HMAC SHA-1
HMAC SHA-1 keyed hash.
How to use HMAC SHA-1
HMAC SHA-1 — Compute HMAC-SHA1 and print 40 lowercase hex characters. Free to use in D2i DevTools — no account required.
Steps
- Fill in Message. This field is required.
- Fill in Secret key. This field is required.
- Click Run and copy the result under the form.
Frequently asked questions
What is HMAC SHA-1 used for?
Use it to debug older signatures (some OAuth 1.0 and legacy webhooks). New work should use HMAC-SHA-256.
How do I use the free online HMAC SHA-1 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 SHA-1?
Enter the message and the secret as UTF-8 text.
What output does HMAC SHA-1 give me?
40 hex characters. The signature is not Base64 on this page.
Is HMAC SHA-1 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.
My provider shows a Base64 HMAC. Why does it differ?
This page prints hex. Decode their Base64 and compare the bytes, or hex-encode their signature before you compare.
Inputs are processed in memory only and are not saved to disk or the database. Data exists only for the duration of your request.