note 17846 deleted from function.session-id by jimw

The last piece that you mentioned for (i = 0; i < 16; i++) sprintf(buf + (i << 1), "%02x", digest[i]); buf[i << 1] = '\0'; causes it to step through the digest array and enter the value of each element into the buffer (buf) as follows (%02x): 0 indicates that the value should be left padded with zeros, 2 indicates that the value should be displayed with 2 places (columns), x indicates that the value should be formated in Hex rather than decimal. This is for storage purposed with C. C stores each character in its own memory location. So as the for loop runs it stores the values in a Hex format 2 "characters" long with a leading zero. The final piece \0 is a null value which must terminate all C "strings".