41 lines
854 B
Go
41 lines
854 B
Go
// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package sha3
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import (
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"crypto/subtle"
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"encoding/binary"
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"unsafe"
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"golang.org/x/sys/cpu"
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)
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// xorIn xors the bytes in buf into the state.
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func xorIn(d *state, buf []byte) {
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if cpu.IsBigEndian {
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for i := 0; len(buf) >= 8; i++ {
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a := binary.LittleEndian.Uint64(buf)
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d.a[i] ^= a
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buf = buf[8:]
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}
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} else {
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ab := (*[25 * 64 / 8]byte)(unsafe.Pointer(&d.a))
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subtle.XORBytes(ab[:], ab[:], buf)
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}
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}
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// copyOut copies uint64s to a byte buffer.
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func copyOut(d *state, b []byte) {
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if cpu.IsBigEndian {
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for i := 0; len(b) >= 8; i++ {
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binary.LittleEndian.PutUint64(b, d.a[i])
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b = b[8:]
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}
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} else {
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ab := (*[25 * 64 / 8]byte)(unsafe.Pointer(&d.a))
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copy(b, ab[:])
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}
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}
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