github.com/lzy4123/fabric@v2.1.1+incompatible/bccsp/sw/ecdsakey.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/ecdsa"
    20  	"crypto/elliptic"
    21  	"crypto/sha256"
    22  	"crypto/x509"
    23  	"errors"
    24  	"fmt"
    25  
    26  	"github.com/hyperledger/fabric/bccsp"
    27  )
    28  
    29  type ecdsaPrivateKey struct {
    30  	privKey *ecdsa.PrivateKey
    31  }
    32  
    33  // Bytes converts this key to its byte representation,
    34  // if this operation is allowed.
    35  func (k *ecdsaPrivateKey) Bytes() ([]byte, error) {
    36  	return nil, errors.New("Not supported.")
    37  }
    38  
    39  // SKI returns the subject key identifier of this key.
    40  func (k *ecdsaPrivateKey) SKI() []byte {
    41  	if k.privKey == nil {
    42  		return nil
    43  	}
    44  
    45  	// Marshall the public key
    46  	raw := elliptic.Marshal(k.privKey.Curve, k.privKey.PublicKey.X, k.privKey.PublicKey.Y)
    47  
    48  	// Hash it
    49  	hash := sha256.New()
    50  	hash.Write(raw)
    51  	return hash.Sum(nil)
    52  }
    53  
    54  // Symmetric returns true if this key is a symmetric key,
    55  // false if this key is asymmetric
    56  func (k *ecdsaPrivateKey) Symmetric() bool {
    57  	return false
    58  }
    59  
    60  // Private returns true if this key is a private key,
    61  // false otherwise.
    62  func (k *ecdsaPrivateKey) Private() bool {
    63  	return true
    64  }
    65  
    66  // PublicKey returns the corresponding public key part of an asymmetric public/private key pair.
    67  // This method returns an error in symmetric key schemes.
    68  func (k *ecdsaPrivateKey) PublicKey() (bccsp.Key, error) {
    69  	return &ecdsaPublicKey{&k.privKey.PublicKey}, nil
    70  }
    71  
    72  type ecdsaPublicKey struct {
    73  	pubKey *ecdsa.PublicKey
    74  }
    75  
    76  // Bytes converts this key to its byte representation,
    77  // if this operation is allowed.
    78  func (k *ecdsaPublicKey) Bytes() (raw []byte, err error) {
    79  	raw, err = x509.MarshalPKIXPublicKey(k.pubKey)
    80  	if err != nil {
    81  		return nil, fmt.Errorf("Failed marshalling key [%s]", err)
    82  	}
    83  	return
    84  }
    85  
    86  // SKI returns the subject key identifier of this key.
    87  func (k *ecdsaPublicKey) SKI() []byte {
    88  	if k.pubKey == nil {
    89  		return nil
    90  	}
    91  
    92  	// Marshall the public key
    93  	raw := elliptic.Marshal(k.pubKey.Curve, k.pubKey.X, k.pubKey.Y)
    94  
    95  	// Hash it
    96  	hash := sha256.New()
    97  	hash.Write(raw)
    98  	return hash.Sum(nil)
    99  }
   100  
   101  // Symmetric returns true if this key is a symmetric key,
   102  // false if this key is asymmetric
   103  func (k *ecdsaPublicKey) Symmetric() bool {
   104  	return false
   105  }
   106  
   107  // Private returns true if this key is a private key,
   108  // false otherwise.
   109  func (k *ecdsaPublicKey) Private() bool {
   110  	return false
   111  }
   112  
   113  // PublicKey returns the corresponding public key part of an asymmetric public/private key pair.
   114  // This method returns an error in symmetric key schemes.
   115  func (k *ecdsaPublicKey) PublicKey() (bccsp.Key, error) {
   116  	return k, nil
   117  }