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noSuchAlgorithmException in jsp subroutine. Why?

I am trying to make a routine that encrypts. I found some code that works. When I put the following in-line in my jsp page, it works fine:

String pw = "mypassword";
java.security.MessageDigest d =null;
d = java.security.MessageDigest.getInstance("SHA-1");
d.reset();
d.update(pw.getBytes());

However, I want to make it a function I can call. I've done this before by including code, but this time I'm having trouble. In my main jsp page I have:

<%@ include file="include/crypt.inc"%>

and in include/crypt.inc I have:

<%!
private byte[] pwCrypt(String pw)
{
java.security.MessageDigest d =null;
d = java.security.MessageDigest.getInstance("SHA-1");
d.reset();
d.update(pw.getBytes());
return d.digest();
}
%>

However, when I attempt to load the jsp page I get the following error, even if I don't try to call pwCrypt():

org.apache.jasper.JasperException: Unable to compile class for JSP:

An error occurred at line: 5 in the jsp file: /include/crypt.inc
Unhandled exception type NoSuchAlgorithmException
2: private byte[] pwCrypt(String pw)
3: {
4: java.security.MessageDigest d =null;
5: d = java.security.MessageDigest.getInstance("SHA-1");
6: d.reset();
7: d.update(pw.getBytes());
8: return d.digest();

What am I doing wrong?

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Mark

ASKER

Getting closer. Now it is telling me that I must return a result of type byte[], but the class def. for digest() says it is type byte[]. In my code (see above) I do:

return d.digest();

so what's up now?

org.apache.jasper.JasperException: Unable to compile class for JSP:

An error occurred at line: 2 in the jsp file: /include/crypt.inc
This method must return a result of type byte[]
1: <%!
2: private byte[] pwCrypt(String pw)
3: {
4: try {
5: java.security.MessageDigest d =null;

Mark

ASKER

never mind. I moved the 'return' outside the try/catch block and it works now. Thanks. Here is the final code:

<%!
private byte[] pwCrypt(String pw)
{
java.security.MessageDigest d =null;

try {
d = java.security.MessageDigest.getInstance("SHA-1");
d.reset();
d.update(pw.getBytes());
}
catch (Exception e){
e.printStackTrace();
}

return d.digest();
}
%>