static int get(String algorithm, String mode) throws NoSuchAlgorithmException {
try {
return AlgMode.valueOf(algorithm + "_" + mode).ordinal();
} catch (Exception e) {
throw new NoSuchAlgorithmException(
"Doesn't support algorithm: " + algorithm + " and mode: " + mode);
}
}
/**
* Return an <code>OpensslCipher<code> object that implements the specified
* transformation.
*
* @param transformation the name of the transformation, e.g.,
* AES/CTR/NoPadding.
* @return OpensslCipher an <code>OpensslCipher<code> object
* @throws NoSuchAlgorithmException if <code>transformation</code> is null,
* empty, in an invalid format, or if Openssl doesn't implement the
* specified algorithm.
* @throws NoSuchPaddingException if <code>transformation</code> contains
* a padding scheme that is not available.
*/
public static final OpensslCipher getInstance(String transformation)
throws NoSuchAlgorithmException, NoSuchPaddingException {
Transform transform = tokenizeTransformation(transformation);
int algMode = AlgMode.get(transform.alg, transform.mode);
int padding = Padding.get(transform.padding);
long context = initContext(algMode, padding);
return new OpensslCipher(context, algMode, padding);
}
