MFC r300903: Implement SHA-512 truncated (224 and 256 bits)
MFC r292782: Replace sys/crypto/sha2/sha2.c with lib/libmd/sha512c.ccperciva's libmd implementation is 5-30% fasterThe same was done for SHA256 previously in r263218Approved by: secteam
MFC r263863: Dereference nonexistent md2(3) manual.Sponsored by: The FreeBSD Foundation