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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 signer
import (
"context"
"crypto"
"crypto/elliptic"
"crypto/rand"
"fmt"
"strings"
"github.com/sigstore/sigstore/pkg/signature"
"github.com/sigstore/sigstore/pkg/signature/kms"
// Register the provider-specific plugins
_ "github.com/sigstore/sigstore/pkg/signature/kms/aws"
_ "github.com/sigstore/sigstore/pkg/signature/kms/azure"
_ "github.com/sigstore/sigstore/pkg/signature/kms/gcp"
_ "github.com/sigstore/sigstore/pkg/signature/kms/hashivault"
)
const KMSScheme = "kms"
const TinkScheme = "tink"
const MemoryScheme = "memory"
const FileScheme = "file"
func NewCryptoSigner(ctx context.Context, hash crypto.Hash, signer, kmsKey, tinkKmsKey, tinkKeysetPath, hcVaultToken, fileSignerPath, fileSignerPasswd string) (crypto.Signer, error) {
switch signer {
case MemoryScheme:
sv, _, err := signature.NewECDSASignerVerifier(elliptic.P256(), rand.Reader, crypto.SHA256)
return sv, err
case FileScheme:
return NewFileSigner(fileSignerPath, fileSignerPasswd, hash)
case KMSScheme:
signer, err := kms.Get(ctx, kmsKey, hash) // hash is ignored for all KMS providers except Hashivault
if err != nil {
return nil, err
}
s, _, err := signer.CryptoSigner(ctx, func(_ error) {})
return s, err
case TinkScheme:
primaryKey, err := GetPrimaryKey(ctx, tinkKmsKey, hcVaultToken)
if err != nil {
return nil, err
}
return NewTinkSigner(ctx, tinkKeysetPath, primaryKey)
default:
return nil, fmt.Errorf("unsupported signer type: %s", signer)
}
}
func HashToAlg(signerHashAlg string) (crypto.Hash, error) {
lowercaseAlg := strings.ToLower(signerHashAlg)
var hash crypto.Hash
switch lowercaseAlg {
case "sha256":
hash = crypto.SHA256
case "sha384":
hash = crypto.SHA384
case "sha512":
hash = crypto.SHA512
default:
return crypto.Hash(0), fmt.Errorf("unsupported hash algorithm: %s", lowercaseAlg)
}
return hash, nil
}
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