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random.go
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random.go
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// Copyright 2017-2018 Stratumn SAS. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package chainscripttest
import (
"math/rand"
"testing"
"github.com/stratumn/go-chainscript"
"github.com/stratumn/go-crypto/keys"
"github.com/stretchr/testify/require"
)
var letters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
// RandomBytes returns a random byte array of the specified length.
func RandomBytes(n int) []byte {
b := make([]byte, n)
rand.Read(b)
return b
}
// RandomHash creates a random hash.
func RandomHash() chainscript.LinkHash {
return RandomBytes(32)
}
// RandomString generates a random string.
func RandomString(n int) string {
b := make([]rune, n)
for i := range b {
b[i] = letters[rand.Intn(len(letters))]
}
return string(b)
}
// RandomPrivateKey generates a private key that can be used to sign links.
func RandomPrivateKey(t *testing.T) []byte {
_, privKey, err := keys.NewEd25519KeyPair()
require.NoError(t, err)
keyBytes, err := keys.EncodeED25519SecretKey(privKey)
require.NoError(t, err)
return keyBytes
}
// RandomLink creates a link with random data.
func RandomLink(t *testing.T) *chainscript.Link {
return NewLinkBuilder(t).WithRandomData().Build()
}
// RandomSegment creates a segment with random data.
func RandomSegment(t *testing.T) *chainscript.Segment {
return NewLinkBuilder(t).WithRandomData().Segmentify(t)
}
// RandomEvidence creates a random evidence.
func RandomEvidence(t *testing.T) *chainscript.Evidence {
return &chainscript.Evidence{
Version: "1.0.0",
Backend: RandomString(6),
Provider: RandomString(10),
Proof: RandomBytes(64),
}
}