code: @Override
  	public Digest createDigestSHA1() {
  		try {
  			return new BCDigest(MessageDigest.getInstance("SHA1", "ZBC"));
  		} catch (GeneralSecurityException e) {
  			AndroidPlatform.getInstance().getLogger().logException(e.getMessage());
  			return null;
  		}
  	}
docs: /* (non-Javadoc)
  @see zorg.platform.CryptoUtils#createDigestSHA1()