1 /*
2 * Copyright (c) 2007, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
24 */
25
26 package java.security.cert;
27
28 import java.io.IOException;
29 import java.io.OutputStream;
30 import java.io.Serializable;
31
32 /**
33 * This interface represents an X.509 extension.
34 *
35 * <p>
36 * Extensions provide a means of associating additional attributes with users
37 * or public keys and for managing a certification hierarchy. The extension
38 * format also allows communities to define private extensions to carry
39 * information unique to those communities.
40 *
41 * <p>
42 * Each extension contains an object identifier, a criticality setting
43 * indicating whether it is a critical or a non-critical extension, and
44 * and an ASN.1 DER-encoded value. Its ASN.1 definition is:
45 *
46 * <pre>
47 *
48 * Extension ::= SEQUENCE {
49 * extnId OBJECT IDENTIFIER,
50 * critical BOOLEAN DEFAULT FALSE,
51 * extnValue OCTET STRING
52 * -- contains a DER encoding of a value
53 * -- of the type registered for use with
54 * -- the extnId object identifier value
55 * }
56 *
57 * </pre>
58 *
59 * <p>
60 * This interface is designed to provide access to a single extension,
61 * unlike {@link java.security.cert.X509Extension} which is more suitable
62 * for accessing a set of extensions.
63 *
64 * @since 1.7
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1 /*
2 * Copyright (c) 2007, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
24 */
25
26 package java.security.cert;
27
28 import java.io.IOException;
29 import java.io.OutputStream;
30 import java.io.Serializable;
31
32 /**
33 * This interface represents an X.509 extension.
34 *
35 * <p>
36 * Extensions provide a means of associating additional attributes with users
37 * or public keys and for managing a certification hierarchy. The extension
38 * format also allows communities to define private extensions to carry
39 * information unique to those communities.
40 *
41 * <p>
42 * Each extension contains an object identifier, a criticality setting
43 * indicating whether it is a critical or a non-critical extension, and
44 * an ASN.1 DER-encoded value. Its ASN.1 definition is:
45 *
46 * <pre>
47 *
48 * Extension ::= SEQUENCE {
49 * extnId OBJECT IDENTIFIER,
50 * critical BOOLEAN DEFAULT FALSE,
51 * extnValue OCTET STRING
52 * -- contains a DER encoding of a value
53 * -- of the type registered for use with
54 * -- the extnId object identifier value
55 * }
56 *
57 * </pre>
58 *
59 * <p>
60 * This interface is designed to provide access to a single extension,
61 * unlike {@link java.security.cert.X509Extension} which is more suitable
62 * for accessing a set of extensions.
63 *
64 * @since 1.7
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