question: public static String bytesToHex ( byte [ ] bytes , boolean withSpaces ) { StringBuilder sb = new StringBuilder ( ) ; for ( byte hashByte : bytes ) { int intVal = 0xff & hashByte ; if ( intVal < 0x10 ) { sb . append ( '0' ) ; } sb . append ( Integer . toHexString ( intVal ) ) ; if ( withSpaces ) { sb . append ( ' ' ) ; } } return sb . toString ( ) ; }
target:  Takes the provided byte array and converts it into a hexadecimal string with two characters per byte.