Hashing

HMAC MD5

HMAC MD5 keyed hash.

How to use HMAC MD5

HMAC MD5 — Compute HMAC-MD5 of a message with a secret key and print lowercase hex. MD5 HMACs are legacy. Free to use in D2i DevTools — no account required.

Steps

  1. Fill in Message. This field is required.
  2. Fill in Secret key. This field is required.
  3. Click Run and copy the result under the form.

Frequently asked questions

What is HMAC MD5 used for?

Use it only to match an old API signature. Prefer HMAC SHA-256 for new designs.

How do I use the free online HMAC MD5 tool?

Fill in Message. This field is required. Fill in Secret key. This field is required. Click Run and copy the result under the form.

What can I paste or upload into HMAC MD5?

Enter the message and the secret key as text. Both are taken as UTF-8 bytes, not as hex.

What output does HMAC MD5 give me?

32 hex characters. A different key or message changes the result. The key is not stored.

Is HMAC MD5 free, and is my input private?

Yes — Your input is processed in memory for this request only. It is not saved to disk or the database, and it is cleared after the tool finishes.

Should the key be hex?

Type the key as characters. If your spec gives a hex key, decode it to bytes first and paste those bytes, or the HMAC will not match.

Inputs are processed in memory only and are not saved to disk or the database. Data exists only for the duration of your request.