145 lines
4.1 KiB
Go
145 lines
4.1 KiB
Go
/*-
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* Copyright 2018 Square Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package jose
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// OpaqueSigner is an interface that supports signing payloads with opaque
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// private key(s). Private key operations preformed by implementors may, for
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// example, occur in a hardware module. An OpaqueSigner may rotate signing keys
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// transparently to the user of this interface.
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type OpaqueSigner interface {
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// Public returns the public key of the current signing key.
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Public() *JSONWebKey
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// Algs returns a list of supported signing algorithms.
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Algs() []SignatureAlgorithm
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// SignPayload signs a payload with the current signing key using the given
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// algorithm.
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SignPayload(payload []byte, alg SignatureAlgorithm) ([]byte, error)
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}
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type opaqueSigner struct {
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signer OpaqueSigner
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}
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func newOpaqueSigner(alg SignatureAlgorithm, signer OpaqueSigner) (recipientSigInfo, error) {
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var algSupported bool
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for _, salg := range signer.Algs() {
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if alg == salg {
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algSupported = true
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break
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}
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}
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if !algSupported {
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return recipientSigInfo{}, ErrUnsupportedAlgorithm
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}
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return recipientSigInfo{
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sigAlg: alg,
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publicKey: signer.Public,
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signer: &opaqueSigner{
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signer: signer,
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},
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}, nil
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}
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func (o *opaqueSigner) signPayload(payload []byte, alg SignatureAlgorithm) (Signature, error) {
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out, err := o.signer.SignPayload(payload, alg)
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if err != nil {
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return Signature{}, err
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}
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return Signature{
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Signature: out,
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protected: &rawHeader{},
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}, nil
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}
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// OpaqueVerifier is an interface that supports verifying payloads with opaque
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// public key(s). An OpaqueSigner may rotate signing keys transparently to the
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// user of this interface.
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type OpaqueVerifier interface {
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VerifyPayload(payload []byte, signature []byte, alg SignatureAlgorithm) error
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}
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type opaqueVerifier struct {
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verifier OpaqueVerifier
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}
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func (o *opaqueVerifier) verifyPayload(payload []byte, signature []byte, alg SignatureAlgorithm) error {
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return o.verifier.VerifyPayload(payload, signature, alg)
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}
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// OpaqueKeyEncrypter is an interface that supports encrypting keys with an opaque key.
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type OpaqueKeyEncrypter interface {
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// KeyID returns the kid
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KeyID() string
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// Algs returns a list of supported key encryption algorithms.
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Algs() []KeyAlgorithm
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// encryptKey encrypts the CEK using the given algorithm.
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encryptKey(cek []byte, alg KeyAlgorithm) (recipientInfo, error)
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}
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type opaqueKeyEncrypter struct {
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encrypter OpaqueKeyEncrypter
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}
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func newOpaqueKeyEncrypter(alg KeyAlgorithm, encrypter OpaqueKeyEncrypter) (recipientKeyInfo, error) {
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var algSupported bool
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for _, salg := range encrypter.Algs() {
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if alg == salg {
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algSupported = true
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break
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}
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}
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if !algSupported {
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return recipientKeyInfo{}, ErrUnsupportedAlgorithm
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}
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return recipientKeyInfo{
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keyID: encrypter.KeyID(),
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keyAlg: alg,
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keyEncrypter: &opaqueKeyEncrypter{
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encrypter: encrypter,
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},
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}, nil
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}
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func (oke *opaqueKeyEncrypter) encryptKey(cek []byte, alg KeyAlgorithm) (recipientInfo, error) {
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return oke.encrypter.encryptKey(cek, alg)
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}
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//OpaqueKeyDecrypter is an interface that supports decrypting keys with an opaque key.
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type OpaqueKeyDecrypter interface {
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DecryptKey(encryptedKey []byte, header Header) ([]byte, error)
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}
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type opaqueKeyDecrypter struct {
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decrypter OpaqueKeyDecrypter
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}
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func (okd *opaqueKeyDecrypter) decryptKey(headers rawHeader, recipient *recipientInfo, generator keyGenerator) ([]byte, error) {
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mergedHeaders := rawHeader{}
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mergedHeaders.merge(&headers)
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mergedHeaders.merge(recipient.header)
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header, err := mergedHeaders.sanitized()
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if err != nil {
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return nil, err
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}
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return okd.decrypter.DecryptKey(recipient.encryptedKey, header)
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}
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