增加vendor

vendor/github.com/go-pay/gopay/pkg/xpem/decode.go

@@ -0,0 +1,64 @@
+package xpem
+
+import (
+	"crypto/rsa"
+	"crypto/x509"
+	"encoding/pem"
+	"fmt"
+)
+
+func DecodePublicKey(pemContent []byte) (publicKey *rsa.PublicKey, err error) {
+	block, _ := pem.Decode(pemContent)
+	if block == nil {
+		return nil, fmt.Errorf("pem.Decode(%s)：pemContent decode error", pemContent)
+	}
+	switch block.Type {
+	case "CERTIFICATE":
+		pubKeyCert, err := x509.ParseCertificate(block.Bytes)
+		if err != nil {
+			return nil, fmt.Errorf("x509.ParseCertificate(%s)：%w", pemContent, err)
+		}
+		pubKey, ok := pubKeyCert.PublicKey.(*rsa.PublicKey)
+		if !ok {
+			return nil, fmt.Errorf("公钥证书提取公钥出错 [%s]", pemContent)
+		}
+		publicKey = pubKey
+	case "PUBLIC KEY":
+		pub, err := x509.ParsePKIXPublicKey(block.Bytes)
+		if err != nil {
+			return nil, fmt.Errorf("x509.ParsePKIXPublicKey(%s),err:%w", pemContent, err)
+		}
+		pubKey, ok := pub.(*rsa.PublicKey)
+		if !ok {
+			return nil, fmt.Errorf("公钥解析出错 [%s]", pemContent)
+		}
+		publicKey = pubKey
+	case "RSA PUBLIC KEY":
+		pubKey, err := x509.ParsePKCS1PublicKey(block.Bytes)
+		if err != nil {
+			return nil, fmt.Errorf("x509.ParsePKCS1PublicKey(%s)：%w", pemContent, err)
+		}
+		publicKey = pubKey
+	}
+	return publicKey, nil
+}
+
+func DecodePrivateKey(pemContent []byte) (privateKey *rsa.PrivateKey, err error) {
+	block, _ := pem.Decode(pemContent)
+	if block == nil {
+		return nil, fmt.Errorf("pem.Decode(%s)：pemContent decode error", pemContent)
+	}
+	privateKey, err = x509.ParsePKCS1PrivateKey(block.Bytes)
+	if err != nil {
+		pk8, err := x509.ParsePKCS8PrivateKey(block.Bytes)
+		if err != nil {
+			return nil, fmt.Errorf("私钥解析出错 [%s]", pemContent)
+		}
+		var ok bool
+		privateKey, ok = pk8.(*rsa.PrivateKey)
+		if !ok {
+			return nil, fmt.Errorf("私钥解析出错 [%s]", pemContent)
+		}
+	}
+	return privateKey, nil
+}