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