forked from TrueCloudLab/tzhash
62 lines
1 KiB
Go
62 lines
1 KiB
Go
package tz
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import (
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"hash"
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)
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type digest4 struct {
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x [4]GF127
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}
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// type assertion
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var _ hash.Hash = (*digest4)(nil)
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func newAVXInline() *digest4 {
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d := new(digest4)
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d.Reset()
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return d
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}
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func (d *digest4) Sum(in []byte) []byte {
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// Make a copy of d so that caller can keep writing and summing.
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d0 := *d
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h := d0.checkSum()
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return append(in, h[:]...)
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}
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func (d *digest4) checkSum() [Size]byte {
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return d.byteArray()
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}
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func (d *digest4) byteArray() (b [Size]byte) {
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copy(b[:], d.x[0].ByteArray())
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copy(b[16:], d.x[1].ByteArray())
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copy(b[32:], d.x[2].ByteArray())
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copy(b[48:], d.x[3].ByteArray())
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return
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}
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func (d *digest4) Reset() {
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d.x[0] = GF127{1, 0}
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d.x[1] = GF127{0, 0}
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d.x[2] = GF127{0, 0}
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d.x[3] = GF127{1, 0}
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}
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func (d *digest4) Write(data []byte) (n int, err error) {
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n = len(data)
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for _, b := range data {
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mulByteRight(&d.x[0], &d.x[1], &d.x[2], &d.x[3], b)
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}
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return
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}
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func (d *digest4) Size() int {
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return Size
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}
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func (d *digest4) BlockSize() int {
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return hashBlockSize
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}
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func mulByteRight(c00, c01, c10, c11 *GF127, b byte)
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