added working code for keyless

Author: hackeramitkumar

a.out

@@ -11,6 +11,8 @@ import (
 
 	"github.com/google/go-containerregistry/pkg/name"
 	"github.com/google/go-containerregistry/pkg/v1/remote"
+
+	"github.com/sigstore/cosign/v2/cmd/cosign/cli/fulcio"
 	"github.com/sigstore/cosign/v2/pkg/cosign"
 	"github.com/sigstore/cosign/v2/pkg/oci"
 	"github.com/sigstore/sigstore/pkg/cryptoutils"
@@ -128,11 +130,13 @@ func keyed_signatureVerification(ctx context.Context, ref name.Reference) ([]oci
 
 func keyless_sigantureVerification(ctx context.Context, ref name.Reference) ([]oci.Signature, error) {
 
+	identity := cosign.Identity{
+		Issuer:  "https://accounts.google.com",
+		Subject: "[email protected]",
+	}
+
 	identities := []cosign.Identity{
-		cosign.Identity{
-			Issuer:  "https://accounts.google.com",
-			Subject: "[email protected]",
-		},
+		identity,
 	}
 
 	trustedTransparencyLogPubKeys, err := cosign.GetRekorPubs(ctx)
@@ -141,48 +145,61 @@ func keyless_sigantureVerification(ctx context.Context, ref name.Reference) ([]o
 	}
 	fmt.Println("Rekor keys are : ", trustedTransparencyLogPubKeys.Keys)
 
-	filePath := "demo.txt"
-	data, err := ioutil.ReadFile(filePath)
+	// filePath := "demo.txt"
+	// data, err := ioutil.ReadFile(filePath)
+	// if err != nil {
+	// 	fmt.Println("Error reading file:", err)
+	// 	panic(err)
+	// }
+
+	// // Convert the data to a byte slice ([]byte)
+	// byteData := []byte(data)
+	// cert, err := loadCert(byteData)
+	// if err != nil {
+	// 	fmt.Println(err)
+	// }
+	// fmt.Println(string(byteData))
+
+	// verifier2, err := signature.LoadVerifier(cert.PublicKey, crypto.SHA256)
+	// if err != nil {
+	// 	return nil, fmt.Errorf("failed to load signature from certificate: %w", err)
+	// }
+
+	roots, err := fulcio.GetRoots()
 	if err != nil {
-		fmt.Println("Error reading file:", err)
-		panic(err)
+		fmt.Println("Did not get roots")
 	}
 
-	// Convert the data to a byte slice ([]byte)
-	byteData := []byte(data)
-	cert, err := loadCert(byteData)
-	if err != nil {
-		fmt.Println(err)
-	}
-	fmt.Println(string(byteData))
+	// rekorUrl := "https://rekor.sigstore.dev"
 
-	verifier2, err := signature.LoadVerifier(cert.PublicKey, crypto.SHA256)
+	// rekor_client, err := rekor.NewClient(rekorUrl)
+	ctLogPubKeys, err := cosign.GetCTLogPubs(ctx)
 	if err != nil {
-		return nil, fmt.Errorf("failed to load signature from certificate: %w", err)
+		fmt.Println("Error with CTLogPubKeys")
 	}
 
-	cosignVeriOptions := cosign.CheckOpts{
+	cosignOptions := cosign.CheckOpts{
 		Identities:   identities,
 		RekorPubKeys: trustedTransparencyLogPubKeys,
-		SigVerifier:  verifier2,
+		CTLogPubKeys: ctLogPubKeys,
+		RootCerts:    roots,
 	}
 
-	fmt.Println("Started the verification")
-
-	verified_signatures, isVerified, err := cosign.VerifyImageSignatures(ctx, ref, &cosignVeriOptions)
+	verified_signatures, isVerified, err := cosign.VerifyImageSignatures(ctx, ref, &cosignOptions)
 	fmt.Println("-----------------------------Signature verification in Progress -------------------------------")
 	if err != nil {
-		fmt.Println("No signature matched : ")
+		fmt.Println("No signature matched : ", err)
+		return nil, nil
 	}
 
 	if !isVerified {
 		fmt.Println("---------------------------------Verification failed ----------------------------------------")
+		return nil, nil
 	}
 
 	fmt.Println("")
 	fmt.Println("---------------------------- Signature verification completed  ----------------------------------")
 	return verified_signatures, err
-
 }
 
 func cosign2() {

cosign

@@ -3,18 +3,67 @@ module github.com/hackeramitkumar/cosign_2.0_signature_fetching_and_verification
 go 1.20
 
 require (
+	cloud.google.com/go/compute v1.19.0 // indirect
+	cloud.google.com/go/compute/metadata v0.2.3 // indirect
+	filippo.io/edwards25519 v1.0.0 // indirect
+	github.com/AliyunContainerService/ack-ram-tool/pkg/credentials/alibabacloudsdkgo/helper v0.2.0 // indirect
+	github.com/Azure/azure-sdk-for-go v68.0.0+incompatible // indirect
+	github.com/Azure/go-autorest v14.2.0+incompatible // indirect
+	github.com/Azure/go-autorest/autorest v0.11.29 // indirect
+	github.com/Azure/go-autorest/autorest/adal v0.9.22 // indirect
+	github.com/Azure/go-autorest/autorest/azure/auth v0.5.12 // indirect
+	github.com/Azure/go-autorest/autorest/azure/cli v0.4.6 // indirect
+	github.com/Azure/go-autorest/autorest/date v0.3.0 // indirect
+	github.com/Azure/go-autorest/logger v0.2.1 // indirect
+	github.com/Azure/go-autorest/tracing v0.6.0 // indirect
 	github.com/Microsoft/go-winio v0.6.0 // indirect
+	github.com/ProtonMail/go-crypto v0.0.0-20230217124315-7d5c6f04bbb8 // indirect
+	github.com/ThalesIgnite/crypto11 v1.2.5 // indirect
+	github.com/alibabacloud-go/alibabacloud-gateway-spi v0.0.4 // indirect
+	github.com/alibabacloud-go/cr-20160607 v1.0.1 // indirect
+	github.com/alibabacloud-go/cr-20181201 v1.0.10 // indirect
+	github.com/alibabacloud-go/darabonba-openapi v0.1.18 // indirect
+	github.com/alibabacloud-go/debug v0.0.0-20190504072949-9472017b5c68 // indirect
+	github.com/alibabacloud-go/endpoint-util v1.1.1 // indirect
+	github.com/alibabacloud-go/openapi-util v0.0.11 // indirect
+	github.com/alibabacloud-go/tea v1.1.18 // indirect
+	github.com/alibabacloud-go/tea-utils v1.4.4 // indirect
+	github.com/alibabacloud-go/tea-xml v1.1.2 // indirect
+	github.com/aliyun/credentials-go v1.2.3 // indirect
 	github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2 // indirect
+	github.com/aws/aws-sdk-go-v2 v1.18.0 // indirect
+	github.com/aws/aws-sdk-go-v2/config v1.18.23 // indirect
+	github.com/aws/aws-sdk-go-v2/credentials v1.13.22 // indirect
+	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.13.3 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/configsources v1.1.33 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.4.27 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/ini v1.3.34 // indirect
+	github.com/aws/aws-sdk-go-v2/service/ecr v1.15.0 // indirect
+	github.com/aws/aws-sdk-go-v2/service/ecrpublic v1.12.0 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.9.27 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sso v1.12.10 // indirect
+	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.14.10 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sts v1.18.11 // indirect
+	github.com/aws/smithy-go v1.13.5 // indirect
+	github.com/awslabs/amazon-ecr-credential-helper/ecr-login v0.0.0-20220228164355-396b2034c795 // indirect
 	github.com/blang/semver v3.5.1+incompatible // indirect
+	github.com/chrismellard/docker-credential-acr-env v0.0.0-20220119192733-fe33c00cee21 // indirect
+	github.com/clbanning/mxj/v2 v2.5.6 // indirect
+	github.com/cloudflare/circl v1.1.0 // indirect
+	github.com/common-nighthawk/go-figure v0.0.0-20210622060536-734e95fb86be // indirect
 	github.com/containerd/stargz-snapshotter/estargz v0.14.3 // indirect
+	github.com/coreos/go-oidc/v3 v3.5.0 // indirect
 	github.com/cpuguy83/go-md2man/v2 v2.0.2 // indirect
 	github.com/cyberphone/json-canonicalization v0.0.0-20210823021906-dc406ceaf94b // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/digitorus/pkcs7 v0.0.0-20221212123742-001c36b64ec3 // indirect
 	github.com/digitorus/timestamp v0.0.0-20221019182153-ef3b63b79b31 // indirect
+	github.com/dimchansky/utfbom v1.1.1 // indirect
 	github.com/docker/cli v23.0.5+incompatible // indirect
 	github.com/docker/distribution v2.8.1+incompatible // indirect
 	github.com/docker/docker v23.0.5+incompatible // indirect
 	github.com/docker/docker-credential-helpers v0.7.0 // indirect
+	github.com/emicklei/go-restful/v3 v3.8.0 // indirect
 	github.com/fsnotify/fsnotify v1.6.0 // indirect
 	github.com/go-chi/chi v4.1.2+incompatible // indirect
 	github.com/go-jose/go-jose/v3 v3.0.0 // indirect
@@ -33,23 +82,40 @@ require (
 	github.com/go-playground/locales v0.14.1 // indirect
 	github.com/go-playground/universal-translator v0.18.1 // indirect
 	github.com/go-playground/validator/v10 v10.12.0 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang-jwt/jwt/v4 v4.5.0 // indirect
 	github.com/golang/protobuf v1.5.3 // indirect
 	github.com/golang/snappy v0.0.4 // indirect
 	github.com/google/certificate-transparency-go v1.1.4 // indirect
+	github.com/google/gnostic v0.5.7-v3refs // indirect
+	github.com/google/go-cmp v0.5.9 // indirect
 	github.com/google/go-containerregistry v0.14.1-0.20230409045903-ed5c185df419 // indirect
+	github.com/google/go-github/v50 v50.2.0 // indirect
+	github.com/google/go-querystring v1.1.0 // indirect
+	github.com/google/gofuzz v1.2.0 // indirect
 	github.com/google/trillian v1.5.1 // indirect
+	github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
+	github.com/hashicorp/go-retryablehttp v0.7.2 // indirect
 	github.com/hashicorp/hcl v1.0.0 // indirect
+	github.com/imdario/mergo v0.3.12 // indirect
 	github.com/in-toto/in-toto-golang v0.9.0 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/jedisct1/go-minisign v0.0.0-20211028175153-1c139d1cc84b // indirect
+	github.com/jmespath/go-jmespath v0.4.0 // indirect
 	github.com/josharian/intern v1.0.0 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
 	github.com/klauspost/compress v1.16.5 // indirect
 	github.com/leodido/go-urn v1.2.2 // indirect
 	github.com/letsencrypt/boulder v0.0.0-20221109233200-85aa52084eaf // indirect
 	github.com/magiconair/properties v1.8.7 // indirect
 	github.com/mailru/easyjson v0.7.7 // indirect
+	github.com/miekg/pkcs11 v1.1.1 // indirect
 	github.com/mitchellh/go-homedir v1.1.0 // indirect
 	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/mozillazg/docker-credential-acr-helper v0.3.0 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/oklog/ulid v1.3.1 // indirect
 	github.com/opencontainers/go-digest v1.0.0 // indirect
 	github.com/opencontainers/image-spec v1.1.0-rc3 // indirect
@@ -59,12 +125,15 @@ require (
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
 	github.com/sassoftware/relic v7.2.1+incompatible // indirect
 	github.com/secure-systems-lab/go-securesystemslib v0.6.0 // indirect
+	github.com/segmentio/ksuid v1.0.4 // indirect
 	github.com/shibumi/go-pathspec v1.3.0 // indirect
 	github.com/sigstore/cosign/v2 v2.0.2 // indirect
+	github.com/sigstore/fulcio v1.2.0 // indirect
 	github.com/sigstore/rekor v1.1.0 // indirect
 	github.com/sigstore/sigstore v1.6.4 // indirect
 	github.com/sigstore/timestamp-authority v1.0.0 // indirect
 	github.com/sirupsen/logrus v1.9.0 // indirect
+	github.com/skratchdot/open-golang v0.0.0-20200116055534-eef842397966 // indirect
 	github.com/spf13/afero v1.9.3 // indirect
 	github.com/spf13/cast v1.5.0 // indirect
 	github.com/spf13/cobra v1.7.0 // indirect
@@ -75,32 +144,49 @@ require (
 	github.com/subosito/gotenv v1.4.2 // indirect
 	github.com/syndtr/goleveldb v1.0.1-0.20220721030215-126854af5e6d // indirect
 	github.com/tent/canonical-json-go v0.0.0-20130607151641-96e4ba3a7613 // indirect
+	github.com/thales-e-security/pool v0.0.2 // indirect
 	github.com/theupdateframework/go-tuf v0.5.2 // indirect
 	github.com/titanous/rocacheck v0.0.0-20171023193734-afe73141d399 // indirect
+	github.com/tjfoc/gmsm v1.3.2 // indirect
 	github.com/transparency-dev/merkle v0.0.1 // indirect
 	github.com/vbatts/tar-split v0.11.3 // indirect
+	github.com/xanzy/go-gitlab v0.83.0 // indirect
 	github.com/zeebo/errs v1.3.0 // indirect
 	go.mongodb.org/mongo-driver v1.11.3 // indirect
 	go.opentelemetry.io/otel v1.14.0 // indirect
 	go.opentelemetry.io/otel/trace v1.14.0 // indirect
+	go.step.sm/crypto v0.29.3 // indirect
 	go.uber.org/atomic v1.10.0 // indirect
 	go.uber.org/multierr v1.9.0 // indirect
 	go.uber.org/zap v1.24.0 // indirect
 	golang.org/x/crypto v0.9.0 // indirect
 	golang.org/x/exp v0.0.0-20230124195608-d38c7dcee874 // indirect
 	golang.org/x/mod v0.10.0 // indirect
 	golang.org/x/net v0.10.0 // indirect
+	golang.org/x/oauth2 v0.7.0 // indirect
 	golang.org/x/sync v0.1.0 // indirect
 	golang.org/x/sys v0.8.0 // indirect
 	golang.org/x/term v0.8.0 // indirect
 	golang.org/x/text v0.9.0 // indirect
+	golang.org/x/time v0.3.0 // indirect
 	golang.org/x/tools v0.7.0 // indirect
+	google.golang.org/appengine v1.6.7 // indirect
 	google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1 // indirect
 	google.golang.org/grpc v1.55.0 // indirect
 	google.golang.org/protobuf v1.30.0 // indirect
+	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect
 	gopkg.in/square/go-jose.v2 v2.6.0 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
+	k8s.io/api v0.26.1 // indirect
+	k8s.io/apimachinery v0.26.1 // indirect
+	k8s.io/client-go v0.25.4 // indirect
 	k8s.io/klog/v2 v2.90.0 // indirect
+	k8s.io/kube-openapi v0.0.0-20221012153701-172d655c2280 // indirect
+	k8s.io/utils v0.0.0-20230115233650-391b47cb4029 // indirect
+	sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd // indirect
+	sigs.k8s.io/release-utils v0.7.3 // indirect
+	sigs.k8s.io/structured-merge-diff/v4 v4.2.3 // indirect
+	sigs.k8s.io/yaml v1.3.0 // indirect
 )