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evp_pkey.c

/* evp_pkey.c */
/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
 * project 1999.
 */
/* ====================================================================
 * Copyright (c) 1999 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 <stdlib.h>
#include "cryptlib.h"
#include <openssl/x509.h>
#include <openssl/rand.h>

#ifndef OPENSSL_NO_DSA
static int dsa_pkey2pkcs8(PKCS8_PRIV_KEY_INFO *p8inf, EVP_PKEY *pkey);
#endif

/* Extract a private key from a PKCS8 structure */

EVP_PKEY *EVP_PKCS82PKEY (PKCS8_PRIV_KEY_INFO *p8)
{
      EVP_PKEY *pkey = NULL;
#ifndef OPENSSL_NO_RSA
      RSA *rsa = NULL;
#endif
#ifndef OPENSSL_NO_DSA
      DSA *dsa = NULL;
      ASN1_INTEGER *privkey;
      ASN1_TYPE *t1, *t2, *param = NULL;
      STACK_OF(ASN1_TYPE) *ndsa = NULL;
      BN_CTX *ctx = NULL;
      int plen;
#endif
      X509_ALGOR *a;
      unsigned char *p;
      const unsigned char *cp;
      int pkeylen;
      char obj_tmp[80];

      if(p8->pkey->type == V_ASN1_OCTET_STRING) {
            p8->broken = PKCS8_OK;
            p = p8->pkey->value.octet_string->data;
            pkeylen = p8->pkey->value.octet_string->length;
      } else {
            p8->broken = PKCS8_NO_OCTET;
            p = p8->pkey->value.sequence->data;
            pkeylen = p8->pkey->value.sequence->length;
      }
      if (!(pkey = EVP_PKEY_new())) {
            EVPerr(EVP_F_EVP_PKCS82PKEY,ERR_R_MALLOC_FAILURE);
            return NULL;
      }
      a = p8->pkeyalg;
      switch (OBJ_obj2nid(a->algorithm))
      {
#ifndef OPENSSL_NO_RSA
            case NID_rsaEncryption:
            cp = p;
            if (!(rsa = d2i_RSAPrivateKey (NULL,&cp, pkeylen))) {
                  EVPerr(EVP_F_EVP_PKCS82PKEY, EVP_R_DECODE_ERROR);
                  return NULL;
            }
            EVP_PKEY_assign_RSA (pkey, rsa);
            break;
#endif
#ifndef OPENSSL_NO_DSA
            case NID_dsa:
            /* PKCS#8 DSA is weird: you just get a private key integer
               * and parameters in the AlgorithmIdentifier the pubkey must
             * be recalculated.
             */
      
            /* Check for broken DSA PKCS#8, UGH! */
            if(*p == (V_ASN1_SEQUENCE|V_ASN1_CONSTRUCTED)) {
                if(!(ndsa = ASN1_seq_unpack_ASN1_TYPE(p, pkeylen, 
                                            d2i_ASN1_TYPE,
                                            ASN1_TYPE_free))) {
                  EVPerr(EVP_F_EVP_PKCS82PKEY, EVP_R_DECODE_ERROR);
                  goto dsaerr;
                }
                if(sk_ASN1_TYPE_num(ndsa) != 2 ) {
                  EVPerr(EVP_F_EVP_PKCS82PKEY, EVP_R_DECODE_ERROR);
                  goto dsaerr;
                }
                /* Handle Two broken types:
                 * SEQUENCE {parameters, priv_key}
                 * SEQUENCE {pub_key, priv_key}
                 */

                t1 = sk_ASN1_TYPE_value(ndsa, 0);
                t2 = sk_ASN1_TYPE_value(ndsa, 1);
                if(t1->type == V_ASN1_SEQUENCE) {
                  p8->broken = PKCS8_EMBEDDED_PARAM;
                  param = t1;
                } else if(a->parameter->type == V_ASN1_SEQUENCE) {
                  p8->broken = PKCS8_NS_DB;
                  param = a->parameter;
                } else {
                  EVPerr(EVP_F_EVP_PKCS82PKEY, EVP_R_DECODE_ERROR);
                  goto dsaerr;
                }

                if(t2->type != V_ASN1_INTEGER) {
                  EVPerr(EVP_F_EVP_PKCS82PKEY, EVP_R_DECODE_ERROR);
                  goto dsaerr;
                }
                privkey = t2->value.integer;
            } else {
                  if (!(privkey=d2i_ASN1_INTEGER (NULL, &p, pkeylen))) {
                        EVPerr(EVP_F_EVP_PKCS82PKEY, EVP_R_DECODE_ERROR);
                        goto dsaerr;
                  }
                  param = p8->pkeyalg->parameter;
            }
            if (!param || (param->type != V_ASN1_SEQUENCE)) {
                  EVPerr(EVP_F_EVP_PKCS82PKEY, EVP_R_DECODE_ERROR);
                  goto dsaerr;
            }
            cp = p = param->value.sequence->data;
            plen = param->value.sequence->length;
            if (!(dsa = d2i_DSAparams (NULL, &cp, plen))) {
                  EVPerr(EVP_F_EVP_PKCS82PKEY, EVP_R_DECODE_ERROR);
                  goto dsaerr;
            }
            /* We have parameters now set private key */
            if (!(dsa->priv_key = ASN1_INTEGER_to_BN(privkey, NULL))) {
                  EVPerr(EVP_F_EVP_PKCS82PKEY,EVP_R_BN_DECODE_ERROR);
                  goto dsaerr;
            }
            /* Calculate public key (ouch!) */
            if (!(dsa->pub_key = BN_new())) {
                  EVPerr(EVP_F_EVP_PKCS82PKEY,ERR_R_MALLOC_FAILURE);
                  goto dsaerr;
            }
            if (!(ctx = BN_CTX_new())) {
                  EVPerr(EVP_F_EVP_PKCS82PKEY,ERR_R_MALLOC_FAILURE);
                  goto dsaerr;
            }
                  
            if (!BN_mod_exp(dsa->pub_key, dsa->g,
                                     dsa->priv_key, dsa->p, ctx)) {
                  
                  EVPerr(EVP_F_EVP_PKCS82PKEY,EVP_R_BN_PUBKEY_ERROR);
                  goto dsaerr;
            }

            EVP_PKEY_assign_DSA(pkey, dsa);
            BN_CTX_free (ctx);
            if(ndsa) sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
            else ASN1_INTEGER_free(privkey);
            break;
            dsaerr:
            BN_CTX_free (ctx);
            sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
            DSA_free(dsa);
            EVP_PKEY_free(pkey);
            return NULL;
            break;
#endif
            default:
            EVPerr(EVP_F_EVP_PKCS82PKEY, EVP_R_UNSUPPORTED_PRIVATE_KEY_ALGORITHM);
            if (!a->algorithm) BUF_strlcpy (obj_tmp, "NULL", sizeof obj_tmp);
            else i2t_ASN1_OBJECT(obj_tmp, 80, a->algorithm);
            ERR_add_error_data(2, "TYPE=", obj_tmp);
            EVP_PKEY_free (pkey);
            return NULL;
      }
      return pkey;
}

PKCS8_PRIV_KEY_INFO *EVP_PKEY2PKCS8(EVP_PKEY *pkey)
{
      return EVP_PKEY2PKCS8_broken(pkey, PKCS8_OK);
}

/* Turn a private key into a PKCS8 structure */

PKCS8_PRIV_KEY_INFO *EVP_PKEY2PKCS8_broken(EVP_PKEY *pkey, int broken)
{
      PKCS8_PRIV_KEY_INFO *p8;

      if (!(p8 = PKCS8_PRIV_KEY_INFO_new())) {  
            EVPerr(EVP_F_EVP_PKEY2PKCS8,ERR_R_MALLOC_FAILURE);
            return NULL;
      }
      p8->broken = broken;
      ASN1_INTEGER_set (p8->version, 0);
      if (!(p8->pkeyalg->parameter = ASN1_TYPE_new ())) {
            EVPerr(EVP_F_EVP_PKEY2PKCS8,ERR_R_MALLOC_FAILURE);
            PKCS8_PRIV_KEY_INFO_free (p8);
            return NULL;
      }
      p8->pkey->type = V_ASN1_OCTET_STRING;
      switch (EVP_PKEY_type(pkey->type)) {
#ifndef OPENSSL_NO_RSA
            case EVP_PKEY_RSA:

            if(p8->broken == PKCS8_NO_OCTET) p8->pkey->type = V_ASN1_SEQUENCE;

            p8->pkeyalg->algorithm = OBJ_nid2obj(NID_rsaEncryption);
            p8->pkeyalg->parameter->type = V_ASN1_NULL;
            if (!ASN1_pack_string ((char *)pkey, i2d_PrivateKey,
                               &p8->pkey->value.octet_string)) {
                  EVPerr(EVP_F_EVP_PKEY2PKCS8,ERR_R_MALLOC_FAILURE);
                  PKCS8_PRIV_KEY_INFO_free (p8);
                  return NULL;
            }
            break;
#endif
#ifndef OPENSSL_NO_DSA
            case EVP_PKEY_DSA:
            if(!dsa_pkey2pkcs8(p8, pkey)) {
                  PKCS8_PRIV_KEY_INFO_free (p8);
                  return NULL;
            }

            break;
#endif
            default:
            EVPerr(EVP_F_EVP_PKEY2PKCS8, EVP_R_UNSUPPORTED_PRIVATE_KEY_ALGORITHM);
            PKCS8_PRIV_KEY_INFO_free (p8);
            return NULL;
      }
      RAND_add(p8->pkey->value.octet_string->data,
             p8->pkey->value.octet_string->length, 0);
      return p8;
}

PKCS8_PRIV_KEY_INFO *PKCS8_set_broken(PKCS8_PRIV_KEY_INFO *p8, int broken)
{
      switch (broken) {

            case PKCS8_OK:
            p8->broken = PKCS8_OK;
            return p8;
            break;

            case PKCS8_NO_OCTET:
            p8->broken = PKCS8_NO_OCTET;
            p8->pkey->type = V_ASN1_SEQUENCE;
            return p8;
            break;

            default:
            EVPerr(EVP_F_EVP_PKCS8_SET_BROKEN,EVP_R_PKCS8_UNKNOWN_BROKEN_TYPE);
            return NULL;
            break;
            
      }
}

#ifndef OPENSSL_NO_DSA
static int dsa_pkey2pkcs8(PKCS8_PRIV_KEY_INFO *p8, EVP_PKEY *pkey)
{
      ASN1_STRING *params;
      ASN1_INTEGER *prkey;
      ASN1_TYPE *ttmp;
      STACK_OF(ASN1_TYPE) *ndsa;
      unsigned char *p, *q;
      int len;

      p8->pkeyalg->algorithm = OBJ_nid2obj(NID_dsa);
      len = i2d_DSAparams (pkey->pkey.dsa, NULL);
      if (!(p = OPENSSL_malloc(len))) {
            EVPerr(EVP_F_EVP_PKEY2PKCS8,ERR_R_MALLOC_FAILURE);
            PKCS8_PRIV_KEY_INFO_free (p8);
            return 0;
      }
      q = p;
      i2d_DSAparams (pkey->pkey.dsa, &q);
      params = ASN1_STRING_new();
      ASN1_STRING_set(params, p, len);
      OPENSSL_free(p);
      /* Get private key into integer */
      if (!(prkey = BN_to_ASN1_INTEGER (pkey->pkey.dsa->priv_key, NULL))) {
            EVPerr(EVP_F_EVP_PKEY2PKCS8,EVP_R_ENCODE_ERROR);
            return 0;
      }

      switch(p8->broken) {

            case PKCS8_OK:
            case PKCS8_NO_OCTET:

            if (!ASN1_pack_string((char *)prkey, i2d_ASN1_INTEGER,
                               &p8->pkey->value.octet_string)) {
                  EVPerr(EVP_F_EVP_PKEY2PKCS8,ERR_R_MALLOC_FAILURE);
                  M_ASN1_INTEGER_free (prkey);
                  return 0;
            }

            M_ASN1_INTEGER_free (prkey);
            p8->pkeyalg->parameter->value.sequence = params;
            p8->pkeyalg->parameter->type = V_ASN1_SEQUENCE;

            break;

            case PKCS8_NS_DB:

            p8->pkeyalg->parameter->value.sequence = params;
            p8->pkeyalg->parameter->type = V_ASN1_SEQUENCE;
            ndsa = sk_ASN1_TYPE_new_null();
            ttmp = ASN1_TYPE_new();
            if (!(ttmp->value.integer = BN_to_ASN1_INTEGER (pkey->pkey.dsa->pub_key, NULL))) {
                  EVPerr(EVP_F_EVP_PKEY2PKCS8,EVP_R_ENCODE_ERROR);
                  PKCS8_PRIV_KEY_INFO_free(p8);
                  return 0;
            }
            ttmp->type = V_ASN1_INTEGER;
            sk_ASN1_TYPE_push(ndsa, ttmp);

            ttmp = ASN1_TYPE_new();
            ttmp->value.integer = prkey;
            ttmp->type = V_ASN1_INTEGER;
            sk_ASN1_TYPE_push(ndsa, ttmp);

            p8->pkey->value.octet_string = ASN1_OCTET_STRING_new();

            if (!ASN1_seq_pack_ASN1_TYPE(ndsa, i2d_ASN1_TYPE,
                               &p8->pkey->value.octet_string->data,
                               &p8->pkey->value.octet_string->length)) {

                  EVPerr(EVP_F_EVP_PKEY2PKCS8,ERR_R_MALLOC_FAILURE);
                  sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
                  M_ASN1_INTEGER_free(prkey);
                  return 0;
            }
            sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
            break;

            case PKCS8_EMBEDDED_PARAM:

            p8->pkeyalg->parameter->type = V_ASN1_NULL;
            ndsa = sk_ASN1_TYPE_new_null();
            ttmp = ASN1_TYPE_new();
            ttmp->value.sequence = params;
            ttmp->type = V_ASN1_SEQUENCE;
            sk_ASN1_TYPE_push(ndsa, ttmp);

            ttmp = ASN1_TYPE_new();
            ttmp->value.integer = prkey;
            ttmp->type = V_ASN1_INTEGER;
            sk_ASN1_TYPE_push(ndsa, ttmp);

            p8->pkey->value.octet_string = ASN1_OCTET_STRING_new();

            if (!ASN1_seq_pack_ASN1_TYPE(ndsa, i2d_ASN1_TYPE,
                               &p8->pkey->value.octet_string->data,
                               &p8->pkey->value.octet_string->length)) {

                  EVPerr(EVP_F_EVP_PKEY2PKCS8,ERR_R_MALLOC_FAILURE);
                  sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
                  M_ASN1_INTEGER_free (prkey);
                  return 0;
            }
            sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
            break;
      }
      return 1;
}
#endif

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