I have done this succesfull witk package "iaik" 
http://javadoc.iaik.tugraz.at/iaik_jce/current/index.html

            // working iaik convert from DER to ASCII
            
System.out.println(cert.getExtensionValue("1.3.6.1.4.1.15284.10.2.1").toString());
            ASN1Object a1 = 
iaik.asn1.DerCoder.decode(cert.getExtensionValue("1.3.6.1.4.1.15284.10.2.1"));
            OutputStream f0 = new FileOutputStream("file1.txt");
            DerCoder.encodeTo(a1, f0);

now i am stuck because i would really like to do this with mozilla package
this is my code:

            ASN1Value a1 = ASN1Util.decode(OCTET_STRING.getTemplate(), 
cert.getExtensionValue("1.3.6.1.4.1.15284.10.2.1"));

is it possible to get this value in human readable form. I know this is a 8 
digit int number and it was put there from field IA5String a5
i have also tried to cast values :) but naturally without success

            IA5String a5 = (IA5String) a1;
            CharacterString cs = (CharacterString) a5;
            System.out.println( " ----  "+cs.toCharArray());

Blaz P.


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