Tamir Duberstein
be400aefbc
appengine is obsolete and superseded by purego, and gc is a more precise tag for files that use gc-syntax assembly. Change-Id: I716f59de772ebeee4adf4d2a432edf300122cef0 Reviewed-on: https://go-review.googlesource.com/c/crypto/+/269920 Trust: Ian Lance Taylor <iant@golang.org> Run-TryBot: Filippo Valsorda <filippo@golang.org> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Filippo Valsorda <filippo@golang.org>
27 lines
736 B
Go
27 lines
736 B
Go
// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build gc,!purego
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package chacha20
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import "golang.org/x/sys/cpu"
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var haveAsm = cpu.S390X.HasVX
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const bufSize = 256
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// xorKeyStreamVX is an assembly implementation of XORKeyStream. It must only
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// be called when the vector facility is available. Implementation in asm_s390x.s.
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//go:noescape
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func xorKeyStreamVX(dst, src []byte, key *[8]uint32, nonce *[3]uint32, counter *uint32)
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func (c *Cipher) xorKeyStreamBlocks(dst, src []byte) {
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if cpu.S390X.HasVX {
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xorKeyStreamVX(dst, src, &c.key, &c.nonce, &c.counter)
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} else {
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c.xorKeyStreamBlocksGeneric(dst, src)
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}
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}
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