mirror of https://github.com/go-gitea/gitea.git
32 lines
745 B
Go
32 lines
745 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 go1.11
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// +build !gccgo
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package chacha20
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const (
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haveAsm = true
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bufSize = 256
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)
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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) xorKeyStreamAsm(dst, src []byte) {
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if len(src) >= bufSize {
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xorKeyStreamVX(dst, src, &c.key, &c.nonce, &c.counter)
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}
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if len(src)%bufSize != 0 {
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i := len(src) - len(src)%bufSize
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c.buf = [bufSize]byte{}
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copy(c.buf[:], src[i:])
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xorKeyStreamVX(c.buf[:], c.buf[:], &c.key, &c.nonce, &c.counter)
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c.len = bufSize - copy(dst[i:], c.buf[:len(src)%bufSize])
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}
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}
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