crypto/asn1/d2i_pr.c

   1 /* crypto/asn1/d2i_pr.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include "internal/cryptlib.h"
  61 #include <openssl/bn.h>
  62 #include <openssl/evp.h>
  63 #include <openssl/objects.h>
  64 #ifndef OPENSSL_NO_ENGINE
  65 # include <openssl/engine.h>
  66 #endif
  67 #include <openssl/x509.h>
  68 #include <openssl/asn1.h>
  69 #include "internal/asn1_int.h"
  70 #include "internal/evp_int.h"
  71
  72 EVP_PKEY *d2i_PrivateKey(int type, EVP_PKEY **a, const unsigned char **pp,
  73                          long length)
  74 {
  75     EVP_PKEY *ret;
  76     const unsigned char *p = *pp;
  77
  78     if ((a == NULL) || (*a == NULL)) {
  79         if ((ret = EVP_PKEY_new()) == NULL) {
  80             ASN1err(ASN1_F_D2I_PRIVATEKEY, ERR_R_EVP_LIB);
  81             return (NULL);
  82         }
  83     } else {
  84         ret = *a;
  85 #ifndef OPENSSL_NO_ENGINE
  86         if (ret->engine) {
  87             ENGINE_finish(ret->engine);
  88             ret->engine = NULL;
  89         }
  90 #endif
  91     }
  92
  93     if (!EVP_PKEY_set_type(ret, type)) {
  94         ASN1err(ASN1_F_D2I_PRIVATEKEY, ASN1_R_UNKNOWN_PUBLIC_KEY_TYPE);
  95         goto err;
  96     }
  97
  98     if (!ret->ameth->old_priv_decode ||
  99         !ret->ameth->old_priv_decode(ret, &p, length)) {
 100         if (ret->ameth->priv_decode) {
 101             PKCS8_PRIV_KEY_INFO *p8 = NULL;
 102             p8 = d2i_PKCS8_PRIV_KEY_INFO(NULL, &p, length);
 103             if (!p8)
 104                 goto err;
 105             EVP_PKEY_free(ret);
 106             ret = EVP_PKCS82PKEY(p8);
 107             PKCS8_PRIV_KEY_INFO_free(p8);
 108             if (ret == NULL)
 109                 goto err;
 110         } else {
 111             ASN1err(ASN1_F_D2I_PRIVATEKEY, ERR_R_ASN1_LIB);
 112             goto err;
 113         }
 114     }
 115     *pp = p;
 116     if (a != NULL)
 117         (*a) = ret;
 118     return (ret);
 119  err:
 120     if (a == NULL || *a != ret)
 121         EVP_PKEY_free(ret);
 122     return (NULL);
 123 }
 124
 125 /*
 126  * This works like d2i_PrivateKey() except it automatically works out the
 127  * type
 128  */
 129
 130 EVP_PKEY *d2i_AutoPrivateKey(EVP_PKEY **a, const unsigned char **pp,
 131                              long length)
 132 {
 133     STACK_OF(ASN1_TYPE) *inkey;
 134     const unsigned char *p;
 135     int keytype;
 136     p = *pp;
 137     /*
 138      * Dirty trick: read in the ASN1 data into a STACK_OF(ASN1_TYPE): by
 139      * analyzing it we can determine the passed structure: this assumes the
 140      * input is surrounded by an ASN1 SEQUENCE.
 141      */
 142     inkey = d2i_ASN1_SEQUENCE_ANY(NULL, &p, length);
 143     p = *pp;
 144     /*
 145      * Since we only need to discern "traditional format" RSA and DSA keys we
 146      * can just count the elements.
 147      */
 148     if (sk_ASN1_TYPE_num(inkey) == 6)
 149         keytype = EVP_PKEY_DSA;
 150     else if (sk_ASN1_TYPE_num(inkey) == 4)
 151         keytype = EVP_PKEY_EC;
 152     else if (sk_ASN1_TYPE_num(inkey) == 3) { /* This seems to be PKCS8, not
 153                                               * traditional format */
 154         PKCS8_PRIV_KEY_INFO *p8 = d2i_PKCS8_PRIV_KEY_INFO(NULL, &p, length);
 155         EVP_PKEY *ret;
 156
 157         sk_ASN1_TYPE_pop_free(inkey, ASN1_TYPE_free);
 158         if (!p8) {
 159             ASN1err(ASN1_F_D2I_AUTOPRIVATEKEY,
 160                     ASN1_R_UNSUPPORTED_PUBLIC_KEY_TYPE);
 161             return NULL;
 162         }
 163         ret = EVP_PKCS82PKEY(p8);
 164         PKCS8_PRIV_KEY_INFO_free(p8);
 165         if (ret == NULL)
 166             return NULL;
 167         *pp = p;
 168         if (a) {
 169             *a = ret;
 170         }
 171         return ret;
 172     } else
 173         keytype = EVP_PKEY_RSA;
 174     sk_ASN1_TYPE_pop_free(inkey, ASN1_TYPE_free);
 175     return d2i_PrivateKey(keytype, a, pp, length);
 176 }