forked from sassoftware/relic
/
key.go
142 lines (130 loc) · 3.66 KB
/
key.go
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//
// Copyright (c) SAS Institute Inc.
//
// 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 p11token
import (
"crypto"
"errors"
"io"
"github.com/miekg/pkcs11"
"github.com/sassoftware/relic/config"
"github.com/sassoftware/relic/signers/sigerrors"
"github.com/sassoftware/relic/token"
)
type Key struct {
PgpCertificate string
X509Certificate string
token *Token
keyConf *config.KeyConfig
keyType uint
pub pkcs11.ObjectHandle
priv pkcs11.ObjectHandle
pubParsed crypto.PublicKey
}
func (token *Token) GetKey(keyName string) (token.Key, error) {
token.mutex.Lock()
defer token.mutex.Unlock()
keyConf, err := token.config.GetKey(keyName)
if err != nil {
return nil, err
}
return token.getKey(keyConf, keyName)
}
func (token *Token) getKey(keyConf *config.KeyConfig, keyName string) (*Key, error) {
var err error
key := &Key{
token: token,
keyConf: keyConf,
PgpCertificate: keyConf.PgpCertificate,
X509Certificate: keyConf.X509Certificate,
}
key.priv, err = token.findKey(keyConf, pkcs11.CKO_PRIVATE_KEY)
if err != nil {
return nil, err
}
key.pub, err = token.findKey(keyConf, pkcs11.CKO_PUBLIC_KEY)
if err != nil {
return nil, err
}
keyTypeBlob := token.getAttribute(key.priv, pkcs11.CKA_KEY_TYPE)
if len(keyTypeBlob) == 0 {
return nil, errors.New("Missing CKA_KEY_TYPE on private key")
}
key.keyType = attrToInt(keyTypeBlob)
switch key.keyType {
case CKK_RSA:
key.pubParsed, err = key.toRsaKey()
case CKK_ECDSA:
key.pubParsed, err = key.toEcdsaKey()
default:
return nil, errors.New("Unsupported key type")
}
if err != nil {
return nil, err
}
return key, nil
}
func (token *Token) findKey(keyConf *config.KeyConfig, class uint) (pkcs11.ObjectHandle, error) {
attrs := []*pkcs11.Attribute{
pkcs11.NewAttribute(pkcs11.CKA_CLASS, class),
}
if keyConf.Label != "" {
attrs = append(attrs, pkcs11.NewAttribute(pkcs11.CKA_LABEL, keyConf.Label))
}
if keyConf.ID != "" {
keyID, err := parseKeyID(keyConf.ID)
if err != nil {
return 0, err
}
attrs = append(attrs, pkcs11.NewAttribute(pkcs11.CKA_ID, keyID))
}
objects, err := token.findObject(attrs)
if err != nil {
return 0, err
} else if len(objects) > 1 {
return 0, errors.New("Multiple token objects with the specified attributes")
} else if len(objects) == 0 {
return 0, sigerrors.KeyNotFoundError{}
}
return objects[0], nil
}
func (key *Key) Config() *config.KeyConfig {
return key.keyConf
}
func (key *Key) Public() crypto.PublicKey {
return key.pubParsed
}
func (key *Key) getLabel() string {
key.token.mutex.Lock()
defer key.token.mutex.Unlock()
return string(key.token.getAttribute(key.priv, pkcs11.CKA_LABEL))
}
func (key *Key) GetID() []byte {
key.token.mutex.Lock()
defer key.token.mutex.Unlock()
return key.token.getAttribute(key.priv, pkcs11.CKA_ID)
}
func (key *Key) Sign(rand io.Reader, digest []byte, opts crypto.SignerOpts) ([]byte, error) {
key.token.mutex.Lock()
defer key.token.mutex.Unlock()
switch key.keyType {
case CKK_RSA:
return key.signRSA(digest, opts)
case CKK_ECDSA:
return key.signECDSA(digest)
default:
return nil, errors.New("Unsupported key type")
}
}