Add package for Tessera integration

This change adds the workflow to instantiate the tessera storage driver
add an entry to the log. It copies most of the sigstore/rekor/pkg/signer
package to enable signing checkpoints with an on-disk key file or a KMS
provider.

The TransparencyLogEntry structure uses signed integers for the LogIndex
and TreeSize values, while tessera mostly returns unsigned integers for
these values. This change incorporates a conversion mechanism. It would
probably be better to update the protobuf-specs definition to use
unsigned integers.

Signed-off-by: Colleen Murphy <[email protected]>

go.mod

@@ -3,14 +3,137 @@ module github.com/sigstore/rekor-tiles
 go 1.24.0
 
 require (
+	github.com/sigstore/protobuf-specs v0.4.0
+	github.com/sigstore/rekor v1.3.9
+	github.com/sigstore/sigstore v1.8.15
+	github.com/sigstore/sigstore/pkg/signature/kms/aws v1.8.15
+	github.com/sigstore/sigstore/pkg/signature/kms/azure v1.8.15
+	github.com/sigstore/sigstore/pkg/signature/kms/gcp v1.8.15
+	github.com/sigstore/sigstore/pkg/signature/kms/hashivault v1.8.15
 	github.com/spf13/cobra v1.9.1
+	github.com/stretchr/testify v1.10.0
+	github.com/tink-crypto/tink-go-awskms/v2 v2.1.0
+	github.com/tink-crypto/tink-go-gcpkms/v2 v2.2.0
+	github.com/tink-crypto/tink-go/v2 v2.3.0
+	github.com/transparency-dev/formats v0.0.0-20240826204810-ad21d25a1c7f
+	github.com/transparency-dev/trillian-tessera v0.1.1-0.20250218170512-5165141dc210
+	go.step.sm/crypto v0.58.0
+	golang.org/x/exp v0.0.0-20240325151524-a685a6edb6d8
+	golang.org/x/mod v0.23.0
+	google.golang.org/protobuf v1.36.5
 	sigs.k8s.io/release-utils v0.11.0
 )
 
 require (
+	cel.dev/expr v0.19.1 // indirect
+	cloud.google.com/go v0.118.1 // indirect
+	cloud.google.com/go/auth v0.14.1 // indirect
+	cloud.google.com/go/auth/oauth2adapt v0.2.7 // indirect
+	cloud.google.com/go/compute/metadata v0.6.0 // indirect
+	cloud.google.com/go/iam v1.3.1 // indirect
+	cloud.google.com/go/kms v1.20.5 // indirect
+	cloud.google.com/go/longrunning v0.6.4 // indirect
+	cloud.google.com/go/monitoring v1.23.0 // indirect
+	cloud.google.com/go/spanner v1.75.0 // indirect
+	cloud.google.com/go/storage v1.50.0 // indirect
+	filippo.io/edwards25519 v1.1.0 // indirect
+	github.com/Azure/azure-sdk-for-go/sdk/azcore v1.17.0 // indirect
+	github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.8.2 // indirect
+	github.com/Azure/azure-sdk-for-go/sdk/internal v1.10.0 // indirect
+	github.com/Azure/azure-sdk-for-go/sdk/security/keyvault/azkeys v1.3.0 // indirect
+	github.com/Azure/azure-sdk-for-go/sdk/security/keyvault/internal v1.1.0 // indirect
+	github.com/AzureAD/microsoft-authentication-library-for-go v1.3.3 // indirect
+	github.com/GoogleCloudPlatform/grpc-gcp-go/grpcgcp v1.5.2 // indirect
+	github.com/GoogleCloudPlatform/opentelemetry-operations-go/detectors/gcp v1.25.0 // indirect
+	github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/metric v0.49.0 // indirect
+	github.com/GoogleCloudPlatform/opentelemetry-operations-go/internal/resourcemapping v0.49.0 // indirect
+	github.com/aws/aws-sdk-go v1.55.6 // indirect
+	github.com/aws/aws-sdk-go-v2 v1.36.1 // indirect
+	github.com/aws/aws-sdk-go-v2/config v1.29.6 // indirect
+	github.com/aws/aws-sdk-go-v2/credentials v1.17.59 // indirect
+	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.28 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/configsources v1.3.32 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.6.32 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/ini v1.8.2 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.12.2 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.12.13 // indirect
+	github.com/aws/aws-sdk-go-v2/service/kms v1.37.18 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sso v1.24.15 // indirect
+	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.28.14 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sts v1.33.14 // indirect
+	github.com/aws/smithy-go v1.22.2 // indirect
+	github.com/cenkalti/backoff/v4 v4.3.0 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/cncf/xds/go v0.0.0-20241223141626-cff3c89139a3 // indirect
 	github.com/common-nighthawk/go-figure v0.0.0-20210622060536-734e95fb86be // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
+	github.com/envoyproxy/go-control-plane/envoy v1.32.3 // indirect
+	github.com/envoyproxy/protoc-gen-validate v1.1.0 // indirect
+	github.com/felixge/httpsnoop v1.0.4 // indirect
+	github.com/globocom/go-buffer v1.2.2 // indirect
+	github.com/go-jose/go-jose/v3 v3.0.3 // indirect
+	github.com/go-jose/go-jose/v4 v4.0.2 // indirect
+	github.com/go-logr/logr v1.4.2 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/golang-jwt/jwt/v5 v5.2.1 // indirect
+	github.com/golang/groupcache v0.0.0-20241129210726-2c02b8208cf8 // indirect
+	github.com/google/go-cmp v0.6.0 // indirect
+	github.com/google/go-containerregistry v0.20.2 // indirect
+	github.com/google/s2a-go v0.1.9 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/googleapis/enterprise-certificate-proxy v0.3.4 // indirect
+	github.com/googleapis/gax-go/v2 v2.14.1 // indirect
+	github.com/hashicorp/errwrap v1.1.0 // indirect
+	github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
+	github.com/hashicorp/go-multierror v1.1.1 // indirect
+	github.com/hashicorp/go-retryablehttp v0.7.7 // indirect
+	github.com/hashicorp/go-rootcerts v1.0.2 // indirect
+	github.com/hashicorp/go-secure-stdlib/parseutil v0.1.7 // indirect
+	github.com/hashicorp/go-secure-stdlib/strutil v0.1.2 // indirect
+	github.com/hashicorp/go-sockaddr v1.0.2 // indirect
+	github.com/hashicorp/golang-lru/v2 v2.0.7 // indirect
+	github.com/hashicorp/hcl v1.0.0 // indirect
+	github.com/hashicorp/vault/api v1.16.0 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/jellydator/ttlcache/v3 v3.3.0 // indirect
+	github.com/jmespath/go-jmespath v0.4.1-0.20220621161143-b0104c826a24 // indirect
+	github.com/kylelemons/godebug v1.1.0 // indirect
+	github.com/letsencrypt/boulder v0.0.0-20240620165639-de9c06129bec // indirect
+	github.com/mitchellh/go-homedir v1.1.0 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/opencontainers/go-digest v1.0.0 // indirect
+	github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/planetscale/vtprotobuf v0.6.1-0.20240319094008-0393e58bdf10 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
+	github.com/ryanuber/go-glob v1.0.0 // indirect
+	github.com/secure-systems-lab/go-securesystemslib v0.9.0 // indirect
 	github.com/spf13/pflag v1.0.6 // indirect
+	github.com/titanous/rocacheck v0.0.0-20171023193734-afe73141d399 // indirect
+	github.com/transparency-dev/merkle v0.0.2 // indirect
+	go.opencensus.io v0.24.0 // indirect
+	go.opentelemetry.io/auto/sdk v1.1.0 // indirect
+	go.opentelemetry.io/contrib/detectors/gcp v1.33.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.58.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.58.0 // indirect
+	go.opentelemetry.io/otel v1.34.0 // indirect
+	go.opentelemetry.io/otel/metric v1.34.0 // indirect
+	go.opentelemetry.io/otel/sdk v1.34.0 // indirect
+	go.opentelemetry.io/otel/sdk/metric v1.33.0 // indirect
+	go.opentelemetry.io/otel/trace v1.34.0 // indirect
+	golang.org/x/crypto v0.33.0 // indirect
+	golang.org/x/net v0.35.0 // indirect
+	golang.org/x/oauth2 v0.26.0 // indirect
+	golang.org/x/sync v0.11.0 // indirect
+	golang.org/x/sys v0.30.0 // indirect
+	golang.org/x/term v0.29.0 // indirect
+	golang.org/x/text v0.22.0 // indirect
+	golang.org/x/time v0.10.0 // indirect
+	google.golang.org/api v0.221.0 // indirect
+	google.golang.org/genproto v0.0.0-20250122153221-138b5a5a4fd4 // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20250124145028-65684f501c47 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20250207221924-e9438ea467c6 // indirect
+	google.golang.org/grpc v1.70.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+	k8s.io/klog/v2 v2.130.1 // indirect
 )