code: @Override
  	public HMAC createHMACSHA1(byte[] hmacKey) throws CryptoException {
  		try {
  			return new BCHmacAdapter(hmacKey, "SHA1");
  		} catch (Exception e) {
  			AndroidPlatform.getInstance().getLogger().logException(e.getMessage());
  			return null;
  		}
  	}
docs: /* (non-Javadoc)
  @see zorg.platform.CryptoUtils#createHMACSHA1(byte[])