HMAC Generator

Generate HMAC (Hash-based Message Authentication Code) for data integrity and authentication

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Data Input

Message/Data to Authenticate Enter the data you want to authenticate

Secret Key

Secret Key Keep your secret key secure and private

HMAC Options

Output Format Choose the output format for HMAC values

Hash Algorithms

MD5 (128-bit) (Legacy)

SHA-1 (160-bit) (Legacy)

SHA-256 (256-bit) (SHA-2)

SHA-512 (512-bit) (SHA-2)

SHA-3-256 (256-bit) (SHA-3)

SHA-3-512 (512-bit) (SHA-3)

BLAKE2b (512-bit) (BLAKE2)

BLAKE2s (256-bit) (BLAKE2)

Whirlpool (512-bit) (Other)

RIPEMD-160 (160-bit) (Other)

Tiger (192-bit) (Other)

Snefru (256-bit) (Other)

GOST (256-bit) (Other)

HMAC Information

What is HMAC?

Hash-based Message Authentication Code
Provides data integrity and authentication
Uses a secret key for verification
Prevents tampering and forgery

How HMAC Works

Combines message with secret key
Applies hash function to the combination
Produces fixed-length authentication code
Verification requires the same secret key

Security Benefits

Data integrity verification
Authentication of message source
Protection against tampering
Widely used in APIs and protocols

HMAC Security Tips

Secret Key Management

Use strong, random secret keys
Keep keys secure and private
Rotate keys regularly
Never share keys in plain text

Best Practices

Use SHA-256 or SHA-512 for security
Include timestamp in messages
Verify HMAC before processing data
Use HTTPS for key transmission

Common Mistakes

Using weak hash functions
Sharing secret keys
Not verifying HMAC
Using predictable keys