/
keys.go
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/
keys.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
/*
Notice: This file has been modified for Hyperledger Fabric SDK Go usage.
Please review third_party pinning scripts and patches for more details.
*/
package sw
import (
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/x509"
"encoding/asn1"
"encoding/pem"
"errors"
"fmt"
)
type pkcs8Info struct {
Version int
PrivateKeyAlgorithm []asn1.ObjectIdentifier
PrivateKey []byte
}
type ecPrivateKey struct {
Version int
PrivateKey []byte
NamedCurveOID asn1.ObjectIdentifier `asn1:"optional,explicit,tag:0"`
PublicKey asn1.BitString `asn1:"optional,explicit,tag:1"`
}
var (
oidNamedCurveP224 = asn1.ObjectIdentifier{1, 3, 132, 0, 33}
oidNamedCurveP256 = asn1.ObjectIdentifier{1, 2, 840, 10045, 3, 1, 7}
oidNamedCurveP384 = asn1.ObjectIdentifier{1, 3, 132, 0, 34}
oidNamedCurveP521 = asn1.ObjectIdentifier{1, 3, 132, 0, 35}
)
var oidPublicKeyECDSA = asn1.ObjectIdentifier{1, 2, 840, 10045, 2, 1}
func oidFromNamedCurve(curve elliptic.Curve) (asn1.ObjectIdentifier, bool) {
switch curve {
case elliptic.P224():
return oidNamedCurveP224, true
case elliptic.P256():
return oidNamedCurveP256, true
case elliptic.P384():
return oidNamedCurveP384, true
case elliptic.P521():
return oidNamedCurveP521, true
}
return nil, false
}
func privateKeyToDER(privateKey *ecdsa.PrivateKey) ([]byte, error) {
if privateKey == nil {
return nil, errors.New("invalid ecdsa private key. It must be different from nil")
}
return x509.MarshalECPrivateKey(privateKey)
}
func privateKeyToPEM(privateKey interface{}, pwd []byte) ([]byte, error) {
// Validate inputs
if len(pwd) != 0 {
return privateKeyToEncryptedPEM(privateKey, pwd)
}
if privateKey == nil {
return nil, errors.New("invalid key. It must be different from nil")
}
switch k := privateKey.(type) {
case *ecdsa.PrivateKey:
if k == nil {
return nil, errors.New("invalid ecdsa private key. It must be different from nil")
}
// get the oid for the curve
oidNamedCurve, ok := oidFromNamedCurve(k.Curve)
if !ok {
return nil, errors.New("unknown elliptic curve")
}
// based on https://golang.org/src/crypto/x509/sec1.go
privateKeyBytes := k.D.Bytes()
paddedPrivateKey := make([]byte, (k.Curve.Params().N.BitLen()+7)/8)
copy(paddedPrivateKey[len(paddedPrivateKey)-len(privateKeyBytes):], privateKeyBytes)
// omit NamedCurveOID for compatibility as it's optional
asn1Bytes, err := asn1.Marshal(ecPrivateKey{
Version: 1,
PrivateKey: paddedPrivateKey,
PublicKey: asn1.BitString{Bytes: elliptic.Marshal(k.Curve, k.X, k.Y)},
})
if err != nil {
return nil, fmt.Errorf("error marshaling EC key to asn1: [%s]", err)
}
var pkcs8Key pkcs8Info
pkcs8Key.Version = 0
pkcs8Key.PrivateKeyAlgorithm = make([]asn1.ObjectIdentifier, 2)
pkcs8Key.PrivateKeyAlgorithm[0] = oidPublicKeyECDSA
pkcs8Key.PrivateKeyAlgorithm[1] = oidNamedCurve
pkcs8Key.PrivateKey = asn1Bytes
pkcs8Bytes, err := asn1.Marshal(pkcs8Key)
if err != nil {
return nil, fmt.Errorf("error marshaling EC key to asn1: [%s]", err)
}
return pem.EncodeToMemory(
&pem.Block{
Type: "PRIVATE KEY",
Bytes: pkcs8Bytes,
},
), nil
default:
return nil, errors.New("invalid key type. It must be *ecdsa.PrivateKey")
}
}
func privateKeyToEncryptedPEM(privateKey interface{}, pwd []byte) ([]byte, error) {
if privateKey == nil {
return nil, errors.New("invalid private key. It must be different from nil")
}
switch k := privateKey.(type) {
case *ecdsa.PrivateKey:
if k == nil {
return nil, errors.New("invalid ecdsa private key. It must be different from nil")
}
raw, err := x509.MarshalECPrivateKey(k)
if err != nil {
return nil, err
}
block, err := x509.EncryptPEMBlock(
rand.Reader,
"PRIVATE KEY",
raw,
pwd,
x509.PEMCipherAES256)
if err != nil {
return nil, err
}
return pem.EncodeToMemory(block), nil
default:
return nil, errors.New("invalid key type. It must be *ecdsa.PrivateKey")
}
}
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!!!")
}
func pemToPrivateKey(raw []byte, pwd []byte) (interface{}, error) {
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 pemToAES(raw []byte, pwd []byte) ([]byte, 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)
}
if x509.IsEncryptedPEMBlock(block) {
if len(pwd) == 0 {
return nil, errors.New("encrypted Key. Password must be different fom nil")
}
decrypted, err := x509.DecryptPEMBlock(block, pwd)
if err != nil {
return nil, fmt.Errorf("failed PEM decryption: [%s]", err)
}
return decrypted, nil
}
return block.Bytes, nil
}
func aesToPEM(raw []byte) []byte {
return pem.EncodeToMemory(&pem.Block{Type: "AES PRIVATE KEY", Bytes: raw})
}
func aesToEncryptedPEM(raw []byte, pwd []byte) ([]byte, error) {
if len(raw) == 0 {
return nil, errors.New("invalid aes key. It must be different from nil")
}
if len(pwd) == 0 {
return aesToPEM(raw), nil
}
block, err := x509.EncryptPEMBlock(
rand.Reader,
"AES PRIVATE KEY",
raw,
pwd,
x509.PEMCipherAES256)
if err != nil {
return nil, err
}
return pem.EncodeToMemory(block), nil
}
func publicKeyToPEM(publicKey interface{}, pwd []byte) ([]byte, error) {
if len(pwd) != 0 {
return publicKeyToEncryptedPEM(publicKey, pwd)
}
if publicKey == nil {
return nil, errors.New("invalid public key. It must be different from nil")
}
switch k := publicKey.(type) {
case *ecdsa.PublicKey:
if k == nil {
return nil, errors.New("invalid ecdsa public key. It must be different from nil")
}
PubASN1, err := x509.MarshalPKIXPublicKey(k)
if err != nil {
return nil, err
}
return pem.EncodeToMemory(
&pem.Block{
Type: "PUBLIC KEY",
Bytes: PubASN1,
},
), nil
default:
return nil, errors.New("invalid key type. It must be *ecdsa.PublicKey")
}
}
func publicKeyToEncryptedPEM(publicKey interface{}, pwd []byte) ([]byte, error) {
switch k := publicKey.(type) {
case *ecdsa.PublicKey:
if k == nil {
return nil, errors.New("invalid ecdsa public key. It must be different from nil")
}
raw, err := x509.MarshalPKIXPublicKey(k)
if err != nil {
return nil, err
}
block, err := x509.EncryptPEMBlock(
rand.Reader,
"PUBLIC KEY",
raw,
pwd,
x509.PEMCipherAES256)
if err != nil {
return nil, err
}
return pem.EncodeToMemory(block), nil
default:
return nil, errors.New("invalid key type. It must be *ecdsa.PublicKey")
}
}
func pemToPublicKey(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. 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. Password must be different from nil")
}
decrypted, err := x509.DecryptPEMBlock(block, pwd)
if err != nil {
return nil, fmt.Errorf("failed PEM decryption: [%s]", err)
}
key, err := derToPublicKey(decrypted)
if err != nil {
return nil, err
}
return key, err
}
cert, err := derToPublicKey(block.Bytes)
if err != nil {
return nil, err
}
return cert, err
}
func derToPublicKey(raw []byte) (pub interface{}, err error) {
if len(raw) == 0 {
return nil, errors.New("invalid DER. It must be different from nil")
}
key, err := x509.ParsePKIXPublicKey(raw)
return key, err
}