How can I construct a java.security.PublicKey object from a base64 encoded string?
Code for the above answer
public static PublicKey getKey(String key){ try{ byte[] byteKey = Base64.decode(key.getBytes(), Base64.DEFAULT); X509EncodedKeySpec X509publicKey = new X509EncodedKeySpec(byteKey); KeyFactory kf = KeyFactory.getInstance("RSA"); return kf.generatePublic(X509publicKey); } catch(Exception e){ e.printStackTrace(); } return null;}
Ok for grins ... try this
- base64 decode the key data to get a byte array (byte[])
- Create a new X509EncodedKeySpec using the byte array
- Get an instance of KeyFactory using KeyFactory.getInstance("RSA") assuming RSA here
- call the method generatePublic(KeySpec) with the X509EncodedKeySpec
- Result /should/ be a public key for your usage.
Try this....
PublicKey getPublicKey(byte[] encodedKey) throws NoSuchAlgorithmException, InvalidKeySpecException{ KeyFactory factory = KeyFactory.getInstance("RSA"); X509EncodedKeySpec encodedKeySpec = new X509EncodedKeySpec(encodedKey); return factory.generatePublic(encodedKeySpec);}