Introduction - If you have any usage issues, please Google them yourself
MD5 algorithm input data to be fill the seats, so that the data bit length LEN 512 modulo result is 448. That data is extended to K* 512+ 448 bits. I.e. K* 64+ 56 bytes, K is an integer.
Specific operations fill the seats: make a 1, then fill 0 to meet those requirements.
Complement Data length:
With a 64-bit digital data representing the original length of B, B is represented by the two 32-bit number. In this case, the number of