---
name: "asn1_encode_simple_der"
section: "3"
platform: "linux"
package: "libtasn1"
version: "4.21.0-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/asn1_encode_simple_der"
---

# asn1\_encode\_simple\_der(3)

API function

## NAME

asn1\_encode\_simple\_der - API function

## SYNOPSIS

**#include \<libtasn1.h\>**

**int asn1\_encode\_simple\_der(unsigned int** *etype***, const unsigned char \*** *str***, unsigned int** *str\_len***, unsigned char \*** *tl***, unsigned int \*** *tl\_len***);**

## ARGUMENTS

- unsigned int etype

  The type of the string to be encoded (ASN1\_ETYPE\_)

- const unsigned char \* str

  the string data.

- unsigned int str\_len

  the string length

- unsigned char \* tl

  the encoded tag and length

- unsigned int \* tl\_len

  the bytes of the  *tl* field

## DESCRIPTION

Creates the DER encoding for various simple ASN.1 types like strings etc. It stores the tag and length in  *tl* , which should have space for at least **ASN1\_MAX\_TL\_SIZE** bytes. Initially  *tl\_len* should contain the size of  *tl* .

The complete DER encoding should consist of the value in  *tl* appended with the provided  *str* .

## RETURNS

**ASN1\_SUCCESS** if successful or an error value.

## COPYRIGHT

Copyright © 2006-2025 Free Software Foundation, Inc..\
 Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved.

## SEE ALSO

The full documentation for **libtasn1** is maintained as a Texinfo manual.  If the **info** and **libtasn1** programs are properly installed at your site, the command

-

  **info libtasn1**

should give you access to the complete manual. As an alternative you may obtain the manual from:

-

  **https://www.gnu.org/software/libtasn1/manual/**