d2i_pr.c revision 296465 
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#include <openssl/asn1.h>
65#ifndef OPENSSL_NO_RSA
66# include <openssl/rsa.h>
67#endif
68#ifndef OPENSSL_NO_DSA
69# include <openssl/dsa.h>
70#endif
71#ifndef OPENSSL_NO_EC
72# include <openssl/ec.h>
73#endif
74
75EVP_PKEY *d2i_PrivateKey(int type, EVP_PKEY **a, const unsigned char **pp,
76                         long length)
77{
78    EVP_PKEY *ret;
79
80    if ((a == NULL) || (*a == NULL)) {
81        if ((ret = EVP_PKEY_new()) == NULL) {
82            ASN1err(ASN1_F_D2I_PRIVATEKEY, ERR_R_EVP_LIB);
83            return (NULL);
84        }
85    } else
86        ret = *a;
87
88    ret->save_type = type;
89    ret->type = EVP_PKEY_type(type);
90    switch (ret->type) {
91#ifndef OPENSSL_NO_RSA
92    case EVP_PKEY_RSA:
93        /* TMP UGLY CAST */
94        if ((ret->pkey.rsa = d2i_RSAPrivateKey(NULL,
95                                               (const unsigned char **)pp,
96                                               length)) == NULL) {
97            ASN1err(ASN1_F_D2I_PRIVATEKEY, ERR_R_ASN1_LIB);
98            goto err;
99        }
100        break;
101#endif
102#ifndef OPENSSL_NO_DSA
103    case EVP_PKEY_DSA:
104        /* TMP UGLY CAST */
105        if ((ret->pkey.dsa = d2i_DSAPrivateKey(NULL,
106                                               (const unsigned char **)pp,
107                                               length)) == NULL) {
108            ASN1err(ASN1_F_D2I_PRIVATEKEY, ERR_R_ASN1_LIB);
109            goto err;
110        }
111        break;
112#endif
113#ifndef OPENSSL_NO_EC
114    case EVP_PKEY_EC:
115        if ((ret->pkey.ec = d2i_ECPrivateKey(NULL,
116                                             (const unsigned char **)pp,
117                                             length)) == NULL) {
118            ASN1err(ASN1_F_D2I_PRIVATEKEY, ERR_R_ASN1_LIB);
119            goto err;
120        }
121        break;
122#endif
123    default:
124        ASN1err(ASN1_F_D2I_PRIVATEKEY, ASN1_R_UNKNOWN_PUBLIC_KEY_TYPE);
125        goto err;
126        /* break; */
127    }
128    if (a != NULL)
129        (*a) = ret;
130    return (ret);
131 err:
132    if ((ret != NULL) && ((a == NULL) || (*a != ret)))
133        EVP_PKEY_free(ret);
134    return (NULL);
135}
136
137/*
138 * This works like d2i_PrivateKey() except it automatically works out the
139 * type
140 */
141
142EVP_PKEY *d2i_AutoPrivateKey(EVP_PKEY **a, const unsigned char **pp,
143                             long length)
144{
145    STACK_OF(ASN1_TYPE) *inkey;
146    const unsigned char *p;
147    int keytype;
148    p = *pp;
149    /*
150     * Dirty trick: read in the ASN1 data into a STACK_OF(ASN1_TYPE): by
151     * analyzing it we can determine the passed structure: this assumes the
152     * input is surrounded by an ASN1 SEQUENCE.
153     */
154    inkey = d2i_ASN1_SET_OF_ASN1_TYPE(NULL, &p, length, d2i_ASN1_TYPE,
155                                      ASN1_TYPE_free, V_ASN1_SEQUENCE,
156                                      V_ASN1_UNIVERSAL);
157    /*
158     * Since we only need to discern "traditional format" RSA and DSA keys we
159     * can just count the elements.
160     */
161    if (sk_ASN1_TYPE_num(inkey) == 6)
162        keytype = EVP_PKEY_DSA;
163    else if (sk_ASN1_TYPE_num(inkey) == 4)
164        keytype = EVP_PKEY_EC;
165    else
166        keytype = EVP_PKEY_RSA;
167    sk_ASN1_TYPE_pop_free(inkey, ASN1_TYPE_free);
168    return d2i_PrivateKey(keytype, a, pp, length);
169}
170