About HMAC Generator
Keyed-Hash Message Authentication Codes (HMAC) are a mechanism for message authentication using cryptographic hash functions.
Input: binary bytes (text input uses UTF-8; a file retains its original bytes). Output: text.
Format reference: HMAC background and specification
Example
Use “Try example” to load this public sample and its settings, then run it.
Settings used in this example
| Parameter | Example value | Input and choices |
|---|---|---|
| Key | {"option":"Hex","string":"0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b"} | Key/text encoding: Hex, Decimal, Base64, UTF8, Latin1 |
| Hashing function | SHA224 | Text20 Available choices
|
Sample keys and passwords are public. Never use them to protect real data.
Input
Hi There
Result
896fb1128abbdf196832107cd49df33f47b4b1169912ba4f53684b22
Parameters
| Parameter | Default value | Input and choices |
|---|---|---|
| Key | {"option":"Hex","string":""} | Key/text encoding: Hex, Decimal, Base64, UTF8, Latin1 |
| Hashing function | MD2 | Text20 Available choices
|
Before interpreting the result
Use a checksum to compare exact bytes against a trusted digest. Choose a password hashing function for passwords and a MAC for keyed authentication. MD5 and SHA-1 are unsuitable for new security-sensitive designs.
How to use this page
- Paste your input or open a local file.
- Adjust tool options if needed, then choose Run tool.
- Copy the result or download the original output bytes.
Inputs and results are not added to the public catalogue or saved in the URL. Processing happens in your browser; HTTP Request and DNS over HTTPS send the requests you explicitly run. Files up to 128 MiB can be opened; decompression and image tools may have smaller processing limits. Large results have a shortened preview. Text and HTML downloads use UTF-8; binary downloads preserve output bytes. Pasted text follows browser newline handling; open a file when exact input bytes matter.