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rsa.go
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rsa.go
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// Copyright 2020 PingCAP, Inc.
//
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package crypto
import (
"crypto"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/base64"
"encoding/pem"
"net"
"github.com/pingcap/errors"
"software.sslmate.com/src/go-pkcs12"
)
// RSAKeyLength define the length of RSA keys
const RSAKeyLength = 2048
// RSAPair generate a pair of rsa keys
func RSAPair() (*RSAPrivKey, error) {
key, err := rsa.GenerateKey(rand.Reader, RSAKeyLength)
if err != nil {
return nil, err
}
return &RSAPrivKey{key}, nil
}
// RSAPubKey represents the public key of RSA
type RSAPubKey struct {
key *rsa.PublicKey
}
// Type returns the type of the key, e.g. RSA
func (k *RSAPubKey) Type() string {
return KeyTypeRSA
}
// Scheme returns the scheme of signature algorithm, e.g. rsassa-pss-sha256
func (k *RSAPubKey) Scheme() string {
return KeySchemeRSASSAPSSSHA256
}
// Key returns the raw public key
func (k *RSAPubKey) Key() crypto.PublicKey {
return k.key
}
// Serialize generate the pem format for a key
func (k *RSAPubKey) Serialize() ([]byte, error) {
asn1Bytes, err := x509.MarshalPKIXPublicKey(k.key)
if err != nil {
return nil, err
}
pemKey := &pem.Block{
Type: "PUBLIC KEY",
Bytes: asn1Bytes,
}
return pem.EncodeToMemory(pemKey), nil
}
// Deserialize generate a public key from pem format
func (k *RSAPubKey) Deserialize(key []byte) error {
block, _ := pem.Decode(key)
if block == nil {
return ErrorDeserializeKey
}
pubInterface, err := x509.ParsePKIXPublicKey(block.Bytes)
if err != nil {
return err
}
k.key = pubInterface.(*rsa.PublicKey)
return nil
}
// VerifySignature check the signature is right
func (k *RSAPubKey) VerifySignature(payload []byte, sig string) error {
if k.key == nil {
return ErrorKeyUninitialized
}
sha256 := crypto.SHA256.New()
_, err := sha256.Write(payload)
if err != nil {
return errors.AddStack(err)
}
hashed := sha256.Sum(nil)
b64decSig, err := base64.StdEncoding.DecodeString(sig)
if err != nil {
return err
}
return rsa.VerifyPSS(k.key, crypto.SHA256, hashed, b64decSig, nil)
}
// RSAPrivKey represents the private key of RSA
type RSAPrivKey struct {
key *rsa.PrivateKey
}
// Type returns the type of the key, e.g. RSA
func (k *RSAPrivKey) Type() string {
return KeyTypeRSA
}
// Scheme returns the scheme of signature algorithm, e.g. rsassa-pss-sha256
func (k *RSAPrivKey) Scheme() string {
return KeySchemeRSASSAPSSSHA256
}
// Serialize generate the pem format for a key
func (k *RSAPrivKey) Serialize() ([]byte, error) {
pemKey := &pem.Block{
Type: "PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(k.key),
}
return pem.EncodeToMemory(pemKey), nil
}
// Deserialize generate a private key from pem format
func (k *RSAPrivKey) Deserialize(key []byte) error {
block, _ := pem.Decode(key)
if block == nil {
return ErrorDeserializeKey
}
PrivKey, err := x509.ParsePKCS1PrivateKey(block.Bytes)
if err != nil {
return err
}
k.key = PrivKey
return nil
}
// Signature sign a signature with the key for payload
func (k *RSAPrivKey) Signature(payload []byte) (string, error) {
if k.key == nil {
return "", ErrorKeyUninitialized
}
sha256 := crypto.SHA256.New()
_, err := sha256.Write(payload)
if err != nil {
return "", errors.AddStack(err)
}
hashed := sha256.Sum(nil)
sig, err := rsa.SignPSS(rand.Reader, k.key, crypto.SHA256, hashed, nil)
if err != nil {
return "", err
}
return base64.StdEncoding.EncodeToString(sig), nil
}
// Public returns public key of the PrivKey
func (k *RSAPrivKey) Public() PubKey {
return &RSAPubKey{
key: &k.key.PublicKey,
}
}
// Signer returns the signer of the private key
func (k *RSAPrivKey) Signer() crypto.Signer {
return k.key
}
// Pem returns the raw private key im PEM format
func (k *RSAPrivKey) Pem() []byte {
return pem.EncodeToMemory(&pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(k.key),
})
}
// CSR generates a new CSR from given private key
func (k *RSAPrivKey) CSR(role, commonName string, hostList []string, IPList []string) ([]byte, error) {
var ipAddrList []net.IP
for _, ip := range IPList {
ipAddr := net.ParseIP(ip)
ipAddrList = append(ipAddrList, ipAddr)
}
// set CSR attributes
csrTemplate := &x509.CertificateRequest{
Subject: pkix.Name{
Organization: []string{pkixOrganization},
OrganizationalUnit: []string{pkixOrganizationalUnit, role},
CommonName: commonName,
},
DNSNames: hostList,
IPAddresses: ipAddrList,
}
csr, err := x509.CreateCertificateRequest(rand.Reader, csrTemplate, k.key)
if err != nil {
return nil, err
}
return csr, nil
}
// PKCS12 encodes the private and certificate to a PKCS#12 pfxData
func (k *RSAPrivKey) PKCS12(cert *x509.Certificate, ca *CertificateAuthority) ([]byte, error) {
return pkcs12.Encode(
rand.Reader,
k.key,
cert,
[]*x509.Certificate{ca.Cert},
PKCS12Password,
)
}