HMAC Hash & Message Authentication Code Generator
Calculate keyed-hash message authentication codes (HMAC-SHA256, SHA512, SHA384, SHA1) with Web Crypto API.
How to Use HMAC Hash & Message Authentication Code Generator
1. Enter Input or Secret Parameters
Type your message, select token length, or choose cryptographic algorithms and secret keys.
2. Local Cryptographic Processing
The native W3C Web Crypto API executes hashing, encryption, or key generation 100% locally.
3. Copy Secure Output
Copy the verified checksum, generated password, or ciphertext directly to your clipboard.
How This Utility Works
Fast, secure HMAC generator for API signatures, webhook verification, and cryptographic integrity. Supports HMAC-SHA256, HMAC-SHA384, HMAC-SHA512, and HMAC-SHA1 algorithms. Generates outputs in Hexadecimal and Base64 formats with real-time updates. 100% client side.
Hashing and cipher transformations run entirely via the standard W3C Web Cryptography API in volatile RAM. Secrets and keys never touch a cloud endpoint.
Frequently Asked Questions
What is HMAC used for?
HMAC (Hash-based Message Authentication Code) is used to verify both the data integrity and authenticity of a message between two parties who share a secret key, common in REST APIs and webhooks.
Generate HMAC-SHA256 Signatures in Shell
Run directly in your terminal without installing external heavy dependencies
$ echo -n "message_body" | openssl dgst -sha256 -hmac "secret_key"Calculates standard HMAC-SHA256 authentication code using OpenSSL.
$ python3 -c 'import hmac, hashlib, sys; print(hmac.new(b"secret_key", b"message_body", hashlib.sha256).hexdigest())'Standard Python hmac module producing hex digest signatures.
Cryptographic Hashing & Encryption Standards
| Algorithm | Output Size | Security Level | Primary Application |
|---|---|---|---|
| SHA-256 | 256 bits (64 hex chars) | NIST Approved / Highly Secure | Digital signatures, Bitcoin, TLS certificates |
| SHA-512 | 512 bits (128 hex chars) | High Security / 64-bit Optimized | High-security checksums, Unix password hashes |
| Keccak-256 | 256 bits (64 hex chars) | Ethereum Standard | Ethereum smart contracts, address generation |
| AES-GCM | 128/256-bit symmetric key | Military-Grade Authenticated Cipher | Secure data storage, confidential communications |
| BIP-39 | 12–24 Mnemonic Words | CSPRNG Entropy Standard | Deterministic cryptocurrency wallet seeds |