asn1c:

          asn1c (c = compiler) – tool generates C code for parsing ASN1 (BER, DER, …)

read more: asn1c-usage.pdf, asn1c-quick.pdf

asn1c installation:

Install on own computer (Unix)

sudo apt-get update -y

sudo apt-get install -y asn1c

Or install from: https://github.com/vlm/asn1c


Install on aisa (from Windows)

Connect to aisa.fi.muni.cz using Putty or ssh, with xlogin and faculty password


Create home/local(if does not exist), home/Lab4 (use mkdir)


Copy copy_to_aisa.zip to your home/local  (use WinSCP to copy, or scp)

Change directory                            cd Lab4
Unzip with:                                         unzip copy_to_aisa.zip
Change access permissions:     chmod 777 asn1-install.sh
Install compiler with:                    ./asn1-install.sh


                Test whether installed properly:  asn1c -help










asn1c – basic usage:

0. Define ASN1 grammar - created example sod.asn1

1. Prepare the C and H files (using asn1 compiler) for the ASN.1 structures:

asn1c –fnative-types sod.asn1

Compiled AlgorithmIdentifier.c

Compiled AlgorithmIdentifier.h

Compiled LDSSecurityObjectVersion.c

Compiled LDSSecurityObjectVersion.h

Compiled DigestAlgorithmIdentifier.c

Compiled DigestAlgorithmIdentifier.h

Compiled LDSSecurityObject.c

Compiled LDSSecurityObject.h

Compiled DataGroupHash.c

Compiled DataGroupHash.h

Compiled DataGroupNumber.c

Compiled DataGroupNumber.h

Symlinked /usr/local/share/asn1c/ANY.h -> ANY.h

Symlinked /usr/local/share/asn1c/ANY.c -> ANY.c

Symlinked /usr/local/share/asn1c/INTEGER.h -> INTEGER.h

Symlinked /usr/local/share/asn1c/NativeEnumerated.h -> NativeEnumerated.h

Symlinked /usr/local/share/asn1c/INTEGER.c -> INTEGER.c

2. Use structures in program - sod_sample.c


3.  Compile a sample application:

Remove converter_example.c: rm converter_example.c
Compile: gcc *.c -o LDSview -I. -DPDU=LDSSecurityObject
And execute: ./LDSview

LDSview will parse lds.bin according structure defined in sod.asn1