1/* $OpenBSD: a_pkey.c,v 1.8 2024/04/09 13:52:41 beck Exp $ */
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
61#include <openssl/opensslconf.h>
62
63#include <openssl/asn1.h>
64#include <openssl/bn.h>
65#include <openssl/err.h>
66#include <openssl/evp.h>
67#include <openssl/objects.h>
68#include <openssl/x509.h>
69
70#include "asn1_local.h"
71#include "evp_local.h"
72
73EVP_PKEY *
74d2i_PrivateKey(int type, EVP_PKEY **a, const unsigned char **pp, long length)
75{
76	const unsigned char *p = *pp;
77	EVP_PKEY *ret;
78
79	if ((a == NULL) || (*a == NULL)) {
80		if ((ret = EVP_PKEY_new()) == NULL) {
81			ASN1error(ERR_R_EVP_LIB);
82			return (NULL);
83		}
84	} else {
85		ret = *a;
86	}
87
88	if (!EVP_PKEY_set_type(ret, type)) {
89		ASN1error(ASN1_R_UNKNOWN_PUBLIC_KEY_TYPE);
90		goto err;
91	}
92
93	if (!ret->ameth->old_priv_decode ||
94	    !ret->ameth->old_priv_decode(ret, pp, length)) {
95		if (ret->ameth->priv_decode) {
96			PKCS8_PRIV_KEY_INFO *p8 = NULL;
97			*pp = p; /* XXX */
98			p8 = d2i_PKCS8_PRIV_KEY_INFO(NULL, pp, length);
99			if (!p8)
100				goto err;
101			EVP_PKEY_free(ret);
102			ret = EVP_PKCS82PKEY(p8);
103			PKCS8_PRIV_KEY_INFO_free(p8);
104		} else {
105			ASN1error(ERR_R_ASN1_LIB);
106			goto err;
107		}
108	}
109	if (a != NULL)
110		(*a) = ret;
111	return (ret);
112
113 err:
114	if (a == NULL || *a != ret)
115		EVP_PKEY_free(ret);
116	return (NULL);
117}
118LCRYPTO_ALIAS(d2i_PrivateKey);
119
120int
121i2d_PrivateKey(EVP_PKEY *a, unsigned char **pp)
122{
123	if (a->ameth && a->ameth->old_priv_encode) {
124		return a->ameth->old_priv_encode(a, pp);
125	}
126	if (a->ameth && a->ameth->priv_encode) {
127		PKCS8_PRIV_KEY_INFO *p8 = EVP_PKEY2PKCS8(a);
128		int ret = i2d_PKCS8_PRIV_KEY_INFO(p8, pp);
129		PKCS8_PRIV_KEY_INFO_free(p8);
130		return ret;
131	}
132	ASN1error(ASN1_R_UNSUPPORTED_PUBLIC_KEY_TYPE);
133	return (-1);
134}
135LCRYPTO_ALIAS(i2d_PrivateKey);
136
137/* This works like d2i_PrivateKey() except it automatically works out the type */
138
139EVP_PKEY *
140d2i_AutoPrivateKey(EVP_PKEY **a, const unsigned char **pp, long length)
141{
142	STACK_OF(ASN1_TYPE) *inkey;
143	const unsigned char *p;
144	int keytype;
145
146	p = *pp;
147	/* Dirty trick: read in the ASN1 data into a STACK_OF(ASN1_TYPE):
148	 * by analyzing it we can determine the passed structure: this
149	 * assumes the input is surrounded by an ASN1 SEQUENCE.
150	 */
151	inkey = d2i_ASN1_SEQUENCE_ANY(NULL, &p, length);
152	/* Since we only need to discern "traditional format" RSA and DSA
153	 * keys we can just count the elements.
154         */
155	if (sk_ASN1_TYPE_num(inkey) == 6)
156		keytype = EVP_PKEY_DSA;
157	else if (sk_ASN1_TYPE_num(inkey) == 4)
158		keytype = EVP_PKEY_EC;
159	else if (sk_ASN1_TYPE_num(inkey) == 3)  {
160		/* This seems to be PKCS8, not traditional format */
161		PKCS8_PRIV_KEY_INFO *p8 = d2i_PKCS8_PRIV_KEY_INFO(
162		    NULL, pp, length);
163		EVP_PKEY *ret;
164
165		sk_ASN1_TYPE_pop_free(inkey, ASN1_TYPE_free);
166		if (!p8) {
167			ASN1error(ASN1_R_UNSUPPORTED_PUBLIC_KEY_TYPE);
168			return NULL;
169		}
170		ret = EVP_PKCS82PKEY(p8);
171		PKCS8_PRIV_KEY_INFO_free(p8);
172		if (a) {
173			*a = ret;
174		}
175		return ret;
176	} else
177		keytype = EVP_PKEY_RSA;
178	sk_ASN1_TYPE_pop_free(inkey, ASN1_TYPE_free);
179	return d2i_PrivateKey(keytype, a, pp, length);
180}
181LCRYPTO_ALIAS(d2i_AutoPrivateKey);
182