decode;
      dst->priv_encode = src->priv_encode;
      dst->priv_print = src->priv_print;

      dst->old_priv_encode = src->old_priv_encode;
      dst->old_priv_decode = src->old_priv_decode;

      dst->pkey_size = src->pkey_size;
      dst->pkey_bits = src->pkey_bits;

      dst->param_decode = src->param_decode;
      dst->param_encode = src->param_encode;
      dst->param_missing = src->param_missing;
      dst->param_copy = src->param_copy;
      dst->param_cmp = src->param_cmp;
      dst->param_print = src->param_print;

      dst->pkey_free = src->pkey_free;
      dst->pkey_ctrl = src->pkey_ctrl;

      }

void EVP_PKEY_asn1_free(EVP_PKEY_ASN1_METHOD *ameth)
      {
      if (ameth && (ameth->pkey_flags & ASN1_PKEY_DYNAMIC))
            {
            if (ameth->pem_str)
                  OPENSSL_free(ameth->pem_str);
            if (ameth->info)
                  OPENSSL_free(ameth->info);
            OPENSSL_free(ameth);
            }
      }

void EVP_PKEY_asn1_set_public(EVP_PKEY_ASN1_METHOD *ameth,
            int (*pub_decode)(EVP_PKEY *pk, X509_PUBKEY *pub),
            int (*pub_encode)(X509_PUBKEY *pub, const EVP_PKEY *pk),
            int (*pub_cmp)(const EVP_PKEY *a, const EVP_PKEY *b),
            int (*pub_print)(BIO *out, const EVP_PKEY *pkey, int indent,
                                          ASN1_PCTX *pctx),
            int (*pkey_size)(const EVP_PKEY *pk),
            int (*pkey_bits)(const EVP_PKEY *pk))
      {
      ameth->pub_decode = pub_decode;
      ameth->pub_encode = pub_encode;
      ameth->pub_cmp = pub_cmp;
      ameth->pub_print = pub_print;
      ameth->pkey_size = pkey_size;
      ameth->pkey_bits = pkey_bits;
      }

void EVP_PKEY_asn1_set_private(EVP_PKEY_ASN1_METHOD *ameth,
            int (*priv_decode)(EVP_PKEY *pk, PKCS8_PRIV_KEY_INFO *p8inf),
            int (*priv_encode)(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pk),
            int (*priv_print)(BIO *out, const EVP_PKEY *pkey, int indent,
                                          ASN1_PCTX *pctx))
      {
      ameth->priv_decode = priv_decode;
      ameth->priv_encode = priv_encode;
      ameth->priv_print = priv_print;
      }

void EVP_PKEY_asn1_set_param(EVP_PKEY_ASN1_METHOD *ameth,
            int (*param_decode)(EVP_PKEY *pkey,
                        const unsigned char **pder, int derlen),
            int (*param_encode)(const EVP_PKEY *pkey, unsigned char **pder),
            int (*param_missing)(const EVP_PKEY *pk),
            int (*param_copy)(EVP_PKEY *to, const EVP_PKEY *from),
            int (*param_cmp)(const EVP_PKEY *a, const EVP_PKEY *b),
            int (*param_print)(BIO *out, const EVP_PKEY *pkey, int indent,
                                          ASN1_PCTX *pctx))
      {
      ameth->param_decode = param_decode;
      ameth->param_encode = param_encode;
      ameth->param_missing = param_missing;
      ameth->param_copy = param_copy;
      ameth->param_cmp = param_cmp;
      ameth->param_print = param_print;
      }

void EVP_PKEY_asn1_set_free(EVP_PKEY_ASN1_METHOD *ameth,
            void (*pkey_free)(EVP_PKEY *pkey))
      {
      ameth->pkey_free = pkey_free;
      }

void EVP_PKEY_asn1_set_ctrl(EVP_PKEY_ASN1_METHOD *ameth,
            int (*pkey_ctrl)(EVP_PKEY *pkey, int op,
                                          long arg1, void *arg2))
      {
      ameth->pkey_ctrl = pkey_ctrl;
      }

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