How can I construct a java.security.PublicKey object from a base64 encoded string?

Question

I have a bse64encoded string Public key from external source (Android Store) and I need to use it to verify signed content. How can I convert the string into an instance of

Answer 1

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.