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tape.go
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tape.go
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// TODO tape.go was utils copied from tape project, now we can write our own powered by goutil
package golang
import (
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/sha256"
"crypto/x509"
"encoding/asn1"
"encoding/pem"
"fmt"
"github.com/davidkhala/goutils"
util_crypto "github.com/davidkhala/goutils/crypto"
"github.com/davidkhala/protoutil/common/crypto"
"github.com/hyperledger/fabric-gateway/pkg/hash"
"github.com/hyperledger/fabric-protos-go-apiv2/common"
"github.com/pkg/errors"
"math/big"
"os"
)
type Node struct {
Addr string
TLSCACert string
TLSCAKey string
TLSCARoot string
TLSCACertByte []byte
TLSCAKeyByte []byte
TLSCARootByte []byte
SslTargetNameOverride string `json:"ssl-target-name-override"`
}
// DERToPrivateKey unmarshal a der to private key
func DERToPrivateKey(der []byte) (key interface{}, err error) {
if key, err = x509.ParsePKCS1PrivateKey(der); err == nil {
return key, nil
}
if key, err = x509.ParsePKCS8PrivateKey(der); err == nil {
switch key.(type) {
case *ecdsa.PrivateKey:
return
default:
return nil, errors.New("Found unknown private key type in PKCS#8 wrapping")
}
}
if key, err = x509.ParseECPrivateKey(der); err == nil {
return
}
return nil, errors.New("Invalid key type. The DER must contain an ecdsa.PrivateKey")
}
// PEMtoPrivateKey unmarshal a pem to private key
func PEMtoPrivateKey(raw []byte, pwd []byte) (interface{}, error) {
if len(raw) == 0 {
return nil, errors.New("Invalid PEM. It must be different from nil.")
}
block, _ := pem.Decode(raw)
if block == nil {
return nil, fmt.Errorf("Failed decoding PEM. Block must be different from nil. [% x]", raw)
}
// TODO: derive from header the type of the key
if x509.IsEncryptedPEMBlock(block) {
if len(pwd) == 0 {
return nil, errors.New("Encrypted Key. Need a password")
}
decrypted, err := x509.DecryptPEMBlock(block, pwd)
if err != nil {
return nil, fmt.Errorf("Failed PEM decryption [%s]", err)
}
key, err := DERToPrivateKey(decrypted)
if err != nil {
return nil, err
}
return key, err
}
cert, err := DERToPrivateKey(block.Bytes)
if err != nil {
return nil, err
}
return cert, err
}
func GetPrivateKey(f string) (*ecdsa.PrivateKey, error) {
in, err := os.ReadFile(f)
if err != nil {
return nil, err
}
k, err := PEMtoPrivateKey(in, []byte{})
if err != nil {
return nil, err
}
key, ok := k.(*ecdsa.PrivateKey)
if !ok {
return nil, errors.Errorf("expecting ecdsa key")
}
return key, nil
}
type CryptoConfig struct {
MSPID string
PrivKey string
SignCert string
TLSCACerts []string
// TODO to cater ClientTlsCertHash
}
func (c CryptoConfig) GetCertificate() (*x509.Certificate, []byte) {
in, err := os.ReadFile(c.SignCert)
goutils.PanicError(err)
return util_crypto.ParseCertPemOrPanic(in), in
}
type Crypto struct {
Creator []byte
PrivKey *ecdsa.PrivateKey
SignCert *x509.Certificate
digest hash.Hash
mspID string // cached as part of Creator
certificate []byte // cached as part of Creator
}
func (c Crypto) MspID() string { return c.mspID }
func (c Crypto) Credentials() []byte { return c.certificate }
func (c *Crypto) SetDefaultDigest() {
c.digest = func(in []byte) []byte {
h := sha256.New()
h.Write(in)
return h.Sum(nil)
}
}
func (c *Crypto) SetGatewayMode() {
c.digest = func(bytes []byte) []byte {
return bytes
}
}
func (c *Crypto) SetDigest(digestFunc hash.Hash) {
c.digest = digestFunc
}
func (c Crypto) Digest(message []byte) []byte {
return c.digest(message)
}
func (c Crypto) Sign(message []byte) ([]byte, error) {
ri, si, err := ecdsa.Sign(rand.Reader, c.PrivKey, c.digest(message))
if err != nil {
return nil, err
}
si, _, err = ToLowS(&c.PrivKey.PublicKey, si)
if err != nil {
return nil, err
}
return asn1.Marshal(ECDSASignature{ri, si})
}
func (c Crypto) Serialize() ([]byte, error) {
return c.Creator, nil
}
func (c Crypto) NewSignatureHeader() (*common.SignatureHeader, error) {
creator, err := c.Serialize()
if err != nil {
return nil, err
}
nonce, err := crypto.GetRandomNonce()
if err != nil {
return nil, err
}
return &common.SignatureHeader{
Creator: creator,
Nonce: nonce,
}, nil
}
type ECDSASignature struct {
R, S *big.Int
}
var (
// CurveHalfOrders contains the precomputed curve group orders halved.
// It is used to ensure that signature' S value is lower or equal to the
// curve group order halved. We accept only low-S signatures.
// They are precomputed for efficiency reasons.
CurveHalfOrders = map[elliptic.Curve]*big.Int{
elliptic.P224(): new(big.Int).Rsh(elliptic.P224().Params().N, 1),
elliptic.P256(): new(big.Int).Rsh(elliptic.P256().Params().N, 1),
elliptic.P384(): new(big.Int).Rsh(elliptic.P384().Params().N, 1),
elliptic.P521(): new(big.Int).Rsh(elliptic.P521().Params().N, 1),
}
)
func IsLowS(k *ecdsa.PublicKey, s *big.Int) (bool, error) {
halfOrder, ok := CurveHalfOrders[k.Curve]
if !ok {
return false, fmt.Errorf("curve not recognized [%s]", k.Curve)
}
return s.Cmp(halfOrder) != 1, nil
}
func ToLowS(k *ecdsa.PublicKey, s *big.Int) (*big.Int, bool, error) {
lowS, err := IsLowS(k, s)
if err != nil {
return nil, false, err
}
if !lowS {
// Set s to N - s that will be then in the lower part of signature space
// less or equal to half order
s.Sub(k.Params().N, s)
return s, true, nil
}
return s, false, nil
}