28 lines
761 B
Go
28 lines
761 B
Go
|
// 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.
|
||
|
|
|
||
|
|
//go:build gc && !purego
|
||
|
|
// +build gc,!purego
|
||
|
|
|
||
|
|
package chacha20
|
||
|
|
|
||
|
|
import "golang.org/x/sys/cpu"
|
||
|
|
|
||
|
|
var haveAsm = cpu.S390X.HasVX
|
||
|
|
|
||
|
|
const bufSize = 256
|
||
|
|
|
||
|
|
// xorKeyStreamVX is an assembly implementation of XORKeyStream. It must only
|
||
|
|
// be called when the vector facility is available. Implementation in asm_s390x.s.
|
||
|
|
//go:noescape
|
||
|
|
func xorKeyStreamVX(dst, src []byte, key *[8]uint32, nonce *[3]uint32, counter *uint32)
|
||
|
|
|
||
|
|
func (c *Cipher) xorKeyStreamBlocks(dst, src []byte) {
|
||
|
|
if cpu.S390X.HasVX {
|
||
|
|
xorKeyStreamVX(dst, src, &c.key, &c.nonce, &c.counter)
|
||
|
|
} else {
|
||
|
|
c.xorKeyStreamBlocksGeneric(dst, src)
|
||
|
|
}
|
||
|
|
}
|