Re: SHA Message Digest Algo not supported by IBM JDK

From:

"Paul" <pauledavis@gmail.com>

Newsgroups:

comp.lang.java.help

Date:

31 Jul 2006 08:50:37 -0700

Message-ID:

<1154361037.003452.70460@h48g2000cwc.googlegroups.com>

Raga wrote:

Hi,

When I run an application with IBM's JDK, am getting the following
exception:
"java.lang.SecurityException: SHA MessageDigest not available"

Any idea on how to create support for this Message Digest algo? One way
is to use provider, I guess. But I don't know how to use a provider &
where to get it from. Any suggestions/thoughts?

Thanks.

You must be deploying to WebSphere ;)
I recommend using the BouncyCastle libraries.
http://www.bouncycastle.org

Then something simple like the following should get you started:
Add these imports:
import java.security.MessageDigest;
import java.security.Security;
import org.bouncycastle.jce.provider.BouncyCastleProvider;

Put this block somewhere in your class:
static {
    Security.addProvider(new BouncyCastleProvider());
}

Try this sample hash method:
public static byte[] hashGenerator(String token, String[] vals)
{
    byte[] hash = new byte[0];
    try
    {
        MessageDigest digest = MessageDigest.getInstance("SHA","BC");
        digest.update(token.getBytes());
        for (int i = 0; i < vals.length; i++)
        {
            digest.update(vals[i].getBytes());
        }
        hash = digest.digest();
    } catch (Exception e) {
        throw new RuntimeException("Failed to generate secure hash",e);
    }
    return hash;
}