The BYTE_VECTOR structure encapsulates a variable-length array of octets (or bytes) that are stored consecutively. The BYTE_VECTOR structure is used in the following structures: 

• CHECKSUM structure (section 2.2.5.1.3)

• EXTENSION structure (section 2.2.5.1.4)

• EXCHANGE_MESSAGE structure (section 2.2.6.4)

   struct
   {
     ULONG ByteArrayOffset; 
     ULONG ByteArrayLength; 
   } BYTE_VECTOR; 
  

ByteArrayOffset: A ULONG type array. Each element contains 1 byte.

ByteArrayLength: A ULONG type that contains the length of the ByteArrayOffset field.