Michael Munday
b49d69b5da
Based on the SIMD algorithm described in: ChaCha, a variant of Salsa20 by Daniel J. Bernstein https://cr.yp.to/chacha/chacha-20080128.pdf Requires the vector facility (vx). name old speed new speed delta ChaCha20/32 178MB/s ± 0% 174MB/s ± 0% -2.10% (p=0.000 n=9+10) ChaCha20/63 341MB/s ± 0% 337MB/s ± 0% -1.16% (p=0.000 n=10+10) ChaCha20/64 367MB/s ± 0% 335MB/s ± 0% -8.73% (p=0.000 n=10+10) ChaCha20/256 404MB/s ± 0% 1448MB/s ± 0% +258.61% (p=0.000 n=9+10) ChaCha20/1024 410MB/s ± 0% 1568MB/s ± 0% +282.73% (p=0.000 n=9+10) ChaCha20/1350 393MB/s ± 0% 1389MB/s ± 0% +253.58% (p=0.000 n=10+10) ChaCha20/65536 414MB/s ± 0% 1634MB/s ± 0% +294.79% (p=0.000 n=10+10) Change-Id: I9a600fb5ae8ee3f3b81ae6b01cff139c1272d684 Reviewed-on: https://go-review.googlesource.com/35842 Run-TryBot: Michael Munday <mike.munday@ibm.com> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
31 lines
909 B
Go
31 lines
909 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 s390x,!gccgo,!appengine
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package chacha20
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var haveAsm = hasVectorFacility()
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const bufSize = 256
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// hasVectorFacility reports whether the machine supports the vector
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// facility (vx).
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// Implementation in asm_s390x.s.
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func hasVectorFacility() bool
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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.
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// 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, buf *[256]byte, len *int)
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func (c *Cipher) xorKeyStreamAsm(dst, src []byte) {
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xorKeyStreamVX(dst, src, &c.key, &c.nonce, &c.counter, &c.buf, &c.len)
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}
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// EXRL targets, DO NOT CALL!
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func mvcSrcToBuf()
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func mvcBufToDst()
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