Merge pull request #20 from docker/small-tidies

Small tidies

internal/util/crypto.go

@@ -5,14 +5,11 @@ import (
 	"encoding/hex"
 )
 
-func HexHashBytes(input []byte) string {
-	s256 := sha256.New()
-	s256.Write(input)
-	hashSum := s256.Sum(nil)
-	return hex.EncodeToString(hashSum)
+func SHA256Hex(input []byte) string {
+	return hex.EncodeToString(SHA256(input))
 }
 
-func S256(data []byte) []byte {
+func SHA256(data []byte) []byte {
 	h := sha256.Sum256(data)
 	return h[:]
 }

internal/util/strings.go

@@ -1,10 +0,0 @@
-package util
-
-func StringInSlice(str string, list []string) bool {
-	for _, v := range list {
-		if v == str {
-			return true
-		}
-	}
-	return false
-}

pkg/attest/example_verify_test.go

@@ -2,6 +2,7 @@ package attest_test
 
 import (
 	"context"
+	"fmt"
 	"os"
 	"path/filepath"
 
@@ -63,9 +64,9 @@ func ExampleVerify_remote() {
 		panic(err) // failed policy or attestation signature verification
 	}
 	if policy {
-		print("policy passed: %v\n", policy)
+		fmt.Printf("policy passed: %v\n", policy)
 		return // passed policy
 	}
 	// no policy found for image
-	print("no policy for image")
+	fmt.Printf("no policy for image")
 }

pkg/attestation/attestation.go

@@ -3,6 +3,7 @@ package attestation
 import (
 	"encoding/json"
 	"fmt"
+	"maps"
 
 	v1 "github.com/google/go-containerregistry/pkg/v1"
 	"github.com/google/go-containerregistry/pkg/v1/partial"
@@ -64,10 +65,7 @@ func GetAttestationsFromImage(image v1.Image) ([]AttestationLayer, error) {
 			return nil, fmt.Errorf("failed to get descriptor for layer: %w", err)
 		}
 		// copy original annotations
-		ann := make(map[string]string)
-		for k, v := range layerDesc.Annotations {
-			ann[k] = v
-		}
+		ann := maps.Clone(layerDesc.Annotations)
 		// only decode intoto statements
 		var stmt = new(intoto.Statement)
 		if mt == types.MediaType(intoto.PayloadType) {

pkg/attestation/sign.go

@@ -19,7 +19,7 @@ func SignDSSE(ctx context.Context, payload []byte, payloadType string, signer ds
 	encPayload := dsse.PAE(payloadType, payload)
 
 	// statement message digest
-	hash := util.S256(encPayload)
+	hash := util.SHA256(encPayload)
 
 	// sign message digest
 	sig, err := signer.Sign(ctx, hash)

pkg/attestation/verify.go

@@ -121,7 +121,7 @@ func verifySignature(ctx context.Context, sig Signature, payload []byte, keys Ke
 		return fmt.Errorf("error failed to decode signature: %w", err)
 	}
 	// verify payload ecdsa signature
-	ok = ecdsa.VerifyASN1(publicKey, util.S256(payload), signature)
+	ok = ecdsa.VerifyASN1(publicKey, util.SHA256(payload), signature)
 	if !ok {
 		return fmt.Errorf("payload signature is not valid")
 	}

pkg/mirror/metadata_test.go

@@ -21,10 +21,10 @@ func TestGetTufMetadataMirror(t *testing.T) {
 
 	path := test.CreateTempDir(t, "", "tuf_temp")
 	m, err := NewTufMirror(embed.DevRoot, path, server.URL+"/metadata", server.URL+"/targets")
-	assert.Nil(t, err)
+	assert.NoError(t, err)
 
 	tufMetadata, err := m.getTufMetadataMirror(server.URL + "/metadata")
-	assert.Nil(t, err)
+	assert.NoError(t, err)
 
 	// check that all roles are not empty
 	assert.Greater(t, len(tufMetadata.Root), 0)
@@ -39,15 +39,15 @@ func TestGetMetadataManifest(t *testing.T) {
 
 	path := test.CreateTempDir(t, "", "tuf_temp")
 	m, err := NewTufMirror(embed.DevRoot, path, server.URL+"/metadata", server.URL+"/targets")
-	assert.Nil(t, err)
+	assert.NoError(t, err)
 
 	img, err := m.GetMetadataManifest(server.URL + "/metadata")
-	assert.Nil(t, err)
+	assert.NoError(t, err)
 	assert.NotNil(t, img)
 
 	image := *img
 	mf, err := image.RawManifest()
-	assert.Nil(t, err)
+	assert.NoError(t, err)
 
 	type Annotations struct {
 		Annotations map[string]string `json:"annotations"`
@@ -57,7 +57,7 @@ func TestGetMetadataManifest(t *testing.T) {
 	}
 	l := &Layers{}
 	err = json.Unmarshal(mf, l)
-	assert.Nil(t, err)
+	assert.NoError(t, err)
 
 	// check that layers are annotated and use consistent snapshot naming
 	for _, layer := range l.Layers {
@@ -69,7 +69,7 @@ func TestGetMetadataManifest(t *testing.T) {
 			continue
 		}
 		_, err := strconv.Atoi(parts[0])
-		assert.Nil(t, err)
+		assert.NoError(t, err)
 	}
 }
 
@@ -79,10 +79,10 @@ func TestGetDelegatedMetadataMirrors(t *testing.T) {
 
 	path := test.CreateTempDir(t, "", "tuf_temp")
 	m, err := NewTufMirror(embed.DevRoot, path, server.URL+"/metadata", server.URL+"/targets")
-	assert.Nil(t, err)
+	assert.NoError(t, err)
 
 	delegations, err := m.GetDelegatedMetadataMirrors()
-	assert.Nil(t, err)
+	assert.NoError(t, err)
 
 	assert.NotNil(t, delegations)
 	assert.Greater(t, len(delegations), 0)

pkg/mirror/targets.go

@@ -35,7 +35,7 @@ func (m *TufMirror) GetTufTargetMirrors() ([]*MirrorImage, error) {
 		if !ok {
 			return nil, fmt.Errorf("missing sha256 hash for target %s", t.Path)
 		}
-		name := strings.Join([]string{hash.String(), t.Path}, ".")
+		name := hash.String() + "." + t.Path
 		ann := map[string]string{tufFileAnnotation: name}
 		layer := mutate.Addendum{Layer: static.NewLayer(data, tufTargetMediaType), Annotations: ann}
 		img, err = mutate.Append(img, layer)
@@ -86,7 +86,7 @@ func (m *TufMirror) GetDelegatedTargetMirrors() ([]*MirrorIndex, error) {
 			if !ok {
 				return nil, fmt.Errorf("failed to find target subdirectory [%s] in path: %s", subdir, target.Path)
 			}
-			name := strings.Join([]string{hash.String(), filename}, ".")
+			name := hash.String() + "." + filename
 			ann := map[string]string{tufFileAnnotation: name}
 			layer := mutate.Addendum{Layer: static.NewLayer(data, tufTargetMediaType), Annotations: ann}
 			img, err = mutate.Append(img, layer)

pkg/mirror/targets_test.go

@@ -27,22 +27,22 @@ func TestGetTufTargetsMirror(t *testing.T) {
 
 	path := test.CreateTempDir(t, "", "tuf_temp")
 	m, err := NewTufMirror(embed.DevRoot, path, server.URL+"/metadata", server.URL+"/targets")
-	assert.Nil(t, err)
+	assert.NoError(t, err)
 
 	targets, err := m.GetTufTargetMirrors()
-	assert.Nil(t, err)
+	assert.NoError(t, err)
 	assert.Greater(t, len(targets), 0)
 
 	// check for image layer annotations
 	for _, target := range targets {
 		img := *target.Image
 		mf, err := img.RawManifest()
-		assert.Nil(t, err)
+		assert.NoError(t, err)
 
 		// unmarshal manifest with annotations
 		l := &Layers{}
 		err = json.Unmarshal(mf, l)
-		assert.Nil(t, err)
+		assert.NoError(t, err)
 
 		// check that layers are annotated
 		for _, layer := range l.Layers {
@@ -61,10 +61,10 @@ func TestTargetDelegationMetadata(t *testing.T) {
 
 	path := test.CreateTempDir(t, "", "tuf_temp")
 	tm, err := NewTufMirror(embed.DevRoot, path, server.URL+"/metadata", server.URL+"/targets")
-	assert.Nil(t, err)
+	assert.NoError(t, err)
 
 	targets, err := tm.TufClient.LoadDelegatedTargets("test-role", "targets")
-	assert.Nil(t, err)
+	assert.NoError(t, err)
 	assert.Greater(t, len(targets.Signed.Targets), 0)
 }
 
@@ -74,22 +74,22 @@ func TestGetDelegatedTargetMirrors(t *testing.T) {
 
 	path := test.CreateTempDir(t, "", "tuf_temp")
 	m, err := NewTufMirror(embed.DevRoot, path, server.URL+"/metadata", server.URL+"/targets")
-	assert.Nil(t, err)
+	assert.NoError(t, err)
 
 	mirrors, err := m.GetDelegatedTargetMirrors()
-	assert.Nil(t, err)
+	assert.NoError(t, err)
 	assert.Greater(t, len(mirrors), 0)
 
 	// check for index image annotations
 	for _, mirror := range mirrors {
 		idx := *mirror.Index
 		mf, err := idx.RawManifest()
-		assert.Nil(t, err)
+		assert.NoError(t, err)
 
 		// unmarshal manifest with annotations
 		l := &Layers{}
 		err = json.Unmarshal(mf, l)
-		assert.Nil(t, err)
+		assert.NoError(t, err)
 
 		// check that layers are annotated
 		for _, layer := range l.Layers {

pkg/policy/policy.go

@@ -6,10 +6,10 @@ import (
 	"os"
 	"path"
 	"path/filepath"
+	"slices"
 	"strings"
 
 	"github.com/distribution/reference"
-	"github.com/docker/attest/internal/util"
 	"github.com/docker/attest/pkg/oci"
 	"github.com/docker/attest/pkg/tuf"
 
@@ -148,7 +148,7 @@ func findPolicyMatch(named reference.Named, mappings *PolicyMappings) (*PolicyMa
 		}
 		// now search mirrors
 		for _, mirror := range mappings.Mirrors {
-			if util.StringInSlice(reference.Domain(named), mirror.Mirror.Domains) &&
+			if slices.Contains(mirror.Mirror.Domains, reference.Domain(named)) &&
 				strings.HasPrefix(reference.Path(named), mirror.Mirror.Prefix) {
 				for _, mapping := range mappings.Policies {
 					if mapping.Name == mirror.Name {

pkg/signerverifier/common.go

@@ -38,7 +38,7 @@ func (s *ECDSA256_SignerVerifier) Verify(ctx context.Context, data []byte, sig [
 	if !ok {
 		return fmt.Errorf("public key is not ecdsa")
 	}
-	ok = ecdsa.VerifyASN1(pub, util.S256(data), sig)
+	ok = ecdsa.VerifyASN1(pub, util.SHA256(data), sig)
 	if !ok {
 		return fmt.Errorf("payload signature is not valid")
 	}

pkg/signerverifier/keyid.go

@@ -13,5 +13,5 @@ func KeyID(pubKey crypto.PublicKey) (string, error) {
 	if err != nil {
 		return "", fmt.Errorf("error marshalling public key: %w", err)
 	}
-	return util.HexHashBytes(pub), nil
+	return util.SHA256Hex(pub), nil
 }

pkg/tlog/tl.go

@@ -7,7 +7,6 @@ import (
 	"crypto/x509"
 	"crypto/x509/pkix"
 	"encoding/base64"
-	"encoding/hex"
 	"encoding/pem"
 	"fmt"
 	"math/big"
@@ -214,7 +213,7 @@ func (tl *RekorTL) VerifyEntryPayload(entryBytes, payload, publicKey []byte) err
 	}
 
 	// compare payload hashes
-	payloadHash := hex.EncodeToString(util.S256(payload))
+	payloadHash := util.SHA256Hex(payload)
 	if rekord.Hash != payloadHash {
 		return fmt.Errorf("error payload and tl entry hash mismatch")
 	}

pkg/tlog/tl_test.go

@@ -44,7 +44,7 @@ func TestCreateX509Cert(t *testing.T) {
 func TestUploadAndVerifyLogEntry(t *testing.T) {
 	// message digest
 	payload := []byte("test")
-	hash := util.S256(payload)
+	hash := util.SHA256(payload)
 
 	// generate ephemeral keys to sign message digest
 	signer, err := signerverifier.GenKeyPair()

pkg/tuf/registry_test.go

@@ -121,7 +121,7 @@ func TestFindFileInManifest(t *testing.T) {
 	// make test image manifest
 	file := "test.json"
 	data := []byte("test")
-	hash := v1.Hash{Algorithm: "sha256", Hex: util.HexHashBytes(data)}
+	hash := v1.Hash{Algorithm: "sha256", Hex: util.SHA256Hex(data)}
 	img := empty.Image
 	img = mutate.MediaType(img, types.OCIManifestSchema1)
 	img = mutate.ConfigMediaType(img, types.OCIConfigJSON)

pkg/tuf/tuf.go

@@ -44,7 +44,7 @@ func NewTufClient(initialRoot []byte, tufPath, metadataSource, targetsSource str
 		tufSource = OciSource
 	}
 
-	tufRootDigest := util.HexHashBytes(initialRoot)
+	tufRootDigest := util.SHA256Hex(initialRoot)
 
 	// create a directory for each initial root.json
 	metadataPath := filepath.Join(tufPath, tufRootDigest)