chacha_s390x.mx raw

   1  // Copyright 2018 The Go Authors. All rights reserved.
   2  // Use of this source code is governed by a BSD-style
   3  // license that can be found in the LICENSE file.
   4  
   5  //go:build gc && !purego
   6  
   7  package chacha20
   8  
   9  import "golang.org/x/sys/cpu"
  10  
  11  var haveAsm = cpu.S390X.HasVX
  12  
  13  const bufSize = 256
  14  
  15  // xorKeyStreamVX is an assembly implementation of XORKeyStream. It must only
  16  // be called when the vector facility is available. Implementation in asm_s390x.s.
  17  //
  18  //go:noescape
  19  func xorKeyStreamVX(dst, src []byte, key *[8]uint32, nonce *[3]uint32, counter *uint32)
  20  
  21  func (c *Cipher) xorKeyStreamBlocks(dst, src []byte) {
  22  	if cpu.S390X.HasVX {
  23  		xorKeyStreamVX(dst, src, &c.key, &c.nonce, &c.counter)
  24  	} else {
  25  		c.xorKeyStreamBlocksGeneric(dst, src)
  26  	}
  27  }
  28