refactor: extend huaweicloud cdn sdk

internal/pkg/utils/x509/converter.go

@@ -0,0 +1,31 @@
+package x509
+
+import (
+	"crypto/ecdsa"
+	"crypto/x509"
+	"encoding/pem"
+
+	xerrors "github.com/pkg/errors"
+)
+
+// 将 ecdsa.PrivateKey 对象转换为 PEM 编码的字符串。
+//
+// 入参:
+//   - privkey: ecdsa.PrivateKey 对象。
+//
+// 出参:
+//   - privkeyPem: 私钥 PEM 内容。
+//   - err: 错误。
+func ConvertECPrivateKeyToPEM(privkey *ecdsa.PrivateKey) (privkeyPem string, err error) {
+	data, err := x509.MarshalECPrivateKey(privkey)
+	if err != nil {
+		return "", xerrors.Wrap(err, "failed to marshal EC private key")
+	}
+
+	block := &pem.Block{
+		Type:  "EC PRIVATE KEY",
+		Bytes: data,
+	}
+
+	return string(pem.EncodeToMemory(block)), nil
+}