code: protected byte[] computeSHAdigest(final byte[] value) {
          try {
              return MessageDigest.getInstance("SHA").digest(value);
          } catch (Exception e) {
              throw new UnsupportedOperationException(e.toString());
          }
      }
docs: Returns the SHA-1 message digest of the given value.
  
  @param value
  the value whose SHA message digest must be computed.
  @return the SHA-1 message digest of the given value.