crypto: refactor randomUUIDv7() to use serializeUUID for improved readability

Author: nabeel378

lib/internal/crypto/random.js

@@ -430,10 +430,8 @@ function randomUUIDv7() {
   if (uuidV7Buffer === undefined)
     throw new ERR_OPERATION_FAILED('Out of memory');
 
-  // Fill all 16 bytes with random data first.
   randomFillSync(uuidV7Buffer);
 
-  // Write 48-bit timestamp (ms since Unix epoch) into bytes 0-5, big-endian.
   const now = DateNow();
   uuidV7Buffer[0] = (now / 0x10000000000) & 0xff;
   uuidV7Buffer[1] = (now / 0x100000000) & 0xff;
@@ -442,34 +440,13 @@ function randomUUIDv7() {
   uuidV7Buffer[4] = (now / 0x100) & 0xff;
   uuidV7Buffer[5] = now & 0xff;
 
-  // Set version (7) in byte 6 high nibble, keep rand_a in low nibble.
   uuidV7Buffer[6] = (uuidV7Buffer[6] & 0x0f) | 0x70;
 
-  // Set variant (0b10) in byte 8 high 2 bits, keep rand_b in low 6 bits.
   uuidV7Buffer[8] = (uuidV7Buffer[8] & 0x3f) | 0x80;
-
-  const kHexBytes = getHexBytes();
-  return kHexBytes[uuidV7Buffer[0]] +
-    kHexBytes[uuidV7Buffer[1]] +
-    kHexBytes[uuidV7Buffer[2]] +
-    kHexBytes[uuidV7Buffer[3]] +
-    '-' +
-    kHexBytes[uuidV7Buffer[4]] +
-    kHexBytes[uuidV7Buffer[5]] +
-    '-' +
-    kHexBytes[uuidV7Buffer[6]] +
-    kHexBytes[uuidV7Buffer[7]] +
-    '-' +
-    kHexBytes[uuidV7Buffer[8]] +
-    kHexBytes[uuidV7Buffer[9]] +
-    '-' +
-    kHexBytes[uuidV7Buffer[10]] +
-    kHexBytes[uuidV7Buffer[11]] +
-    kHexBytes[uuidV7Buffer[12]] +
-    kHexBytes[uuidV7Buffer[13]] +
-    kHexBytes[uuidV7Buffer[14]] +
-    kHexBytes[uuidV7Buffer[15]];
-}
+  
+  const result = serializeUUID(uuidV7Buffer);
+  return result;
+}   
 
 function createRandomPrimeJob(type, size, options) {
   validateObject(options, 'options');