package org.uic.barcode.utils;
import java.security.Provider;
import java.security.Provider.Service;
import java.security.Security;
import java.util.HashMap;
/**
* The Class AlgorithmNameResolver.
*/
public class AlgorithmNameResolver {
/** The Constant TYPE_KEY_GENERATOR_ALG. */
public static final String TYPE_KEY_GENERATOR_ALG = "KeyPairGenerator";
/** The Constant TYPE_SIGNATURE_ALG. */
public static final String TYPE_SIGNATURE_ALG = "Signature";
/** The map. */
private static HashMap<String, HashMap<String, String>> map = new HashMap<String, HashMap<String, String>>();
/**
* Adds an entry for a mapping of algorithm type and oid to an algorithm name
*
* @param type the algorithm type
* @param oid the algorithm OID
* @param name the algorithm name
*/
public static void addMap (String type, String oid, String name) {
if (map.get(type) == null) {
HashMap<String,String> list = new HashMap<String , String>();
list.put(oid, name);
map.put(type, list);
} else {
map.get(type).put(oid, name);
}
}
/**
* Gets the signature algorithm name.
*
* @param oid the oid
* @return the signature algorithm name
* @throws Exception the exception
*/
public static String getSignatureAlgorithmName (String oid) throws Exception {
return getSignatureAlgorithmName (oid, null);
}
/**
* Gets the signature algorithm name.
*
* @param oid the oid
* @param provider the provider
* @return the signature algorithm name
* @throws Exception the exception
*/
public static String getSignatureAlgorithmName (String oid, Provider provider) throws Exception {
return getAlgorithmName(AlgorithmNameResolver.TYPE_SIGNATURE_ALG,oid,provider);
}
/**
* Gets the name.
*
* @param type the type
* @param oid the oid
* @return the name
* @throws Exception the exception
*/
public static String getName (String type, String oid) throws Exception {
return getAlgorithmName(type,oid,null);
}
/**
* Gets the name.
*
* @param type the type
* @param oid the oid
* @param provider the provider
* @return the name
* @throws Exception the exception
*/
public static String getName(String type, String oid, Provider provider) throws Exception {
return getAlgorithmName(type,oid,provider);
}
/**
* Gets the algorithm name.
*
* @param type the type
* @param oid the oid
* @param provider the provider
* @return the algorithm name
* @throws Exception the exception
*/
public static String getAlgorithmName (String type, String oid, Provider provider) throws Exception {
String name = null;
if (provider != null) {
Service service = provider.getService(type,oid);
if (service != null) {
name = service.getAlgorithm();
}
if (name != null && name.length() > 0) {
return name;
}
}
Provider[] provs = Security.getProviders();
for (Provider prov : provs) {
Service service = prov.getService(type,oid);
if (service != null) {
name = service.getAlgorithm();
}
if (name != null && name.length() > 0) {
return name;
}
}
if (map.get(type) != null) {
if (map.get(type).get(oid) != null) {
return map.get(type).get(oid);
}
}
//fallback if the provider did not implement OIDs
if (oid.startsWith("1.2.840.10045.4")) {
return "ECDSA";
} else if (oid.startsWith("1.2.840.10045.3")) {
return "EC";
} else if (oid.startsWith("1.2.840.10045")) {
return "ECDSA";
} else if (oid.startsWith("1.2.840.10040")) {
return "DSA";
}
return null;
}
}
