crypto/evp/evp_pkey.c

   1 /* evp_pkey.c */
   2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
   3  * project 1999.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58
  59 #include <stdio.h>
  60 #include <stdlib.h>
  61 #include "cryptlib.h"
  62 #include <openssl/x509.h>
  63 #include <openssl/rand.h>
  64
  65 /* Extract a private key from a PKCS8 structure */
  66
  67 EVP_PKEY *EVP_PKCS82PKEY (PKCS8_PRIV_KEY_INFO *p8)
  68 {
  69         EVP_PKEY *pkey;
  70         RSA *rsa;
  71         DSA *dsa;
  72         ASN1_INTEGER *dsapriv;
  73         X509_ALGOR *a;
  74         STACK *ndsa;
  75         BN_CTX *ctx;
  76         unsigned char *p;
  77         int plen, pkeylen;
  78         char obj_tmp[80];
  79
  80         switch (p8->broken) {
  81                 case PKCS8_OK:
  82                 p = p8->pkey->value.octet_string->data;
  83                 pkeylen = p8->pkey->value.octet_string->length;
  84                 break;
  85
  86                 case PKCS8_NO_OCTET:
  87                 p = p8->pkey->value.sequence->data;
  88                 pkeylen = p8->pkey->value.sequence->length;
  89                 break;
  90
  91                 default:
  92                 EVPerr(EVP_F_EVP_PKCS82PKEY,EVP_R_PKCS8_UNKNOWN_BROKEN_TYPE);
  93                 return NULL;
  94                 break;
  95         }
  96         if (!(pkey = EVP_PKEY_new())) {
  97                 EVPerr(EVP_F_EVP_PKCS82PKEY,ERR_R_MALLOC_FAILURE);
  98                 return NULL;
  99         }
 100         a = p8->pkeyalg;
 101         switch (OBJ_obj2nid(a->algorithm))
 102         {
 103                 case NID_rsaEncryption:
 104                 if (!(rsa = d2i_RSAPrivateKey (NULL, &p, pkeylen))) {
 105                         EVPerr(EVP_F_EVP_PKCS82PKEY, EVP_R_DECODE_ERROR);
 106                         return NULL;
 107                 }
 108                 EVP_PKEY_assign_RSA (pkey, rsa);
 109                 break;
 110
 111                 case NID_dsa:
 112                 /* PKCS#8 DSA is weird: you just get a private key integer
 113                  * and parameters in the AlgorithmIdentifier the pubkey must
 114                  * be recalculated.
 115                  */
 116
 117                 /* Check for broken Netscape Database DSA PKCS#8, UGH! */
 118                 if(*p == (V_ASN1_SEQUENCE|V_ASN1_CONSTRUCTED)) {
 119                     if(!(ndsa = ASN1_seq_unpack(p, pkeylen,
 120                                         (char *(*)())d2i_ASN1_INTEGER,
 121                                                          ASN1_STRING_free))) {
 122                         EVPerr(EVP_F_EVP_PKCS82PKEY, EVP_R_DECODE_ERROR);
 123                         return NULL;
 124                     }
 125                     if(sk_num(ndsa) != 2 ) {
 126                         EVPerr(EVP_F_EVP_PKCS82PKEY, EVP_R_DECODE_ERROR);
 127                         sk_pop_free(ndsa, ASN1_STRING_free);
 128                         return NULL;
 129                     }
 130                     dsapriv = (ASN1_INTEGER *) sk_pop(ndsa);
 131                     sk_pop_free(ndsa, ASN1_STRING_free);
 132                 } else if (!(dsapriv=d2i_ASN1_INTEGER (NULL, &p, pkeylen))) {
 133                         EVPerr(EVP_F_EVP_PKCS82PKEY, EVP_R_DECODE_ERROR);
 134                         return NULL;
 135                 }
 136                 /* Retrieve parameters */
 137                 if (a->parameter->type != V_ASN1_SEQUENCE) {
 138                         EVPerr(EVP_F_EVP_PKCS82PKEY, EVP_R_NO_DSA_PARAMETERS);
 139                         return NULL;
 140                 }
 141                 p = a->parameter->value.sequence->data;
 142                 plen = a->parameter->value.sequence->length;
 143                 if (!(dsa = d2i_DSAparams (NULL, &p, plen))) {
 144                         EVPerr(EVP_F_EVP_PKCS82PKEY, EVP_R_DECODE_ERROR);
 145                         return NULL;
 146                 }
 147                 /* We have parameters now set private key */
 148                 if (!(dsa->priv_key = ASN1_INTEGER_to_BN(dsapriv, NULL))) {
 149                         EVPerr(EVP_F_EVP_PKCS82PKEY,EVP_R_BN_DECODE_ERROR);
 150                         DSA_free (dsa);
 151                         return NULL;
 152                 }
 153                 /* Calculate public key (ouch!) */
 154                 if (!(dsa->pub_key = BN_new())) {
 155                         EVPerr(EVP_F_EVP_PKCS82PKEY,ERR_R_MALLOC_FAILURE);
 156                         DSA_free (dsa);
 157                         return NULL;
 158                 }
 159                 if (!(ctx = BN_CTX_new())) {
 160                         EVPerr(EVP_F_EVP_PKCS82PKEY,ERR_R_MALLOC_FAILURE);
 161                         DSA_free (dsa);
 162                         return NULL;
 163                 }
 164
 165                 if (!BN_mod_exp(dsa->pub_key, dsa->g,
 166                                                  dsa->priv_key, dsa->p, ctx)) {
 167
 168                         EVPerr(EVP_F_EVP_PKCS82PKEY,EVP_R_BN_PUBKEY_ERROR);
 169                         BN_CTX_free (ctx);
 170                         DSA_free (dsa);
 171                         return NULL;
 172                 }
 173
 174                 EVP_PKEY_assign_DSA (pkey, dsa);
 175                 BN_CTX_free (ctx);
 176                 break;
 177
 178                 default:
 179                 EVPerr(EVP_F_EVP_PKCS82PKEY, EVP_R_UNSUPPORTED_PRIVATE_KEY_ALGORITHM);
 180                 if (!a->algorithm) strcpy (obj_tmp, "NULL");
 181                 else i2t_ASN1_OBJECT(obj_tmp, 80, a->algorithm);
 182                 ERR_add_error_data(2, "TYPE=", obj_tmp);
 183                 EVP_PKEY_free (pkey);
 184                 return NULL;
 185         }
 186         return pkey;
 187 }
 188
 189 /* Turn a private key into a PKCS8 structure */
 190
 191 PKCS8_PRIV_KEY_INFO *EVP_PKEY2PKCS8(EVP_PKEY *pkey)
 192 {
 193         PKCS8_PRIV_KEY_INFO *p8;
 194         ASN1_INTEGER *dpkey;
 195         unsigned char *p, *q;
 196         int len;
 197         if (!(p8 = PKCS8_PRIV_KEY_INFO_new())) {
 198                 EVPerr(EVP_F_EVP_PKEY2PKCS8,ERR_R_MALLOC_FAILURE);
 199                 return NULL;
 200         }
 201         ASN1_INTEGER_set (p8->version, 0);
 202         if (!(p8->pkeyalg->parameter = ASN1_TYPE_new ())) {
 203                 EVPerr(EVP_F_EVP_PKEY2PKCS8,ERR_R_MALLOC_FAILURE);
 204                 PKCS8_PRIV_KEY_INFO_free (p8);
 205                 return NULL;
 206         }
 207         switch (EVP_PKEY_type(pkey->type)) {
 208                 case EVP_PKEY_RSA:
 209
 210                 p8->pkeyalg->algorithm = OBJ_nid2obj(NID_rsaEncryption);
 211                 p8->pkeyalg->parameter->type = V_ASN1_NULL;
 212                 if (!ASN1_pack_string ((char *)pkey, i2d_PrivateKey,
 213                                          &p8->pkey->value.octet_string)) {
 214                         EVPerr(EVP_F_EVP_PKEY2PKCS8,ERR_R_MALLOC_FAILURE);
 215                         PKCS8_PRIV_KEY_INFO_free (p8);
 216                         return NULL;
 217                 }
 218                 break;
 219
 220                 case EVP_PKEY_DSA:
 221                 p8->pkeyalg->algorithm = OBJ_nid2obj(NID_dsa);
 222
 223                 /* get paramaters and place in AlgorithmIdentifier */
 224                 len = i2d_DSAparams (pkey->pkey.dsa, NULL);
 225                 if (!(p = Malloc(len))) {
 226                         EVPerr(EVP_F_EVP_PKEY2PKCS8,ERR_R_MALLOC_FAILURE);
 227                         PKCS8_PRIV_KEY_INFO_free (p8);
 228                         return NULL;
 229                 }
 230                 q = p;
 231                 i2d_DSAparams (pkey->pkey.dsa, &q);
 232                 p8->pkeyalg->parameter->type = V_ASN1_SEQUENCE;
 233                 p8->pkeyalg->parameter->value.sequence = ASN1_STRING_new();
 234                 ASN1_STRING_set(p8->pkeyalg->parameter->value.sequence, p, len);
 235                 Free(p);
 236                 /* Get private key into an integer and pack */
 237                 if (!(dpkey = BN_to_ASN1_INTEGER (pkey->pkey.dsa->priv_key, NULL))) {
 238                         EVPerr(EVP_F_EVP_PKEY2PKCS8,EVP_R_ENCODE_ERROR);
 239                         PKCS8_PRIV_KEY_INFO_free (p8);
 240                         return NULL;
 241                 }
 242
 243                 if (!ASN1_pack_string((char *)dpkey, i2d_ASN1_INTEGER,
 244                                          &p8->pkey->value.octet_string)) {
 245                         EVPerr(EVP_F_EVP_PKEY2PKCS8,ERR_R_MALLOC_FAILURE);
 246                         ASN1_INTEGER_free (dpkey);
 247                         PKCS8_PRIV_KEY_INFO_free (p8);
 248                         return NULL;
 249                 }
 250                 ASN1_INTEGER_free (dpkey);
 251                 break;
 252
 253                 default:
 254                 EVPerr(EVP_F_EVP_PKEY2PKCS8, EVP_R_UNSUPPORTED_PRIVATE_KEY_ALGORITHM);
 255                 PKCS8_PRIV_KEY_INFO_free (p8);
 256                 return NULL;
 257         }
 258         p8->pkey->type = V_ASN1_OCTET_STRING;
 259         RAND_seed (p8->pkey->value.octet_string->data,
 260                                          p8->pkey->value.octet_string->length);
 261         return p8;
 262 }
 263
 264 PKCS8_PRIV_KEY_INFO *PKCS8_set_broken(PKCS8_PRIV_KEY_INFO *p8, int broken)
 265 {
 266         switch (broken) {
 267
 268                 case PKCS8_OK:
 269                 p8->broken = PKCS8_OK;
 270                 return p8;
 271                 break;
 272
 273                 case PKCS8_NO_OCTET:
 274                 p8->broken = PKCS8_NO_OCTET;
 275                 p8->pkey->type = V_ASN1_SEQUENCE;
 276                 return p8;
 277                 break;
 278
 279                 default:
 280                 EVPerr(EVP_F_EVP_PKCS8_SET_BROKEN,EVP_R_PKCS8_UNKNOWN_BROKEN_TYPE);
 281                 return NULL;
 282                 break;
 283
 284         }
 285 }
 286
 287