/
rsa.go
78 lines (72 loc) · 1.72 KB
/
rsa.go
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package grsa
import (
"crypto/rsa"
"os"
"encoding/pem"
"crypto/x509"
"io/ioutil"
"crypto/rand"
"crypto/sha1"
"fmt"
"errors"
)
func PubSha1(key *rsa.PrivateKey) string {
if key == nil {
return "pub_key_nil"
}
hash := sha1.New()
publicKey := x509.MarshalPKCS1PublicKey(&key.PublicKey)
hash.Write(publicKey)
return fmt.Sprintf("%x", hash.Sum(nil))
}
func SaveFile(filePrefix string, key *rsa.PrivateKey) error {
prif, err := os.OpenFile(filePrefix, os.O_CREATE|os.O_RDWR, 0777)
if err != nil {
return err
}
defer prif.Close()
pubf, err := os.OpenFile(filePrefix+".pub", os.O_CREATE|os.O_RDWR, 0777)
if err != nil {
return err
}
defer pubf.Close()
if err = pem.Encode(pubf, &pem.Block{
Type: "PUBLIC KEY",
Bytes: x509.MarshalPKCS1PublicKey(&key.PublicKey),
}); err != nil {
return err
}
if err = pem.Encode(prif, &pem.Block{
Type: "PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(key),
}); err != nil {
return err
}
return nil
}
func LoadFile(filename string) (*rsa.PrivateKey, error) {
file, err := ioutil.ReadFile(filename)
if err != nil {
return nil, err
}
p, _ := pem.Decode(file)
return x509.ParsePKCS1PrivateKey(p.Bytes)
}
func RandKey() (*rsa.PrivateKey, error) {
return rsa.GenerateKey(rand.Reader, 2048)
}
func LoadPubKey(data []byte) (*rsa.PublicKey, error) {
return x509.ParsePKCS1PublicKey(data)
}
func Decode(cipherText []byte, k *rsa.PrivateKey) ([]byte, error) {
if cipherText == nil {
return nil, errors.New("cipherText is nil")
}
return rsa.DecryptPKCS1v15(rand.Reader, k, cipherText)
}
func Encode(plainText []byte, k *rsa.PublicKey) ([]byte, error) {
if plainText == nil {
return nil, errors.New("plainText is nil")
}
return rsa.EncryptPKCS1v15(rand.Reader, k, plainText)
}