How to use the getEncoded() value from keystore?

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jacksu - 04 Feb 2005 22:43 GMT

Hi all,

I get a key from jks keystore. Code looks like

Key key = keystore.getKey("mykey", "mypwd".toCharArray());
System.out.println(key);
byte keyBuf[] = key.getEncoded();

Then how could I use keyBuf to regenerate the same key in another
keystore?

It appears that the key from export is:
RSAMultiPrimePrivateCrtKeySpec

Thanks in advance.

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Mr. Skeptic - 05 Feb 2005 17:38 GMT

Look at key.getFormat() to see what encoding is used. I'm guessing it
is PKCS8 encoding, but if it is not just make some minor modification
to the code fragment below.
Also, you should now what the key algorithm is; you can get this from
the getAlgorithm() method, i.e. String alg = key.getAlgorithm();

Here is one method to recover the key.

KeyFactory kf = KeyFactory.getInstance(alg);
KeySpec ks = new PKCS8EncodedKeySpec(keyBuf);
Key newkey = kf.generatePrivate(ks);
if (kf instanceof RSAMultiPrimePrivateCrtKeySpec)
System.out.println("Sucess");
else
System.out.println("failure");

// newkey should be the same as key.

I haven't actually tried this so I don't know if it will work.

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