How to recover a RSA public key from a byte[] array?

Question

I'm wondering if it's possible to recover a RSA public key that I have converted to byte array previously.

byte[] keyBytes = publicKey.getEncoded();

Thanks for the help.

score 118 · Accepted Answer · edited Apr 28 '12 at 10:26

118

PublicKey publicKey = 
    KeyFactory.getInstance("RSA").generatePublic(new X509EncodedKeySpec(bytes));

edited Apr 28 '12 at 10:26

madth3

answered Mar 09 '10 at 17:45

Bozho

score 45 · Answer 2 · answered Jul 28 '13 at 09:42

45

For others who want to get private key instead of public key from byte array:

PrivateKey privateKey = KeyFactory.getInstance("RSA").generatePrivate(new PKCS8EncodedKeySpec(privateKeyBytes));

answered Jul 28 '13 at 09:42

Marko Kotar

score -1 · Answer 3 · edited May 23 '17 at 12:10

-1

SecretKey key2 = new SecretKeySpec(data, 0, data.length, "DES");

and just worked very well.

edited May 23 '17 at 12:10

Community

answered Sep 16 '14 at 13:24

Adrien

3 Answers3