MD5: Need Advice

[philsmd]

a, b, c, d, 0x80 and the remaining buffers are all 0 (that should be very obvious if you think about it, it must get shorter if we do not use hex but binary instead, it will be halved i.e. 32/2 = 16).

and I already answered the 2nd question (yeah, all hex conversions must be removed and the binary version/buffer must be used instead):

these changes need to be done for all places where you find uint_to_hex_lower8 () calls