diff a/src/java.base/share/classes/sun/security/x509/X509CertImpl.java b/src/java.base/share/classes/sun/security/x509/X509CertImpl.java
--- a/src/java.base/share/classes/sun/security/x509/X509CertImpl.java
+++ b/src/java.base/share/classes/sun/security/x509/X509CertImpl.java
@@ -1974,28 +1974,12 @@
             X509Certificate cert) {
         try {
             byte[] encCertInfo = cert.getEncoded();
             MessageDigest md = MessageDigest.getInstance(algorithm);
             byte[] digest = md.digest(encCertInfo);
-            StringBuilder sb = new StringBuilder(digest.length * 2);
-            for (int i = 0; i < digest.length; i++) {
-                byte2hex(digest[i], sb);
-            }
-            return sb.toString();
+            return Hex.encoder().encode(digest);
         } catch (NoSuchAlgorithmException | CertificateEncodingException e) {
             // ignored
         }
         return "";
     }
-
-    /**
-     * Converts a byte to hex digit and writes to the supplied builder
-     */
-    private static void byte2hex(byte b, StringBuilder buf) {
-        char[] hexChars = { '0', '1', '2', '3', '4', '5', '6', '7', '8',
-                '9', 'A', 'B', 'C', 'D', 'E', 'F' };
-        int high = ((b & 0xf0) >> 4);
-        int low = (b & 0x0f);
-        buf.append(hexChars[high])
-            .append(hexChars[low]);
-    }
 }