What is the type def of generateKey() in DH class?

[pourang]

Hi,

What is the content of NSData that is returned by generateKey() in DH class?
How can I convert it (Public Key) to X509 in order to be used by Java consumer?

Best Regards,
P

[Ashok28]

Would like to see answer for this too.

[pkarc]

Hope is not too late to reply, as the documentation says at https://opensource.apple.com/source/CommonCrypto/CommonCrypto-60027/Source/CommonCryptoSPI/CommonDH.h

It returns a byte string

/*!
    @function   CCDHGenerateKey
    @abstract   Generate the public key for use in a Diffie-Hellman handshake. 
                This value is returned as a byte string.

    @param      ref  The Diffie-Hellman context.
    @result	returns -1 on failure.                 
*/

[soyersoyer]

It's an Octet String as defined in PKCS#3.

https://github.com/st3fan/osx-10.9/blob/master/CommonCrypto-60049/lib/CommonDH.c#L124
https://github.com/samdmarshall/apple-corecrypto/blob/df1ffe4ae19dcb7c320d336d7f5f28c9af6daa09/ccdh/corecrypto/ccdh.h#L331

Maybe the java's X509EncodedKeySpec can use it.