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Decoding DSA Signatures

843810Jul 5 2001 — edited Jul 10 2001
Hello, I am in dire need of help.

I have written code to digitally sign data with DSA, but I am having trouble figuring out how to interpret the signature.

A digital DSA signature is supposed to have an R and an S value. All the examples I have found seem to imply that both R and S should be 20 bytes long, but the signature byte array returned by the sign() method of a signature object is 46 bytes long.

How am I to interpret the 46 bytes. I need the individual R and S values to write to a file!

I have read somewhere that the class sun.security.util.DerValue should be used, but I can't even begin to understand how.

I am at wits end with this problem, so if you know the answer, please email me right away. I will be in your debt.

Thanks very much.

Greg Levonian
gregory@levonian.com
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Locked on Aug 7 2001
Added on Jul 5 2001
#cryptography
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