RSA Encryption: Difference between Java and Android

Question

I am using RSA to encrypt username and password on Android and decrypt them on server (tomcat 6, java 1.6). Android Encryption:

    PublicKey pubKey = readPu         


        

Answer 1

Firstly, it looks like you're initializing both ciphers with the public key. Encryption uses public key, decryption used private key. I hope that's just a typo though.

I had a lot of trouble with RSA encryption as well, much was trial and error. I suggest you try another provider. I managed to implement RSA using BouncyCastle.

Cipher wrapper = Cipher.getInstance("RSA", "BC");
wrapper.init(Cipher.ENCRYPT_MODE, publicKey);
encryptedData= wrapper.doFinal(unencryptedData);

Although, I generated my own keypair since this was a session encryption.

kpg = KeyPairGenerator.getInstance("RSA");
        kpg.initialize(1024);
        KeyPair kp = kpg.genKeyPair();
        publicKey = kp.getPublic();
        privateKey = kp.getPrivate();