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signerverifier_options.go
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/
signerverifier_options.go
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//
// Copyright 2024 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 signature
import (
"crypto"
"crypto/rsa"
)
type loadOpts struct {
hashFunc crypto.Hash
useED25519ph bool
rsaPSSOptions *rsa.PSSOptions
}
// LoadOption specifies options to be used when creating a Signer/Verifier
type LoadOption func(*loadOpts)
// WithHash specifies the hash function to be used for the Signer/Verifier
func WithHash(hashFunc crypto.Hash) LoadOption {
return func(o *loadOpts) {
o.hashFunc = hashFunc
}
}
// WithED25519ph specifies that the ED25519ph algorithm should be used when a ED25519 key is used
func WithED25519ph() LoadOption {
return func(o *loadOpts) {
o.useED25519ph = true
}
}
// WithRSAPSS specifies that the RSAPSS algorithm should be used when a RSA key is used
// Note that the RSA PSSOptions contains an hash algorithm, which will override
// the hash function specified with WithHash.
func WithRSAPSS(opts *rsa.PSSOptions) LoadOption {
return func(o *loadOpts) {
o.rsaPSSOptions = opts
}
}
// GetSignerVerifierOptionHash returns the hash function specified in the options
func GetSignerVerifierOptionHash(opts ...LoadOption) crypto.Hash {
o := makeSignerVerifierOpts(opts...)
return o.hashFunc
}
func makeSignerVerifierOpts(opts ...LoadOption) *loadOpts {
o := &loadOpts{
hashFunc: crypto.SHA256,
}
for _, opt := range opts {
opt(o)
}
return o
}