Listing All Available Cryptographic Services
The providers of cryptographic services such as key generation
algorithms, register their services with the Security class. A
service is represented by a name of the form:
An example of a service entry is SecureRandom.SHA1PRNG.
Here's a sample list of service types:
service-type.service-implementation
// This method returns all available services types
public static String[] getServiceTypes() {
Set result = new HashSet();
// All all providers
Provider[] providers = Security.getProviders();
for (int i=0; i<providers.length; i++) {
// Get services provided by each provider
Set keys = providers[i].keySet();
for (Iterator it=keys.iterator(); it.hasNext(); ) {
String key = (String)it.next();
key = key.split(" ")[0];
if (key.startsWith("Alg.Alias.")) {
// Strip the alias
key = key.substring(10);
}
int ix = key.indexOf('.');
result.add(key.substring(0, ix));
}
}
return (String[])result.toArray(new String[result.size()]);
}
// This method returns the available implementations for a service type
public static String[] getCryptoImpls(String serviceType) {
Set result = new HashSet();
// All all providers
Provider[] providers = Security.getProviders();
for (int i=0; i<providers.length; i++) {
// Get services provided by each provider
Set keys = providers[i].keySet();
for (Iterator it=keys.iterator(); it.hasNext(); ) {
String key = (String)it.next();
key = key.split(" ")[0];
if (key.startsWith(serviceType+".")) {
result.add(key.substring(serviceType.length()+1));
} else if (key.startsWith("Alg.Alias."+serviceType+".")) {
// This is an alias
result.add(key.substring(serviceType.length()+11));
}
}
}
return (String[])result.toArray(new String[result.size()]);
}
AlgorithmParameterGenerator AlgorithmParameters CertPathBuilder CertPathValidator CertStore CertificateFactory Cipher GssApiMechanism KeyAgreement KeyFactory KeyGenerator KeyManagerFactory KeyPairGenerator KeyStore Mac MessageDigest SSLContext SecretKeyFactory SecureRandom Signature TrustManagerFactory
super