38 lines
1.2 KiB
Go
38 lines
1.2 KiB
Go
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// Copyright (c) 2016, Google Inc.
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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package runner
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import (
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"encoding/binary"
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)
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// Use a different key from crypto/rand/deterministic.c.
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var deterministicRandKey = []byte("runner deterministic key 0123456")
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type deterministicRand struct {
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numCalls uint64
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}
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func (d *deterministicRand) Read(buf []byte) (int, error) {
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for i := range buf {
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buf[i] = 0
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}
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var nonce [12]byte
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binary.LittleEndian.PutUint64(nonce[:8], d.numCalls)
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chaCha20(buf, buf, deterministicRandKey, nonce[:], 0)
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d.numCalls++
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return len(buf), nil
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}
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