How to generate a hash value in J2ME?

Question

How can I generate hash value for a byte array, in J2ME?

It doesn't have to be very very secure but it should be fast.

Answer 1

If you already have a dependency on Apache Commons Lang you may as well use HashCodeBuilder:

new HashCodeBuilder().append(bytes).toHashCode();

Answer 2

As suggested by Josh Bloch in his Effective Java book:

public int hashCode() {
   int result = 17;
   for (int i = 0; i < array.length; i++) {
      result = 31*result + (int)array[i];
   }
   return result;
}