tzhash/tz/avx2_inline.go
2019-10-10 11:04:15 +03:00

59 lines
1.3 KiB
Go

// Copyright 2019 (c) NSPCC
//
// This file contains AVX2 implementation with inlined
// assembly calls.
package tz
import (
"hash"
"github.com/nspcc-dev/tzhash/gf127"
)
type digest3 struct {
x [2]gf127.GF127x2
}
// type assertion
var _ hash.Hash = (*digest3)(nil)
func newAVX2Inline() *digest3 {
d := new(digest3)
d.Reset()
return d
}
func (d *digest3) Write(data []byte) (n int, err error) {
n = len(data)
for _, b := range data {
mulByteRightx2(&d.x[0], &d.x[1], b)
}
return
}
func (d *digest3) Sum(in []byte) []byte {
// Make a copy of d so that caller can keep writing and summing.
d0 := *d
h := d0.checkSum()
return append(in, h[:]...)
}
func (d *digest3) Reset() {
d.x[0] = gf127.GF127x2{gf127.GF127{1, 0}, gf127.GF127{0, 0}}
d.x[1] = gf127.GF127x2{gf127.GF127{0, 0}, gf127.GF127{1, 0}}
}
func (d *digest3) Size() int { return hashSize }
func (d *digest3) BlockSize() int { return hashBlockSize }
func (d *digest3) checkSum() (b [hashSize]byte) {
// Matrix is stored transposed,
// but we need to use order consistent with digest.
h := d.x[0].ByteArray()
copy(b[:], h[:16])
copy(b[32:], h[16:])
h = d.x[1].ByteArray()
copy(b[16:], h[:16])
copy(b[48:], h[16:])
return
}
func mulByteRightx2(c00c10 *gf127.GF127x2, c01c11 *gf127.GF127x2, b byte)