optimized_go_tools/am_rsa/rsa.go

120 lines
2.5 KiB
Go
Raw Normal View History

2024-07-08 03:14:19 +00:00
package am_rsa
import (
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/base64"
"encoding/pem"
"errors"
)
// 工具错误类型
var (
KeyPairAlreadyExistError = errors.New("key pair already exist")
)
// KeyPair备份值
var keyPair map[string]string
/*
* 产生Keypair
* 参数
* bits int长度一般为1024或2048
*/
func GenRSAKeypair(bits int) (privateKey, publicKey string, err error) {
// 防止重复生成
if keyPair != nil {
return "", "", KeyPairAlreadyExistError
}
// 生成keypair
key, err := rsa.GenerateKey(rand.Reader, bits)
if err != nil {
return "", "", err
}
// 将私钥处理为PEM格式
pkcs1PrivateKey := x509.MarshalPKCS1PrivateKey(key)
p := &pem.Block{
Type: "PRIVATE KEY",
Bytes: pkcs1PrivateKey,
}
privKeyPEM := pem.EncodeToMemory(p)
// 将公钥处理成PEM格式
pubKeyBytes, err := x509.MarshalPKIXPublicKey(&key.PublicKey)
if err != nil {
return "", "", err
}
p = &pem.Block{
Type: "PUBLIC KEY",
Bytes: pubKeyBytes,
}
pubKeyPEM := pem.EncodeToMemory(p)
// 生成最后的PEM字串
privateKey = string(privKeyPEM)
publicKey = string(pubKeyPEM)
// 备份keypair
keyPair = map[string]string{
"private": privateKey,
"public": publicKey,
}
return
}
/*
* RSA公钥加密
* 参数
* 1. originData string要加密的明文
* 2. publicKey string公钥PEM
*/
func RsaEncryptBase64(originalData, publicKey string) (string, error) {
block, _ := pem.Decode([]byte(publicKey)) // 解密公钥
// 加载公钥
pubKey, err := x509.ParsePKIXPublicKey(block.Bytes)
if err != nil {
return "", err
}
// 使用公钥加密数据
encryptedData, err := rsa.EncryptPKCS1v15(rand.Reader, pubKey.(*rsa.PublicKey), []byte(originalData))
if err != nil {
return "", err
}
// 产生base64字串
return base64.StdEncoding.EncodeToString(encryptedData), err
}
/*
* RSA私钥解密
* 参数
* 1. encryptedData string加密过后的密文
* 2. privateKey string私钥PEM
*/
func RsaDecryptBase64(encryptedData, privateKey string) (string, error) {
// 解密私钥
encryptedDecodeBytes, err := base64.StdEncoding.DecodeString(encryptedData)
if err != nil {
return "", err
}
block, _ := pem.Decode([]byte(privateKey))
// 加载私钥
priKey, err := x509.ParsePKCS1PrivateKey(block.Bytes)
if err != nil {
return "", err
}
// 使用私钥解密
originalData, err := rsa.DecryptPKCS1v15(rand.Reader, priKey, encryptedDecodeBytes)
if err != nil {
return "", err
}
// 返回原数据
return string(originalData), nil
}