/
es.go
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/
es.go
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/*
Copyright ArxanFintech Technology Ltd. 2017 All Rights Reserved.
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 ecies
import (
"github.com/arxanchain/sdk-go-common/crypto/ecc/primitives"
errs "github.com/arxanchain/sdk-go-common/errors"
)
type encryptionSchemeImpl struct {
isForEncryption bool
// Parameters
params primitives.AsymmetricCipherParameters
pub *publicKeyImpl
priv *secretKeyImpl
}
func (es *encryptionSchemeImpl) Init(params primitives.AsymmetricCipherParameters) error {
if params == nil {
return primitives.ErrInvalidNilKeyParameter
}
es.isForEncryption = params.IsPublic()
es.params = params
if es.isForEncryption {
switch pk := params.(type) {
case *publicKeyImpl:
es.pub = pk
default:
return primitives.ErrInvalidPublicKeyType
}
} else {
switch sk := params.(type) {
case *secretKeyImpl:
es.priv = sk
default:
return primitives.ErrInvalidKeyParameter
}
}
return nil
}
func (es *encryptionSchemeImpl) Process(msg []byte) ([]byte, error) {
if len(msg) == 0 {
return nil, errs.ErrNilArgument
}
if es.isForEncryption {
// Encrypt
return eciesEncrypt(es.params.GetRand(), es.pub.pub, nil, nil, msg)
}
// Decrypt
return eciesDecrypt(es.priv.priv, nil, nil, msg)
}