crypto/asn1/d2i_pr.c

   1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   2  * All rights reserved.
   3  *
   4  * This package is an SSL implementation written
   5  * by Eric Young (eay@cryptsoft.com).
   6  * The implementation was written so as to conform with Netscapes SSL.
   7  *
   8  * This library is free for commercial and non-commercial use as long as
   9  * the following conditions are aheared to.  The following conditions
  10  * apply to all code found in this distribution, be it the RC4, RSA,
  11  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  12  * included with this distribution is covered by the same copyright terms
  13  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  14  *
  15  * Copyright remains Eric Young's, and as such any Copyright notices in
  16  * the code are not to be removed.
  17  * If this package is used in a product, Eric Young should be given attribution
  18  * as the author of the parts of the library used.
  19  * This can be in the form of a textual message at program startup or
  20  * in documentation (online or textual) provided with the package.
  21  *
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions
  24  * are met:
  25  * 1. Redistributions of source code must retain the copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  * 2. Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in the
  29  *    documentation and/or other materials provided with the distribution.
  30  * 3. All advertising materials mentioning features or use of this software
  31  *    must display the following acknowledgement:
  32  *    "This product includes cryptographic software written by
  33  *     Eric Young (eay@cryptsoft.com)"
  34  *    The word 'cryptographic' can be left out if the rouines from the library
  35  *    being used are not cryptographic related :-).
  36  * 4. If you include any Windows specific code (or a derivative thereof) from
  37  *    the apps directory (application code) you must include an acknowledgement:
  38  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  50  * SUCH DAMAGE.
  51  *
  52  * The licence and distribution terms for any publically available version or
  53  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  54  * copied and put under another distribution licence
  55  * [including the GNU Public Licence.]
  56  */
  57
  58 #include <stdio.h>
  59 #include "internal/cryptlib.h"
  60 #include <openssl/bn.h>
  61 #include <openssl/evp.h>
  62 #include <openssl/objects.h>
  63 #ifndef OPENSSL_NO_ENGINE
  64 # include <openssl/engine.h>
  65 #endif
  66 #include <openssl/x509.h>
  67 #include <openssl/asn1.h>
  68 #include "internal/asn1_int.h"
  69 #include "internal/evp_int.h"
  70
  71 EVP_PKEY *d2i_PrivateKey(int type, EVP_PKEY **a, const unsigned char **pp,
  72                          long length)
  73 {
  74     EVP_PKEY *ret;
  75     const unsigned char *p = *pp;
  76
  77     if ((a == NULL) || (*a == NULL)) {
  78         if ((ret = EVP_PKEY_new()) == NULL) {
  79             ASN1err(ASN1_F_D2I_PRIVATEKEY, ERR_R_EVP_LIB);
  80             return (NULL);
  81         }
  82     } else {
  83         ret = *a;
  84 #ifndef OPENSSL_NO_ENGINE
  85         ENGINE_finish(ret->engine);
  86         ret->engine = NULL;
  87 #endif
  88     }
  89
  90     if (!EVP_PKEY_set_type(ret, type)) {
  91         ASN1err(ASN1_F_D2I_PRIVATEKEY, ASN1_R_UNKNOWN_PUBLIC_KEY_TYPE);
  92         goto err;
  93     }
  94
  95     if (!ret->ameth->old_priv_decode ||
  96         !ret->ameth->old_priv_decode(ret, &p, length)) {
  97         if (ret->ameth->priv_decode) {
  98             PKCS8_PRIV_KEY_INFO *p8 = NULL;
  99             p8 = d2i_PKCS8_PRIV_KEY_INFO(NULL, &p, length);
 100             if (!p8)
 101                 goto err;
 102             EVP_PKEY_free(ret);
 103             ret = EVP_PKCS82PKEY(p8);
 104             PKCS8_PRIV_KEY_INFO_free(p8);
 105             if (ret == NULL)
 106                 goto err;
 107         } else {
 108             ASN1err(ASN1_F_D2I_PRIVATEKEY, ERR_R_ASN1_LIB);
 109             goto err;
 110         }
 111     }
 112     *pp = p;
 113     if (a != NULL)
 114         (*a) = ret;
 115     return (ret);
 116  err:
 117     if (a == NULL || *a != ret)
 118         EVP_PKEY_free(ret);
 119     return (NULL);
 120 }
 121
 122 /*
 123  * This works like d2i_PrivateKey() except it automatically works out the
 124  * type
 125  */
 126
 127 EVP_PKEY *d2i_AutoPrivateKey(EVP_PKEY **a, const unsigned char **pp,
 128                              long length)
 129 {
 130     STACK_OF(ASN1_TYPE) *inkey;
 131     const unsigned char *p;
 132     int keytype;
 133     p = *pp;
 134     /*
 135      * Dirty trick: read in the ASN1 data into a STACK_OF(ASN1_TYPE): by
 136      * analyzing it we can determine the passed structure: this assumes the
 137      * input is surrounded by an ASN1 SEQUENCE.
 138      */
 139     inkey = d2i_ASN1_SEQUENCE_ANY(NULL, &p, length);
 140     p = *pp;
 141     /*
 142      * Since we only need to discern "traditional format" RSA and DSA keys we
 143      * can just count the elements.
 144      */
 145     if (sk_ASN1_TYPE_num(inkey) == 6)
 146         keytype = EVP_PKEY_DSA;
 147     else if (sk_ASN1_TYPE_num(inkey) == 4)
 148         keytype = EVP_PKEY_EC;
 149     else if (sk_ASN1_TYPE_num(inkey) == 3) { /* This seems to be PKCS8, not
 150                                               * traditional format */
 151         PKCS8_PRIV_KEY_INFO *p8 = d2i_PKCS8_PRIV_KEY_INFO(NULL, &p, length);
 152         EVP_PKEY *ret;
 153
 154         sk_ASN1_TYPE_pop_free(inkey, ASN1_TYPE_free);
 155         if (!p8) {
 156             ASN1err(ASN1_F_D2I_AUTOPRIVATEKEY,
 157                     ASN1_R_UNSUPPORTED_PUBLIC_KEY_TYPE);
 158             return NULL;
 159         }
 160         ret = EVP_PKCS82PKEY(p8);
 161         PKCS8_PRIV_KEY_INFO_free(p8);
 162         if (ret == NULL)
 163             return NULL;
 164         *pp = p;
 165         if (a) {
 166             *a = ret;
 167         }
 168         return ret;
 169     } else
 170         keytype = EVP_PKEY_RSA;
 171     sk_ASN1_TYPE_pop_free(inkey, ASN1_TYPE_free);
 172     return d2i_PrivateKey(keytype, a, pp, length);
 173 }