Re: SHA Message Digest Algo not supported by IBM JDK

"Raga" <>
2 Aug 2006 05:54:08 -0700

Paul wrote:

Raga wrote:

Thanks a zillion! It works! :-)

A doubt on the license: is it ok if I bundle the jar provided by Bouncy
Castle with a proprietary product (which isn't a freeware)?

According to this page:
You should be ok, as long as you include the copyright but, I can't
really offer legal advice here.
Try google for "Bouncy Castle license" for some good discussions, best
may be to shoot them an email for clarification


Paul wrote:

Raga wrote:


When I run an application with IBM's JDK, am getting the following
"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?


You must be deploying to WebSphere ;)
I recommend using the BouncyCastle libraries.

Then something simple like the following should get you started:
Add these imports:
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];
        MessageDigest digest = MessageDigest.getInstance("SHA","BC");
        for (int i = 0; i < vals.length; i++)
        hash = digest.digest();
    } catch (Exception e) {
        throw new RuntimeException("Failed to generate secure hash",e);
    return hash;

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