/**
* Returns a {@code Set} of all registered algorithms for the specified
* cryptographic service. {@code "Signature"}, {@code "Cipher"} and {@code
* "KeyStore"} are examples for such kind of services.
*
* @param serviceName
* the case-insensitive name of the service.
* @return a {@code Set} of all registered algorithms for the specified
* cryptographic service, or an empty {@code Set} if {@code
* serviceName} is {@code null} or if no registered provider
* provides the requested service.
*/
public static java.util.Set <String> getAlgorithms(String serviceName)
{
java.util.HashSet <String> result = new java.util.HashSet <String>();
Provider[] p = getProviders();
for (int i = 0; i < p.Length; i++)
{
for (java.util.Iterator <Provider.Service> it = p[i].getServices().iterator(); it.hasNext();)
{
Provider.Service s = (Provider.Service)it.next();
if (Util.equalsIgnoreCase(s.getType(), serviceName))
{
result.add(s.getAlgorithm());
}
}
}
return(result);
}
/*
* Constructs a new instance of {@code SecureRandom}. An implementation for
* the highest-priority provider is returned. The constructed instance will
* not have been seeded.
*/
public SecureRandom() : base(0)
{
Provider.Service service = findService();
if (service == null)
{
this.provider = null;
this.secureRandomSpi = new SHA1PRNG_SecureRandomImpl();
this.algorithm = "SHA1PRNG"; //$NON-NLS-1$
}
else
{
try {
this.provider = service.getProvider();
this.secureRandomSpi = (SecureRandomSpi)service.newInstance(null);
this.algorithm = service.getAlgorithm();
} catch (java.lang.Exception e) {
throw new RuntimeException(e);
}
}
}
