docs: public static byte[] rsAsn1ToPlain(byte[] rsDer) {
  		ASN1Sequence seq = ASN1Sequence.getInstance(rsDer);
  		byte[] r = bigIntToFixexLengthBytes(ASN1Integer.getInstance(seq.getObjectAt(0)).getValue());
  		byte[] s = bigIntToFixexLengthBytes(ASN1Integer.getInstance(seq.getObjectAt(1)).getValue());
  		byte[] result = new byte[RS_LEN * 2];
  		System.arraycopy(r, 0, result, 0, r.length);
  		System.arraycopy(s, 0, result, RS_LEN, s.length);
  		return result;
  	}