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crypt.go
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crypt.go
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// Copyright 2023 Ant Group Co., Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package tls
import (
"bytes"
"crypto"
"crypto/rand"
"crypto/rsa"
"crypto/sha256"
"crypto/x509"
"crypto/x509/pkix"
"encoding/base64"
"encoding/pem"
"fmt"
"io"
"math/big"
"net"
"os"
"time"
"github.com/google/uuid"
"github.com/secretflow/kuscia/pkg/utils/nlog"
"github.com/secretflow/kuscia/pkg/utils/paths"
)
const (
RsaPrivateKey = "RSA PRIVATE KEY"
RsaPublicKey = "RSA PUBLIC KEY"
)
func ParsePKCS1PrivateKeyData(data []byte) (*rsa.PrivateKey, error) {
block, _ := pem.Decode(data)
if block == nil || block.Type != RsaPrivateKey {
return nil, fmt.Errorf("invalid private key, should be PEM block format")
}
return x509.ParsePKCS1PrivateKey(block.Bytes)
}
func ParsePKCS1PrivateKey(serverKey string) (*rsa.PrivateKey, error) {
priPemData, err := os.ReadFile(serverKey)
if err != nil {
return nil, err
}
return ParsePKCS1PrivateKeyData(priPemData)
}
func ParsePKCS1PublicKey(der []byte) (*rsa.PublicKey, error) {
if len(der) == 0 {
return nil, fmt.Errorf("public key is empty")
}
block, _ := pem.Decode(der)
if block == nil || block.Type != RsaPublicKey {
return nil, fmt.Errorf("public key should be PEM block format")
}
return x509.ParsePKCS1PublicKey(block.Bytes)
}
func ParsePKCS1CertData(data []byte) (*x509.Certificate, error) {
certBlock, _ := pem.Decode(data)
if certBlock == nil {
return nil, fmt.Errorf("format error, must be cert")
}
return x509.ParseCertificate(certBlock.Bytes)
}
func ParsePKCS1CertFromFile(caFilePath string) (*x509.Certificate, error) {
certContent, err := os.ReadFile(caFilePath)
if err != nil {
return nil, err
}
return ParsePKCS1CertData(certContent)
}
func EncodePKCS1PublicKey(priKey *rsa.PrivateKey) []byte {
block := &pem.Block{
Type: RsaPublicKey,
Bytes: x509.MarshalPKCS1PublicKey(&priKey.PublicKey),
}
pubPem := pem.EncodeToMemory(block)
return pubPem
}
func EncryptPKCS1v15(pub *rsa.PublicKey, key []byte, prefix []byte) (string, error) {
keyToEncrypt := append(prefix, key...)
ciphertext, err := rsa.EncryptPKCS1v15(rand.Reader, pub, keyToEncrypt)
if err != nil {
return "", err
}
return base64.StdEncoding.EncodeToString(ciphertext), nil
}
func generateRandKey(keysize int) ([]byte, error) {
key := make([]byte, keysize)
if _, err := io.ReadFull(rand.Reader, key); err != nil {
return nil, err
}
return key, nil
}
func genKey(keysize int, prefix []byte) ([]byte, error) {
key, err := generateRandKey(keysize + len(prefix))
if err != nil {
return nil, err
}
if len(prefix) > 0 {
i := 0
for i < len(prefix) {
if key[i] != prefix[i] {
return key, nil
}
i++
}
return genKey(keysize, prefix)
}
return key, nil
}
func DecryptPKCS1v15(priv *rsa.PrivateKey, ciphertext string, keysize int, prefix []byte) ([]byte, error) {
key, err := genKey(keysize, prefix)
if err != nil {
return nil, err
}
text, err := base64.StdEncoding.DecodeString(ciphertext)
if err != nil {
return nil, err
}
if err := rsa.DecryptPKCS1v15SessionKey(rand.Reader, priv, text, key); err != nil {
return nil, err
}
if len(prefix) > 0 {
i := 0
for ; i < len(prefix); i++ {
if key[i] != prefix[i] {
return nil, fmt.Errorf("decrypt error, prefix not match")
}
}
return key[len(prefix):], nil
}
return key[1:], nil
}
func EncryptOAEP(pub *rsa.PublicKey, key []byte) (string, error) {
// refer: http://mpqs.free.fr/h11300-pkcs-1v2-2-rsa-cryptography-standard-wp_EMC_Corporation_Public-Key_Cryptography_Standards_(PKCS).pdf#page=18
// see length check:
// 2. If mLen > k - 2hLen - 2, output "message too long" and stop
roundLength := pub.Size() - 2*sha256.New().Size() - 2
start := 0
ciphertext := make([]byte, 0)
for start < len(key) {
end := start + roundLength
if end > len(key) {
end = len(key)
}
currentCiphertext, err := rsa.EncryptOAEP(sha256.New(), rand.Reader, pub, key[start:end], nil)
if err != nil {
return "", err
}
ciphertext = append(ciphertext, currentCiphertext...)
start = end
}
return base64.StdEncoding.EncodeToString(ciphertext), nil
}
func DecryptOAEP(priv *rsa.PrivateKey, ciphertext string) ([]byte, error) {
text, err := base64.StdEncoding.DecodeString(ciphertext)
if err != nil {
return nil, err
}
roundLength := priv.Size()
start := 0
plaintext := make([]byte, 0)
for start < len(text) {
end := start + roundLength
if end > len(text) {
end = len(text)
}
currentPlaintext, err := rsa.DecryptOAEP(sha256.New(), rand.Reader, priv, text[start:end], nil)
if err != nil {
return nil, err
}
plaintext = append(plaintext, currentPlaintext...)
start = end
}
return plaintext, nil
}
func VerifySSLKey(key []byte) bool {
block, _ := pem.Decode(key)
if block == nil {
return false
}
if block.Type == RsaPrivateKey {
if _, err := x509.ParsePKCS1PrivateKey(block.Bytes); err != nil {
return false
}
return true
}
if block.Type == "EC PRIVATE KEY" {
if _, err := x509.ParseECPrivateKey(block.Bytes); err != nil {
return false
}
return true
}
return false
}
func VerifyCert(cert []byte) bool {
block, _ := pem.Decode(cert)
if block == nil || block.Type != "CERTIFICATE" {
return false
}
if _, err := x509.ParseCertificate(block.Bytes); err != nil {
return false
}
return true
}
func VerifyEncodeCert(base64EncodeCert string) error {
data, err := base64.StdEncoding.DecodeString(base64EncodeCert)
if err != nil {
return fmt.Errorf("cert must be encoded with base64")
}
if !VerifyCert(data) {
return fmt.Errorf("cert format is invalid, must be an x509 certificate")
}
return nil
}
func ParseEncodedKey(keyDataEncoded, keyFile string) (*rsa.PrivateKey, error) {
var (
keyDataDecoded []byte
err error
key *rsa.PrivateKey
)
if keyDataEncoded != "" {
if keyDataDecoded, err = base64.StdEncoding.DecodeString(keyDataEncoded); err != nil {
nlog.Errorf("Decoded keyData error: %v", err)
return nil, err
}
key, err = ParseKey(keyDataDecoded, "")
if err != nil {
return nil, err
}
if keyFile != "" && !paths.CheckFileExist(keyFile) {
if err = WritePrivateKeyToFile(key, keyFile); err != nil {
return nil, err
}
}
return key, nil
}
return ParseKey(nil, keyFile)
}
func ParseKey(keyData []byte, keyFile string) (key *rsa.PrivateKey, err error) {
if len(keyData) == 0 && keyFile == "" {
return nil, fmt.Errorf("init key failed: should not all empty")
}
// Make key: keyData's priority is higher than keyFile
if len(keyData) != 0 {
key, err = ParsePKCS1PrivateKeyData(keyData)
if err == nil {
return key, nil
}
nlog.Errorf("load key data failed: %s, try key file", err)
}
if key == nil && keyFile != "" {
key, err = ParsePKCS1PrivateKey(keyFile)
if err == nil {
return key, nil
}
nlog.Errorf("load key file failed: %s", err)
}
return nil, fmt.Errorf("can't parse key")
}
func ParseCert(certData []byte, certFile string) (cert *x509.Certificate, err error) {
if len(certData) == 0 && certFile == "" {
return nil, fmt.Errorf("init cert failed: should not all empty")
}
// Make cert: certData's priority is higher than certFile
if len(certData) != 0 {
cert, err = ParsePKCS1CertData(certData)
if err == nil {
return cert, nil
}
nlog.Errorf("load cert data failed: %s, try cert file", err)
}
if cert == nil && certFile != "" {
cert, err = ParsePKCS1CertFromFile(certFile)
if err == nil {
return cert, nil
}
nlog.Errorf("load cert file failed: %s", err)
}
return nil, fmt.Errorf("can't parse cert")
}
func ParseCertWithGenerated(privateKey *rsa.PrivateKey, subject string, certData []byte, certFile string) (cert *x509.Certificate, err error) {
if len(certData) != 0 || (certFile != "" && paths.CheckFileExist(certFile)) {
return ParseCert(certData, certFile)
}
nlog.Infof("Generate cert with key, subject[%s]", subject)
template := &x509.Certificate{
SerialNumber: big.NewInt(1),
Subject: pkix.Name{CommonName: subject},
PublicKeyAlgorithm: x509.RSA,
SignatureAlgorithm: x509.SHA256WithRSA,
NotBefore: time.Now(),
NotAfter: time.Now().AddDate(50, 0, 0),
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth},
KeyUsage: x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
IsCA: true,
BasicConstraintsValid: true,
}
crtRaw, err := x509.CreateCertificate(rand.Reader, template, template, &privateKey.PublicKey, privateKey)
if err != nil {
nlog.Errorf("Create certificate error: %v", err)
return nil, err
}
certOut, err := os.Create(certFile)
defer certOut.Close()
if err != nil {
nlog.Errorf("Create cert file [%s] error: %v", certFile, err)
return nil, err
}
err = pem.Encode(certOut, &pem.Block{
Type: "CERTIFICATE",
Bytes: crtRaw,
})
if err != nil {
nlog.Errorf("Encode cert error: %v", err)
return nil, err
}
return x509.ParseCertificate(crtRaw)
}
func GenerateKeyCertPairData(rootCAKey *rsa.PrivateKey, rootCACert *x509.Certificate, commonName string) (string, string, error) {
var certBuf, keyBuf bytes.Buffer
var netIPs []net.IP
netIPs = append(netIPs, net.IPv4(127, 0, 0, 1))
cert := &x509.Certificate{
SerialNumber: big.NewInt(int64(uuid.New().ID())),
Subject: pkix.Name{CommonName: commonName},
IPAddresses: netIPs,
NotBefore: time.Now(),
NotAfter: time.Now().AddDate(10, 0, 0),
SubjectKeyId: []byte{1, 2, 3, 4, 6},
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
KeyUsage: x509.KeyUsageDigitalSignature,
}
err := GenerateX509KeyPair(rootCACert, rootCAKey, cert, &certBuf, &keyBuf)
if err != nil {
return "", "", err
}
return keyBuf.String(), certBuf.String(), nil
}
func LoadKeyData(keyFile string) (string, error) {
priPemData, err := os.ReadFile(keyFile)
if err != nil {
return "", err
}
block, _ := pem.Decode(priPemData)
if block == nil || block.Type != RsaPrivateKey {
return "", fmt.Errorf("invalid private key, should be PEM block format")
}
return base64.StdEncoding.EncodeToString(priPemData), nil
}
func GenerateKeyData() (string, error) {
var keyOut bytes.Buffer
key, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return "", err
}
err = pem.Encode(&keyOut, &pem.Block{
Type: RsaPrivateKey,
Bytes: x509.MarshalPKCS1PrivateKey(key),
})
return base64.StdEncoding.EncodeToString(keyOut.Bytes()), err
}
func WritePrivateKeyToFile(key *rsa.PrivateKey, filename string) error {
keyOut, err := os.Create(filename)
defer keyOut.Close()
if err != nil {
return fmt.Errorf("create key file [%s] error: %v", filename, err.Error())
}
return pem.Encode(keyOut, &pem.Block{
Type: RsaPrivateKey,
Bytes: x509.MarshalPKCS1PrivateKey(key),
})
}
func WriteX509CertToFile(cert *x509.Certificate, filename string) error {
certOut, err := os.Create(filename)
defer certOut.Close()
if err != nil {
return fmt.Errorf("create key file [%s] error: %v", filename, err.Error())
}
return pem.Encode(certOut, &pem.Block{
Type: "CERTIFICATE",
Bytes: cert.Raw,
})
}
func GeneratePrivateKeyToFile(filename string) error {
priv, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return err
}
return WritePrivateKeyToFile(priv, filename)
}
func SignWithRSA(key *rsa.PrivateKey, data string) (string, error) {
h := sha256.New()
h.Write([]byte(data))
digest := h.Sum(nil)
sigBytes, err := rsa.SignPKCS1v15(rand.Reader, key, crypto.SHA256, digest)
if err != nil {
return "", err
}
return base64.StdEncoding.EncodeToString(sigBytes), nil
}