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 "x509.h"
  63 #include "rand.h"
  64
  65 /* Extract a private key from a PKCS8 structure */
  66
  67 EVP_PKEY *EVP_PKCS82PKEY (p8)
  68 PKCS8_PRIV_KEY_INFO *p8;
  69 {
  70         EVP_PKEY *pkey;
  71         RSA *rsa;
  72         DSA *dsa;
  73         ASN1_INTEGER *dsapriv;
  74         X509_ALGOR *a;
  75         STACK *ndsa;
  76         BN_CTX *ctx;
  77         unsigned char *p;
  78         int plen, pkeylen;
  79         char obj_tmp[80];
  80
  81         switch (p8->broken) {
  82                 case PKCS8_OK:
  83                 p = p8->pkey->value.octet_string->data;
  84                 pkeylen = p8->pkey->value.octet_string->length;
  85                 break;
  86
  87                 case PKCS8_NO_OCTET:
  88                 p = p8->pkey->value.sequence->data;
  89                 pkeylen = p8->pkey->value.sequence->length;
  90                 break;
  91
  92                 default:
  93                 EVPerr(EVP_F_EVP_PKCS82PKEY,EVP_R_PKCS8_UNKNOWN_BROKEN_TYPE);
  94                 return NULL;
  95                 break;
  96         }
  97         if (!(pkey = EVP_PKEY_new())) {
  98                 EVPerr(EVP_F_EVP_PKCS82PKEY,ERR_R_MALLOC_FAILURE);
  99                 return NULL;
 100         }
 101         a = p8->pkeyalg;
 102         switch (OBJ_obj2nid(a->algorithm))
 103         {
 104                 case NID_rsaEncryption:
 105                 if (!(rsa = d2i_RSAPrivateKey (NULL, &p, pkeylen))) {
 106                         EVPerr(EVP_F_EVP_PKCS82PKEY, EVP_R_DECODE_ERROR);
 107                         return NULL;
 108                 }
 109                 EVP_PKEY_assign_RSA (pkey, rsa);
 110                 break;
 111
 112                 case NID_dsa:
 113                 /* PKCS#8 DSA is weird: you just get a private key integer
 114                  * and parameters in the AlgorithmIdentifier the pubkey must
 115                  * be recalculated.
 116                  */
 117
 118                 /* Check for broken Netscape Database DSA PKCS#8, UGH! */
 119                 if(*p == (V_ASN1_SEQUENCE|V_ASN1_CONSTRUCTED)) {
 120                     if(!(ndsa = ASN1_seq_unpack(p, pkeylen,
 121                                         (char *(*)())d2i_ASN1_INTEGER,
 122                                                          ASN1_STRING_free))) {
 123                         EVPerr(EVP_F_EVP_PKCS82PKEY, EVP_R_DECODE_ERROR);
 124                         return NULL;
 125                     }
 126                     if(sk_num(ndsa) != 2 ) {
 127                         EVPerr(EVP_F_EVP_PKCS82PKEY, EVP_R_DECODE_ERROR);
 128                         sk_pop_free(ndsa, ASN1_STRING_free);
 129                         return NULL;
 130                     }
 131                     dsapriv = (ASN1_INTEGER *) sk_pop(ndsa);
 132                     sk_pop_free(ndsa, ASN1_STRING_free);
 133                 } else if (!(dsapriv=d2i_ASN1_INTEGER (NULL, &p, pkeylen))) {
 134                         EVPerr(EVP_F_EVP_PKCS82PKEY, EVP_R_DECODE_ERROR);
 135                         return NULL;
 136                 }
 137                 /* Retrieve parameters */
 138                 if (a->parameter->type != V_ASN1_SEQUENCE) {
 139                         EVPerr(EVP_F_EVP_PKCS82PKEY, EVP_R_NO_DSA_PARAMETERS);
 140                         return NULL;
 141                 }
 142                 p = a->parameter->value.sequence->data;
 143                 plen = a->parameter->value.sequence->length;
 144                 if (!(dsa = d2i_DSAparams (NULL, &p, plen))) {
 145                         EVPerr(EVP_F_EVP_PKCS82PKEY, EVP_R_DECODE_ERROR);
 146                         return NULL;
 147                 }
 148                 /* We have parameters now set private key */
 149                 if (!(dsa->priv_key = ASN1_INTEGER_to_BN(dsapriv, NULL))) {
 150                         EVPerr(EVP_F_EVP_PKCS82PKEY,EVP_R_BN_DECODE_ERROR);
 151                         DSA_free (dsa);
 152                         return NULL;
 153                 }
 154                 /* Calculate public key (ouch!) */
 155                 if (!(dsa->pub_key = BN_new())) {
 156                         EVPerr(EVP_F_EVP_PKCS82PKEY,ERR_R_MALLOC_FAILURE);
 157                         DSA_free (dsa);
 158                         return NULL;
 159                 }
 160                 if (!(ctx = BN_CTX_new())) {
 161                         EVPerr(EVP_F_EVP_PKCS82PKEY,ERR_R_MALLOC_FAILURE);
 162                         DSA_free (dsa);
 163                         return NULL;
 164                 }
 165
 166                 if (!BN_mod_exp(dsa->pub_key, dsa->g,
 167                                                  dsa->priv_key, dsa->p, ctx)) {
 168
 169                         EVPerr(EVP_F_EVP_PKCS82PKEY,EVP_R_BN_PUBKEY_ERROR);
 170                         BN_CTX_free (ctx);
 171                         DSA_free (dsa);
 172                         return NULL;
 173                 }
 174
 175                 EVP_PKEY_assign_DSA (pkey, dsa);
 176                 BN_CTX_free (ctx);
 177                 break;
 178
 179                 default:
 180                 EVPerr(EVP_F_EVP_PKCS82PKEY, EVP_R_UNSUPPORTED_PRIVATE_KEY_ALGORITHM);
 181                 if (!a->algorithm) strcpy (obj_tmp, "NULL");
 182                 else i2t_ASN1_OBJECT(obj_tmp, 80, a->algorithm);
 183                 ERR_add_error_data(2, "TYPE=", obj_tmp);
 184                 EVP_PKEY_free (pkey);
 185                 return NULL;
 186         }
 187         return pkey;
 188 }
 189
 190 /* Turn a private key into a PKCS8 structure */
 191
 192 PKCS8_PRIV_KEY_INFO *EVP_PKEY2PKCS8(pkey)
 193 EVP_PKEY *pkey;
 194 {
 195         PKCS8_PRIV_KEY_INFO *p8;
 196         ASN1_INTEGER *dpkey;
 197         unsigned char *p, *q;
 198         int len;
 199         if (!(p8 = PKCS8_PRIV_KEY_INFO_new())) {
 200                 EVPerr(EVP_F_EVP_PKEY2PKCS8,ERR_R_MALLOC_FAILURE);
 201                 return NULL;
 202         }
 203         ASN1_INTEGER_set (p8->version, 0);
 204         if (!(p8->pkeyalg->parameter = ASN1_TYPE_new ())) {
 205                 EVPerr(EVP_F_EVP_PKEY2PKCS8,ERR_R_MALLOC_FAILURE);
 206                 PKCS8_PRIV_KEY_INFO_free (p8);
 207                 return NULL;
 208         }
 209         switch (EVP_PKEY_type(pkey->type)) {
 210                 case EVP_PKEY_RSA:
 211
 212                 p8->pkeyalg->algorithm = OBJ_nid2obj(NID_rsaEncryption);
 213                 p8->pkeyalg->parameter->type = V_ASN1_NULL;
 214                 if (!ASN1_pack_string ((char *)pkey, i2d_PrivateKey,
 215                                          &p8->pkey->value.octet_string)) {
 216                         EVPerr(EVP_F_EVP_PKEY2PKCS8,ERR_R_MALLOC_FAILURE);
 217                         PKCS8_PRIV_KEY_INFO_free (p8);
 218                         return NULL;
 219                 }
 220                 break;
 221
 222                 case EVP_PKEY_DSA:
 223                 p8->pkeyalg->algorithm = OBJ_nid2obj(NID_dsa);
 224
 225                 /* get paramaters and place in AlgorithmIdentifier */
 226                 len = i2d_DSAparams (pkey->pkey.dsa, NULL);
 227                 if (!(p = Malloc(len))) {
 228                         EVPerr(EVP_F_EVP_PKEY2PKCS8,ERR_R_MALLOC_FAILURE);
 229                         PKCS8_PRIV_KEY_INFO_free (p8);
 230                         return NULL;
 231                 }
 232                 q = p;
 233                 i2d_DSAparams (pkey->pkey.dsa, &q);
 234                 p8->pkeyalg->parameter->type = V_ASN1_SEQUENCE;
 235                 p8->pkeyalg->parameter->value.sequence = ASN1_STRING_new();
 236                 ASN1_STRING_set(p8->pkeyalg->parameter->value.sequence, p, len);
 237                 Free(p);
 238                 /* Get private key into an integer and pack */
 239                 if (!(dpkey = BN_to_ASN1_INTEGER (pkey->pkey.dsa->priv_key, NULL))) {
 240                         EVPerr(EVP_F_EVP_PKEY2PKCS8,EVP_R_ENCODE_ERROR);
 241                         PKCS8_PRIV_KEY_INFO_free (p8);
 242                         return NULL;
 243                 }
 244
 245                 if (!ASN1_pack_string((char *)dpkey, i2d_ASN1_INTEGER,
 246                                          &p8->pkey->value.octet_string)) {
 247                         EVPerr(EVP_F_EVP_PKEY2PKCS8,ERR_R_MALLOC_FAILURE);
 248                         ASN1_INTEGER_free (dpkey);
 249                         PKCS8_PRIV_KEY_INFO_free (p8);
 250                         return NULL;
 251                 }
 252                 ASN1_INTEGER_free (dpkey);
 253                 break;
 254
 255                 default:
 256                 EVPerr(EVP_F_EVP_PKEY2PKCS8, EVP_R_UNSUPPORTED_PRIVATE_KEY_ALGORITHM);
 257                 PKCS8_PRIV_KEY_INFO_free (p8);
 258                 return NULL;
 259         }
 260         p8->pkey->type = V_ASN1_OCTET_STRING;
 261         RAND_seed (p8->pkey->value.octet_string->data,
 262                                          p8->pkey->value.octet_string->length);
 263         return p8;
 264 }
 265
 266 PKCS8_PRIV_KEY_INFO *PKCS8_set_broken(p8, broken)
 267 PKCS8_PRIV_KEY_INFO *p8;
 268 int broken;
 269 {
 270         switch (broken) {
 271
 272                 case PKCS8_OK:
 273                 p8->broken = PKCS8_OK;
 274                 return p8;
 275                 break;
 276
 277                 case PKCS8_NO_OCTET:
 278                 p8->broken = PKCS8_NO_OCTET;
 279                 p8->pkey->type = V_ASN1_SEQUENCE;
 280                 return p8;
 281                 break;
 282
 283                 default:
 284                 EVPerr(EVP_F_EVP_PKCS8_SET_BROKEN,EVP_R_PKCS8_UNKNOWN_BROKEN_TYPE);
 285                 return NULL;
 286                 break;
 287
 288         }
 289 }
 290
 291