public static byte [ ] hexToByteArray ( String hex ) { int length = hex . length ( ) ; byte [ ] result = new byte [ ( length / 2 ) + ( length % 2 ) ] ; for ( int i = length , j = result . length - 1 ; i > 0 ; i -= 2 , j -- ) { result [ j ] = hexToByte ( hex . charAt ( i - 1 ) ) ; if ( i > 1 ) { result [ j ] |= ( hexToByte ( hex . charAt ( i - 2 ) ) << 4 ) ; } } return result ; }
Converts a number expressed in hexadecimal to a byte array .