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crypto.go
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crypto.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package comm
import (
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/tls"
"crypto/x509"
"encoding/pem"
"fmt"
"math/big"
"os"
"errors"
"github.com/hyperledger/fabric/common/util"
gutil "github.com/hyperledger/fabric/gossip/util"
"golang.org/x/net/context"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/peer"
)
func writeFile(filename string, keyType string, data []byte) error {
f, err := os.Create(filename)
if err != nil {
return err
}
defer f.Close()
return pem.Encode(f, &pem.Block{Type: keyType, Bytes: data})
}
func GenerateCertificatesOrPanic() tls.Certificate {
privKeyFile := fmt.Sprintf("key.%d.priv", gutil.RandomUInt64())
certKeyFile := fmt.Sprintf("cert.%d.pub", gutil.RandomUInt64())
defer os.Remove(privKeyFile)
defer os.Remove(certKeyFile)
privateKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
if err != nil {
panic(err)
}
sn, err := rand.Int(rand.Reader, new(big.Int).Lsh(big.NewInt(1), 128))
if err != nil {
panic(err)
}
template := x509.Certificate{
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
SerialNumber: sn,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
}
rawBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &privateKey.PublicKey, privateKey)
if err != nil {
panic(err)
}
err = writeFile(certKeyFile, "CERTIFICATE", rawBytes)
if err != nil {
panic(err)
}
privBytes, err := x509.MarshalECPrivateKey(privateKey)
if err != nil {
panic(err)
}
err = writeFile(privKeyFile, "EC PRIVATE KEY", privBytes)
if err != nil {
panic(err)
}
cert, err := tls.LoadX509KeyPair(certKeyFile, privKeyFile)
if err != nil {
panic(err)
}
if len(cert.Certificate) == 0 {
panic(errors.New("Certificate chain is empty"))
}
return cert
}
func certHashFromRawCert(rawCert []byte) []byte {
if len(rawCert) == 0 {
return nil
}
return util.ComputeSHA256(rawCert)
}
// ExtractCertificateHash extracts the hash of the certificate from the stream
func extractCertificateHashFromContext(ctx context.Context) []byte {
pr, extracted := peer.FromContext(ctx)
if !extracted {
return nil
}
authInfo := pr.AuthInfo
if authInfo == nil {
return nil
}
tlsInfo, isTLSConn := authInfo.(credentials.TLSInfo)
if !isTLSConn {
return nil
}
certs := tlsInfo.State.PeerCertificates
if len(certs) == 0 {
return nil
}
raw := certs[0].Raw
return certHashFromRawCert(raw)
}