d2i_pr.c revision 306195 
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 "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 "asn1_locl.h"
70
71EVP_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        if (ret->engine) {
86            ENGINE_finish(ret->engine);
87            ret->engine = NULL;
88        }
89#endif
90    }
91
92    if (!EVP_PKEY_set_type(ret, type)) {
93        ASN1err(ASN1_F_D2I_PRIVATEKEY, ASN1_R_UNKNOWN_PUBLIC_KEY_TYPE);
94        goto err;
95    }
96
97    if (!ret->ameth->old_priv_decode ||
98        !ret->ameth->old_priv_decode(ret, &p, length)) {
99        if (ret->ameth->priv_decode) {
100            EVP_PKEY *tmp;
101            PKCS8_PRIV_KEY_INFO *p8 = NULL;
102            p8 = d2i_PKCS8_PRIV_KEY_INFO(NULL, &p, length);
103            if (!p8)
104                goto err;
105            tmp = EVP_PKCS82PKEY(p8);
106            PKCS8_PRIV_KEY_INFO_free(p8);
107            if (tmp == NULL)
108                goto err;
109            EVP_PKEY_free(ret);
110            ret = tmp;
111        } else {
112            ASN1err(ASN1_F_D2I_PRIVATEKEY, ERR_R_ASN1_LIB);
113            goto err;
114        }
115    }
116    *pp = p;
117    if (a != NULL)
118        (*a) = ret;
119    return (ret);
120 err:
121    if ((ret != NULL) && ((a == NULL) || (*a != ret)))
122        EVP_PKEY_free(ret);
123    return (NULL);
124}
125
126/*
127 * This works like d2i_PrivateKey() except it automatically works out the
128 * type
129 */
130
131EVP_PKEY *d2i_AutoPrivateKey(EVP_PKEY **a, const unsigned char **pp,
132                             long length)
133{
134    STACK_OF(ASN1_TYPE) *inkey;
135    const unsigned char *p;
136    int keytype;
137    p = *pp;
138    /*
139     * Dirty trick: read in the ASN1 data into a STACK_OF(ASN1_TYPE): by
140     * analyzing it we can determine the passed structure: this assumes the
141     * input is surrounded by an ASN1 SEQUENCE.
142     */
143    inkey = d2i_ASN1_SEQUENCE_ANY(NULL, &p, length);
144    p = *pp;
145    /*
146     * Since we only need to discern "traditional format" RSA and DSA keys we
147     * can just count the elements.
148     */
149    if (sk_ASN1_TYPE_num(inkey) == 6)
150        keytype = EVP_PKEY_DSA;
151    else if (sk_ASN1_TYPE_num(inkey) == 4)
152        keytype = EVP_PKEY_EC;
153    else if (sk_ASN1_TYPE_num(inkey) == 3) { /* This seems to be PKCS8, not
154                                              * traditional format */
155        PKCS8_PRIV_KEY_INFO *p8 = d2i_PKCS8_PRIV_KEY_INFO(NULL, &p, length);
156        EVP_PKEY *ret;
157
158        sk_ASN1_TYPE_pop_free(inkey, ASN1_TYPE_free);
159        if (!p8) {
160            ASN1err(ASN1_F_D2I_AUTOPRIVATEKEY,
161                    ASN1_R_UNSUPPORTED_PUBLIC_KEY_TYPE);
162            return NULL;
163        }
164        ret = EVP_PKCS82PKEY(p8);
165        PKCS8_PRIV_KEY_INFO_free(p8);
166        if (ret == NULL)
167            return NULL;
168        *pp = p;
169        if (a) {
170            *a = ret;
171        }
172        return ret;
173    } else
174        keytype = EVP_PKEY_RSA;
175    sk_ASN1_TYPE_pop_free(inkey, ASN1_TYPE_free);
176    return d2i_PrivateKey(keytype, a, pp, length);
177}
178