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View Code? Open in Web Editor NEWC library for DER encoding and decoding
License: GNU Lesser General Public License v3.0
C library for DER encoding and decoding
License: GNU Lesser General Public License v3.0
libwandder -- C library for DER encoding and decoding. Current Stable Version: 2.0.12 --------------------------------------------------------------------------- Copyright (c) 2017-2024 The University of Waikato, Hamilton, New Zealand. All rights reserved. This code was originally developed by the University of Waikato WAND research group. For further information please see http://www.wand.net.nz/. --------------------------------------------------------------------------- See the file COPYING and COPYING.LESSER for full licensing details for this software. Bugs, questions or comments may be sent to [email protected] or filed as issues on the libwandder github page: https://github.com/LibtraceTeam/libwandder Authors: Shane Alcock Tyler Marriner Introduction ============ Libwandder is a helper library that can be used to perform some typical tasks related to the encoding and decoding of data structures defined using the ASN.1 format. This library also includes some routines that are specifically useful for capturing and processing records using the ETSI Lawful Intercept standards. Installation ============ After having installed the required libraries, running the following series of commands should install libwandder ./bootstrap.sh (only if you've cloned the source from GitHub) ./configure make sudo make install By default, libwandder installs to /usr/local - this can be changed by appending the --prefix=<new location> option to ./configure. API === There are two APIs included within libwandder: the generic API and the ETSILI-specific API. Both APIs are extremely under-documented right now, but hopefully this can be addressed sometime soon. The generic API can be accessed by including the header file "libwandder.h". This API can be used to sequentially decode each field in an encoded message, giving the user access to the tag, class, length and values for each decoded field. If the message only uses universal types, the API can also convert the tags and values into printable strings. The generic API has now been extended to support BER encoding, so that users can take advantage of some of the liberties in BER (compared with DER) to gain better encoding performance. Indefinite-length encoding is used for strings, structures and sequences. The ETSILI API can be accessed by including the header file "libwandder_etsili.h". This API can be used to search for certain ETSI-LI fields in the ETSI headers (e.g. timestamp, PDU length) or get a pointer to the start of the actual captured IP payload. The ETSILI API is also capable of decoding and interpreting many of the fields defined in the standard and producing human-readable strings describing each field or encapsulating structure. Please note that the ETSI specification implemented within the libwandder API is not yet complete -- standard IP, UMTS, Email, and IP Multimedia Communication Contents and Intercept Related Information records are supported, but other interception types are still on the TODO list (e.g. SMS messaging, etc).
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