1 /* $OpenBSD: x509_skey.c,v 1.2 2021/11/01 20:53:08 tb Exp $ */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3  * project 1999.
4  */
5 /* ====================================================================
6  * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  *
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  *
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in
17  *    the documentation and/or other materials provided with the
18  *    distribution.
19  *
20  * 3. All advertising materials mentioning features or use of this
21  *    software must display the following acknowledgment:
22  *    "This product includes software developed by the OpenSSL Project
23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24  *
25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26  *    endorse or promote products derived from this software without
27  *    prior written permission. For written permission, please contact
28  *    licensing@OpenSSL.org.
29  *
30  * 5. Products derived from this software may not be called "OpenSSL"
31  *    nor may "OpenSSL" appear in their names without prior written
32  *    permission of the OpenSSL Project.
33  *
34  * 6. Redistributions of any form whatsoever must retain the following
35  *    acknowledgment:
36  *    "This product includes software developed by the OpenSSL Project
37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38  *
39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50  * OF THE POSSIBILITY OF SUCH DAMAGE.
51  * ====================================================================
52  *
53  * This product includes cryptographic software written by Eric Young
54  * (eay@cryptsoft.com).  This product includes software written by Tim
55  * Hudson (tjh@cryptsoft.com).
56  *
57  */
58 
59 #include <stdio.h>
60 #include <string.h>
61 
62 #include <openssl/err.h>
63 #include <openssl/x509v3.h>
64 
65 #include "x509_lcl.h"
66 
67 static ASN1_OCTET_STRING *s2i_skey_id(X509V3_EXT_METHOD *method,
68     X509V3_CTX *ctx, char *str);
69 
70 const X509V3_EXT_METHOD v3_skey_id = {
71 	.ext_nid = NID_subject_key_identifier,
72 	.ext_flags = 0,
73 	.it = &ASN1_OCTET_STRING_it,
74 	.ext_new = NULL,
75 	.ext_free = NULL,
76 	.d2i = NULL,
77 	.i2d = NULL,
78 	.i2s = (X509V3_EXT_I2S)i2s_ASN1_OCTET_STRING,
79 	.s2i = (X509V3_EXT_S2I)s2i_skey_id,
80 	.i2v = NULL,
81 	.v2i = NULL,
82 	.i2r = NULL,
83 	.r2i = NULL,
84 	.usr_data = NULL,
85 };
86 
87 char *
88 i2s_ASN1_OCTET_STRING(X509V3_EXT_METHOD *method, const ASN1_OCTET_STRING *oct)
89 {
90 	return hex_to_string(oct->data, oct->length);
91 }
92 
93 ASN1_OCTET_STRING *
94 s2i_ASN1_OCTET_STRING(X509V3_EXT_METHOD *method, X509V3_CTX *ctx,
95     const char *str)
96 {
97 	ASN1_OCTET_STRING *oct;
98 	long length;
99 
100 	if (!(oct = ASN1_OCTET_STRING_new())) {
101 		X509V3error(ERR_R_MALLOC_FAILURE);
102 		return NULL;
103 	}
104 
105 	if (!(oct->data = string_to_hex(str, &length))) {
106 		ASN1_OCTET_STRING_free(oct);
107 		return NULL;
108 	}
109 
110 	oct->length = length;
111 
112 	return oct;
113 }
114 
115 static ASN1_OCTET_STRING *
116 s2i_skey_id(X509V3_EXT_METHOD *method, X509V3_CTX *ctx, char *str)
117 {
118 	ASN1_OCTET_STRING *oct;
119 	ASN1_BIT_STRING *pk;
120 	unsigned char pkey_dig[EVP_MAX_MD_SIZE];
121 	unsigned int diglen;
122 
123 	if (strcmp(str, "hash"))
124 		return s2i_ASN1_OCTET_STRING(method, ctx, str);
125 
126 	if (!(oct = ASN1_OCTET_STRING_new())) {
127 		X509V3error(ERR_R_MALLOC_FAILURE);
128 		return NULL;
129 	}
130 
131 	if (ctx && (ctx->flags == CTX_TEST))
132 		return oct;
133 
134 	if (!ctx || (!ctx->subject_req && !ctx->subject_cert)) {
135 		X509V3error(X509V3_R_NO_PUBLIC_KEY);
136 		goto err;
137 	}
138 
139 	if (ctx->subject_req)
140 		pk = ctx->subject_req->req_info->pubkey->public_key;
141 	else
142 		pk = ctx->subject_cert->cert_info->key->public_key;
143 
144 	if (!pk) {
145 		X509V3error(X509V3_R_NO_PUBLIC_KEY);
146 		goto err;
147 	}
148 
149 	if (!EVP_Digest(pk->data, pk->length, pkey_dig, &diglen,
150 	    EVP_sha1(), NULL))
151 		goto err;
152 
153 	if (!ASN1_STRING_set(oct, pkey_dig, diglen)) {
154 		X509V3error(ERR_R_MALLOC_FAILURE);
155 		goto err;
156 	}
157 
158 	return oct;
159 
160 err:
161 	ASN1_OCTET_STRING_free(oct);
162 	return NULL;
163 }
164