From f2ce003a973b2ff0d3af140c28365b05d0d7912c Mon Sep 17 00:00:00 2001
From: Ardis Lu <ardisglu@gmail.com>
Date: Thu, 6 Jul 2023 13:29:54 -0700
Subject: [PATCH] Add MD5 to hash worker

---
 README.md     |  1 +
 hash/index.js | 11 ++++++++---
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index ced9e0d..3e64430 100644
--- a/README.md
+++ b/README.md
@@ -253,6 +253,7 @@ PS> (Invoke-WebRequest https://x.y.workers.dev?algorithm=SHA-256&query=Hello%2C%
 
 Supported values are:
 
+- `MD5` (not part of the Web Crypto API but supported by Cloudflare Workers)
 - `SHA-1`
 - `SHA-256`
 - `SHA-384`
diff --git a/hash/index.js b/hash/index.js
index 78b241f..1fa697b 100644
--- a/hash/index.js
+++ b/hash/index.js
@@ -7,8 +7,13 @@ export default {
     // Parse URLSearchParams
     for (const [key, value] of url.searchParams) {
       const normalizedKey = key.toLowerCase();
-      if ((normalizedKey === 'a' || normalizedKey === 'algorithm') && /^SHA-?(1|256|384|512)$/i.test(value)) {
-        algorithm = value.includes('-') ? value : `SHA-${value.slice(3)}`; // Insert a '-' character if it's not present; crypto.subtle.digest() requires it.
+      if ((normalizedKey === 'a' || normalizedKey === 'algorithm')) {
+        if (/^SHA-?(1|256|384|512)$/i.test(value)) {
+          algorithm = value.includes('-') ? value : `SHA-${value.slice(3)}`; // Insert a '-' character if it's not present; crypto.subtle.digest() requires it.
+        }
+        else if (value.toUpperCase() === 'MD5') {
+          algorithm = 'MD5';
+        }
       }
       else if ((normalizedKey === 'q' || normalizedKey === 'query') && value) { // Intentionally fail for falsy values because a null or empty string is also invalid
         query = value;
@@ -17,7 +22,7 @@ export default {
 
     // Handling bad params
     if (algorithm === undefined) {
-      return new Response('Invalid algorithm provided. Provide one of the following values for the parameter "a" or "algorithm": SHA-1, SHA-256, SHA-384, or SHA-512.', { status: 400 });
+      return new Response('Invalid algorithm provided. Provide one of the following values for the parameter "a" or "algorithm": MD5, SHA-1, SHA-256, SHA-384, or SHA-512.', { status: 400 });
     }
     else if (query === undefined) {
       return new Response('Invalid query provided. Provide a value for the parameter "q" or "query".', { status: 400 });
-- 
2.47.3