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package org.uic.barcode.utils;
import java.security.Provider;
import java.security.Provider.Service;
import java.security.Security;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class AlgorithmNameResolver {
public static final String TYPE_KEY_GENERATOR_ALG = "KeyPairGenerator";
public static final String TYPE_SIGNATURE_ALG = "Signature";
private static final Pattern KEY_TYPE_PATTERN = Pattern.compile("^(\\w+)[.].*$");
private static final Pattern KEY_ALIAS_TYPE_PATTERN = Pattern.compile("^Alg[.]Alias[.](\\w+).*$");
private static final Pattern KEY_OID_PATTERN = Pattern.compile(".*?(\\d+(?:[.]\\d+){3,})$");
public static String getSignatureAlgorithmName (String oid) throws Exception {
Provider[] provs = Security.getProviders();
for (Provider prov : provs) {
Service service = prov.getService(AlgorithmNameResolver.TYPE_SIGNATURE_ALG,oid);
if (service != null) {
return service.getAlgorithm();
}
}
return null;
}
public static String getName(String type, String oid) throws Exception {
Provider[] provs = Security.getProviders();
for (Provider prov : provs) {
SortedSet<String> typeAndOID = getTypeAndOIDStrings(prov);
for (String entry : typeAndOID) {
String[] typeAndOIDArray = entry.split("-");
String ptype = typeAndOIDArray[0];
if (ptype.equalsIgnoreCase(type)) {
String poid = typeAndOIDArray[1];
Service pservice = prov.getService(ptype, poid);
String palgo = pservice.getAlgorithm();
if (poid != null && ptype.equalsIgnoreCase(type) && poid.equals(oid)) {
return palgo;
}
}
}
}
if (oid.startsWith("1.2.840.10045")) {
return "ECDSA";
} else if (oid.startsWith("1.2.840.10040")) {
return "DSA";
}
return null;
}
public static String getName(String type, String oid, String providerName) throws Exception {
Provider[] provs = Security.getProviders();
for (Provider prov : provs) {
if (providerName == null || prov.getName().equals(providerName)) {
SortedSet<String> typeAndOID = getTypeAndOIDStrings(prov);
for (String entry : typeAndOID) {
String[] typeAndOIDArray = entry.split("-");
String ptype = typeAndOIDArray[0];
if (ptype.equalsIgnoreCase(type)) {
String poid = typeAndOIDArray[1];
Service pservice = prov.getService(ptype, poid);
String palgo = pservice.getAlgorithm();
if (ptype.equalsIgnoreCase(type) && poid.equals(oid)) {
return palgo;
}
}
}
}
}
if (oid.startsWith("1.2.840.10045")) {
return "ECDSA";
} else if (oid.startsWith("1.2.840.10040")) {
return "DSA";
}
return null;
}
private static SortedSet<String> getTypeAndOIDStrings(Provider prov) {
SortedSet<String> typeAndOID = new TreeSet<>();
Set<Object> keys = prov.keySet();
for (Object key : keys) {
String keyString = key.toString();
Matcher oidMatcher = KEY_OID_PATTERN.matcher(keyString);
if (oidMatcher.matches()) {
// get OID from matched keyString
String oid = oidMatcher.group(1);
// determine type
String type;
Matcher aliasTypeMatcher = KEY_ALIAS_TYPE_PATTERN.matcher(keyString);
if (aliasTypeMatcher.matches()) {
type = aliasTypeMatcher.group(1);
} else {
Matcher typeMatcher = KEY_TYPE_PATTERN.matcher(keyString);
typeMatcher.matches();
type = typeMatcher.group(1);
}
// algorithm parameters are not algorithms, so skip them
if (type.equals("AlgorithmParameters")) {
continue;
}
// auto-removes dupes
typeAndOID.add(type + "-" + oid);
}
}
return typeAndOID;
}
public static String getSecurityNames() throws Exception {
Provider[] provs = Security.getProviders();
StringBuilder sb = new StringBuilder();
for (Provider prov : provs) {
SortedSet<String> typeAndOID = getTypeAndOIDStrings(prov);
for (String entry : typeAndOID) {
String[] typeAndOIDArray = entry.split("-");
String ptype = typeAndOIDArray[0];
String poid = typeAndOIDArray[1];
Service pservice = prov.getService(ptype, poid);
String palgo = "";
if ( pservice != null) {
palgo = pservice.getAlgorithm();
}
sb.append(prov).append(";");
sb.append(ptype).append(";");
sb.append(poid).append(";");
sb.append(palgo).append(";");
sb.append("\r\n");
}
}
return sb.toString();
}
}
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