1.\" $OpenBSD: d2i_BASIC_CONSTRAINTS.3,v 1.3 2018/03/22 21:08:22 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: March 22 2018 $ 18.Dt D2I_BASIC_CONSTRAINTS 3 19.Os 20.Sh NAME 21.Nm d2i_BASIC_CONSTRAINTS , 22.Nm i2d_BASIC_CONSTRAINTS , 23.Nm d2i_EXTENDED_KEY_USAGE , 24.Nm i2d_EXTENDED_KEY_USAGE 25.Nd decode and encode X.509 key usage purposes 26.Sh SYNOPSIS 27.In openssl/x509v3.h 28.Ft BASIC_CONSTRAINTS * 29.Fo d2i_BASIC_CONSTRAINTS 30.Fa "BASIC_CONSTRAINTS **val_out" 31.Fa "const unsigned char **der_in" 32.Fa "long length" 33.Fc 34.Ft int 35.Fo i2d_BASIC_CONSTRAINTS 36.Fa "BASIC_CONSTRAINTS *val_in" 37.Fa "unsigned char **der_out" 38.Fc 39.Ft EXTENDED_KEY_USAGE * 40.Fo d2i_EXTENDED_KEY_USAGE 41.Fa "EXTENDED_KEY_USAGE **val_out" 42.Fa "const unsigned char **der_in" 43.Fa "long length" 44.Fc 45.Ft int 46.Fo i2d_EXTENDED_KEY_USAGE 47.Fa "EXTENDED_KEY_USAGE *val_in" 48.Fa "unsigned char **der_out" 49.Fc 50.Sh DESCRIPTION 51These functions decode and encode data structures describing the 52intended purposes that the key contained in an X.509 certificate 53is to be used for. 54For details about the semantics, examples, caveats, and bugs, see 55.Xr ASN1_item_d2i 3 . 56.Pp 57.Fn d2i_BASIC_CONSTRAINTS 58and 59.Fn i2d_BASIC_CONSTRAINTS 60decode and encode an ASN.1 61.Vt BasicConstraints 62structure defined in RFC 5280 section 4.2.1.9. 63.Pp 64.Fn d2i_EXTENDED_KEY_USAGE 65and 66.Fn i2d_EXTENDED_KEY_USAGE 67decode and encode an ASN.1 68.Vt ExtKeyUsageSyntax 69structure defined in RFC 5280 section 4.2.1.12. 70.Sh RETURN VALUES 71.Fn d2i_BASIC_CONSTRAINTS 72and 73.Fn d2i_EXTENDED_KEY_USAGE 74return a 75.Vt BASIC_CONSTRAINTS 76or 77.Vt EXTENDED_KEY_USAGE 78object, respectively, or 79.Dv NULL 80if an error occurs. 81.Pp 82.Fn i2d_BASIC_CONSTRAINTS 83and 84.Fn i2d_EXTENDED_KEY_USAGE 85return the number of bytes successfully encoded or a negative value 86if an error occurs. 87.Sh SEE ALSO 88.Xr ASN1_item_d2i 3 , 89.Xr BASIC_CONSTRAINTS_new 3 , 90.Xr EXTENDED_KEY_USAGE_new 3 , 91.Xr X509_EXTENSION_new 3 92.Sh STANDARDS 93RFC 5280: Internet X.509 Public Key Infrastructure Certificate and 94Certificate Revocation List (CRL) Profile 95.Sh HISTORY 96.Fn d2i_BASIC_CONSTRAINTS 97and 98.Fn i2d_BASIC_CONSTRAINTS 99first appeared in OpenSSL 0.9.2b and have been available since 100.Ox 2.6 . 101.Pp 102.Fn d2i_EXTENDED_KEY_USAGE 103and 104.Fn i2d_EXTENDED_KEY_USAGE 105first appeared in OpenSSL 0.9.7 and have been available since 106.Ox 3.2 . 107