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x_pubkey.c

/* crypto/asn1/x_pubkey.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/asn1t.h>
#include <openssl/x509.h>
#include "asn1_locl.h"
#ifndef OPENSSL_NO_RSA
#include <openssl/rsa.h>
#endif
#ifndef OPENSSL_NO_DSA
#include <openssl/dsa.h>
#endif

/* Minor tweak to operation: free up EVP_PKEY */
static int pubkey_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
                  void *exarg)
      {
      if (operation == ASN1_OP_FREE_POST)
            {
            X509_PUBKEY *pubkey = (X509_PUBKEY *)*pval;
            EVP_PKEY_free(pubkey->pkey);
            }
      return 1;
      }

ASN1_SEQUENCE_cb(X509_PUBKEY, pubkey_cb) = {
      ASN1_SIMPLE(X509_PUBKEY, algor, X509_ALGOR),
      ASN1_SIMPLE(X509_PUBKEY, public_key, ASN1_BIT_STRING)
} ASN1_SEQUENCE_END_cb(X509_PUBKEY, X509_PUBKEY)

IMPLEMENT_ASN1_FUNCTIONS(X509_PUBKEY)

int X509_PUBKEY_set(X509_PUBKEY **x, EVP_PKEY *pkey)
      {
      X509_PUBKEY *pk=NULL;

      if (x == NULL) return(0);

      if ((pk=X509_PUBKEY_new()) == NULL) goto error;

      if (pkey->ameth)
            {
            if (pkey->ameth->pub_encode)
                  {
                  if (!pkey->ameth->pub_encode(pk, pkey))
                        {
                        X509err(X509_F_X509_PUBKEY_SET,
                              X509_R_PUBLIC_KEY_ENCODE_ERROR);
                        goto error;
                        }
                  }
            else
                  {
                  X509err(X509_F_X509_PUBKEY_SET,
                        X509_R_METHOD_NOT_SUPPORTED);
                  goto error;
                  }
            }
      else
            {
            X509err(X509_F_X509_PUBKEY_SET,X509_R_UNSUPPORTED_ALGORITHM);
            goto error;
            }

      if (*x != NULL)
            X509_PUBKEY_free(*x);

      *x=pk;

      return 1;
error:
      if (pk != NULL) X509_PUBKEY_free(pk);
      return 0;
      }

EVP_PKEY *X509_PUBKEY_get(X509_PUBKEY *key)
      {
      EVP_PKEY *ret=NULL;

      if (key == NULL) goto error;

      if (key->pkey != NULL)
            {
            CRYPTO_add(&key->pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
            return key->pkey;
            }

      if (key->public_key == NULL) goto error;

      if ((ret = EVP_PKEY_new()) == NULL)
            {
            X509err(X509_F_X509_PUBKEY_GET, ERR_R_MALLOC_FAILURE);
            goto error;
            }

      if (!EVP_PKEY_set_type(ret, OBJ_obj2nid(key->algor->algorithm)))
            {
            X509err(X509_F_X509_PUBKEY_GET,X509_R_UNSUPPORTED_ALGORITHM);
            goto error;
            }

      if (ret->ameth->pub_decode)
            {
            if (!ret->ameth->pub_decode(ret, key))
                  {
                  X509err(X509_F_X509_PUBKEY_GET,
                                    X509_R_PUBLIC_KEY_DECODE_ERROR);
                  goto error;
                  }
            }
      else
            {
            X509err(X509_F_X509_PUBKEY_GET, X509_R_METHOD_NOT_SUPPORTED);
            goto error;
            }

      key->pkey = ret;
      CRYPTO_add(&ret->references, 1, CRYPTO_LOCK_EVP_PKEY);

      return ret;

      error:
      if (ret != NULL)
            EVP_PKEY_free(ret);
      return(NULL);
      }

/* Now two pseudo ASN1 routines that take an EVP_PKEY structure
 * and encode or decode as X509_PUBKEY
 */

EVP_PKEY *d2i_PUBKEY(EVP_PKEY **a, const unsigned char **pp,
           long length)
      {
      X509_PUBKEY *xpk;
      EVP_PKEY *pktmp;
      xpk = d2i_X509_PUBKEY(NULL, pp, length);
      if(!xpk) return NULL;
      pktmp = X509_PUBKEY_get(xpk);
      X509_PUBKEY_free(xpk);
      if(!pktmp) return NULL;
      if(a)
            {
            EVP_PKEY_free(*a);
            *a = pktmp;
            }
      return pktmp;
      }

int i2d_PUBKEY(EVP_PKEY *a, unsigned char **pp)
      {
      X509_PUBKEY *xpk=NULL;
      int ret;
      if(!a) return 0;
      if(!X509_PUBKEY_set(&xpk, a)) return 0;
      ret = i2d_X509_PUBKEY(xpk, pp);
      X509_PUBKEY_free(xpk);
      return ret;
      }

/* The following are equivalents but which return RSA and DSA
 * keys
 */
#ifndef OPENSSL_NO_RSA
RSA *d2i_RSA_PUBKEY(RSA **a, const unsigned char **pp,
           long length)
      {
      EVP_PKEY *pkey;
      RSA *key;
      const unsigned char *q;
      q = *pp;
      pkey = d2i_PUBKEY(NULL, &q, length);
      if (!pkey) return NULL;
      key = EVP_PKEY_get1_RSA(pkey);
      EVP_PKEY_free(pkey);
      if (!key) return NULL;
      *pp = q;
      if (a)
            {
            RSA_free(*a);
            *a = key;
            }
      return key;
      }

int i2d_RSA_PUBKEY(RSA *a, unsigned char **pp)
      {
      EVP_PKEY *pktmp;
      int ret;
      if (!a) return 0;
      pktmp = EVP_PKEY_new();
      if (!pktmp)
            {
            ASN1err(ASN1_F_I2D_RSA_PUBKEY, ERR_R_MALLOC_FAILURE);
            return 0;
            }
      EVP_PKEY_set1_RSA(pktmp, a);
      ret = i2d_PUBKEY(pktmp, pp);
      EVP_PKEY_free(pktmp);
      return ret;
      }
#endif

#ifndef OPENSSL_NO_DSA
DSA *d2i_DSA_PUBKEY(DSA **a, const unsigned char **pp,
           long length)
      {
      EVP_PKEY *pkey;
      DSA *key;
      const unsigned char *q;
      q = *pp;
      pkey = d2i_PUBKEY(NULL, &q, length);
      if (!pkey) return NULL;
      key = EVP_PKEY_get1_DSA(pkey);
      EVP_PKEY_free(pkey);
      if (!key) return NULL;
      *pp = q;
      if (a)
            {
            DSA_free(*a);
            *a = key;
            }
      return key;
      }

int i2d_DSA_PUBKEY(DSA *a, unsigned char **pp)
      {
      EVP_PKEY *pktmp;
      int ret;
      if(!a) return 0;
      pktmp = EVP_PKEY_new();
      if(!pktmp)
            {
            ASN1err(ASN1_F_I2D_DSA_PUBKEY, ERR_R_MALLOC_FAILURE);
            return 0;
            }
      EVP_PKEY_set1_DSA(pktmp, a);
      ret = i2d_PUBKEY(pktmp, pp);
      EVP_PKEY_free(pktmp);
      return ret;
      }
#endif

#ifndef OPENSSL_NO_EC
EC_KEY *d2i_EC_PUBKEY(EC_KEY **a, const unsigned char **pp, long length)
      {
      EVP_PKEY *pkey;
      EC_KEY *key;
      const unsigned char *q;
      q = *pp;
      pkey = d2i_PUBKEY(NULL, &q, length);
      if (!pkey) return(NULL);
      key = EVP_PKEY_get1_EC_KEY(pkey);
      EVP_PKEY_free(pkey);
      if (!key)  return(NULL);
      *pp = q;
      if (a)
            {
            EC_KEY_free(*a);
            *a = key;
            }
      return(key);
      }

int i2d_EC_PUBKEY(EC_KEY *a, unsigned char **pp)
      {
      EVP_PKEY *pktmp;
      int ret;
      if (!a)     return(0);
      if ((pktmp = EVP_PKEY_new()) == NULL)
            {
            ASN1err(ASN1_F_I2D_EC_PUBKEY, ERR_R_MALLOC_FAILURE);
            return(0);
            }
      EVP_PKEY_set1_EC_KEY(pktmp, a);
      ret = i2d_PUBKEY(pktmp, pp);
      EVP_PKEY_free(pktmp);
      return(ret);
      }
#endif

int X509_PUBKEY_set0_param(X509_PUBKEY *pub, ASN1_OBJECT *aobj,
                              int ptype, void *pval,
                              unsigned char *penc, int penclen)
      {
      if (!X509_ALGOR_set0(pub->algor, aobj, ptype, pval))
            return 0;
      if (penc)
            {
            if (pub->public_key->data)
                  OPENSSL_free(pub->public_key->data);
            pub->public_key->data = penc;
            pub->public_key->length = penclen;
            /* Set number of unused bits to zero */
            pub->public_key->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);
            pub->public_key->flags|=ASN1_STRING_FLAG_BITS_LEFT;
            }
      return 1;
      }

int X509_PUBKEY_get0_param(ASN1_OBJECT **ppkalg,
            const unsigned char **pk, int *ppklen,
            X509_ALGOR **pa,
            X509_PUBKEY *pub)
      {
      if (ppkalg)
            *ppkalg = pub->algor->algorithm;
      if (pk)
            {
            *pk = pub->public_key->data;
            *ppklen = pub->public_key->length;
            }
      if (pa)
            *pa = pub->algor;
      return 1;
      }

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