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October 2001



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PublicKey refuses to regenerate.

Posted by Syed Miftahur rahman on October 07, 2001 at 6:42 PM

Hope you don't mind this mail. I have an interesting problem which might interest you.

We know PublicKey can be encoded into byte-array by using "getEncoded()" method. In my case I found that array size required to store my encoded PublicKey is 444.
Using objectOutputStream's "writebyte(int)" I transferred the byte array to a file in my floppy drive.
I found that I could regenerate the PublicKey by reading back the encoded byte-array using ObjectInputStream's "readByte()" method and then using the following snippets.(where pub is the byte-array i.e
byte[] pub=new byte[444]; containing the encoded bytes)

X509EncodedKeySpec b = new X509EncodedKeySpec(pub);
KeyFactory kf = KeyFactory.getInstance("DSA");
PublicKey j = kf.generatePublic(b);

This has been performing nicely without any problems.
Now I have burned the 444 bytes into an EEPROM. Though the exact data bytes are read back by the program from the EEPROM, I get the following error message:- Inappropriate key specification: IOE
xception: DerInputStream.getLength(): lengthTag=95, too big.
at Advanced_server_frm_eeprom.main(Compiled Code)

Can you give me any suggestions to overcome the problem. Since I have succeeded with Floppy I believe it is possible with EEPROm, just another memory element. It must be just a simple problem which I fail to see and may be, an expert will spot.

Thanking you.
With regards.
Syed Miftahur Rahman.(India).


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