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signer.go
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signer.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package signer
import (
"crypto"
"crypto/ecdsa"
"crypto/rand"
"crypto/x509"
"encoding/asn1"
"encoding/pem"
"io/ioutil"
"math/big"
"github.com/hyperledger/fabric-protos-go/msp"
"github.com/hyperledger/fabric/bccsp/utils"
"github.com/hyperledger/fabric/common/util"
"github.com/hyperledger/fabric/protoutil"
"github.com/pkg/errors"
)
// Config holds the configuration for
// creation of a Signer
type Config struct {
MSPID string
IdentityPath string
KeyPath string
}
// Signer signs messages.
// TODO: Ideally we'd use an MSP to be agnostic, but since it's impossible to
// initialize an MSP without a CA cert that signs the signing identity,
// this will do for now.
type Signer struct {
key *ecdsa.PrivateKey
Creator []byte
}
func (si *Signer) Serialize() ([]byte, error) {
return si.Creator, nil
}
// NewSigner creates a new Signer out of the given configuration
func NewSigner(conf Config) (*Signer, error) {
sId, err := serializeIdentity(conf.IdentityPath, conf.MSPID)
if err != nil {
return nil, errors.WithStack(err)
}
key, err := loadPrivateKey(conf.KeyPath)
if err != nil {
return nil, errors.WithStack(err)
}
return &Signer{
Creator: sId,
key: key,
}, nil
}
func serializeIdentity(clientCert string, mspID string) ([]byte, error) {
b, err := ioutil.ReadFile(clientCert)
if err != nil {
return nil, errors.WithStack(err)
}
sId := &msp.SerializedIdentity{
Mspid: mspID,
IdBytes: b,
}
return protoutil.MarshalOrPanic(sId), nil
}
func (si *Signer) Sign(msg []byte) ([]byte, error) {
digest := util.ComputeSHA256(msg)
return signECDSA(si.key, digest)
}
func loadPrivateKey(file string) (*ecdsa.PrivateKey, error) {
b, err := ioutil.ReadFile(file)
if err != nil {
return nil, errors.WithStack(err)
}
bl, _ := pem.Decode(b)
if bl == nil {
return nil, errors.Errorf("failed to decode PEM block from %s", file)
}
key, err := parsePrivateKey(bl.Bytes)
if err != nil {
return nil, err
}
return key.(*ecdsa.PrivateKey), nil
}
// Based on crypto/tls/tls.go but modified for Fabric:
func parsePrivateKey(der []byte) (crypto.PrivateKey, error) {
// OpenSSL 1.0.0 generates PKCS#8 keys.
if key, err := x509.ParsePKCS8PrivateKey(der); err == nil {
switch key := key.(type) {
// Fabric only supports ECDSA at the moment.
case *ecdsa.PrivateKey:
return key, nil
default:
return nil, errors.Errorf("found unknown private key type (%T) in PKCS#8 wrapping", key)
}
}
// OpenSSL ecparam generates SEC1 EC private keys for ECDSA.
key, err := x509.ParseECPrivateKey(der)
if err != nil {
return nil, errors.Errorf("failed to parse private key: %v", err)
}
return key, nil
}
func signECDSA(k *ecdsa.PrivateKey, digest []byte) (signature []byte, err error) {
r, s, err := ecdsa.Sign(rand.Reader, k, digest)
if err != nil {
return nil, err
}
s, _, err = utils.ToLowS(&k.PublicKey, s)
if err != nil {
return nil, err
}
return marshalECDSASignature(r, s)
}
func marshalECDSASignature(r, s *big.Int) ([]byte, error) {
return asn1.Marshal(ECDSASignature{r, s})
}
type ECDSASignature struct {
R, S *big.Int
}