UUID Generation

UUIDs are generated according to the following algorithm:

• Determine the values for the UTC-based timestamp and clock sequence to be used in the UUID, as described above.
  
  
• For the purposes of this algorithm, consider the timestamp to be a 60-bit unsigned integer and the clock sequence to be a 14-bit unsigned integer. Sequentially number the bits in a field, starting from 0 (zero) for the least significant bit.
  
  
• Set the time_low field equal to the least significant 32-bits (bits numbered 0 to 31 inclusive) of the time stamp in the same order of significance.
  
  
• Set the time_mid field equal to the bits numbered 32 to 47 inclusive of the time stamp in the same order of significance.
  
  
• Set the 12 least significant bits (bits numbered 0 to 11 inclusive) of the time_hi_and_version field equal to the bits numbered 48 to 59 inclusive of the time stamp in the same order of significance.
  
  
• Set the 4 most significant bits (bits numbered 12 to 15 inclusive) of the time_hi_and_version field to the 4-bit version number corresponding to the UUID version being created, as shown in the table above.
  
  
• Set the clock_seq_low field to the 8 least significant bits (bits numbered 0 to 7 inclusive) of the clock sequence in the same order of significance.
  
  
• Set the 6 least significant bits (bits numbered 0 to 5 inclusive) of the clock_seq_hi_and_reserved field to the 6 most significant bits (bits numbered 8 to 13 inclusive) of the clock sequence in the same order of significance.
  
  
• Set the 2 most significant bits (bits numbered 6 and 7) of the clock_seq_hi_and_reserved to 0 and 1, respectively.
  
  
• Set the node field to the 48-bit IEEE address in the same order of significance as the address.