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