ghash & poly1305: fix handling of partial blocks and add pad()

pad() aligns the next input to the first byte of a block, which is
useful to implement the IETF version of ChaCha20Poly1305 and AES-GCM.
d343b75e7fFrank Denis committed on 10/5/2020, 9:50:38 PMparent7f7e2d6
2 files changedLine totals unavailable