Construct a public key from raw bytes?

[Tom Katz]

I receieve an RSA Key in raw bytes off the wire. It's a public key which will be used later to trade private keys. I need to construct a Key object from these raw bytes. I"m just now learning how to use the javax.crypto libraries (and BouncingCastle as a provider) and don't see how to generate a key when you already have its raw bytes.

Any help is appreciated...

[Tom Katz]

I don't see a constructor for RSAPublicKeySpec that takes a byte array - which I think is getting closer to what I need to do. Maybe I'm on the wrong track, but I see CTORs for DSE keys that accept raw bytes.

[Tom Katz]

Aha! Turns out the raw bytes contain the modulo and exponent needed in order to create the RSA Key. It helps to read documentation!

[Lin Feng]

If you public key is output format is X.509 , you can use X509EncodedKeySpec to get it back. Just curious , I am wondering why what you got is an public key other than a certification :-) ?

Lin

[Tom Katz]

Well, the encryption setup had already been worked out a couple years ago, using only C/C++ code. I'm the first one to be writing a java client that will integrate the current encryption setup. Dont know if that answers your question.