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| 1 | .\" $OpenBSD: a2d_ASN1_OBJECT.3,v 1.3 2023/08/09 17:34:39 schwarze Exp $ | ||
| 2 | .\" | ||
| 3 | .\" Copyright (c) 2021 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: August 9 2023 $ | ||
| 18 | .Dt A2D_ASN1_OBJECT 3 | ||
| 19 | .Os | ||
| 20 | .Sh NAME | ||
| 21 | .Nm a2d_ASN1_OBJECT | ||
| 22 | .Nd DER content octets of an ASN.1 object identifier | ||
| 23 | .Sh SYNOPSIS | ||
| 24 | .In openssl/asn1.h | ||
| 25 | .Ft int | ||
| 26 | .Fo a2d_ASN1_OBJECT | ||
| 27 | .Fa "unsigned char *der_out" | ||
| 28 | .Fa "int olen" | ||
| 29 | .Fa "const char *val_in" | ||
| 30 | .Fa "int ilen" | ||
| 31 | .Fc | ||
| 32 | .Sh DESCRIPTION | ||
| 33 | .Fn a2d_ASN1_OBJECT | ||
| 34 | accepts an ASCII string | ||
| 35 | .Fa val_in | ||
| 36 | of | ||
| 37 | .Fa ilen | ||
| 38 | bytes and interprets it as the numerical form of an ASN.1 object identifier. | ||
| 39 | It writes the content octets of the DER encoding of the object identifier | ||
| 40 | to the buffer | ||
| 41 | .Fa der_out | ||
| 42 | which is | ||
| 43 | .Fa olen | ||
| 44 | bytes long. | ||
| 45 | The identifier and length octets of the DER encoding are not written. | ||
| 46 | .Pp | ||
| 47 | If | ||
| 48 | .Fa ilen | ||
| 49 | is \-1, the | ||
| 50 | .Xr strlen 3 | ||
| 51 | of | ||
| 52 | .Fa val_in | ||
| 53 | is used instead. | ||
| 54 | .Pp | ||
| 55 | If | ||
| 56 | .Fa der_out | ||
| 57 | is a | ||
| 58 | .Dv NULL | ||
| 59 | pointer, writing the content octets is skipped | ||
| 60 | and only the return value is calculated. | ||
| 61 | .Sh RETURN VALUES | ||
| 62 | .Fn a2d_ASN1_OBJECT | ||
| 63 | returns the number of content octets that were or would be written or 0 if | ||
| 64 | .Fa ilen | ||
| 65 | is 0, if | ||
| 66 | .Fa val_in | ||
| 67 | is not a valid representation of an object identifier, | ||
| 68 | if memory allocation fails, or if the number of content octets | ||
| 69 | would be larger than | ||
| 70 | .Fa olen . | ||
| 71 | .Sh SEE ALSO | ||
| 72 | .Xr ASN1_OBJECT_new 3 , | ||
| 73 | .Xr i2d_ASN1_OBJECT 3 , | ||
| 74 | .Xr OBJ_create 3 | ||
| 75 | .Sh STANDARDS | ||
| 76 | ITU-T Recommendation X.690, also known as ISO/IEC 8825-1: | ||
| 77 | Information technology - ASN.1 encoding rules: | ||
| 78 | Specification of Basic Encoding Rules (BER), Canonical Encoding | ||
| 79 | Rules (CER) and Distinguished Encoding Rules (DER), | ||
| 80 | section 8.19: Encoding of an object identifier value | ||
| 81 | .Sh HISTORY | ||
| 82 | .Fn a2d_ASN1_OBJECT | ||
| 83 | first appeared in SSLeay 0.8.0 and has been available since | ||
| 84 | .Ox 2.4 . | ||