package tz import ( "hash" "github.com/nspcc-dev/tzhash/gf127/avx2" ) type digest3 struct { x [2]avx2.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) if len(data) != 0 { mulByteSliceRightx2(&d.x[0], &d.x[1], n, &data[0]) } 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] = avx2.GF127x2{GF127{1, 0}, GF127{0, 0}} d.x[1] = avx2.GF127x2{GF127{0, 0}, GF127{1, 0}} } func (d *digest3) Size() int { return Size } func (d *digest3) BlockSize() int { return hashBlockSize } func (d *digest3) checkSum() (b [Size]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 mulByteSliceRightx2(c00c10 *avx2.GF127x2, c01c11 *avx2.GF127x2, n int, data *byte)