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util.go
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util.go
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package sandpay
import (
"bytes"
"crypto"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/json"
"encoding/pem"
"errors"
"fmt"
"io/ioutil"
"path/filepath"
)
const OK = "000000"
type X map[string]string
type Data struct {
Head X `json:"head"`
Body X `json:"body"`
}
// PemBlockType pem block type which taken from the preamble.
type PemBlockType string
const (
// RSAPKCS1 private key in PKCS#1
RSAPKCS1 PemBlockType = "RSA PRIVATE KEY"
// RSAPKCS8 private key in PKCS#8
RSAPKCS8 PemBlockType = "PRIVATE KEY"
)
// PrivateKey RSA private key
type PrivateKey struct {
key *rsa.PrivateKey
}
// Decrypt rsa decrypt with PKCS #1 v1.5
func (pk *PrivateKey) Decrypt(cipherText []byte) ([]byte, error) {
return rsa.DecryptPKCS1v15(rand.Reader, pk.key, cipherText)
}
// Sign returns sha-with-rsa signature.
func (pk *PrivateKey) Sign(hash crypto.Hash, data []byte) ([]byte, error) {
if !hash.Available() {
return nil, fmt.Errorf("crypto: requested hash function (%s) is unavailable", hash.String())
}
h := hash.New()
h.Write(data)
signature, err := rsa.SignPKCS1v15(rand.Reader, pk.key, hash, h.Sum(nil))
if err != nil {
return nil, err
}
return signature, nil
}
// NewPrivateKeyFromPemFile returns new private key with pem file.
func NewPrivateKeyFromPemFile(pemFile string) (*PrivateKey, error) {
keyPath, err := filepath.Abs(pemFile)
if err != nil {
return nil, err
}
b, err := ioutil.ReadFile(keyPath)
if err != nil {
return nil, err
}
block, _ := pem.Decode(b)
if block == nil {
return nil, errors.New("no PEM data is found")
}
var pk interface{}
switch PemBlockType(block.Type) {
case RSAPKCS1:
pk, err = x509.ParsePKCS1PrivateKey(block.Bytes)
case RSAPKCS8:
pk, err = x509.ParsePKCS8PrivateKey(block.Bytes)
}
if err != nil {
return nil, err
}
return &PrivateKey{key: pk.(*rsa.PrivateKey)}, nil
}
// PublicKey RSA public key
type PublicKey struct {
key *rsa.PublicKey
}
// Encrypt rsa encrypt with PKCS #1 v1.5
func (pk *PublicKey) Encrypt(plainText []byte) ([]byte, error) {
return rsa.EncryptPKCS1v15(rand.Reader, pk.key, plainText)
}
// Verify verifies the sha-with-rsa signature.
func (pk *PublicKey) Verify(hash crypto.Hash, data, signature []byte) error {
if !hash.Available() {
return fmt.Errorf("crypto: requested hash function (%s) is unavailable", hash.String())
}
h := hash.New()
h.Write(data)
return rsa.VerifyPKCS1v15(pk.key, hash, h.Sum(nil), signature)
}
// NewPublicKeyFromDerFile returns public key with DER file.
// NOTE: PEM format with -----BEGIN CERTIFICATE----- | -----END CERTIFICATE-----
// openssl x509 -inform der -in cert.cer -out cert.pem
func NewPublicKeyFromDerFile(pemFile string) (*PublicKey, error) {
keyPath, err := filepath.Abs(pemFile)
if err != nil {
return nil, err
}
b, err := ioutil.ReadFile(keyPath)
if err != nil {
return nil, err
}
block, _ := pem.Decode(b)
if block == nil {
return nil, errors.New("no PEM data is found")
}
cert, err := x509.ParseCertificate(block.Bytes)
if err != nil {
return nil, err
}
return &PublicKey{key: cert.PublicKey.(*rsa.PublicKey)}, nil
}
// MarshalNoEscapeHTML marshal with no escape HTML
func MarshalNoEscapeHTML(v interface{}) ([]byte, error) {
buf := bytes.NewBuffer(nil)
jsonEncoder := json.NewEncoder(buf)
jsonEncoder.SetEscapeHTML(false)
if err := jsonEncoder.Encode(v); err != nil {
return nil, err
}
b := buf.Bytes()
// 去掉 go std 给末尾加的 '\n'
// @see https://github.com/golang/go/issues/7767
if l := len(b); l != 0 && b[l-1] == '\n' {
b = b[:l-1]
}
return b, nil
}