Java RSA Encrypt using .NET XML Key File - need help
- by badMonkey
In .net I have generated the following public key file:
<RSAKeyValue>
<Modulus>xTSiS4+I/x9awUXcF66Ffw7tracsQfGCn6g6k/hGkLquHYMFTCYk4mOB5NwLwqczwvl8HkQfDShGcvrm47XHKUzA8iadWdA5n4toBECzRxiCWCHm1KEg59LUD3fxTG5ogGiNxDj9wSguCIzFdUxBYq5ot2J4iLgGu0qShml5vwk=</Modulus>
<Exponent>AQAB</Exponent>
.NET is happy to encrypt using it's normal methods.
I am trying to use this key to encode a string in Java and am running into an Arithmetic problem (exception) when I attempt to encrypt the string.
The following is the code I am using to encrypt:
byte[] modulusBytes = Base64.decode(this.getString(R.string.public_key_modulus));
byte[] exponentBytes = Base64.decode(this.getString(R.string.public_key_exponent));
BigInteger modulus = new BigInteger( modulusBytes );
BigInteger exponent = new BigInteger( exponentBytes);
RSAPublicKeySpec rsaPubKey = new RSAPublicKeySpec(modulus, exponent);
KeyFactory fact = KeyFactory.getInstance("RSA");
PublicKey pubKey = fact.generatePublic(rsaPubKey);
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, pubKey);
byte[] cipherData = cipher.doFinal( new String("big kitty dancing").getBytes() );
It is the final line in the code block that fails.
I have looked at numerous examples and this is the best I could come up with. If it is not obvious, the R.string.public_key_modulus is a copy/paste of the text in the Modulus element, same applies for exponent.
