curve: move taia related functions into own header

Move them into a separate header, structures and inline functions,
since they are more or less independant of curve.h.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>

1 files changed, 159 insertions, 0 deletions

diff --git a/taia.h b/taia.h
new file mode 100644
index 0000000..227321d
--- /dev/null
+++ b/taia.h
@@ -0,0 +1,159 @@
+#ifndef TAIA_H
+#define TAIA_H
+
+#include <stdint.h>
+
+struct tai {
+	uint64_t x;
+};
+
+struct taia {
+	struct tai sec;
+	uint32_t nano;
+	uint32_t atto;
+};
+
+static inline void tai_pack(unsigned char *s, struct tai *t)
+{
+	uint64_t x;
+
+	x = t->x;
+
+	s[7] = x & 255; x >>= 8;
+	s[6] = x & 255; x >>= 8;
+	s[5] = x & 255; x >>= 8;
+	s[4] = x & 255; x >>= 8;
+	s[3] = x & 255; x >>= 8;
+	s[2] = x & 255; x >>= 8;
+	s[1] = x & 255; x >>= 8;
+	s[0] = x;
+}
+
+static inline void tai_unpack(unsigned char *s, struct tai *t)
+{
+	uint64_t x;
+
+	x = (unsigned char) s[0];
+	x <<= 8; x += (unsigned char) s[1];
+	x <<= 8; x += (unsigned char) s[2];
+	x <<= 8; x += (unsigned char) s[3];
+	x <<= 8; x += (unsigned char) s[4];
+	x <<= 8; x += (unsigned char) s[5];
+	x <<= 8; x += (unsigned char) s[6];
+	x <<= 8; x += (unsigned char) s[7];
+
+	t->x = x;
+}
+
+static inline void taia_pack(unsigned char *s, struct taia *t)
+{
+	unsigned long x;
+
+	tai_pack(s, &t->sec);
+
+	s += 8;
+
+	x = t->atto;
+
+	s[7] = x & 255; x >>= 8;
+	s[6] = x & 255; x >>= 8;
+	s[5] = x & 255; x >>= 8;
+	s[4] = x;
+
+	x = t->nano;
+
+	s[3] = x & 255; x >>= 8;
+	s[2] = x & 255; x >>= 8;
+	s[1] = x & 255; x >>= 8;
+	s[0] = x;
+} 
+
+static inline void taia_unpack(unsigned char *s, struct taia *t)
+{
+	unsigned long x;
+
+	tai_unpack(s, &t->sec);
+
+	s += 8;
+
+	x = (unsigned char) s[4];
+	x <<= 8; x += (unsigned char) s[5];
+	x <<= 8; x += (unsigned char) s[6];
+	x <<= 8; x += (unsigned char) s[7];
+
+	t->atto = x;
+
+	x = (unsigned char) s[0];
+	x <<= 8; x += (unsigned char) s[1];
+	x <<= 8; x += (unsigned char) s[2];
+	x <<= 8; x += (unsigned char) s[3];
+
+	t->nano = x;
+}
+
+#define tai_unix(t, u) ((void) ((t)->x = 4611686018427387914ULL + (uint64_t) (u)))
+
+static inline void taia_now(struct taia *t)
+{
+	struct timeval now;
+
+	gettimeofday(&now, NULL);
+
+	tai_unix(&t->sec, now.tv_sec);
+	t->nano = 1000 * now.tv_usec + 500;
+	t->atto = secrand();
+}
+
+static inline void taia_sub(struct taia *res, const struct taia *u,
+			    const struct taia *v)
+{
+	unsigned long unano = u->nano;
+	unsigned long uatto = u->atto;
+
+	res->sec.x = u->sec.x - v->sec.x;
+	res->nano = unano - v->nano;
+	res->atto = uatto - v->atto;
+
+	if (res->atto > uatto) {
+		res->atto += 1000000000UL;
+		--res->nano;
+	}
+
+	if (res->nano > unano) {
+		res->nano += 1000000000UL;
+		--res->sec.x;
+	}
+}
+
+static inline void taia_add(struct taia *res, const struct taia *u,
+			    const struct taia *v)
+{
+	res->sec.x = u->sec.x + v->sec.x;
+	res->nano = u->nano + v->nano;
+	res->atto = u->atto + v->atto;
+
+	if (res->atto > 999999999UL) {
+		res->atto -= 1000000000UL;
+		++res->nano;
+	}
+
+	if (res->nano > 999999999UL) {
+		res->nano -= 1000000000UL;
+		++res->sec.x;
+	}
+}
+
+static inline int taia_less(const struct taia *t, const struct taia *u)
+{
+	if (t->sec.x < u->sec.x)
+		return 1;
+	if (t->sec.x > u->sec.x)
+		return 0;
+	if (t->nano < u->nano)
+		return 1;
+	if (t->nano > u->nano)
+		return 0;
+	return t->atto < u->atto;
+}
+
+#endif /* TAIA_H */