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HMAC signer
Crypto and hashing
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About this tool
Compute a keyed HMAC for UTF-8 text.
Common uses
- Compute a keyed HMAC for UTF-8 text.
- Enter the message and a nonempty text secret, then choose SHA-1, SHA-256, SHA-384 or SHA-512.
How to use it
- 1.Enter the message and a nonempty text secret, then choose SHA-1, SHA-256, SHA-384 or SHA-512.
- 2.Select hexadecimal or Base64 output and copy the generated MAC.
Limits and notes
- The secret is encoded as UTF-8 text, not decoded from hex/Base64. Requires browser Web Crypto; this tool computes a MAC rather than encrypting the message.
Frequently asked questions
What does this tool do?
Compute a keyed HMAC for UTF-8 text.
What should I check before using the result?
The secret is encoded as UTF-8 text, not decoded from hex/Base64. Requires browser Web Crypto; this tool computes a MAC rather than encrypting the message.