public final String getPerformanceSuggestion() {
double prob = MCMCOperator.Utils.getAcceptanceProbability(this);
double targetProb = getTargetAcceptanceProbability();
double sf = OperatorUtils.optimizeScaleFactor(scaleFactor, prob, targetProb);
dr.util.NumberFormatter formatter = new dr.util.NumberFormatter(5);
if (prob < getMinimumGoodAcceptanceLevel()) {
return "Try setting scaleFactor to about " + formatter.format(sf);
} else if (prob > getMaximumGoodAcceptanceLevel()) {
return "Try setting scaleFactor to about " + formatter.format(sf);
} else return "";
}
public byte[] generateWrappedKey(GenericKey encryptionKey) throws OperatorException {
Key contentEncryptionKeySpec = OperatorUtils.getJceKey(encryptionKey);
Cipher keyEncryptionCipher =
helper.createSymmetricWrapper(this.getAlgorithmIdentifier().getAlgorithm());
try {
keyEncryptionCipher.init(Cipher.WRAP_MODE, wrappingKey, random);
return keyEncryptionCipher.wrap(contentEncryptionKeySpec);
} catch (InvalidKeyException e) {
throw new OperatorException("cannot wrap key: " + e.getMessage(), e);
} catch (GeneralSecurityException e) {
throw new OperatorException("cannot wrap key: " + e.getMessage(), e);
}
}