F2                213 lib/sha1.c     #define F2(B,C,D) (B ^ C ^ D)
F2                289 lib/sha256.c   #define F2(A,B,C) ( ( A & B ) | ( C & ( A | B ) ) )
F2                314 lib/sha512.c   #define F2(A, B, C) u64or (u64and (A, B), u64and (C, u64or (A, B)))