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 #ifndef OPENSSL_NO_DSA
  66 static int dsa_pkey2pkcs8(PKCS8_PRIV_KEY_INFO *p8inf, EVP_PKEY *pkey);
  67 #endif
  68
  69 /* Extract a private key from a PKCS8 structure */
  70
  71 EVP_PKEY *EVP_PKCS82PKEY (PKCS8_PRIV_KEY_INFO *p8)
  72 {
  73         EVP_PKEY *pkey = NULL;
  74 #ifndef OPENSSL_NO_RSA
  75         RSA *rsa = NULL;
  76 #endif
  77 #ifndef OPENSSL_NO_DSA
  78         DSA *dsa = NULL;
  79         ASN1_INTEGER *privkey;
  80         ASN1_TYPE *t1, *t2, *param = NULL;
  81         STACK_OF(ASN1_TYPE) *ndsa = NULL;
  82         BN_CTX *ctx = NULL;
  83         int plen;
  84 #endif
  85         X509_ALGOR *a;
  86         unsigned char *p;
  87 #ifndef OPENSSL_NO_RSA
  88         const unsigned char *cp;
  89 #endif
  90         int pkeylen;
  91         char obj_tmp[80];
  92
  93         if(p8->pkey->type == V_ASN1_OCTET_STRING) {
  94                 p8->broken = PKCS8_OK;
  95                 p = p8->pkey->value.octet_string->data;
  96                 pkeylen = p8->pkey->value.octet_string->length;
  97         } else {
  98                 p8->broken = PKCS8_NO_OCTET;
  99                 p = p8->pkey->value.sequence->data;
 100                 pkeylen = p8->pkey->value.sequence->length;
 101         }
 102         if (!(pkey = EVP_PKEY_new())) {
 103                 EVPerr(EVP_F_EVP_PKCS82PKEY,ERR_R_MALLOC_FAILURE);
 104                 return NULL;
 105         }
 106         a = p8->pkeyalg;
 107         switch (OBJ_obj2nid(a->algorithm))
 108         {
 109 #ifndef OPENSSL_NO_RSA
 110                 case NID_rsaEncryption:
 111                 cp = p;
 112                 if (!(rsa = d2i_RSAPrivateKey (NULL,&cp, pkeylen))) {
 113                         EVPerr(EVP_F_EVP_PKCS82PKEY, EVP_R_DECODE_ERROR);
 114                         return NULL;
 115                 }
 116                 EVP_PKEY_assign_RSA (pkey, rsa);
 117                 break;
 118 #endif
 119 #ifndef OPENSSL_NO_DSA
 120                 case NID_dsa:
 121                 /* PKCS#8 DSA is weird: you just get a private key integer
 122                  * and parameters in the AlgorithmIdentifier the pubkey must
 123                  * be recalculated.
 124                  */
 125
 126                 /* Check for broken DSA PKCS#8, UGH! */
 127                 if(*p == (V_ASN1_SEQUENCE|V_ASN1_CONSTRUCTED)) {
 128                     if(!(ndsa = ASN1_seq_unpack_ASN1_TYPE(p, pkeylen,
 129                                                           d2i_ASN1_TYPE,
 130                                                           ASN1_TYPE_free))) {
 131                         EVPerr(EVP_F_EVP_PKCS82PKEY, EVP_R_DECODE_ERROR);
 132                         goto dsaerr;
 133                     }
 134                     if(sk_ASN1_TYPE_num(ndsa) != 2 ) {
 135                         EVPerr(EVP_F_EVP_PKCS82PKEY, EVP_R_DECODE_ERROR);
 136                         goto dsaerr;
 137                     }
 138                     /* Handle Two broken types:
 139                      * SEQUENCE {parameters, priv_key}
 140                      * SEQUENCE {pub_key, priv_key}
 141                      */
 142
 143                     t1 = sk_ASN1_TYPE_value(ndsa, 0);
 144                     t2 = sk_ASN1_TYPE_value(ndsa, 1);
 145                     if(t1->type == V_ASN1_SEQUENCE) {
 146                         p8->broken = PKCS8_EMBEDDED_PARAM;
 147                         param = t1;
 148                     } else if(a->parameter->type == V_ASN1_SEQUENCE) {
 149                         p8->broken = PKCS8_NS_DB;
 150                         param = a->parameter;
 151                     } else {
 152                         EVPerr(EVP_F_EVP_PKCS82PKEY, EVP_R_DECODE_ERROR);
 153                         goto dsaerr;
 154                     }
 155
 156                     if(t2->type != V_ASN1_INTEGER) {
 157                         EVPerr(EVP_F_EVP_PKCS82PKEY, EVP_R_DECODE_ERROR);
 158                         goto dsaerr;
 159                     }
 160                     privkey = t2->value.integer;
 161                 } else {
 162                         if (!(privkey=d2i_ASN1_INTEGER (NULL, &p, pkeylen))) {
 163                                 EVPerr(EVP_F_EVP_PKCS82PKEY, EVP_R_DECODE_ERROR);
 164                                 goto dsaerr;
 165                         }
 166                         param = p8->pkeyalg->parameter;
 167                 }
 168                 if (!param || (param->type != V_ASN1_SEQUENCE)) {
 169                         EVPerr(EVP_F_EVP_PKCS82PKEY, EVP_R_DECODE_ERROR);
 170                         goto dsaerr;
 171                 }
 172                 cp = p = param->value.sequence->data;
 173                 plen = param->value.sequence->length;
 174                 if (!(dsa = d2i_DSAparams (NULL, &cp, plen))) {
 175                         EVPerr(EVP_F_EVP_PKCS82PKEY, EVP_R_DECODE_ERROR);
 176                         goto dsaerr;
 177                 }
 178                 /* We have parameters now set private key */
 179                 if (!(dsa->priv_key = ASN1_INTEGER_to_BN(privkey, NULL))) {
 180                         EVPerr(EVP_F_EVP_PKCS82PKEY,EVP_R_BN_DECODE_ERROR);
 181                         goto dsaerr;
 182                 }
 183                 /* Calculate public key (ouch!) */
 184                 if (!(dsa->pub_key = BN_new())) {
 185                         EVPerr(EVP_F_EVP_PKCS82PKEY,ERR_R_MALLOC_FAILURE);
 186                         goto dsaerr;
 187                 }
 188                 if (!(ctx = BN_CTX_new())) {
 189                         EVPerr(EVP_F_EVP_PKCS82PKEY,ERR_R_MALLOC_FAILURE);
 190                         goto dsaerr;
 191                 }
 192
 193                 if (!BN_mod_exp(dsa->pub_key, dsa->g,
 194                                                  dsa->priv_key, dsa->p, ctx)) {
 195
 196                         EVPerr(EVP_F_EVP_PKCS82PKEY,EVP_R_BN_PUBKEY_ERROR);
 197                         goto dsaerr;
 198                 }
 199
 200                 EVP_PKEY_assign_DSA(pkey, dsa);
 201                 BN_CTX_free (ctx);
 202                 if(ndsa) sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
 203                 else ASN1_INTEGER_free(privkey);
 204                 break;
 205                 dsaerr:
 206                 BN_CTX_free (ctx);
 207                 sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
 208                 DSA_free(dsa);
 209                 EVP_PKEY_free(pkey);
 210                 return NULL;
 211                 break;
 212 #endif
 213                 default:
 214                 EVPerr(EVP_F_EVP_PKCS82PKEY, EVP_R_UNSUPPORTED_PRIVATE_KEY_ALGORITHM);
 215                 if (!a->algorithm) strcpy (obj_tmp, "NULL");
 216                 else i2t_ASN1_OBJECT(obj_tmp, 80, a->algorithm);
 217                 ERR_add_error_data(2, "TYPE=", obj_tmp);
 218                 EVP_PKEY_free (pkey);
 219                 return NULL;
 220         }
 221         return pkey;
 222 }
 223
 224 PKCS8_PRIV_KEY_INFO *EVP_PKEY2PKCS8(EVP_PKEY *pkey)
 225 {
 226         return EVP_PKEY2PKCS8_broken(pkey, PKCS8_OK);
 227 }
 228
 229 /* Turn a private key into a PKCS8 structure */
 230
 231 PKCS8_PRIV_KEY_INFO *EVP_PKEY2PKCS8_broken(EVP_PKEY *pkey, int broken)
 232 {
 233         PKCS8_PRIV_KEY_INFO *p8;
 234
 235         if (!(p8 = PKCS8_PRIV_KEY_INFO_new())) {
 236                 EVPerr(EVP_F_EVP_PKEY2PKCS8,ERR_R_MALLOC_FAILURE);
 237                 return NULL;
 238         }
 239         p8->broken = broken;
 240         ASN1_INTEGER_set (p8->version, 0);
 241         if (!(p8->pkeyalg->parameter = ASN1_TYPE_new ())) {
 242                 EVPerr(EVP_F_EVP_PKEY2PKCS8,ERR_R_MALLOC_FAILURE);
 243                 PKCS8_PRIV_KEY_INFO_free (p8);
 244                 return NULL;
 245         }
 246         p8->pkey->type = V_ASN1_OCTET_STRING;
 247         switch (EVP_PKEY_type(pkey->type)) {
 248 #ifndef OPENSSL_NO_RSA
 249                 case EVP_PKEY_RSA:
 250
 251                 if(p8->broken == PKCS8_NO_OCTET) p8->pkey->type = V_ASN1_SEQUENCE;
 252
 253                 p8->pkeyalg->algorithm = OBJ_nid2obj(NID_rsaEncryption);
 254                 p8->pkeyalg->parameter->type = V_ASN1_NULL;
 255                 if (!ASN1_pack_string ((char *)pkey, i2d_PrivateKey,
 256                                          &p8->pkey->value.octet_string)) {
 257                         EVPerr(EVP_F_EVP_PKEY2PKCS8,ERR_R_MALLOC_FAILURE);
 258                         PKCS8_PRIV_KEY_INFO_free (p8);
 259                         return NULL;
 260                 }
 261                 break;
 262 #endif
 263 #ifndef OPENSSL_NO_DSA
 264                 case EVP_PKEY_DSA:
 265                 if(!dsa_pkey2pkcs8(p8, pkey)) {
 266                         PKCS8_PRIV_KEY_INFO_free (p8);
 267                         return NULL;
 268                 }
 269
 270                 break;
 271 #endif
 272                 default:
 273                 EVPerr(EVP_F_EVP_PKEY2PKCS8, EVP_R_UNSUPPORTED_PRIVATE_KEY_ALGORITHM);
 274                 PKCS8_PRIV_KEY_INFO_free (p8);
 275                 return NULL;
 276         }
 277         RAND_add(p8->pkey->value.octet_string->data,
 278                  p8->pkey->value.octet_string->length, 0);
 279         return p8;
 280 }
 281
 282 PKCS8_PRIV_KEY_INFO *PKCS8_set_broken(PKCS8_PRIV_KEY_INFO *p8, int broken)
 283 {
 284         switch (broken) {
 285
 286                 case PKCS8_OK:
 287                 p8->broken = PKCS8_OK;
 288                 return p8;
 289                 break;
 290
 291                 case PKCS8_NO_OCTET:
 292                 p8->broken = PKCS8_NO_OCTET;
 293                 p8->pkey->type = V_ASN1_SEQUENCE;
 294                 return p8;
 295                 break;
 296
 297                 default:
 298                 EVPerr(EVP_F_EVP_PKCS8_SET_BROKEN,EVP_R_PKCS8_UNKNOWN_BROKEN_TYPE);
 299                 return NULL;
 300                 break;
 301
 302         }
 303 }
 304
 305 #ifndef OPENSSL_NO_DSA
 306 static int dsa_pkey2pkcs8(PKCS8_PRIV_KEY_INFO *p8, EVP_PKEY *pkey)
 307 {
 308         ASN1_STRING *params;
 309         ASN1_INTEGER *prkey;
 310         ASN1_TYPE *ttmp;
 311         STACK_OF(ASN1_TYPE) *ndsa;
 312         unsigned char *p, *q;
 313         int len;
 314
 315         p8->pkeyalg->algorithm = OBJ_nid2obj(NID_dsa);
 316         len = i2d_DSAparams (pkey->pkey.dsa, NULL);
 317         if (!(p = OPENSSL_malloc(len))) {
 318                 EVPerr(EVP_F_EVP_PKEY2PKCS8,ERR_R_MALLOC_FAILURE);
 319                 PKCS8_PRIV_KEY_INFO_free (p8);
 320                 return 0;
 321         }
 322         q = p;
 323         i2d_DSAparams (pkey->pkey.dsa, &q);
 324         params = ASN1_STRING_new();
 325         ASN1_STRING_set(params, p, len);
 326         OPENSSL_free(p);
 327         /* Get private key into integer */
 328         if (!(prkey = BN_to_ASN1_INTEGER (pkey->pkey.dsa->priv_key, NULL))) {
 329                 EVPerr(EVP_F_EVP_PKEY2PKCS8,EVP_R_ENCODE_ERROR);
 330                 return 0;
 331         }
 332
 333         switch(p8->broken) {
 334
 335                 case PKCS8_OK:
 336                 case PKCS8_NO_OCTET:
 337
 338                 if (!ASN1_pack_string((char *)prkey, i2d_ASN1_INTEGER,
 339                                          &p8->pkey->value.octet_string)) {
 340                         EVPerr(EVP_F_EVP_PKEY2PKCS8,ERR_R_MALLOC_FAILURE);
 341                         M_ASN1_INTEGER_free (prkey);
 342                         return 0;
 343                 }
 344
 345                 M_ASN1_INTEGER_free (prkey);
 346                 p8->pkeyalg->parameter->value.sequence = params;
 347                 p8->pkeyalg->parameter->type = V_ASN1_SEQUENCE;
 348
 349                 break;
 350
 351                 case PKCS8_NS_DB:
 352
 353                 p8->pkeyalg->parameter->value.sequence = params;
 354                 p8->pkeyalg->parameter->type = V_ASN1_SEQUENCE;
 355                 ndsa = sk_ASN1_TYPE_new_null();
 356                 ttmp = ASN1_TYPE_new();
 357                 if (!(ttmp->value.integer = BN_to_ASN1_INTEGER (pkey->pkey.dsa->pub_key, NULL))) {
 358                         EVPerr(EVP_F_EVP_PKEY2PKCS8,EVP_R_ENCODE_ERROR);
 359                         PKCS8_PRIV_KEY_INFO_free(p8);
 360                         return 0;
 361                 }
 362                 ttmp->type = V_ASN1_INTEGER;
 363                 sk_ASN1_TYPE_push(ndsa, ttmp);
 364
 365                 ttmp = ASN1_TYPE_new();
 366                 ttmp->value.integer = prkey;
 367                 ttmp->type = V_ASN1_INTEGER;
 368                 sk_ASN1_TYPE_push(ndsa, ttmp);
 369
 370                 p8->pkey->value.octet_string = ASN1_OCTET_STRING_new();
 371
 372                 if (!ASN1_seq_pack_ASN1_TYPE(ndsa, i2d_ASN1_TYPE,
 373                                          &p8->pkey->value.octet_string->data,
 374                                          &p8->pkey->value.octet_string->length)) {
 375
 376                         EVPerr(EVP_F_EVP_PKEY2PKCS8,ERR_R_MALLOC_FAILURE);
 377                         sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
 378                         M_ASN1_INTEGER_free(prkey);
 379                         return 0;
 380                 }
 381                 sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
 382                 break;
 383
 384                 case PKCS8_EMBEDDED_PARAM:
 385
 386                 p8->pkeyalg->parameter->type = V_ASN1_NULL;
 387                 ndsa = sk_ASN1_TYPE_new_null();
 388                 ttmp = ASN1_TYPE_new();
 389                 ttmp->value.sequence = params;
 390                 ttmp->type = V_ASN1_SEQUENCE;
 391                 sk_ASN1_TYPE_push(ndsa, ttmp);
 392
 393                 ttmp = ASN1_TYPE_new();
 394                 ttmp->value.integer = prkey;
 395                 ttmp->type = V_ASN1_INTEGER;
 396                 sk_ASN1_TYPE_push(ndsa, ttmp);
 397
 398                 p8->pkey->value.octet_string = ASN1_OCTET_STRING_new();
 399
 400                 if (!ASN1_seq_pack_ASN1_TYPE(ndsa, i2d_ASN1_TYPE,
 401                                          &p8->pkey->value.octet_string->data,
 402                                          &p8->pkey->value.octet_string->length)) {
 403
 404                         EVPerr(EVP_F_EVP_PKEY2PKCS8,ERR_R_MALLOC_FAILURE);
 405                         sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
 406                         M_ASN1_INTEGER_free (prkey);
 407                         return 0;
 408                 }
 409                 sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
 410                 break;
 411         }
 412         return 1;
 413 }
 414 #endif