diff --git a/internal/ssl/ocsp.go b/internal/ssl/ocsp.go
index 39fa3d5..50e80d0 100644
--- a/internal/ssl/ocsp.go
+++ b/internal/ssl/ocsp.go
@@ -25,7 +25,6 @@ import (
 	"bytes"
 	"crypto"
 	"crypto/x509"
-	"encoding/pem"
 	"errors"
 	"fmt"
 	"io"
@@ -479,36 +478,4 @@ func (m *OCSPManager) GetStatus(serial string) (status OCSPStatus, hasResponse b
 	return resp.status, len(resp.response) > 0
 }
 
-// extractCertificates 解析 PEM 数据并返回证书列表。
-//
-// 参数：
-//   - pemData: PEM 编码的证书数据
-//
-// 返回值：
-//   - []*x509.Certificate: 解析后的证书列表
-//   - error: 解析失败时返回错误
-func extractCertificates(pemData []byte) ([]*x509.Certificate, error) {
-	var certs []*x509.Certificate
-	rest := pemData
 
-	for {
-		block, remaining := pem.Decode(rest)
-		if block == nil {
-			break
-		}
-		if block.Type == "CERTIFICATE" {
-			cert, err := x509.ParseCertificate(block.Bytes)
-			if err != nil {
-				return nil, fmt.Errorf("failed to parse certificate: %w", err)
-			}
-			certs = append(certs, cert)
-		}
-		rest = remaining
-	}
-
-	if len(certs) == 0 {
-		return nil, errors.New("no certificates found in PEM data")
-	}
-
-	return certs, nil
-}
diff --git a/internal/ssl/ocsp_test.go b/internal/ssl/ocsp_test.go
index 86b8370..b0bd7c5 100644
--- a/internal/ssl/ocsp_test.go
+++ b/internal/ssl/ocsp_test.go
@@ -308,32 +308,6 @@ func TestTLSManagerClose(t *testing.T) {
 	manager.Close()
 }
 
-func TestExtractCertificates(t *testing.T) {
-	// Create valid PEM data
-	certPEM, _ := generateTestCertWithOCSP(t, nil)
-
-	certs, err := extractCertificates(certPEM)
-	if err != nil {
-		t.Fatalf("extractCertificates() failed: %v", err)
-	}
-
-	if len(certs) == 0 {
-		t.Error("Expected at least one certificate")
-	}
-}
-
-func TestExtractCertificatesInvalidPEM(t *testing.T) {
-	invalidPEM := []byte("not valid pem data")
-
-	certs, err := extractCertificates(invalidPEM)
-	if err == nil {
-		t.Error("Expected error for invalid PEM data")
-	}
-	if certs != nil {
-		t.Error("Expected nil certs for invalid PEM data")
-	}
-}
-
 func TestOCSPManagerRegisterCertificate(t *testing.T) {
 	mgr := NewOCSPManager(nil)
 	defer mgr.Stop()