package org.bouncycastle.jcajce.provider.asymmetric.util;
import java.util.HashSet;
import java.util.Set;
import org.bouncycastle.asn1.oiw.OIWObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.util.Strings;
public class DESUtil
{
private static final Set<String> des = new HashSet<String>();
static
{
des.add("DES");
des.add("DESEDE");
des.add(OIWObjectIdentifiers.desCBC.getId());
des.add(PKCSObjectIdentifiers.des_EDE3_CBC.getId());
des.add(PKCSObjectIdentifiers.des_EDE3_CBC.getId());
des.add(PKCSObjectIdentifiers.id_alg_CMS3DESwrap.getId());
}
public static boolean isDES(String algorithmID)
{
String name = Strings.toUpperCase(algorithmID);
return des.contains(name);
}
public static void setOddParity(
byte[] bytes)
{
for (int i = 0; i < bytes.length; i++)
{
int b = bytes[i];
bytes[i] = (byte)((b & 0xfe) |
((((b >> 1) ^
(b >> 2) ^
(b >> 3) ^
(b >> 4) ^
(b >> 5) ^
(b >> 6) ^
(b >> 7)) ^ 0x01) & 0x01));
}
}
}