1 /* $OpenBSD: x509_skey.c,v 1.1 2020/06/04 15:19:32 jsing 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 static ASN1_OCTET_STRING *s2i_skey_id(X509V3_EXT_METHOD *method,
66     X509V3_CTX *ctx, char *str);
67 
68 const X509V3_EXT_METHOD v3_skey_id = {
69 	.ext_nid = NID_subject_key_identifier,
70 	.ext_flags = 0,
71 	.it = &ASN1_OCTET_STRING_it,
72 	.ext_new = NULL,
73 	.ext_free = NULL,
74 	.d2i = NULL,
75 	.i2d = NULL,
76 	.i2s = (X509V3_EXT_I2S)i2s_ASN1_OCTET_STRING,
77 	.s2i = (X509V3_EXT_S2I)s2i_skey_id,
78 	.i2v = NULL,
79 	.v2i = NULL,
80 	.i2r = NULL,
81 	.r2i = NULL,
82 	.usr_data = NULL,
83 };
84 
85 char *
86 i2s_ASN1_OCTET_STRING(X509V3_EXT_METHOD *method, const ASN1_OCTET_STRING *oct)
87 {
88 	return hex_to_string(oct->data, oct->length);
89 }
90 
91 ASN1_OCTET_STRING *
92 s2i_ASN1_OCTET_STRING(X509V3_EXT_METHOD *method, X509V3_CTX *ctx,
93     const char *str)
94 {
95 	ASN1_OCTET_STRING *oct;
96 	long length;
97 
98 	if (!(oct = ASN1_OCTET_STRING_new())) {
99 		X509V3error(ERR_R_MALLOC_FAILURE);
100 		return NULL;
101 	}
102 
103 	if (!(oct->data = string_to_hex(str, &length))) {
104 		ASN1_OCTET_STRING_free(oct);
105 		return NULL;
106 	}
107 
108 	oct->length = length;
109 
110 	return oct;
111 }
112 
113 static ASN1_OCTET_STRING *
114 s2i_skey_id(X509V3_EXT_METHOD *method, X509V3_CTX *ctx, char *str)
115 {
116 	ASN1_OCTET_STRING *oct;
117 	ASN1_BIT_STRING *pk;
118 	unsigned char pkey_dig[EVP_MAX_MD_SIZE];
119 	unsigned int diglen;
120 
121 	if (strcmp(str, "hash"))
122 		return s2i_ASN1_OCTET_STRING(method, ctx, str);
123 
124 	if (!(oct = ASN1_OCTET_STRING_new())) {
125 		X509V3error(ERR_R_MALLOC_FAILURE);
126 		return NULL;
127 	}
128 
129 	if (ctx && (ctx->flags == CTX_TEST))
130 		return oct;
131 
132 	if (!ctx || (!ctx->subject_req && !ctx->subject_cert)) {
133 		X509V3error(X509V3_R_NO_PUBLIC_KEY);
134 		goto err;
135 	}
136 
137 	if (ctx->subject_req)
138 		pk = ctx->subject_req->req_info->pubkey->public_key;
139 	else
140 		pk = ctx->subject_cert->cert_info->key->public_key;
141 
142 	if (!pk) {
143 		X509V3error(X509V3_R_NO_PUBLIC_KEY);
144 		goto err;
145 	}
146 
147 	if (!EVP_Digest(pk->data, pk->length, pkey_dig, &diglen,
148 	    EVP_sha1(), NULL))
149 		goto err;
150 
151 	if (!ASN1_STRING_set(oct, pkey_dig, diglen)) {
152 		X509V3error(ERR_R_MALLOC_FAILURE);
153 		goto err;
154 	}
155 
156 	return oct;
157 
158 err:
159 	ASN1_OCTET_STRING_free(oct);
160 	return NULL;
161 }
162