question: private int parseKeyProviderId ( final byte [ ] b , final int off ) throws ParseException { final int bytesToParseLen = b . length - off ; if ( bytesToParseLen >= keyProviderIdLen_ ) { keyProviderId_ = Arrays . copyOfRange ( b , off , off + keyProviderIdLen_ ) ; return keyProviderIdLen_ ; } else { throw new ParseException ( "Not enough bytes to parse key provider id" ) ; } }
target:  Parse the key provider identifier in the provided bytes. It looks for bytes of size defined by the key provider identifier length in the provided bytes starting at the specified off. <p> If successful, it returns the size of the parsed bytes which is the key provider identifier length. On failure, it throws a parse exception.