62 lines
2.0 KiB
Go
62 lines
2.0 KiB
Go
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// Copyright 2023 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package testutil
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import (
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crand "crypto/rand"
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"encoding/binary"
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mrand "math/rand"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/trie/trienode"
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)
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// Prng is a pseudo random number generator seeded by strong randomness.
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// The randomness is printed on startup in order to make failures reproducible.
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var prng = initRand()
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func initRand() *mrand.Rand {
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var seed [8]byte
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crand.Read(seed[:])
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rnd := mrand.New(mrand.NewSource(int64(binary.LittleEndian.Uint64(seed[:]))))
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return rnd
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}
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// RandBytes generates a random byte slice with specified length.
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func RandBytes(n int) []byte {
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r := make([]byte, n)
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prng.Read(r)
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return r
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}
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// RandomHash generates a random blob of data and returns it as a hash.
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func RandomHash() common.Hash {
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return common.BytesToHash(RandBytes(common.HashLength))
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}
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// RandomAddress generates a random blob of data and returns it as an address.
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func RandomAddress() common.Address {
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return common.BytesToAddress(RandBytes(common.AddressLength))
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}
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// RandomNode generates a random node.
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func RandomNode() *trienode.Node {
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val := RandBytes(100)
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return trienode.New(crypto.Keccak256Hash(val), val)
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}
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