github.com/lzy4123/fabric@v2.1.1+incompatible/bccsp/sw/aeskey.go (about)

     1  /*
     2  Copyright IBM Corp. 2016 All Rights Reserved.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8  		 http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  package sw
    17  
    18  import (
    19  	"crypto/sha256"
    20  	"errors"
    21  
    22  	"github.com/hyperledger/fabric/bccsp"
    23  )
    24  
    25  type aesPrivateKey struct {
    26  	privKey    []byte
    27  	exportable bool
    28  }
    29  
    30  // Bytes converts this key to its byte representation,
    31  // if this operation is allowed.
    32  func (k *aesPrivateKey) Bytes() (raw []byte, err error) {
    33  	if k.exportable {
    34  		return k.privKey, nil
    35  	}
    36  
    37  	return nil, errors.New("Not supported.")
    38  }
    39  
    40  // SKI returns the subject key identifier of this key.
    41  func (k *aesPrivateKey) SKI() (ski []byte) {
    42  	hash := sha256.New()
    43  	hash.Write([]byte{0x01})
    44  	hash.Write(k.privKey)
    45  	return hash.Sum(nil)
    46  }
    47  
    48  // Symmetric returns true if this key is a symmetric key,
    49  // false if this key is asymmetric
    50  func (k *aesPrivateKey) Symmetric() bool {
    51  	return true
    52  }
    53  
    54  // Private returns true if this key is a private key,
    55  // false otherwise.
    56  func (k *aesPrivateKey) Private() bool {
    57  	return true
    58  }
    59  
    60  // PublicKey returns the corresponding public key part of an asymmetric public/private key pair.
    61  // This method returns an error in symmetric key schemes.
    62  func (k *aesPrivateKey) PublicKey() (bccsp.Key, error) {
    63  	return nil, errors.New("Cannot call this method on a symmetric key.")
    64  }