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//
// Copyright 2022 The Sigstore Authors.
//
// 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 dsse
import (
"bytes"
"crypto"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"encoding/base64"
"encoding/json"
"strings"
"testing"
"unicode/utf8"
"github.com/secure-systems-lab/go-securesystemslib/dsse"
"github.com/sigstore/sigstore/pkg/signature"
ds "github.com/sigstore/sigstore/pkg/signature/dsse"
)
func FuzzDSSE(f *testing.F) {
f.Fuzz(func(t *testing.T, data, payload string) {
if !utf8.Valid([]byte(data)) {
t.Skip("invalid utf8")
}
if !utf8.Valid([]byte(payload)) {
t.Skip("invalid utf8")
}
p, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
if err != nil {
t.Errorf("failed to generate key: %v", err)
}
sv, err := signature.LoadECDSASignerVerifier(p, crypto.SHA256)
if err != nil {
t.Errorf("failed to load signer verifier: %v", err)
}
wsv := ds.WrapSignerVerifier(sv, payload)
sig, err := wsv.SignMessage(strings.NewReader(data))
if err != nil {
t.Errorf("failed to sign message: %v", err)
}
if err := wsv.VerifySignature(bytes.NewReader(sig), nil); err != nil {
t.Errorf("failed to verify signature: %v", err)
}
env := dsse.Envelope{}
if err := json.Unmarshal(sig, &env); err != nil {
panic(err)
}
if env.PayloadType != payload {
t.Errorf("Expected payloadType %s, got %s", payload, env.PayloadType)
}
got, err := base64.StdEncoding.DecodeString(env.Payload)
if err != nil {
t.Errorf("failed to decode payload: %v", err)
}
if string(got) != data {
t.Errorf("Expected payload %s, got %s", data, env.Payload)
}
})
}
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