package org.bouncycastle.pqc.crypto.xmss;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
/**
* WOTS+ OID class.
*
*/
public final class WOTSPlusOid implements XMSSOid {
/**
* XMSS OID lookup table.
*/
private static final Map<String, WOTSPlusOid> oidLookupTable;
static {
Map<String, WOTSPlusOid> map = new HashMap<String, WOTSPlusOid>();
map.put(createKey("SHA-256", 32, 16, 67), new WOTSPlusOid(0x01000001, "WOTSP_SHA2-256_W16"));
map.put(createKey("SHA-512", 64, 16, 131), new WOTSPlusOid(0x02000002, "WOTSP_SHA2-512_W16"));
map.put(createKey("SHAKE128", 32, 16, 67), new WOTSPlusOid(0x03000003, "WOTSP_SHAKE128_W16"));
map.put(createKey("SHAKE256", 64, 16, 131), new WOTSPlusOid(0x04000004, "WOTSP_SHAKE256_W16"));
oidLookupTable = Collections.unmodifiableMap(map);
}
/**
* OID.
*/
private final int oid;
/**
* String representation of OID.
*/
private final String stringRepresentation;
/**
* Constructor...
*
* @param oid
* OID.
* @param stringRepresentation
* String representation of OID.
*/
private WOTSPlusOid(int oid, String stringRepresentation) {
super();
this.oid = oid;
this.stringRepresentation = stringRepresentation;
}
/**
* Lookup OID.
*
* @param algorithmName
* Algorithm name.
* @param winternitzParameter
* Winternitz parameter.
* @return WOTS+ OID if parameters were found, null else.
*/
protected static WOTSPlusOid lookup(String algorithmName, int digestSize, int winternitzParameter, int len) {
if (algorithmName == null) {
throw new NullPointerException("algorithmName == null");
}
return oidLookupTable.get(createKey(algorithmName, digestSize, winternitzParameter, len));
}
/**
* Create a key based on parameters.
*
* @param algorithmName
* Algorithm name.
* @param winternitzParameter
* Winternitz Parameter.
* @return String representation of parameters for lookup table.
*/
private static String createKey(String algorithmName, int digestSize, int winternitzParameter, int len) {
if (algorithmName == null) {
throw new NullPointerException("algorithmName == null");
}
return algorithmName + "-" + digestSize + "-" + winternitzParameter + "-" + len;
}
/**
* Getter OID.
*
* @return OID.
*/
public int getOid() {
return oid;
}
public String toString() {
return stringRepresentation;
}
}