protected void engineSetPadding(String padding) throws NoSuchPaddingException {
String paddingName = Strings.toUpperCase(padding);
if (paddingName.equals("NOPADDING")) {
cipher = new BufferedBlockCipher(cipher.getUnderlyingCipher());
} else if (paddingName.equals("PKCS5PADDING")
|| paddingName.equals("PKCS7PADDING")
|| paddingName.equals("ISO10126PADDING")) {
cipher = new PaddedBufferedBlockCipher(cipher.getUnderlyingCipher());
} else if (paddingName.equals("WITHCTS")) {
cipher = new CTSBlockCipher(cipher.getUnderlyingCipher());
} else {
throw new NoSuchPaddingException("Padding " + padding + " unknown.");
}
}
protected void engineSetMode(String mode) {
String modeName = Strings.toUpperCase(mode);
if (modeName.equals("ECB")) {
ivLength = 0;
cipher = new PaddedBufferedBlockCipher(cipher.getUnderlyingCipher());
} else if (modeName.equals("CBC")) {
ivLength = cipher.getUnderlyingCipher().getBlockSize();
cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(cipher.getUnderlyingCipher()));
} else if (modeName.startsWith("OFB")) {
ivLength = cipher.getUnderlyingCipher().getBlockSize();
if (modeName.length() != 3) {
int wordSize = Integer.parseInt(modeName.substring(3));
cipher =
new PaddedBufferedBlockCipher(
new OFBBlockCipher(cipher.getUnderlyingCipher(), wordSize));
} else {
cipher =
new PaddedBufferedBlockCipher(
new OFBBlockCipher(cipher.getUnderlyingCipher(), 8 * cipher.getBlockSize()));
}
} else if (modeName.startsWith("CFB")) {
ivLength = cipher.getUnderlyingCipher().getBlockSize();
if (modeName.length() != 3) {
int wordSize = Integer.parseInt(modeName.substring(3));
cipher =
new PaddedBufferedBlockCipher(
new CFBBlockCipher(cipher.getUnderlyingCipher(), wordSize));
} else {
cipher =
new PaddedBufferedBlockCipher(
new CFBBlockCipher(cipher.getUnderlyingCipher(), 8 * cipher.getBlockSize()));
}
} else {
throw new IllegalArgumentException("can't support mode " + mode);
}
}