hotime/vendor/github.com/silenceper/wechat/v2/util/rsa.go

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2022-05-24 05:49:25 +00:00
package util
import (
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/base64"
"encoding/pem"
"errors"
"fmt"
)
// RSADecrypt 数据解密
func RSADecrypt(privateKey string, ciphertext []byte) ([]byte, error) {
block, _ := pem.Decode([]byte(privateKey))
if block == nil {
return nil, errors.New("PrivateKey format error")
}
priv, err := x509.ParsePKCS1PrivateKey(block.Bytes)
if err != nil {
oldErr := err
key, err := x509.ParsePKCS8PrivateKey(block.Bytes)
if err != nil {
return nil, fmt.Errorf("ParsePKCS1PrivateKey error: %s, ParsePKCS8PrivateKey error: %s", oldErr.Error(), err.Error())
}
switch t := key.(type) {
case *rsa.PrivateKey:
priv = key.(*rsa.PrivateKey)
default:
return nil, fmt.Errorf("ParsePKCS1PrivateKey error: %s, ParsePKCS8PrivateKey error: Not supported privatekey format, should be *rsa.PrivateKey, got %T", oldErr.Error(), t)
}
}
return rsa.DecryptPKCS1v15(rand.Reader, priv, ciphertext)
}
// RSADecryptBase64 Base64解码后再次进行RSA解密
func RSADecryptBase64(privateKey string, cryptoText string) ([]byte, error) {
encryptedData, err := base64.StdEncoding.DecodeString(cryptoText)
if err != nil {
return nil, err
}
return RSADecrypt(privateKey, encryptedData)
}