JaasSecurityManagerService can show security provider/JCA algorithm information

It may be useful to determine the security providers and the various JCA algorithms installed in the JDK.

So, add two methods to the JaasSecurityManagerService as follows:

• showProviders()
• getAlgorithm(String serviceName)

If the serviceName is null, show all the possible JCA service names.

Here is a partial tested code, that you may want to adapt:
======================================================================================
import java.security.*;
import java.util.*;

public class A
{
public static void main(String[] args)
{
Provider[] providers = Security.getProviders();
for(int i = 0; i < providers.length; i++)

{ System.out.println("Provider="+providers[i].toString()); }

System.out.println("Printing JCA Algorithm Information");
printJCAAlgorithm("Cipher");
printJCAAlgorithm("Signature");
printJCAAlgorithm("KeyFactory");
printJCAAlgorithm("SecretKeyFactory");
printJCAAlgorithm("AlgorithmParameters");
printJCAAlgorithm("MessageDigest");
printJCAAlgorithm("Mac");
}

private static void printJCAAlgorithm(String sName)
{
System.out.println("Printing "+sName);
Set md2 = Security.getAlgorithms(sName);
System.out.println(sName + " set length="+md2.size());
Iterator md2iter = md2.iterator();
while(md2iter.hasNext())

{ System.out.println(md2iter.next().toString()); }

}
}
====================================================================================

The output is:
asaldhana~/testSecurity>java -cp . -Djava.security.manager A
Provider=SUN version 1.5
Provider=SunRsaSign version 1.5
Provider=SunJSSE version 1.5
Provider=SunJCE version 1.5
Provider=SunJGSS version 1.0
Provider=SunSASL version 1.5
Printing JCA Algorithm Information
Printing Cipher
Cipher set length=13
ARCFOUR
PBEWITHSHA1ANDDESEDE
DESEDEWRAP
PBEWITHMD5ANDTRIPLEDES
DESEDE
RSA
AESWRAP
AES
PBEWITHMD5ANDDES
BLOWFISH
DES
RC2
PBEWITHSHA1ANDRC2_40
Printing Signature
Signature set length=9
SHA256WITHRSA
NONEWITHDSA
....

Make the changes in HEAD. I will port it to Branch_4_0 and Branch_3_2