text: // Copyright 2019 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 !gccgo,!purego
  
  package chacha20
  
  const bufSize = 256
  
  //go:noescape
  func chaCha20_ctr32_vsx(out, inp *byte, len int, key *[8]uint32, counter *uint32)
  
  func (c *Cipher) xorKeyStreamBlocks(dst, src []byte) {
  	chaCha20_ctr32_vsx(&dst[0], &src[0], len(src), &c.key, &c.counter)
  }
  