Filippo Valsorda
e0829623af
const KeySize = 32
const NonceSize = 12
func HChaCha20(key, nonce []byte) ([]byte, error)
type Cipher struct {}
func NewUnauthenticatedCipher(key, nonce []byte) (*Cipher, error)
func (s *Cipher) XORKeyStream(dst, src []byte)
Small performance hit in chacha20poly1305, probably due to the loss
of the Advance API, which we might consider adding later. No new
allocations, thanks to the mid-stack inliner.
name old time/op new time/op delta
Chacha20Poly1305/Open-64-8 1.60µs ± 0% 1.68µs ± 1% +4.94% (p=0.000 n=9+10)
Chacha20Poly1305/Seal-64-8 1.56µs ± 0% 1.64µs ± 1% +5.21% (p=0.000 n=8+10)
Chacha20Poly1305/Open-64-X-8 2.10µs ± 1% 2.22µs ± 1% +5.81% (p=0.000 n=10+10)
Chacha20Poly1305/Seal-64-X-8 2.07µs ± 1% 2.17µs ± 0% +4.88% (p=0.000 n=10+10)
Chacha20Poly1305/Open-1350-8 15.4µs ± 0% 15.7µs ± 1% +1.65% (p=0.000 n=10+10)
Chacha20Poly1305/Seal-1350-8 15.6µs ± 2% 15.9µs ± 1% +1.58% (p=0.028 n=10+9)
Chacha20Poly1305/Open-1350-X-8 16.0µs ± 1% 16.3µs ± 2% +2.00% (p=0.000 n=10+10)
Chacha20Poly1305/Seal-1350-X-8 15.9µs ± 0% 16.3µs ± 1% +1.91% (p=0.000 n=10+8)
Chacha20Poly1305/Open-8192-8 85.6µs ± 0% 86.6µs ± 1% +1.21% (p=0.000 n=10+10)
Chacha20Poly1305/Seal-8192-8 85.7µs ± 0% 86.3µs ± 0% +0.68% (p=0.001 n=9+9)
Chacha20Poly1305/Open-8192-X-8 86.4µs ± 1% 87.1µs ± 1% +0.76% (p=0.035 n=10+9)
Chacha20Poly1305/Seal-8192-X-8 86.0µs ± 0% 87.0µs ± 1% +1.14% (p=0.000 n=9+9)
Updates golang/go#24485
Change-Id: I2ec2ef487a03f013049915d9063751c75a78408b
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/185980
Reviewed-by: Michael Munday <mike.munday@ibm.com>
42 lines
1.2 KiB
Go
42 lines
1.2 KiB
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 src the LICENSE file.
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package chacha20
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import "runtime"
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// Platforms that have fast unaligned 32-bit little endian accesses.
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const unaligned = runtime.GOARCH == "386" ||
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runtime.GOARCH == "amd64" ||
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runtime.GOARCH == "arm64" ||
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runtime.GOARCH == "ppc64le" ||
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runtime.GOARCH == "s390x"
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// xor reads a little endian uint32 from src, XORs it with u and
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// places the result in little endian byte order in dst.
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func xor(dst, src []byte, u uint32) {
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_, _ = src[3], dst[3] // eliminate bounds checks
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if unaligned {
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// The compiler should optimize this code into
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// 32-bit unaligned little endian loads and stores.
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// TODO: delete once the compiler does a reliably
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// good job with the generic code below.
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// See issue #25111 for more details.
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v := uint32(src[0])
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v |= uint32(src[1]) << 8
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v |= uint32(src[2]) << 16
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v |= uint32(src[3]) << 24
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v ^= u
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dst[0] = byte(v)
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dst[1] = byte(v >> 8)
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dst[2] = byte(v >> 16)
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dst[3] = byte(v >> 24)
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} else {
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dst[0] = src[0] ^ byte(u)
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dst[1] = src[1] ^ byte(u>>8)
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dst[2] = src[2] ^ byte(u>>16)
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dst[3] = src[3] ^ byte(u>>24)
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}
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}
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