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Ubify Security & Compliance Operations
CYBERSECURITY & PRIVACY AUDITORS
About This Tool
The Client-Side HMAC Authentication Code Generator calculates cryptographic Hash-Based Message Authentication Codes (HMAC) using the browser native Web Cryptography API (window.crypto.subtle). By combining a user-provided secret key with message input data, the tool imports the raw key bytes and signs the payload using standard cryptographic hash functions: HMAC-SHA256 (32-byte digest, 64-char hex), HMAC-SHA512 (64-byte digest, 128-char hex), or legacy HMAC-SHA1. Used extensively in API webhook verification, AWS signature version 4, and OAuth tokens, all key imports and signature operations execute strictly in local memory without transmitting secret keys over the internet.
How to Use
- 1
Enter or paste your authentication secret key into the Secret Key field.
- 2
Choose your cryptographic hash algorithm (SHA-256, SHA-512, or SHA-1).
- 3
Input your message payload or webhook body into the primary text editor.
- 4
Click Generate HMAC to compute the signature and copy the hexadecimal hash.
Frequently Asked Questions
Which cryptographic API powers the HMAC generation?
The tool utilizes the browser native window.crypto.subtle.importKey and crypto.subtle.sign APIs.
Is my secret signing key sent to an external server?
No. Your secret key and message payload never leave your browser sandbox; zero network calls are made.
What signature format is output by the generator?
The resulting binary signature buffer is formatted as a lowercase hexadecimal digest string.