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helper.go
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helper.go
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package alipay
import (
"crypto"
"crypto/rsa"
"encoding/base64"
"net/url"
"sort"
"strings"
"github.com/smartwalle/crypto4go"
)
func SignRSA2(param url.Values, privateKey *rsa.PrivateKey) (string, error) {
return SignRSAx(param, privateKey, crypto.SHA256)
}
func SignRSA(param url.Values, privateKey *rsa.PrivateKey) (string, error) {
return SignRSAx(param, privateKey, crypto.SHA1)
}
func SignRSAx(param url.Values, privateKey *rsa.PrivateKey, hash crypto.Hash) (string, error) {
if param == nil {
param = make(url.Values, 0)
}
pList := make([]string, 0, 0)
for key := range param {
var value = strings.TrimSpace(param.Get(key))
if len(value) > 0 {
pList = append(pList, key+"="+value)
}
}
sort.Strings(pList)
src := strings.Join(pList, "&")
sig, err := crypto4go.RSASignWithKey([]byte(src), privateKey, hash)
if err != nil {
return "", err
}
return base64.StdEncoding.EncodeToString(sig), nil
}
func VerifySign(val url.Values, key []byte) error {
sign, err := base64.StdEncoding.DecodeString(val.Get("sign"))
if err != nil {
return err
}
signType := val.Get("sign_type")
keys := make([]string, 0, 0)
for key := range val {
if key == `sign` || key == `sign_type` || key == `alipay_cert_sn` {
continue
}
keys = append(keys, key)
}
sort.Strings(keys)
pList := make([]string, 0, 0)
for _, key := range keys {
pList = append(pList, key+"="+val.Get(key))
}
s := strings.Join(pList, "&")
if signType == `RSA` {
err = crypto4go.RSAVerify([]byte(s), sign, key, crypto.SHA1)
} else {
err = crypto4go.RSAVerify([]byte(s), sign, key, crypto.SHA256)
}
return err
}
func VerifyResponseData(data []byte, signType, sign string, key []byte) error {
signBytes, err := base64.StdEncoding.DecodeString(sign)
if err != nil {
return err
}
if signType == `RSA` {
err = crypto4go.RSAVerify(data, signBytes, key, crypto.SHA1)
} else {
err = crypto4go.RSAVerify(data, signBytes, key, crypto.SHA256)
}
return err
}