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- // Copyright 2018 The Go Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style
- // license that can be found in the LICENSE file.
-
- // +build go1.11
- // +build !gccgo
-
- package chacha20
-
- const (
- haveAsm = true
- bufSize = 256
- )
-
- //go:noescape
- func xorKeyStreamVX(dst, src []byte, key *[8]uint32, nonce *[3]uint32, counter *uint32)
-
- func (c *Cipher) xorKeyStreamAsm(dst, src []byte) {
-
- if len(src) >= bufSize {
- xorKeyStreamVX(dst, src, &c.key, &c.nonce, &c.counter)
- }
-
- if len(src)%bufSize != 0 {
- i := len(src) - len(src)%bufSize
- c.buf = [bufSize]byte{}
- copy(c.buf[:], src[i:])
- xorKeyStreamVX(c.buf[:], c.buf[:], &c.key, &c.nonce, &c.counter)
- c.len = bufSize - copy(dst[i:], c.buf[:len(src)%bufSize])
- }
- }
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