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rsa_oaep.go
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rsa_oaep.go
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package support
import (
"crypto/rand"
"crypto/rsa"
"crypto/sha1"
"crypto/x509"
"encoding/pem"
"fmt"
"hash"
"io/ioutil"
)
type RSAOaep struct {
PublicKeyPath string // RSA公钥路径,会自动读取出*rsa.PrivateKey
PublicKey *rsa.PublicKey
PrivateKeyPath string
PrivateKey *rsa.PrivateKey
}
func (r *RSAOaep) EncryptOAEP(text []byte) ([]byte, error) {
if r.PublicKey == nil && r.PublicKeyPath == "" {
return nil, fmt.Errorf("you must set publickey to use EncryptOAEP")
}
// Parsing the certificate inside the PrivateKeyPath
// 读取PublicKeyPath里面的证书
if r.PublicKey == nil {
publicKey, err := r.getPublicKey()
if err != nil {
return nil, err
}
r.PublicKey = publicKey
}
rng := rand.Reader
cipherData, err := rsa.EncryptOAEP(sha1.New(), rng, r.PublicKey, text, nil)
if err != nil {
return cipherData, err
}
return cipherData, nil
}
func (r *RSAOaep) DecryptOAEP(hash hash.Hash,cipherMsg []byte) ([]byte, error) {
if r.PrivateKey == nil && r.PrivateKeyPath == "" {
return nil, fmt.Errorf("you must set privatekey to use EncryptOAEP")
}
// Parsing the certificate inside the PrivateKeyPath
// 读取PrivateKeyPath里面的证书
if r.PrivateKey == nil {
privateKey, err := r.getPrivateKey()
if err != nil {
return nil, err
}
r.PrivateKey = privateKey
}
decryptedData, decryptErr := rsa.DecryptOAEP(hash, rand.Reader, r.PrivateKey, cipherMsg, nil)
if decryptErr != nil {
fmt.Println("Decrypt data error")
return nil, decryptErr
}
return decryptedData, nil
}
func (r *RSAOaep) getPublicKey() (*rsa.PublicKey, error) {
keyStr, err := ioutil.ReadFile(r.PublicKeyPath)
if err != nil {
return nil, err
}
publicPem, _ := pem.Decode(keyStr)
publicPemBytes := publicPem.Bytes
var parsedKey interface{}
if parsedKey, err = x509.ParsePKIXPublicKey(publicPemBytes); err != nil {
// note this returns type `interface{}`
return nil, err
}
publicKey, ok := parsedKey.(*rsa.PublicKey)
if !ok {
return nil, fmt.Errorf("%s is not rsa public key", r.PublicKeyPath)
}
return publicKey, err
}
func (r *RSAOaep) getPrivateKey() (*rsa.PrivateKey, error) {
keyStr, err := ioutil.ReadFile(r.PrivateKeyPath)
if err != nil {
return nil, err
}
privPem, _ := pem.Decode(keyStr)
privPemBytes := privPem.Bytes
var parsedKey interface{}
if parsedKey, err = x509.ParsePKCS1PrivateKey(privPemBytes); err != nil { // note this returns type `interface{}`
return nil, err
}
privateKey, ok := parsedKey.(*rsa.PrivateKey)
if !ok {
return nil, fmt.Errorf("%s is not rsa private key", r.PrivateKeyPath)
}
return privateKey, err
}