storing byte data in char

[smartprogrammer]

i have to calculate 32 bit crc of my 436 byte data and then send 440 bytes on to serial , 436[data] + 4(crc) = 440 [total data]

1) share some reliable and good 32 bit crc code

2) data type to define fine in a cide because char is 2 bytes not one

3) how to time stamp my hex data frame so that i can get calculate my missing

[Wolfgang]

Using the Search function of this forum I found several posts regarding this topic, e.g. this one or this one