123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129 |
- /*-
- * Copyright (c) 2014 The FreeBSD Foundation
- * All rights reserved.
- *
- * This software was developed by John-Mark Gurney under
- * the sponsorship of the FreeBSD Foundation and
- * Rubicon Communications, LLC (Netgate).
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * $FreeBSD$
- *
- */
- #ifndef _GFMULT_H_
- #define _GFMULT_H_
- #ifdef __APPLE__
- #define __aligned(x) __attribute__((__aligned__(x)))
- #define be64dec(buf) __builtin_bswap64(*(uint64_t *)buf)
- #define be64enc(buf, x) (*(uint64_t *)buf = __builtin_bswap64(x))
- #else
- #include <sys/endian.h>
- #endif
- #ifdef _KERNEL
- #include <sys/types.h>
- #else
- #include <stdint.h>
- #include <strings.h>
- #endif
- #define REQ_ALIGN (16 * 4)
- /*
- * The rows are striped across cache lines. Note that the indexes
- * are bit reversed to make accesses quicker.
- */
- struct gf128table {
- uint32_t a[16] __aligned(REQ_ALIGN); /* bits 0 - 31 */
- uint32_t b[16] __aligned(REQ_ALIGN); /* bits 63 - 32 */
- uint32_t c[16] __aligned(REQ_ALIGN); /* bits 95 - 64 */
- uint32_t d[16] __aligned(REQ_ALIGN); /* bits 127 - 96 */
- } __aligned(REQ_ALIGN);
- /*
- * A set of tables that contain h, h^2, h^3, h^4. To be used w/ gf128_mul4.
- */
- struct gf128table4 {
- struct gf128table tbls[4];
- };
- /*
- * GCM per spec is bit reversed in memory. So byte 0 is really bit reversed
- * and contains bits 0-7. We can deal w/ this by using right shifts and
- * related math instead of having to bit reverse everything. This means that
- * the low bits are in v[0] (bits 0-63) and reverse order, while the high
- * bits are in v[1] (bits 64-127) and reverse order. The high bit of v[0] is
- * bit 0, and the low bit of v[1] is bit 127.
- */
- struct gf128 {
- uint64_t v[2];
- };
- /* Note that we don't bit reverse in MAKE_GF128. */
- #define MAKE_GF128(a, b) ((struct gf128){.v = { (a), (b) } })
- #define GF128_EQ(a, b) ((((a).v[0] ^ (b).v[0]) | \
- ((a).v[1] ^ (b).v[1])) == 0)
- static inline struct gf128
- gf128_read(const uint8_t *buf)
- {
- struct gf128 r;
- r.v[0] = be64dec(buf);
- buf += sizeof(uint64_t);
- r.v[1] = be64dec(buf);
- return r;
- }
- static inline void
- gf128_write(struct gf128 v, uint8_t *buf)
- {
- uint64_t tmp;
- be64enc(buf, v.v[0]);
- buf += sizeof tmp;
- be64enc(buf, v.v[1]);
- }
- static inline struct gf128 __pure /* XXX - __pure2 instead */
- gf128_add(struct gf128 a, struct gf128 b)
- {
- a.v[0] ^= b.v[0];
- a.v[1] ^= b.v[1];
- return a;
- }
- void gf128_genmultable(struct gf128 h, struct gf128table *t);
- void gf128_genmultable4(struct gf128 h, struct gf128table4 *t);
- struct gf128 gf128_mul(struct gf128 v, struct gf128table *tbl);
- struct gf128 gf128_mul4(struct gf128 a, struct gf128 b, struct gf128 c,
- struct gf128 d, struct gf128table4 *tbl);
- struct gf128 gf128_mul4b(struct gf128 r, const uint8_t *v,
- struct gf128table4 *tbl);
- #endif /* _GFMULT_H_ */
|