package RsaUtil

import (
	"crypto/rand"
	"crypto/rsa"
	"crypto/x509"
	"dsSdsf/Utils/ConfigUtil"
	"encoding/pem"
	"fmt"
	"github.com/pkg/errors"
)

/**
功能：对前端的RSA加密进行解密
作者：黄海
时间：2020-02-24
*/
func RsaDecrypt(ciphertext []byte) ([]byte, error) {
	privateKey := ConfigUtil.PrivateKey
	block, _ := pem.Decode([]byte(privateKey))
	if block == nil {
		return nil, errors.New("private key error!")
	}
	priv, err := x509.ParsePKCS1PrivateKey(block.Bytes)
	if err != nil {
		return nil, errors.Wrap(err, fmt.Sprintf("Parse private key  error:%s", err))
	}
	return rsa.DecryptPKCS1v15(rand.Reader, priv, ciphertext)
}