1）創建私鑰：

openssl genrsa -out PRivate.pem 1024 //密鑰長度，1024覺得不夠安全的話可以用2048，但是代價也相應增大

2）創建公鑰：

openssl rsa -in private.pem -pubout -out public.pem

publicKey <--- public.pemprivateKey <--- private.pem

// 加密func RsaEncrypt(origData []byte) ([]byte, error) {	block, _ := pem.Decode(publicKey)	if block == nil {		return nil, errors.New("public key error")	}	pubInterface, err := x509.ParsePKIXPublicKey(block.Bytes)	if err != nil {		return nil, err	}	pub := pubInterface.(*rsa.PublicKey)	return rsa.EncryptPKCS1v15(rand.Reader, pub, origData)}
// 解密func RsaDecrypt(ciphertext []byte) ([]byte, error) {	block, _ := pem.Decode(privateKey)	if block == nil {		return nil, errors.New("private key error!")	}	priv, err := x509.ParsePKCS1PrivateKey(block.Bytes)	if err != nil {		return nil, err	}	return rsa.DecryptPKCS1v15(rand.Reader, priv, ciphertext)}