108 lines
2.7 KiB
Go
108 lines
2.7 KiB
Go
package utils
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import (
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"crypto"
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"crypto/rand"
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"crypto/rsa"
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"crypto/sha256"
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"crypto/x509"
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"encoding/base64"
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"encoding/pem"
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"errors"
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"fmt"
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"gitea.cdlsxd.cn/sdk/plugin/alipay"
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"gitea.cdlsxd.cn/sdk/plugin/utils"
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"net/url"
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"strings"
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)
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func UrlValues(prk string, req alipay.Req) (url.Values, error) {
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if err := req.Validate(); err != nil {
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return nil, err
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}
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var strToBeSigned strings.Builder
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uv := url.Values{}
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kvRows := utils.SortStructJsonTag(req)
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for _, kv := range kvRows {
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if kv.Key == "sign" || kv.Value == "" {
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continue
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}
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uv.Set(kv.Key, kv.Value)
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strToBeSigned.WriteString(fmt.Sprintf("%s=%s&", kv.Key, kv.Value))
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}
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s := strings.TrimRight(strToBeSigned.String(), "&")
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sign, err := Sign(s, []byte(utils.NewPrivate().Build(prk)))
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if err != nil {
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return nil, err
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}
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uv.Set("sign", sign)
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return uv, nil
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}
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func Sign(data string, privateKeyPEM []byte) (string, error) {
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block, _ := pem.Decode(privateKeyPEM)
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if block == nil {
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return "", errors.New("failed to parse PEM block containing the private key")
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}
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privyKey, err := x509.ParsePKCS8PrivateKey(block.Bytes)
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if err != nil {
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return "", fmt.Errorf("failed to parse DER encoded private key: %v", err)
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}
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hashed := sha256.Sum256([]byte(data))
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signature, err := rsa.SignPKCS1v15(rand.Reader, privyKey.(*rsa.PrivateKey), crypto.SHA256, hashed[:])
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if err != nil {
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return "", fmt.Errorf("failed to sign: %v", err)
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}
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return base64.StdEncoding.EncodeToString(signature), nil
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}
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func Verify(n *alipay.Notify, publicKeyPEM string) (bool, error) {
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var strToBeSigned strings.Builder
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uv := url.Values{}
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kvRows := utils.SortStructJsonTag(n)
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for _, kv := range kvRows {
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if kv.Key == "sign" || kv.Key == "sign_type" || kv.Value == "" {
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continue
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}
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uv.Set(kv.Key, kv.Value)
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strToBeSigned.WriteString(fmt.Sprintf("%s=%s&", kv.Key, kv.Value))
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}
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s := strings.TrimRight(strToBeSigned.String(), "&")
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return check(s, n.Sign, []byte(publicKeyPEM))
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}
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func check(data, signature string, publicKeyPEM []byte) (bool, error) {
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block, _ := pem.Decode(publicKeyPEM)
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if block == nil {
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return false, fmt.Errorf("failed to parse DER encoded public key")
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}
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pubKey, err := x509.ParsePKIXPublicKey(block.Bytes)
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if err != nil {
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return false, fmt.Errorf("failed to parse DER encoded public key: %v", err)
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}
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rsaPubKey, ok := pubKey.(*rsa.PublicKey)
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if !ok {
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return false, fmt.Errorf("failed to parse DER encoded public key: %v", err)
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}
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hashed := sha256.Sum256([]byte(data))
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sig, err := base64.StdEncoding.DecodeString(signature)
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if err != nil {
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return false, fmt.Errorf("failed to decode signature: %v", err)
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}
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err = rsa.VerifyPKCS1v15(rsaPubKey, crypto.SHA256, hashed[:], sig)
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if err != nil {
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fmt.Println("signature verification error:", err)
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return false, nil
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}
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return true, nil
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}
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