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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>
#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)
      {
      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;
      X509_ALGOR *a;
      ASN1_OBJECT *o;
      unsigned char *s,*p = NULL;
      int i;

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

      if ((pk=X509_PUBKEY_new()) == NULL) goto err;
      a=pk->algor;

      /* set the algorithm id */
      if ((o=OBJ_nid2obj(pkey->type)) == NULL) goto err;
      ASN1_OBJECT_free(a->algorithm);
      a->algorithm=o;

      /* Set the parameter list */
      if (!pkey->save_parameters || (pkey->type == EVP_PKEY_RSA))
            {
            if ((a->parameter == NULL) ||
                  (a->parameter->type != V_ASN1_NULL))
                  {
                  ASN1_TYPE_free(a->parameter);
                  if (!(a->parameter=ASN1_TYPE_new()))
                        {
                        X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
                        goto err;
                        }
                  a->parameter->type=V_ASN1_NULL;
                  }
            }
#ifndef OPENSSL_NO_DSA
      else if (pkey->type == EVP_PKEY_DSA)
            {
            unsigned char *pp;
            DSA *dsa;
            
            dsa=pkey->pkey.dsa;
            dsa->write_params=0;
            ASN1_TYPE_free(a->parameter);
            if ((i=i2d_DSAparams(dsa,NULL)) <= 0)
                  goto err;
            if (!(p=(unsigned char *)OPENSSL_malloc(i)))
                  {
                  X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
                  goto err;
                  }
            pp=p;
            i2d_DSAparams(dsa,&pp);
            if (!(a->parameter=ASN1_TYPE_new()))
                  {
                  OPENSSL_free(p);
                  X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
                  goto err;
                  }
            a->parameter->type=V_ASN1_SEQUENCE;
            if (!(a->parameter->value.sequence=ASN1_STRING_new()))
                  {
                  OPENSSL_free(p);
                  X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
                  goto err;
                  }
            if (!ASN1_STRING_set(a->parameter->value.sequence,p,i))
                  {
                  OPENSSL_free(p);
                  X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
                  goto err;
                  }
            OPENSSL_free(p);
            }
#endif
#ifndef OPENSSL_NO_EC
      else if (pkey->type == EVP_PKEY_EC)
            {
            int nid=0;
            unsigned char *pp;
            EC_KEY *ec_key;
            const EC_GROUP *group;
            
            ec_key = pkey->pkey.ec;
            ASN1_TYPE_free(a->parameter);

            if ((a->parameter = ASN1_TYPE_new()) == NULL)
                  {
                  X509err(X509_F_X509_PUBKEY_SET, ERR_R_ASN1_LIB);
                  goto err;
                  }

            group = EC_KEY_get0_group(ec_key);
            if (EC_GROUP_get_asn1_flag(group)
                     && (nid = EC_GROUP_get_curve_name(group)))
                  {
                  /* just set the OID */
                  a->parameter->type = V_ASN1_OBJECT;
                  a->parameter->value.object = OBJ_nid2obj(nid);
                  }
            else /* explicit parameters */
                  {
                  if ((i = i2d_ECParameters(ec_key, NULL)) == 0)
                        {
                        X509err(X509_F_X509_PUBKEY_SET, ERR_R_EC_LIB);
                        goto err;
                        }
                  if ((p = (unsigned char *) OPENSSL_malloc(i)) == NULL)
                        {
                        X509err(X509_F_X509_PUBKEY_SET, ERR_R_MALLOC_FAILURE);
                        goto err;
                        }     
                  pp = p;
                  if (!i2d_ECParameters(ec_key, &pp))
                        {
                        X509err(X509_F_X509_PUBKEY_SET, ERR_R_EC_LIB);
                        OPENSSL_free(p);
                        goto err;
                        }
                  a->parameter->type = V_ASN1_SEQUENCE;
                  if ((a->parameter->value.sequence = ASN1_STRING_new()) == NULL)
                        {
                        X509err(X509_F_X509_PUBKEY_SET, ERR_R_ASN1_LIB);
                        OPENSSL_free(p);
                        goto err;
                        }
                  ASN1_STRING_set(a->parameter->value.sequence, p, i);
                  OPENSSL_free(p);
                  }
            }
#endif
      else if (1)
            {
            X509err(X509_F_X509_PUBKEY_SET,X509_R_UNSUPPORTED_ALGORITHM);
            goto err;
            }

      if ((i=i2d_PublicKey(pkey,NULL)) <= 0) goto err;
      if ((s=(unsigned char *)OPENSSL_malloc(i+1)) == NULL)
            {
            X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
            goto err;
            }
      p=s;
      i2d_PublicKey(pkey,&p);
      if (!M_ASN1_BIT_STRING_set(pk->public_key,s,i))
            {
            X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
            goto err;
            }
      /* Set number of unused bits to zero */
      pk->public_key->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);
      pk->public_key->flags|=ASN1_STRING_FLAG_BITS_LEFT;

      OPENSSL_free(s);

#if 0
      CRYPTO_add(&pkey->references,1,CRYPTO_LOCK_EVP_PKEY);
      pk->pkey=pkey;
#endif

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

      *x=pk;

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

EVP_PKEY *X509_PUBKEY_get(X509_PUBKEY *key)
      {
      EVP_PKEY *ret=NULL;
      long j;
      int type;
      const unsigned char *p;
#if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
      const unsigned char *cp;
      X509_ALGOR *a;
#endif

      if (key == NULL) goto err;

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

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

      type=OBJ_obj2nid(key->algor->algorithm);
      if ((ret = EVP_PKEY_new()) == NULL)
            {
            X509err(X509_F_X509_PUBKEY_GET, ERR_R_MALLOC_FAILURE);
            goto err;
            }
      ret->type = EVP_PKEY_type(type);

      /* the parameters must be extracted before the public key (ECDSA!) */
      
#if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
      a=key->algor;
#endif

      if (0)
            ;
#ifndef OPENSSL_NO_DSA
      else if (ret->type == EVP_PKEY_DSA)
            {
            if (a->parameter && (a->parameter->type == V_ASN1_SEQUENCE))
                  {
                  if ((ret->pkey.dsa = DSA_new()) == NULL)
                        {
                        X509err(X509_F_X509_PUBKEY_GET, ERR_R_MALLOC_FAILURE);
                        goto err;
                        }
                  ret->pkey.dsa->write_params=0;
                  cp=p=a->parameter->value.sequence->data;
                  j=a->parameter->value.sequence->length;
                  if (!d2i_DSAparams(&ret->pkey.dsa, &cp, (long)j))
                        goto err;
                  }
            ret->save_parameters=1;
            }
#endif
#ifndef OPENSSL_NO_EC
      else if (ret->type == EVP_PKEY_EC)
            {
            if (a->parameter && (a->parameter->type == V_ASN1_SEQUENCE))
                  {
                  /* type == V_ASN1_SEQUENCE => we have explicit parameters
                         * (e.g. parameters in the X9_62_EC_PARAMETERS-structure )
                   */
                  if ((ret->pkey.ec= EC_KEY_new()) == NULL)
                        {
                        X509err(X509_F_X509_PUBKEY_GET, 
                              ERR_R_MALLOC_FAILURE);
                        goto err;
                        }
                  cp = p = a->parameter->value.sequence->data;
                  j = a->parameter->value.sequence->length;
                  if (!d2i_ECParameters(&ret->pkey.ec, &cp, (long)j))
                        {
                        X509err(X509_F_X509_PUBKEY_GET, ERR_R_EC_LIB);
                        goto err;
                        }
                  }
            else if (a->parameter && (a->parameter->type == V_ASN1_OBJECT))
                  {
                  /* type == V_ASN1_OBJECT => the parameters are given
                   * by an asn1 OID
                   */
                  EC_KEY   *ec_key;
                  EC_GROUP *group;

                  if (ret->pkey.ec == NULL)
                        ret->pkey.ec = EC_KEY_new();
                  ec_key = ret->pkey.ec;
                  if (ec_key == NULL)
                        goto err;
                  group = EC_GROUP_new_by_curve_name(OBJ_obj2nid(a->parameter->value.object));
                  if (group == NULL)
                        goto err;
                  EC_GROUP_set_asn1_flag(group, OPENSSL_EC_NAMED_CURVE);
                  if (EC_KEY_set_group(ec_key, group) == 0)
                        goto err;
                  EC_GROUP_free(group);
                  }
                  /* the case implicitlyCA is currently not implemented */
            ret->save_parameters = 1;
            }
#endif

      p=key->public_key->data;
        j=key->public_key->length;
        if (!d2i_PublicKey(type, &ret, &p, (long)j))
            {
            X509err(X509_F_X509_PUBKEY_GET, X509_R_ERR_ASN1_LIB);
            goto err;
            }

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

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