chacha_s390x.go

     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
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