2 * Copyright (c) 2014 The FreeBSD Foundation
4 * This software was developed by John-Mark Gurney under
5 * the sponsorship of the FreeBSD Foundation and
6 * Rubicon Communications, LLC (Netgate).
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 #define __aligned(x) __attribute__((__aligned__(x)))
37 #define be64dec(buf) __builtin_bswap64(*(uint64_t *)buf)
38 #define be64enc(buf, x) (*(uint64_t *)buf = __builtin_bswap64(x))
40 #include <sys/endian.h>
44 #include <sys/types.h>
50 #define REQ_ALIGN (16 * 4)
52 * The rows are striped across cache lines. Note that the indexes
53 * are bit reversed to make accesses quicker.
56 uint32_t a[16] __aligned(REQ_ALIGN); /* bits 0 - 31 */
57 uint32_t b[16] __aligned(REQ_ALIGN); /* bits 63 - 32 */
58 uint32_t c[16] __aligned(REQ_ALIGN); /* bits 95 - 64 */
59 uint32_t d[16] __aligned(REQ_ALIGN); /* bits 127 - 96 */
60 } __aligned(REQ_ALIGN);
63 * A set of tables that contain h, h^2, h^3, h^4. To be used w/ gf128_mul4.
66 struct gf128table tbls[4];
70 * GCM per spec is bit reversed in memory. So byte 0 is really bit reversed
71 * and contains bits 0-7. We can deal w/ this by using right shifts and
72 * related math instead of having to bit reverse everything. This means that
73 * the low bits are in v[0] (bits 0-63) and reverse order, while the high
74 * bits are in v[1] (bits 64-127) and reverse order. The high bit of v[0] is
75 * bit 0, and the low bit of v[1] is bit 127.
81 /* Note that we don't bit reverse in MAKE_GF128. */
82 #define MAKE_GF128(a, b) ((struct gf128){.v = { (a), (b) } })
83 #define GF128_EQ(a, b) ((((a).v[0] ^ (b).v[0]) | \
84 ((a).v[1] ^ (b).v[1])) == 0)
86 static inline struct gf128
87 gf128_read(const uint8_t *buf)
91 r.v[0] = be64dec(buf);
92 buf += sizeof(uint64_t);
94 r.v[1] = be64dec(buf);
100 gf128_write(struct gf128 v, uint8_t *buf)
104 be64enc(buf, v.v[0]);
107 be64enc(buf, v.v[1]);
110 static inline struct gf128 __pure /* XXX - __pure2 instead */
111 gf128_add(struct gf128 a, struct gf128 b)
119 void gf128_genmultable(struct gf128 h, struct gf128table *t);
120 void gf128_genmultable4(struct gf128 h, struct gf128table4 *t);
121 struct gf128 gf128_mul(struct gf128 v, struct gf128table *tbl);
122 struct gf128 gf128_mul4(struct gf128 a, struct gf128 b, struct gf128 c,
123 struct gf128 d, struct gf128table4 *tbl);
124 struct gf128 gf128_mul4b(struct gf128 r, const uint8_t *v,
125 struct gf128table4 *tbl);
127 #endif /* _GFMULT_H_ */