Reading ASN1 Content

[RaduBogdan98]

Hello community!
Here is my issue:
I am trying to read ASN.1 content from a file. My file content looks like this:

My-Schema DEFINITIONS IMPLICIT TAGS ::=
BEGIN
MySequence ::= SEQUENCE
{
str1 OCTET STRING (SIZE(1..50)),
str2 OCTET STRING (SIZE(1..50)),
str3 OCTET STRING (SIZE(1..50)),
str4 OCTET STRING (SIZE(1..50)),
str5 OCTET STRING (SIZE(1..50))
}
END

I am doing this using the ASN1InputStream class, however I am not able to do it. When reading an object from my stream I always get DLApplicationSpecific and no useful content.

Here is my code:
try {
// Open the .asn1 file using a FileInputStream
FileInputStream inputStream = new FileInputStream("input.asn1");

        // Create an instance of ASN1InputStream using the input stream
        ASN1InputStream asnInputStream = new ASN1InputStream(inputStream);

        // Read the ASN.1 structure from the input stream
        ASN1Primitive asn1Structure = asnInputStream.readObject();

        inputStream.close();
    } catch (IOException e) {
        e.printStackTrace();
    }

What am I doing wrong and how can I manage to read this input correctly?
The Bouncy Castle version I use is 1.70 with jdk 15 on

[peterdettman]

We could help if you provide an example input file. Most likely the file is not a direct BER encoding but has been Hex- or Base64- encoded in some fashion.

[RaduBogdan98]

Hi, so my input file would be this:
input.txt
It is just dummy input, but the idea is that I need to read files in this asn.1 notation, in order to have the posibility to create/edit the file manually. I may define it wrong, please correct me if that is the case.

Do I need to encode it in order to read it by this ASN1InputStream?

[peterdettman]

The ASN1InputStream is for decoding BER encodings. We don't have parsers for ASN.1 module definitions (i.e. abstract syntax).

[RaduBogdan98]

And can I encode this ASN.1 notation to BER using your libraries?

[dghgit]

You'd need to build the actual structure in Java - BC has the support to allow you to describe the generation and encoding of the above in Java. It's not an ASN.1 language parser though, it just supports parsing of the encodings.