Hi Dave,
Thanks for the reply.
I do have access to the server code but cannot change it's implementation to
suite my requirement as the server is serving other clients in other
platforms as well.
Below is the java code to encrypt an AES symmetric key with the public key
it recieves from the client. After encryption, the size of the data is about
176 characters.
public static String encryptAESKey(byte[] aesKeyBytes, String publicKeyStr)
{
String cipherStr = null;
try {
PublicKey pkey = getPublicKey(publicKeyStr);
final Cipher cipher = Cipher.getInstance(RSA_ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, pkey);
byte[] cipherBytes = cipher.doFinal(aesKeyBytes);
cipherStr = Base64.encodeBase64String(cipherBytes);
} catch (Exception e) {
e.printStackTrace();
}
return cipherStr;
}
private static PublicKey getPublicKey(String publicKey) throws
InvalidKeySpecException, NoSuchAlgorithmException {
KeyFactory rsaKeyFac = KeyFactory.getInstance(RSA_ALGORITHM);
byte[] keyBytes = Base64.decodeBase64(publicKey.getBytes());
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
RSAPublicKey rsaPubKey =
(RSAPublicKey)rsaKeyFac.generatePublic(keySpec);
return rsaPubKey;
}
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