Imported Upstream version 4.8.0.309

Former-commit-id: 5f9c6ae75f295e057a7d2971f3a6df4656fa8850

external/boringssl/ssl/test/runner/deterministic.go

@@ -0,0 +1,37 @@
+// Copyright (c) 2016, Google Inc.
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
+
+package runner
+
+import (
+	"encoding/binary"
+)
+
+// Use a different key from crypto/rand/deterministic.c.
+var deterministicRandKey = []byte("runner deterministic key 0123456")
+
+type deterministicRand struct {
+	numCalls uint64
+}
+
+func (d *deterministicRand) Read(buf []byte) (int, error) {
+	for i := range buf {
+		buf[i] = 0
+	}
+	var nonce [12]byte
+	binary.LittleEndian.PutUint64(nonce[:8], d.numCalls)
+	chaCha20(buf, buf, deterministicRandKey, nonce[:], 0)
+	d.numCalls++
+	return len(buf), nil
+}