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1 | .\" $OpenBSD: EXTENDED_KEY_USAGE_new.3,v 1.6 2021/10/27 11:24:47 schwarze Exp $ | ||
2 | .\" | ||
3 | .\" Copyright (c) 2016 Ingo Schwarze <schwarze@openbsd.org> | ||
4 | .\" | ||
5 | .\" Permission to use, copy, modify, and distribute this software for any | ||
6 | .\" purpose with or without fee is hereby granted, provided that the above | ||
7 | .\" copyright notice and this permission notice appear in all copies. | ||
8 | .\" | ||
9 | .\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | ||
10 | .\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | ||
11 | .\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | ||
12 | .\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | ||
13 | .\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | ||
14 | .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | ||
15 | .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | ||
16 | .\" | ||
17 | .Dd $Mdocdate: October 27 2021 $ | ||
18 | .Dt EXTENDED_KEY_USAGE_NEW 3 | ||
19 | .Os | ||
20 | .Sh NAME | ||
21 | .Nm EXTENDED_KEY_USAGE_new , | ||
22 | .Nm EXTENDED_KEY_USAGE_free | ||
23 | .Nd X.509 key usage restrictions | ||
24 | .Sh SYNOPSIS | ||
25 | .In openssl/x509v3.h | ||
26 | .Ft EXTENDED_KEY_USAGE | ||
27 | .Fn EXTENDED_KEY_USAGE_new void | ||
28 | .Ft void | ||
29 | .Fn EXTENDED_KEY_USAGE_free "EXTENDED_KEY_USAGE *eku" | ||
30 | .Sh DESCRIPTION | ||
31 | By using the key usage extension, the extended key usage extension, | ||
32 | or both of them, | ||
33 | .Vt X509 | ||
34 | end entity certificates may indicate that the key contained in them | ||
35 | is only intended to be used for the specified purposes. | ||
36 | If both extensions are present, only uses compatible with both | ||
37 | extensions are intended. | ||
38 | .Pp | ||
39 | .Fn EXTENDED_KEY_USAGE_new | ||
40 | allocates and initializes an empty | ||
41 | .Vt EXTENDED_KEY_USAGE | ||
42 | object, which is a | ||
43 | .Vt STACK_OF(ASN1_OBJECT) | ||
44 | and represents an ASN.1 | ||
45 | .Vt ExtKeyUsageSyntax | ||
46 | structure defined in RFC 5280 section 4.2.1.12. | ||
47 | It can hold key purpose identifiers. | ||
48 | .Pp | ||
49 | .Fn EXTENDED_KEY_USAGE_free | ||
50 | frees | ||
51 | .Fa eku . | ||
52 | .Pp | ||
53 | The key usage extension uses the ASN.1 BIT STRING data type | ||
54 | and doesn't require any dedicated object. | ||
55 | .Sh RETURN VALUES | ||
56 | .Fn EXTENDED_KEY_USAGE_new | ||
57 | returns the new | ||
58 | .Vt EXTENDED_KEY_USAGE | ||
59 | object or | ||
60 | .Dv NULL | ||
61 | if an error occurs. | ||
62 | .Sh SEE ALSO | ||
63 | .Xr BASIC_CONSTRAINTS_new 3 , | ||
64 | .Xr d2i_EXTENDED_KEY_USAGE 3 , | ||
65 | .Xr POLICYINFO_new 3 , | ||
66 | .Xr X509_check_purpose 3 , | ||
67 | .Xr X509_EXTENSION_new 3 , | ||
68 | .Xr X509_get_extension_flags 3 , | ||
69 | .Xr X509_new 3 | ||
70 | .Sh STANDARDS | ||
71 | RFC 5280: Internet X.509 Public Key Infrastructure Certificate and | ||
72 | Certificate Revocation List (CRL) Profile: | ||
73 | .Bl -dash -compact | ||
74 | .It | ||
75 | section 4.2.1.3: Key Usage | ||
76 | .It | ||
77 | section 4.2.1.12: Extended Key Usage | ||
78 | .El | ||
79 | .Sh HISTORY | ||
80 | .Fn EXTENDED_KEY_USAGE_new | ||
81 | and | ||
82 | .Fn EXTENDED_KEY_USAGE_free | ||
83 | first appeared in OpenSSL 0.9.7 and have been available since | ||
84 | .Ox 3.2 . | ||