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POError while using RSA encryption on BlackBerry
 

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  1. POError while using RSA encryption on BlackBerry
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    <p>I'm trying to use RSA encryption on Blackberry with their native API's. I made a public/private key pair in Java and saved the Modulus and Exponents of the keys as strings so i can generate the keys from this for encryption and decryption. The following code is from the client side and i'm getting a <code>InvalidKeyException</code> and the backtrace is null so I don't know what's happening: </p> <pre><code>public byte[] Encrypt(byte[] data) { try { RSACryptoSystem cryptoSystem = new RSACryptoSystem(1024); RSAPublicKey publicKey = new RSAPublicKey(cryptoSystem, _publicKeyExponent.getBytes(), _publicKeyModulus.getBytes()); RSAEncryptorEngine encryptorEngine = new RSAEncryptorEngine(publicKey); PKCS5FormatterEngine formatterEngine = new PKCS5FormatterEngine( encryptorEngine ); ByteArrayOutputStream output = new ByteArrayOutputStream(); BlockEncryptor encryptor = new BlockEncryptor( formatterEngine, output ); encryptor.write(data); encryptor.close(); output.close(); return output.toByteArray(); } catch (InvalidKeyException e) { // TODO Auto-generated catch block System.out.println(); e.printStackTrace(); } catch (CryptoTokenException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (CryptoUnsupportedOperationException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (UnsupportedCryptoSystemException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; } </code></pre> <p>And this is what i did server side to generate my keys:</p> <pre><code>try { keyPairGenerator = KeyPairGenerator.getInstance("RSA"); keyPairGenerator.initialize(1024); keyFactory = KeyFactory.getInstance("RSA"); } catch (NoSuchAlgorithmException ex) { Logger.getLogger(EncryptorDecryptor.class.getName()).log(Level.SEVERE, null, ex); } keyPair = keyPairGenerator.generateKeyPair(); publicKey = keyPair.getPublic(); privateKey = keyPair.getPrivate(); try { publicKeySpec = keyFactory.getKeySpec(publicKey, RSAPublicKeySpec.class); privateKeySpec = keyFactory.getKeySpec(privateKey, RSAPrivateKeySpec.class); } catch (InvalidKeySpecException ex) { Logger.getLogger(EncryptorDecryptor.class.getName()).log(Level.SEVERE, null, ex); } privateKeyModulus = privateKeySpec.getModulus().toString(); privateKeyExponent = privateKeySpec.getPrivateExponent().toString(); publicKeyModulus = publicKeySpec.getModulus().toString(); publicKeyExponent = publicKeySpec.getPublicExponent().toString(); </code></pre> <p>Any ideas?</p> <p>EDIT: i tried doing a simple test on the server by encrypting and decrypting there and when when I try to decrypt I get a <code>IllegalBlockSizeException</code> these are my encrytion and decryption methods (server side):</p> <pre><code>public byte[] Decrypt(byte[] data) { try { Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.DECRYPT_MODE, privateKey); byte[] cipherData = cipher.doFinal(data); return cipherData; } catch (NoSuchAlgorithmException ex) { Logger.getLogger(EncryptorDecryptor.class.getName()).log(Level.SEVERE, null, ex); } catch (NoSuchPaddingException ex) { Logger.getLogger(EncryptorDecryptor.class.getName()).log(Level.SEVERE, null, ex); } catch(IllegalBlockSizeException ex) { Logger.getLogger(EncryptorDecryptor.class.getName()).log(Level.SEVERE, null, ex); } catch(InvalidKeyException ex) { Logger.getLogger(EncryptorDecryptor.class.getName()).log(Level.SEVERE, null, ex); } catch(BadPaddingException ex) { Logger.getLogger(EncryptorDecryptor.class.getName()).log(Level.SEVERE, null, ex); } return null; } public byte[] Encrypt(byte[] data) { try { Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.ENCRYPT_MODE, publicKey); byte[] cipherData = cipher.doFinal(data); return cipherData; } catch (NoSuchAlgorithmException ex) { Logger.getLogger(EncryptorDecryptor.class.getName()).log(Level.SEVERE, null, ex); } catch (NoSuchPaddingException ex) { Logger.getLogger(EncryptorDecryptor.class.getName()).log(Level.SEVERE, null, ex); } catch(IllegalBlockSizeException ex) { Logger.getLogger(EncryptorDecryptor.class.getName()).log(Level.SEVERE, null, ex); } catch(InvalidKeyException ex) { Logger.getLogger(EncryptorDecryptor.class.getName()).log(Level.SEVERE, null, ex); } catch(BadPaddingException ex) { Logger.getLogger(EncryptorDecryptor.class.getName()).log(Level.SEVERE, null, ex); } return null; } </code></pre> <p>And this is the simple test i'm trying:</p> <pre><code>userName = Base64.encode(encryptorDecryptor.Encrypt(userName.getBytes())); password = Base64.encode(encryptorDecryptor.Encrypt(password.getBytes())); userName = new String(encryptorDecryptor.Decrypt(Base64.decode(userName))); password = new String(encryptorDecryptor.Decrypt(Base64.decode(password))); </code></pre>
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